Method userDataDecoder

src/quicktimevideo.cpp:850–917

}  // QuickTimeVideo::CameraTagsDecoder

void QuickTimeVideo::userDataDecoder(size_t size_external, size_t recursion_depth) {
  enforce(recursion_depth < max_recursion_depth_, Exiv2::ErrorCode::kerCorruptedMetadata);
  size_t cur_pos = io_->tell();
  const TagVocabulary* td;
  const TagVocabulary* tv;
  const TagVocabulary* tv_internal;

  const long bufMinSize = 100;
  DataBuf buf(bufMinSize);
  size_t size_internal = size_external;
  std::memset(buf.data(), 0x0, buf.size());

  while ((size_internal / 4 != 0) && (size_internal > 0)) {
    buf.data()[4] = '\0';
    io_->readOrThrow(buf.data(), 4);
    const size_t size = buf.read_uint32(0, bigEndian);
    if (size > size_internal)
      break;
    size_internal -= size;
    io_->readOrThrow(buf.data(), 4);

    if (buf.data()[0] == 169)
      buf.data()[0] = ' ';
    td = Exiv2::find(userDatatags, Exiv2::toString(buf.data()));

    tv = Exiv2::find(userDataReferencetags, Exiv2::toString(buf.data()));

    if (size <= 12)
      break;

    if (equalsQTimeTag(buf, "DcMD") || equalsQTimeTag(buf, "NCDT"))
      userDataDecoder(size - 8, recursion_depth + 1);

    else if (equalsQTimeTag(buf, "NCTG"))
      NikonTagsDecoder(size - 8);

    else if (equalsQTimeTag(buf, "TAGS"))
      CameraTagsDecoder(size - 8);

    else if (equalsQTimeTag(buf, "CNCV") || equalsQTimeTag(buf, "CNFV") || equalsQTimeTag(buf, "CNMN") ||
             equalsQTimeTag(buf, "NCHD") || equalsQTimeTag(buf, "FFMV")) {
      enforce(tv, Exiv2::ErrorCode::kerCorruptedMetadata);
      xmpData_[exvGettext(tv->label_)] = readString(*io_, size - 8);
    }

    else if (equalsQTimeTag(buf, "CMbo") || equalsQTimeTag(buf, "Cmbo")) {
      enforce(tv, Exiv2::ErrorCode::kerCorruptedMetadata);
      io_->readOrThrow(buf.data(), 2);
      buf.data()[2] = '\0';
      tv_internal = Exiv2::find(cameraByteOrderTags, Exiv2::toString(buf.data()));

      if (tv_internal)
        xmpData_[exvGettext(tv->label_)] = exvGettext(tv_internal->label_);
      else
        xmpData_[exvGettext(tv->label_)] = Exiv2::toString(buf.data());
    }

    else if (tv) {