diff --git a/config.lock.yaml b/config.lock.yaml
index a84c1ac..1e89416 100644
--- a/config.lock.yaml
+++ b/config.lock.yaml
@@ -1,6 +1,7 @@
 adaptive_number: ea9178fdd4d82ac45cf0ec966ac870dae661124f
 dots_indicator: 508f5883ac79bdbc10254092de3f28f571d261cd
 ed25519_edwards: 7353ba759ea9f4646cbf481c2ef949625c8ce4cf
+exif: bf170d5639f0b6fcb0947060cf8bd7b623df9069
 flutter_markdown_plus: dc1185c933fbf9dba559ef6c91586ff1503be3ee
 flutter_sharing_intent: aa1672f547d6579585fa27df0b28ffa2a2544aaa
 hand_signature: 1beedb164d093643365b0832277c377353c7464f
@@ -18,4 +19,5 @@ qr: 7b1e9665ca976f484e7975356cf26fc7a0ccf02e
 qr_flutter: d5e7206396105d643113618290bbcc755d05f492
 restart_app: 66897cb67e235bab85421647bfae036acb4438cb
 screen_protector: 019c04d622d7b610d2903d3a347edc3ba76a6ed0
+sprintf: f1e74f2f4c339d983f9d011b4ba1df4ec8b8857c
 x25519: ecb1d357714537bba6e276ef45f093846d4beaee
diff --git a/config.yaml b/config.yaml
index 6461cd8..58aeb21 100644
--- a/config.yaml
+++ b/config.yaml
@@ -59,4 +59,11 @@ screen_protector:
 
 
 flutter_markdown_plus:
-  git: https://github.com/foresightmobile/flutter_markdown_plus.git
\ No newline at end of file
+  git: https://github.com/foresightmobile/flutter_markdown_plus.git
+
+
+exif:
+  git: https://github.com/bigflood/dartexif.git
+  dependencies:
+    sprintf:
+      git: https://github.com/Naddiseo/dart-sprintf.git
\ No newline at end of file
diff --git a/exif/LICENSE b/exif/LICENSE
new file mode 100644
index 0000000..1024291
--- /dev/null
+++ b/exif/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 bigflood
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/exif/lib/exif.dart b/exif/lib/exif.dart
new file mode 100644
index 0000000..27e69a9
--- /dev/null
+++ b/exif/lib/exif.dart
@@ -0,0 +1,5 @@
+library exif;
+
+export 'src/exif_types.dart';
+export 'src/print_exif.dart' show printExifOfBytes;
+export 'src/read_exif.dart' show readExifFromBytes, readExifFromFile;
diff --git a/exif/lib/src/exif_decode_makernote.dart b/exif/lib/src/exif_decode_makernote.dart
new file mode 100644
index 0000000..def03a5
--- /dev/null
+++ b/exif/lib/src/exif_decode_makernote.dart
@@ -0,0 +1,301 @@
+import 'dart:typed_data';
+
+import 'package:exif/src/exifheader.dart';
+import 'package:exif/src/field_types.dart';
+import 'package:exif/src/makernote_apple.dart';
+import 'package:exif/src/makernote_canon.dart';
+import 'package:exif/src/makernote_casio.dart';
+import 'package:exif/src/makernote_fujifilm.dart';
+import 'package:exif/src/makernote_nikon.dart';
+import 'package:exif/src/makernote_olympus.dart';
+import 'package:exif/src/reader.dart';
+import 'package:exif/src/tags_info.dart';
+import 'package:exif/src/util.dart';
+
+class DecodeMakerNote {
+  final Map<String, IfdTagImpl> tags;
+  final IfdReader file;
+
+  void Function(int ifd, String ifdName,
+      {Map<int, MakerTag>? tagDict, bool relative}) dumpIfdFunc;
+
+  DecodeMakerNote(this.tags, this.file, this.dumpIfdFunc);
+
+  // deal with MakerNote contained in EXIF IFD
+  // (Some apps use MakerNote tags but do not use a format for which we
+  // have a description, do not process these).
+  void decode() {
+    final note = tags['EXIF MakerNote'];
+    if (note == null) {
+      return;
+    }
+
+    // Some apps use MakerNote tags but do not use a format for which we
+    // have a description, so just do a raw dump for these.
+    final make = tags['Image Make']?.tag.printable ?? '';
+    if (make == '') {
+      return;
+    }
+
+    _decodeMakerNote(note: note, make: make);
+  }
+
+  // Decode all the camera-specific MakerNote formats
+  // Note is the data that comprises this MakerNote.
+  // The MakerNote will likely have pointers in it that point to other
+  // parts of the file. We'll use this.offset as the starting point for
+  // most of those pointers, since they are relative to the beginning
+  // of the file.
+  // If the MakerNote is in a newer format, it may use relative addressing
+  // within the MakerNote. In that case we'll use relative addresses for
+  // the pointers.
+  // As an aside: it's not just to be annoying that the manufacturers use
+  // relative offsets.  It's so that if the makernote has to be moved by the
+  // picture software all of the offsets don't have to be adjusted.  Overall,
+  // this is probably the right strategy for makernotes, though the spec is
+  // ambiguous.
+  // The spec does not appear to imagine that makernotes would
+  // follow EXIF format internally.  Once they did, it's ambiguous whether
+  // the offsets should be from the header at the start of all the EXIF info,
+  // or from the header at the start of the makernote.
+  void _decodeMakerNote({required IfdTagImpl note, required String make}) {
+    if (_decodeNikon(note, make)) {
+      return;
+    }
+
+    if (_decodeOlympus(note, make)) {
+      return;
+    }
+
+    if (_decodeCasio(note, make)) {
+      return;
+    }
+
+    if (_decodeFujifilm(note, make)) {
+      return;
+    }
+
+    if (_decodeApple(note, make)) {
+      return;
+    }
+
+    if (_decodeCanon(note, make)) {
+      return;
+    }
+  }
+
+  bool _decodeNikon(IfdTagImpl note, String make) {
+    // Nikon
+    // The maker note usually starts with the word Nikon, followed by the
+    // type of the makernote (1 or 2, as a short).  If the word Nikon is
+    // not at the start of the makernote, it's probably type 2, since some
+    // cameras work that way.
+    if (!make.contains('NIKON')) {
+      return false;
+    }
+
+    if (listHasPrefix(
+        note.tag.values.toList(), [78, 105, 107, 111, 110, 0, 1])) {
+      // Looks like a type 1 Nikon MakerNote
+      _dumpIfd(note.fieldOffset + 8, tagDict: MakerNoteNikon.tagsOld);
+    } else if (listHasPrefix(
+        note.tag.values.toList(), [78, 105, 107, 111, 110, 0, 2])) {
+      // Looks like a labeled type 2 Nikon MakerNote
+      if (!listHasPrefix(note.tag.values.toList(), [0, 42], start: 12) &&
+          !listHasPrefix(note.tag.values.toList(), [42, 0], start: 12)) {
+        throw const FormatException("Missing marker tag '42' in MakerNote.");
+        // skip the Makernote label and the TIFF header
+      }
+      _dumpIfd(note.fieldOffset + 10 + 8,
+          tagDict: MakerNoteNikon.tagsNew, relative: true);
+    } else {
+      // E99x or D1
+      // Looks like an unlabeled type 2 Nikon MakerNote
+      _dumpIfd(note.fieldOffset, tagDict: MakerNoteNikon.tagsNew);
+    }
+    return true;
+  }
+
+  bool _decodeOlympus(IfdTagImpl note, String make) {
+    if (make.startsWith('OLYMPUS')) {
+      _dumpIfd(note.fieldOffset + 8, tagDict: MakerNoteOlympus.tags);
+      // TODO
+      //for i in (('MakerNote Tag 0x2020', makernote.OLYMPUS_TAG_0x2020),):
+      //    this.decode_olympus_tag(tags[i[0]].values, i[1])
+      //return
+      return true;
+    }
+    return false;
+  }
+
+  bool _decodeCasio(IfdTagImpl note, String make) {
+    if (make.contains('CASIO') || make.contains('Casio')) {
+      _dumpIfd(note.fieldOffset, tagDict: MakerNoteCasio.tags);
+      return true;
+    }
+    return false;
+  }
+
+  bool _decodeFujifilm(IfdTagImpl note, String make) {
+    if (make != 'FUJIFILM') {
+      return false;
+    }
+
+    // bug: everything else is "Motorola" endian, but the MakerNote
+    // is "Intel" endian
+    const endian = Endian.little;
+
+    // bug: IFD offsets are from beginning of MakerNote, not
+    // beginning of file header
+    final newBaseOffset = file.baseOffset + note.fieldOffset;
+
+    // process note with bogus values (note is actually at offset 12)
+    _dumpIfd2(12,
+        tagDict: MakerNoteFujifilm.tags,
+        baseOffset: newBaseOffset,
+        endian: endian);
+
+    return true;
+  }
+
+  bool _decodeApple(IfdTagImpl note, String make) {
+    if (!_makerIsApple(note, make)) {
+      return false;
+    }
+
+    final newBaseOffset = file.baseOffset + note.fieldOffset + 14;
+
+    _dumpIfd2(0,
+        tagDict: MakerNoteApple.tags,
+        baseOffset: newBaseOffset,
+        endian: file.endian);
+
+    return true;
+  }
+
+  bool _makerIsApple(IfdTagImpl note, String make) =>
+      make == 'Apple' &&
+      listHasPrefix(note.tag.values.toList(),
+          [65, 112, 112, 108, 101, 32, 105, 79, 83, 0]);
+
+  bool _decodeCanon(IfdTagImpl note, String make) {
+    if (make != 'Canon') {
+      return false;
+    }
+
+    _dumpIfd(note.fieldOffset, tagDict: MakerNoteCanon.tags);
+
+    MakerNoteCanon.tagsXxx.forEach((name, makerTags) {
+      final tag = tags[name];
+      if (tag != null) {
+        _canonDecodeTag(
+            tag.tag.values.toList().whereType<int>().toList(), makerTags);
+        tags.remove(name);
+      }
+    });
+
+    final cannonTag = tags[MakerNoteCanon.cameraInfoTagName];
+    if (cannonTag != null) {
+      _canonDecodeCameraInfo(cannonTag);
+      tags.remove(MakerNoteCanon.cameraInfoTagName);
+    }
+
+    return true;
+  }
+
+  // TODO Decode Olympus MakerNote tag based on offset within tag
+  // void _olympus_decode_tag(List<int> value, mn_tags) {}
+
+  // Decode Canon MakerNote tag based on offset within tag.
+  // See http://www.burren.cx/david/canon.html by David Burren
+  void _canonDecodeTag(List<int> value, Map<int, MakerTag> mnTags) {
+    for (int i = 1; i < value.length; i++) {
+      final tag = mnTags[i] ?? MakerTag.make('Unknown');
+      final name = tag.name;
+      String val;
+      if (tag.map != null) {
+        val = tag.map![value[i]] ?? 'Unknown';
+      } else {
+        val = value[i].toString();
+      }
+
+      // it's not a real IFD Tag but we fake one to make everybody
+      // happy. this will have a "proprietary" type
+      tags['MakerNote $name'] = IfdTagImpl(printable: val);
+    }
+  }
+
+  // Decode the variable length encoded camera info section.
+  void _canonDecodeCameraInfo(IfdTagImpl cameraInfoTag) {
+    final modelTag = tags['Image Model'];
+    if (modelTag == null) {
+      return;
+    }
+
+    final model = modelTag.tag.values.toString();
+
+    Map<int, CameraInfo>? cameraInfoTags;
+    for (final modelNameRegExp in MakerNoteCanon.cameraInfoModelMap.keys) {
+      final tagDesc = MakerNoteCanon.cameraInfoModelMap[modelNameRegExp];
+      if (RegExp(modelNameRegExp).hasMatch(model)) {
+        cameraInfoTags = tagDesc;
+        break;
+      }
+    }
+
+    if (cameraInfoTags == null) {
+      return;
+    }
+
+    // We are assuming here that these are all unsigned bytes (Byte or
+    // Unknown)
+    if (cameraInfoTag.fieldType != FieldType.byte &&
+        cameraInfoTag.fieldType != FieldType.undefined) {
+      return;
+    }
+
+    if (cameraInfoTag.tag.values is! List<int>) {
+      return;
+    }
+
+    final cameraInfo = cameraInfoTag.tag.values as List<int>;
+
+    // Look for each data value and decode it appropriately.
+    for (final entry in cameraInfoTags.entries) {
+      final offset = entry.key;
+      final tag = entry.value;
+      final tagSize = tag.tagSize;
+      if (cameraInfo.length < offset + tagSize) {
+        continue;
+      }
+
+      final packedTagValue = cameraInfo.sublist(offset, offset + tagSize);
+      final tagValue = s2nLittleEndian(packedTagValue);
+
+      tags['MakerNote ${tag.tagName}'] =
+          IfdTagImpl(printable: tag.function(tagValue));
+    }
+  }
+
+  void _dumpIfd(int ifd,
+      {required Map<int, MakerTag> tagDict, bool relative = false}) {
+    dumpIfdFunc(ifd, 'MakerNote', tagDict: tagDict, relative: relative);
+  }
+
+  void _dumpIfd2(int ifd,
+      {required Map<int, MakerTag>? tagDict,
+      bool relative = false,
+      required int baseOffset,
+      required Endian endian}) {
+    final originalEndian = file.endian;
+    final originalOffset = file.baseOffset;
+
+    file.endian = endian;
+    file.baseOffset = baseOffset;
+
+    dumpIfdFunc(ifd, 'MakerNote', tagDict: tagDict, relative: relative);
+
+    file.endian = originalEndian;
+    file.baseOffset = originalOffset;
+  }
+}
diff --git a/exif/lib/src/exif_thumbnail.dart b/exif/lib/src/exif_thumbnail.dart
new file mode 100644
index 0000000..788cab0
--- /dev/null
+++ b/exif/lib/src/exif_thumbnail.dart
@@ -0,0 +1,116 @@
+import 'dart:typed_data';
+
+import 'package:exif/src/exifheader.dart';
+import 'package:exif/src/field_types.dart';
+import 'package:exif/src/reader.dart';
+
+class Thumbnail {
+  final Map<String, IfdTagImpl> tags;
+  final IfdReader file;
+
+  Thumbnail(this.tags, this.file);
+
+  // Extract uncompressed TIFF thumbnail.
+  // Take advantage of the pre-existing layout in the thumbnail IFD as
+  // much as possible
+  List<int>? extractTiffThumbnail(int thumbIfd) {
+    final thumb = tags['Thumbnail Compression'];
+    if (thumb == null || thumb.tag.printable != 'Uncompressed TIFF') {
+      return null;
+    }
+
+    List<int> tiff;
+    int stripOff = 0;
+    int stripLen = 0;
+
+    final entries = file.readInt(thumbIfd, 2);
+    // this is header plus offset to IFD ...
+    if (file.endian == Endian.big) {
+      tiff = 'MM\x00*\x00\x00\x00\x08'.codeUnits;
+    } else {
+      tiff = 'II*\x00\x08\x00\x00\x00'.codeUnits;
+      // ... plus thumbnail IFD data plus a null "next IFD" pointer
+    }
+
+    tiff.addAll(file.readSlice(thumbIfd, entries * 12 + 2));
+    tiff.addAll([0, 0, 0, 0]);
+
+    // fix up large value offset pointers into data area
+    for (int i = 0; i < entries; i++) {
+      final entry = thumbIfd + 2 + 12 * i;
+      final tag = file.readInt(entry, 2);
+      final fieldType = file.readInt(entry + 2, 2);
+      final typeLength = fieldTypes[fieldType].length;
+      final count = file.readInt(entry + 4, 4);
+      final oldOffset = file.readInt(entry + 8, 4);
+      // start of the 4-byte pointer area in entry
+      final ptr = i * 12 + 18;
+      // remember strip offsets location
+      if (tag == 0x0111) {
+        stripOff = ptr;
+        stripLen = count * typeLength;
+        // is it in the data area?
+      }
+      if (count * typeLength > 4) {
+        // update offset pointer (nasty "strings are immutable" crap)
+        // should be able to say "tiff[ptr:ptr+4]=newOffset"
+        final tiff0 = tiff;
+        final newOffset = tiff0.length;
+        tiff = tiff0.sublist(0, ptr);
+        tiff.addAll(file.offsetToBytes(newOffset, 4));
+        tiff.addAll(tiff0.sublist(ptr + 4));
+        // remember strip offsets location
+        if (tag == 0x0111) {
+          stripOff = newOffset;
+          stripLen = 4;
+        }
+        // get original data and store it
+        tiff.addAll(file.readSlice(oldOffset, count * typeLength));
+      }
+    }
+
+    // add pixel strips and update strip offset info
+    final oldOffsets = tags['Thumbnail StripOffsets']?.tag.values.toList();
+    final oldCounts = tags['Thumbnail StripByteCounts']?.tag.values.toList();
+    if (oldOffsets == null || oldCounts == null) {
+      return null;
+    }
+
+    for (int i = 0; i < oldOffsets.length; i++) {
+      // update offset pointer (more nasty "strings are immutable" crap)
+      final tiff0 = tiff;
+      final offset = file.offsetToBytes(tiff0.length, stripLen);
+      tiff = tiff0.sublist(0, stripOff);
+      tiff.addAll(offset);
+      tiff.addAll(tiff0.sublist(stripOff + stripLen));
+      stripOff += stripLen;
+      // add pixel strip to end
+      tiff.addAll(file.readSlice(oldOffsets[i] as int, oldCounts[i] as int));
+    }
+
+    return tiff;
+  }
+
+  // Extract JPEG thumbnail.
+  // (Thankfully the JPEG data is stored as a unit.)
+  List<int>? extractJpegThumbnail() {
+    final thumbFmt = tags['Thumbnail JPEGInterchangeFormat'];
+    final thumbFmtLen = tags['Thumbnail JPEGInterchangeFormatLength'];
+    if (thumbFmt != null && thumbFmtLen != null) {
+      final size = thumbFmtLen.tag.values.firstAsInt();
+      final values = file.readSlice(thumbFmt.tag.values.firstAsInt(), size);
+      return values;
+    }
+
+    // Sometimes in a TIFF file, a JPEG thumbnail is hidden in the MakerNote
+    // since it's not allowed in a uncompressed TIFF IFD
+    final thumbnail = tags['MakerNote JPEGThumbnail'];
+    if (thumbnail != null) {
+      final values = file.readSlice(
+          thumbnail.tag.values.firstAsInt(), thumbnail.fieldLength);
+      return values;
+    }
+
+    return null;
+  }
+}
diff --git a/exif/lib/src/exif_types.dart b/exif/lib/src/exif_types.dart
new file mode 100644
index 0000000..390f9e0
--- /dev/null
+++ b/exif/lib/src/exif_types.dart
@@ -0,0 +1,149 @@
+import 'dart:typed_data';
+
+class IfdTag {
+  /// tag ID number
+  final int tag;
+
+  final String tagType;
+
+  /// printable version of data
+  final String printable;
+
+  /// list of data items (int(char or number) or Ratio)
+  final IfdValues values;
+
+  IfdTag({
+    required this.tag,
+    required this.tagType,
+    required this.printable,
+    required this.values,
+  });
+
+  @override
+  String toString() => printable;
+}
+
+abstract class IfdValues {
+  const IfdValues();
+
+  List toList();
+
+  int get length;
+
+  int firstAsInt();
+}
+
+class IfdNone extends IfdValues {
+  const IfdNone();
+
+  @override
+  List toList() => [];
+
+  @override
+  int get length => 0;
+
+  @override
+  int firstAsInt() => 0;
+
+  @override
+  String toString() => "[]";
+}
+
+class IfdRatios extends IfdValues {
+  final List<Ratio> ratios;
+
+  const IfdRatios(this.ratios);
+
+  @override
+  List toList() => ratios;
+
+  @override
+  int get length => ratios.length;
+
+  @override
+  int firstAsInt() => ratios[0].toInt();
+
+  @override
+  String toString() => ratios.toString();
+}
+
+class IfdInts extends IfdValues {
+  final List<int> ints;
+
+  const IfdInts(this.ints);
+
+  @override
+  List toList() => ints;
+
+  @override
+  int get length => ints.length;
+
+  @override
+  int firstAsInt() => ints[0];
+
+  @override
+  String toString() => ints.toString();
+}
+
+class IfdBytes extends IfdValues {
+  final Uint8List bytes;
+
+  IfdBytes(this.bytes);
+
+  IfdBytes.empty() : bytes = Uint8List(0);
+
+  IfdBytes.fromList(List<int> list) : bytes = Uint8List.fromList(list);
+
+  @override
+  List toList() => bytes;
+
+  @override
+  int get length => bytes.length;
+
+  @override
+  int firstAsInt() => bytes[0];
+
+  @override
+  String toString() => bytes.toString();
+}
+
+/// Ratio object that eventually will be able to reduce itself to lowest
+/// common denominator for printing.
+class Ratio {
+  final int numerator;
+  final int denominator;
+
+  factory Ratio(int num, int den) {
+    if (den < 0) {
+      num *= -1;
+      den *= -1;
+    }
+
+    final d = num.gcd(den);
+    if (d > 1) {
+      num = num ~/ d;
+      den = den ~/ d;
+    }
+
+    return Ratio._internal(num, den);
+  }
+
+  Ratio._internal(this.numerator, this.denominator);
+
+  @override
+  String toString() =>
+      (denominator == 1) ? '$numerator' : '$numerator/$denominator';
+
+  int toInt() => numerator ~/ denominator;
+
+  double toDouble() => numerator / denominator;
+}
+
+class ExifData {
+  final Map<String, IfdTag> tags;
+  final List<String> warnings;
+
+  const ExifData(this.tags, this.warnings);
+
+  ExifData.withWarning(String warning) : this(const {}, [warning]);
+}
diff --git a/exif/lib/src/exifheader.dart b/exif/lib/src/exifheader.dart
new file mode 100644
index 0000000..8e26683
--- /dev/null
+++ b/exif/lib/src/exifheader.dart
@@ -0,0 +1,173 @@
+import 'package:exif/src/exif_thumbnail.dart';
+import 'package:exif/src/exif_types.dart';
+import 'package:exif/src/field_types.dart';
+import 'package:exif/src/reader.dart';
+import 'package:exif/src/tags.dart';
+import 'package:exif/src/tags_info.dart';
+import 'package:exif/src/values_to_printable.dart';
+import 'package:sprintf/sprintf.dart' show sprintf;
+
+const defaultStopTag = 'UNDEF';
+
+// To ignore when quick processing
+const ignoreTags = [
+  0x9286, // user comment
+  0x927C, // MakerNote Tags
+  0x02BC, // XPM
+];
+
+// Eases dealing with tags.
+class IfdTagImpl {
+  final IfdTag tag;
+
+  final FieldType fieldType;
+
+  // offset of start of field in bytes from beginning of IFD
+  int fieldOffset;
+
+  // length of data field in bytes
+  int fieldLength;
+
+  IfdTagImpl({
+    this.fieldType = FieldType.proprietary,
+    this.fieldOffset = 0,
+    this.fieldLength = 0,
+    String printable = '',
+    int tag = -1,
+    IfdValues values = const IfdNone(),
+  }) : tag = IfdTag(
+          tag: tag,
+          tagType: fieldType.name,
+          printable: printable,
+          values: values,
+        );
+}
+
+/// Handle an EXIF header.
+class ExifHeader {
+  bool strict;
+  bool debug;
+  bool detailed;
+  bool truncateTags;
+  Map<String, IfdTagImpl> tags = {};
+  List<String> warnings = [];
+  IfdReader file;
+
+  ExifHeader({
+    required this.file,
+    required this.strict,
+    this.debug = false,
+    this.detailed = true,
+    this.truncateTags = true,
+  });
+
+  // Return a list of entries in the given IFD.
+  void dumpIfd(int ifd, String ifdName,
+      {Map<int, MakerTag>? tagDict, bool relative = false, String? stopTag}) {
+    stopTag ??= defaultStopTag;
+    tagDict ??= StandardTags.tags;
+
+    // make sure we can process the entries
+    List<IfdEntry> entries;
+    try {
+      entries = file.readIfdEntries(ifd, relative: relative);
+    } catch (e) {
+      warnings.add("Possibly corrupted IFD: $ifd");
+      return;
+    }
+
+    for (final entry in entries) {
+      // get tag name early to avoid errors, help debug
+      final MakerTag? tagEntry = tagDict[entry.tag];
+      String tagName;
+      if (tagEntry != null) {
+        tagName = tagEntry.name;
+      } else {
+        tagName = sprintf('Tag 0x%04X', [entry.tag]);
+      }
+
+      // ignore certain tags for faster processing
+      if (detailed || !ignoreTags.contains(entry.tag)) {
+        processTag(
+            ifd: ifd,
+            ifdName: ifdName,
+            tagEntry: tagEntry,
+            entry: entry,
+            tagName: tagName,
+            relative: relative,
+            stopTag: stopTag);
+
+        if (tagName == stopTag) {
+          break;
+        }
+      }
+    }
+  }
+
+  void processTag(
+      {required int ifd,
+      required String ifdName,
+      required MakerTag? tagEntry,
+      required IfdEntry entry,
+      required String tagName,
+      required bool relative,
+      required String? stopTag}) {
+    // unknown field type
+    if (!entry.fieldType.isValid) {
+      if (!strict) {
+        return;
+      } else {
+        throw FormatException(sprintf(
+            'Unknown type %d in tag 0x%04X', [entry.fieldType, entry.tag]));
+      }
+    }
+
+    final values = file.readField(entry, tagName: tagName);
+
+    // now 'values' is either a string or an array
+    final printable = ValuesToPrintable.convert(values, entry,
+        tagEntry: tagEntry, truncateTags: truncateTags);
+    if (printable.malformed) {
+      warnings.add("Possibly corrupted field $tagName in $ifdName IFD");
+    }
+
+    final makerTags = tagEntry?.tags;
+    if (makerTags != null) {
+      try {
+        dumpIfd(values.firstAsInt(), makerTags.name,
+            tagDict: makerTags.tags, stopTag: stopTag);
+      } on RangeError {
+        warnings.add('No values found for ${makerTags.name} SubIFD');
+      }
+    }
+
+    tags['$ifdName $tagName'] = IfdTagImpl(
+        printable: printable.value,
+        tag: entry.tag,
+        fieldType: entry.fieldType,
+        values: values,
+        fieldOffset: entry.fieldOffset,
+        fieldLength: entry.count * entry.fieldType.length);
+
+    // var t = tags[ifd_name + ' ' + tag_name];
+  }
+
+  void extractTiffThumbnail(int thumbIfd) {
+    final values = Thumbnail(tags, file).extractTiffThumbnail(thumbIfd);
+    if (values != null) {
+      tags['TIFFThumbnail'] = IfdTagImpl(values: IfdBytes.fromList(values));
+    }
+  }
+
+  void extractJpegThumbnail() {
+    final values = Thumbnail(tags, file).extractJpegThumbnail();
+    if (values != null) {
+      tags['JPEGThumbnail'] = IfdTagImpl(values: IfdBytes.fromList(values));
+    }
+  }
+
+  void parseXmp(String xmpString) {
+    tags['Image ApplicationNotes'] =
+        IfdTagImpl(printable: xmpString, fieldType: FieldType.byte);
+  }
+}
diff --git a/exif/lib/src/field_types.dart b/exif/lib/src/field_types.dart
new file mode 100644
index 0000000..532ebad
--- /dev/null
+++ b/exif/lib/src/field_types.dart
@@ -0,0 +1,65 @@
+class FieldType {
+  final int _value;
+  final int length;
+  final String abbr;
+  final String name;
+  final bool isValid;
+  final bool isSigned;
+
+  const FieldType(this._value, this.length, this.abbr, this.name,
+      {this.isValid = true, this.isSigned = false});
+
+  factory FieldType.ofValue(int v) {
+    if (v < 0 || v >= fieldTypes.length) {
+      return FieldType(v, 0, 'X', 'Unknown', isValid: false);
+    }
+    return fieldTypes[v];
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      other is FieldType && _value == other._value;
+
+  @override
+  int get hashCode => _value.hashCode;
+
+  static const proprietary =
+      FieldType(0, 0, 'X', 'Proprietary', isValid: false); // no such type
+  static const byte = FieldType(1, 1, 'B', 'Byte');
+  static const ascii = FieldType(2, 1, 'A', 'ASCII');
+  static const short = FieldType(3, 2, 'S', 'Short');
+  static const long = FieldType(4, 4, 'L', 'Long');
+  static const ratio = FieldType(5, 8, 'R', 'Ratio');
+  static const signedByte =
+      FieldType(6, 1, 'SB', 'Signed Byte', isSigned: true);
+  static const undefined = FieldType(7, 1, 'U', 'Undefined');
+  static const signedShort =
+      FieldType(8, 2, 'SS', 'Signed Short', isSigned: true);
+  static const signedLong =
+      FieldType(9, 4, 'SL', 'Signed Long', isSigned: true);
+  static const signedRatio =
+      FieldType(10, 8, 'SR', 'Signed Ratio', isSigned: true);
+  static const f32 =
+      FieldType(11, 4, 'F32', 'Single-Precision Floating Point (32-bit)');
+  static const f64 =
+      FieldType(12, 8, 'F64', 'Double-Precision Floating Point (64-bit)');
+  static const ifd = FieldType(13, 4, 'L', 'IFD');
+}
+
+// field type descriptions as (length, abbreviation, full name) tuples
+const fieldTypes = [
+  FieldType.proprietary, // no such type
+  FieldType.byte,
+  FieldType.ascii,
+  FieldType.short,
+  FieldType.long,
+  FieldType.ratio,
+  FieldType.signedByte,
+  FieldType.undefined,
+  FieldType.signedShort,
+  FieldType.signedLong,
+  FieldType.signedRatio,
+  FieldType.f32,
+  FieldType.f64,
+  FieldType.ifd,
+];
diff --git a/exif/lib/src/file_interface.dart b/exif/lib/src/file_interface.dart
new file mode 100644
index 0000000..8c21b3a
--- /dev/null
+++ b/exif/lib/src/file_interface.dart
@@ -0,0 +1,61 @@
+import 'dart:async';
+
+import 'package:exif/src/file_interface_generic.dart'
+    if (dart.library.html) "package:exif/src/file_interface_html.dart"
+    if (dart.library.io) 'package:exif/src/file_interface_io.dart';
+
+abstract class FileReader {
+  static Future<FileReader> fromFile(dynamic file) async {
+    return createFileReaderFromFile(file);
+  }
+
+  factory FileReader.fromBytes(List<int> bytes) {
+    return _BytesReader(bytes);
+  }
+
+  int readByteSync();
+
+  List<int> readSync(int bytes);
+
+  int positionSync();
+
+  void setPositionSync(int position);
+}
+
+class _BytesReader implements FileReader {
+  List<int> bytes;
+  int readPos = 0;
+
+  _BytesReader(this.bytes);
+
+  @override
+  int positionSync() {
+    return readPos;
+  }
+
+  @override
+  int readByteSync() {
+    return bytes[readPos++];
+  }
+
+  @override
+  List<int> readSync(int n) {
+    final start = readPos;
+    if (start >= bytes.length) {
+      return [];
+    }
+
+    var end = readPos + n;
+    if (end > bytes.length) {
+      end = bytes.length;
+    }
+    final r = bytes.sublist(start, end);
+    readPos += end - start;
+    return r;
+  }
+
+  @override
+  void setPositionSync(int position) {
+    readPos = position;
+  }
+}
diff --git a/exif/lib/src/file_interface_generic.dart b/exif/lib/src/file_interface_generic.dart
new file mode 100644
index 0000000..11a6b3c
--- /dev/null
+++ b/exif/lib/src/file_interface_generic.dart
@@ -0,0 +1,10 @@
+import 'dart:async';
+
+import 'package:exif/src/file_interface.dart';
+
+Future<FileReader> createFileReaderFromFile(dynamic file) async {
+  if (file is List<int>) {
+    return FileReader.fromBytes(file);
+  }
+  throw UnsupportedError("Can't read file of type: ${file.runtimeType}");
+}
diff --git a/exif/lib/src/file_interface_html.dart b/exif/lib/src/file_interface_html.dart
new file mode 100644
index 0000000..d68e69d
--- /dev/null
+++ b/exif/lib/src/file_interface_html.dart
@@ -0,0 +1,20 @@
+import 'dart:async';
+import 'dart:html' as dart_html;
+import 'dart:typed_data';
+
+import 'package:exif/src/file_interface.dart';
+
+Future<FileReader> createFileReaderFromFile(dynamic file) async {
+  if (file is dart_html.File) {
+    final fileReader = dart_html.FileReader();
+    fileReader.readAsArrayBuffer(file);
+    await fileReader.onLoad.first;
+    final data = fileReader.result;
+    if (data is Uint8List) {
+      return FileReader.fromBytes(data);
+    }
+  } else if (file is List<int>) {
+    return FileReader.fromBytes(file);
+  }
+  throw UnsupportedError("Can't read file of type: ${file.runtimeType}");
+}
diff --git a/exif/lib/src/file_interface_io.dart b/exif/lib/src/file_interface_io.dart
new file mode 100644
index 0000000..47283d0
--- /dev/null
+++ b/exif/lib/src/file_interface_io.dart
@@ -0,0 +1,42 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:exif/src/file_interface.dart';
+
+class _FileReader implements FileReader {
+  final RandomAccessFile file;
+
+  _FileReader(this.file);
+
+  @override
+  int positionSync() {
+    return file.positionSync();
+  }
+
+  @override
+  int readByteSync() {
+    return file.readByteSync();
+  }
+
+  @override
+  List<int> readSync(int bytes) {
+    return file.readSync(bytes).toList(growable: false);
+  }
+
+  @override
+  void setPositionSync(int position) {
+    file.setPositionSync(position);
+  }
+}
+
+Future<FileReader> createFileReaderFromFile(dynamic file) async {
+  if (file is RandomAccessFile) {
+    return _FileReader(file);
+  } else if (file is File) {
+    final data = await file.readAsBytes();
+    return FileReader.fromBytes(data);
+  } else if (file is List<int>) {
+    return FileReader.fromBytes(file);
+  }
+  throw UnsupportedError("Can't read file of type: ${file.runtimeType}");
+}
diff --git a/exif/lib/src/heic.dart b/exif/lib/src/heic.dart
new file mode 100644
index 0000000..4bd4565
--- /dev/null
+++ b/exif/lib/src/heic.dart
@@ -0,0 +1,276 @@
+import 'dart:typed_data';
+
+import 'package:exif/src/file_interface.dart';
+import 'package:exif/src/util.dart';
+
+class HeicBox {
+  final String name;
+
+  int version = 0;
+  int minorVersion = 0;
+  int itemCount = 0;
+  int size = 0;
+  int after = 0;
+  int pos = 0;
+  List compat = [];
+
+  // this is full of boxes, but not in a predictable order.
