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annotate OrthancFramework/Sources/Compression/ZlibCompressor.cpp @ 4544:ae63b301d522 Orthanc-1.7.4
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 02 Mar 2021 16:52:26 +0100 |
| parents | bf7b9edf6b81 |
| children | 3b70a2e6a06c |
| rev | line source |
|---|---|
| 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 | |
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8 * modify it under the terms of the GNU Lesser General Public License |
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9 * as published by the Free Software Foundation, either version 3 of |
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10 * the License, or (at your option) any later version. |
| 136 | 11 * |
| 0 | 12 * This program is distributed in the hope that it will be useful, but |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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15 * Lesser General Public License for more details. |
| 0 | 16 * |
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17 * You should have received a copy of the GNU Lesser General Public |
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18 * License along with this program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
| 0 | 20 **/ |
| 21 | |
| 22 | |
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23 #include "../PrecompiledHeaders.h" |
| 0 | 24 #include "ZlibCompressor.h" |
| 25 | |
| 1513 | 26 #include "../OrthancException.h" |
| 27 #include "../Logging.h" | |
| 28 | |
| 0 | 29 #include <stdio.h> |
| 30 #include <string.h> | |
| 31 #include <zlib.h> | |
| 32 | |
| 59 | 33 namespace Orthanc |
| 0 | 34 { |
| 35 void ZlibCompressor::Compress(std::string& compressed, | |
| 36 const void* uncompressed, | |
| 37 size_t uncompressedSize) | |
| 38 { | |
| 39 if (uncompressedSize == 0) | |
| 40 { | |
| 41 compressed.clear(); | |
| 42 return; | |
| 43 } | |
| 44 | |
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45 uLongf compressedSize = compressBound(static_cast<uLong>(uncompressedSize)) |
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46 + 1024 /* security margin */; |
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47 if (compressedSize == 0) |
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48 { |
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49 compressedSize = 1; |
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50 } |
| 0 | 51 |
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52 uint8_t* target; |
| 1512 | 53 if (HasPrefixWithUncompressedSize()) |
| 0 | 54 { |
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55 compressed.resize(compressedSize + sizeof(uint64_t)); |
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56 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
| 0 | 57 } |
| 58 else | |
| 59 { | |
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60 compressed.resize(compressedSize); |
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61 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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62 } |
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63 |
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64 int error = compress2(target, |
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65 &compressedSize, |
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66 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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67 static_cast<uLong>(uncompressedSize), |
| 1512 | 68 GetCompressionLevel()); |
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69 |
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70 if (error != Z_OK) |
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71 { |
| 0 | 72 compressed.clear(); |
| 73 | |
| 74 switch (error) | |
| 75 { | |
| 76 case Z_MEM_ERROR: | |
| 59 | 77 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 78 |
| 79 default: | |
| 59 | 80 throw OrthancException(ErrorCode_InternalError); |
| 0 | 81 } |
| 82 } | |
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83 |
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84 // The compression was successful |
| 1512 | 85 if (HasPrefixWithUncompressedSize()) |
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86 { |
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87 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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88 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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89 compressed.resize(compressedSize + sizeof(uint64_t)); |
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90 } |
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91 else |
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92 { |
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93 compressed.resize(compressedSize); |
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94 } |
| 0 | 95 } |
| 96 | |
| 97 | |
| 98 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 99 const void* compressed, | |
| 100 size_t compressedSize) | |
| 101 { | |
| 102 if (compressedSize == 0) | |
| 103 { | |
| 104 uncompressed.clear(); | |
| 105 return; | |
| 106 } | |
| 107 | |
| 1513 | 108 if (!HasPrefixWithUncompressedSize()) |
| 0 | 109 { |
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110 throw OrthancException(ErrorCode_InternalError, |
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111 "Cannot guess the uncompressed size of a zlib-encoded buffer"); |
| 0 | 112 } |
| 113 | |
| 1513 | 114 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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115 |
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116 try |
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117 { |
| 1545 | 118 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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119 } |
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120 catch (...) |
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121 { |
| 1513 | 122 throw OrthancException(ErrorCode_NotEnoughMemory); |
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123 } |
| 0 | 124 |
| 1545 | 125 uLongf tmp = static_cast<uLongf>(uncompressedSize); |
| 0 | 126 int error = uncompress |
| 127 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 128 &tmp, | |
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129 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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130 static_cast<uLong>(compressedSize - sizeof(uint64_t))); |
| 0 | 131 |
| 132 if (error != Z_OK) | |
| 133 { | |
| 134 uncompressed.clear(); | |
| 135 | |
| 136 switch (error) | |
| 137 { | |
| 138 case Z_DATA_ERROR: | |
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139 throw OrthancException(ErrorCode_CorruptedFile); |
| 0 | 140 |
| 141 case Z_MEM_ERROR: | |
| 59 | 142 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 143 |
| 144 default: | |
| 59 | 145 throw OrthancException(ErrorCode_InternalError); |
| 0 | 146 } |
| 147 } | |
| 148 } | |
| 149 } |