void JpegBase::doWriteMetadata(BasicIo& outIo)
{
if (!io_->isopen()) throw Error(20);
if (!outIo.isopen()) throw Error(21);
// Ensure that this is the correct image type
if (!isThisType(*io_, true)) {
if (io_->error() || io_->eof()) throw Error(20);
throw Error(22);
}
const long bufMinSize = 36;
long bufRead = 0;
DataBuf buf(bufMinSize);
const long seek = io_->tell();
int count = 0;
int search = 0;
int insertPos = 0;
int comPos = 0;
int skipApp1Exif = -1;
int skipApp1Xmp = -1;
int skipApp13Ps3 = -1;
int skipCom = -1;
DataBuf psData;
DataBuf rawExif;
// Write image header
if (writeHeader(outIo)) throw Error(21);
// Read section marker
int marker = advanceToMarker();
if (marker < 0) throw Error(22);
// First find segments of interest. Normally app0 is first and we want
// to insert after it. But if app0 comes after com, app1 and app13 then
// don't bother.
while (marker != sos_ && marker != eoi_ && search < 5) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(20);
uint16_t size = getUShort(buf.pData_, bigEndian);
if (marker == app0_) {
if (size < 2) throw Error(22);
insertPos = count + 1;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if ( skipApp1Exif == -1
&& marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
if (size < 8) throw Error(22);
skipApp1Exif = count;
++search;
// Seek to beginning and read the current Exif data
io_->seek(8 - bufRead, BasicIo::cur);
rawExif.alloc(size - 8);
io_->read(rawExif.pData_, rawExif.size_);
if (io_->error() || io_->eof()) throw Error(22);
}
else if (marker == app1_ && memcmp(buf.pData_ + 2, xmpId_, 29) == 0) {
if (size < 31) throw Error(22);
skipApp1Xmp = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if (marker == app13_ && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
#ifdef DEBUG
std::cerr << "Found APP13 Photoshop PS3 segment\n";
#endif
if (size < 16) throw Error(22);
skipApp13Ps3 = count;
++search;
io_->seek(16 - bufRead, BasicIo::cur);
psData.alloc(size - 16);
// Load PS data now to allow reinsertion at any point
io_->read(psData.pData_, size - 16);
if (io_->error() || io_->eof()) throw Error(20);
}
else if (marker == com_ && skipCom == -1) {
if (size < 2) throw Error(22);
// Jpegs can have multiple comments, but for now only handle
// the first one (most jpegs only have one anyway).
skipCom = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else {
if (size < 2) throw Error(22);
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
// As in jpeg-6b/wrjpgcom.c:
// We will insert the new comment marker just before SOFn.
// This (a) causes the new comment to appear after, rather than before,
// existing comments; and (b) ensures that comments come after any JFIF
// or JFXX markers, as required by the JFIF specification.
if ( comPos == 0
&& ( marker == sof0_
|| marker == sof1_
|| marker == sof2_
|| marker == sof3_
|| marker == sof5_
|| marker == sof6_
|| marker == sof7_
|| marker == sof9_
|| marker == sof10_
|| marker == sof11_
|| marker == sof13_
|| marker == sof14_
|| marker == sof15_)) {
comPos = count;
++search;
}
marker = advanceToMarker();
if (marker < 0) throw Error(22);
++count;
}
if (comPos == 0) {
if (marker == eoi_) comPos = count;
else comPos = insertPos;
++search;
}
if (exifData_.count() > 0) ++search;
if (writeXmpFromPacket() == false && xmpData_.count() > 0) ++search;
if (writeXmpFromPacket() == true && xmpPacket_.size() > 0) ++search;
if (iptcData_.count() > 0) ++search;
if (!comment_.empty()) ++search;
io_->seek(seek, BasicIo::beg);
count = 0;
marker = advanceToMarker();
if (marker < 0) throw Error(22);
// To simplify this a bit, new segments are inserts at either the start
// or right after app0. This is standard in most jpegs, but has the
// potential to change segment ordering (which is allowed).