+  Map<String, HeicBox> subs = {};
+  Map<int, List<List<int>>> locs = {};
+  HeicBox? exifInfe;
+  int itemId = 0;
+  Uint8List? itemType;
+  Uint8List? itemName;
+  int itemProtectionIndex = 0;
+  Uint8List? majorBrand;
+  int flags = 0;
+
+  HeicBox(this.name);
+
+  void setFull(int vflags) {
+    /**
+        ISO boxes come in 'old' and 'full' variants.
+        The 'full' variant contains version and flags information.
+     */
+    version = vflags >> 24;
+    flags = vflags & 0x00ffffff;
+  }
+}
+
+class HEICExifFinder {
+  final FileReader fileReader;
+
+  const HEICExifFinder(this.fileReader);
+
+  Uint8List getBytes(int nbytes) {
+    final bytes = fileReader.readSync(nbytes);
+    if (bytes.length != nbytes) {
+      throw Exception("Bad size");
+    }
+    return Uint8List.fromList(bytes);
+  }
+
+  int getInt(int size) {
+    // some fields have variant-sized data.
+    if (size == 2) {
+      return ByteData.view(getBytes(2).buffer).getInt16(0);
+    }
+    if (size == 4) {
+      return ByteData.view(getBytes(4).buffer).getInt32(0);
+    }
+    if (size == 8) {
+      return ByteData.view(getBytes(8).buffer).getInt64(0);
+    }
+    if (size == 0) {
+      return 0;
+    }
+    throw Exception("Bad size");
+  }
+
+  Uint8List getString() {
+    final List<Uint8List> read = [];
+    while (true) {
+      final char = getBytes(1);
+      if (listEqual(char, Uint8List.fromList('\x00'.codeUnits))) {
+        break;
+      }
+      read.add(char);
+    }
+    return Uint8List.fromList(read.expand((x) => x).toList());
+  }
+
+  List<int> getInt4x2() {
+    final num = getBytes(1).single;
+    final num0 = num >> 4;
+    final num1 = num & 0xf;
+    return [num0, num1];
+  }
+
+  HeicBox nextBox() {
+    final pos = fileReader.positionSync();
+    int size = ByteData.view(getBytes(4).buffer).getInt32(0);
+    final kind = String.fromCharCodes(getBytes(4));
+    final box = HeicBox(kind);
+    if (size == 0) {
+      //  signifies 'to the end of the file', we shouldn't see this.
+      throw Exception("Unknown error");
+    }
+    if (size == 1) {
+      // 64-bit size follows type.
+      size = ByteData.view(getBytes(8).buffer).getInt64(0);
+      box.size = size - 16;
+      box.after = pos + size;
+    } else {
+      box.size = size - 8;
+      box.after = pos + size;
+    }
+    box.pos = fileReader.positionSync();
+    return box;
+  }
+
+  void _parseFtyp(HeicBox box) {
+    box.majorBrand = getBytes(4);
+    box.minorVersion = ByteData.view(getBytes(4).buffer).getInt32(0);
+    box.compat = [];
+    int size = box.size - 8;
+    while (size > 0) {
+      box.compat.add(getBytes(4));
+      size -= 4;
+    }
+  }
+
+  void _parseMeta(HeicBox meta) {
+    meta.setFull(ByteData.view(getBytes(4).buffer).getInt32(0));
+    while (fileReader.positionSync() < meta.after) {
+      final box = nextBox();
+      final psub = getParser(box);
+      if (psub != null) {
+        psub(box);
+        meta.subs[box.name] = box;
+      }
+      // skip any unparsed data
+      fileReader.setPositionSync(box.after);
+    }
+  }
+
+  void _parseInfe(HeicBox box) {
+    box.setFull(ByteData.view(getBytes(4).buffer).getInt32(0));
+    if (box.version >= 2) {
+      if (box.version == 2) {
+        box.itemId = ByteData.view(getBytes(2).buffer).getInt16(0);
+      } else if (box.version == 3) {
+        box.itemId = ByteData.view(getBytes(4).buffer).getInt32(0);
+      }
+      box.itemProtectionIndex = ByteData.view(getBytes(2).buffer).getInt16(0);
+      box.itemType = getBytes(4);
+      box.itemName = getString();
+      // ignore the rest
+    }
+  }
+
+  void _parseIinf(HeicBox box) {
+    box.setFull(ByteData.view(getBytes(4).buffer).getInt32(0));
+    final count = ByteData.view(getBytes(2).buffer).getInt16(0);
+    box.exifInfe = null;
+    for (var i = 0; i < count; i += 1) {
+      final infe = expectParse('infe');
+      if (listEqual(infe.itemType, Uint8List.fromList('Exif'.codeUnits))) {
+        box.exifInfe = infe;
+        break;
+      }
+    }
+  }
+
+  void _parseIloc(HeicBox box) {
+    box.setFull(ByteData.view(getBytes(4).buffer).getInt32(0));
+    final size = getInt4x2();
+    final size2 = getInt4x2();
+
+    final offsetSize = size[0];
+    final lengthSize = size[1];
+    final baseOffsetSize = size2[0];
+    final indexSize = size2[1];
+
+    if (box.version < 2) {
+      box.itemCount = ByteData.view(getBytes(2).buffer).getInt16(0);
+    } else if (box.version == 2) {
+      box.itemCount = ByteData.view(getBytes(4).buffer).getInt32(0);
+    } else {
+      throw Exception("Box version 2, ${box.version}");
+    }
+    box.locs = {};
+    for (var i = 0; i < box.itemCount; i += 1) {
+      int itemId;
+      if (box.version < 2) {
+        itemId = ByteData.view(getBytes(2).buffer).getInt16(0);
+      } else if (box.version == 2) {
+        itemId = ByteData.view(getBytes(4).buffer).getInt32(0);
+      } else {
+        throw Exception("Box version 2, ${box.version}");
+      }
+
+      if (box.version == 1 || box.version == 2) {
+        // ignore construction_method
+        ByteData.view(getBytes(2).buffer).getInt16(0);
+      }
+      // ignore data_reference_index
+      ByteData.view(getBytes(2).buffer).getInt16(0);
+      final baseOffset = getInt(baseOffsetSize);
+      final extentCount = ByteData.view(getBytes(2).buffer).getInt16(0);
+      final List<List<int>> extent = [];
+      for (var i = 0; i < extentCount; i += 1) {
+        if ((box.version == 1 || box.version == 2) && indexSize > 0) {
+          getInt(indexSize);
+        }
+        final extentOffset = getInt(offsetSize);
+        final extentLength = getInt(lengthSize);
+        extent.add([baseOffset + extentOffset, extentLength]);
+      }
+      box.locs[itemId] = extent;
+    }
+  }
+
+  void Function(HeicBox)? getParser(HeicBox box) {
+    final defs = {
+      'ftyp': _parseFtyp,
+      'meta': _parseMeta,
+      'infe': _parseInfe,
+      'iinf': _parseIinf,
+      'iloc': _parseIloc,
+    };
+    return defs[box.name];
+  }
+
+  HeicBox parseBox(HeicBox box) {
+    final probe = getParser(box);
+    if (probe == null) {
+      throw Exception('Unhandled box');
+    }
+    probe(box);
+    //  in case anything is left unread
+    fileReader.setPositionSync(box.after);
+    return box;
+  }
+
+  HeicBox expectParse(String name) {
+    while (true) {
+      final box = nextBox();
+      if (box.name == name) {
+        return parseBox(box);
+      }
+      fileReader.setPositionSync(box.after);
+    }
+  }
+
+  List<int> findExif() {
+    final ftyp = expectParse('ftyp');
+    assert(listEqual(ftyp.majorBrand, Uint8List.fromList('heic'.codeUnits)) ||
+        listEqual(ftyp.majorBrand, Uint8List.fromList('avif'.codeUnits)));
+    assert(ftyp.minorVersion == 0);
+    final meta = expectParse('meta');
+    final itemId = meta.subs['iinf']?.exifInfe?.itemId;
+    if (itemId == null) {
+      return [];
+    }
+    final extents = meta.subs['iloc']?.locs[itemId];
+    // we expect the Exif data to be in one piece.
+    if (extents == null || extents.length != 1) {
+      return [];
+    }
+    final int pos = extents[0][0];
+    // looks like there's a kind of pseudo-box here.
+    fileReader.setPositionSync(pos);
+    // the payload of "Exif" item may be start with either
+    //  b'\xFF\xE1\xSS\xSSExif\x00\x00' (with APP1 marker, e.g. Android Q)
+    //  or
+    // b'Exif\x00\x00' (without APP1 marker, e.g. iOS)
+    // according to "ISO/IEC 23008-12, 2017-12", both of them are legal
+    final exifTiffHeaderOffset = ByteData.view(getBytes(4).buffer).getInt32(0);
+    assert(exifTiffHeaderOffset >= 6);
+    getBytes(exifTiffHeaderOffset);
+    // assert self.get(exif_tiff_header_offset)[-6:] == b'Exif\x00\x00'
+    final offset = fileReader.positionSync();
+    final endian = fileReader.readSync(1)[0];
+    return [offset, endian];
+  }
+}
diff --git a/exif/lib/src/linereader.dart b/exif/lib/src/linereader.dart
new file mode 100644
index 0000000..b2b51cf
--- /dev/null
+++ b/exif/lib/src/linereader.dart
@@ -0,0 +1,57 @@
+import 'dart:convert';
+
+import 'package:exif/src/file_interface.dart';
+
+class LineReader {
+  FileReader file;
+  final List<int> _buffer = [];
+  bool _endOfFile = false;
+
+  LineReader(this.file);
+
+  String popString(int n) {
+    String s;
+
+    if (n < _buffer.length) {
+      s = utf8.decode(_buffer.sublist(0, n));
+      _buffer.removeRange(0, n);
+    } else {
+      s = utf8.decode(_buffer);
+      _buffer.clear();
+    }
+
+    return s;
+  }
+
+  String readLine() {
+    int endOfLine = _buffer.indexOf(10);
+    if (endOfLine >= 0) {
+      return popString(endOfLine + 1);
+    }
+
+    if (_endOfFile) {
+      return popString(_buffer.length);
+    }
+
+    while (true) {
+      final r = file.readSync(1024 * 10);
+
+      if (r.isEmpty) {
+        _endOfFile = true;
+        endOfLine = -1;
+      } else {
+        endOfLine = r.indexOf(10);
+        _buffer.addAll(r);
+        if (endOfLine >= 0) {
+          endOfLine += _buffer.length;
+        }
+      }
+
+      if (endOfLine >= 0) {
+        return popString(endOfLine + 1);
+      } else if (_endOfFile) {
+        return popString(_buffer.length);
+      }
+    }
+  }
+}
diff --git a/exif/lib/src/makernote_apple.dart b/exif/lib/src/makernote_apple.dart
new file mode 100644
index 0000000..206aec1
--- /dev/null
+++ b/exif/lib/src/makernote_apple.dart
@@ -0,0 +1,18 @@
+import 'package:exif/src/tags_info.dart' show MakerTag, TagsBase;
+
+// Makernote (proprietary) tag definitions for Apple iOS
+// Based on version 1.01 of ExifTool -> Image/ExifTool/Apple.pm
+// http://owl.phy.queensu.ca/~phil/exiftool/
+
+class MakerNoteApple extends TagsBase {
+  //static MakerTag _make(String name) => MakerTag.make(name);
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static final tags = {
+    0x000a: _withMap('HDRImageType', {
+      3: 'HDR Image',
+      4: 'Original Image',
+    }),
+  };
+}
diff --git a/exif/lib/src/makernote_canon.dart b/exif/lib/src/makernote_canon.dart
new file mode 100644
index 0000000..8ed7f61
--- /dev/null
+++ b/exif/lib/src/makernote_canon.dart
@@ -0,0 +1,676 @@
+import 'package:exif/src/tags_info.dart' show MakerTag, TagsBase;
+import 'package:sprintf/sprintf.dart' show sprintf;
+
+// Makernote (proprietary) tag definitions for Canon.
+// http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Canon.html
+
+class MakerNoteCanon extends TagsBase {
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static final tags = {
+    0x0003: _make('FlashInfo'),
+    0x0006: _make('ImageType'),
+    0x0007: _make('FirmwareVersion'),
+    0x0008: _make('ImageNumber'),
+    0x0009: _make('OwnerName'),
+    0x000c: _make('SerialNumber'),
+    0x000e: _make('FileLength'),
+    0x0010: _withMap('ModelID', {
+      0x1010000: 'PowerShot A30',
+      0x1040000: 'PowerShot S300 / Digital IXUS 300 / IXY Digital 300',
+      0x1060000: 'PowerShot A20',
+      0x1080000: 'PowerShot A10',
+      0x1090000: 'PowerShot S110 / Digital IXUS v / IXY Digital 200',
+      0x1100000: 'PowerShot G2',
+      0x1110000: 'PowerShot S40',
+      0x1120000: 'PowerShot S30',
+      0x1130000: 'PowerShot A40',
+      0x1140000: 'EOS D30',
+      0x1150000: 'PowerShot A100',
+      0x1160000: 'PowerShot S200 / Digital IXUS v2 / IXY Digital 200a',
+      0x1170000: 'PowerShot A200',
+      0x1180000: 'PowerShot S330 / Digital IXUS 330 / IXY Digital 300a',
+      0x1190000: 'PowerShot G3',
+      0x1210000: 'PowerShot S45',
+      0x1230000: 'PowerShot SD100 / Digital IXUS II / IXY Digital 30',
+      0x1240000: 'PowerShot S230 / Digital IXUS v3 / IXY Digital 320',
+      0x1250000: 'PowerShot A70',
+      0x1260000: 'PowerShot A60',
+      0x1270000: 'PowerShot S400 / Digital IXUS 400 / IXY Digital 400',
+      0x1290000: 'PowerShot G5',
+      0x1300000: 'PowerShot A300',
+      0x1310000: 'PowerShot S50',
+      0x1340000: 'PowerShot A80',
+      0x1350000: 'PowerShot SD10 / Digital IXUS i / IXY Digital L',
+      0x1360000: 'PowerShot S1 IS',
+      0x1370000: 'PowerShot Pro1',
+      0x1380000: 'PowerShot S70',
+      0x1390000: 'PowerShot S60',
+      0x1400000: 'PowerShot G6',
+      0x1410000: 'PowerShot S500 / Digital IXUS 500 / IXY Digital 500',
+      0x1420000: 'PowerShot A75',
+      0x1440000: 'PowerShot SD110 / Digital IXUS IIs / IXY Digital 30a',
+      0x1450000: 'PowerShot A400',
+      0x1470000: 'PowerShot A310',
+      0x1490000: 'PowerShot A85',
+      0x1520000: 'PowerShot S410 / Digital IXUS 430 / IXY Digital 450',
+      0x1530000: 'PowerShot A95',
+      0x1540000: 'PowerShot SD300 / Digital IXUS 40 / IXY Digital 50',
+      0x1550000: 'PowerShot SD200 / Digital IXUS 30 / IXY Digital 40',
+      0x1560000: 'PowerShot A520',
+      0x1570000: 'PowerShot A510',
+      0x1590000: 'PowerShot SD20 / Digital IXUS i5 / IXY Digital L2',
+      0x1640000: 'PowerShot S2 IS',
+      0x1650000:
+          'PowerShot SD430 / Digital IXUS Wireless / IXY Digital Wireless',
+      0x1660000: 'PowerShot SD500 / Digital IXUS 700 / IXY Digital 600',
+      0x1668000: 'EOS D60',
+      0x1700000: 'PowerShot SD30 / Digital IXUS i Zoom / IXY Digital L3',
+      0x1740000: 'PowerShot A430',
+      0x1750000: 'PowerShot A410',
+      0x1760000: 'PowerShot S80',
+      0x1780000: 'PowerShot A620',
+      0x1790000: 'PowerShot A610',
+      0x1800000: 'PowerShot SD630 / Digital IXUS 65 / IXY Digital 80',
+      0x1810000: 'PowerShot SD450 / Digital IXUS 55 / IXY Digital 60',
+      0x1820000: 'PowerShot TX1',
+      0x1870000: 'PowerShot SD400 / Digital IXUS 50 / IXY Digital 55',
+      0x1880000: 'PowerShot A420',
+      0x1890000: 'PowerShot SD900 / Digital IXUS 900 Ti / IXY Digital 1000',
+      0x1900000: 'PowerShot SD550 / Digital IXUS 750 / IXY Digital 700',
+      0x1920000: 'PowerShot A700',
+      0x1940000:
+          'PowerShot SD700 IS / Digital IXUS 800 IS / IXY Digital 800 IS',
+      0x1950000: 'PowerShot S3 IS',
+      0x1960000: 'PowerShot A540',
+      0x1970000: 'PowerShot SD600 / Digital IXUS 60 / IXY Digital 70',
+      0x1980000: 'PowerShot G7',
+      0x1990000: 'PowerShot A530',
+      0x2000000:
+          'PowerShot SD800 IS / Digital IXUS 850 IS / IXY Digital 900 IS',
+      0x2010000: 'PowerShot SD40 / Digital IXUS i7 / IXY Digital L4',
+      0x2020000: 'PowerShot A710 IS',
+      0x2030000: 'PowerShot A640',
+      0x2040000: 'PowerShot A630',
+      0x2090000: 'PowerShot S5 IS',
+      0x2100000: 'PowerShot A460',
+      0x2120000:
+          'PowerShot SD850 IS / Digital IXUS 950 IS / IXY Digital 810 IS',
+      0x2130000: 'PowerShot A570 IS',
+      0x2140000: 'PowerShot A560',
+      0x2150000: 'PowerShot SD750 / Digital IXUS 75 / IXY Digital 90',
+      0x2160000: 'PowerShot SD1000 / Digital IXUS 70 / IXY Digital 10',
+      0x2180000: 'PowerShot A550',
+      0x2190000: 'PowerShot A450',
+      0x2230000: 'PowerShot G9',
+      0x2240000: 'PowerShot A650 IS',
+      0x2260000: 'PowerShot A720 IS',
+      0x2290000: 'PowerShot SX100 IS',
+      0x2300000:
+          'PowerShot SD950 IS / Digital IXUS 960 IS / IXY Digital 2000 IS',
+      0x2310000:
+          'PowerShot SD870 IS / Digital IXUS 860 IS / IXY Digital 910 IS',
+      0x2320000:
+          'PowerShot SD890 IS / Digital IXUS 970 IS / IXY Digital 820 IS',
+      0x2360000: 'PowerShot SD790 IS / Digital IXUS 90 IS / IXY Digital 95 IS',
+      0x2370000: 'PowerShot SD770 IS / Digital IXUS 85 IS / IXY Digital 25 IS',
+      0x2380000: 'PowerShot A590 IS',
+      0x2390000: 'PowerShot A580',
+      0x2420000: 'PowerShot A470',
+      0x2430000: 'PowerShot SD1100 IS / Digital IXUS 80 IS / IXY Digital 20 IS',
+      0x2460000: 'PowerShot SX1 IS',
+      0x2470000: 'PowerShot SX10 IS',
+      0x2480000: 'PowerShot A1000 IS',
+      0x2490000: 'PowerShot G10',
+      0x2510000: 'PowerShot A2000 IS',
+      0x2520000: 'PowerShot SX110 IS',
+      0x2530000:
+          'PowerShot SD990 IS / Digital IXUS 980 IS / IXY Digital 3000 IS',
+      0x2540000:
+          'PowerShot SD880 IS / Digital IXUS 870 IS / IXY Digital 920 IS',
+      0x2550000: 'PowerShot E1',
+      0x2560000: 'PowerShot D10',
+      0x2570000:
+          'PowerShot SD960 IS / Digital IXUS 110 IS / IXY Digital 510 IS',
+      0x2580000: 'PowerShot A2100 IS',
+      0x2590000: 'PowerShot A480',
+      0x2600000: 'PowerShot SX200 IS',
+      0x2610000:
+          'PowerShot SD970 IS / Digital IXUS 990 IS / IXY Digital 830 IS',
+      0x2620000:
+          'PowerShot SD780 IS / Digital IXUS 100 IS / IXY Digital 210 IS',
+      0x2630000: 'PowerShot A1100 IS',
+      0x2640000:
+          'PowerShot SD1200 IS / Digital IXUS 95 IS / IXY Digital 110 IS',
+      0x2700000: 'PowerShot G11',
+      0x2710000: 'PowerShot SX120 IS',
+      0x2720000: 'PowerShot S90',
+      0x2750000: 'PowerShot SX20 IS',
+      0x2760000:
+          'PowerShot SD980 IS / Digital IXUS 200 IS / IXY Digital 930 IS',
+      0x2770000:
+          'PowerShot SD940 IS / Digital IXUS 120 IS / IXY Digital 220 IS',
+      0x2800000: 'PowerShot A495',
+      0x2810000: 'PowerShot A490',
+      0x2820000: 'PowerShot A3100 IS / A3150 IS',
+      0x2830000: 'PowerShot A3000 IS',
+      0x2840000: 'PowerShot SD1400 IS / IXUS 130 / IXY 400F',
+      0x2850000: 'PowerShot SD1300 IS / IXUS 105 / IXY 200F',
+      0x2860000: 'PowerShot SD3500 IS / IXUS 210 / IXY 10S',
+      0x2870000: 'PowerShot SX210 IS',
+      0x2880000: 'PowerShot SD4000 IS / IXUS 300 HS / IXY 30S',
+      0x2890000: 'PowerShot SD4500 IS / IXUS 1000 HS / IXY 50S',
+      0x2920000: 'PowerShot G12',
+      0x2930000: 'PowerShot SX30 IS',
+      0x2940000: 'PowerShot SX130 IS',
+      0x2950000: 'PowerShot S95',
+      0x2980000: 'PowerShot A3300 IS',
+      0x2990000: 'PowerShot A3200 IS',
+      0x3000000: 'PowerShot ELPH 500 HS / IXUS 310 HS / IXY 31S',
+      0x3010000: 'PowerShot Pro90 IS',
+      0x3010001: 'PowerShot A800',
+      0x3020000: 'PowerShot ELPH 100 HS / IXUS 115 HS / IXY 210F',
+      0x3030000: 'PowerShot SX230 HS',
+      0x3040000: 'PowerShot ELPH 300 HS / IXUS 220 HS / IXY 410F',
+      0x3050000: 'PowerShot A2200',
+      0x3060000: 'PowerShot A1200',
+      0x3070000: 'PowerShot SX220 HS',
+      0x3080000: 'PowerShot G1 X',
+      0x3090000: 'PowerShot SX150 IS',
+      0x3100000: 'PowerShot ELPH 510 HS / IXUS 1100 HS / IXY 51S',
+      0x3110000: 'PowerShot S100 (new)',
+      0x3130000: 'PowerShot SX40 HS',
+      0x3120000: 'PowerShot ELPH 310 HS / IXUS 230 HS / IXY 600F',
+      0x3160000: 'PowerShot A1300',
+      0x3170000: 'PowerShot A810',
+      0x3180000: 'PowerShot ELPH 320 HS / IXUS 240 HS / IXY 420F',
+      0x3190000: 'PowerShot ELPH 110 HS / IXUS 125 HS / IXY 220F',
+      0x3200000: 'PowerShot D20',
+      0x3210000: 'PowerShot A4000 IS',
+      0x3220000: 'PowerShot SX260 HS',
+      0x3230000: 'PowerShot SX240 HS',
+      0x3240000: 'PowerShot ELPH 530 HS / IXUS 510 HS / IXY 1',
+      0x3250000: 'PowerShot ELPH 520 HS / IXUS 500 HS / IXY 3',
+      0x3260000: 'PowerShot A3400 IS',
+      0x3270000: 'PowerShot A2400 IS',
+      0x3280000: 'PowerShot A2300',
+      0x3330000: 'PowerShot G15',
+      0x3340000: 'PowerShot SX50',
+      0x3350000: 'PowerShot SX160 IS',
+      0x3360000: 'PowerShot S110 (new)',
+      0x3370000: 'PowerShot SX500 IS',
+      0x3380000: 'PowerShot N',
+      0x3390000: 'IXUS 245 HS / IXY 430F',
+      0x3400000: 'PowerShot SX280 HS',
+      0x3410000: 'PowerShot SX270 HS',
+      0x3420000: 'PowerShot A3500 IS',
+      0x3430000: 'PowerShot A2600',
+      0x3450000: 'PowerShot A1400',
+      0x3460000: 'PowerShot ELPH 130 IS / IXUS 140 / IXY 110F',
+      0x3470000: 'PowerShot ELPH 115/120 IS / IXUS 132/135 / IXY 90F/100F',
+      0x3490000: 'PowerShot ELPH 330 HS / IXUS 255 HS / IXY 610F',
+      0x3510000: 'PowerShot A2500',
+      0x3540000: 'PowerShot G16',
+      0x3550000: 'PowerShot S120',
+      0x3560000: 'PowerShot SX170 IS',
+      0x3580000: 'PowerShot SX510 HS',
+      0x3590000: 'PowerShot S200 (new)',
+      0x3600000: 'IXY 620F',
+      0x3610000: 'PowerShot N100',
+      0x3640000: 'PowerShot G1 X Mark II',
+      0x3650000: 'PowerShot D30',
+      0x3660000: 'PowerShot SX700 HS',
+      0x3670000: 'PowerShot SX600 HS',
+      0x3680000: 'PowerShot ELPH 140 IS / IXUS 150 / IXY 130',
+      0x3690000: 'PowerShot ELPH 135 / IXUS 145 / IXY 120',
+      0x3700000: 'PowerShot ELPH 340 HS / IXUS 265 HS / IXY 630',
+      0x3710000: 'PowerShot ELPH 150 IS / IXUS 155 / IXY 140',
+      0x3740000: 'EOS M3',
