Mercurial > hg > orthanc
annotate Core/Compression/ZlibCompressor.cpp @ 1511:7962563129c9
starting support of deflate/gzip content types
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 10 Aug 2015 14:18:24 +0200 |
| parents | 6e7e5ed91c2d |
| children | 52dc56bcec7d |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
| 0 | 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 | |
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33 #include "../PrecompiledHeaders.h" |
| 0 | 34 #include "ZlibCompressor.h" |
| 35 | |
| 36 #include <stdio.h> | |
| 37 #include <string.h> | |
| 38 #include <zlib.h> | |
| 59 | 39 #include "../OrthancException.h" |
| 0 | 40 |
| 59 | 41 namespace Orthanc |
| 0 | 42 { |
| 43 void ZlibCompressor::SetCompressionLevel(uint8_t level) | |
| 44 { | |
| 45 if (level >= 10) | |
| 46 { | |
| 59 | 47 throw OrthancException("Zlib compression level must be between 0 (no compression) and 9 (highest compression"); |
| 0 | 48 } |
| 81 | 49 |
| 50 compressionLevel_ = level; | |
| 0 | 51 } |
| 52 | |
| 53 | |
| 54 void ZlibCompressor::Compress(std::string& compressed, | |
| 55 const void* uncompressed, | |
| 56 size_t uncompressedSize) | |
| 57 { | |
| 58 if (uncompressedSize == 0) | |
| 59 { | |
| 60 compressed.clear(); | |
| 61 return; | |
| 62 } | |
| 63 | |
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64 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */; |
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65 if (compressedSize == 0) |
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66 { |
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67 compressedSize = 1; |
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68 } |
| 0 | 69 |
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70 uint8_t* target; |
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71 if (prefixWithUncompressedSize_) |
| 0 | 72 { |
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73 compressed.resize(compressedSize + sizeof(uint64_t)); |
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74 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
| 0 | 75 } |
| 76 else | |
| 77 { | |
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78 compressed.resize(compressedSize); |
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79 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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80 } |
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81 |
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82 int error = compress2(target, |
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83 &compressedSize, |
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84 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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85 uncompressedSize, |
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86 compressionLevel_); |
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87 |
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88 if (error != Z_OK) |
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89 { |
| 0 | 90 compressed.clear(); |
| 91 | |
| 92 switch (error) | |
| 93 { | |
| 94 case Z_MEM_ERROR: | |
| 59 | 95 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 96 |
| 97 default: | |
| 59 | 98 throw OrthancException(ErrorCode_InternalError); |
| 0 | 99 } |
| 100 } | |
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101 |
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102 // The compression was successful |
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103 if (prefixWithUncompressedSize_) |
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104 { |
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105 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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106 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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107 compressed.resize(compressedSize + sizeof(uint64_t)); |
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108 } |
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109 else |
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110 { |
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111 compressed.resize(compressedSize); |
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112 } |
| 0 | 113 } |
| 114 | |
| 115 | |
| 116 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 117 const void* compressed, | |
| 118 size_t compressedSize) | |
| 119 { | |
| 120 if (compressedSize == 0) | |
| 121 { | |
| 122 uncompressed.clear(); | |
| 123 return; | |
| 124 } | |
| 125 | |
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126 if (compressedSize < sizeof(uint64_t)) |
| 0 | 127 { |
| 59 | 128 throw OrthancException("Zlib: The compressed buffer is ill-formed"); |
| 0 | 129 } |
| 130 | |
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131 uint64_t uncompressedSize; |
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132 memcpy(&uncompressedSize, compressed, sizeof(uint64_t)); |
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133 |
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134 try |
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135 { |
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136 uncompressed.resize(uncompressedSize); |
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137 } |
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138 catch (...) |
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139 { |
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140 throw OrthancException("Zlib: Corrupted compressed buffer"); |
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141 } |
| 0 | 142 |
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143 uLongf tmp = uncompressedSize; |
| 0 | 144 int error = uncompress |
| 145 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 146 &tmp, | |
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147 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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148 compressedSize - sizeof(uint64_t)); |
| 0 | 149 |
| 150 if (error != Z_OK) | |
| 151 { | |
| 152 uncompressed.clear(); | |
| 153 | |
| 154 switch (error) | |
| 155 { | |
| 156 case Z_DATA_ERROR: | |
| 59 | 157 throw OrthancException("Zlib: Corrupted or incomplete compressed buffer"); |
| 0 | 158 |
| 159 case Z_MEM_ERROR: | |
| 59 | 160 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 161 |
| 162 default: | |
| 59 | 163 throw OrthancException(ErrorCode_InternalError); |
| 0 | 164 } |
| 165 } | |
| 166 } | |
| 167 } |