DTB-Can't catch an error on the TagProcessor().getTagsFromByteArray

[moda20]

Describe the bug
an error happens when reading tags from byteArray and I can't catch it, it will always crash my code and stop everything I am doing.
The error is when decoding comments, see exact error below

Environment

• Platform Flutter Android
• Library version 0.3.1
• Tag type I don't know, can't get there

To Reproduce
Steps to reproduce the behavior:

1. Nothing, I just passed bytes from a file ( an existing file )
2. See error

Expected behavior
The error might happen, but I need to be able to catch it.

Additional context

[ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: RangeError (end): Invalid value: Not in inclusive range 3..20: 0
E/flutter (26269): #0      RangeError.checkValidRange (dart:core/errors.dart:357:9)
E/flutter (26269): #1      _TypedIntListMixin.sublist (dart:typed_data-patch/typed_data_patch.dart:462:31)
E/flutter (26269): #2      COMMFrame.decodeBody (package:dart_tags/src/frames/id3v2/comm_frame.dart:35:47)
E/flutter (26269): #3      ID3V2Frame.decode (package:dart_tags/src/frames/id3v2/id3v2_frame.dart:57:39)
E/flutter (26269): #4      ID3V2Reader.parseValues (package:dart_tags/src/readers/id3v2.dart:71:23)
E/flutter (26269): #5      Reader.read.<anonymous closure> (package:dart_tags/src/readers/reader.dart:13:23)
E/flutter (26269): #6      _rootRunUnary (dart:async/zone.dart:1198:47)
E/flutter (26269): #7      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (26269): #8      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
E/flutter (26269): #9      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
E/flutter (26269): #10     Future._propagateToListeners (dart:async/future_impl.dart:725:32)
E/flutter (26269): #11     Future._addListener.<anonymous closure> (dart:async/future_impl.dart:393:9)
E/flutter (26269): #12     _rootRun (dart:async/zone.dart:1190:13)
E/flutter (26269): #13     _CustomZone.run (dart:async/zone.dart:1093:19)
E/flutter (26269): #14     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
E/flutter (26269): #15     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
E/flutter (26269): #16     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (26269): #17     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
E/flutter (26269): 

[NiKoTron]

Thanx for the report I'll investigate it. and add the possibility to catch errors.

[plyoung]

I've just encountered something similar, where I can not handle the error in my code, with a NoSuchMethodError exception in id3v2.dart.

frame, in the code below could be null it seems.

final frame = ff.getFrame(fr);
final m = frame.decode(fr);

#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1      ID3V2Reader.parseValues
package:dart_tags/…/readers/id3v2.dart:71
#2      Reader.read.<anonymous closure>
package:dart_tags/…/readers/reader.dart:13
#3      _rootRunUnary (dart:async/zone.dart:1194:47)
#4      _CustomZone.runUnary (dart:async/zone.dart:1097:19)
#5      _FutureListener.handleValue (dart:async/future_impl.dart:150:18)
#6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:703:45)
#7      Future._propagateToListeners (dart:async/future_impl.dart:732:32)
#8      Future._addListener.<anonymous closure> (dart:async/future_impl.dart:400:9)
#9      _rootRun (dart:async/zone.dart:1186:13)
#10     _CustomZone.run (dart:async/zone.dart:1090:19)
#11     _CustomZone.runGuarded (dart:async/zone.dart:994:7)
#12     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1034:23)
#13     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#14     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)

[plyoung]

Another problem I found is that tags might be broken. In the one case the tag name was the actual description and that caused an error too. I wrapped that block at line 71 in a try/catch and it seems to now get through without problems.

      final frame = ff.getFrame(fr);
      final m = frame?.decode(fr);

      try {
        if (m?.key != null && m?.value != null) {
          if (m?.value is KeyEntity) {
            if (tags[m.key] == null) {
              tags[m.key] = {m.value.key: m.value};
            } else {
              tags[m.key][m.value.key] = m.value;
            }
          } else {
            tags[m.key] = m.value;
          }
        }
      } catch (ex) {}

[moritz-weber]

I encounter the same error as moda20 in a specific scenario in src/frames/id3v2/comm_frame.dart decodeBody:

• enc is not UTF16
• first 4 bytes of the frame are 0x00
• therefore splitIndex is 0
  => sublist(3, splitIndex) crashes

My guess is that data.indexOf(0x00) would need the start parameter set to 3.
Is there any chance that this will be fixed? I could send you the mp3 file for debugging.

[luccasmaso]

Same here as all of you. Also cannot catch any exceptions