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annotate Core/Compression/ZlibCompressor.cpp @ 1410:8146fcd7d8af
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 03 Jun 2015 13:44:41 +0200 |
| parents | 6e7e5ed91c2d |
| children | 7962563129c9 |
| 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::SetCompressionLevel(uint8_t level) | |
| 44 { | |
| 45 if (level >= 10) | |
| 46 { | |
| 59 | 47 throw OrthancException("Zlib compression level must be between 0 (no compression) and 9 (highest compression"); |
| 0 | 48 } |
| 81 | 49 |
| 50 compressionLevel_ = level; | |
| 0 | 51 } |
| 52 | |
| 53 | |
| 54 void ZlibCompressor::Compress(std::string& compressed, | |
| 55 const void* uncompressed, | |
| 56 size_t uncompressedSize) | |
| 57 { | |
| 58 if (uncompressedSize == 0) | |
| 59 { | |
| 60 compressed.clear(); | |
| 61 return; | |
| 62 } | |
| 63 | |
| 64 uLongf compressedSize = compressBound(uncompressedSize); | |
| 65 compressed.resize(compressedSize + sizeof(size_t)); | |
| 66 | |
| 67 int error = compress2 | |
| 68 (reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(size_t), | |
| 69 &compressedSize, | |
| 70 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)), | |
| 71 uncompressedSize, | |
| 72 compressionLevel_); | |
| 73 | |
| 74 memcpy(&compressed[0], &uncompressedSize, sizeof(size_t)); | |
| 75 | |
| 76 if (error == Z_OK) | |
| 77 { | |
| 78 compressed.resize(compressedSize + sizeof(size_t)); | |
| 79 return; | |
| 80 } | |
| 81 else | |
| 82 { | |
| 83 compressed.clear(); | |
| 84 | |
| 85 switch (error) | |
| 86 { | |
| 87 case Z_MEM_ERROR: | |
| 59 | 88 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 89 |
| 90 default: | |
| 59 | 91 throw OrthancException(ErrorCode_InternalError); |
| 0 | 92 } |
| 93 } | |
| 94 } | |
| 95 | |
| 96 | |
| 97 void ZlibCompressor::Uncompress(std::string& uncompressed, | |
| 98 const void* compressed, | |
| 99 size_t compressedSize) | |
| 100 { | |
| 101 if (compressedSize == 0) | |
| 102 { | |
| 103 uncompressed.clear(); | |
| 104 return; | |
| 105 } | |
| 106 | |
| 107 if (compressedSize < sizeof(size_t)) | |
| 108 { | |
| 59 | 109 throw OrthancException("Zlib: The compressed buffer is ill-formed"); |
| 0 | 110 } |
| 111 | |
| 112 size_t uncompressedLength; | |
| 113 memcpy(&uncompressedLength, compressed, sizeof(size_t)); | |
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114 |
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115 try |
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116 { |
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117 uncompressed.resize(uncompressedLength); |
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118 } |
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119 catch (...) |
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120 { |
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121 throw OrthancException("Zlib: Corrupted compressed buffer"); |
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122 } |
| 0 | 123 |
| 124 uLongf tmp = uncompressedLength; | |
| 125 int error = uncompress | |
| 126 (reinterpret_cast<uint8_t*>(&uncompressed[0]), | |
| 127 &tmp, | |
| 128 reinterpret_cast<const uint8_t*>(compressed) + sizeof(size_t), | |
| 129 compressedSize - sizeof(size_t)); | |
| 130 | |
| 131 if (error != Z_OK) | |
| 132 { | |
| 133 uncompressed.clear(); | |
| 134 | |
| 135 switch (error) | |
| 136 { | |
| 137 case Z_DATA_ERROR: | |
| 59 | 138 throw OrthancException("Zlib: Corrupted or incomplete compressed buffer"); |
| 0 | 139 |
| 140 case Z_MEM_ERROR: | |
| 59 | 141 throw OrthancException(ErrorCode_NotEnoughMemory); |
| 0 | 142 |
| 143 default: | |
| 59 | 144 throw OrthancException(ErrorCode_InternalError); |
| 0 | 145 } |
| 146 } | |
| 147 } | |
| 148 } |