// Segments are erased if there is no assigned metadata.
while (marker != sos_ && search > 0) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(20);
// Careful, this can be a meaningless number for empty
// images with only an eoi_ marker
uint16_t size = getUShort(buf.pData_, bigEndian);
if (insertPos == count) {
byte tmpBuf[64];
// Write Exif data first so that - if there is no app0 - we
// create "Exif images" according to the Exif standard.
if (exifData_.count() > 0) {
Blob blob;
ByteOrder bo = byteOrder();
if (bo == invalidByteOrder) {
bo = littleEndian;
setByteOrder(bo);
}
WriteMethod wm = ExifParser::encode(blob,
rawExif.pData_,
rawExif.size_,
bo,
exifData_);
const byte* pExifData = rawExif.pData_;
uint32_t exifSize = rawExif.size_;
if (wm == wmIntrusive) {
pExifData = blob.size() > 0 ? &blob[0] : 0;
exifSize = static_cast<uint32_t>(blob.size());
}
if (exifSize > 0) {
// Write APP1 marker, size of APP1 field, Exif id and Exif data
tmpBuf[0] = 0xff;
tmpBuf[1] = app1_;
if (exifSize + 8 > 0xffff) throw Error(37, "Exif");
us2Data(tmpBuf + 2, static_cast<uint16_t>(exifSize + 8), bigEndian);
std::memcpy(tmpBuf + 4, exifId_, 6);
if (outIo.write(tmpBuf, 10) != 10) throw Error(21);
// Write new Exif data buffer
if ( outIo.write(pExifData, exifSize)
!= static_cast<long>(exifSize)) throw Error(21);
if (outIo.error()) throw Error(21);
--search;
}
}
if (writeXmpFromPacket() == false) {
if (XmpParser::encode(xmpPacket_, xmpData_) > 1) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Error: Failed to encode XMP metadata.\n";
#endif
}
}
if (xmpPacket_.size() > 0) {
// Write APP1 marker, size of APP1 field, XMP id and XMP packet
tmpBuf[0] = 0xff;
tmpBuf[1] = app1_;
if (xmpPacket_.size() + 31 > 0xffff) throw Error(37, "XMP");
us2Data(tmpBuf + 2, static_cast<uint16_t>(xmpPacket_.size() + 31), bigEndian);
std::memcpy(tmpBuf + 4, xmpId_, 29);
if (outIo.write(tmpBuf, 33) != 33) throw Error(21);
// Write new XMP packet
if ( outIo.write(reinterpret_cast<const byte*>(xmpPacket_.data()), static_cast<long>(xmpPacket_.size()))
!= static_cast<long>(xmpPacket_.size())) throw Error(21);
if (outIo.error()) throw Error(21);
--search;
}
if (psData.size_ > 0 || iptcData_.count() > 0) {
// Set the new IPTC IRB, keeps existing IRBs but removes the
// IPTC block if there is no new IPTC data to write
DataBuf newPsData = Photoshop::setIptcIrb(psData.pData_,
psData.size_,
iptcData_);
if (newPsData.size_ > 0) {
// Write APP13 marker, new size, and ps3Id
tmpBuf[0] = 0xff;
tmpBuf[1] = app13_;
if (newPsData.size_ + 16 > 0xffff) throw Error(37, "IPTC");
us2Data(tmpBuf + 2, static_cast<uint16_t>(newPsData.size_ + 16), bigEndian);
std::memcpy(tmpBuf + 4, Photoshop::ps3Id_, 14);
if (outIo.write(tmpBuf, 18) != 18) throw Error(21);
if (outIo.error()) throw Error(21);
// Write new Photoshop IRB data buffer
if ( outIo.write(newPsData.pData_, newPsData.size_)
!= newPsData.size_) throw Error(21);
if (outIo.error()) throw Error(21);
}
if (iptcData_.count() > 0) {
--search;
}
}
}
if (comPos == count) {
if (!comment_.empty()) {
byte tmpBuf[4];
// Write COM marker, size of comment, and string
tmpBuf[0] = 0xff;
tmpBuf[1] = com_;
if (comment_.length() + 3 > 0xffff) throw Error(37, "JPEG comment");
us2Data(tmpBuf + 2, static_cast<uint16_t>(comment_.length() + 3), bigEndian);
if (outIo.write(tmpBuf, 4) != 4) throw Error(21);
if (outIo.write((byte*)comment_.data(), (long)comment_.length())
!= (long)comment_.length()) throw Error(21);
