Prefer writing PNG eXIf chunk
This commit is contained in:
Miloš Komarčević
parent
13ecfbc233
commit
b52ade814b
@ -321,14 +321,12 @@ std::string PngChunk::makeMetadataChunk(const std::string& metadata, MetadataId
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switch (type) {
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case mdComment:
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return makeUtf8TxtChunk("Description", metadata, true);
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case mdExif:
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rawProfile = writeRawProfile(metadata, "exif");
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return makeAsciiTxtChunk("Raw profile type exif", rawProfile, true);
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case mdIptc:
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rawProfile = writeRawProfile(metadata, "iptc");
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return makeAsciiTxtChunk("Raw profile type iptc", rawProfile, true);
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case mdXmp:
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return makeUtf8TxtChunk("XML:com.adobe.xmp", metadata, false);
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case mdExif:
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case mdIccProfile:
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case mdNone:
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return {};
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@ -39,6 +39,7 @@ constexpr unsigned char pngBlank[] = {
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};
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const auto nullComp = reinterpret_cast<const Exiv2::byte*>("\0\0");
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const auto typeExif = reinterpret_cast<const Exiv2::byte*>("eXIf");
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const auto typeICCP = reinterpret_cast<const Exiv2::byte*>("iCCP");
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inline bool compare(std::string_view str, const Exiv2::DataBuf& buf) {
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const auto minlen = std::min(str.size(), buf.size());
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@ -306,7 +307,7 @@ void PngImage::printStructure(std::ostream& out, PrintStructureOption option, si
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bGood = (3 <= dataOffset) && (start < dataOffset - 3); // good if not a nul chunk
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}
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if (eXIf) {
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bGood = true; // eXIf requires no pre-processing)
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bGood = true; // eXIf requires no pre-processing
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}
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// format is content dependent
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@ -548,8 +549,7 @@ void PngImage::doWriteMetadata(BasicIo& outIo) {
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}
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if (!strcmp(szChunk, "eXIf") || !strcmp(szChunk, "iCCP")) {
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// do nothing (strip): Exif metadata is written following IHDR
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// as zTXt chunk with signature "Raw profile type exif",
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// together with the ICC profile as a fresh iCCP chunk
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// together with the ICC profile as fresh eXIf and iCCP chunks
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#ifdef EXIV2_DEBUG_MESSAGES
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std::cout << "Exiv2::PngImage::doWriteMetadata: strip " << szChunk << " chunk (length: " << dataOffset << ")"
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<< std::endl;
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@ -575,13 +575,24 @@ void PngImage::doWriteMetadata(BasicIo& outIo) {
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Blob blob;
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ExifParser::encode(blob, littleEndian, exifData_);
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if (!blob.empty()) {
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static const char exifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
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std::string rawExif =
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std::string(exifHeader, 6) + std::string(reinterpret_cast<const char*>(blob.data()), blob.size());
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std::string chunk = PngChunk::makeMetadataChunk(rawExif, mdExif);
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if (outIo.write(reinterpret_cast<const byte*>(chunk.data()), chunk.size()) != chunk.size()) {
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byte length[4];
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ul2Data(length, static_cast<uint32_t>(blob.size()), bigEndian);
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// calculate CRC
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uLong tmp = crc32(0L, Z_NULL, 0);
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tmp = crc32(tmp, typeExif, 4);
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tmp = crc32(tmp, blob.data(), static_cast<uint32_t>(blob.size()));
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byte crc[4];
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ul2Data(crc, tmp, bigEndian);
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if (outIo.write(length, 4) != 4 || outIo.write(typeExif, 4) != 4 ||
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outIo.write(blob.data(), blob.size()) != blob.size() || outIo.write(crc, 4) != 4) {
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throw Error(ErrorCode::kerImageWriteFailed);
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}
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#ifdef EXIV2_DEBUG_MESSAGES
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std::cout << "Exiv2::PngImage::doWriteMetadata: build eXIf"
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<< " chunk (length: " << blob.size() << ")" << std::endl;
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#endif
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}
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}
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@ -623,7 +634,7 @@ void PngImage::doWriteMetadata(BasicIo& outIo) {
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}
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#ifdef EXIV2_DEBUG_MESSAGES
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std::cout << "Exiv2::PngImage::doWriteMetadata: build iCCP"
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<< " chunk (length: " << compressed.size() + chunkLength << ")" << std::endl;
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<< " chunk (length: " << chunkLength << ")" << std::endl;
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#endif
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}
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}
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@ -308,152 +308,152 @@ STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | iTXt | 31 | Description.....x.KLJNIMK..... | 0xc1fefec8
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76 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8549 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9197 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168394 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175562 | gAMA | 4 | .... | 0x0bfc6105
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1175578 | bKGD | 6 | ...... | 0xa0bda793
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1175596 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175617 | tIME | 7 | ......2 | 0x582d32e4
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1175636 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175926 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184130 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192334 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200538 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208742 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215927 | IEND | 0 | | 0xae426082
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76 | eXIf | 8408 | II*.......................... | 0x81634e71
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8496 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9144 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168341 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175509 | gAMA | 4 | .... | 0x0bfc6105
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1175525 | bKGD | 6 | ...... | 0xa0bda793
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1175543 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175564 | tIME | 7 | ......2 | 0x582d32e4
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1175583 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175873 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184077 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192281 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200485 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208689 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215874 | IEND | 0 | | 0xae426082
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abcdefg
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STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8506 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9154 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168351 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175519 | gAMA | 4 | .... | 0x0bfc6105
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1175535 | bKGD | 6 | ...... | 0xa0bda793
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1175553 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175574 | tIME | 7 | ......2 | 0x582d32e4
