// ***************************************************************** -*- C++ -*-
/*
* Copyright (C) 2004-2018 Exiv2 authors
* This program is part of the Exiv2 distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
*/
/*
File: tgaimage.cpp
Author(s): Marco Piovanelli, Ovolab (marco)
History: 05-Mar-2007, marco: created
*/
// *****************************************************************************
// included header files
#include "config.h"
#include "tgaimage.hpp"
#include "image.hpp"
#include "basicio.hpp"
#include "error.hpp"
#include "futils.hpp"
// + standard includes
#include <string>
#include <cstring>
#include <iostream>
// *****************************************************************************
// class member definitions
namespace Exiv2 {
TgaImage::TgaImage(BasicIo::AutoPtr io)
: Image(ImageType::tga, mdNone, io)
{
} // TgaImage::TgaImage
std::string TgaImage::mimeType() const
{
return "image/targa";
}
void TgaImage::setExifData(const ExifData& /*exifData*/)
{
// Todo: implement me!
throw(Error(kerInvalidSettingForImage, "Exif metadata", "TGA"));
}
void TgaImage::setIptcData(const IptcData& /*iptcData*/)
{
// Todo: implement me!
throw(Error(kerInvalidSettingForImage, "IPTC metadata", "TGA"));
}
void TgaImage::setComment(const std::string& /*comment*/)
{
// not supported
throw(Error(kerInvalidSettingForImage, "Image comment", "TGA"));
}
void TgaImage::readMetadata()
{
#ifdef EXIV2_DEBUG_MESSAGES
std::cerr << "Exiv2::TgaImage::readMetadata: Reading TARGA 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 (!isTgaType(*io_, false))
{
if (io_->error() || io_->eof()) throw Error(kerFailedToReadImageData);
throw Error(kerNotAnImage, "TGA");
}
clearMetadata();
/*
The TARGA header goes as follows -- all numbers are in little-endian byte order:
offset length name description
====== ======= ======================= ===========
0 1 byte ID length length of image ID (0 to 255)
1 1 byte color map type 0 = no color map; 1 = color map included
2 1 byte image type 0 = no image;
1 = uncompressed color-mapped;
2 = uncompressed true-color;
3 = uncompressed black-and-white;
9 = RLE-encoded color mapped;
10 = RLE-encoded true-color;
11 = RLE-encoded black-and-white
3 5 bytes color map specification
8 2 bytes x-origin of image
10 2 bytes y-origin of image
12 2 bytes image width
14 2 bytes image height
16 1 byte pixel depth
17 1 byte image descriptor
*/
byte buf[18];
if (io_->read(buf, sizeof(buf)) == sizeof(buf))
{
pixelWidth_ = getShort(buf + 12, littleEndian);
pixelHeight_ = getShort(buf + 14, littleEndian);
}
} // TgaImage::readMetadata
void TgaImage::writeMetadata()
{
// Todo: implement me!
throw(Error(kerWritingImageFormatUnsupported, "TGA"));
} // TgaImage::writeMetadata
// *************************************************************************
// free functions
Image::AutoPtr newTgaInstance(BasicIo::AutoPtr io, bool /*create*/)
{
Image::AutoPtr image(new TgaImage(io));
if (!image->good())
{
image.reset();
}
return image;
}
bool isTgaType(BasicIo& iIo, bool /*advance*/)
{
// not all TARGA files have a signature string, so first just try to match the file name extension
#ifdef EXV_UNICODE_PATH
std::wstring wpath = iIo.wpath();
if( wpath.rfind(EXV_WIDEN(".tga")) != std::wstring::npos
|| wpath.rfind(EXV_WIDEN(".TGA")) != std::wstring::npos) {
return true;
}
#else
std::string path = iIo.path();
if( path.rfind(".tga") != std::string::npos
|| path.rfind(".TGA") != std::string::npos) {
return true;
}
#endif
byte buf[26];
long curPos = iIo.tell();
iIo.seek(-26, BasicIo::end);
if (iIo.error() || iIo.eof())
{
return false;
}
iIo.read(buf, sizeof(buf));
if (iIo.error())
{
return false;
}
// some TARGA files, but not all, have a signature string at the end
bool matched = (memcmp(buf + 8, "TRUEVISION-XFILE", 16) == 0);
iIo.seek(curPos, BasicIo::beg);
return matched;
}
} // namespace Exiv2