+      0x3750000: 'PowerShot SX60 HS',
+      0x3760000: 'PowerShot SX520 HS',
+      0x3770000: 'PowerShot SX400 IS',
+      0x3780000: 'PowerShot G7 X',
+      0x3790000: 'PowerShot N2',
+      0x3800000: 'PowerShot SX530 HS',
+      0x3820000: 'PowerShot SX710 HS',
+      0x3830000: 'PowerShot SX610 HS',
+      0x3870000: 'PowerShot ELPH 160 / IXUS 160',
+      0x3890000: 'PowerShot ELPH 170 IS / IXUS 170',
+      0x3910000: 'PowerShot SX410 IS',
+      0x4040000: 'PowerShot G1',
+      0x6040000: 'PowerShot S100 / Digital IXUS / IXY Digital',
+      0x4007d673: 'DC19/DC21/DC22',
+      0x4007d674: 'XH A1',
+      0x4007d675: 'HV10',
+      0x4007d676: 'MD130/MD140/MD150/MD160/ZR850',
+      0x4007d777: 'DC50',
+      0x4007d778: 'HV20',
+      0x4007d779: 'DC211',
+      0x4007d77a: 'HG10',
+      0x4007d77b: 'HR10',
+      0x4007d77d: 'MD255/ZR950',
+      0x4007d81c: 'HF11',
+      0x4007d878: 'HV30',
+      0x4007d87c: 'XH A1S',
+      0x4007d87e: 'DC301/DC310/DC311/DC320/DC330',
+      0x4007d87f: 'FS100',
+      0x4007d880: 'HF10',
+      0x4007d882: 'HG20/HG21',
+      0x4007d925: 'HF21',
+      0x4007d926: 'HF S11',
+      0x4007d978: 'HV40',
+      0x4007d987: 'DC410/DC411/DC420',
+      0x4007d988: 'FS19/FS20/FS21/FS22/FS200',
+      0x4007d989: 'HF20/HF200',
+      0x4007d98a: 'HF S10/S100',
+      0x4007da8e: 'HF R10/R16/R17/R18/R100/R106',
+      0x4007da8f: 'HF M30/M31/M36/M300/M306',
+      0x4007da90: 'HF S20/S21/S200',
+      0x4007da92: 'FS31/FS36/FS37/FS300/FS305/FS306/FS307',
+      0x4007dda9: 'HF G25',
+      0x80000001: 'EOS-1D',
+      0x80000167: 'EOS-1DS',
+      0x80000168: 'EOS 10D',
+      0x80000169: 'EOS-1D Mark III',
+      0x80000170: 'EOS Digital Rebel / 300D / Kiss Digital',
+      0x80000174: 'EOS-1D Mark II',
+      0x80000175: 'EOS 20D',
+      0x80000176: 'EOS Digital Rebel XSi / 450D / Kiss X2',
+      0x80000188: 'EOS-1Ds Mark II',
+      0x80000189: 'EOS Digital Rebel XT / 350D / Kiss Digital N',
+      0x80000190: 'EOS 40D',
+      0x80000213: 'EOS 5D',
+      0x80000215: 'EOS-1Ds Mark III',
+      0x80000218: 'EOS 5D Mark II',
+      0x80000219: 'WFT-E1',
+      0x80000232: 'EOS-1D Mark II N',
+      0x80000234: 'EOS 30D',
+      0x80000236: 'EOS Digital Rebel XTi / 400D / Kiss Digital X',
+      0x80000241: 'WFT-E2',
+      0x80000246: 'WFT-E3',
+      0x80000250: 'EOS 7D',
+      0x80000252: 'EOS Rebel T1i / 500D / Kiss X3',
+      0x80000254: 'EOS Rebel XS / 1000D / Kiss F',
+      0x80000261: 'EOS 50D',
+      0x80000269: 'EOS-1D X',
+      0x80000270: 'EOS Rebel T2i / 550D / Kiss X4',
+      0x80000271: 'WFT-E4',
+      0x80000273: 'WFT-E5',
+      0x80000281: 'EOS-1D Mark IV',
+      0x80000285: 'EOS 5D Mark III',
+      0x80000286: 'EOS Rebel T3i / 600D / Kiss X5',
+      0x80000287: 'EOS 60D',
+      0x80000288: 'EOS Rebel T3 / 1100D / Kiss X50',
+      0x80000289: 'EOS 7D Mark II',
+      0x80000297: 'WFT-E2 II',
+      0x80000298: 'WFT-E4 II',
+      0x80000301: 'EOS Rebel T4i / 650D / Kiss X6i',
+      0x80000302: 'EOS 6D',
+      0x80000324: 'EOS-1D C',
+      0x80000325: 'EOS 70D',
+      0x80000326: 'EOS Rebel T5i / 700D / Kiss X7i',
+      0x80000327: 'EOS Rebel T5 / 1200D / Kiss X70',
+      0x80000331: 'EOS M',
+      0x80000355: 'EOS M2',
+      0x80000346: 'EOS Rebel SL1 / 100D / Kiss X7',
+      0x80000347: 'EOS Rebel T6s / 760D / 8000D',
+      0x80000382: 'EOS 5DS',
+      0x80000393: 'EOS Rebel T6i / 750D / Kiss X8i',
+      0x80000401: 'EOS 5DS R',
+    }),
+    0x0013: _make('ThumbnailImageValidArea'),
+    0x0015: _withMap(
+        'SerialNumberFormat', {0x90000000: 'Format 1', 0xA0000000: 'Format 2'}),
+    0x001a:
+        _withMap('SuperMacro', {0: 'Off', 1: 'On const ()', 2: 'On const ()'}),
+    0x001c: _withMap('DateStampMode', {
+      0: 'Off',
+      1: 'Date',
+      2: 'Date & Time',
+    }),
+    0x001e: _make('FirmwareRevision'),
+    0x0028: _make('ImageUniqueID'),
+    0x0095: _make('LensModel'),
+    0x0096: _make('InternalSerialNumber '),
+    0x0097: _make('DustRemovalData '),
+    0x0098: _make('CropInfo '),
+    0x009a: _make('AspectInfo'),
+    0x00b4: _withMap('ColorSpace', {1: 'sRGB', 2: 'Adobe RGB'}),
+  };
+
+  static final tagsXxx = {
+    'MakerNote Tag 0x0001': cameraSettings,
+    'MakerNote Tag 0x0002': focalLength,
+    'MakerNote Tag 0x0004': shotInfo,
+    'MakerNote Tag 0x0026': afInfo2,
+    'MakerNote Tag 0x0093': fileInfo,
+  };
+
+  // this is in element offset, name, optional value dictionary format
+  // 0x0001
+  static Map<int, MakerTag> cameraSettings = {
+    1: _withMap('Macromode', {1: 'Macro', 2: 'Normal'}),
+    2: _make('SelfTimer'),
+    3: _withMap(
+        'Quality', {1: 'Economy', 2: 'Normal', 3: 'Fine', 5: 'Superfine'}),
+    4: _withMap('FlashMode', {
+      0: 'Flash Not Fired',
+      1: 'Auto',
+      2: 'On',
+      3: 'Red-Eye Reduction',
+      4: 'Slow Synchro',
+      5: 'Auto + Red-Eye Reduction',
+      6: 'On + Red-Eye Reduction',
+      16: 'external flash'
+    }),
+    5: _withMap('ContinuousDriveMode', {
+      0: 'Single Or Timer',
+      1: 'Continuous',
+      2: 'Movie',
+    }),
+    7: _withMap('FocusMode', {
+      0: 'One-Shot',
+      1: 'AI Servo',
+      2: 'AI Focus',
+      3: 'MF',
+      4: 'Single',
+      5: 'Continuous',
+      6: 'MF'
+    }),
+    9: _withMap('RecordMode', {
+      1: 'JPEG',
+      2: 'CRW+THM',
+      3: 'AVI+THM',
+      4: 'TIF',
+      5: 'TIF+JPEG',
+      6: 'CR2',
+      7: 'CR2+JPEG',
+      9: 'Video'
+    }),
+    10: _withMap('ImageSize', {0: 'Large', 1: 'Medium', 2: 'Small'}),
+    11: _withMap('EasyShootingMode', {
+      0: 'Full Auto',
+      1: 'Manual',
+      2: 'Landscape',
+      3: 'Fast Shutter',
+      4: 'Slow Shutter',
+      5: 'Night',
+      6: 'B&W',
+      7: 'Sepia',
+      8: 'Portrait',
+      9: 'Sports',
+      10: 'Macro/Close-Up',
+      11: 'Pan Focus',
+      51: 'High Dynamic Range',
+    }),
+    12: _withMap('DigitalZoom', {0: 'None', 1: '2x', 2: '4x', 3: 'Other'}),
+    13: _withMap('Contrast', {0xFFFF: 'Low', 0: 'Normal', 1: 'High'}),
+    14: _withMap('Saturation', {0xFFFF: 'Low', 0: 'Normal', 1: 'High'}),
+    15: _withMap('Sharpness', {0xFFFF: 'Low', 0: 'Normal', 1: 'High'}),
+    16: _withMap('ISO', {
+      0: 'See ISOSpeedRatings Tag',
+      15: 'Auto',
+      16: '50',
+      17: '100',
+      18: '200',
+      19: '400'
+    }),
+    17: _withMap('MeteringMode', {
+      0: 'Default',
+      1: 'Spot',
+      2: 'Average',
+      3: 'Evaluative',
+      4: 'Partial',
+      5: 'Center-weighted'
+    }),
+    18: _withMap('FocusType', {
+      0: 'Manual',
+      1: 'Auto',
+      3: 'Close-Up (Macro)',
+      8: 'Locked (Pan Mode)'
+    }),
+    19: _withMap('AFPointSelected', {
+      0x3000: 'None (MF)',
+      0x3001: 'Auto-Selected',
+      0x3002: 'Right',
+      0x3003: 'Center',
+      0x3004: 'Left'
+    }),
+    20: _withMap('ExposureMode', {
+      0: 'Easy Shooting',
+      1: 'Program',
+      2: 'Tv-priority',
+      3: 'Av-priority',
+      4: 'Manual',
+      5: 'A-DEP'
+    }),
+    22: _make('LensType'),
+    23: _make('LongFocalLengthOfLensInFocalUnits'),
+    24: _make('ShortFocalLengthOfLensInFocalUnits'),
+    25: _make('FocalUnitsPerMM'),
+    28: _withMap('FlashActivity', {0: 'Did Not Fire', 1: 'Fired'}),
+    29: _withMap('FlashDetails', {
+      0: 'Manual',
+      1: 'TTL',
+      2: 'A-TTL',
+      3: 'E-TTL',
+      4: 'FP Sync Enabled',
+      7: '2nd("Rear")-Curtain Sync Used',
+      11: 'FP Sync Used',
+      13: 'Internal Flash',
+      14: 'External E-TTL'
+    }),
+    32: _withMap('FocusMode', {0: 'Single', 1: 'Continuous', 8: 'Manual'}),
+    33: _withMap('AESetting', {
+      0: 'Normal AE',
+      1: 'Exposure Compensation',
+      2: 'AE Lock',
+      3: 'AE Lock + Exposure Comp.',
+      4: 'No AE'
+    }),
+    34: _withMap('ImageStabilization', {
+      0: 'Off',
+      1: 'On',
+      2: 'Shoot Only',
+      3: 'Panning',
+      4: 'Dynamic',
+      256: 'Off',
+      257: 'On',
+      258: 'Shoot Only',
+      259: 'Panning',
+      260: 'Dynamic'
+    }),
+    39: _withMap('SpotMeteringMode', {0: 'Center', 1: 'AF Point'}),
+    41: _withMap('ManualFlashOutput', {
+      0x0: 'n/a',
+      0x500: 'Full',
+      0x502: 'Medium',
+      0x504: 'Low',
+      0x7fff: 'n/a'
+    }),
+  };
+
+  // 0x0002
+  static Map<int, MakerTag> focalLength = {
+    1: _withMap('FocalType', {
+      1: 'Fixed',
+      2: 'Zoom',
+    }),
+    2: _make('FocalLength'),
+  };
+
+  // 0x0004
+  static Map<int, MakerTag> shotInfo = {
+    7: _withMap('WhiteBalance', {
+      0: 'Auto',
+      1: 'Sunny',
+      2: 'Cloudy',
+      3: 'Tungsten',
+      4: 'Fluorescent',
+      5: 'Flash',
+      6: 'Custom'
+    }),
+    8: _withMap('SlowShutter',
+        {-1: 'n/a', 0: 'Off', 1: 'Night Scene', 2: 'On', 3: 'None'}),
+    9: _make('SequenceNumber'),
+    14: _make('AFPointUsed'),
+    15: _withMap('FlashBias', {
+      0xFFC0: '-2 EV',
+      0xFFCC: '-1.67 EV',
+      0xFFD0: '-1.50 EV',
+      0xFFD4: '-1.33 EV',
+      0xFFE0: '-1 EV',
+      0xFFEC: '-0.67 EV',
+      0xFFF0: '-0.50 EV',
+      0xFFF4: '-0.33 EV',
+      0x0000: '0 EV',
+      0x000c: '0.33 EV',
+      0x0010: '0.50 EV',
+      0x0014: '0.67 EV',
+      0x0020: '1 EV',
+      0x002c: '1.33 EV',
+      0x0030: '1.50 EV',
+      0x0034: '1.67 EV',
+      0x0040: '2 EV'
+    }),
+    19: _make('SubjectDistance'),
+  };
+
+  // 0x0026
+  static Map<int, MakerTag> afInfo2 = {
+    2: _withMap('AFAreaMode', {
+      0: 'Off (Manual Focus)',
+      2: 'Single-point AF',
+      4: 'Multi-point AF or AI AF',
+      5: 'Face Detect AF',
+      6: 'Face + Tracking',
+      7: 'Zone AF',
+      8: 'AF Point Expansion',
+      9: 'Spot AF',
+      11: 'Flexizone Multi',
+      13: 'Flexizone Single',
+    }),
+    3: _make('NumAFPoints'),
+    4: _make('ValidAFPoints'),
+    5: _make('CanonImageWidth'),
+  };
+
+  // 0x0093
+  static Map<int, MakerTag> fileInfo = {
+    1: _make('FileNumber'),
+    3: _withMap('BracketMode', {
+      0: 'Off',
+      1: 'AEB',
+      2: 'FEB',
+      3: 'ISO',
+      4: 'WB',
+    }),
+    4: _make('BracketValue'),
+    5: _make('BracketShotNumber'),
+    6: _withMap('RawJpgQuality', {
+      0xFFFF: 'n/a',
+      1: 'Economy',
+      2: 'Normal',
+      3: 'Fine',
+      4: 'RAW',
+      5: 'Superfine',
+      130: 'Normal Movie'
+    }),
+    7: _withMap('RawJpgSize', {
+      0: 'Large',
+      1: 'Medium',
+      2: 'Small',
+      5: 'Medium 1',
+      6: 'Medium 2',
+      7: 'Medium 3',
+      8: 'Postcard',
+      9: 'Widescreen',
+      10: 'Medium Widescreen',
+      14: 'Small 1',
+      15: 'Small 2',
+      16: 'Small 3',
+      128: '640x480 Movie',
+      129: 'Medium Movie',
+      130: 'Small Movie',
+      137: '1280x720 Movie',
+      142: '1920x1080 Movie',
+    }),
+    8: _withMap('LongExposureNoiseReduction2',
+        {0: 'Off', 1: 'On (1D)', 2: 'On', 3: 'Auto'}),
+    9: _withMap(
+        'WBBracketMode', {0: 'Off', 1: 'On (shift AB)', 2: 'On (shift GM)'}),
+    12: _make('WBBracketValueAB'),
+    13: _make('WBBracketValueGM'),
+    14: _withMap('FilterEffect',
+        {0: 'None', 1: 'Yellow', 2: 'Orange', 3: 'Red', 4: 'Green'}),
+    15: _withMap('ToningEffect', {
+      0: 'None',
+      1: 'Sepia',
+      2: 'Blue',
+      3: 'Purple',
+      4: 'Green',
+    }),
+    16: _make('MacroMagnification'),
+    19: _withMap('LiveViewShooting', {0: 'Off', 1: 'On'}),
+    25: _withMap('FlashExposureLock', {0: 'Off', 1: 'On'})
+  };
+
+  static String addOneFunc(int value) {
+    return "${value + 1}";
+  }
+
+  static String subtractOneFunc(int value) {
+    return "${value - 1}";
+  }
+
+  static String convertTempFunc(int value) {
+    return sprintf('%d C', [value - 128]);
+  }
+
+  // CameraInfo data structures have variable sized members. Each entry here is:
+  // byte offset:  (item name, data item type, decoding map).
+  // Note that the data item type is fed directly to struct.unpack at the
+  // specified offset.
+  static const cameraInfoTagName = 'MakerNote Tag 0x000D';
+
+  // A map of regular expressions on 'Image Model' to the CameraInfo spec
+  static Map<String, Map<int, CameraInfo>> cameraInfoModelMap = {
+    r'EOS 5D$': {
+      23: const CameraInfo('CameraTemperature', 1, convertTempFunc),
+      204: const CameraInfo('DirectoryIndex', 4, subtractOneFunc),
+      208: const CameraInfo('FileIndex', 2, addOneFunc),
+    },
+    r'EOS 5D Mark II$': {
+      25: const CameraInfo('CameraTemperature', 1, convertTempFunc),
+      443: const CameraInfo('FileIndex', 4, addOneFunc),
+      455: const CameraInfo('DirectoryIndex', 4, subtractOneFunc),
+    },
+    r'EOS 5D Mark III$': {
+      27: const CameraInfo('CameraTemperature', 1, convertTempFunc),
+      652: const CameraInfo('FileIndex', 4, addOneFunc),
+      656: const CameraInfo('FileIndex2', 4, addOneFunc),
+      664: const CameraInfo('DirectoryIndex', 4, subtractOneFunc),
+      668: const CameraInfo('DirectoryIndex2', 4, subtractOneFunc),
+    },
+    r'\b(600D|REBEL T3i|Kiss X5)\b': {
+      25: const CameraInfo('CameraTemperature', 1, convertTempFunc),
+      475: const CameraInfo('FileIndex', 4, addOneFunc),
+      487: const CameraInfo('DirectoryIndex', 4, subtractOneFunc),
+    },
+  };
+}
+
+class CameraInfo {
+  final String tagName;
+  final int tagSize;
+  final String Function(int) function;
+
+  const CameraInfo(
+    this.tagName,
+    this.tagSize,
+    this.function,
+  );
+}
diff --git a/exif/lib/src/makernote_casio.dart b/exif/lib/src/makernote_casio.dart
new file mode 100644
index 0000000..e706e60
--- /dev/null
+++ b/exif/lib/src/makernote_casio.dart
@@ -0,0 +1,63 @@
+import 'package:exif/src/tags_info.dart' show MakerTag, TagsBase;
+
+// Makernote (proprietary) tag definitions for casio.
+
+class MakerNoteCasio extends TagsBase {
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static Map<int, MakerTag> tags = {
+    0x0001: _withMap('RecordingMode', {
+      1: 'Single Shutter',
+      2: 'Panorama',
+      3: 'Night Scene',
+      4: 'Portrait',
+      5: 'Landscape',
+    }),
+    0x0002: _withMap('Quality', {1: 'Economy', 2: 'Normal', 3: 'Fine'}),
+    0x0003: _withMap('FocusingMode',
+        {2: 'Macro', 3: 'Auto Focus', 4: 'Manual Focus', 5: 'Infinity'}),
+    0x0004: _withMap('FlashMode', {
+      1: 'Auto',
+      2: 'On',
+      3: 'Off',
+      4: 'Red Eye Reduction',
+    }),
+    0x0005:
+        _withMap('FlashIntensity', {11: 'Weak', 13: 'Normal', 15: 'Strong'}),
+    0x0006: _make('Object Distance'),
+    0x0007: _withMap('WhiteBalance', {
+      1: 'Auto',
+      2: 'Tungsten',
+      3: 'Daylight',
+      4: 'Fluorescent',
+      5: 'Shade',
+      129: 'Manual'
+    }),
+    0x000B: _withMap('Sharpness', {
+      0: 'Normal',
+      1: 'Soft',
+      2: 'Hard',
+    }),
+    0x000C: _withMap('Contrast', {
+      0: 'Normal',
+      1: 'Low',
+      2: 'High',
+    }),
+    0x000D: _withMap('Saturation', {
+      0: 'Normal',
+      1: 'Low',
+      2: 'High',
+    }),
+    0x0014: _withMap('CCDSpeed', {
+      64: 'Normal',
+      80: 'Normal',
+      100: 'High',
+      125: '+1.0',
+      244: '+3.0',
+      250: '+2.0'
+    }),
+  };
+}
diff --git a/exif/lib/src/makernote_fujifilm.dart b/exif/lib/src/makernote_fujifilm.dart
new file mode 100644
index 0000000..b00f15e
--- /dev/null
+++ b/exif/lib/src/makernote_fujifilm.dart
@@ -0,0 +1,101 @@
+import 'package:exif/src/tags_info.dart' show MakerTag, MakerTagFunc, TagsBase;
+import 'package:exif/src/util.dart';
+
+// Makernote (proprietary) tag definitions for FujiFilm.
+// http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/FujiFilm.html
+
+class MakerNoteFujifilm extends TagsBase {
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static MakerTag _withFunc(String name, MakerTagFunc func) =>
+      MakerTag.makeWithFunc(name, func);
+
+  static final tags = {
+    0x0000: _withFunc('NoteVersion', makeString),
+    0x0010: _make('InternalSerialNumber'),
+    0x1000: _make('Quality'),
+    0x1001: _withMap('Sharpness', {
+      0x1: 'Soft',
+      0x2: 'Soft',
+      0x3: 'Normal',
+      0x4: 'Hard',
+      0x5: 'Hard2',
+      0x82: 'Medium Soft',
+      0x84: 'Medium Hard',
+      0x8000: 'Film Simulation'
+    }),
+    0x1002: _withMap('WhiteBalance', {
+      0x0: 'Auto',
+      0x100: 'Daylight',
+      0x200: 'Cloudy',
+      0x300: 'Daylight Fluorescent',
+      0x301: 'Day White Fluorescent',
+      0x302: 'White Fluorescent',
+      0x303: 'Warm White Fluorescent',
+      0x304: 'Living Room Warm White Fluorescent',
+      0x400: 'Incandescent',
+      0x500: 'Flash',
+      0x600: 'Underwater',
+      0xf00: 'Custom',
+      0xf01: 'Custom2',
+      0xf02: 'Custom3',
+      0xf03: 'Custom4',
+      0xf04: 'Custom5',
+      0xff0: 'Kelvin'
+    }),
+    0x1003: _withMap('Saturation', {
+      0x0: 'Normal',
+      0x80: 'Medium High',
+      0x100: 'High',
+      0x180: 'Medium Low',
+      0x200: 'Low',
+      0x300: 'None (B&W)',
+      0x301: 'B&W Red Filter',
+      0x302: 'B&W Yellow Filter',
+      0x303: 'B&W Green Filter',
+      0x310: 'B&W Sepia',
+      0x400: 'Low 2',
+      0x8000: 'Film Simulation'
+    }),
+    0x1004: _withMap('Contrast', {
+      0x0: 'Normal',
+      0x80: 'Medium High',
+      0x100: 'High',
+      0x180: 'Medium Low',
+      0x200: 'Low',
+      0x8000: 'Film Simulation'
+    }),
+    0x1005: _make('ColorTemperature'),
+    0x1006: _withMap('Contrast', {0x0: 'Normal', 0x100: 'High', 0x300: 'Low'}),
+    0x100a: _make('WhiteBalanceFineTune'),
+    0x1010: _withMap(
+        'FlashMode', {0: 'Auto', 1: 'On', 2: 'Off', 3: 'Red Eye Reduction'}),
+    0x1011: _make('FlashStrength'),
+    0x1020: _withMap('Macro', {0: 'Off', 1: 'On'}),
+    0x1021: _withMap('FocusMode', {0: 'Auto', 1: 'Manual'}),
+    0x1022: _withMap('AFPointSet', {0: 'Yes', 1: 'No'}),
+    0x1023: _make('FocusPixel'),
+    0x1030: _withMap('SlowSync', {0: 'Off', 1: 'On'}),
+    0x1031: _withMap('PictureMode', {
+      0: 'Auto',
+      1: 'Portrait',
+      2: 'Landscape',
+      4: 'Sports',
+      5: 'Night',
+      6: 'Program AE',
+      256: 'Aperture Priority AE',
+      512: 'Shutter Priority AE',
+      768: 'Manual Exposure'
+    }),
+    0x1032: _make('ExposureCount'),
+    0x1100: _withMap('MotorOrBracket', {0: 'Off', 1: 'On'}),
+    0x1210:
+        _withMap('ColorMode', {0x0: 'Standard', 0x10: 'Chrome', 0x30: 'B & W'}),
+    0x1300: _withMap('BlurWarning', {0: 'Off', 1: 'On'}),
+    0x1301: _withMap('FocusWarning', {0: 'Off', 1: 'On'}),
+    0x1302: _withMap('ExposureWarning', {0: 'Off', 1: 'On'}),
+  };
+}
diff --git a/exif/lib/src/makernote_nikon.dart b/exif/lib/src/makernote_nikon.dart
new file mode 100644
index 0000000..22eebf5
--- /dev/null
+++ b/exif/lib/src/makernote_nikon.dart
@@ -0,0 +1,286 @@
+import 'package:exif/src/exif_types.dart';
+import 'package:exif/src/tags_info.dart' show MakerTag, MakerTagFunc, TagsBase;
+import 'package:exif/src/util.dart';
+import 'package:sprintf/sprintf.dart' show sprintf;
+
+// Makernote (proprietary) tag definitions for Nikon.
+
+class MakerNoteNikon extends TagsBase {
+  static Map<int, MakerTag> tagsNew = _buildTagsNew();
+  static Map<int, MakerTag> tagsOld = _buildTagsOld();
+
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static MakerTag _withFunc(String name, MakerTagFunc func) =>
+      MakerTag.makeWithFunc(name, func);
+
+  // First digit seems to be in steps of 1/6 EV.
+  // Does the third value mean the step size?  It is usually 6,
+  // but it is 12 for the ExposureDifference.
+  // Check for an error condition that could cause a crash.
+  // This only happens if something has gone really wrong in
+  // reading the Nikon MakerNote.
+  // http://tomtia.plala.jp/DigitalCamera/MakerNote/index.asp
+  static String _evBias(List<int> seq) {
+    if (seq.length < 4) {
+      return '';
+    }
+    if (listEqual(seq, [252, 1, 6, 0])) {
+      return '-2/3 EV';
+    }
+    if (listEqual(seq, [253, 1, 6, 0])) {
+      return '-1/2 EV';
+    }
+    if (listEqual(seq, [254, 1, 6, 0])) {
+      return '-1/3 EV';
+    }
+    if (listEqual(seq, [0, 1, 6, 0])) {
+      return '0 EV';
+    }
+    if (listEqual(seq, [2, 1, 6, 0])) {
+      return '+1/3 EV';
+    }
+    if (listEqual(seq, [3, 1, 6, 0])) {
+      return '+1/2 EV';
+    }
+    if (listEqual(seq, [4, 1, 6, 0])) {
+      return '+2/3 EV';
+    }
+    // Handle combinations not in the table.
+
+    int a = seq[0];
+    String? retStr;
+    // Causes headaches for the +/- logic, so special case it.
