metacopy.cpp

Demonstrates copying metadata from one image to another

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2021 Exiv2 authors
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
#include <exiv2/exiv2.hpp>
#include <iostream>
#include <fstream>
#include <cassert>
 
// include local header files which are not part of libexiv2
#include "getopt.hpp"
#include "metacopy.hpp"
 
// *****************************************************************************
// Main
int main(int argc, char* const argv[])
{
try {
    Exiv2::XmpParser::initialize();
    ::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
    Exiv2::enableBMFF();
#endif
 
    // Handle command line arguments
    Params params;
    if (params.getopt(argc, argv)) {
        params.usage();
        return 1;
    }
    if (params.help_) {
        params.help();
        return 2;
    }
 
    // Use MemIo to increase test coverage.
    Exiv2::BasicIo::AutoPtr fileIo(new Exiv2::FileIo(params.read_));
    Exiv2::BasicIo::AutoPtr memIo(new Exiv2::MemIo);
    memIo->transfer(*fileIo);
 
    Exiv2::Image::AutoPtr readImg = Exiv2::ImageFactory::open(memIo);
    assert(readImg.get() != 0);
    readImg->readMetadata();
 
    Exiv2::Image::AutoPtr writeImg = Exiv2::ImageFactory::open(params.write_);
    assert(writeImg.get() != 0);
    if (params.preserve_) writeImg->readMetadata();
    if (params.iptc_) {
        writeImg->setIptcData(readImg->iptcData());
    }
    if (params.exif_) {
        writeImg->setExifData(readImg->exifData());
    }
    if (params.comment_) {
        writeImg->setComment(readImg->comment());
    }
    if (params.xmp_) {
        writeImg->setXmpData(readImg->xmpData());
    }
 
    try {
        writeImg->writeMetadata();
    }
    catch (const Exiv2::AnyError&) {
        std::cerr << params.progname() <<
            ": Could not write metadata to (" << params.write_ << ")\n";
        return 8;
    }
 
    return 0;
}
catch (Exiv2::AnyError& e) {
    std::cerr << "Caught Exiv2 exception '" << e << "'\n";
    return 10;
}
}
 
int Params::option(int opt, const std::string& /*optarg*/, int optopt)
{
    int rc = 0;
    switch (opt) {
    case 'h': {help_ = true; break;}
    case 'i': {iptc_ = true; break;}
    case 'e': {exif_ = true; break;}
    case 'c': {comment_ = true; break;}
    case 'x': {xmp_ = true; break;}
    case 'p': {preserve_ = true; break;}
    case 'a':{
        iptc_ =true;
        exif_ =true;
        comment_ =true;
        xmp_ =true;
        break;
    }
    case ':':{
        std::cerr << progname() << ": Option -" << static_cast<char>(optopt)
                  << " requires an argument\n";
        rc = 1;
        break;
    }
    case '?':{
        std::cerr << progname() << ": Unrecognized option -"
                  << static_cast<char>(optopt) << "\n";
        rc = 1;
        break;
    }
    default:{
        std::cerr << progname()
                  << ": getopt returned unexpected character code "
                  << std::hex << opt << "\n";
        rc = 1;
        break;
    }
    }
    
    return rc;
}
 
int Params::nonoption(const std::string& argv)
{
    if (!write_.empty()) {
        std::cerr << progname() << ": Unexpected extra argument (" << argv << ")\n";
        return 1;
    }
    if (first_) read_ = argv;
    else write_ = argv;
    first_ = false;
    return 0;
}
 
int Params::getopt(int argc, char* const argv[])
{
    int rc = Util::Getopt::getopt(argc, argv, optstring_);
    // Further consistency checks
    if (help_==false) {
        if (rc==0 && read_.empty() ) {
            std::cerr << progname() << ": Read and write files must be specified\n";
            rc = 1;
        }
        if (rc==0 && write_.empty() ) {
            std::cerr << progname() << ": Write file must be specified\n";
            rc = 1;
        }
        if (preserve_ && iptc_ && exif_ && comment_ && xmp_ ) {
            std::cerr << progname() << ": Option -p has no effect when all metadata types are specified.\n";
            rc = 1;
        }
    }
    return rc;
} // Params::getopt
 
 
void Params::usage(std::ostream& os) const
{
    os << "\nReads and writes raw metadata. Use -h option for help.\n"
       << "Usage: " << progname()
       << " [-iecxaph] readfile writefile\n";
}
 
void Params::help(std::ostream& os) const
{
    usage(os);
    os << "\nOptions:\n"
       << "   -i      Read Iptc data from readfile and write to writefile.\n"
       << "   -e      Read Exif data from readfile and write to writefile.\n"
       << "   -c      Read Jpeg comment from readfile and write to writefile.\n"
       << "   -x      Read XMP data from readfile and write to writefile.\n"
       << "   -a      Read all metadata from readfile and write to writefile.\n"
       << "   -p      Preserve existing metadata in writefile if not replaced.\n"
       << "   -h      Display this help and exit.\n\n";
} // Params::help