decodeZip static method

Future<LottieComposition?> decodeZip(List<int> bytes, { LottieImageProviderFactory? imageProviderFactory, ArchiveFile? filePicker(List<ArchiveFile>)?, })

Implementation

static Future<LottieComposition?> decodeZip(
  List<int> bytes, {
  LottieImageProviderFactory? imageProviderFactory,
  ArchiveFile? Function(List<ArchiveFile>)? filePicker,
}) async {
  if (bytes[0] == 0x50 && bytes[1] == 0x4B) {
    var archive = ZipDecoder().decodeBytes(bytes);

    ArchiveFile? jsonFile;
    if (filePicker != null) {
      jsonFile = filePicker(archive.files);
    }
    jsonFile ??= archive.files.firstWhereOrNull(
      (e) => e.name.startsWith('animations/') && e.name.endsWith('.json'),
    );
    jsonFile ??= archive.files.firstWhere(
      (e) =>
          e.name.endsWith('.json') && p.basename(e.name) != 'manifest.json',
    );

    var composition = parseJsonBytes(jsonFile.content);

    await loadImages(composition.images.values, (image) async {
      var imagePath = p.posix.join(image.dirName, image.fileName);
      var found = archive.files.firstWhereOrNull(
        (f) =>
            _normalizeArchivePath(f.name) == _normalizeArchivePath(imagePath),
      );

      ImageProvider? provider;
      if (imageProviderFactory != null) {
        provider = imageProviderFactory(image);
      }

      if (provider != null) {
        image.loadedImage = await loadImage(composition, image, provider);
      }

      if (found != null) {
        image.loadedImage ??= await loadImage(
          composition,
          image,
          MemoryImage(found.content),
        );
      }
    });

    var fontFiles = {
      for (var file in archive.files)
        if (_fontExtensions.contains(p.extension(file.name).toLowerCase()))
          p.basenameWithoutExtension(file.name).toLowerCase(): file,
    };
    for (var font in composition.fonts.values) {
      var file =
          fontFiles[font.name.toLowerCase()] ??
          fontFiles[font.family.toLowerCase()];
      if (file != null) {
        composition._fontsToLoad.add(FontToLoad(file.content, font));
      }
    }
    return composition;
  }
  return null;
}