+    if (a == 0) {
+      return '0 EV';
+    }
+    if (a > 127) {
+      a = 256 - a;
+      retStr = '-';
+    } else {
+      retStr = '+';
+    }
+
+    final step = seq[2]; // Assume third value means the step size
+    final whole = a ~/ step;
+    a = a % step;
+
+    if (whole != 0) {
+      retStr = sprintf('%s%s ', [retStr, whole.toString()]);
+    }
+
+    if (a == 0) {
+      retStr += 'EV';
+    } else {
+      final r = Ratio(a, step);
+      retStr = '$retStr$r EV';
+    }
+
+    return retStr;
+  }
+
+  // Nikon E99x MakerNote Tags
+  static Map<int, MakerTag> _buildTagsNew() {
+    return {
+      0x0001: _withFunc('MakernoteVersion', makeString), // Sometimes binary
+      0x0002: _make('ISOSetting'),
+      0x0003: _make('ColorMode'),
+      0x0004: _make('Quality'),
+      0x0005: _make('Whitebalance'),
+      0x0006: _make('ImageSharpening'),
+      0x0007: _make('FocusMode'),
+      0x0008: _make('FlashSetting'),
+      0x0009: _make('AutoFlashMode'),
+      0x000B: _make('WhiteBalanceBias'),
+      0x000C: _make('WhiteBalanceRBCoeff'),
+      0x000D: _withFunc('ProgramShift', _evBias),
+      // Nearly the same as the other EV vals, but step size is 1/12 EV []
+      0x000E: _withFunc('ExposureDifference', _evBias),
+      0x000F: _make('ISOSelection'),
+      0x0010: _make('DataDump'),
+      0x0011: _make('NikonPreview'),
+      0x0012: _withFunc('FlashCompensation', _evBias),
+      0x0013: _make('ISOSpeedRequested'),
+      0x0016: _make('PhotoCornerCoordinates'),
+      0x0017: _withFunc('ExternalFlashExposureComp', _evBias),
+      0x0018: _withFunc('FlashBracketCompensationApplied', _evBias),
+      0x0019: _make('AEBracketCompensationApplied'),
+      0x001A: _make('ImageProcessing'),
+      0x001B: _make('CropHiSpeed'),
+      0x001C: _make('ExposureTuning'),
+      0x001D: _make('SerialNumber'), // Conflict with 0x00A0 ?
+      0x001E: _make('ColorSpace'),
+      0x001F: _make('VRInfo'),
+      0x0020: _make('ImageAuthentication'),
+      0x0022: _make('ActiveDLighting'),
+      0x0023: _make('PictureControl'),
+      0x0024: _make('WorldTime'),
+      0x0025: _make('ISOInfo'),
+      0x0080: _make('ImageAdjustment'),
+      0x0081: _make('ToneCompensation'),
+      0x0082: _make('AuxiliaryLens'),
+      0x0083: _make('LensType'),
+      0x0084: _make('LensMinMaxFocalMaxAperture'),
+      0x0085: _make('ManualFocusDistance'),
+      0x0086: _make('DigitalZoomFactor'),
+      0x0087: _withMap('FlashMode', {
+        0x00: 'Did Not Fire',
+        0x01: 'Fired, Manual',
+        0x07: 'Fired, External',
+        0x08: 'Fired, Commander Mode ',
+        0x09: 'Fired, TTL Mode',
+      }),
+      0x0088: _withMap('AFFocusPosition', {
+        0x0000: 'Center',
+        0x0100: 'Top',
+        0x0200: 'Bottom',
+        0x0300: 'Left',
+        0x0400: 'Right',
+      }),
+      0x0089: _withMap('BracketingMode', {
+        0x00: 'Single frame, no bracketing',
+        0x01: 'Continuous, no bracketing',
+        0x02: 'Timer, no bracketing',
+        0x10: 'Single frame, exposure bracketing',
+        0x11: 'Continuous, exposure bracketing',
+        0x12: 'Timer, exposure bracketing',
+        0x40: 'Single frame, white balance bracketing',
+        0x41: 'Continuous, white balance bracketing',
+        0x42: 'Timer, white balance bracketing'
+      }),
+      0x008A: _make('AutoBracketRelease'),
+      0x008B: _make('LensFStops'),
+      0x008C: _make('NEFCurve1'), // ExifTool calls this 'ContrastCurve'
+      0x008D: _make('ColorMode'),
+      0x008F: _make('SceneMode'),
+      0x0090: _make('LightingType'),
+      0x0091: _make('ShotInfo'), // First 4 bytes are a version number in ASCII
+      0x0092: _make('HueAdjustment'),
+      // ExifTool calls this 'NEFCompression', should be 1-4
+      0x0093: _make('Compression'),
+      0x0094: _withMap('Saturation', {
+        -3: 'B&W',
+        -2: '-2',
+        -1: '-1',
+        0: '0',
+        1: '1',
+        2: '2',
+      }),
+      0x0095: _make('NoiseReduction'),
+      0x0096: _make('NEFCurve2'), // ExifTool calls this 'LinearizationTable'
+      0x0097:
+          _make('ColorBalance'), // First 4 bytes are a version number in ASCII
+      0x0098: _make('LensData'), // First 4 bytes are a version number in ASCII
+      0x0099: _make('RawImageCenter'),
+      0x009A: _make('SensorPixelSize'),
+      0x009C: _make('Scene Assist'),
+      0x009E: _make('RetouchHistory'),
+      0x00A0: _make('SerialNumber'),
+      0x00A2: _make('ImageDataSize'),
+      // 00A3: unknown - a single byte 0
+      // 00A4: In NEF, looks like a 4 byte ASCII version number ('0200')
+      0x00A5: _make('ImageCount'),
+      0x00A6: _make('DeletedImageCount'),
+      0x00A7: _make('TotalShutterReleases'),
+      // First 4 bytes are a version number in ASCII, with version specific
+      // info to follow.  Its hard to treat it as a string due to embedded nulls.
+      0x00A8: _make('FlashInfo'),
+      0x00A9: _make('ImageOptimization'),
+      0x00AA: _make('Saturation'),
+      0x00AB: _make('DigitalVariProgram'),
+      0x00AC: _make('ImageStabilization'),
+      0x00AD: _make('AFResponse'),
+      0x00B0: _make('MultiExposure'),
+      0x00B1: _make('HighISONoiseReduction'),
+      0x00B6: _make('PowerUpTime'),
+      0x00B7: _make('AFInfo2'),
+      0x00B8: _make('FileInfo'),
+      0x00B9: _make('AFTune'),
+      0x0100: _make('DigitalICE'),
+      0x0103: _withMap('PreviewCompression', {
+        1: 'Uncompressed',
+        2: 'CCITT 1D',
+        3: 'T4/Group 3 Fax',
+        4: 'T6/Group 4 Fax',
+        5: 'LZW',
+        6: 'JPEG (old-style)',
+        7: 'JPEG',
+        8: 'Adobe Deflate',
+        9: 'JBIG B&W',
+        10: 'JBIG Color',
+        32766: 'Next',
+        32769: 'Epson ERF Compressed',
+        32771: 'CCIRLEW',
+        32773: 'PackBits',
+        32809: 'Thunderscan',
+        32895: 'IT8CTPAD',
+        32896: 'IT8LW',
+        32897: 'IT8MP',
+        32898: 'IT8BL',
+        32908: 'PixarFilm',
+        32909: 'PixarLog',
+        32946: 'Deflate',
+        32947: 'DCS',
+        34661: 'JBIG',
+        34676: 'SGILog',
+        34677: 'SGILog24',
+        34712: 'JPEG 2000',
+        34713: 'Nikon NEF Compressed',
+        65000: 'Kodak DCR Compressed',
+        65535: 'Pentax PEF Compressed',
+      }),
+      0x0201: _make('PreviewImageStart'),
+      0x0202: _make('PreviewImageLength'),
+      0x0213: _withMap('PreviewYCbCrPositioning', {
+        1: 'Centered',
+        2: 'Co-sited',
+      }),
+      0x0E09: _make('NikonCaptureVersion'),
+      0x0E0E: _make('NikonCaptureOffsets'),
+      0x0E10: _make('NikonScan'),
+      0x0E22: _make('NEFBitDepth'),
+    };
+  }
+
+  static Map<int, MakerTag> _buildTagsOld() {
+    return {
+      0x0003: _withMap('Quality', {
+        1: 'VGA Basic',
+        2: 'VGA Normal',
+        3: 'VGA Fine',
+        4: 'SXGA Basic',
+        5: 'SXGA Normal',
+        6: 'SXGA Fine',
+      }),
+      0x0004: _withMap('ColorMode', {
+        1: 'Color',
+        2: 'Monochrome',
+      }),
+      0x0005: _withMap('ImageAdjustment', {
+        0: 'Normal',
+        1: 'Bright+',
+        2: 'Bright-',
+        3: 'Contrast+',
+        4: 'Contrast-',
+      }),
+      0x0006: _withMap('CCDSpeed', {
+        0: 'ISO 80',
+        2: 'ISO 160',
+        4: 'ISO 320',
+        5: 'ISO 100',
+      }),
+      0x0007: _withMap('WhiteBalance', {
+        0: 'Auto',
+        1: 'Preset',
+        2: 'Daylight',
+        3: 'Incandescent',
+        4: 'Fluorescent',
+        5: 'Cloudy',
+        6: 'Speed Light',
+      }),
+    };
+  }
+}
diff --git a/exif/lib/src/makernote_olympus.dart b/exif/lib/src/makernote_olympus.dart
new file mode 100644
index 0000000..0f350d3
--- /dev/null
+++ b/exif/lib/src/makernote_olympus.dart
@@ -0,0 +1,287 @@
+import 'package:exif/src/tags_info.dart' show MakerTag, MakerTagFunc, TagsBase;
+import 'package:exif/src/util.dart';
+import 'package:sprintf/sprintf.dart' show sprintf;
+
+// Makernote (proprietary) tag definitions for olympus.
+
+class MakerNoteOlympus extends TagsBase {
+  static Map<int, MakerTag> tags = _buildTags();
+
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static MakerTag _withFunc(String name, MakerTagFunc func) =>
+      MakerTag.makeWithFunc(name, func);
+
+  // decode Olympus SpecialMode tag in MakerNote
+  static String _specialMode(List<int> v) {
+    final Map<int, String> mode1 = {
+      0: 'Normal',
+      1: 'Unknown',
+      2: 'Fast',
+      3: 'Panorama',
+    };
+    final Map<int, String> mode2 = {
+      0: 'Non-panoramic',
+      1: 'Left to right',
+      2: 'Right to left',
+      3: 'Bottom to top',
+      4: 'Top to bottom',
+    };
+
+    if (v.isEmpty) {
+      return '';
+    }
+
+    if (v.length < 3 ||
+        (!mode1.containsKey(v[0]) || !mode2.containsKey(v[2]))) {
+      return v.toString();
+    }
+
+    return sprintf('%s - sequence %d - %s', [mode1[v[0]], v[1], mode2[v[2]]]);
+  }
+
+  static Map<int, MakerTag> _buildTags() {
+    return {
+      // ah HAH! those sneeeeeaky bastids! this is how they get past the fact
+      // that a JPEG thumbnail is not allowed in an uncompressed TIFF file
+      0x0100: _make('JPEGThumbnail'),
+      0x0200: _withFunc('SpecialMode', _specialMode),
+      0x0201: _withMap('JPEGQual', {
+        1: 'SQ',
+        2: 'HQ',
+        3: 'SHQ',
+      }),
+      0x0202: _withMap('Macro', {0: 'Normal', 1: 'Macro', 2: 'SuperMacro'}),
+      0x0203: _withMap('BWMode', {0: 'Off', 1: 'On'}),
+      0x0204: _make('DigitalZoom'),
+      0x0205: _make('FocalPlaneDiagonal'),
+      0x0206: _make('LensDistortionParams'),
+      0x0207: _make('SoftwareRelease'),
+      0x0208: _make('PictureInfo'),
+      0x0209: _withFunc('CameraID', makeString),
+      // print as string
+      0x0F00: _make('DataDump'),
+      0x0300: _make('PreCaptureFrames'),
+      0x0404: _make('SerialNumber'),
+      0x1000: _make('ShutterSpeedValue'),
+      0x1001: _make('ISOValue'),
+      0x1002: _make('ApertureValue'),
+      0x1003: _make('BrightnessValue'),
+      0x1004: _withMap('FlashMode', {2: 'On', 3: 'Off'}),
+      0x1005: _withMap('FlashDevice',
+          {0: 'None', 1: 'Internal', 4: 'External', 5: 'Internal + External'}),
+      0x1006: _make('ExposureCompensation'),
+      0x1007: _make('SensorTemperature'),
+      0x1008: _make('LensTemperature'),
+      0x100b: _withMap('FocusMode', {0: 'Auto', 1: 'Manual'}),
+      0x1017: _make('RedBalance'),
+      0x1018: _make('BlueBalance'),
+      0x101a: _make('SerialNumber'),
+      0x1023: _make('FlashExposureComp'),
+      0x1026: _withMap('ExternalFlashBounce', {0: 'No', 1: 'Yes'}),
+      0x1027: _make('ExternalFlashZoom'),
+      0x1028: _make('ExternalFlashMode'),
+      0x1029: _withMap('Contrast  int16u', {0: 'High', 1: 'Normal', 2: 'Low'}),
+      0x102a: _make('SharpnessFactor'),
+      0x102b: _make('ColorControl'),
+      0x102c: _make('ValidBits'),
+      0x102d: _make('CoringFilter'),
+      0x102e: _make('OlympusImageWidth'),
+      0x102f: _make('OlympusImageHeight'),
+      0x1034: _make('CompressionRatio'),
+      0x1035: _withMap('PreviewImageValid', {0: 'No', 1: 'Yes'}),
+      0x1036: _make('PreviewImageStart'),
+      0x1037: _make('PreviewImageLength'),
+      0x1039: _withMap('CCDScanMode', {0: 'Interlaced', 1: 'Progressive'}),
+      0x103a: _withMap('NoiseReduction', {0: 'Off', 1: 'On'}),
+      0x103b: _make('InfinityLensStep'),
+      0x103c: _make('NearLensStep'),
+
+      // TODO - these need extra definitions
+      // http://search.cpan.org/src/EXIFTOOL/Image-ExifTool-6.90/html/TagNames/Olympus.html
+      0x2010: _make('Equipment'),
+      0x2020: _make('CameraSettings'),
+      0x2030: _make('RawDevelopment'),
+      0x2040: _make('ImageProcessing'),
+      0x2050: _make('FocusInfo'),
+      0x3000: _make('RawInfo '),
+    };
+  }
+}
+
+/*
+  // 0x2020 CameraSettings
+  static Map<int,List> TAG_0x2020 = {
+      0x0100: ['PreviewImageValid', {
+          0: 'No',
+          1: 'Yes'
+      }],
+      0x0101: ['PreviewImageStart', ],
+      0x0102: ['PreviewImageLength', ],
+      0x0200: ['ExposureMode', {
+          1: 'Manual',
+          2: 'Program',
+          3: 'Aperture-priority AE',
+          4: 'Shutter speed priority AE',
+          5: 'Program-shift'
+      }],
+      0x0201: ['AELock', {
+          0: 'Off',
+          1: 'On'
+      }],
+      0x0202: ['MeteringMode', {
+          2: 'Center Weighted',
+          3: 'Spot',
+          5: 'ESP',
+          261: 'Pattern+AF',
+          515: 'Spot+Highlight control',
+          1027: 'Spot+Shadow control'
+      }],
+      0x0300: ['MacroMode', {
+          0: 'Off',
+          1: 'On'
+      }],
+      0x0301: ['FocusMode', {
+          0: 'Single AF',
+          1: 'Sequential shooting AF',
+          2: 'Continuous AF',
+          3: 'Multi AF',
+          10: 'MF'
+      }],
+      0x0302: ['FocusProcess', {
+          0: 'AF Not Used',
+          1: 'AF Used'
+      }],
+      0x0303: ['AFSearch', {
+          0: 'Not Ready',
+          1: 'Ready'
+      }],
+      0x0304: ['AFAreas', ],
+      0x0401: ['FlashExposureCompensation', ],
+      0x0500: ['WhiteBalance2', {
+          0: 'Auto',
+          16: '7500K (Fine Weather with Shade)',
+          17: '6000K (Cloudy)',
+          18: '5300K (Fine Weather)',
+          20: '3000K (Tungsten light)',
+          21: '3600K (Tungsten light-like)',
+          33: '6600K (Daylight fluorescent)',
+          34: '4500K (Neutral white fluorescent)',
+          35: '4000K (Cool white fluorescent)',
+          48: '3600K (Tungsten light-like)',
+          256: 'Custom WB 1',
+          257: 'Custom WB 2',
+          258: 'Custom WB 3',
+          259: 'Custom WB 4',
+          512: 'Custom WB 5400K',
+          513: 'Custom WB 2900K',
+          514: 'Custom WB 8000K',
+      }],
+      0x0501: ['WhiteBalanceTemperature', ],
+      0x0502: ['WhiteBalanceBracket', ],
+      0x0503: ['CustomSaturation', ],  // (3 numbers: 1. CS Value, 2. Min, 3. Max)
+      0x0504: ['ModifiedSaturation', {
+          0: 'Off',
+          1: 'CM1 (Red Enhance)',
+          2: 'CM2 (Green Enhance)',
+          3: 'CM3 (Blue Enhance)',
+          4: 'CM4 (Skin Tones)',
+      }],
+      0x0505: ['ContrastSetting', ],  // (3 numbers: 1. Contrast, 2. Min, 3. Max)
+      0x0506: ['SharpnessSetting', ],  // (3 numbers: 1. Sharpness, 2. Min, 3. Max)
+      0x0507: ['ColorSpace', {
+          0: 'sRGB',
+          1: 'Adobe RGB',
+          2: 'Pro Photo RGB'
+      }],
+      0x0509: ['SceneMode', {
+          0: 'Standard',
+          6: 'Auto',
+          7: 'Sport',
+          8: 'Portrait',
+          9: 'Landscape+Portrait',
+          10: 'Landscape',
+          11: 'Night scene',
+          13: 'Panorama',
+          16: 'Landscape+Portrait',
+          17: 'Night+Portrait',
+          19: 'Fireworks',
+          20: 'Sunset',
+          22: 'Macro',
+          25: 'Documents',
+          26: 'Museum',
+          28: 'Beach&Snow',
+          30: 'Candle',
+          35: 'Underwater Wide1',
+          36: 'Underwater Macro',
+          39: 'High Key',
+          40: 'Digital Image Stabilization',
+          44: 'Underwater Wide2',
+          45: 'Low Key',
+          46: 'Children',
+          48: 'Nature Macro',
+      }],
+      0x050a: ['NoiseReduction', {
+          0: 'Off',
+          1: 'Noise Reduction',
+          2: 'Noise Filter',
+          3: 'Noise Reduction + Noise Filter',
+          4: 'Noise Filter (ISO Boost)',
+          5: 'Noise Reduction + Noise Filter (ISO Boost)'
+      }],
+      0x050b: ['DistortionCorrection', {
+          0: 'Off',
+          1: 'On'
+      }],
+      0x050c: ['ShadingCompensation', {
+          0: 'Off',
+          1: 'On'
+      }],
+      0x050d: ['CompressionFactor', ],
+      0x050f: ['Gradation', {
+          '-1 -1 1': 'Low Key',
+          '0 -1 1': 'Normal',
+          '1 -1 1': 'High Key'
+      }],
+      0x0520: ['PictureMode', {
+          1: 'Vivid',
+          2: 'Natural',
+          3: 'Muted',
+          256: 'Monotone',
+          512: 'Sepia'
+      }],
+      0x0521: ['PictureModeSaturation', ],
+      0x0522: ['PictureModeHue?', ],
+      0x0523: ['PictureModeContrast', ],
+      0x0524: ['PictureModeSharpness', ],
+      0x0525: ['PictureModeBWFilter', {
+          0: 'n/a',
+          1: 'Neutral',
+          2: 'Yellow',
+          3: 'Orange',
+          4: 'Red',
+          5: 'Green'
+      }],
+      0x0526: ['PictureModeTone', {
+          0: 'n/a',
+          1: 'Neutral',
+          2: 'Sepia',
+          3: 'Blue',
+          4: 'Purple',
+          5: 'Green'
+      }],
+      0x0600: ['Sequence', ],  // 2 or 3 numbers: 1. Mode, 2. Shot number, 3. Mode bits
+      0x0601: ['PanoramaMode', ],  // (2 numbers: 1. Mode, 2. Shot number)
+      0x0603: ['ImageQuality2', {
+          1: 'SQ',
+          2: 'HQ',
+          3: 'SHQ',
+          4: 'RAW',
+      }],
+      0x0901: ['ManometerReading', ],
+  };
+
+*/
diff --git a/exif/lib/src/print_exif.dart b/exif/lib/src/print_exif.dart
new file mode 100644
index 0000000..b201bbd
--- /dev/null
+++ b/exif/lib/src/print_exif.dart
@@ -0,0 +1,38 @@
+import 'package:exif/src/file_interface.dart';
+import 'package:exif/src/read_exif.dart';
+
+Future<String> printExifOfBytes(List<int> bytes,
+    {String? stopTag,
+    bool details = true,
+    bool strict = false,
+    bool debug = false}) async {
+  final data =
+      readExifFromFileReader(FileReader.fromBytes(bytes), stopTag: stopTag);
+
+  if (data.tags.isEmpty) {
+    return "No EXIF information found";
+  }
+
+  final prints = [];
+
+  // prints.addAll(data.warnings);
+
+  if (data.tags.containsKey('JPEGThumbnail')) {
+    prints.add('File has JPEG thumbnail');
+    data.tags.remove('JPEGThumbnail');
+  }
+  if (data.tags.containsKey('TIFFThumbnail')) {
+    prints.add('File has TIFF thumbnail');
+    data.tags.remove('TIFFThumbnail');
+  }
+
+  final tagKeys = data.tags.keys.toList();
+  tagKeys.sort();
+
+  for (final key in tagKeys) {
+    final tag = data.tags[key];
+    prints.add("$key (${tag!.tagType}): $tag");
+  }
+
+  return prints.join("\n");
+}
diff --git a/exif/lib/src/read_exif.dart b/exif/lib/src/read_exif.dart
new file mode 100644
index 0000000..0422231
--- /dev/null
+++ b/exif/lib/src/read_exif.dart
@@ -0,0 +1,459 @@
+import 'dart:async';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:exif/src/exif_decode_makernote.dart';
+import 'package:exif/src/exif_types.dart';
+import 'package:exif/src/exifheader.dart';
+import 'package:exif/src/file_interface.dart';
+import 'package:exif/src/heic.dart';
+import 'package:exif/src/linereader.dart';
+import 'package:exif/src/reader.dart';
+import 'package:exif/src/util.dart';
+
+int _incrementBase(List<int> data, int base) {
+  return (data[base + 2]) * 256 + (data[base + 3]) + 2;
+}
+
+/// Process an image file data.
+/// This is the function that has to deal with all the arbitrary nasty bits
+/// of the EXIF standard.
+Future<Map<String, IfdTag>> readExifFromBytes(List<int> bytes,
+    {String? stopTag,
+    bool details = true,
+    bool strict = false,
+    bool debug = false,
+    bool truncateTags = true}) async {
+  return readExifFromFileReader(FileReader.fromBytes(bytes),
+          stopTag: stopTag,
+          details: details,
+          strict: strict,
+          debug: debug,
+          truncateTags: truncateTags)
+      .tags;
+}
+
+/// Streaming version of [readExifFromBytes].
+Future<Map<String, IfdTag>> readExifFromFile(File file,
+    {String? stopTag,
+    bool details = true,
+    bool strict = false,
+    bool debug = false,
+    bool truncateTags = true}) async {
+  final randomAccessFile = file.openSync();
+  final fileReader = await FileReader.fromFile(randomAccessFile);
+  final r = readExifFromFileReader(fileReader,
+      stopTag: stopTag,
+      details: details,
+      strict: strict,
+      debug: debug,
+      truncateTags: truncateTags);
+  randomAccessFile.closeSync();
+  return r.tags;
+}
+
+/// Process an image file (expects an open file object).
+/// This is the function that has to deal with all the arbitrary nasty bits
+/// of the EXIF standard.
+ExifData readExifFromFileReader(FileReader f,
+    {String? stopTag,
+    bool details = true,
+    bool strict = false,
+    bool debug = false,
+    bool truncateTags = true}) {
+  ReadParams readParams;
+
+  // determine whether it's a JPEG or TIFF
+  final header = f.readSync(12);
+  if (_isTiff(header)) {
+    readParams = _tiffReadParams(f);
+  } else if (_isHeic(header) || _isAvif(header)) {
+    readParams = _heicReadParams(f);
+  } else if (_isJpeg(header)) {
+    readParams = _jpegReadParams(f);
+  } else if (_isPng(header)) {
+    readParams = _pngReadParams(f);
+  } else if (_isWebp(header)) {
+    readParams = _webpReadParams(f);
+  } else {
+    return ExifData.withWarning("File format not recognized.");
+  }
+
+  if (readParams.error != "") {
+    return ExifData.withWarning(readParams.error);
+  }
+
+  final file = IfdReader(Reader(f, readParams.offset, readParams.endian),
+      fakeExif: readParams.fakeExif);
+
+  final hdr = ExifHeader(
+      file: file,
+      strict: strict,
+      debug: debug,
+      detailed: details,
+      truncateTags: truncateTags);
+
+  final ifdList = file.listIfd();
+
+  ifdList.asMap().forEach((ifdIndex, ifd) {
+    hdr.dumpIfd(ifd, _ifdNameOfIndex(ifdIndex), stopTag: stopTag);
+  });
+
+  // EXIF IFD
+  final exifOff = hdr.tags['Image ExifOffset'];
+  if (exifOff != null && exifOff.tag.values is IfdInts) {
+    hdr.dumpIfd(exifOff.tag.values.firstAsInt(), 'EXIF', stopTag: stopTag);
+  }
+
+  if (details) {
+    DecodeMakerNote(hdr.tags, hdr.file, hdr.dumpIfd).decode();
+  }
+
+  if (details && ifdList.length >= 2) {
+    hdr.extractTiffThumbnail(ifdList[1]);
+    hdr.extractJpegThumbnail();
+  }
+
+  // parse XMP tags (experimental)
+  if (debug && details) {
+    _parseXmpTags(f, hdr);
+  }
+
+  return ExifData(
+      hdr.tags.map((key, value) => MapEntry(key, value.tag)), hdr.warnings);
+}
+
+String _ifdNameOfIndex(int index) {
+  if (index == 0) {
+    return 'Image';
+  } else if (index == 1) {
+    return 'Thumbnail';
+  } else {
+    return 'IFD $index';
+  }
+}
+
+void _parseXmpTags(FileReader f, ExifHeader hdr) {
+  String xmpString = '';
+  // Easy we already have them
+  final imageApplicationNotes = hdr.tags['Image ApplicationNotes'];
+  if (imageApplicationNotes != null) {
+    // XMP present in Exif
+    final tag = imageApplicationNotes.tag;
+    xmpString =
+        (tag is IfdInts) ? makeString((tag as IfdInts).ints) : tag.toString();
+    // We need to look in the entire file for the XML
+  } else {
+    // XMP not in Exif, searching file for XMP info...
