Mercurial > hg > orthanc
view Core/Compression/ZlibCompressor.cpp @ 837:a4d2be5154a9
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 02 Jun 2014 13:01:02 +0200 |
parents | a811bdf8b8eb |
children | 6e7e5ed91c2d |
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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); } } } }