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comparison Resources/Orthanc/Core/Compression/ZlibCompressor.cpp @ 200:03afbee0cc7b

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integration of Orthanc core into Stone
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 23 Mar 2018 11:04:03 +0100
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199:dabe9982fca3 200:03afbee0cc7b
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
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.
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.
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
34 #include "../PrecompiledHeaders.h"
35 #include "ZlibCompressor.h"
36
37 #include "../OrthancException.h"
38 #include "../Logging.h"
39
40 #include <stdio.h>
41 #include <string.h>
42 #include <zlib.h>
43
44 namespace Orthanc
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
56 uLongf compressedSize = compressBound(uncompressedSize) + 1024 /* security margin */;
57 if (compressedSize == 0)
58 {
59 compressedSize = 1;
60 }
61
62 uint8_t* target;
63 if (HasPrefixWithUncompressedSize())
64 {
65 compressed.resize(compressedSize + sizeof(uint64_t));
66 target = reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(uint64_t);
67 }
68 else
69 {
70 compressed.resize(compressedSize);
71 target = reinterpret_cast<uint8_t*>(&compressed[0]);
72 }
73
74 int error = compress2(target,
75 &compressedSize,
76 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
77 uncompressedSize,
78 GetCompressionLevel());
79
80 if (error != Z_OK)
81 {
82 compressed.clear();
83
84 switch (error)
85 {
86 case Z_MEM_ERROR:
87 throw OrthancException(ErrorCode_NotEnoughMemory);
88
89 default:
90 throw OrthancException(ErrorCode_InternalError);
91 }
92 }
93
94 // The compression was successful
95 if (HasPrefixWithUncompressedSize())
96 {
97 uint64_t s = static_cast<uint64_t>(uncompressedSize);
98 memcpy(&compressed[0], &s, sizeof(uint64_t));
99 compressed.resize(compressedSize + sizeof(uint64_t));
100 }
101 else
102 {
103 compressed.resize(compressedSize);
104 }
105 }
106
107
108 void ZlibCompressor::Uncompress(std::string& uncompressed,
109 const void* compressed,
110 size_t compressedSize)
111 {
112 if (compressedSize == 0)
113 {
114 uncompressed.clear();
115 return;
116 }
117
118 if (!HasPrefixWithUncompressedSize())
119 {
120 LOG(ERROR) << "Cannot guess the uncompressed size of a zlib-encoded buffer";
121 throw OrthancException(ErrorCode_InternalError);
122 }
123
124 uint64_t uncompressedSize = ReadUncompressedSizePrefix(compressed, compressedSize);
125
126 try
127 {
128 uncompressed.resize(static_cast<size_t>(uncompressedSize));
129 }
130 catch (...)
131 {
132 throw OrthancException(ErrorCode_NotEnoughMemory);
133 }
134
135 uLongf tmp = static_cast<uLongf>(uncompressedSize);
136 int error = uncompress
137 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
138 &tmp,
139 reinterpret_cast<const uint8_t*>(compressed) + sizeof(uint64_t),
140 compressedSize - sizeof(uint64_t));
141
142 if (error != Z_OK)
143 {
144 uncompressed.clear();
145
146 switch (error)
147 {
148 case Z_DATA_ERROR:
149 throw OrthancException(ErrorCode_CorruptedFile);
150
151 case Z_MEM_ERROR:
152 throw OrthancException(ErrorCode_NotEnoughMemory);
153
154 default:
155 throw OrthancException(ErrorCode_InternalError);
156 }
157 }
158 }
159 }