exiv2/samples/largeiptc-test.cpp

// ***************************************************************** -*- C++ -*-
// Test for large (>65535 bytes) IPTC buffer

#include <exiv2/iptc.hpp>
#include <exiv2/image.hpp>
#include <exiv2/jpgimage.hpp>
#include <exiv2/futils.hpp>
#include <iostream>
#include <cassert>

int main(int argc, char* const argv[])
try {
    if (argc != 3) {
        std::cout << "Usage: " << argv[0] << " image datafile\n";
        return 1;
    }
    std::string file(argv[1]);
    std::string data(argv[2]);

    // Read data file into data buffer
    Exiv2::FileIo io(data);
    if (io.open() != 0) {
      throw Exiv2::Error(9, io.path(), Exiv2::strError());
    }
    Exiv2::DataBuf buf(io.size());
    std::cout << "Reading " << buf.size_ << " bytes from " << data << "\n";
    io.read(buf.pData_, buf.size_);
    if (io.error() || io.eof()) throw Exiv2::Error(14);

    // Read metadata from file
    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(file);
    assert(image.get() != 0);
    image->readMetadata();

    // Set Preview field to the content of the data file
    Exiv2::DataValue value;
    value.read(buf.pData_, buf.size_);
    Exiv2::IptcData& iptcData = image->iptcData();
    std::cout << "IPTC fields: " << iptcData.size() << "\n";
    iptcData["Iptc.Application2.Preview"] = value;
    std::cout << "IPTC fields: " << iptcData.size() << "\n";

    // Set IRB, compare with IPTC raw data
    Exiv2::DataBuf irb = Exiv2::Photoshop::setIptcIrb(0, 0, iptcData);
    std::cout << "IRB buffer : " << irb.size_ << "\n";
    const Exiv2::byte* record;
    uint32_t sizeHdr;
    uint32_t sizeData;
    Exiv2::Photoshop::locateIptcIrb(irb.pData_, irb.size_, &record, &sizeHdr, &sizeData);
    Exiv2::DataBuf rawIptc = iptcData.copy();
    std::cout << "Comparing IPTC and IRB size... ";
    if (static_cast<uint32_t>(rawIptc.size_) != sizeData) {
        std::cout << "not ";
    }
    std::cout << "ok\n";

    std::cout << "Comparing IPTC and IRB data... ";
    if (0 != memcmp(rawIptc.pData_, record + sizeHdr, sizeData)) {
        std::cout << "not ";
    }
    std::cout << "ok\n";

    // Set Iptc data and write it to the file
    image->writeMetadata();

    return 0;
}
catch (Exiv2::AnyError& e) {
    std::cout << "Caught Exiv2 exception '" << e << "'\n";
    return -1;
}