+    bool xmlStarted = false;
+    bool xmlFinished = false;
+    final reader = LineReader(f);
+    while (true) {
+      String line = reader.readLine();
+      if (line.isEmpty) break;
+
+      final openTag = line.indexOf('<x:xmpmeta');
+      final closeTag = line.indexOf('</x:xmpmeta>');
+
+      if (openTag != -1) {
+        xmlStarted = true;
+        line = line.substring(openTag);
+        // printf('** XMP found opening tag at line position %s', [open_tag]);
+      }
+
+      if (closeTag != -1) {
+        // printf('** XMP found closing tag at line position %s', [close_tag]);
+        int lineOffset = 0;
+        if (openTag != -1) {
+          lineOffset = openTag;
+        }
+        line = line.substring(0, (closeTag - lineOffset) + 12);
+        xmlFinished = true;
+      }
+
+      if (xmlStarted) {
+        xmpString += line;
+      }
+
+      if (xmlFinished) {
+        break;
+      }
+    }
+
+    // print('** XMP Finished searching for info');
+    if (xmpString.isNotEmpty) {
+      hdr.parseXmp(xmpString);
+    }
+  }
+}
+
+bool _isTiff(List<int> header) =>
+    header.length >= 4 &&
+    listContainedIn(
+        header.sublist(0, 4), ['II*\x00'.codeUnits, 'MM\x00*'.codeUnits]);
+
+bool _isHeic(List<int> header) =>
+    listRangeEqual(header, 4, 12, 'ftypheic'.codeUnits);
+
+bool _isAvif(List<int> header) =>
+    listRangeEqual(header, 4, 12, 'ftypavif'.codeUnits);
+
+bool _isJpeg(List<int> header) =>
+    listRangeEqual(header, 0, 2, '\xFF\xD8'.codeUnits);
+
+bool _isPng(List<int> header) =>
+    listRangeEqual(header, 0, 8, '\x89PNG\r\n\x1a\n'.codeUnits);
+
+bool _isWebp(List<int> header) =>
+    listRangeEqual(header, 0, 4, 'RIFF'.codeUnits) &&
+    listRangeEqual(header, 8, 12, 'WEBP'.codeUnits);
+
+ReadParams _heicReadParams(FileReader f) {
+  f.setPositionSync(0);
+  final heic = HEICExifFinder(f);
+  final res = heic.findExif();
+  if (res.length != 2) {
+    return ReadParams.error("Possibly corrupted heic data");
+  }
+  final int offset = res[0];
+  final Endian endian = Reader.endianOfByte(res[1]);
+  return ReadParams(endian: endian, offset: offset);
+}
+
+ReadParams _jpegReadParams(FileReader f) {
+  // by default do not fake an EXIF beginning
+  var fakeExif = false;
+  int offset;
+  Endian endian;
+
+  f.setPositionSync(0);
+
+  const headerLength = 12;
+  var data = f.readSync(headerLength);
+  if (data.length != headerLength) {
+    return ReadParams.error("File format not recognized.");
+  }
+
+  var base = 2;
+  while (data[2] == 0xFF &&
+      listContainedIn(data.sublist(6, 10), [
+        'JFIF'.codeUnits,
+        'JFXX'.codeUnits,
+        'OLYM'.codeUnits,
+        'Phot'.codeUnits
+      ])) {
+    final length = data[4] * 256 + data[5];
+    // printf("** Length offset is %d", [length]);
+    f.readSync(length - 8);
+    // fake an EXIF beginning of file
+    // I don't think this is used. --gd
+    data = [0xFF, 0x00];
+    data.addAll(f.readSync(10));
+    fakeExif = true;
+    if (base > 2) {
+      // print("** Added to base");
+      base = base + length + 4 - 2;
+    } else {
+      // print("** Added to zero");
+      base = length + 4;
+    }
+    // printf("** Set segment base to 0x%X", [base]);
+  }
+
+  // Big ugly patch to deal with APP2 (or other) data coming before APP1
+  f.setPositionSync(0);
+  // in theory, this could be insufficient since 64K is the maximum size--gd
+  // print('** f.position=${f.positionSync()}, base=$base');
+  data = f.readSync(base + 4000);
+  // print('** data.length=${data.length}');
+
+  // base = 2
+  while (true) {
+    // print('** base=$base');
+
+    // if (data.length == 4020) {
+    //   print("**  data.length=${data.length}, base=$base");
+    // }
+    if (listRangeEqual(data, base, base + 2, [0xFF, 0xE1])) {
+      // APP1
+      // print("**   APP1 at base $base");
+      // print("**   Length: (${data[base + 2]}, ${data[base + 3]})");
+      // print("**   Code: ${new String.fromCharCodes(data.sublist(base + 4,base + 8))}");
+      if (listRangeEqual(data, base + 4, base + 8, "Exif".codeUnits)) {
+        // print("**  Decrement base by 2 to get to pre-segment header (for compatibility with later code)");
+        base -= 2;
+        break;
+      }
+      base += _incrementBase(data, base);
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xE0])) {
+      // APP0
+      // print("**  APP0 at base $base");
+      // printf("**  Length: 0x%X 0x%X", [data[base + 2], data[base + 3]]);
+      // printf("**  Code: %s", [data.sublist(base + 4, base + 8)]);
+      base += _incrementBase(data, base);
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xE2])) {
+      // APP2
+      // printf("**  APP2 at base 0x%X", [base]);
+      // printf("**  Length: 0x%X 0x%X", [data[base + 2], data[base + 3]]);
+      // printf("** Code: %s", [data.sublist(base + 4,base + 8)]);
+      base += _incrementBase(data, base);
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xEE])) {
+      // APP14
+      // printf("**  APP14 Adobe segment at base 0x%X", [base]);
+      // printf("**  Length: 0x%X 0x%X", [data[base + 2], data[base + 3]]);
+      // printf("**  Code: %s", [data.sublist(base + 4,base + 8)]);
+      base += _incrementBase(data, base);
+      // print("**  There is useful EXIF-like data here, but we have no parser for it.");
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xDB])) {
+      // printf("**  JPEG image data at base 0x%X No more segments are expected.", [base]);
+      break;
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xD8])) {
+      // APP12
+      // printf("**  FFD8 segment at base 0x%X", [base]);
+      // printf("**  Got 0x%X 0x%X and %s instead", [data[base], data[base + 1], data.sublist(4 + base,10 + base)]);
+      // printf("**  Length: 0x%X 0x%X", [data[base + 2], data[base + 3]]);
+      // printf("**  Code: %s", [data.sublist(base + 4,base + 8)]);
+      base += _incrementBase(data, base);
+    } else if (listRangeEqual(data, base, base + 2, [0xFF, 0xEC])) {
+      // APP12
+      // printf("**  APP12 XMP (Ducky) or Pictureinfo segment at base 0x%X", [base]);
+      // printf("**  Got 0x%X and 0x%X instead", [data[base], data[base + 1]]);
+      // printf("**  Length: 0x%X 0x%X", [data[base + 2], data[base + 3]]);
+      // printf("** Code: %s", [data.sublist(base + 4,base + 8)]);
+      base += _incrementBase(data, base);
+      // print("**  There is useful EXIF-like data here (quality, comment, copyright), but we have no parser for it.");
+    } else {
+      try {
+        base += _incrementBase(data, base);
+      } on RangeError {
+        return ReadParams.error(
+            "Unexpected/unhandled segment type or file content.");
+      }
+    }
+  }
+
+  f.setPositionSync(base + 12);
+  if (data[2 + base] == 0xFF &&
+      listRangeEqual(data, 6 + base, 10 + base, 'Exif'.codeUnits)) {
+    // detected EXIF header
+    offset = f.positionSync();
+    endian = Reader.endianOfByte(f.readByteSync());
+    //HACK TEST:  endian = 'M'
+  } else if (data[2 + base] == 0xFF &&
+      listRangeEqual(data, 6 + base, 10 + base + 1, 'Ducky'.codeUnits)) {
+    // detected Ducky header.
+    // printf("** EXIF-like header (normally 0xFF and code): 0x%X and %s",
+    //              [data[2 + base], data.sublist(6 + base,10 + base + 1)]);
+    offset = f.positionSync();
+    endian = Reader.endianOfByte(f.readByteSync());
+  } else if (data[2 + base] == 0xFF &&
+      listRangeEqual(data, 6 + base, 10 + base + 1, 'Adobe'.codeUnits)) {
+    // detected APP14 (Adobe);
+    // printf("** EXIF-like header (normally 0xFF and code): 0x%X and %s",
+    //              [data[2 + base], data.sublist(6 + base,10 + base + 1)]);
+    offset = f.positionSync();
+    endian = Reader.endianOfByte(f.readByteSync());
+  } else {
+    // print("** No EXIF header expected data[2+base]==0xFF and data[6+base:10+base]===Exif (or Duck)");
+    // printf("** Did get 0x%X and %s",
+    //              [data[2 + base], data.sublist(6 + base,10 + base + 1)]);
+    return ReadParams.error("No EXIF information found");
+  }
+
+  return ReadParams(endian: endian, offset: offset, fakeExif: fakeExif);
+}
+
+ReadParams _pngReadParams(FileReader f) {
+  f.setPositionSync(8);
+  while (true) {
+    final data = f.readSync(8);
+    final chunk = String.fromCharCodes(data.sublist(4, 8));
+
+    if (chunk.isEmpty || chunk == "IEND") {
+      break;
+    }
+    if (chunk == "eXIf") {
+      final offset = f.positionSync();
+      final endian = Reader.endianOfByte(f.readByteSync());
+      return ReadParams(endian: endian, offset: offset);
+    }
+
+    final chunkSize =
+        Int8List.fromList(data.sublist(0, 4)).buffer.asByteData().getInt32(0);
+    f.setPositionSync(f.positionSync() + chunkSize + 4);
+  }
+
+  return ReadParams.error("No EXIF information found");
+}
+
+ReadParams _webpReadParams(FileReader f) {
+  // Each RIFF box is a 4-byte ASCII tag, followed by a little-endian uint32
+  // length, and  finally that number of bytes of data. The file starts with an
+  // outer box with the tag 'RIFF', whose content is the file format ('WEBP')
+  // followed by a series of inner boxes. We need the inner 'EXIF' box.
+  //
+  // The outer box encapsulates the entire file, so we can safely skip forward
+  // to the first inner box.
+  f.setPositionSync(12);
+  while (true) {
+    final header = f.readSync(8);
+    if (header.isEmpty) {
+      return ReadParams.error("No EXIF information found");
+    } else if (header.length < 8) {
+      return ReadParams.error("Invalid RIFF encoding");
+    }
+
+    final tag = String.fromCharCodes(header.sublist(0, 4));
+    final length = Int8List.fromList(header.sublist(4, 8))
+        .buffer
+        .asByteData()
+        .getInt32(0, Endian.little);
+
+    // According to exiftool's RIFF documentation, WebP uses "EXIF" as tag
+    // name while other RIFF-based files tend to use "Exif".
+    if (tag == "EXIF") {
+      // Look for Exif\x00\x00, and skip it if present. The WebP implementation
+      // in Exiv2 also handles a \xFF\x01\xFF\xE1\x00\x00 prefix, but with no
+      // explanation or test file present, so we ignore that for now.
+      final exifHeader = f.readSync(6);
+      if (!listEqual(
+          exifHeader, Uint8List.fromList('Exif\x00\x00'.codeUnits))) {
+        // There was no Exif\x00\x00 marker, rewind
+        f.setPositionSync(f.positionSync() - exifHeader.length);
+      }
+
+      final offset = f.positionSync();
+      final endian = Reader.endianOfByte(f.readByteSync());
+      return ReadParams(endian: endian, offset: offset);
+    }
+
+    // Skip forward to the next box.
+    f.setPositionSync(f.positionSync() + length);
+  }
+}
+
+ReadParams _tiffReadParams(FileReader f) {
+  f.setPositionSync(0);
+  final endian = Reader.endianOfByte(f.readByteSync());
+  f.readSync(1);
+  return ReadParams(endian: endian, offset: 0);
+}
+
+class ReadParams {
+  final bool fakeExif;
+  final Endian endian;
+  final int offset;
+  final String error;
+
+  ReadParams({
+    required this.endian,
+    required this.offset,
+    // by default do not fake an EXIF beginning
+    this.fakeExif = false,
+  }) : error = "";
+
+  ReadParams.error(this.error)
+      : endian = Endian.little,
+        offset = 0,
+        fakeExif = false;
+}
diff --git a/exif/lib/src/reader.dart b/exif/lib/src/reader.dart
new file mode 100644
index 0000000..abf5dfe
--- /dev/null
+++ b/exif/lib/src/reader.dart
@@ -0,0 +1,251 @@
+import 'dart:typed_data';
+
+import 'package:exif/src/exif_types.dart';
+import 'package:exif/src/field_types.dart';
+import 'package:exif/src/file_interface.dart';
+import 'package:exif/src/makernote_canon.dart';
+import 'package:exif/src/util.dart';
+
+class Reader {
+  FileReader file;
+  int baseOffset;
+  Endian endian;
+
+  Reader(this.file, this.baseOffset, this.endian);
+
+  List<int> readSlice(int relativePos, int length) {
+    file.setPositionSync(baseOffset + relativePos);
+    return file.readSync(length);
+  }
+
+  // Convert slice to integer, based on sign and endian flags.
+  // Usually this offset is assumed to be relative to the beginning of the
+  // start of the EXIF information.
+  // For some cameras that use relative tags, this offset may be relative
+  // to some other starting point.
+  int readInt(int offset, int length, {bool signed = false}) {
+    final sliced = readSlice(offset, length);
+    int val;
+
+    if (endian == Endian.little) {
+      val = s2nLittleEndian(sliced, signed: signed);
+    } else {
+      val = s2nBigEndian(sliced, signed: signed);
+    }
+
+    return val;
+  }
+
+  Ratio readRatio(int offset, {required bool signed}) {
+    final n = readInt(offset, 4, signed: signed);
+    final d = readInt(offset + 4, 4, signed: signed);
+    return Ratio(n, d);
+  }
+
+  // Convert offset to string.
+  List<int> offsetToBytes(int readOffset, int length) {
+    final List<int> s = [];
+    for (int dummy = 0; dummy < length; dummy++) {
+      if (endian == Endian.little) {
+        s.add(readOffset & 0xFF);
+      } else {
+        s.insert(0, readOffset & 0xFF);
+      }
+      readOffset = readOffset >> 8;
+    }
+    return s;
+  }
+
+  static Endian endianOfByte(int b) {
+    if (b == 'I'.codeUnitAt(0)) {
+      return Endian.little;
+    }
+    return Endian.big;
+  }
+}
+
+class IfdReader {
+  Reader file;
+  final bool fakeExif;
+
+  IfdReader(this.file, {required this.fakeExif});
+
+  // Return first IFD.
+  int _firstIfd() => file.readInt(4, 4);
+
+  // Return the pointer to next IFD.
+  int _nextIfd(int ifd) {
+    final entries = file.readInt(ifd, 2);
+    final nextIfd = file.readInt(ifd + 2 + 12 * entries, 4);
+    if (nextIfd == ifd) {
+      return 0;
+    } else {
+      return nextIfd;
+    }
+  }
+
+  // Return the list of IFDs in the header.
+  List<int> listIfd() {
+    int i = _firstIfd();
+    final List<int> ifds = [];
+    while (i > 0) {
+      ifds.add(i);
+      i = _nextIfd(i);
+    }
+    return ifds;
+  }
+
+  List<IfdEntry> readIfdEntries(int ifd, {required bool relative}) {
+    final numEntries = file.readInt(ifd, 2);
+
+    return List<IfdEntry>.generate(numEntries, (i) {
+      // entry is index of start of this IFD in the file
+      final offset = ifd + 2 + 12 * i;
+      final tag = file.readInt(offset, 2);
+      final fieldType = FieldType.ofValue(file.readInt(offset + 2, 2));
+      final count = file.readInt(offset + 4, 4);
+
+      final typeLength = fieldType.length;
+
+      // Adjust for tag id/type/count (2+2+4 bytes)
+      // Now we point at either the data or the 2nd level offset
+      int fieldOffset = offset + 8;
+
+      // If the value fits in 4 bytes, it is inlined, else we
+      // need to jump ahead again.
+      if (count * typeLength > 4) {
+        // offset is not the value; it's a pointer to the value
+        // if relative we set things up so s2n will seek to the right
+        // place when it adds this.offset.  Note that this 'relative'
+        // is for the Nikon type 3 makernote.  Other cameras may use
+        // other relative offsets, which would have to be computed here
+        // slightly differently.
+        if (relative) {
+          fieldOffset = file.readInt(fieldOffset, 4) + ifd - 8;
+          if (fakeExif) {
+            fieldOffset += 18;
+          }
+        } else {
+          fieldOffset = file.readInt(fieldOffset, 4);
+        }
+      }
+
+      return IfdEntry(
+          fieldOffset: fieldOffset,
+          tag: tag,
+          fieldType: fieldType,
+          count: count);
+    });
+  }
+
+  Endian get endian => file.endian;
+
+  set endian(Endian e) {
+    file.endian = e;
+  }
+
+  int get baseOffset => file.baseOffset;
+
+  set baseOffset(int v) {
+    file.baseOffset = v;
+  }
+
+  int readInt(int offset, int length, {bool signed = false}) {
+    return file.readInt(offset, length, signed: signed);
+  }
+
+  List<int> readSlice(int relativePos, int length) {
+    return file.readSlice(relativePos, length);
+  }
+
+  IfdRatios _readIfdRatios(IfdEntry entry) {
+    final List<Ratio> values = [];
+    var pos = entry.fieldOffset;
+    for (int dummy = 0; dummy < entry.count; dummy++) {
+      values.add(file.readRatio(pos, signed: entry.fieldType.isSigned));
+      pos += entry.fieldType.length;
+    }
+    return IfdRatios(values);
+  }
+
+  IfdInts _readIfdInts(IfdEntry entry) {
+    final List<int> values = [];
+    var pos = entry.fieldOffset;
+    for (int dummy = 0; dummy < entry.count; dummy++) {
+      values.add(file.readInt(pos, entry.fieldType.length,
+          signed: entry.fieldType.isSigned));
+      pos += entry.fieldType.length;
+    }
+    return IfdInts(values);
+  }
+
+  IfdBytes _readAscii(IfdEntry entry) {
+    var count = entry.count;
+    // special case: null-terminated ASCII string
+    // XXX investigate
+    // sometimes gets too big to fit in int value
+    if (count <= 0) {
+      return IfdBytes.empty();
+    }
+
+    if (count > 1024 * 1024) {
+      count = 1024 * 1024;
+    }
+
+    try {
+      // and count < (2**31))  // 2E31 is hardware dependant. --gd
+      var values = file.readSlice(entry.fieldOffset, count);
+      // Drop any garbage after a null.
+      final i = values.indexOf(0);
+      if (i >= 0) {
+        values = values.sublist(0, i);
+      }
+      return IfdBytes(Uint8List.fromList(values));
+    } catch (e) {
+      // warnings.add("exception($e) at position: $filePosition, length: $count");
+      return IfdBytes.empty();
+    }
+  }
+
+  IfdValues readField(IfdEntry entry, {required String tagName}) {
+    if (entry.fieldType == FieldType.ascii) {
+      return _readAscii(entry);
+    }
+
+    // XXX investigate
+    // some entries get too big to handle could be malformed
+    // file or problem with this.s2n
+    if (entry.count < 1000) {
+      if (entry.fieldType == FieldType.ratio ||
+          entry.fieldType == FieldType.signedRatio) {
+        return _readIfdRatios(entry);
+      } else {
+        return _readIfdInts(entry);
+      }
+      // The test above causes problems with tags that are
+      // supposed to have long values! Fix up one important case.
+    } else if (tagName == 'MakerNote' ||
+        tagName == MakerNoteCanon.cameraInfoTagName) {
+      return _readIfdInts(entry);
+    }
+    return const IfdNone();
+  }
+
+  List<int> offsetToBytes(int readOffset, int length) {
+    return file.offsetToBytes(readOffset, length);
+  }
+}
+
+class IfdEntry {
+  final int fieldOffset;
+  final int tag;
+  final FieldType fieldType;
+  final int count;
+
+  IfdEntry({
+    required this.fieldOffset,
+    required this.tag,
+    required this.fieldType,
+    required this.count,
+  });
+}
diff --git a/exif/lib/src/tags.dart b/exif/lib/src/tags.dart
new file mode 100644
index 0000000..ad6f2d0
--- /dev/null
+++ b/exif/lib/src/tags.dart
@@ -0,0 +1,413 @@
+import 'package:exif/src/tags_info.dart'
+    show MakerTag, MakerTagFunc, TagsBase, MakerTagsWithName;
+import 'package:exif/src/util.dart';
+
+// Standard tag definitions.
+
+class StandardTags extends TagsBase {
+  static MakerTag _make(String name) => MakerTag.make(name);
+
+  static MakerTag _withMap(String name, Map<int, String> map) =>
+      MakerTag.makeWithMap(name, map);
+
+  static MakerTag _withFunc(String name, MakerTagFunc func) =>
+      MakerTag.makeWithFunc(name, func);
+
+  static MakerTag _withTags(String name, MakerTagsWithName tags) =>
+      MakerTag.makeWithTags(name, tags);
+
+  // Interoperability tags
+  static final Map<int, MakerTag> _interopTags = {
+    0x0001: _make('InteroperabilityIndex'),
+    0x0002: _make('InteroperabilityVersion'),
+    0x1000: _make('RelatedImageFileFormat'),
+    0x1001: _make('RelatedImageWidth'),
+    0x1002: _make('RelatedImageLength'),
+  };
+
+  static final MakerTagsWithName _interopInfo =
+      MakerTagsWithName(name: 'Interoperability', tags: _interopTags);
+
+  // GPS tags
+  static final Map<int, MakerTag> _gpsTags = {
+    0x0000: _make('GPSVersionID'),
+    0x0001: _make('GPSLatitudeRef'),
+    0x0002: _make('GPSLatitude'),
+    0x0003: _make('GPSLongitudeRef'),
+    0x0004: _make('GPSLongitude'),
+    0x0005: _make('GPSAltitudeRef'),
+    0x0006: _make('GPSAltitude'),
+    0x0007: _make('GPSTimeStamp'),
+    0x0008: _make('GPSSatellites'),
+    0x0009: _make('GPSStatus'),
+    0x000A: _make('GPSMeasureMode'),
+    0x000B: _make('GPSDOP'),
+    0x000C: _make('GPSSpeedRef'),
+    0x000D: _make('GPSSpeed'),
+    0x000E: _make('GPSTrackRef'),
+    0x000F: _make('GPSTrack'),
+    0x0010: _make('GPSImgDirectionRef'),
+    0x0011: _make('GPSImgDirection'),
+    0x0012: _make('GPSMapDatum'),
+    0x0013: _make('GPSDestLatitudeRef'),
+    0x0014: _make('GPSDestLatitude'),
+    0x0015: _make('GPSDestLongitudeRef'),
+    0x0016: _make('GPSDestLongitude'),
+    0x0017: _make('GPSDestBearingRef'),
+    0x0018: _make('GPSDestBearing'),
+    0x0019: _make('GPSDestDistanceRef'),
+    0x001A: _make('GPSDestDistance'),
+    0x001B: _make('GPSProcessingMethod'),
+    0x001C: _make('GPSAreaInformation'),
+    0x001D: _make('GPSDate'),
+    0x001E: _make('GPSDifferential'),
+  };
+
+  static final MakerTagsWithName _gpsInfo =
+      MakerTagsWithName(name: 'GPS', tags: _gpsTags);
+
+  // Main Exif tag names
+  static final Map<int, MakerTag> tags = {
+    0x00FE: _withMap('SubfileType', {
+      0x0: 'Full-resolution Image',
+      0x1: 'Reduced-resolution image',
+      0x2: 'Single page of multi-page image',
+      0x3: 'Single page of multi-page reduced-resolution image',
+      0x4: 'Transparency mask',
+      0x5: 'Transparency mask of reduced-resolution image',
+      0x6: 'Transparency mask of multi-page image',
+      0x7: 'Transparency mask of reduced-resolution multi-page image',
+      0x10001: 'Alternate reduced-resolution image',
+      0xffffffff: 'invalid ',
+    }),
+    0x00FF: _withMap('OldSubfileType', {
+      1: 'Full-resolution image',
+      2: 'Reduced-resolution image',
+      3: 'Single page of multi-page image',
+    }),
+    0x0100: _make('ImageWidth'),
+    0x0101: _make('ImageLength'),
+    0x0102: _make('BitsPerSample'),
+    0x0103: _withMap('Compression', const {
+      1: 'Uncompressed',
+      2: 'CCITT 1D',
+      3: 'T4/Group 3 Fax',
+      4: 'T6/Group 4 Fax',
+      5: 'LZW',
+      6: 'JPEG (old-style)',
+      7: 'JPEG',
+      8: 'Adobe Deflate',
+      9: 'JBIG B&W',
+      10: 'JBIG Color',
+      32766: 'Next',
+      32769: 'Epson ERF Compressed',
+      32771: 'CCIRLEW',
+      32773: 'PackBits',
+      32809: 'Thunderscan',
+      32895: 'IT8CTPAD',
+      32896: 'IT8LW',
+      32897: 'IT8MP',
+      32898: 'IT8BL',
+      32908: 'PixarFilm',
+      32909: 'PixarLog',
+      32946: 'Deflate',
+      32947: 'DCS',
+      34661: 'JBIG',
+      34676: 'SGILog',
+      34677: 'SGILog24',
+      34712: 'JPEG 2000',
+      34713: 'Nikon NEF Compressed',
+      65000: 'Kodak DCR Compressed',
+      65535: 'Pentax PEF Compressed'
+    }),
+    0x0106: _make('PhotometricInterpretation'),
+    0x0107: _make('Thresholding'),
+    0x0108: _make('CellWidth'),
+    0x0109: _make('CellLength'),
+    0x010A: _make('FillOrder'),
+    0x010D: _make('DocumentName'),
+    0x010E: _make('ImageDescription'),
+    0x010F: _make('Make'),
+    0x0110: _make('Model'),
+    0x0111: _make('StripOffsets'),
+    0x0112: _withMap('Orientation', const {
+      1: 'Horizontal (normal)',
+      2: 'Mirrored horizontal',
+      3: 'Rotated 180',
+      4: 'Mirrored vertical',
+      5: 'Mirrored horizontal then rotated 90 CCW',
+      6: 'Rotated 90 CW',
+      7: 'Mirrored horizontal then rotated 90 CW',
+      8: 'Rotated 90 CCW'
+    }),
+    0x0115: _make('SamplesPerPixel'),
+    0x0116: _make('RowsPerStrip'),
+    0x0117: _make('StripByteCounts'),
+    0x0118: _make('MinSampleValue'),
+    0x0119: _make('MaxSampleValue'),
+    0x011A: _make('XResolution'),
+    0x011B: _make('YResolution'),
+    0x011C: _make('PlanarConfiguration'),
+    0x011D: _withFunc('PageName', makeString),
+    0x011E: _make('XPosition'),
+    0x011F: _make('YPosition'),
+    0x0122: _withMap('GrayResponseUnit', const {
+      1: '0.1',
+      2: '0.001',
+      3: '0.0001',
+      4: '1e-05',
+      5: '1e-06',
+    }),
+    0x0123: _make('GrayResponseCurve'),
+    0x0124: _make('T4Options'),
+    0x0125: _make('T6Options'),
+    0x0128: _withMap('ResolutionUnit',
+        const {1: 'Not Absolute', 2: 'Pixels/Inch', 3: 'Pixels/Centimeter'}),
+    0x0129: _make('PageNumber'),
+    0x012C: _make('ColorResponseUnit'),
+    0x012D: _make('TransferFunction'),
+    0x0131: _make('Software'),
+    0x0132: _make('DateTime'),
+    0x013B: _make('Artist'),
+    0x013C: _make('HostComputer'),
+    0x013D:
+        _withMap('Predictor', const {1: 'None', 2: 'Horizontal differencing'}),
+    0x013E: _make('WhitePoint'),
+    0x013F: _make('PrimaryChromaticities'),
+    0x0140: _make('ColorMap'),
+    0x0141: _make('HalftoneHints'),
+    0x0142: _make('TileWidth'),
+    0x0143: _make('TileLength'),
+    0x0144: _make('TileOffsets'),
+    0x0145: _make('TileByteCounts'),
+    0x0146: _make('BadFaxLines'),
+    0x0147: _withMap(
+        'CleanFaxData', const {0: 'Clean', 1: 'Regenerated', 2: 'Unclean'}),
+    0x0148: _make('ConsecutiveBadFaxLines'),
+    0x014C: _withMap('InkSet', const {1: 'CMYK', 2: 'Not CMYK'}),
+    0x014D: _make('InkNames'),
+    0x014E: _make('NumberofInks'),
+    0x0150: _make('DotRange'),
