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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
* Belgium
*
* 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 3 of the
* License, or (at your option) any later version.
*
* In addition, as a special exception, the copyright holders of this
* program give permission to link the code of its release with the
* OpenSSL project's "OpenSSL" library (or with modified versions of it
* that use the same license as the "OpenSSL" library), and distribute
* the linked executables. You must obey the GNU General Public License
* in all respects for all of the code used other than "OpenSSL". If you
* modify file(s) with this exception, you may extend this exception to
* your version of the file(s), but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source files
* in the program, then also delete it here.
*
* 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, see <http://www.gnu.org/licenses/>.
**/
#include "../PrecompiledHeaders.h"
#include "ZlibCompressor.h"
#include <stdio.h>
#include <string.h>
#include <zlib.h>
#include "../OrthancException.h"
namespace Orthanc
{
void ZlibCompressor::SetCompressionLevel(uint8_t level)
{
if (level >= 10)
{
throw OrthancException("Zlib compression level must be between 0 (no compression) and 9 (highest compression");
}
compressionLevel_ = level;
}
void ZlibCompressor::Compress(std::string& compressed,
const void* uncompressed,
size_t uncompressedSize)
{
if (uncompressedSize == 0)
{
compressed.clear();
return;
}
uLongf compressedSize = compressBound(uncompressedSize);
compressed.resize(compressedSize + sizeof(size_t));
int error = compress2
(reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(size_t),
&compressedSize,
const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
uncompressedSize,
compressionLevel_);
memcpy(&compressed[0], &uncompressedSize, sizeof(size_t));
if (error == Z_OK)
{
compressed.resize(compressedSize + sizeof(size_t));
return;
}
else
{
compressed.clear();
switch (error)
{
case Z_MEM_ERROR:
throw OrthancException(ErrorCode_NotEnoughMemory);
default:
throw OrthancException(ErrorCode_InternalError);
}
}
}
void ZlibCompressor::Uncompress(std::string& uncompressed,
const void* compressed,
size_t compressedSize)
{
if (compressedSize == 0)
{
uncompressed.clear();
return;
}
if (compressedSize < sizeof(size_t))
{
throw OrthancException("Zlib: The compressed buffer is ill-formed");
}
size_t uncompressedLength;
memcpy(&uncompressedLength, compressed, sizeof(size_t));
try
{
uncompressed.resize(uncompressedLength);
}
catch (...)
{
throw OrthancException("Zlib: Corrupted compressed buffer");
}
uLongf tmp = uncompressedLength;
int error = uncompress
(reinterpret_cast<uint8_t*>(&uncompressed[0]),
&tmp,
reinterpret_cast<const uint8_t*>(compressed) + sizeof(size_t),
compressedSize - sizeof(size_t));
if (error != Z_OK)
{
uncompressed.clear();
switch (error)
{
case Z_DATA_ERROR:
throw OrthancException("Zlib: Corrupted or incomplete compressed buffer");
case Z_MEM_ERROR:
throw OrthancException(ErrorCode_NotEnoughMemory);
default:
throw OrthancException(ErrorCode_InternalError);
}
}
}
}
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