Mercurial > hg > orthanc
annotate Core/Compression/ZlibCompressor.cpp @ 2163:6a2374a974cd
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 22 Nov 2016 11:40:05 +0100 |
parents | b1291df2f780 |
children | a3a65de1840f |
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 |
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 | |
1513 | 36 #include "../OrthancException.h" |
37 #include "../Logging.h" | |
38 | |
0 | 39 #include <stdio.h> |
40 #include <string.h> | |
41 #include <zlib.h> | |
42 | |
59 | 43 namespace Orthanc |
0 | 44 { |
45 void ZlibCompressor::Compress(std::string& compressed, | |
46 const void* uncompressed, | |
47 size_t uncompressedSize) | |
48 { | |
49 if (uncompressedSize == 0) | |
50 { | |
51 compressed.clear(); | |
52 return; | |
53 } | |
54 | |
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55 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */; |
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56 if (compressedSize == 0) |
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57 { |
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58 compressedSize = 1; |
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59 } |
0 | 60 |
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61 uint8_t* target; |
1512 | 62 if (HasPrefixWithUncompressedSize()) |
0 | 63 { |
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64 compressed.resize(compressedSize + sizeof(uint64_t)); |
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65 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t); |
0 | 66 } |
67 else | |
68 { | |
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69 compressed.resize(compressedSize); |
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70 target = reinterpret_cast<uint8_t*>(&compressed[0]); |
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71 } |
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72 |
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73 int error = compress2(target, |
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74 &compressedSize, |
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75 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), |
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76 uncompressedSize, |
1512 | 77 GetCompressionLevel()); |
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78 |
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79 if (error != Z_OK) |
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80 { |
0 | 81 compressed.clear(); |
82 | |
83 switch (error) | |
84 { | |
85 case Z_MEM_ERROR: | |
59 | 86 throw OrthancException(ErrorCode_NotEnoughMemory); |
0 | 87 |
88 default: | |
59 | 89 throw OrthancException(ErrorCode_InternalError); |
0 | 90 } |
91 } | |
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92 |
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93 // The compression was successful |
1512 | 94 if (HasPrefixWithUncompressedSize()) |
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95 { |
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96 uint64_t s = static_cast<uint64_t>(uncompressedSize); |
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97 memcpy(&compressed[0], &s, sizeof(uint64_t)); |
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98 compressed.resize(compressedSize + sizeof(uint64_t)); |
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99 } |
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100 else |
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101 { |
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102 compressed.resize(compressedSize); |
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103 } |
0 | 104 } |
105 | |
106 | |
107 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
108 const void* compressed, | |
109 size_t compressedSize) | |
110 { | |
111 if (compressedSize == 0) | |
112 { | |
113 uncompressed.clear(); | |
114 return; | |
115 } | |
116 | |
1513 | 117 if (!HasPrefixWithUncompressedSize()) |
0 | 118 { |
1513 | 119 LOG(ERROR) << "Cannot guess the uncompressed size of a zlib-encoded buffer"; |
120 throw OrthancException(ErrorCode_InternalError); | |
0 | 121 } |
122 | |
1513 | 123 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize); |
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124 |
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125 try |
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126 { |
1545 | 127 uncompressed.resize(static_cast<size_t>(uncompressedSize)); |
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128 } |
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129 catch (...) |
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130 { |
1513 | 131 throw OrthancException(ErrorCode_NotEnoughMemory); |
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132 } |
0 | 133 |
1545 | 134 uLongf tmp = static_cast<uLongf>(uncompressedSize); |
0 | 135 int error = uncompress |
136 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
137 &tmp, | |
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138 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t), |
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139 compressedSize - sizeof(uint64_t)); |
0 | 140 |
141 if (error != Z_OK) | |
142 { | |
143 uncompressed.clear(); | |
144 | |
145 switch (error) | |
146 { | |
147 case Z_DATA_ERROR: | |
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148 throw OrthancException(ErrorCode_CorruptedFile); |
0 | 149 |
150 case Z_MEM_ERROR: | |
59 | 151 throw OrthancException(ErrorCode_NotEnoughMemory); |
0 | 152 |
153 default: | |
59 | 154 throw OrthancException(ErrorCode_InternalError); |
0 | 155 } |
156 } | |
157 } | |
158 } |