+    0x0151: _make('TargetPrinter'),
+    0x0152: _withMap('ExtraSamples', const {
+      0: 'Unspecified',
+      1: 'Associated Alpha',
+      2: 'Unassociated Alpha'
+    }),
+    0x0153: _withMap('SampleFormat', const {
+      1: 'Unsigned',
+      2: 'Signed',
+      3: 'Float',
+      4: 'Undefined',
+      5: 'Complex int',
+      6: 'Complex float'
+    }),
+    0x0154: _make('SMinSampleValue'),
+    0x0155: _make('SMaxSampleValue'),
+    0x0156: _make('TransferRange'),
+    0x0157: _make('ClipPath'),
+    0x0200: _make('JPEGProc'),
+    0x0201: _make('JPEGInterchangeFormat'),
+    0x0202: _make('JPEGInterchangeFormatLength'),
+    0x0211: _make('YCbCrCoefficients'),
+    0x0212: _make('YCbCrSubSampling'),
+    0x0213: _withMap('YCbCrPositioning', const {1: 'Centered', 2: 'Co-sited'}),
+    0x0214: _make('ReferenceBlackWhite'),
+    0x02BC: _make('ApplicationNotes'), // XPM Info
+    0x4746: _make('Rating'),
+    0x828D: _make('CFARepeatPatternDim'),
+    0x828E: _make('CFAPattern'),
+    0x828F: _make('BatteryLevel'),
+    0x8298: _make('Copyright'),
+    0x829A: _make('ExposureTime'),
+    0x829D: _make('FNumber'),
+    0x83BB: _make('IPTC/NAA'),
+    0x8769: _make('ExifOffset'), // Exif Tags
+    0x8773: _make('InterColorProfile'),
+    0x8822: _withMap('ExposureProgram', const {
+      0: 'Unidentified',
+      1: 'Manual',
+      2: 'Program Normal',
+      3: 'Aperture Priority',
+      4: 'Shutter Priority',
+      5: 'Program Creative',
+      6: 'Program Action',
+      7: 'Portrait Mode',
+      8: 'Landscape Mode'
+    }),
+    0x8824: _make('SpectralSensitivity'),
+    0x8825: _withTags('GPSInfo', _gpsInfo), // GPS tags
+    0x8827: _make('ISOSpeedRatings'),
+    0x8828: _make('OECF'),
+    0x8830: _withMap('SensitivityType', const {
+      0: 'Unknown',
+      1: 'Standard Output Sensitivity',
+      2: 'Recommended Exposure Index',
+      3: 'ISO Speed',
+      4: 'Standard Output Sensitivity and Recommended Exposure Index',
+      5: 'Standard Output Sensitivity and ISO Speed',
+      6: 'Recommended Exposure Index and ISO Speed',
+      7: 'Standard Output Sensitivity, Recommended Exposure Index and ISO Speed'
+    }),
+    0x8832: _make('RecommendedExposureIndex'),
+    0x8833: _make('ISOSpeed'),
+    0x9000: _withFunc('ExifVersion', makeString),
+    0x9003: _make('DateTimeOriginal'),
+    0x9004: _make('DateTimeDigitized'),
+    0x9010: _make('OffsetTime'),
+    0x9011: _make('OffsetTimeOriginal'),
+    0x9012: _make('OffsetTimeDigitized'),
+    0x9101: _withMap('ComponentsConfiguration', const {
+      0: '',
+      1: 'Y',
+      2: 'Cb',
+      3: 'Cr',
+      4: 'Red',
+      5: 'Green',
+      6: 'Blue'
+    }),
+    0x9102: _make('CompressedBitsPerPixel'),
+    0x9201: _make('ShutterSpeedValue'),
+    0x9202: _make('ApertureValue'),
+    0x9203: _make('BrightnessValue'),
+    0x9204: _make('ExposureBiasValue'),
+    0x9205: _make('MaxApertureValue'),
+    0x9206: _make('SubjectDistance'),
+    0x9207: _withMap('MeteringMode', const {
+      0: 'Unidentified',
+      1: 'Average',
+      2: 'CenterWeightedAverage',
+      3: 'Spot',
+      4: 'MultiSpot',
+      5: 'Pattern',
+      6: 'Partial',
+      255: 'other'
+    }),
+    0x9208: _withMap('LightSource', const {
+      0: 'Unknown',
+      1: 'Daylight',
+      2: 'Fluorescent',
+      3: 'Tungsten (incandescent light)',
+      4: 'Flash',
+      9: 'Fine weather',
+      10: 'Cloudy weather',
+      11: 'Shade',
+      12: 'Daylight fluorescent (D 5700 - 7100K)',
+      13: 'Day white fluorescent (N 4600 - 5400K)',
+      14: 'Cool white fluorescent (W 3900 - 4500K)',
+      15: 'White fluorescent (WW 3200 - 3700K)',
+      17: 'Standard light A',
+      18: 'Standard light B',
+      19: 'Standard light C',
+      20: 'D55',
+      21: 'D65',
+      22: 'D75',
+      23: 'D50',
+      24: 'ISO studio tungsten',
+      255: 'other light source'
+    }),
+    0x9209: _withMap('Flash', const {
+      0: 'Flash did not fire',
+      1: 'Flash fired',
+      5: 'Strobe return light not detected',
+      7: 'Strobe return light detected',
+      9: 'Flash fired, compulsory flash mode',
+      13: 'Flash fired, compulsory flash mode, return light not detected',
+      15: 'Flash fired, compulsory flash mode, return light detected',
+      16: 'Flash did not fire, compulsory flash mode',
+      24: 'Flash did not fire, auto mode',
+      25: 'Flash fired, auto mode',
+      29: 'Flash fired, auto mode, return light not detected',
+      31: 'Flash fired, auto mode, return light detected',
+      32: 'No flash function',
+      65: 'Flash fired, red-eye reduction mode',
+      69: 'Flash fired, red-eye reduction mode, return light not detected',
+      71: 'Flash fired, red-eye reduction mode, return light detected',
+      73: 'Flash fired, compulsory flash mode, red-eye reduction mode',
+      77: 'Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected',
+      79: 'Flash fired, compulsory flash mode, red-eye reduction mode, return light detected',
+      89: 'Flash fired, auto mode, red-eye reduction mode',
+      93: 'Flash fired, auto mode, return light not detected, red-eye reduction mode',
+      95: 'Flash fired, auto mode, return light detected, red-eye reduction mode'
+    }),
+    0x920A: _make('FocalLength'),
+    0x9214: _make('SubjectArea'),
+    0x927C: _make('MakerNote'),
+    0x9286: _withFunc('UserComment', makeStringUc),
+    0x9290: _make('SubSecTime'),
+    0x9291: _make('SubSecTimeOriginal'),
+    0x9292: _make('SubSecTimeDigitized'),
+
+    // used by Windows Explorer
+    0x9C9B: _make('XPTitle'),
+    0x9C9C: _make('XPComment'),
+    0x9C9D: _withFunc('XPAuthor',
+        makeString), // const [gnored by Windows Explorer if Artist exists]
+    0x9C9E: _make('XPKeywords'),
+    0x9C9F: _make('XPSubject'),
+    0xA000: _withFunc('FlashPixVersion', makeString),
+    0xA001: _withMap(
+        'ColorSpace', const {1: 'sRGB', 2: 'Adobe RGB', 65535: 'Uncalibrated'}),
+    0xA002: _make('ExifImageWidth'),
+    0xA003: _make('ExifImageLength'),
+    0xA004: _make('RelatedSoundFile'),
+    0xA005: _withTags('InteroperabilityOffset', _interopInfo),
+    0xA20B: _make('FlashEnergy'), // 0x920B in TIFF/EP
+    0xA20C: _make('SpatialFrequencyResponse'), // 0x920C
+    0xA20E: _make('FocalPlaneXResolution'), // 0x920E
+    0xA20F: _make('FocalPlaneYResolution'), // 0x920F
+    0xA210: _make('FocalPlaneResolutionUnit'), // 0x9210
+    0xA214: _make('SubjectLocation'), // 0x9214
+    0xA215: _make('ExposureIndex'), // 0x9215
+    0xA217: _withMap('SensingMethod', const {
+      // 0x9217
+      1: 'Not defined',
+      2: 'One-chip color area',
+      3: 'Two-chip color area',
+      4: 'Three-chip color area',
+      5: 'Color sequential area',
+      7: 'Trilinear',
+      8: 'Color sequential linear'
+    }),
+    0xA300: _withMap('FileSource', const {
+      1: 'Film Scanner',
+      2: 'Reflection Print Scanner',
+      3: 'Digital Camera'
+    }),
+    0xA301: _withMap('SceneType', const {1: 'Directly Photographed'}),
+    0xA302: _make('CVAPattern'),
+    0xA401: _withMap('CustomRendered', const {0: 'Normal', 1: 'Custom'}),
+    0xA402: _withMap('ExposureMode',
+        const {0: 'Auto Exposure', 1: 'Manual Exposure', 2: 'Auto Bracket'}),
+    0xA403: _withMap('WhiteBalance', const {0: 'Auto', 1: 'Manual'}),
+    0xA404: _make('DigitalZoomRatio'),
+    0xA405: _make('FocalLengthIn35mmFilm'),
+    0xA406: _withMap('SceneCaptureType',
+        const {0: 'Standard', 1: 'Landscape', 2: 'Portrait', 3: 'Night]'}),
+    0xA407: _withMap('GainControl', const {
+      0: 'None',
+      1: 'Low gain up',
+      2: 'High gain up',
+      3: 'Low gain down',
+      4: 'High gain down'
+    }),
+    0xA408: _withMap('Contrast', const {0: 'Normal', 1: 'Soft', 2: 'Hard'}),
+    0xA409: _withMap('Saturation', const {0: 'Normal', 1: 'Soft', 2: 'Hard'}),
+    0xA40A: _withMap('Sharpness', const {0: 'Normal', 1: 'Soft', 2: 'Hard'}),
+    0xA40B: _make('DeviceSettingDescription'),
+    0xA40C: _make('SubjectDistanceRange'),
+    0xA420: _make('ImageUniqueID'),
+    0xA430: _make('CameraOwnerName'),
+    0xA431: _make('BodySerialNumber'),
+    0xA432: _make('LensSpecification'),
+    0xA433: _make('LensMake'),
+    0xA434: _make('LensModel'),
+    0xA435: _make('LensSerialNumber'),
+    0xA500: _make('Gamma'),
+    0xC4A5: _make('PrintIM'),
+    0xEA1C: _make('Padding'),
+    0xEA1D: _make('OffsetSchema'),
+    0xFDE8: _make('OwnerName'),
+    0xFDE9: _make('SerialNumber'),
+  };
+}
diff --git a/exif/lib/src/tags_info.dart b/exif/lib/src/tags_info.dart
new file mode 100644
index 0000000..f48115b
--- /dev/null
+++ b/exif/lib/src/tags_info.dart
@@ -0,0 +1,25 @@
+typedef MakerTagFunc = String Function(List<int> list);
+
+class MakerTag {
+  String name;
+  Map<int, String>? map;
+  MakerTagFunc? func;
+  MakerTagsWithName? tags;
+
+  MakerTag.make(this.name);
+
+  MakerTag.makeWithMap(this.name, this.map);
+
+  MakerTag.makeWithFunc(this.name, this.func);
+
+  MakerTag.makeWithTags(this.name, this.tags);
+}
+
+class MakerTagsWithName {
+  String name;
+  Map<int, MakerTag> tags;
+
+  MakerTagsWithName({this.name = "", this.tags = const {}});
+}
+
+class TagsBase {}
diff --git a/exif/lib/src/util.dart b/exif/lib/src/util.dart
new file mode 100644
index 0000000..298f88b
--- /dev/null
+++ b/exif/lib/src/util.dart
@@ -0,0 +1,109 @@
+import 'dart:math';
+
+import 'package:collection/collection.dart' show ListEquality;
+import 'package:sprintf/sprintf.dart' show sprintf;
+
+bool listRangeEqual(List list1, int begin, int end, List list2) {
+  var beginIndex = begin >= 0 ? begin : 0;
+  beginIndex = beginIndex < list1.length ? beginIndex : list1.length;
+
+  var endIndex = end >= begin ? end : begin;
+  endIndex = endIndex < list1.length ? endIndex : list1.length;
+
+  return listEqual(list1.sublist(beginIndex, endIndex), list2);
+}
+
+final listEqual = const ListEquality().equals;
+
+bool listHasPrefix(List list, List prefix, {int start = 0}) {
+  if (prefix.isEmpty) {
+    return true;
+  }
+  if (list.length - start < prefix.length) {
+    return false;
+  }
+  return listEqual(list.sublist(start, start + prefix.length), prefix);
+}
+
+bool listContainedIn<T>(List<T> a, List<List<T>> b) =>
+    b.any((i) => listEqual(i, a));
+
+void printf(String a, List b) => print(sprintf(a, b));
+
+// Don't throw an exception when given an out of range character.
+String makeString(List<int> seq) {
+  String s = String.fromCharCodes(seq.where((c) => 32 <= c && c < 256));
+  if (s.isEmpty) {
+    if (seq.isEmpty || seq.reduce(max) == 0) {
+      return "";
+    }
+    s = seq.map((e) => e.toString()).join();
+  }
+  return s.trim();
+}
+
+// Special version to deal with the code in the first 8 bytes of a user comment.
+// First 8 bytes gives coding system e.g. ASCII vs. JIS vs Unicode.
+String makeStringUc(List<int> seq) {
+  if (seq.length <= 8) {
+    return "";
+  }
+
+  // Remove code from sequence only if it is valid
+  if ({'ASCII', 'UNICODE', 'JIS', ''}
+      .contains(makeString(seq.sublist(0, 8)).toUpperCase())) {
+    seq = seq.sublist(8);
+  }
+
+  // Of course, this is only correct if ASCII, and the standard explicitly
+  // allows JIS and Unicode.
+  return makeString(seq);
+}
+
+// Extract multi-byte integer in little endian.
+int s2nBigEndian(List<int> s, {bool signed = false}) {
+  if (s.isEmpty) {
+    return 0;
+  }
+
+  int xor = 0;
+  if (signed && s[0] >= 128) {
+    xor = 0xff;
+  }
+
+  int x = 0;
+  for (final c in s) {
+    x = (x << 8) | (c ^ xor);
+  }
+
+  if (xor != 0) {
+    x = -(x + 1);
+  }
+
+  return x;
+}
+
+// Extract multi-byte integer in little endian.
+int s2nLittleEndian(List<int> s, {bool signed = false}) {
+  if (s.isEmpty) {
+    return 0;
+  }
+
+  int xor = 0;
+  if (signed && s.last >= 128) {
+    xor = 0xff;
+  }
+
+  int x = 0;
+  int y = 0;
+  for (final int c in s) {
+    x = x | ((c ^ xor) << y);
+    y += 8;
+  }
+
+  if (xor != 0) {
+    x = -(x + 1);
+  }
+
+  return x;
+}
diff --git a/exif/lib/src/values_to_printable.dart b/exif/lib/src/values_to_printable.dart
new file mode 100644
index 0000000..8489b92
--- /dev/null
+++ b/exif/lib/src/values_to_printable.dart
@@ -0,0 +1,84 @@
+import 'dart:convert';
+
+import 'package:exif/src/exif_types.dart';
+import 'package:exif/src/field_types.dart';
+import 'package:exif/src/reader.dart';
+import 'package:exif/src/tags_info.dart';
+
+class ValuesToPrintable {
+  final String value;
+  final bool malformed;
+
+  const ValuesToPrintable(this.value) : malformed = false;
+
+  const ValuesToPrintable.malformed(this.value) : malformed = true;
+
+  factory ValuesToPrintable.convert(IfdValues values, IfdEntry entry,
+      {required MakerTag? tagEntry, required bool truncateTags}) {
+    // compute printable version of values
+    if (tagEntry != null) {
+      // optional 2nd tag element is present
+      if (tagEntry.func != null) {
+        // call mapping function
+        final printable =
+            tagEntry.func!(values.toList().whereType<int>().toList());
+        return ValuesToPrintable(printable);
+      } else if (tagEntry.map != null) {
+        final sb = StringBuffer();
+        for (final i in values.toList()) {
+          // use lookup table for this tag
+          if (i is int) {
+            sb.write(tagEntry.map![i] ?? i);
+          } else {
+            sb.write(i);
+          }
+        }
+        return ValuesToPrintable(sb.toString());
+      }
+    }
+
+    if (entry.fieldType == FieldType.ascii && values is IfdBytes) {
+      final bytes = values.bytes;
+      try {
+        return ValuesToPrintable(utf8.decode(bytes));
+      } on FormatException {
+        if (truncateTags && bytes.length > 20) {
+          return ValuesToPrintable.malformed(
+              'b"${bytesToStringRepr(bytes.sublist(0, 20))}, ... ]');
+        }
+        return ValuesToPrintable.malformed("b'${bytesToStringRepr(bytes)}'");
+      }
+    } else if (entry.count == 1) {
+      return ValuesToPrintable(values.toList()[0].toString());
+    }
+
+    if (entry.count > 50 && values.length > 20) {
+      if (truncateTags) {
+        final s = values.toList().sublist(0, 20).toString();
+        return ValuesToPrintable("${s.substring(0, s.length - 1)}, ... ]");
+      }
+    }
+
+    return ValuesToPrintable(values.toString());
+  }
+
+  static String bytesToStringRepr(List<int> bytes) => bytes.map((e) {
+        switch (e) {
+          case 9:
+            return r'\t';
+          case 10:
+            return r'\n';
+          case 13:
+            return r'\r';
+          case 92:
+            return r'\\';
+        }
+
+        if (e < 32 || e >= 128) {
+          final hex = e.toRadixString(16).padLeft(2, '0');
+          return "\\x$hex";
+        }
+
+        return String.fromCharCode(e);
+      }).join();
+}
diff --git a/exif/pubspec.yaml b/exif/pubspec.yaml
new file mode 100644
index 0000000..5a0dcb5
--- /dev/null
+++ b/exif/pubspec.yaml
@@ -0,0 +1,25 @@
+name: exif
+version: 3.3.0
+description: >-
+  Decode Exif metadata from digital image files.
+  Supported formats: TIFF, JPEG, HEIC, PNG, WebP
+homepage: https://www.github.com/bigflood/dartexif
+environment:
+  sdk: '>=2.12.0 <4.0.0'
+dependencies:
+  args: ^2.0.0
+  collection: ^1.15.0
+  convert: ^3.0.0
+  json_annotation: ^4.3.0
+  sprintf: ^7.0.0
+dev_dependencies:
+  archive: ^3.1.2
+  build_runner: ^2.1.4
+  http: '>=1.0.0 <2.0.0'
+  json_serializable: ^6.0.0
+  lints: ^2.0.1
+  path: ^1.8.0
+  stream_channel: ^2.1.0
+  test: ^1.16.8
+executables:
+  print_exif:
diff --git a/exif/test/data/avif-test.avif b/exif/test/data/avif-test.avif
new file mode 100644
index 0000000..8a13b7f
Binary files /dev/null and b/exif/test/data/avif-test.avif differ
diff --git a/exif/test/data/avif-test.avif.dump b/exif/test/data/avif-test.avif.dump
new file mode 100644
index 0000000..addaee0
--- /dev/null
+++ b/exif/test/data/avif-test.avif.dump
@@ -0,0 +1,59 @@
+EXIF ApertureValue (Ratio): 4845/1918
+EXIF BrightnessValue (Signed Ratio): 7187/850
+EXIF ColorSpace (Short): Uncalibrated
+EXIF ComponentsConfiguration (Undefined): YCbCr
+EXIF CustomRendered (Short): 2
+EXIF DateTimeDigitized (ASCII): 2018:03:30 12:14:19
+EXIF DateTimeOriginal (ASCII): 2018:03:30 12:14:19
+EXIF ExifImageLength (Long): 180
+EXIF ExifImageWidth (Long): 240
+EXIF ExifVersion (Undefined): 0221
+EXIF ExposureBiasValue (Signed Ratio): 0
+EXIF ExposureMode (Short): Auto Exposure
+EXIF ExposureProgram (Short): Program Normal
+EXIF ExposureTime (Ratio): 1/209
+EXIF FNumber (Ratio): 12/5
+EXIF Flash (Short): Flash did not fire, compulsory flash mode
+EXIF FlashPixVersion (Undefined): 0100
+EXIF FocalLength (Ratio): 6
+EXIF FocalLengthIn35mmFilm (Short): 52
+EXIF ISOSpeedRatings (Short): 16
+EXIF LensMake (ASCII): Apple
+EXIF LensModel (ASCII): iPhone X back dual camera 6mm f/2.4
+EXIF LensSpecification (Ratio): [4, 6, 9/5, 12/5]
+EXIF MakerNote (Undefined): []
+EXIF MeteringMode (Short): Pattern
+EXIF SceneCaptureType (Short): Standard
+EXIF SceneType (Undefined): Directly Photographed
+EXIF SensingMethod (Short): One-chip color area
+EXIF ShutterSpeedValue (Signed Ratio): 7789/1011
+EXIF SubSecTimeDigitized (ASCII): 365
+EXIF SubSecTimeOriginal (ASCII): 365
+EXIF SubjectArea (Short): [2007, 1503, 2209, 1327]
+EXIF WhiteBalance (Short): Auto
+GPS GPSAltitude (Ratio): 6568/1433
+GPS GPSAltitudeRef (Byte): 0
+GPS GPSDate (ASCII): 2018:03:30
+GPS GPSDestBearing (Ratio): 21278/339
+GPS GPSDestBearingRef (ASCII): M
+GPS GPSImgDirection (Ratio): 21278/339
+GPS GPSImgDirectionRef (ASCII): M
+GPS GPSLatitude (Ratio): [37, 45, 907/25]
+GPS GPSLatitudeRef (ASCII): N
+GPS GPSLongitude (Ratio): [122, 30, 861/25]
+GPS GPSLongitudeRef (ASCII): W
+GPS GPSSpeed (Ratio): 5709/10354
+GPS GPSSpeedRef (ASCII): K
+GPS GPSTimeStamp (Ratio): [19, 14, 1813/100]
+GPS Tag 0x001F (Ratio): 6619/1103
+Image DateTime (ASCII): 2018:03:30 12:14:19
+Image ExifOffset (Long): 204
+Image GPSInfo (Long): 784
+Image Make (ASCII): Apple
+Image Model (ASCII): iPhone X
+Image Orientation (Short): Horizontal (normal)
+Image ResolutionUnit (Short): Pixels/Inch
+Image Software (ASCII): 12.0
+Image XResolution (Ratio): 127/5
+Image YCbCrPositioning (Short): Centered
+Image YResolution (Ratio): 127/5
diff --git a/exif/test/data/heic-test.heic b/exif/test/data/heic-test.heic
new file mode 100644
index 0000000..e1319d3
Binary files /dev/null and b/exif/test/data/heic-test.heic differ
diff --git a/exif/test/data/heic-test.heic.dump b/exif/test/data/heic-test.heic.dump
new file mode 100644
index 0000000..9752086
--- /dev/null
+++ b/exif/test/data/heic-test.heic.dump
@@ -0,0 +1,80 @@
+EXIF ApertureValue (Ratio): 4845/1918
+EXIF BrightnessValue (Signed Ratio): 7187/850
+EXIF ColorSpace (Short): Uncalibrated
+EXIF ComponentsConfiguration (Undefined): YCbCr
+EXIF CustomRendered (Short): 2
+EXIF DateTimeDigitized (ASCII): 2018:03:30 12:14:19
+EXIF DateTimeOriginal (ASCII): 2018:03:30 12:14:19
+EXIF ExifImageLength (Long): 3024
+EXIF ExifImageWidth (Long): 4032
+EXIF ExifVersion (Undefined): 0221
+EXIF ExposureBiasValue (Signed Ratio): 0
+EXIF ExposureMode (Short): Auto Exposure
+EXIF ExposureProgram (Short): Program Normal
+EXIF ExposureTime (Ratio): 1/209
+EXIF FNumber (Ratio): 12/5
+EXIF Flash (Short): Flash did not fire, compulsory flash mode
+EXIF FlashPixVersion (Undefined): 0100
+EXIF FocalLength (Ratio): 6
+EXIF FocalLengthIn35mmFilm (Short): 52
+EXIF ISOSpeedRatings (Short): 16
+EXIF LensMake (ASCII): Apple
+EXIF LensModel (ASCII): iPhone X back dual camera 6mm f/2.4
+EXIF LensSpecification (Ratio): [4, 6, 9/5, 12/5]
+EXIF MakerNote (Undefined): [65, 112, 112, 108, 101, 32, 105, 79, 83, 0, 0, 1, 77, 77, 0, 21, 0, 1, 0, 9, ... ]
+EXIF MeteringMode (Short): Pattern
+EXIF SceneCaptureType (Short): Standard
+EXIF SceneType (Undefined): Directly Photographed
+EXIF SensingMethod (Short): One-chip color area
+EXIF ShutterSpeedValue (Signed Ratio): 7789/1011
+EXIF SubSecTimeDigitized (ASCII): 365
+EXIF SubSecTimeOriginal (ASCII): 365
+EXIF SubjectArea (Short): [2007, 1503, 2209, 1327]
+EXIF WhiteBalance (Short): Auto
+GPS GPSAltitude (Ratio): 6568/1433
+GPS GPSAltitudeRef (Byte): 0
+GPS GPSDate (ASCII): 2018:03:30
+GPS GPSDestBearing (Ratio): 21278/339
+GPS GPSDestBearingRef (ASCII): M
+GPS GPSImgDirection (Ratio): 21278/339
+GPS GPSImgDirectionRef (ASCII): M
+GPS GPSLatitude (Ratio): [37, 45, 907/25]
+GPS GPSLatitudeRef (ASCII): N
+GPS GPSLongitude (Ratio): [122, 30, 861/25]
+GPS GPSLongitudeRef (ASCII): W
+GPS GPSSpeed (Ratio): 5709/10354
+GPS GPSSpeedRef (ASCII): K
+GPS GPSTimeStamp (Ratio): [19, 14, 1813/100]
+GPS Tag 0x001F (Ratio): 6619/1103
+Image DateTime (ASCII): 2018:03:30 12:14:19
+Image ExifOffset (Long): 204
+Image GPSInfo (Long): 1818
+Image Make (ASCII): Apple
+Image Model (ASCII): iPhone X
+Image Orientation (Short): Rotated 180
+Image ResolutionUnit (Short): Pixels/Inch
+Image Software (ASCII): 12.0
+Image XResolution (Ratio): 72
+Image YCbCrPositioning (Short): Centered
+Image YResolution (Ratio): 72
+MakerNote HDRImageType (Signed Long): 2
+MakerNote Tag 0x0001 (Signed Long): 10
+MakerNote Tag 0x0002 (Undefined): [2, 1, 122, 0, 107, 0, 120, 0, 67, 0, 69, 0, 59, 0, 57, 0, 28, 1, 85, 2, ... ]
+MakerNote Tag 0x0003 (Undefined): [6, 7, 8, 85, 102, 108, 97, 103, 115, 85, 118, 97, 108, 117, 101, 89, 116, 105, 109, 101, ... ]
+MakerNote Tag 0x0004 (Signed Long): 1
+MakerNote Tag 0x0005 (Signed Long): 173
+MakerNote Tag 0x0006 (Signed Long): 170
+MakerNote Tag 0x0007 (Signed Long): 1
+MakerNote Tag 0x0008 (Signed Ratio): [-69926911/22675456, 22145/723, 256/7305]
+MakerNote Tag 0x000C (Signed Ratio): [2100775/105295456, 1/200]
+MakerNote Tag 0x000D (Signed Long): 25
+MakerNote Tag 0x000E (Signed Long): 4
+MakerNote Tag 0x0010 (Signed Long): 1
+MakerNote Tag 0x0014 (Signed Long): 3
+MakerNote Tag 0x0017 (Signed Long): 2048
+MakerNote Tag 0x0019 (Signed Long): 34
+MakerNote Tag 0x001A (ASCII): C55AB7
+MakerNote Tag 0x001D (Signed Ratio): 218813911/175351561
+MakerNote Tag 0x001F (Signed Long): 1
+MakerNote Tag 0x0020 (ASCII): 48FC-9F8C-9CCF675F4C62
+MakerNote Tag 0x0021 (Signed Ratio): 1/6
diff --git a/exif/test/data/png-test.png b/exif/test/data/png-test.png
new file mode 100644
index 0000000..595413a
Binary files /dev/null and b/exif/test/data/png-test.png differ
diff --git a/exif/test/data/png-test.png.dump b/exif/test/data/png-test.png.dump
new file mode 100644
index 0000000..ad4628c
--- /dev/null
+++ b/exif/test/data/png-test.png.dump
@@ -0,0 +1,13 @@
+EXIF ComponentsConfiguration (Undefined): YCbCr
+EXIF ExifVersion (Undefined): 0232
+EXIF FlashPixVersion (Undefined): 0100
+EXIF UserComment (Undefined): exif test
+GPS GPSLatitude (Ratio): [44, 29, 76078/1397]
+GPS GPSLatitudeRef (ASCII): N
+GPS GPSLongitude (Ratio): [11, 19, 48947/1171]
+GPS GPSLongitudeRef (ASCII): E
+Image ExifOffset (Long): 88
+Image GPSInfo (Long): 160
+Image ImageDescription (ASCII): Flutter Dash
+Image ResolutionUnit (Short): Pixels/Inch
+Image YCbCrPositioning (Short): Centered
diff --git a/exif/test/data/test-data b/exif/test/data/test-data
new file mode 100644
index 0000000..e69de29
diff --git a/exif/test/data/webp-test.webp b/exif/test/data/webp-test.webp
new file mode 100644
index 0000000..bea9102
Binary files /dev/null and b/exif/test/data/webp-test.webp differ
diff --git a/exif/test/data/webp-test.webp.dump b/exif/test/data/webp-test.webp.dump
new file mode 100644
index 0000000..addaee0
--- /dev/null
+++ b/exif/test/data/webp-test.webp.dump
@@ -0,0 +1,59 @@
+EXIF ApertureValue (Ratio): 4845/1918
+EXIF BrightnessValue (Signed Ratio): 7187/850
+EXIF ColorSpace (Short): Uncalibrated
+EXIF ComponentsConfiguration (Undefined): YCbCr
+EXIF CustomRendered (Short): 2
+EXIF DateTimeDigitized (ASCII): 2018:03:30 12:14:19
+EXIF DateTimeOriginal (ASCII): 2018:03:30 12:14:19
+EXIF ExifImageLength (Long): 180
+EXIF ExifImageWidth (Long): 240
+EXIF ExifVersion (Undefined): 0221
+EXIF ExposureBiasValue (Signed Ratio): 0
+EXIF ExposureMode (Short): Auto Exposure
+EXIF ExposureProgram (Short): Program Normal
+EXIF ExposureTime (Ratio): 1/209
+EXIF FNumber (Ratio): 12/5
+EXIF Flash (Short): Flash did not fire, compulsory flash mode
+EXIF FlashPixVersion (Undefined): 0100
+EXIF FocalLength (Ratio): 6
+EXIF FocalLengthIn35mmFilm (Short): 52
+EXIF ISOSpeedRatings (Short): 16
+EXIF LensMake (ASCII): Apple
+EXIF LensModel (ASCII): iPhone X back dual camera 6mm f/2.4
+EXIF LensSpecification (Ratio): [4, 6, 9/5, 12/5]
+EXIF MakerNote (Undefined): []
+EXIF MeteringMode (Short): Pattern
+EXIF SceneCaptureType (Short): Standard
+EXIF SceneType (Undefined): Directly Photographed
+EXIF SensingMethod (Short): One-chip color area
+EXIF ShutterSpeedValue (Signed Ratio): 7789/1011
+EXIF SubSecTimeDigitized (ASCII): 365
+EXIF SubSecTimeOriginal (ASCII): 365
+EXIF SubjectArea (Short): [2007, 1503, 2209, 1327]
+EXIF WhiteBalance (Short): Auto
+GPS GPSAltitude (Ratio): 6568/1433
+GPS GPSAltitudeRef (Byte): 0
+GPS GPSDate (ASCII): 2018:03:30
+GPS GPSDestBearing (Ratio): 21278/339
+GPS GPSDestBearingRef (ASCII): M
+GPS GPSImgDirection (Ratio): 21278/339
+GPS GPSImgDirectionRef (ASCII): M
+GPS GPSLatitude (Ratio): [37, 45, 907/25]
+GPS GPSLatitudeRef (ASCII): N
+GPS GPSLongitude (Ratio): [122, 30, 861/25]
+GPS GPSLongitudeRef (ASCII): W
+GPS GPSSpeed (Ratio): 5709/10354
+GPS GPSSpeedRef (ASCII): K
+GPS GPSTimeStamp (Ratio): [19, 14, 1813/100]
+GPS Tag 0x001F (Ratio): 6619/1103
+Image DateTime (ASCII): 2018:03:30 12:14:19
