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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// included header files
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#include "gifimage.hpp"
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#include "config.h"
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#include "error.hpp"
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#include "futils.hpp"
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#include <iostream>
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// *****************************************************************************
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// class member definitions
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namespace Exiv2 {
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GifImage::GifImage(BasicIo::UniquePtr io) : Image(ImageType::gif, mdNone, std::move(io)) {
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}
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std::string GifImage::mimeType() const {
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return "image/gif";
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}
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void GifImage::setExifData(const ExifData& /*exifData*/) {
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// Todo: implement me!
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throw(Error(ErrorCode::kerInvalidSettingForImage, "Exif metadata", "GIF"));
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}
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void GifImage::setIptcData(const IptcData& /*iptcData*/) {
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// Todo: implement me!
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throw(Error(ErrorCode::kerInvalidSettingForImage, "IPTC metadata", "GIF"));
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}
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void GifImage::setComment(const std::string&) {
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// not supported
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throw(Error(ErrorCode::kerInvalidSettingForImage, "Image comment", "GIF"));
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}
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void GifImage::readMetadata() {
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#ifdef EXIV2_DEBUG_MESSAGES
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std::cerr << "Exiv2::GifImage::readMetadata: Reading GIF file " << io_->path() << "\n";
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#endif
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if (io_->open() != 0) {
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throw Error(ErrorCode::kerDataSourceOpenFailed, io_->path(), strError());
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}
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IoCloser closer(*io_);
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// Ensure that this is the correct image type
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if (!isGifType(*io_, true)) {
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if (io_->error() || io_->eof())
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throw Error(ErrorCode::kerFailedToReadImageData);
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throw Error(ErrorCode::kerNotAnImage, "GIF");
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}
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clearMetadata();
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byte buf[4];
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if (io_->read(buf, sizeof(buf)) == sizeof(buf)) {
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pixelWidth_ = getShort(buf, littleEndian);
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pixelHeight_ = getShort(buf + 2, littleEndian);
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}
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} // GifImage::readMetadata
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void GifImage::writeMetadata() {
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// Todo: implement me!
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throw(Error(ErrorCode::kerWritingImageFormatUnsupported, "GIF"));
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} // GifImage::writeMetadata
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// *************************************************************************
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// free functions
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Image::UniquePtr newGifInstance(BasicIo::UniquePtr io, bool /*create*/) {
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auto image = std::make_unique<GifImage>(std::move(io));
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if (!image->good()) {
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return nullptr;
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}
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return image;
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}
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bool isGifType(BasicIo& iIo, bool advance) {
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const int32_t len = 6;
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const unsigned char Gif87aId[8] = {'G', 'I', 'F', '8', '7', 'a'};
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const unsigned char Gif89aId[8] = {'G', 'I', 'F', '8', '9', 'a'};
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byte buf[len];
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iIo.read(buf, len);
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if (iIo.error() || iIo.eof()) {
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return false;
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}
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bool matched = (memcmp(buf, Gif87aId, len) == 0) || (memcmp(buf, Gif89aId, len) == 0);
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if (!advance || !matched) {
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iIo.seek(-len, BasicIo::cur);
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}
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return matched;
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}
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} // namespace Exiv2
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