decodeBuffer method

Archive decodeBuffer(InputStreamBase input, { bool verify = false, String? password, })

Implementation

Archive decodeBuffer(
  InputStreamBase input, {
  bool verify = false,
  String? password,
}) {
  directory = ZipDirectory.read(input, password: password);
  final archive = Archive();

  for (final zfh in directory.fileHeaders) {
    final zf = zfh.file!;

    // The attributes are stored in base 8
    final mode = zfh.externalFileAttributes!;
    final compress = zf.compressionMethod != ZipFile.zipCompressionStore;

    if (verify) {
      final computedCrc = getCrc32(zf.content);
      if (computedCrc != zf.crc32) {
        throw ArchiveException('Invalid CRC for file in archive.');
      }
    }

    //dynamic content = zf.rawContent;
    final file = ArchiveFile(
        zf.filename, zf.uncompressedSize!, zf, zf.compressionMethod);

    file.mode = mode >> 16;

    // see https://github.com/brendan-duncan/archive/issues/21
    // UNIX systems has a creator version of 3 decimal at 1 byte offset
    if (zfh.versionMadeBy >> 8 == 3) {
      file.isFile = false;

      final fileType = file.mode & 0xF000;
      switch (fileType) {
        case 0x8000:
        case 0x0000: // No determination can be made so we assume it's a file.
          file.isFile = true;
          break;
        case 0xA000:
          file.isSymbolicLink = true;
          file.nameOfLinkedFile = utf8.decode(file.content as List<int>);
          break;
        default:
      }
    } else {
      file.isFile = !file.name.endsWith('/');
    }

    file.crc32 = zf.crc32;
    file.compress = compress;
    file.lastModTime = zf.lastModFileDate << 16 | zf.lastModFileTime;

    archive.addFile(file);
  }

  return archive;
}