Mercurial > hg > orthanc
annotate Core/Compression/ZlibCompressor.cpp @ 1512:52dc56bcec7d
refactoring
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Mon, 10 Aug 2015 14:52:10 +0200 |
| parents | 7962563129c9 |
| children | fe07f82d83d3 |
| 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::Compress(std::string& compressed, | |
| 44 const void* uncompressed, | |
| 45 size_t uncompressedSize) | |
| 46 { | |
| 47 if (uncompressedSize == 0) | |
| 48 { | |
| 49 compressed.clear(); | |
| 50 return; | |
| 51 } | |
| 52 | |
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53 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */; |
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54 if (compressedSize == 0) |
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55 { |
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56 compressedSize = 1; |
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57 } |
| 0 | 58 |
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59 uint8_t* target; |
| 1512 | 60 if (HasPrefixWithUncompressedSize()) |
| 0 | 61 { |
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62 compressed.resize(compressedSize + sizeof(uint64_t)); |
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63 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
| 0 | 64 } |
| 65 else | |
| 66 { | |
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67 compressed.resize(compressedSize); |
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68 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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69 } |
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70 |
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71 int error = compress2(target, |
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72 &compressedSize, |
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73 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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74 uncompressedSize, |
| 1512 | 75 GetCompressionLevel()); |
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76 |
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77 if (error != Z_OK) |
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78 { |
| 0 | 79 compressed.clear(); |
| 80 | |
| 81 switch (error) | |
| 82 { | |
| 83 case Z_MEM_ERROR: | |
| 59 | 84 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 85 |
| 86 default: | |
| 59 | 87 throw OrthancException(ErrorCode_InternalError); |
| 0 | 88 } |
| 89 } | |
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90 |
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91 // The compression was successful |
| 1512 | 92 if (HasPrefixWithUncompressedSize()) |
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93 { |
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94 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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95 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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96 compressed.resize(compressedSize + sizeof(uint64_t)); |
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97 } |
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98 else |
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99 { |
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100 compressed.resize(compressedSize); |
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101 } |
| 0 | 102 } |
| 103 | |
| 104 | |
| 105 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 106 const void* compressed, | |
| 107 size_t compressedSize) | |
| 108 { | |
| 109 if (compressedSize == 0) | |
| 110 { | |
| 111 uncompressed.clear(); | |
| 112 return; | |
| 113 } | |
| 114 | |
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115 if (compressedSize < sizeof(uint64_t)) |
| 0 | 116 { |
| 59 | 117 throw OrthancException("Zlib: The compressed buffer is ill-formed"); |
| 0 | 118 } |
| 119 | |
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120 uint64_t uncompressedSize; |
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121 memcpy(&uncompressedSize, compressed, sizeof(uint64_t)); |
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122 |
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123 try |
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124 { |
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125 uncompressed.resize(uncompressedSize); |
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126 } |
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127 catch (...) |
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128 { |
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129 throw OrthancException("Zlib: Corrupted compressed buffer"); |
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130 } |
| 0 | 131 |
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132 uLongf tmp = uncompressedSize; |
| 0 | 133 int error = uncompress |
| 134 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 135 &tmp, | |
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136 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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137 compressedSize - sizeof(uint64_t)); |
| 0 | 138 |
| 139 if (error != Z_OK) | |
| 140 { | |
| 141 uncompressed.clear(); | |
| 142 | |
| 143 switch (error) | |
| 144 { | |
| 145 case Z_DATA_ERROR: | |
| 59 | 146 throw OrthancException("Zlib: Corrupted or incomplete compressed buffer"); |
| 0 | 147 |
| 148 case Z_MEM_ERROR: | |
| 59 | 149 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 150 |
| 151 default: | |
| 59 | 152 throw OrthancException(ErrorCode_InternalError); |
| 0 | 153 } |
| 154 } | |
| 155 } | |
| 156 } |