Mercurial > hg > orthanc
annotate Core/Compression/ZlibCompressor.cpp @ 797:37adac56017a
ImageAccessor abstraction
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 06 May 2014 12:47:26 +0200 |
| parents | 2d0a347e8cfc |
| children | a811bdf8b8eb |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
| 689 | 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
| 0 | 4 * Belgium |
| 5 * | |
| 6 * This program is free software: you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU General Public License as | |
| 8 * published by the Free Software Foundation, either version 3 of the | |
| 9 * License, or (at your option) any later version. | |
| 136 | 10 * |
| 11 * In addition, as a special exception, the copyright holders of this | |
| 12 * program give permission to link the code of its release with the | |
| 13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 14 * that use the same license as the "OpenSSL" library), and distribute | |
| 15 * the linked executables. You must obey the GNU General Public License | |
| 16 * in all respects for all of the code used other than "OpenSSL". If you | |
| 17 * modify file(s) with this exception, you may extend this exception to | |
| 18 * your version of the file(s), but you are not obligated to do so. If | |
| 19 * you do not wish to do so, delete this exception statement from your | |
| 20 * version. If you delete this exception statement from all source files | |
| 21 * in the program, then also delete it here. | |
| 0 | 22 * |
| 23 * This program is distributed in the hope that it will be useful, but | |
| 24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 26 * General Public License for more details. | |
| 27 * | |
| 28 * You should have received a copy of the GNU General Public License | |
| 29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 30 **/ | |
| 31 | |
| 32 | |
| 33 #include "ZlibCompressor.h" | |
| 34 | |
| 35 #include <stdio.h> | |
| 36 #include <string.h> | |
| 37 #include <zlib.h> | |
| 59 | 38 #include "../OrthancException.h" |
| 0 | 39 |
| 59 | 40 namespace Orthanc |
| 0 | 41 { |
| 42 void ZlibCompressor::SetCompressionLevel(uint8_t level) | |
| 43 { | |
| 44 if (level >= 10) | |
| 45 { | |
| 59 | 46 throw OrthancException("Zlib compression level must be between 0 (no compression) and 9 (highest compression"); |
| 0 | 47 } |
| 81 | 48 |
| 49 compressionLevel_ = level; | |
| 0 | 50 } |
| 51 | |
| 52 | |
| 53 void ZlibCompressor::Compress(std::string& compressed, | |
| 54 const void* uncompressed, | |
| 55 size_t uncompressedSize) | |
| 56 { | |
| 57 if (uncompressedSize == 0) | |
| 58 { | |
| 59 compressed.clear(); | |
| 60 return; | |
| 61 } | |
| 62 | |
| 63 uLongf compressedSize = compressBound(uncompressedSize); | |
| 64 compressed.resize(compressedSize + sizeof(size_t)); | |
| 65 | |
| 66 int error = compress2 | |
| 67 (reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(size_t), | |
| 68 &compressedSize, | |
| 69 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), | |
| 70 uncompressedSize, | |
| 71 compressionLevel_); | |
| 72 | |
| 73 memcpy(&compressed[0], &uncompressedSize, sizeof(size_t)); | |
| 74 | |
| 75 if (error == Z_OK) | |
| 76 { | |
| 77 compressed.resize(compressedSize + sizeof(size_t)); | |
| 78 return; | |
| 79 } | |
| 80 else | |
| 81 { | |
| 82 compressed.clear(); | |
| 83 | |
| 84 switch (error) | |
| 85 { | |
| 86 case Z_MEM_ERROR: | |
| 59 | 87 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 88 |
| 89 default: | |
| 59 | 90 throw OrthancException(ErrorCode_InternalError); |
| 0 | 91 } |
| 92 } | |
| 93 } | |
| 94 | |
| 95 | |
| 96 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 97 const void* compressed, | |
| 98 size_t compressedSize) | |
| 99 { | |
| 100 if (compressedSize == 0) | |
| 101 { | |
| 102 uncompressed.clear(); | |
| 103 return; | |
| 104 } | |
| 105 | |
| 106 if (compressedSize < sizeof(size_t)) | |
| 107 { | |
| 59 | 108 throw OrthancException("Zlib: The compressed buffer is ill-formed"); |
| 0 | 109 } |
| 110 | |
| 111 size_t uncompressedLength; | |
| 112 memcpy(&uncompressedLength, compressed, sizeof(size_t)); | |
|
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113 |
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114 try |
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115 { |
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116 uncompressed.resize(uncompressedLength); |
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117 } |
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118 catch (...) |
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119 { |
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120 throw OrthancException("Zlib: Corrupted compressed buffer"); |
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121 } |
| 0 | 122 |
| 123 uLongf tmp = uncompressedLength; | |
| 124 int error = uncompress | |
| 125 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 126 &tmp, | |
| 127 reinterpret_cast<const uint8_t*>(compressed) + sizeof(size_t), | |
| 128 compressedSize - sizeof(size_t)); | |
| 129 | |
| 130 if (error != Z_OK) | |
| 131 { | |
| 132 uncompressed.clear(); | |
| 133 | |
| 134 switch (error) | |
| 135 { | |
| 136 case Z_DATA_ERROR: | |
| 59 | 137 throw OrthancException("Zlib: Corrupted or incomplete compressed buffer"); |
| 0 | 138 |
| 139 case Z_MEM_ERROR: | |
| 59 | 140 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 141 |
| 142 default: | |
| 59 | 143 throw OrthancException(ErrorCode_InternalError); |
| 0 | 144 } |
| 145 } | |
| 146 } | |
| 147 } |