Method decodeBlock

src/quicktimevideo.cpp:581–623

}  // QuickTimeVideo::readMetadata

void QuickTimeVideo::decodeBlock(size_t recursion_depth, std::string const& entered_from) {
  enforce(recursion_depth < max_recursion_depth_, Exiv2::ErrorCode::kerCorruptedMetadata);

  const long bufMinSize = 4;
  DataBuf buf(bufMinSize + 1);
  uint64_t size = 0;
  buf.data()[4] = '\0';

  io_->read(buf.data(), 4);
  if (io_->eof()) {
    continueTraversing_ = false;
    return;
  }

  size = buf.read_uint32(0, bigEndian);

  io_->readOrThrow(buf.data(), 4);

  // we have read 2x 4 bytes
  size_t hdrsize = 8;

  if (size == 1) {
    // The box size is encoded as a uint64_t, so we need to read another 8 bytes.
    DataBuf data(8);
    hdrsize += 8;
    io_->readOrThrow(data.data(), data.size());
    size = data.read_uint64(0, bigEndian);
  } else if (size == 0 && entered_from == "meta") {
    size = buf.read_uint32(0, bigEndian);
    io_->readOrThrow(buf.data(), 4, Exiv2::ErrorCode::kerCorruptedMetadata);
  }

  enforce(size >= hdrsize, Exiv2::ErrorCode::kerCorruptedMetadata);
  enforce(size - hdrsize <= io_->size() - io_->tell(), Exiv2::ErrorCode::kerCorruptedMetadata);
  enforce(size - hdrsize <= std::numeric_limits<size_t>::max(), Exiv2::ErrorCode::kerCorruptedMetadata);

  // std::cerr<<"Tag=>"<<buf.data()<<"     size=>"<<size-hdrsize << std::endl;
  const auto newsize = static_cast<size_t>(size - hdrsize);
  if (newsize > buf.size()) {
    buf.resize(newsize);
  }
  tagDecoder(buf, newsize, recursion_depth + 1);
}  // QuickTimeVideo::decodeBlock

static std::string readString(BasicIo& io, size_t size) {
  enforce(size <= io.size() - io.tell(), Exiv2::ErrorCode::kerCorruptedMetadata);