if (outIo.putb(0)==EOF) throw Error(21);
if (outIo.error()) throw Error(21);
--search;
}
--search;
}
if (marker == eoi_) {
break;
}
else if ( skipApp1Exif == count
|| skipApp1Xmp == count
|| skipApp13Ps3 == count
|| skipCom == count) {
--search;
io_->seek(size-bufRead, BasicIo::cur);
}
else {
if (size < 2) throw Error(22);
buf.alloc(size+2);
io_->seek(-bufRead-2, BasicIo::cur);
io_->read(buf.pData_, size+2);
if (io_->error() || io_->eof()) throw Error(20);
if (outIo.write(buf.pData_, size+2) != size+2) throw Error(21);
if (outIo.error()) throw Error(21);
}
// Next marker
marker = advanceToMarker();
if (marker < 0) throw Error(22);
++count;
}
// Copy rest of the Io
io_->seek(-2, BasicIo::cur);
buf.alloc(4096);
long readSize = 0;
while ((readSize=io_->read(buf.pData_, buf.size_))) {
if (outIo.write(buf.pData_, readSize) != readSize) throw Error(21);
}
if (outIo.error()) throw Error(21);
} // JpegBase::doWriteMetadata
void JpegBase::doWriteMetadata(BasicIo& outIo)
{
if (!io_->isopen()) throw Error(20);
if (!outIo.isopen()) throw Error(21);
// Ensure that this is the correct image type
if (!isThisType(*io_, true)) {
if (io_->error() || io_->eof()) throw Error(20);
throw Error(22);
}
const long bufMinSize = 16;
long bufRead = 0;
DataBuf buf(bufMinSize);
const long seek = io_->tell();
int count = 0;
int search = 0;
int insertPos = 0;
int skipApp1Exif = -1;
int skipApp13Ps3 = -1;
int skipCom = -1;
DataBuf psData;
// Write image header
if (writeHeader(outIo)) throw Error(21);
// Read section marker
int marker = advanceToMarker();
if (marker < 0) throw Error(22);
// First find segments of interest. Normally app0 is first and we want
// to insert after it. But if app0 comes after com, app1 and app13 then
// don't bother.
while (marker != sos_ && marker != eoi_ && search < 3) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(20);
uint16_t size = getUShort(buf.pData_, bigEndian);
if (marker == app0_) {
if (size < 2) throw Error(22);
insertPos = count + 1;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if (marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
if (size < 8) throw Error(22);
skipApp1Exif = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else if (marker == app13_ && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
if (size < 16) throw Error(22);
skipApp13Ps3 = count;
++search;
// needed if bufMinSize!=16: io_->seek(16-bufRead, BasicIo::cur);
psData.alloc(size - 16);
// Load PS data now to allow reinsertion at any point
io_->read(psData.pData_, psData.size_);
if (io_->error() || io_->eof()) throw Error(20);
}
else if (marker == com_ && skipCom == -1) {
if (size < 2) throw Error(22);
// Jpegs can have multiple comments, but for now only handle
// the first one (most jpegs only have one anyway).
skipCom = count;
++search;
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
else {
if (size < 2) throw Error(22);
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
}
marker = advanceToMarker();
if (marker < 0) throw Error(22);
++count;
}
if (exifData_.count() > 0) ++search;
if (iptcData_.count() > 0) ++search;
if (!comment_.empty()) ++search;
io_->seek(seek, BasicIo::beg);
count = 0;
marker = advanceToMarker();
if (marker < 0) throw Error(22);
// To simplify this a bit, new segments are inserts at either the start
// or right after app0. This is standard in most jpegs, but has the
// potential to change segment ordering (which is allowed).
