DataBuf IptcParser::encode(const IptcData& iptcData)
{
DataBuf buf(iptcData.size());
byte *pWrite = buf.pData_;
IptcData::const_iterator iter = iptcData.begin();
IptcData::const_iterator end = iptcData.end();
for ( ; iter != end; ++iter) {
// marker, record Id, dataset num
*pWrite++ = marker_;
*pWrite++ = static_cast<byte>(iter->record());
*pWrite++ = static_cast<byte>(iter->tag());
// extended or standard dataset?
long dataSize = iter->size();
if (dataSize > 32767) {
// always use 4 bytes for extended length
uint16_t sizeOfSize = 4 | 0x8000;
us2Data(pWrite, sizeOfSize, bigEndian);
pWrite += 2;
ul2Data(pWrite, dataSize, bigEndian);
pWrite += 4;
}
else {
us2Data(pWrite, static_cast<uint16_t>(dataSize), bigEndian);
pWrite += 2;
}
pWrite += iter->value().copy(pWrite, bigEndian);
}
return buf;
} // IptcParser::encode
DataBuf IptcParser::encode(const IptcData& iptcData)
{
DataBuf buf(iptcData.size());
byte *pWrite = buf.pData_;
// Copy the iptc data sets and sort them by record but preserve the order of datasets
IptcMetadata sortedIptcData;
std::copy(iptcData.begin(), iptcData.end(), std::back_inserter(sortedIptcData));
std::stable_sort(sortedIptcData.begin(), sortedIptcData.end(), cmpIptcdataByRecord);
IptcData::const_iterator iter = sortedIptcData.begin();
IptcData::const_iterator end = sortedIptcData.end();
for ( ; iter != end; ++iter) {
// marker, record Id, dataset num
*pWrite++ = marker_;
*pWrite++ = static_cast<byte>(iter->record());
*pWrite++ = static_cast<byte>(iter->tag());
// extended or standard dataset?
long dataSize = iter->size();
if (dataSize > 32767) {
// always use 4 bytes for extended length
uint16_t sizeOfSize = 4 | 0x8000;
us2Data(pWrite, sizeOfSize, bigEndian);
pWrite += 2;
ul2Data(pWrite, dataSize, bigEndian);
pWrite += 4;
}
else {
us2Data(pWrite, static_cast<uint16_t>(dataSize), bigEndian);
pWrite += 2;
}
pWrite += iter->value().copy(pWrite, bigEndian);
}
return buf;
} // IptcParser::encode