+Image ExifOffset (Long): 204
+Image GPSInfo (Long): 784
+Image Make (ASCII): Apple
+Image Model (ASCII): iPhone X
+Image Orientation (Short): Horizontal (normal)
+Image ResolutionUnit (Short): Pixels/Inch
+Image Software (ASCII): 12.0
+Image XResolution (Ratio): 127/5
+Image YCbCrPositioning (Short): Centered
+Image YResolution (Ratio): 127/5
diff --git a/exif/test/read_file_test.dart b/exif/test/read_file_test.dart
new file mode 100644
index 0000000..83591fe
--- /dev/null
+++ b/exif/test/read_file_test.dart
@@ -0,0 +1,52 @@
+@TestOn("vm")
+import "dart:io" as io;
+
+import 'package:exif/exif.dart';
+import "package:test/test.dart";
+
+void main() {
+  test("read heic file test", () async {
+    const filename = "test/data/heic-test.heic";
+    final file = io.File(filename);
+    final output = tagsToString(await readExifFromFile(file));
+    final expected = await io.File("$filename.dump").readAsString();
+    expect(output, equals(expected.trim()));
+  });
+
+  test("read png file test", () async {
+    const filename = "test/data/png-test.png";
+    final file = io.File(filename);
+    final output = tagsToString(await readExifFromFile(file));
+    final expected = await io.File("$filename.dump").readAsString();
+    expect(output, equals(expected.trim()));
+  });
+
+  test("read avif file test", () async {
+    const filename = "test/data/avif-test.avif";
+    final file = io.File(filename);
+    final output = tagsToString(await readExifFromFile(file));
+    final expected = await io.File("$filename.dump").readAsString();
+    expect(output, equals(expected.trim()));
+  });
+
+  test("read webp file test", () async {
+    const filename = "test/data/webp-test.webp";
+    final file = io.File(filename);
+    final output = tagsToString(await readExifFromFile(file));
+    final expected = await io.File("$filename.dump").readAsString();
+    expect(output, equals(expected.trim()));
+  });
+}
+
+String tagsToString(Map<String, IfdTag> tags) {
+  final tagKeys = tags.keys.toList();
+  tagKeys.sort();
+  final prints = [];
+
+  for (final key in tagKeys) {
+    final tag = tags[key];
+    prints.add("$key (${tag!.tagType}): $tag");
+  }
+
+  return prints.join("\n");
+}
diff --git a/exif/test/read_samples.dart b/exif/test/read_samples.dart
new file mode 100644
index 0000000..5cb213c
--- /dev/null
+++ b/exif/test/read_samples.dart
@@ -0,0 +1,94 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io' as io;
+import 'dart:typed_data';
+
+import 'package:archive/archive.dart';
+import 'package:http/http.dart' as http;
+import 'package:path/path.dart' as p;
+
+import 'sample_file.dart';
+
+Stream<SampleFile> readSamples() async* {
+  yield* readIanareSamples();
+
+  yield await readSampleFile("test/data/heic-test.heic");
+}
+
+Future<SampleFile> readSampleFile(String filename) async {
+  final fileBytes = await io.File(filename).readAsBytes();
+  final dump = await io.File("$filename.dump").readAsString();
+
+  return SampleFile(
+    name: filename,
+    content: fileBytes,
+    dump: dump.trim(),
+  );
+}
+
+Stream<SampleFile> readIanareSamples() async* {
+  const commit = "2a62d69683c154ffe03b4502bdfa3248d8a1b05c";
+  final filenamePrefix = p.join("test", "data", "$commit-");
+
+  final dumpFile = await downloadUrl(
+    filenamePrefix,
+    "https://raw.githubusercontent.com/ianare/exif-samples/$commit/dump",
+  );
+
+  final nameToDumps = readDumpFile(dumpFile);
+
+  final path = await downloadUrl(
+    filenamePrefix,
+    "https://github.com/ianare/exif-samples/archive/$commit.tar.gz",
+  );
+
+  final data = io.File(path).readAsBytesSync();
+
+  final ar = TarDecoder().decodeBytes(GZipDecoder().decodeBytes(data));
+
+  for (final file in ar) {
+    file.name =
+        file.name.replaceAll("exif-samples-$commit", "exif-samples-master");
+
+    if (!file.name.endsWith('.jpg') && !file.name.endsWith('.tiff')) {
+      continue;
+    }
+
+    if (!nameToDumps.containsKey(file.name)) {
+      file.name = utf8.decode(file.name.codeUnits);
+    }
+
+    yield SampleFile(
+      name: file.name,
+      content: file.content as Uint8List,
+      dump: nameToDumps[file.name],
+    );
+  }
+}
+
+Map<String, String> readDumpFile(String dumpFile) {
+  final fileDumps = io.File(dumpFile).readAsStringSync().trim().split("\n\n");
+
+  final nameAndDumps = fileDumps.map((e) => e.split("\n")).map((e) => MapEntry(
+      e[0].split("Opening: ")[1],
+      e
+          .sublist(1)
+          .where((e) =>
+              !e.startsWith("Possibly corrupted ") &&
+              !e.startsWith("No values found for "))
+          .join("\n")));
+
+  return Map.fromEntries(nameAndDumps);
+}
+
+Future<String> downloadUrl(String filenamePrefix, String url) async {
+  final filename = filenamePrefix + Uri.parse(url).pathSegments.last;
+
+  if (!await io.File(filename).exists()) {
+    print('downloading $filename ..');
+    final res = await http.get(Uri.parse(url));
+    await io.File(filename).writeAsBytes(res.bodyBytes);
+  }
+
+  return filename;
+}
diff --git a/exif/test/regression_test.dart b/exif/test/regression_test.dart
new file mode 100644
index 0000000..c26b330
--- /dev/null
+++ b/exif/test/regression_test.dart
@@ -0,0 +1,23 @@
+import 'package:exif/exif.dart';
+import "package:test/test.dart";
+
+void main() {
+  test("range error", () async {
+    final data = [
+      '',
+      '\xFF',
+      '\xFF\xD8',
+      '\xFF\xD8abc',
+      'II',
+      'II*\x00',
+      'II*\x00ftypheic',
+      'MM',
+      'MM\x00*',
+    ];
+
+    for (final x in data) {
+      final exifDump = await printExifOfBytes(x.codeUnits);
+      expect(exifDump, equals("No EXIF information found"), reason: x);
+    }
+  });
+}
diff --git a/exif/test/sample_file.dart b/exif/test/sample_file.dart
new file mode 100644
index 0000000..00f884c
--- /dev/null
+++ b/exif/test/sample_file.dart
@@ -0,0 +1,25 @@
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:json_annotation/json_annotation.dart';
+
+part 'sample_file.g.dart';
+
+@JsonSerializable()
+class SampleFile {
+  String name;
+  String encodedContent = "";
+  String? dump;
+
+  List<int> getContent() => base64.decode(encodedContent);
+
+  SampleFile({this.name = "", this.dump = "", Uint8List? content}) {
+    if (content != null) {
+      encodedContent = base64.encode(content);
+    }
+  }
+
+  factory SampleFile.fromJson(Map<String, dynamic> json) =>
+      _$SampleFileFromJson(json);
+  Map<String, dynamic> toJson() => _$SampleFileToJson(this);
+}
diff --git a/exif/test/sample_file.g.dart b/exif/test/sample_file.g.dart
new file mode 100644
index 0000000..e1c7c63
--- /dev/null
+++ b/exif/test/sample_file.g.dart
@@ -0,0 +1,19 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'sample_file.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+SampleFile _$SampleFileFromJson(Map<String, dynamic> json) => SampleFile(
+      name: json['name'] as String? ?? "",
+      dump: json['dump'] as String? ?? "",
+    )..encodedContent = json['encodedContent'] as String;
+
+Map<String, dynamic> _$SampleFileToJson(SampleFile instance) =>
+    <String, dynamic>{
+      'name': instance.name,
+      'encodedContent': instance.encodedContent,
+      'dump': instance.dump,
+    };
diff --git a/exif/test/samples_test.dart b/exif/test/samples_test.dart
new file mode 100644
index 0000000..f923dab
--- /dev/null
+++ b/exif/test/samples_test.dart
@@ -0,0 +1,14 @@
+@TestOn("vm")
+import 'package:exif/exif.dart';
+import 'package:test/test.dart';
+
+import 'read_samples.dart';
+
+Future main() async {
+  await for (final file in readSamples()) {
+    test(file.name, () async {
+      final exifDump = await printExifOfBytes(file.getContent());
+      expect(exifDump, equals(file.dump));
+    });
+  }
+}
diff --git a/exif/test/util_test.dart b/exif/test/util_test.dart
new file mode 100644
index 0000000..acd85f7
--- /dev/null
+++ b/exif/test/util_test.dart
@@ -0,0 +1,11 @@
+import 'package:exif/src/util.dart';
+import "package:test/test.dart";
+
+void main() {
+  test("make_string_uc", () {
+    expect(makeStringUc([]), equals(""));
+    expect(makeStringUc([1, 2, 3, 4, 5, 6, 7]), equals(""));
+    expect(makeStringUc([1, 2, 3, 4, 5, 6, 7, 8, 97, 98, 99]), equals("abc"));
+    expect(makeString([0, 2, 0, 0]), equals("0200"));
+  });
+}
diff --git a/exif/test/web_hybrid_main.dart b/exif/test/web_hybrid_main.dart
new file mode 100644
index 0000000..f715948
--- /dev/null
+++ b/exif/test/web_hybrid_main.dart
@@ -0,0 +1,13 @@
+import 'dart:convert';
+
+import "package:stream_channel/stream_channel.dart";
+
+import 'read_samples.dart';
+
+Future hybridMain(StreamChannel channel) async {
+  await for (final file in readSamples()) {
+    channel.sink.add(const JsonEncoder().convert(file));
+  }
+
+  channel.sink.close();
+}
diff --git a/exif/test/web_test.dart b/exif/test/web_test.dart
new file mode 100644
index 0000000..8fbd91a
--- /dev/null
+++ b/exif/test/web_test.dart
@@ -0,0 +1,21 @@
+@TestOn("browser")
+import "dart:convert";
+
+import 'package:exif/exif.dart';
+import "package:test/test.dart";
+
+import "sample_file.dart";
+
+void main() {
+  test("run hybrid main", () async {
+    final channel = spawnHybridUri("web_hybrid_main.dart");
+
+    await for (final msg in channel.stream) {
+      final file = SampleFile.fromJson(
+          json.decode(msg as String) as Map<String, dynamic>);
+      print(file.name);
+      expect(await printExifOfBytes(file.getContent()), equals(file.dump),
+          reason: "file=${file.name}");
+    }
+  }, timeout: Timeout.parse("60s"));
+}
diff --git a/pubspec.yaml b/pubspec.yaml
index e93025a..1a9908e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,41 +1,5 @@
 dependency_overrides:
-  adaptive_number:
-    path: ./dependencies/adaptive_number
-  dots_indicator:
-    path: ./dependencies/dots_indicator
-  ed25519_edwards:
-    path: ./dependencies/ed25519_edwards
-  flutter_markdown_plus:
-    path: ./dependencies/flutter_markdown_plus
-  flutter_sharing_intent:
-    path: ./dependencies/flutter_sharing_intent
-  hand_signature:
-    path: ./dependencies/hand_signature
-  hashlib:
-    path: ./dependencies/hashlib
-  hashlib_codecs:
-    path: ./dependencies/hashlib_codecs
-  introduction_screen:
-    path: ./dependencies/introduction_screen
-  libsignal_protocol_dart:
-    path: ./dependencies/libsignal_protocol_dart
-  lottie:
-    path: ./dependencies/lottie
-  mutex:
-    path: ./dependencies/mutex
-  optional:
-    path: ./dependencies/optional
-  photo_view:
-    path: ./dependencies/photo_view
-  pointycastle:
-    path: ./dependencies/pointycastle
-  qr:
-    path: ./dependencies/qr
-  qr_flutter:
-    path: ./dependencies/qr_flutter
-  restart_app:
-    path: ./dependencies/restart_app
-  screen_protector:
-    path: ./dependencies/screen_protector
-  x25519:
-    path: ./dependencies/x25519
+  exif:
+    path: ./dependencies/exif
+  sprintf:
+    path: ./dependencies/sprintf
diff --git a/sprintf/LICENSE b/sprintf/LICENSE
new file mode 100644
index 0000000..49fb54e
--- /dev/null
+++ b/sprintf/LICENSE
@@ -0,0 +1,22 @@
+Copyright (c) 2012, Richard Eames
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this 
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice, 
+   this list of conditions and the following disclaimer in the documentation 
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/sprintf/lib/sprintf.dart b/sprintf/lib/sprintf.dart
new file mode 100644
index 0000000..2cc0abd
--- /dev/null
+++ b/sprintf/lib/sprintf.dart
@@ -0,0 +1,13 @@
+library sprintf;
+
+import 'dart:math';
+
+part 'src/formatters/Formatter.dart';
+part 'src/formatters/int_formatter.dart';
+part 'src/formatters/float_formatter.dart';
+part 'src/formatters/string_formatter.dart';
+part 'src/sprintf_impl.dart';
+
+//typedef SPrintF = String Function(String fmt,  args);
+
+var sprintf = PrintFormat();
diff --git a/sprintf/lib/src/formatters/Formatter.dart b/sprintf/lib/src/formatters/Formatter.dart
new file mode 100644
index 0000000..7def026
--- /dev/null
+++ b/sprintf/lib/src/formatters/Formatter.dart
@@ -0,0 +1,25 @@
+part of sprintf;
+
+abstract class Formatter {
+  var fmt_type;
+  var options;
+
+  Formatter(this.fmt_type, this.options);
+
+  static String get_padding(int count, String pad) {
+    var padding_piece = pad;
+    var padding = StringBuffer();
+
+    while (count > 0) {
+      if ((count & 1) == 1) {
+        padding.write(padding_piece);
+      }
+      count >>= 1;
+      padding_piece = '${padding_piece}${padding_piece}';
+    }
+
+    return padding.toString();
+  }
+
+  String asString();
+}
diff --git a/sprintf/lib/src/formatters/float_formatter.dart b/sprintf/lib/src/formatters/float_formatter.dart
new file mode 100644
index 0000000..a10268d
--- /dev/null
+++ b/sprintf/lib/src/formatters/float_formatter.dart
@@ -0,0 +1,302 @@
+part of sprintf;
+
+class FloatFormatter extends Formatter {
+  // ignore: todo
+  // TODO: can't rely on '.' being the decimal separator
+  static final _number_rx = RegExp(r'^[\-\+]?(\d+)\.(\d+)$');
+  static final _expo_rx = RegExp(r'^[\-\+]?(\d)\.(\d+)e([\-\+]?\d+)$');
+  static final _leading_zeroes_rx = RegExp(r'^(0*)[1-9]+');
+
+  double _arg;
+  final List<int> _digits = [];
+  int _exponent = 0;
+  int _decimal = 0;
+  bool _is_negative = false;
+  bool _has_init = false;
+  String? _output;
+
+  FloatFormatter(this._arg, var fmt_type, var options)
+      : super(fmt_type, options) {
+    if (_arg.isNaN) {
+      _has_init = true;
+      return;
+    }
+
+    if (_arg.isInfinite) {
+      _is_negative = _arg.isNegative;
+      _has_init = true;
+      return;
+    }
+
+    _arg = _arg.toDouble();
+
+    if (_arg < 0) {
+      _is_negative = true;
+      _arg = -_arg;
+    }
+
+    var arg_str =
+        _arg == _arg.truncate() ? _arg.toStringAsFixed(1) : _arg.toString();
+
+    var m1 = _number_rx.firstMatch(arg_str);
+    if (m1 != null) {
+      var int_part = m1.group(1)!;
+      var fraction = m1.group(2)!;
+
+      /*
+       * Cases:
+       * 1.2345    = 1.2345e0  -> [12345]    e+0 d1  l5
+       * 123.45    = 1.2345e2  -> [12345]    e+2 d3  l5
+       * 0.12345   = 1.2345e-1 -> [012345]   e-1 d1  l6
+       * 0.0012345 = 1.2345e-3 -> [00012345] e-3 d1  l8
+       */
+
+      _decimal = int_part.length;
+      _digits.addAll(int_part.split('').map(int.parse));
+      _digits.addAll(fraction.split('').map(int.parse));
+
+      if (int_part.length == 1) {
+        if (int_part == '0') {
+          var leading_zeroes_match = _leading_zeroes_rx.firstMatch(fraction);
+
+          if (leading_zeroes_match != null) {
+            var zeroes_count = leading_zeroes_match.group(1)!.length;
+            // print("zeroes_count=${zeroes_count}");
+            _exponent =
+                zeroes_count > 0 ? -(zeroes_count + 1) : zeroes_count - 1;
+          } else {
+            _exponent = 0;
+          }
+        } // else int_part != 0
+        else {
+          _exponent = 0;
+        }
+      } else {
+        _exponent = int_part.length - 1;
+      }
+    } else {
+      var m2 = _expo_rx.firstMatch(arg_str);
+      if (m2 != null) {
+        var int_part = m2.group(1)!;
+        var fraction = m2.group(2)!;
+        _exponent = int.parse(m2.group(3)!);
+
+        if (_exponent > 0) {
+          var diff = _exponent - fraction.length + 1;
+          _decimal = _exponent + 1;
+          _digits.addAll(int_part.split('').map(int.parse));
+          _digits.addAll(fraction.split('').map(int.parse));
+          _digits.addAll(
+              Formatter.get_padding(diff, '0').split('').map(int.parse));
+        } else {
+          var diff = int_part.length - _exponent - 1;
+          _decimal = int_part.length;
+          _digits.addAll(
+              Formatter.get_padding(diff, '0').split('').map(int.parse));
+          _digits.addAll(int_part.split('').map(int.parse));
+          _digits.addAll(fraction.split('').map(int.parse));
+        }
+      } // else something wrong
+    }
+    _has_init = true;
+    //print("arg_str=${arg_str}");
+    //print("decimal=${_decimal}, exp=${_exponent}, digits=${_digits}");
+  }
+
+  @override
+  String asString() {
+    var ret = '';
+
+    if (!_has_init) {
+      return ret;
+    }
+
+    if (_output != null) {
+      return _output!;
+    }
+
+    if (options['add_space'] && options['sign'] == '' && _arg >= 0) {
+      options['sign'] = ' ';
+    }
+
+    if (_arg.isInfinite) {
+      if (_arg.isNegative) {
+        options['sign'] = '-';
+      }
+
+      ret = 'inf';
+      options['padding_char'] = ' ';
+    }
+
+    if (_arg.isNaN) {
+      ret = 'nan';
+      options['padding_char'] = ' ';
+    }
+
+    if (options['precision'] == -1) {
+      // ignore: todo
+      options['precision'] = 6; // TODO: make this configurable
+    } else if (fmt_type == 'g' && options['precision'] == 0) {
+      options['precision'] = 1;
+    }
+
+    if (_is_negative) {
+      options['sign'] = '-';
+    }
+
+    if (!(_arg.isInfinite || _arg.isNaN)) {
+      if (fmt_type == 'e') {
+        ret = asExponential(options['precision'], remove_trailing_zeros: false);
+      } else if (fmt_type == 'f') {
+        ret = asFixed(options['precision'], remove_trailing_zeros: false);
+      } else {
+        // type == g
+        var _exp = _exponent;
+        var sig_digs = options['precision'];
+        // print("${_exp} ${sig_digs}");
+        if (-4 <= _exp && _exp < options['precision']) {
+          sig_digs -= _decimal;
+          var precision = max<num>(options['precision'] - 1 - _exp, sig_digs);
+
+          ret = asFixed(precision.toInt(),
+              remove_trailing_zeros: !options['alternate_form']);
+        } else {
+          ret = asExponential(options['precision'] - 1,
+              remove_trailing_zeros: !options['alternate_form']);
+        }
+      }
+    }
+
+    var min_chars = options['width'];
+    var str_len = ret.length + options['sign'].length;
+    var padding = '';
+
+    if (min_chars > str_len) {
+      if (options['padding_char'] == '0' && !options['left_align']) {
+        padding = Formatter.get_padding(min_chars - str_len, '0');
+      } else {
+        padding = Formatter.get_padding(min_chars - str_len, ' ');
+      }
+    }
+
+    if (options['left_align']) {
+      ret = "${options['sign']}${ret}${padding}";
+    } else if (options['padding_char'] == '0') {
+      ret = "${options['sign']}${padding}${ret}";
+    } else {
+      ret = "${padding}${options['sign']}${ret}";
+    }
+
+    if (options['is_upper']) {
+      ret = ret.toUpperCase();
+    }
+
+    return (_output = ret);
+  }
+
+  String asFixed(int precision, {bool remove_trailing_zeros = true}) {
+    // precision is the number of decimal places after the decimal point to keep
+    var offset = _decimal + precision - 1;
+    var extra_zeroes = precision - (_digits.length - offset);
+
+    if (extra_zeroes > 0) {
+      _digits.addAll(
+          Formatter.get_padding(extra_zeroes, '0').split('').map(int.parse));
+    }
+
+    _round(offset + 1, offset);
+
+    var ret = _digits.sublist(0, _decimal).fold('', (i, e) => '${i}${e}');
+    var trailing_digits = _digits.sublist(_decimal, _decimal + precision);
+    if (remove_trailing_zeros) {
+      trailing_digits = _remove_trailing_zeros(trailing_digits);
+    }
+    var trailing_zeroes = trailing_digits.fold('', (i, e) => '${i}${e}');
+    if (trailing_zeroes.isEmpty) {
+      return ret;
+    }
+    ret = '${ret}.${trailing_zeroes}';
+
+    return ret;
+  }
+
+  String asExponential(int precision, {bool remove_trailing_zeros = true}) {
+    var offset = _decimal - _exponent;
+
+    var extra_zeroes = precision - (_digits.length - offset) + 1;
+
+    if (extra_zeroes > 0) {
+      _digits.addAll(
+          Formatter.get_padding(extra_zeroes, '0').split('').map(int.parse));
+    }
+
+    _round(offset + precision, offset);
+
+    var ret = _digits[offset - 1].toString();
+    //print ("(${offset}, ${precision})${_digits}");
+    var trailing_digits = _digits.sublist(offset, offset + precision);
+    // print ("trailing_digits=${trailing_digits}");
+    var _exp_str = _exponent.abs().toString();
+
+    if (_exponent < 10 && _exponent > -10) {
+      _exp_str = '0${_exp_str}';
+    }
+
+    _exp_str = (_exponent < 0) ? 'e-${_exp_str}' : 'e+${_exp_str}';
+
+    if (remove_trailing_zeros) {
+      trailing_digits = _remove_trailing_zeros(trailing_digits);
+    }
+
+    if (trailing_digits.isNotEmpty) {
+      ret += '.';
+    }
+
+    ret = trailing_digits.fold(ret, (i, e) => '${i}${e}');
+    ret = '${ret}${_exp_str}';
+
+    return ret;
+  }
+
+  List<int> _remove_trailing_zeros(List<int> trailing_digits) {
+    var nzeroes = 0;
+    for (var i = trailing_digits.length - 1; i >= 0; i--) {
+      if (trailing_digits[i] == 0) {
+        nzeroes++;
+      } else {
+        break;
+      }
+    }
+    return trailing_digits.sublist(0, trailing_digits.length - nzeroes);
+  }
+
+  /*
+	rounding_offset: Where to start rounding from
+	offset: where to end rounding
+	 */
+  void _round(var rounding_offset, var offset) {
+    var carry = 0;
+
+    if (rounding_offset >= _digits.length) {
+      return;
+    }
+    // Round the digit after the precision
+    var d = _digits[rounding_offset];
+    carry = d >= 5 ? 1 : 0;
+    _digits[rounding_offset] = d % 10;
+    rounding_offset -= 1;
+
+    //propagate the carry
+    while (carry > 0) {
+      d = _digits[rounding_offset] + carry;
+      if (rounding_offset == 0 && d > 9) {
+        _digits.insert(0, 0);
+        _decimal += 1;
+        rounding_offset += 1;
+      }
+      carry = d < 10 ? 0 : 1;
+      _digits[rounding_offset] = d % 10;
+      rounding_offset -= 1;
+    }
+  }
+}
diff --git a/sprintf/lib/src/formatters/int_formatter.dart b/sprintf/lib/src/formatters/int_formatter.dart
new file mode 100644
index 0000000..e4c8c68
--- /dev/null
+++ b/sprintf/lib/src/formatters/int_formatter.dart
@@ -0,0 +1,92 @@
+part of sprintf;
+
+class IntFormatter extends Formatter {
+  int _arg;
+  static const int MAX_INT = 0x1FFFFFFFFFFFFF; // javascript 53bit
+
+  IntFormatter(this._arg, var fmt_type, var options) : super(fmt_type, options);
+
+  @override
+  String asString() {
+    var ret = '';
+    var prefix = '';
+
+    var radix = fmt_type == 'x' ? 16 : (fmt_type == 'o' ? 8 : 10);
+
+    if (_arg < 0) {
+      if (radix == 10) {
+        _arg = _arg.abs();
+        options['sign'] = '-';
+      } else {
+        // sort of reverse twos complement
+        _arg = (MAX_INT - (~_arg) & MAX_INT);
+      }
+    }
+
+    ret = _arg.toRadixString(radix);
+
+    if (options['alternate_form']) {
+      if (radix == 16 && _arg != 0) {
+        prefix = '0x';
+      } else if (radix == 8 && _arg != 0) {
+        prefix = '0';
+      }
+      if (options['sign'] == '+' && radix != 10) {
+        options['sign'] = '';
+      }
+    }
+
+    // space "prefixes non-negative signed numbers with a space"
+    if ((options['add_space'] &&
+        options['sign'] == '' &&
+        _arg > -1 &&
+        radix == 10)) {
+      options['sign'] = ' ';
+    }
+
+    if (radix != 10) {
+      options['sign'] = '';
+    }
+
+    var padding = '';
+    var min_digits = options['precision'];
+    var min_chars = options['width'];
+    var num_length = ret.length;
+    var sign_length = options['sign'].length;
+    num str_len = 0;
+
+    if (radix == 8 && min_chars <= min_digits) {
+      num_length += prefix.length;
+    }
+
+    if (min_digits > num_length) {
+      padding = Formatter.get_padding(min_digits - num_length, '0');
+      ret = '${padding}${ret}';
+      num_length = ret.length;
+      padding = '';
+    }
+
+    str_len = num_length + sign_length + prefix.length;
+    if (min_chars > str_len) {
+      if (options['padding_char'] == '0' && !options['left_align']) {
+        padding = Formatter.get_padding(min_chars - str_len, '0');
+      } else {
+        padding = Formatter.get_padding(min_chars - str_len, ' ');
+      }
+    }
+
+    if (options['left_align']) {
+      ret = "${options['sign']}${prefix}${ret}${padding}";
+    } else if (options['padding_char'] == '0') {
+      ret = "${options['sign']}${prefix}${padding}${ret}";
+    } else {
+      ret = "${padding}${options['sign']}${prefix}${ret}";
+    }
+
+    if (options['is_upper']) {
+      ret = ret.toUpperCase();
+    }
+
+    return ret;
+  }
+}
diff --git a/sprintf/lib/src/formatters/string_formatter.dart b/sprintf/lib/src/formatters/string_formatter.dart
new file mode 100644
index 0000000..05d690b
--- /dev/null
+++ b/sprintf/lib/src/formatters/string_formatter.dart
@@ -0,0 +1,32 @@
+part of sprintf;
+
+class StringFormatter extends Formatter {
+  var _arg;
+
+  StringFormatter(this._arg, var fmt_type, var options)
+      : super(fmt_type, options) {
+    options['padding_char'] = ' ';
+  }
+  @override
+  String asString() {
+    var ret = _arg.toString();
+
+    if (options['precision'] > -1 && options['precision'] <= ret.length) {
+      ret = ret.substring(0, options['precision']);
+    }
+
+    if (options['width'] > -1) {
+      int diff = (options['width'] - ret.length);
+
+      if (diff > 0) {
+        var padding = Formatter.get_padding(diff, options['padding_char']);
+        if (!options['left_align']) {
+          ret = '${padding}${ret}';
+        } else {
+          ret = '${ret}${padding}';
+        }
+      }
+    }
+    return ret;
+  }
+}
diff --git a/sprintf/lib/src/sprintf_impl.dart b/sprintf/lib/src/sprintf_impl.dart
