Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 5858:66fd63b8601e find-refactoring tip
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| author | Alain Mazy <am@orthanc.team> |
|---|---|
| date | Mon, 04 Nov 2024 22:34:14 +0100 |
| parents | f7adfb22e20e |
| 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) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium |
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 0 | 8 * |
| 9 * This program is free software: you can redistribute it and/or | |
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10 * modify it under the terms of the GNU Lesser General Public License |
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11 * as published by the Free Software Foundation, either version 3 of |
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12 * the License, or (at your option) any later version. |
| 136 | 13 * |
| 0 | 14 * This program is distributed in the hope that it will be useful, but |
| 15 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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17 * Lesser General Public License for more details. |
| 0 | 18 * |
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19 * You should have received a copy of the GNU Lesser General Public |
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20 * License along with this program. If not, see |
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21 * <http://www.gnu.org/licenses/>. |
| 0 | 22 **/ |
| 23 | |
| 24 | |
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25 #include "../PrecompiledHeaders.h" |
| 0 | 26 #include "ZlibCompressor.h" |
| 27 | |
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28 #include "../Endianness.h" |
| 1513 | 29 #include "../OrthancException.h" |
| 30 #include "../Logging.h" | |
| 31 | |
| 0 | 32 #include <stdio.h> |
| 33 #include <string.h> | |
| 34 #include <zlib.h> | |
| 35 | |
| 59 | 36 namespace Orthanc |
| 0 | 37 { |
| 4297 | 38 ZlibCompressor::ZlibCompressor() |
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39 { |
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40 SetPrefixWithUncompressedSize(true); |
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41 } |
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42 |
| 0 | 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(static_cast<uLong>(uncompressedSize)) |
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54 + 1024 /* security margin */; |
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55 if (compressedSize == 0) |
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56 { |
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57 compressedSize = 1; |
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58 } |
| 0 | 59 |
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60 uint8_t* target; |
| 1512 | 61 if (HasPrefixWithUncompressedSize()) |
| 0 | 62 { |
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63 compressed.resize(compressedSize + sizeof(uint64_t)); |
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64 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
| 0 | 65 } |
| 66 else | |
| 67 { | |
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68 compressed.resize(compressedSize); |
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69 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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70 } |
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71 |
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72 int error = compress2(target, |
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73 &compressedSize, |
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74 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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75 static_cast<uLong>(uncompressedSize), |
| 1512 | 76 GetCompressionLevel()); |
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77 |
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78 if (error != Z_OK) |
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79 { |
| 0 | 80 compressed.clear(); |
| 81 | |
| 82 switch (error) | |
| 83 { | |
| 84 case Z_MEM_ERROR: | |
| 59 | 85 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 86 |
| 87 default: | |
| 59 | 88 throw OrthancException(ErrorCode_InternalError); |
| 0 | 89 } |
| 90 } | |
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91 |
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92 // The compression was successful |
| 1512 | 93 if (HasPrefixWithUncompressedSize()) |
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94 { |
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95 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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96 |
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97 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix |
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98 s = htole64(s); |
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99 |
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100 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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101 compressed.resize(compressedSize + sizeof(uint64_t)); |
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102 } |
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103 else |
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104 { |
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105 compressed.resize(compressedSize); |
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106 } |
| 0 | 107 } |
| 108 | |
| 109 | |
| 110 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 111 const void* compressed, | |
| 112 size_t compressedSize) | |
| 113 { | |
| 114 if (compressedSize == 0) | |
| 115 { | |
| 116 uncompressed.clear(); | |
| 117 return; | |
| 118 } | |
| 119 | |
| 1513 | 120 if (!HasPrefixWithUncompressedSize()) |
| 0 | 121 { |
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122 throw OrthancException(ErrorCode_InternalError, |
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123 "Cannot guess the uncompressed size of a zlib-encoded buffer"); |
| 0 | 124 } |
| 125 | |
| 1513 | 126 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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127 |
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128 // New in Orthanc 1.9.0: Explicitly use litte-endian encoding in size prefix |
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129 uncompressedSize = le64toh(uncompressedSize); |
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130 |
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131 try |
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132 { |
| 1545 | 133 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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134 } |
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135 catch (...) |
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136 { |
| 1513 | 137 throw OrthancException(ErrorCode_NotEnoughMemory); |
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138 } |
| 0 | 139 |
| 1545 | 140 uLongf tmp = static_cast<uLongf>(uncompressedSize); |
| 0 | 141 int error = uncompress |
| 142 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 143 &tmp, | |
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144 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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145 static_cast<uLong>(compressedSize - sizeof(uint64_t))); |
| 0 | 146 |
| 147 if (error != Z_OK) | |
| 148 { | |
| 149 uncompressed.clear(); | |
| 150 | |
| 151 switch (error) | |
| 152 { | |
| 153 case Z_DATA_ERROR: | |
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154 throw OrthancException(ErrorCode_CorruptedFile); |
| 0 | 155 |
| 156 case Z_MEM_ERROR: | |
| 59 | 157 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 158 |
| 159 default: | |
| 59 | 160 throw OrthancException(ErrorCode_InternalError); |
| 0 | 161 } |
| 162 } | |
| 163 } | |
| 164 } |