exiv2/samples/exifprint.cpp

// SPDX-License-Identifier: GPL-2.0-or-later

#include <exiv2/exiv2.hpp>
#include <iostream>
#include <regex>

// copied from src/tiffvisitor_int.cpp
static const Exiv2::TagInfo* findTag(const Exiv2::TagInfo* pList,uint16_t tag)
{
    while ( pList->tag_ != 0xffff && pList->tag_ != tag ) pList++;
    return pList->tag_ != 0xffff ? pList : nullptr;
}


int main(int argc, char* const argv[])
try {
    setlocale(LC_CTYPE, ".utf8");
    Exiv2::XmpParser::initialize();
    ::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
    Exiv2::enableBMFF();
#endif

    const char* prog = argv[0];
    if (argc == 1) {
        std::cout << "Usage: " << prog << " [ [--lint] path | --version | --version-test ]" << std::endl;
        return 1;
    }

    int    rc          = 0      ;
    const char* file = argv[1];
    bool   bLint       = strcmp(file, "--lint") == 0 && argc == 3;
    if (   bLint ) file= argv[2];


    if ( strcmp(file,"--version") == 0 ) {
        std::vector<std::regex> keys;
        Exiv2::dumpLibraryInfo(std::cout,keys);
        return rc;
    } else if ( strcmp(file,"--version-test") == 0 ) {
        // verifies/test macro EXIV2_TEST_VERSION
        // described in include/exiv2/version.hpp
        std::cout << "EXV_PACKAGE_VERSION             " << EXV_PACKAGE_VERSION             << std::endl
                  << "Exiv2::version()                " << Exiv2::version()                << std::endl
                  << "strlen(Exiv2::version())        " << ::strlen(Exiv2::version())      << std::endl
                  << "Exiv2::versionNumber()          " << Exiv2::versionNumber()          << std::endl
                  << "Exiv2::versionString()          " << Exiv2::versionString()          << std::endl
                  << "Exiv2::versionNumberHexString() " << Exiv2::versionNumberHexString() << std::endl
                  ;

        // Test the Exiv2 version available at runtime but compile the if-clause only if
        // the compile-time version is at least 0.15. Earlier versions didn't have a
        // testVersion() function:
        #if EXIV2_TEST_VERSION(0,15,0)
            if (Exiv2::testVersion(0,13,0)) {
              std::cout << "Available Exiv2 version is equal to or greater than 0.13\n";
            } else {
              std::cout << "Installed Exiv2 version is less than 0.13\n";
            }
        #else
              std::cout << "Compile-time Exiv2 version doesn't have Exiv2::testVersion()\n";
        #endif
        return rc;
    }

    Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(file);
    assert(image.get() != 0);
    image->readMetadata();

    Exiv2::ExifData &exifData = image->exifData();
    if (exifData.empty()) {
        std::string error("No Exif data found in file");
        throw Exiv2::Error(Exiv2::kerErrorMessage, error);
    }
    
    std::set<std::string> shortLong;
    shortLong.insert("Exif.Photo.PixelXDimension");
    shortLong.insert("Exif.Photo.PixelYDimension");
    shortLong.insert("Exif.Photo.ImageLength");
    shortLong.insert("Exif.Photo.ImageWidth");
    shortLong.insert("Exif.Photo.RowsPerStrip");
    shortLong.insert("Exif.Photo.StripOffsets");
    shortLong.insert("Exif.Photo.StripByteCounts");

    auto end = exifData.end();
    for (auto i = exifData.begin(); i != end; ++i) {
        if ( ! bLint ) {
            const char* tn = i->typeName();
            std::cout << std::setw(44) << std::setfill(' ') << std::left
                      << i->key() << " "
                      << "0x" << std::setw(4) << std::setfill('0') << std::right
                      << std::hex << i->tag() << " "
                      << std::setw(9) << std::setfill(' ') << std::left
                      << (tn ? tn : "Unknown") << " "
                      << std::dec << std::setw(3)
                      << std::setfill(' ') << std::right
                      << i->count() << "  "
                      << std::dec << i->toString()
                      << "\n";
        } else {
            const Exiv2::TagInfo* tagInfo = findTag( Exiv2::ExifTags::tagList(i->groupName()),i->tag() );
            if ( tagInfo ) {
                Exiv2::TypeId type = i->typeId();
                if (          type!= tagInfo-> typeId_ 
                &&!(tagInfo->typeId_ == Exiv2::comment && type == Exiv2::undefined) // comment is stored as undefined
                &&!(shortLong.find(i->key())!=shortLong.end() &&(type == Exiv2::unsignedShort||type==Exiv2::unsignedLong)) // can be short or long!
                ) {
                  std::cerr << i->key()
                            << " type " << i->typeName() << " (" << type << ")" 
                            << " expected " << Exiv2::TypeInfo::typeName(tagInfo-> typeId_) << " (" << tagInfo-> typeId_ << ")"
                            << std::endl;
                  rc=2;
                }
            }
        }
    }

    return rc;
}
//catch (std::exception& e) {
//catch (Exiv2::AnyError& e) {
catch (Exiv2::Error& e) {
    std::cout << "Caught Exiv2 exception '" << e.what() << "'\n";
    return -1;
}