// Segments are erased if there is no assigned metadata.
while (marker != sos_ && search > 0) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(20);
// Careful, this can be a meaningless number for empty
// images with only an eoi_ marker
uint16_t size = getUShort(buf.pData_, bigEndian);
if (insertPos == count) {
byte tmpBuf[18];
if (!comment_.empty()) {
// Write COM marker, size of comment, and string
tmpBuf[0] = 0xff;
tmpBuf[1] = com_;
if (comment_.length() + 3 > 0xffff) throw Error(37, "JPEG comment");
us2Data(tmpBuf + 2, static_cast<uint16_t>(comment_.length() + 3), bigEndian);
if (outIo.write(tmpBuf, 4) != 4) throw Error(21);
if (outIo.write((byte*)comment_.data(), (long)comment_.length())
!= (long)comment_.length()) throw Error(21);
if (outIo.putb(0)==EOF) throw Error(21);
if (outIo.error()) throw Error(21);
--search;
}
if (exifData_.count() > 0) {
DataBuf rawExif = exifData_.copy();
if (rawExif.size_ > 0) {
// Write APP1 marker, size of APP1 field, Exif id and Exif data
tmpBuf[0] = 0xff;
tmpBuf[1] = app1_;
if (rawExif.size_ + 8 > 0xffff) throw Error(37, "Exif");
us2Data(tmpBuf + 2, static_cast<uint16_t>(rawExif.size_ + 8), bigEndian);
memcpy(tmpBuf + 4, exifId_, 6);
if (outIo.write(tmpBuf, 10) != 10) throw Error(21);
// Write new Exif data buffer
if ( outIo.write(rawExif.pData_, rawExif.size_)
!= rawExif.size_) throw Error(21);
if (outIo.error()) throw Error(21);
--search;
}
}
if (psData.size_ > 0 || iptcData_.count() > 0) {
// Set the new IPTC IRB, keeps existing IRBs but removes the
// IPTC block if there is no new IPTC data to write
DataBuf newPsData = Photoshop::setIptcIrb(psData.pData_,
psData.size_,
iptcData_);
if (newPsData.size_ > 0) {
// Write APP13 marker, new size, and ps3Id
tmpBuf[0] = 0xff;
tmpBuf[1] = app13_;
if (newPsData.size_ + 16 > 0xffff) throw Error(37, "IPTC");
us2Data(tmpBuf + 2, static_cast<uint16_t>(newPsData.size_ + 16), bigEndian);
memcpy(tmpBuf + 4, Photoshop::ps3Id_, 14);
if (outIo.write(tmpBuf, 18) != 18) throw Error(21);
if (outIo.error()) throw Error(21);
// Write new Photoshop IRB data buffer
if ( outIo.write(newPsData.pData_, newPsData.size_)
!= newPsData.size_) throw Error(21);
if (outIo.error()) throw Error(21);
}
if (iptcData_.count() > 0) {
--search;
}
}
}
if (marker == eoi_) {
break;
}
else if (skipApp1Exif==count || skipApp13Ps3==count || skipCom==count) {
--search;
io_->seek(size-bufRead, BasicIo::cur);
}
else {
if (size < 2) throw Error(22);
buf.alloc(size+2);
io_->seek(-bufRead-2, BasicIo::cur);
io_->read(buf.pData_, size+2);
if (io_->error() || io_->eof()) throw Error(20);
if (outIo.write(buf.pData_, size+2) != size+2) throw Error(21);
if (outIo.error()) throw Error(21);
}
// Next marker
marker = advanceToMarker();
if (marker < 0) throw Error(22);
++count;
}
// Copy rest of the Io
io_->seek(-2, BasicIo::cur);
buf.alloc(4096);
long readSize = 0;
while ((readSize=io_->read(buf.pData_, buf.size_))) {
if (outIo.write(buf.pData_, readSize) != readSize) throw Error(21);
}
if (outIo.error()) throw Error(21);
} // JpegBase::doWriteMetadata
void JpegBase::readMetadata()
{
int rc = 0; // Todo: this should be the return value
if (io_->open() != 0) throw Error(9, io_->path(), strError());
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (!isThisType(*io_, true)) {
if (io_->error() || io_->eof()) throw Error(14);
throw Error(15);
}
clearMetadata();
int search = 5;
const long bufMinSize = 36;
long bufRead = 0;
DataBuf buf(bufMinSize);
Blob iptcBlob;
bool foundPsData = false;
bool foundExifData = false;
// Read section marker
int marker = advanceToMarker();
if (marker < 0) throw Error(15);
while (marker != sos_ && marker != eoi_ && search > 0) {
// Read size and signature (ok if this hits EOF)
std::memset(buf.pData_, 0x0, buf.size_);
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(14);
if (bufRead < 2) throw Error(15);
uint16_t size = getUShort(buf.pData_, bigEndian);
if (foundPsData && marker != app13_) {
// For IPTC, decrement search only after all app13 segments are
// loaded, assuming they all appear in sequence. But decode IPTC
// data after the loop, in case an app13 is the last segment
// before sos or eoi.
