split static method

Implementation

static List<UQrDataBlock> split(Uint8List rawCodewords, UQrVersion version, UQrFormatInformation formatInfo) {
  if (rawCodewords.length != version.totalCodewords) throw const UCodeDecodeException("Codeword length mismatch");
  final UQrEcBlocks ecBlocks = version.ecBlocks[formatInfo.levelIndex];

  final List<UQrDataBlock> result = <UQrDataBlock>[];
  for (final UQrEcb block in ecBlocks.blocks) {
    for (int i = 0; i < block.count; i++) {
      result.add(UQrDataBlock(block.dataCodewords, Uint8List(ecBlocks.ecCodewordsPerBlock + block.dataCodewords)));
    }
  }
  final int numResultBlocks = result.length;

  final int shorterBlocksTotalCodewords = result.first.codewords.length;
  int longerBlocksStartAt = numResultBlocks - 1;
  while (longerBlocksStartAt >= 0) {
    if (result[longerBlocksStartAt].codewords.length == shorterBlocksTotalCodewords) break;
    longerBlocksStartAt--;
  }
  longerBlocksStartAt++;

  final int shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ecCodewordsPerBlock;
  int rawCodewordsOffset = 0;
  for (int i = 0; i < shorterBlocksNumDataCodewords; i++) {
    for (int j = 0; j < numResultBlocks; j++) {
      result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
    }
  }
  for (int j = longerBlocksStartAt; j < numResultBlocks; j++) {
    result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
  }

  final int max = result.first.codewords.length;
  for (int i = shorterBlocksNumDataCodewords; i < max; i++) {
    for (int j = 0; j < numResultBlocks; j++) {
      final int iOffset = j < longerBlocksStartAt ? i : i + 1;
      result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
    }
  }
  return result;
}