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1175593 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175883 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184087 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192291 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200495 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208699 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215884 | IEND | 0 | | 0xae426082
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33 | eXIf | 8408 | II*.......................... | 0x81634e71
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8453 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9101 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168298 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175466 | gAMA | 4 | .... | 0x0bfc6105
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1175482 | bKGD | 6 | ...... | 0xa0bda793
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1175500 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175521 | tIME | 7 | ......2 | 0x582d32e4
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1175540 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175830 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184034 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192238 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200442 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208646 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215831 | IEND | 0 | | 0xae426082
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STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8506 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9154 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168351 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175519 | gAMA | 4 | .... | 0x0bfc6105
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1175535 | bKGD | 6 | ...... | 0xa0bda793
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1175553 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175574 | tIME | 7 | ......2 | 0x582d32e4
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1175593 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175883 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184087 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192291 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200495 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208699 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215884 | IEND | 0 | | 0xae426082
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33 | eXIf | 8408 | II*.......................... | 0x81634e71
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8453 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9101 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168298 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175466 | gAMA | 4 | .... | 0x0bfc6105
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1175482 | bKGD | 6 | ...... | 0xa0bda793
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1175500 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175521 | tIME | 7 | ......2 | 0x582d32e4
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1175540 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175830 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184034 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192238 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200442 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208646 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215831 | IEND | 0 | | 0xae426082
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STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | iTXt | 31 | Description.....x.KLJNIMK..... | 0xc1fefec8
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76 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8549 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9197 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168394 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175562 | gAMA | 4 | .... | 0x0bfc6105
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1175578 | bKGD | 6 | ...... | 0xa0bda793
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1175596 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175617 | tIME | 7 | ......2 | 0x582d32e4
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1175636 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175926 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184130 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192334 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200538 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208742 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215927 | IEND | 0 | | 0xae426082
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76 | eXIf | 8408 | II*.......................... | 0x81634e71
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8496 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9144 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168341 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175509 | gAMA | 4 | .... | 0x0bfc6105
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1175525 | bKGD | 6 | ...... | 0xa0bda793
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1175543 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175564 | tIME | 7 | ......2 | 0x582d32e4
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1175583 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175873 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184077 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192281 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200485 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208689 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215874 | IEND | 0 | | 0xae426082
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abcdefg
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STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8506 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9154 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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1168351 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175519 | gAMA | 4 | .... | 0x0bfc6105
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1175535 | bKGD | 6 | ...... | 0xa0bda793
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1175553 | pHYs | 9 | ...#...#. | 0x78a53f76
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||||
1175574 | tIME | 7 | ......2 | 0x582d32e4
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1175593 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175883 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184087 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192291 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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||||
1200495 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
|
||||
1208699 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215884 | IEND | 0 | | 0xae426082
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33 | eXIf | 8408 | II*.......................... | 0x81634e71
|
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8453 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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||||
9101 | iCCP | 1159185 | ICC profile..x...uP.[..9@.HB.D | 0xd3dbe519
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||||
1168298 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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1175466 | gAMA | 4 | .... | 0x0bfc6105
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1175482 | bKGD | 6 | ...... | 0xa0bda793
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1175500 | pHYs | 9 | ...#...#. | 0x78a53f76
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1175521 | tIME | 7 | ......2 | 0x582d32e4
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1175540 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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1175830 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
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1184034 | IDAT | 8192 | .F('.T)/....D"]..."2 '(...D%.. | 0x52c572c0
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1192238 | IDAT | 8192 | y-.....>....3..p.....$....E.Bj | 0x65a90ffb
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1200442 | IDAT | 8192 | ....S....?..G.....G........... | 0xf44da161
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1208646 | IDAT | 7173 | .evl...3K..j.S.....x......Z .D | 0xbe6d3574
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1215831 | IEND | 0 | | 0xae426082
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STRUCTURE OF PNG FILE: ReaganLargePng.png
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address | chunk | length | data | checksum
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8 | IHDR | 13 | ............ | 0x8cf910c3
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33 | zTXt | 8461 | Raw profile type exif..x...iv. | 0x91fbf6a0
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8506 | zTXt | 636 | Raw profile type iptc..x..TKn. | 0x4e5178d3
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9154 | iCCP | 293 | ICC profile..x.c``2ptqre.``..+ | 0x7d41600b
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9459 | iTXt | 7156 | XML:com.adobe.xmp.....<?xpacke | 0x8d6d70ba
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16627 | gAMA | 4 | .... | 0x0bfc6105
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16643 | bKGD | 6 | ...... | 0xa0bda793
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16661 | pHYs | 9 | ...#...#. | 0x78a53f76
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16682 | tIME | 7 | ......2 | 0x582d32e4
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16701 | zTXt | 278 | Comment..x.}..n.@....O..5..h.. | 0xdb1dfff5
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16991 | IDAT | 8192 | x...k.%.u%....D......GWW...ER. | 0x929ed75c
|
||||
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@ -57,12 +57,12 @@ STRUCTURE OF PNG FILE: 1343_exif.png
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changed comment
|
||||
Exif.Image.ImageDescription Ascii 17 Can you read me?
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||||
Exif.Image.XResolution Rational 1 72
|
||||
|
||||
Loading…
Reference in New Issue
Block a user