foundPsData = false;
if (--search == 0) break;
}
if ( !foundExifData
&& marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
if (size < 8) {
rc = 1;
break;
}
// Seek to beginning and read the Exif data
io_->seek(8 - bufRead, BasicIo::cur);
DataBuf rawExif(size - 8);
io_->read(rawExif.pData_, rawExif.size_);
if (io_->error() || io_->eof()) throw Error(14);
ByteOrder bo = ExifParser::decode(exifData_, rawExif.pData_, rawExif.size_);
setByteOrder(bo);
if (rawExif.size_ > 0 && byteOrder() == invalidByteOrder) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: Failed to decode Exif metadata.\n";
#endif
exifData_.clear();
}
--search;
foundExifData = true;
}
else if (marker == app1_ && memcmp(buf.pData_ + 2, xmpId_, 29) == 0) {
if (size < 31) {
rc = 6;
break;
}
// Seek to beginning and read the XMP packet
io_->seek(31 - bufRead, BasicIo::cur);
DataBuf xmpPacket(size - 31);
io_->read(xmpPacket.pData_, xmpPacket.size_);
if (io_->error() || io_->eof()) throw Error(14);
xmpPacket_.assign(reinterpret_cast<char*>(xmpPacket.pData_), xmpPacket.size_);
if (xmpPacket_.size() > 0 && XmpParser::decode(xmpData_, xmpPacket_)) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: Failed to decode XMP metadata.\n";
#endif
}
--search;
}
else if ( marker == app13_
&& memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
if (size < 16) {
rc = 2;
break;
}
// Read the rest of the APP13 segment
io_->seek(16 - bufRead, BasicIo::cur);
DataBuf psData(size - 16);
io_->read(psData.pData_, psData.size_);
if (io_->error() || io_->eof()) throw Error(14);
const byte *record = 0;
uint32_t sizeIptc = 0;
uint32_t sizeHdr = 0;
#ifdef DEBUG
std::cerr << "Found app13 segment, size = " << size << "\n";
//hexdump(std::cerr, psData.pData_, psData.size_);
#endif
// Find actual IPTC data within the APP13 segment
const byte* pEnd = psData.pData_ + psData.size_;
const byte* pCur = psData.pData_;
while ( pCur < pEnd
&& 0 == Photoshop::locateIptcIrb(pCur,
static_cast<long>(pEnd - pCur),
&record,
&sizeHdr,
&sizeIptc)) {
if (sizeIptc) {
#ifdef DEBUG
std::cerr << "Found IPTC IRB, size = " << sizeIptc << "\n";
#endif
append(iptcBlob, record + sizeHdr, sizeIptc);
}
pCur = record + sizeHdr + sizeIptc;
pCur += (sizeIptc & 1);
}
foundPsData = true;
}
else if (marker == com_ && comment_.empty())
{
if (size < 2) {
rc = 3;
break;
}
// JPEGs can have multiple comments, but for now only read
// the first one (most jpegs only have one anyway). Comments
// are simple single byte ISO-8859-1 strings.
