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54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Sample program to extract a Minolta thumbnail from the makernote
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#include <exiv2/exiv2.hpp>
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#include <cassert>
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#include <iostream>
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int main(int argc, char* const argv[])
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{
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Exiv2::XmpParser::initialize();
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::atexit(Exiv2::XmpParser::terminate);
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#ifdef EXV_ENABLE_BMFF
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Exiv2::enableBMFF();
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#endif
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try {
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if (argc != 2) {
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std::cout << "Usage: " << argv[0] << " file\n";
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return 1;
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}
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auto image = Exiv2::ImageFactory::open(argv[1]);
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image->readMetadata();
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Exiv2::ExifData& exifData = image->exifData();
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if (exifData.empty()) {
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std::string error(argv[1]);
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error += ": No Exif data found in the file";
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throw Exiv2::Error(Exiv2::ErrorCode::kerErrorMessage, error);
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}
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Exiv2::ExifKey key("Exif.Minolta.ThumbnailOffset");
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auto format = exifData.findKey(key);
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if (format != exifData.end()) {
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Exiv2::DataBuf buf = format->dataArea();
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// The first byte of the buffer needs to be patched
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buf.write_uint8(0, 0xff);
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Exiv2::FileIo file("img_thumb.jpg");
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file.open("wb");
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file.write(buf.c_data(), buf.size());
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file.close();
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}
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return 0;
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} catch (Exiv2::AnyError& e) {
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std::cout << "Caught Exiv2 exception '" << e << "'\n";
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return -1;
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}
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}
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