Mercurial > hg > orthanc
view OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 5095:b52fe770aec0
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author | Alain Mazy <am@osimis.io> |
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date | Wed, 12 Oct 2022 09:22:08 +0200 |
parents | 43e613a7756b |
children | 0ea402b4d901 |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics * Department, University Hospital of Liege, Belgium * Copyright (C) 2017-2022 Osimis S.A., Belgium * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium * * This program is free software: you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation, either version 3 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/>. **/ #include "../PrecompiledHeaders.h" #include "ZlibCompressor.h" #include "../Endianness.h" #include "../OrthancException.h" #include "../Logging.h" #include <stdio.h> #include <string.h> #include <zlib.h> namespace Orthanc { ZlibCompressor::ZlibCompressor() { SetPrefixWithUncompressedSize(true); } void ZlibCompressor::Compress(std::string& compressed, const void* uncompressed, size_t uncompressedSize) { if (uncompressedSize == 0) { compressed.clear(); return; } uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize)) + 1024 /* security margin */; if (compressedSize == 0) { compressedSize = 1; } uint8_t* target; if (HasPrefixWithUncompressedSize()) { compressed.resize(compressedSize + sizeof(uint64_t)); target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); } else { compressed.resize(compressedSize); target = reinterpret_cast<uint8_t*>(&compressed[0]); } int error = compress2(target, &compressedSize, const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), static_cast<uLong>(uncompressedSize), GetCompressionLevel()); if (error != Z_OK) { compressed.clear(); switch (error) { case Z_MEM_ERROR: throw OrthancException(ErrorCode_NotEnoughMemory); default: throw OrthancException(ErrorCode_InternalError); } } // The compression was successful if (HasPrefixWithUncompressedSize()) { uint64_t s = static_cast<uint64_t>(uncompressedSize); // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix s = htole64(s); memcpy(&compressed[0], &s, sizeof(uint64_t)); compressed.resize(compressedSize + sizeof(uint64_t)); } else { compressed.resize(compressedSize); } } void ZlibCompressor::Uncompress(std::string& uncompressed, const void* compressed, size_t compressedSize) { if (compressedSize == 0) { uncompressed.clear(); return; } if (!HasPrefixWithUncompressedSize()) { throw OrthancException(ErrorCode_InternalError, "Cannot guess the uncompressed size of a zlib-encoded buffer"); } uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix uncompressedSize = le64toh(uncompressedSize); try { uncompressed.resize(static_cast<size_t>(uncompressedSize)); } catch (...) { throw OrthancException(ErrorCode_NotEnoughMemory); } uLongf tmp = static_cast<uLongf>(uncompressedSize); int error = uncompress (reinterpret_cast<uint8_t*>(&uncompressed[0]), &tmp, reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), static_cast<uLong>(compressedSize - sizeof(uint64_t))); if (error != Z_OK) { uncompressed.clear(); switch (error) { case Z_DATA_ERROR: throw OrthancException(ErrorCode_CorruptedFile); case Z_MEM_ERROR: throw OrthancException(ErrorCode_NotEnoughMemory); default: throw OrthancException(ErrorCode_InternalError); } } } }