io_->seek(2 - bufRead, BasicIo::cur);
DataBuf comment(size - 2);
io_->read(comment.pData_, comment.size_);
if (io_->error() || io_->eof()) throw Error(14);
comment_.assign(reinterpret_cast<char*>(comment.pData_), comment.size_);
while ( comment_.length()
&& comment_.at(comment_.length()-1) == '\0') {
comment_.erase(comment_.length()-1);
}
--search;
}
else if ( pixelHeight_ == 0
&& ( marker == sof0_ || marker == sof1_ || marker == sof2_
|| marker == sof3_ || marker == sof5_ || marker == sof6_
|| marker == sof7_ || marker == sof9_ || marker == sof10_
|| marker == sof11_ || marker == sof13_ || marker == sof14_
|| marker == sof15_)) {
// We hit a SOFn (start-of-frame) marker
if (size < 8) {
rc = 7;
break;
}
pixelHeight_ = getUShort(buf.pData_ + 3, bigEndian);
pixelWidth_ = getUShort(buf.pData_ + 5, bigEndian);
if (pixelHeight_ != 0) --search;
// Skip the remainder of the segment
io_->seek(size-bufRead, BasicIo::cur);
}
else {
if (size < 2) {
rc = 4;
break;
}
// Skip the remainder of the unknown segment
if (io_->seek(size - bufRead, BasicIo::cur)) throw Error(14);
}
// Read the beginning of the next segment
marker = advanceToMarker();
if (marker < 0) {
rc = 5;
break;
}
} // while there are segments to process
if ( iptcBlob.size() > 0
&& IptcParser::decode(iptcData_,
&iptcBlob[0],
static_cast<uint32_t>(iptcBlob.size()))) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: Failed to decode IPTC metadata.\n";
#endif
iptcData_.clear();
}
if (rc != 0) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: JPEG format error, rc = " << rc << "\n";
#endif
}
} // JpegBase::readMetadata
void JpegBase::readMetadata()
{
int rc = 0; // Todo: this should be the return value
if (io_->open() != 0) throw Error(9, io_->path(), strError());
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (!isThisType(*io_, true)) {
if (io_->error() || io_->eof()) throw Error(14);
throw Error(15);
}
clearMetadata();
int search = 3;
const long bufMinSize = 16;
long bufRead = 0;
DataBuf buf(bufMinSize);
// Read section marker
int marker = advanceToMarker();
if (marker < 0) throw Error(15);
while (marker != sos_ && marker != eoi_ && search > 0) {
// Read size and signature (ok if this hits EOF)
bufRead = io_->read(buf.pData_, bufMinSize);
if (io_->error()) throw Error(14);
uint16_t size = getUShort(buf.pData_, bigEndian);
if (marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
if (size < 8) {
rc = 1;
break;
}
// Seek to beginning and read the Exif data
io_->seek(8-bufRead, BasicIo::cur);
long sizeExifData = size - 8;
DataBuf rawExif(sizeExifData);
io_->read(rawExif.pData_, sizeExifData);
if (io_->error() || io_->eof()) throw Error(14);
if (exifData_.load(rawExif.pData_, sizeExifData)) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: Failed to decode Exif metadata.\n";
#endif
exifData_.clear();
}
--search;
}
else if ( marker == app13_
&& memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
if (size < 16) {
rc = 2;
break;
}
// Read the rest of the APP13 segment
// needed if bufMinSize!=16: io_->seek(16-bufRead, BasicIo::cur);
DataBuf psData(size - 16);
io_->read(psData.pData_, psData.size_);
if (io_->error() || io_->eof()) throw Error(14);
const byte *record = 0;
uint32_t sizeIptc = 0;
uint32_t sizeHdr = 0;
// Find actual Iptc data within the APP13 segment
if (!Photoshop::locateIptcIrb(psData.pData_, psData.size_,
&record, &sizeHdr, &sizeIptc)) {
if (sizeIptc) {
if (iptcData_.load(record + sizeHdr, sizeIptc)) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: Failed to decode IPTC metadata.\n";
#endif
iptcData_.clear();
}
}
}
--search;
}
else if (marker == com_ && comment_.empty())
{
if (size < 2) {
rc = 3;
break;
}
// Jpegs can have multiple comments, but for now only read
// the first one (most jpegs only have one anyway). Comments
// are simple single byte ISO-8859-1 strings.
io_->seek(2-bufRead, BasicIo::cur);
buf.alloc(size-2);
io_->read(buf.pData_, size-2);
if (io_->error() || io_->eof()) throw Error(14);
comment_.assign(reinterpret_cast<char*>(buf.pData_), size-2);
while ( comment_.length()
&& comment_.at(comment_.length()-1) == '\0') {
comment_.erase(comment_.length()-1);
}
--search;
}
else {
if (size < 2) {
rc = 4;
break;
}
// Skip the remainder of the unknown segment
if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(14);
}
// Read the beginning of the next segment
marker = advanceToMarker();
if (marker < 0) {
rc = 5;
break;
}
} // while there are segments to process
if (rc != 0) {
#ifndef SUPPRESS_WARNINGS
std::cerr << "Warning: JPEG format error, rc = " << rc << "\n";
#endif
}
} // JpegBase::readMetadata