new file mode 100644
index 0000000..08051e0
--- /dev/null
+++ b/sprintf/lib/src/sprintf_impl.dart
@@ -0,0 +1,120 @@
+part of sprintf;
+
+typedef PrintFormatFormatter = Formatter Function(dynamic arg, dynamic options);
+//typedef Formatter PrintFormatFormatter(arg, options);
+
+class PrintFormat {
+  static final RegExp specifier = RegExp(
+      r'%(?:(\d+)\$)?([\+\-\#0 ]*)(\d+|\*)?(?:\.(\d+|\*))?([a-z%])',
+      caseSensitive: false);
+  static final RegExp uppercase_rx = RegExp(r'[A-Z]', caseSensitive: true);
+
+  final Map<String, PrintFormatFormatter> _formatters = {
+    'i': (arg, options) => IntFormatter(arg, 'i', options),
+    'd': (arg, options) => IntFormatter(arg, 'd', options),
+    'x': (arg, options) => IntFormatter(arg, 'x', options),
+    'X': (arg, options) => IntFormatter(arg, 'x', options),
+    'o': (arg, options) => IntFormatter(arg, 'o', options),
+    'O': (arg, options) => IntFormatter(arg, 'o', options),
+    'e': (arg, options) => FloatFormatter(arg, 'e', options),
+    'E': (arg, options) => FloatFormatter(arg, 'e', options),
+    'f': (arg, options) => FloatFormatter(arg, 'f', options),
+    'F': (arg, options) => FloatFormatter(arg, 'f', options),
+    'g': (arg, options) => FloatFormatter(arg, 'g', options),
+    'G': (arg, options) => FloatFormatter(arg, 'g', options),
+    's': (arg, options) => StringFormatter(arg, 's', options),
+  };
+
+  String call(String fmt, var args) {
+    var ret = '';
+
+    var offset = 0;
+    var arg_offset = 0;
+
+    if (args is! List) {
+      throw ArgumentError('Expecting list as second argument');
+    }
+
+    for (var m in specifier.allMatches(fmt)) {
+      var _parameter = m[1];
+      var _flags = m[2]!;
+      var _width = m[3];
+      var _precision = m[4];
+      var _type = m[5]!;
+
+      var _arg_str = '';
+      var _options = {
+        'is_upper': false,
+        'width': -1,
+        'precision': -1,
+        'length': -1,
+        'radix': 10,
+        'sign': '',
+        'specifier_type': _type,
+      };
+
+      _parse_flags(_flags).forEach((var k, var v) {
+        _options[k] = v;
+      });
+
+      // The argument we want to deal with
+      var _arg = _parameter == null ? null : args[int.parse(_parameter) - 1];
+
+      // parse width
+      if (_width != null) {
+        _options['width'] =
+            (_width == '*' ? args[arg_offset++] : int.parse(_width));
+      }
+
+      // parse precision
+      if (_precision != null) {
+        _options['precision'] =
+            (_precision == '*' ? args[arg_offset++] : int.parse(_precision));
+      }
+
+      // grab the argument we'll be dealing with
+      if (_arg == null && _type != '%') {
+        _arg = args[arg_offset++];
+      }
+
+      _options['is_upper'] = uppercase_rx.hasMatch(_type);
+
+      if (_type == '%') {
+        if (_flags.isNotEmpty || _width != null || _precision != null) {
+          throw Exception('"%" does not take any flags');
+        }
+        _arg_str = '%';
+      } else if (_formatters.containsKey(_type)) {
+        _arg_str = _formatters[_type]!(_arg, _options).asString();
+      } else {
+        throw ArgumentError('Unknown format type ${_type}');
+      }
+
+      // Add the pre-format string to the return
+      ret += fmt.substring(offset, m.start);
+      offset = m.end;
+
+      ret += _arg_str;
+    }
+
+    return ret += fmt.substring(offset);
+  }
+
+  void register_specifier(String specifier, PrintFormatFormatter formatter) {
+    _formatters[specifier] = formatter;
+  }
+
+  void unregistier_specifier(String specifier) {
+    _formatters.remove(specifier);
+  }
+
+  Map _parse_flags(String flags) {
+    return {
+      'sign': flags.contains('+') ? '+' : '',
+      'padding_char': flags.contains('0') ? '0' : ' ',
+      'add_space': flags.contains(' '),
+      'left_align': flags.contains('-'),
+      'alternate_form': flags.contains('#'),
+    };
+  }
+}
diff --git a/sprintf/pubspec.yaml b/sprintf/pubspec.yaml
new file mode 100644
index 0000000..037797e
--- /dev/null
+++ b/sprintf/pubspec.yaml
@@ -0,0 +1,12 @@
+name: sprintf
+version: 7.0.0
+description: Dart implementation of sprintf. Provides simple printf like
+  formatting such as sprintf("hello %s", ["world"]);
+homepage: https://github.com/Naddiseo/dart-sprintf
+
+environment:
+  sdk: ">=2.12.0-0 <3.0.0"
+
+dev_dependencies:
+  test: ^1.16.0-nullsafety.13
+  lints: ^1.0.1
diff --git a/sprintf/test/sprintf_test.dart b/sprintf/test/sprintf_test.dart
new file mode 100644
index 0000000..aafa176
--- /dev/null
+++ b/sprintf/test/sprintf_test.dart
@@ -0,0 +1,225 @@
+library sprintf_test;
+
+import 'package:test/test.dart';
+
+import 'package:sprintf/sprintf.dart';
+
+part 'testing_data.dart';
+
+void test_testdata() {
+  expectedTestData.forEach((prefix, type_map) {
+    group('"%$prefix Tests, ', () {
+      type_map.forEach((type, expected_array) {
+        var fmt = '|%${prefix}${type}|';
+        var input_array = expectedTestInputData[type]!;
+
+        assert(input_array.length == expected_array.length);
+
+        for (var i = 0; i < input_array.length - 1; i++) {
+          var raw_input = input_array[i];
+          var expected = expected_array[i];
+          final input = raw_input is! List ? [raw_input] : raw_input;
+
+          if (expected == '"throwsA"') {
+            test('Expecting "${fmt}".format(${raw_input}) to throw',
+                () => expect(() => sprintf(fmt, input), throwsA(anything)));
+          } else {
+            test('"${fmt}".format(${raw_input}) == "${expected}"',
+                () => expect(sprintf(fmt, input), expected));
+          }
+        }
+      }); // type_map
+    }); // group
+  }); // _expected
+}
+
+void test_bug0001() {
+  test('|%x|%X| 255', () => expect(sprintf('|%x|%X|', [255, 255]), '|ff|FF|'));
+}
+
+void test_bug0006a() {
+  test('|%.0f| 5.466', () => expect(sprintf('|%.0f|', [5.466]), '|5|'));
+  test('|%.0g| 5.466', () => expect(sprintf('|%.0g|', [5.466]), '|5|'));
+  test('|%.0e| 5.466', () => expect(sprintf('|%.0e|', [5.466]), '|5e+00|'));
+}
+
+void test_bug0006b() {
+  test('|%.2f| 5.466', () => expect(sprintf('|%.2f|', [5.466]), '|5.47|'));
+  test('|%.2g| 5.466', () => expect(sprintf('|%.2g|', [5.466]), '|5.5|'));
+  test('|%.2e| 5.466', () => expect(sprintf('|%.2e|', [5.466]), '|5.47e+00|'));
+}
+
+void test_bug0009() {
+  test('|%.2f| 2.09846', () => expect(sprintf('|%.2f|', [2.09846]), '|2.10|'));
+}
+
+void test_bug0010() {
+  test('|%.1f| 5.34', () => expect(sprintf('|%.1f|', [5.34]), '|5.3|'));
+  test('|%.1f| 22.51', () => expect(sprintf('|%.1f|', [22.51]), '|22.5|'));
+  test('|%.0f| 22.5', () => expect(sprintf('|%.0f|', [22.5]), '|23|'));
+  test('|%.0f| 22.77', () => expect(sprintf('|%.0f|', [22.77]), '|23|'));
+}
+
+void test_javascript_decimal_limit() {
+  test(
+      '%d 9007199254740991',
+      () => expect(
+          sprintf('|%d|', [9007199254740991 + 0]), '|9007199254740991|'));
+  //test('%d 9007199254740992', () => expect(sprintf('|%d|', [9007199254740991+1]), '|0|'));
+  //test('%d 9007199254740993', () => expect(sprintf('|%d|', [9007199254740991+2]), '|1|'));
+
+  test(
+      '%x 9007199254740991',
+      () =>
+          expect(sprintf('|%x|', [9007199254740991 + 0]), '|1fffffffffffff|'));
+  //test('%x 9007199254740992', () => expect(sprintf('|%x|', [9007199254740991+1]), '|0|'));
+  //test('%x 9007199254740993', () => expect(sprintf('|%x|', [9007199254740991+2]), '|1|'));
+
+  test('%x -9007199254740991',
+      () => expect(sprintf('|%x|', [-9007199254740991 + 0]), '|1|'));
+  //test('%x -9007199254740992', () => expect(sprintf('|%x|', [-9007199254740991+1]), '|2|'));
+  //test('%x -9007199254740993', () => expect(sprintf('|%x|', [-9007199254740991+2]), '|3|'));
+}
+
+void test_unsigned_neg_to_53bits() {
+  test('|%x|%X| -0', () => expect(sprintf('|%x|%X|', [-0, -0]), '|0|0|'));
+  test(
+      '|%x|%X| -1',
+      () => expect(
+          sprintf('|%x|%X|', [-1, -1]), '|1fffffffffffff|1FFFFFFFFFFFFF|'));
+  test(
+      '|%x|%X| -2',
+      () => expect(
+          sprintf('|%x|%X|', [-2, -2]), '|1ffffffffffffe|1FFFFFFFFFFFFE|'));
+}
+
+void test_int_formatting() {
+  test('|%+d|% d| 2', () => expect(sprintf('|%+d|% d|', [2, 2]), '|+2| 2|'));
+  test('|%+d|% d| -2', () => expect(sprintf('|%+d|% d|', [-2, -2]), '|-2|-2|'));
+  test(
+      '|%+x|% X|%#x| -2',
+      () => expect(sprintf('|%+x|% X|%#x|', [-2, -2, -2]),
+          '|1ffffffffffffe|1FFFFFFFFFFFFE|0x1ffffffffffffe|'));
+}
+
+void test_large_exponents_e() {
+  test('|%e| 1.79e+308',
+      () => expect(sprintf('|%e|', [1.79e+308]), '|1.790000e+308|'));
+  test('|%e| 1.79e-308',
+      () => expect(sprintf('|%e|', [1.79e-308]), '|1.790000e-308|'));
+  test('|%e| -1.79e+308',
+      () => expect(sprintf('|%e|', [-1.79e+308]), '|-1.790000e+308|'));
+  test('|%e| -1.79e-308',
+      () => expect(sprintf('|%e|', [-1.79e-308]), '|-1.790000e-308|'));
+}
+
+void test_large_exponents_g() {
+  test('|%g| 1.79e+308',
+      () => expect(sprintf('|%g|', [1.79e+308]), '|1.79e+308|'));
+  test('|%g| 1.79e-308',
+      () => expect(sprintf('|%g|', [1.79e-308]), '|1.79e-308|'));
+  test('|%g| -1.79e+308',
+      () => expect(sprintf('|%g|', [-1.79e+308]), '|-1.79e+308|'));
+  test('|%g| -1.79e-308',
+      () => expect(sprintf('|%g|', [-1.79e-308]), '|-1.79e-308|'));
+}
+
+void test_large_exponents_f() {
+  // ignore: todo
+  // TODO: C's printf introduces errors after 20 decimal places
+  test('|%f| 1.79e+308',
+      () => expect(sprintf('|%.3f|', [1.79e+308]), '|1.79e+308|'));
+  test('|%f| 1.79e-308',
+      () => expect(sprintf('|%f|', [1.79e-308]), '|1.790000e-308|'));
+  test('|%f| -1.79e+308',
+      () => expect(sprintf('|%f|', [-1.79e+308]), '|-1.790000e+308|'));
+  test('|%f| -1.79e-308',
+      () => expect(sprintf('|%f|', [-1.79e-308]), '|-1.790000e-308|'));
+}
+
+void test_object_to_string() {
+  var list = ['foo', 'bar'];
+  test("|%s| ['foo', 'bar'].toString()",
+      () => expect(sprintf('%s', [list]), '[foo, bar]'));
+}
+
+void test_round_bug0015() {
+  var n = 1;
+  test('|%.0f| 1', () => expect(sprintf('|%.0f|', [n]), '|1|'));
+  test('|%.1f| 1', () => expect(sprintf('|%.1f|', [n]), '|1.0|'));
+  test('|%.2f| 1', () => expect(sprintf('|%.2f|', [n]), '|1.00|'));
+
+  test('|%.0f| 1.234', () => expect(sprintf('|%.0f|', [1.234]), '|1|'));
+  test('|%.1f| 1.234', () => expect(sprintf('|%.1f|', [1.234]), '|1.2|'));
+  test('|%.2f| 1.234', () => expect(sprintf('|%.2f|', [1.234]), '|1.23|'));
+
+  test('|%.0f| 1.235', () => expect(sprintf('|%.0f|', [1.235]), '|1|'));
+  test('|%.1f| 1.235', () => expect(sprintf('|%.1f|', [1.235]), '|1.2|'));
+  test('|%.2f| 1.235', () => expect(sprintf('|%.2f|', [1.235]), '|1.24|'));
+}
+
+void test_bug0018() {
+  test(
+      '|%10.4f| 1.0', () => expect(sprintf('|%10.4f|', [1.0]), '|    1.0000|'));
+}
+
+void test_bug0022() {
+  test('|%2\$d %2\$d %1\$d|',
+      () => expect(sprintf('|%2\$d %2\$d %1\$d|', [5, 10]), '|10 10 5|'));
+
+  // these next two are from the sprintf manual, and should print the same
+  test('|%*d|', () => expect(sprintf('|%*d|', [5, 10]), '|   10|'));
+  test('|%2\$*1\$d|', () => expect(sprintf('|%*d|', [5, 10]), '|   10|'));
+}
+
+void test_bug0033() {
+  var inf = 1.0 / 0.0;
+  var nan = 0.0 / 0.0;
+  test(
+      '|%g %G| Infinity',
+      () => expect(sprintf('|%g %g %G %G|', [inf, -inf, inf, -inf]),
+          '|inf -inf INF -INF|'));
+  test(
+      '|%g %G| NaN', () => expect(sprintf('|%g %G|', [nan, nan]), '|nan NAN|'));
+
+  test(
+      '|%f %F| Infinity',
+      () => expect(sprintf('|%f %f %F %F|', [inf, -inf, inf, -inf]),
+          '|inf -inf INF -INF|'));
+  test(
+      '|%f %F| NaN', () => expect(sprintf('|%f %F|', [nan, nan]), '|nan NAN|'));
+}
+
+void main() {
+  test_bug0022();
+
+  test('|%6.6g -1.79e+20',
+      () => expect(sprintf('|%6.6g|', [-1.79E+20]), '|-1.79e+20|'));
+  test('|%6.6G -1.79e+20',
+      () => expect(sprintf('|%6.6G|', [-1.79E+20]), '|-1.79E+20|'));
+  test_bug0018();
+
+  //test_bug0009();
+  //test_bug0010();
+  //test('|%f| 1.79E+308', () => expect(sprintf('|%f|', [1.79e+308]), '|1.79e+308|'));
+  test_unsigned_neg_to_53bits();
+  test_int_formatting();
+
+  test_javascript_decimal_limit();
+  if (true) {
+    test_testdata();
+    test_large_exponents_e();
+    test_large_exponents_g();
+    //test_large_exponents_f();
+
+    test_bug0001();
+    test_bug0006a();
+    test_bug0006b();
+
+    test_bug0009();
+    test_bug0010();
+
+    test_object_to_string();
+  }
+  test_bug0033();
+}
diff --git a/sprintf/test/testing_data.dart b/sprintf/test/testing_data.dart
new file mode 100644
index 0000000..640044c
--- /dev/null
+++ b/sprintf/test/testing_data.dart
@@ -0,0 +1,12140 @@
+part of sprintf_test;
+
+var expectedTestData = {
+  '': {
+    '%': ['|%|', '|%|', '|%|', '|%|', '|%|'],
+    'E': [
+      '|1.230000E+02|',
+      '|-1.230000E+02|',
+      '|0.000000E+00|',
+      '|1.790000E+20|',
+      '|-1.790000E+20|',
+      '|1.790000E-20|',
+      '|-1.790000E-20|',
+      '|5.444447E+00|',
+      '|2.100000E+00|'
+    ],
+    'F': [
+      '|123.000000|',
+      '|-123.000000|',
+      '|0.000000|',
+      '|179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '|0.000000|',
+      '|-0.000000|',
+      '|5.444447|',
+      '|2.100000|'
+    ],
+    'G': [
+      '|123|',
+      '|-123|',
+      '|0|',
+      '|1.79E+20|',
+      '|-1.79E+20|',
+      '|1.79E-20|',
+      '|-1.79E-20|',
+      '|5.44445|',
+      '|2.1|'
+    ],
+    'X': ['|7B|', '|1FFFFFFFFFFF85|', '|0|', '|1FFFFFFFFFFFFF|', '|1|'],
+    'd': [
+      '|123|',
+      '|-123|',
+      '|0|',
+      '|9007199254740991|',
+      '|-9007199254740991|'
+    ],
+    'e': [
+      '|1.230000e+02|',
+      '|-1.230000e+02|',
+      '|0.000000e+00|',
+      '|1.790000e+20|',
+      '|-1.790000e+20|',
+      '|1.790000e-20|',
+      '|-1.790000e-20|',
+      '|5.444447e+00|',
+      '|2.100000e+00|'
+    ],
+    'f': [
+      '|123.000000|',
+      '|-123.000000|',
+      '|0.000000|',
+      '|179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '|0.000000|',
+      '|-0.000000|',
+      '|5.444447|',
+      '|2.100000|'
+    ],
+    'g': [
+      '|123|',
+      '|-123|',
+      '|0|',
+      '|1.79e+20|',
+      '|-1.79e+20|',
+      '|1.79e-20|',
+      '|-1.79e-20|',
+      '|5.44445|',
+      '|2.1|'
+    ],
+    'o': [
+      '|173|',
+      '|377777777777777605|',
+      '|0|',
+      '|377777777777777777|',
+      '|1|'
+    ],
+    's': ['||', '|Hello World|'],
+    'x': ['|7b|', '|1fffffffffff85|', '|0|', '|1fffffffffffff|', '|1|']
+  },
+  ' ': {
+    '%': ['"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"'],
+    'E': [
+      '| 1.230000E+02|',
+      '|-1.230000E+02|',
+      '| 0.000000E+00|',
+      '| 1.790000E+20|',
+      '|-1.790000E+20|',
+      '| 1.790000E-20|',
+      '|-1.790000E-20|',
+      '| 5.444447E+00|',
+      '| 2.100000E+00|'
+    ],
+    'F': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'G': [
+      '| 123|',
+      '|-123|',
+      '| 0|',
+      '| 1.79E+20|',
+      '|-1.79E+20|',
+      '| 1.79E-20|',
+      '|-1.79E-20|',
+      '| 5.44445|',
+      '| 2.1|'
+    ],
+    'X': ['|7B|', '|1FFFFFFFFFFF85|', '|0|', '|1FFFFFFFFFFFFF|', '|1|'],
+    'd': [
+      '| 123|',
+      '|-123|',
+      '| 0|',
+      '| 9007199254740991|',
+      '|-9007199254740991|'
+    ],
+    'e': [
+      '| 1.230000e+02|',
+      '|-1.230000e+02|',
+      '| 0.000000e+00|',
+      '| 1.790000e+20|',
+      '|-1.790000e+20|',
+      '| 1.790000e-20|',
+      '|-1.790000e-20|',
+      '| 5.444447e+00|',
+      '| 2.100000e+00|'
+    ],
+    'f': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'g': [
+      '| 123|',
+      '|-123|',
+      '| 0|',
+      '| 1.79e+20|',
+      '|-1.79e+20|',
+      '| 1.79e-20|',
+      '|-1.79e-20|',
+      '| 5.44445|',
+      '| 2.1|'
+    ],
+    'o': [
+      '|173|',
+      '|377777777777777605|',
+      '|0|',
+      '|377777777777777777|',
+      '|1|'
+    ],
+    's': ['||', '|Hello World|'],
+    'x': ['|7b|', '|1fffffffffff85|', '|0|', '|1fffffffffffff|', '|1|']
+  },
+  ' #': {
+    '%': ['"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"'],
+    'E': [
+      '| 1.230000E+02|',
+      '|-1.230000E+02|',
+      '| 0.000000E+00|',
+      '| 1.790000E+20|',
+      '|-1.790000E+20|',
+      '| 1.790000E-20|',
+      '|-1.790000E-20|',
+      '| 5.444447E+00|',
+      '| 2.100000E+00|'
+    ],
+    'F': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'G': [
+      '| 123.000|',
+      '|-123.000|',
+      '| 0.00000|',
+      '| 1.79000E+20|',
+      '|-1.79000E+20|',
+      '| 1.79000E-20|',
+      '|-1.79000E-20|',
+      '| 5.44445|',
+      '| 2.10000|'
+    ],
+    'X': ['|0X7B|', '|0X1FFFFFFFFFFF85|', '|0|', '|0X1FFFFFFFFFFFFF|', '|0X1|'],
+    'd': [
+      '| 123|',
+      '|-123|',
+      '| 0|',
+      '| 9007199254740991|',
+      '|-9007199254740991|'
+    ],
+    'e': [
+      '| 1.230000e+02|',
+      '|-1.230000e+02|',
+      '| 0.000000e+00|',
+      '| 1.790000e+20|',
+      '|-1.790000e+20|',
+      '| 1.790000e-20|',
+      '|-1.790000e-20|',
+      '| 5.444447e+00|',
+      '| 2.100000e+00|'
+    ],
+    'f': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'g': [
+      '| 123.000|',
+      '|-123.000|',
+      '| 0.00000|',
+      '| 1.79000e+20|',
+      '|-1.79000e+20|',
+      '| 1.79000e-20|',
+      '|-1.79000e-20|',
+      '| 5.44445|',
+      '| 2.10000|'
+    ],
+    'o': [
+      '|0173|',
+      '|0377777777777777605|',
+      '|0|',
+      '|0377777777777777777|',
+      '|01|'
+    ],
+    's': ['||', '|Hello World|'],
+    'x': ['|0x7b|', '|0x1fffffffffff85|', '|0|', '|0x1fffffffffffff|', '|0x1|']
+  },
+  ' #.6': {
+    '%': ['"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"'],
+    'E': [
+      '| 1.230000E+02|',
+      '|-1.230000E+02|',
+      '| 0.000000E+00|',
+      '| 1.790000E+20|',
+      '|-1.790000E+20|',
+      '| 1.790000E-20|',
+      '|-1.790000E-20|',
+      '| 5.444447E+00|',
+      '| 2.100000E+00|'
+    ],
+    'F': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'G': [
+      '| 123.000|',
+      '|-123.000|',
+      '| 0.00000|',
+      '| 1.79000E+20|',
+      '|-1.79000E+20|',
+      '| 1.79000E-20|',
+      '|-1.79000E-20|',
+      '| 5.44445|',
+      '| 2.10000|'
+    ],
+    'X': [
+      '|0X00007B|',
+      '|0X1FFFFFFFFFFF85|',
+      '|000000|',
+      '|0X1FFFFFFFFFFFFF|',
+      '|0X000001|'
+    ],
+    'd': [
+      '| 000123|',
+      '|-000123|',
+      '| 000000|',
+      '| 9007199254740991|',
+      '|-9007199254740991|'
+    ],
+    'e': [
+      '| 1.230000e+02|',
+      '|-1.230000e+02|',
+      '| 0.000000e+00|',
+      '| 1.790000e+20|',
+      '|-1.790000e+20|',
+      '| 1.790000e-20|',
+      '|-1.790000e-20|',
+      '| 5.444447e+00|',
+      '| 2.100000e+00|'
+    ],
+    'f': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'g': [
+      '| 123.000|',
+      '|-123.000|',
+      '| 0.00000|',
+      '| 1.79000e+20|',
+      '|-1.79000e+20|',
+      '| 1.79000e-20|',
+      '|-1.79000e-20|',
+      '| 5.44445|',
+      '| 2.10000|'
+    ],
+    'o': [
+      '|000173|',
+      '|0377777777777777605|',
+      '|000000|',
+      '|0377777777777777777|',
+      '|000001|'
+    ],
+    's': ['||', '|Hello |'],
+    'x': [
+      '|0x00007b|',
+      '|0x1fffffffffff85|',
+      '|000000|',
+      '|0x1fffffffffffff|',
+      '|0x000001|'
+    ]
+  },
+  ' #0': {
+    '%': ['"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"', '"throwsA"'],
+    'E': [
+      '| 1.230000E+02|',
+      '|-1.230000E+02|',
+      '| 0.000000E+00|',
+      '| 1.790000E+20|',
+      '|-1.790000E+20|',
+      '| 1.790000E-20|',
+      '|-1.790000E-20|',
+      '| 5.444447E+00|',
+      '| 2.100000E+00|'
+    ],
+    'F': [
+      '| 123.000000|',
+      '|-123.000000|',
+      '| 0.000000|',
+      '| 179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '| 0.000000|',
+      '|-0.000000|',
+      '| 5.444447|',
+      '| 2.100000|'
+    ],
+    'G': [
+      '| 123.000|',
+      '|-123.000|',
+      '| 0.00000|',
+      '| 1.79000E+20|',
+      '|-1.79000E+20|',
+      '| 1.79000E-20|',
+      '|-1.79000E-20|',
+      '| 5.44445|',
+      '| 2.10000|'
+    ],
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+    'X': [
+      '|00007B|',
+      '|1FFFFFFFFFFF85|',
+      '|000000|',
+      '|1FFFFFFFFFFFFF|',
+      '|000001|'
+    ],
+    'd': [
+      '|000123|',
+      '|-000123|',
+      '|000000|',
+      '|9007199254740991|',
+      '|-9007199254740991|'
+    ],
+    'e': [
+      '|1.230000e+02|',
+      '|-1.230000e+02|',
+      '|0.000000e+00|',
+      '|1.790000e+20|',
+      '|-1.790000e+20|',
+      '|1.790000e-20|',
+      '|-1.790000e-20|',
+      '|5.444447e+00|',
+      '|2.100000e+00|'
+    ],
+    'f': [
+      '|123.000000|',
+      '|-123.000000|',
+      '|0.000000|',
+      '|179000000000000000000.000000|',
+      '|-179000000000000000000.000000|',
+      '|0.000000|',
+      '|-0.000000|',
+      '|5.444447|',
+      '|2.100000|'
+    ],
+    'g': [
+      '|   123|',
+      '|  -123|',
+      '|     0|',
+      '|1.79e+20|',
+      '|-1.79e+20|',
+      '|1.79e-20|',
+      '|-1.79e-20|',
+      '|5.44445|',
+      '|   2.1|'
+    ],
+    'o': [
+      '|000173|',
+      '|377777777777777605|',
+      '|000000|',
+      '|377777777777777777|',
+      '|000001|'
+    ],
+    's': ['|      |', '|Hello |'],
+    'x': [
+      '|00007b|',
+      '|1fffffffffff85|',
+      '|000000|',
+      '|1fffffffffffff|',
+      '|000001|'
+    ]
+  }
+};
+var expectedTestInputData = {
+  '%': [1, -1, 'a', 'asdf', 123],
+  'E': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'F': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'G': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'X': [123, -123, 0, 9007199254740991, -9007199254740991],
+  'd': [123, -123, 0, 9007199254740991, -9007199254740991],
+  'e': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'f': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'g': [
+    123.0,
+    -123.0,
+    0.0,
+    1.79e+20,
+    -1.79e+20,
+    1.79e-20,
+    -1.79e-20,
+    5.4444466,
+    2.0999995
+  ],
+  'o': [123, -123, 0, 9007199254740991, -9007199254740991],
+  's': ['', 'Hello World'],
+  'x': [123, -123, 0, 9007199254740991, -9007199254740991]
+};
diff --git a/update.py b/update.py
index 018c534..1670a97 100644
--- a/update.py
+++ b/update.py
@@ -1,13 +1,18 @@
-import yaml # pip install PyYAML
+import yaml  # pip install PyYAML
 import os
 import shutil
 import subprocess
+import argparse
+
+# Set up command-line argument parsing
+parser = argparse.ArgumentParser(description="Update specific or all repositories.")
+parser.add_argument('repo_name', nargs='?', default=None, help="Name of the repository to update (optional)")
+args = parser.parse_args()
 
 with open("config.yaml", "r") as f:
     config = yaml.safe_load(f)
 
 config_lock = {}
-
 LOCK_FILE_NAME = "config.lock.yaml"
 
 if os.path.exists(LOCK_FILE_NAME):
@@ -43,10 +48,10 @@ def integrate_package(folder_name, data):
 
     repo_url = data['git']
     keep_list = ["lib", "test", "LICENSE", "pubspec.yaml", "android", "ios"]
+    
     if "keep" in data:
         keep_list += [item.rstrip('/') for item in data['keep']]
     
-    
     print(f"Processing {folder_name}...")
 
     if os.path.exists(folder_name):
@@ -62,7 +67,6 @@ def integrate_package(folder_name, data):
         subprocess.run(["git", "checkout", config_lock[folder_name]], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, cwd=folder_name)
     else:
         config_lock[folder_name] = last_commit_hash 
-    
 
     for item in os.listdir(folder_name):
         if item not in keep_list:
@@ -77,21 +81,25 @@ pubspec = {
     "dependency_overrides": {},
 }
 
-for folder_name, data in config.items():
-
-    pubspec["dependency_overrides"][folder_name] = {}
-    pubspec["dependency_overrides"][folder_name]["path"] = f"./dependencies/{folder_name}"
-    
-    integrate_package(folder_name, data)
-    if "dependencies" in data:
-        for folder_name, data in data["dependencies"].items():
-            integrate_package(folder_name, data)
-            pubspec["dependency_overrides"][folder_name] = {}
-            pubspec["dependency_overrides"][folder_name]["path"] = f"./dependencies/{folder_name}"
+# Determine which repositories to integrate
+repos_to_update = [args.repo_name] if args.repo_name else config.keys()
 
+for folder_name in repos_to_update:
+    if folder_name in config:
+        data = config[folder_name]
+        pubspec["dependency_overrides"][folder_name] = {}
+        pubspec["dependency_overrides"][folder_name]["path"] = f"./dependencies/{folder_name}"
+        
+        integrate_package(folder_name, data)
+        
+        if "dependencies" in data:
+            for dep_name, dep_data in data["dependencies"].items():
+                integrate_package(dep_name, dep_data)
+                pubspec["dependency_overrides"][dep_name] = {}
+                pubspec["dependency_overrides"][dep_name]["path"] = f"./dependencies/{dep_name}"
 
 with open(LOCK_FILE_NAME, "w") as f:
     yaml.safe_dump(config_lock, f, sort_keys=True) 
 
 with open("pubspec.yaml", "w") as f:
-    yaml.safe_dump(pubspec, f, sort_keys=True) 
\ No newline at end of file
+    yaml.safe_dump(pubspec, f, sort_keys=True)