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124 lines
4.0 KiB
C++
124 lines
4.0 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// included header files
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#include "tgaimage.hpp"
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#include "basicio.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 "image.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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TgaImage::TgaImage(BasicIo::UniquePtr io) : Image(ImageType::tga, mdNone, std::move(io)) {
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}
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std::string TgaImage::mimeType() const {
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return "image/targa";
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}
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void TgaImage::setExifData(const ExifData& /*exifData*/) {
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// Todo: implement me!
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throw(Error(ErrorCode::kerInvalidSettingForImage, "Exif metadata", "TGA"));
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}
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void TgaImage::setIptcData(const IptcData& /*iptcData*/) {
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// Todo: implement me!
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throw(Error(ErrorCode::kerInvalidSettingForImage, "IPTC metadata", "TGA"));
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}
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void TgaImage::setComment(const std::string&) {
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// not supported
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throw(Error(ErrorCode::kerInvalidSettingForImage, "Image comment", "TGA"));
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}
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void TgaImage::readMetadata() {
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#ifdef EXIV2_DEBUG_MESSAGES
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std::cerr << "Exiv2::TgaImage::readMetadata: Reading TARGA 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 (!isTgaType(*io_, false)) {
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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, "TGA");
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}
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clearMetadata();
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/*
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The TARGA header goes as follows -- all numbers are in little-endian byte order:
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offset length name description
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====== ======= ======================= ===========
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0 1 byte ID length length of image ID (0 to 255)
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1 1 byte color map type 0 = no color map; 1 = color map included
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2 1 byte image type 0 = no image;
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1 = uncompressed color-mapped;
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2 = uncompressed true-color;
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3 = uncompressed black-and-white;
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9 = RLE-encoded color mapped;
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10 = RLE-encoded true-color;
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11 = RLE-encoded black-and-white
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3 5 bytes color map specification
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8 2 bytes x-origin of image
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10 2 bytes y-origin of image
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12 2 bytes image width
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14 2 bytes image height
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16 1 byte pixel depth
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17 1 byte image descriptor
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*/
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byte buf[18];
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if (io_->read(buf, sizeof(buf)) == sizeof(buf)) {
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pixelWidth_ = getShort(buf + 12, littleEndian);
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pixelHeight_ = getShort(buf + 14, littleEndian);
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}
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} // TgaImage::readMetadata
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void TgaImage::writeMetadata() {
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// Todo: implement me!
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throw(Error(ErrorCode::kerWritingImageFormatUnsupported, "TGA"));
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} // TgaImage::writeMetadata
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// *************************************************************************
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// free functions
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Image::UniquePtr newTgaInstance(BasicIo::UniquePtr io, bool /*create*/) {
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auto image = std::make_unique<TgaImage>(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 isTgaType(BasicIo& iIo, bool /*advance*/) {
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// not all TARGA files have a signature string, so first just try to match the file name extension
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const std::string& path = iIo.path();
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if (path.rfind(".tga") != std::string::npos || path.rfind(".TGA") != std::string::npos) {
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return true;
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}
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byte buf[26];
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const size_t curPos = iIo.tell();
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if (curPos < 26)
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return false;
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iIo.seek(-26, BasicIo::end);
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if (iIo.error() || iIo.eof()) {
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return false;
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}
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iIo.read(buf, sizeof(buf));
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if (iIo.error()) {
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return false;
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}
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// some TARGA files, but not all, have a signature string at the end
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bool matched = (memcmp(buf + 8, "TRUEVISION-XFILE", 16) == 0);
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iIo.seek(curPos, BasicIo::beg);
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return matched;
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}
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} // namespace Exiv2
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