exiv2/src/cr2image.cpp

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

// included header files
#include "config.h"

#include "cr2image.hpp"
#include "tiffimage.hpp"
#include "cr2header_int.hpp"
#include "tiffcomposite_int.hpp"
#include "tiffimage_int.hpp"
#include "image.hpp"
#include "error.hpp"
#include "futils.hpp"
#include "i18n.h"                // NLS support.

// + standard includes
#include <iostream>
#include <iomanip>
#include <cassert>
#include <cstring>

// *****************************************************************************
// class member definitions
namespace Exiv2 {

    using namespace Internal;

    Cr2Image::Cr2Image(BasicIo::UniquePtr io, bool /*create*/)
        : Image(ImageType::cr2, mdExif | mdIptc | mdXmp, std::move(io))
    {
    } // Cr2Image::Cr2Image

    std::string Cr2Image::mimeType() const
    {
        return "image/x-canon-cr2";
    }

    uint32_t Cr2Image::pixelWidth() const
    {
        auto imageWidth = exifData_.findKey(Exiv2::ExifKey("Exif.Photo.PixelXDimension"));
        if (imageWidth != exifData_.end() && imageWidth->count() > 0) {
            return imageWidth->toUint32();
        }
        return 0;
    }

    uint32_t Cr2Image::pixelHeight() const
    {
        auto imageHeight = exifData_.findKey(Exiv2::ExifKey("Exif.Photo.PixelYDimension"));
        if (imageHeight != exifData_.end() && imageHeight->count() > 0) {
            return imageHeight->toUint32();
        }
        return 0;
    }

    void Cr2Image::printStructure(std::ostream& out, Exiv2::PrintStructureOption option,int depth)
    {
        if (io_->open() != 0) throw Error(kerDataSourceOpenFailed, io_->path(), strError());
        io_->seek(0,BasicIo::beg);
        printTiffStructure(io(),out,option,depth-1);
    }

    void Cr2Image::setComment(std::string_view /*comment*/)
    {
        // not supported
        throw(Error(kerInvalidSettingForImage, "Image comment", "CR2"));
    }

    void Cr2Image::readMetadata()
    {
#ifdef EXIV2_DEBUG_MESSAGES
        std::cerr << "Reading CR2 file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(kerDataSourceOpenFailed, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isCr2Type(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(kerFailedToReadImageData);
            throw Error(kerNotAnImage, "CR2");
        }
        clearMetadata();
        ByteOrder bo =
            Cr2Parser::decode(exifData_, iptcData_, xmpData_, io_->mmap(), static_cast<uint32_t>(io_->size()));
        setByteOrder(bo);
    } // Cr2Image::readMetadata

    void Cr2Image::writeMetadata()
    {
#ifdef EXIV2_DEBUG_MESSAGES
        std::cerr << "Writing CR2 file " << io_->path() << "\n";
#endif
        ByteOrder bo = byteOrder();
        byte* pData = nullptr;
        long size = 0;
        IoCloser closer(*io_);
        if (io_->open() == 0) {
            // Ensure that this is the correct image type
            if (isCr2Type(*io_, false)) {
                pData = io_->mmap(true);
                size = static_cast<long>(io_->size());
                Cr2Header cr2Header;
                if (0 == cr2Header.read(pData, 16)) {
                    bo = cr2Header.byteOrder();
                }
            }
        }
        if (bo == invalidByteOrder) {
            bo = littleEndian;
        }
        setByteOrder(bo);
        Cr2Parser::encode(*io_, pData, size, bo, exifData_, iptcData_, xmpData_); // may throw
    } // Cr2Image::writeMetadata

    ByteOrder Cr2Parser::decode(
              ExifData& exifData,
              IptcData& iptcData,
              XmpData&  xmpData,
        const byte*     pData,
              uint32_t  size
    )
    {
        Cr2Header cr2Header;
        return TiffParserWorker::decode(exifData,
                                        iptcData,
                                        xmpData,
                                        pData,
                                        size,
                                        Tag::root,
                                        TiffMapping::findDecoder,
                                        &cr2Header);
    }

    WriteMethod Cr2Parser::encode(
              BasicIo&  io,
        const byte*     pData,
              uint32_t  size,
              ByteOrder byteOrder,
        const ExifData& exifData,
        const IptcData& iptcData,
        const XmpData&  xmpData
    )
    {
        // Copy to be able to modify the Exif data
        ExifData ed = exifData;

        // Delete IFDs which do not occur in TIFF images
        static const IfdId filteredIfds[] = {
            panaRawId
        };
        for (auto&& filteredIfd : filteredIfds) {
#ifdef EXIV2_DEBUG_MESSAGES
            std::cerr << "Warning: Exif IFD " << filteredIfd << " not encoded\n";
#endif
            ed.erase(std::remove_if(ed.begin(), ed.end(), FindExifdatum(filteredIfd)), ed.end());
        }

        Cr2Header header(byteOrder);
        OffsetWriter offsetWriter;
        offsetWriter.setOrigin(OffsetWriter::cr2RawIfdOffset, Cr2Header::offset2addr(), byteOrder);
        return TiffParserWorker::encode(io,
                                        pData,
                                        size,
                                        ed,
                                        iptcData,
                                        xmpData,
                                        Tag::root,
                                        TiffMapping::findEncoder,
                                        &header,
                                        &offsetWriter);
    }

    // *************************************************************************
    // free functions
    Image::UniquePtr newCr2Instance(BasicIo::UniquePtr io, bool create)
    {
        auto image = std::make_unique<Cr2Image>(std::move(io), create);
        if (!image->good()) {
            image.reset();
        }
        return image;
    }

    bool isCr2Type(BasicIo& iIo, bool advance)
    {
        const int32_t len = 16;
        byte buf[len];
        iIo.read(buf, len);
        if (iIo.error() || iIo.eof()) {
            return false;
        }
        Cr2Header header;
        bool rc = header.read(buf, len);
        if (!advance || !rc) {
            iIo.seek(-len, BasicIo::cur);
        }
        return rc;
    }

}                                       // namespace Exiv2