Mercurial > hg > orthanc
annotate Core/Compression/ZlibCompressor.cpp @ 3844:c9c34bb50f0a
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 16 Apr 2020 17:27:18 +0200 |
| parents | 94f4a18a79cc |
| children |
| rev | line source |
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| 0 | 1 /** |
| 59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
| 0 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU General Public License as | |
| 9 * published by the Free Software Foundation, either version 3 of the | |
| 10 * License, or (at your option) any later version. | |
| 136 | 11 * |
| 12 * In addition, as a special exception, the copyright holders of this | |
| 13 * program give permission to link the code of its release with the | |
| 14 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 15 * that use the same license as the "OpenSSL" library), and distribute | |
| 16 * the linked executables. You must obey the GNU General Public License | |
| 17 * in all respects for all of the code used other than "OpenSSL". If you | |
| 18 * modify file(s) with this exception, you may extend this exception to | |
| 19 * your version of the file(s), but you are not obligated to do so. If | |
| 20 * you do not wish to do so, delete this exception statement from your | |
| 21 * version. If you delete this exception statement from all source files | |
| 22 * in the program, then also delete it here. | |
| 0 | 23 * |
| 24 * This program is distributed in the hope that it will be useful, but | |
| 25 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 27 * General Public License for more details. | |
| 28 * | |
| 29 * You should have received a copy of the GNU General Public License | |
| 30 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 31 **/ | |
| 32 | |
| 33 | |
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34 #include "../PrecompiledHeaders.h" |
| 0 | 35 #include "ZlibCompressor.h" |
| 36 | |
| 1513 | 37 #include "../OrthancException.h" |
| 38 #include "../Logging.h" | |
| 39 | |
| 0 | 40 #include <stdio.h> |
| 41 #include <string.h> | |
| 42 #include <zlib.h> | |
| 43 | |
| 59 | 44 namespace Orthanc |
| 0 | 45 { |
| 46 void ZlibCompressor::Compress(std::string& compressed, | |
| 47 const void* uncompressed, | |
| 48 size_t uncompressedSize) | |
| 49 { | |
| 50 if (uncompressedSize == 0) | |
| 51 { | |
| 52 compressed.clear(); | |
| 53 return; | |
| 54 } | |
| 55 | |
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56 uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize)) |
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57 + 1024 /* security margin */; |
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58 if (compressedSize == 0) |
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59 { |
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60 compressedSize = 1; |
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61 } |
| 0 | 62 |
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63 uint8_t* target; |
| 1512 | 64 if (HasPrefixWithUncompressedSize()) |
| 0 | 65 { |
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66 compressed.resize(compressedSize + sizeof(uint64_t)); |
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67 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
| 0 | 68 } |
| 69 else | |
| 70 { | |
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71 compressed.resize(compressedSize); |
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72 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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73 } |
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74 |
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75 int error = compress2(target, |
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76 &compressedSize, |
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77 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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78 static_cast<uLong>(uncompressedSize), |
| 1512 | 79 GetCompressionLevel()); |
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80 |
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81 if (error != Z_OK) |
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82 { |
| 0 | 83 compressed.clear(); |
| 84 | |
| 85 switch (error) | |
| 86 { | |
| 87 case Z_MEM_ERROR: | |
| 59 | 88 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 89 |
| 90 default: | |
| 59 | 91 throw OrthancException(ErrorCode_InternalError); |
| 0 | 92 } |
| 93 } | |
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94 |
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95 // The compression was successful |
| 1512 | 96 if (HasPrefixWithUncompressedSize()) |
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97 { |
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98 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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99 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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100 compressed.resize(compressedSize + sizeof(uint64_t)); |
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101 } |
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102 else |
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103 { |
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104 compressed.resize(compressedSize); |
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105 } |
| 0 | 106 } |
| 107 | |
| 108 | |
| 109 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 110 const void* compressed, | |
| 111 size_t compressedSize) | |
| 112 { | |
| 113 if (compressedSize == 0) | |
| 114 { | |
| 115 uncompressed.clear(); | |
| 116 return; | |
| 117 } | |
| 118 | |
| 1513 | 119 if (!HasPrefixWithUncompressedSize()) |
| 0 | 120 { |
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121 throw OrthancException(ErrorCode_InternalError, |
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122 "Cannot guess the uncompressed size of a zlib-encoded buffer"); |
| 0 | 123 } |
| 124 | |
| 1513 | 125 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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126 |
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127 try |
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128 { |
| 1545 | 129 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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130 } |
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131 catch (...) |
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132 { |
| 1513 | 133 throw OrthancException(ErrorCode_NotEnoughMemory); |
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134 } |
| 0 | 135 |
| 1545 | 136 uLongf tmp = static_cast<uLongf>(uncompressedSize); |
| 0 | 137 int error = uncompress |
| 138 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 139 &tmp, | |
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140 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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141 static_cast<uLong>(compressedSize - sizeof(uint64_t))); |
| 0 | 142 |
| 143 if (error != Z_OK) | |
| 144 { | |
| 145 uncompressed.clear(); | |
| 146 | |
| 147 switch (error) | |
| 148 { | |
| 149 case Z_DATA_ERROR: | |
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150 throw OrthancException(ErrorCode_CorruptedFile); |
| 0 | 151 |
| 152 case Z_MEM_ERROR: | |
| 59 | 153 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 154 |
| 155 default: | |
| 59 | 156 throw OrthancException(ErrorCode_InternalError); |
| 0 | 157 } |
| 158 } | |
| 159 } | |
| 160 } |