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74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
// ***************************************************************** -*- C++ -*-
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// mrwthumb.cpp
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// Sample program to extract a Minolta thumbnail from the makernote
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/*
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* Copyright (C) 2004-2021 Exiv2 authors
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* This program is part of the Exiv2 distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
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*/
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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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Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(argv[1]);
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assert(image.get() != 0);
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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::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.pData_[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.pData_, 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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