readByteConstBlock static method

ByteConstBlock readByteConstBlock(Uint8List program, int pc)

Implementation

static ByteConstBlock readByteConstBlock(Uint8List program, int pc) {
  final results = <Uint8List>[];
  var size = 1;
  var result = getUVarint(program, pc + size);
  if (result.length <= 0) {
    throw AlgorandException(
      message: 'could not decode byte[] const block at pc=$pc',
    );
  }

  size += result.length;
  var numInts = result.value;
  for (var i = 0; i < numInts; i++) {
    if (pc + size >= program.length) {
      throw AlgorandException(
        message: 'byte[] const block exceeds program length',
      );
    }
    result = getUVarint(program, pc + size);
    if (result.length <= 0) {
      throw AlgorandException(
        message: 'could not decode int const[$i] block at pc=${pc + size}',
      );
    }
    size += result.length;
    if (pc + size + result.value > program.length) {
      throw AlgorandException(
        message: '"byte[] const block exceeds program length',
      );
    }

    final buffer = List.filled(result.value, 0);
    buffer.setRange(0, result.value, program, pc + size);
    results.add(Uint8List.fromList(buffer));
    size += result.value;
  }

  return ByteConstBlock(size, results);
}