107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/***************************************************************************
|
|
copyright : (C) 2016 by Tsuda Kageyu
|
|
email : tsuda.kageyu@gmail.com
|
|
***************************************************************************/
|
|
|
|
/***************************************************************************
|
|
* This library is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU Lesser General Public License version *
|
|
* 2.1 as published by the Free Software Foundation. *
|
|
* *
|
|
* This library 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 *
|
|
* Lesser General Public License for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU Lesser General Public *
|
|
* License along with this library; if not, write to the Free Software *
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
|
|
* 02110-1301 USA *
|
|
* *
|
|
* Alternatively, this file is available under the Mozilla Public *
|
|
* License Version 1.1. You may obtain a copy of the License at *
|
|
* http://www.mozilla.org/MPL/ *
|
|
***************************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_ZLIB
|
|
# include <zlib.h>
|
|
# include <tstring.h>
|
|
# include <tdebug.h>
|
|
#endif
|
|
|
|
#include "tzlib.h"
|
|
|
|
using namespace TagLib;
|
|
|
|
bool zlib::isAvailable()
|
|
{
|
|
#ifdef HAVE_ZLIB
|
|
|
|
return true;
|
|
|
|
#else
|
|
|
|
return false;
|
|
|
|
#endif
|
|
}
|
|
|
|
ByteVector zlib::decompress(const ByteVector &data)
|
|
{
|
|
#ifdef HAVE_ZLIB
|
|
|
|
z_stream stream = {};
|
|
|
|
if(inflateInit(&stream) != Z_OK) {
|
|
debug("zlib::decompress() - Failed to initizlize zlib.");
|
|
return ByteVector();
|
|
}
|
|
|
|
ByteVector inData = data;
|
|
|
|
stream.avail_in = static_cast<uInt>(inData.size());
|
|
stream.next_in = reinterpret_cast<Bytef *>(inData.data());
|
|
|
|
const unsigned int chunkSize = 1024;
|
|
|
|
ByteVector outData;
|
|
|
|
do {
|
|
const size_t offset = outData.size();
|
|
outData.resize(outData.size() + chunkSize);
|
|
|
|
stream.avail_out = static_cast<uInt>(chunkSize);
|
|
stream.next_out = reinterpret_cast<Bytef *>(outData.data() + offset);
|
|
|
|
const int result = inflate(&stream, Z_NO_FLUSH);
|
|
|
|
if(result == Z_STREAM_ERROR ||
|
|
result == Z_NEED_DICT ||
|
|
result == Z_DATA_ERROR ||
|
|
result == Z_MEM_ERROR)
|
|
{
|
|
if(result != Z_STREAM_ERROR)
|
|
inflateEnd(&stream);
|
|
|
|
debug("zlib::decompress() - Error reading compressed stream.");
|
|
return ByteVector();
|
|
}
|
|
|
|
outData.resize(outData.size() - stream.avail_out);
|
|
} while(stream.avail_out == 0);
|
|
|
|
inflateEnd(&stream);
|
|
|
|
return outData;
|
|
|
|
#else
|
|
|
|
return ByteVector();
|
|
|
|
#endif
|
|
}
|