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1 /**
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59
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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136
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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0
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "ZlibCompressor.h"
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34
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35 #include <stdio.h>
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36 #include <string.h>
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37 #include <zlib.h>
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59
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38 #include "../OrthancException.h"
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0
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39
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40 namespace Orthanc
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0
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41 {
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42 void ZlibCompressor::SetCompressionLevel(uint8_t level)
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43 {
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44 if (level >= 10)
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45 {
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46 throw OrthancException("Zlib compression level must be between 0 (no compression) and 9 (highest compression");
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0
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47 }
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81
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48
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49 compressionLevel_ = level;
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0
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50 }
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51
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52
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53 void ZlibCompressor::Compress(std::string& compressed,
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54 const void* uncompressed,
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55 size_t uncompressedSize)
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56 {
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57 if (uncompressedSize == 0)
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58 {
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59 compressed.clear();
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60 return;
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61 }
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62
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63 uLongf compressedSize = compressBound(uncompressedSize);
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64 compressed.resize(compressedSize + sizeof(size_t));
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65
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66 int error = compress2
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67 (reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(size_t),
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68 &compressedSize,
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69 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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70 uncompressedSize,
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71 compressionLevel_);
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72
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73 memcpy(&compressed[0], &uncompressedSize, sizeof(size_t));
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74
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75 if (error == Z_OK)
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76 {
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77 compressed.resize(compressedSize + sizeof(size_t));
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78 return;
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79 }
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80 else
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81 {
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82 compressed.clear();
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83
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84 switch (error)
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85 {
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86 case Z_MEM_ERROR:
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87 throw OrthancException(ErrorCode_NotEnoughMemory);
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0
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88
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89 default:
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90 throw OrthancException(ErrorCode_InternalError);
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0
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91 }
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92 }
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93 }
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94
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95
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96 void ZlibCompressor::Uncompress(std::string& uncompressed,
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97 const void* compressed,
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98 size_t compressedSize)
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99 {
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100 if (compressedSize == 0)
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101 {
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102 uncompressed.clear();
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103 return;
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104 }
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105
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106 if (compressedSize < sizeof(size_t))
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107 {
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108 throw OrthancException("Zlib: The compressed buffer is ill-formed");
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0
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109 }
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110
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111 size_t uncompressedLength;
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112 memcpy(&uncompressedLength, compressed, sizeof(size_t));
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113 uncompressed.resize(uncompressedLength);
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114
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115 uLongf tmp = uncompressedLength;
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116 int error = uncompress
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117 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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118 &tmp,
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119 reinterpret_cast<const uint8_t*>(compressed) + sizeof(size_t),
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120 compressedSize - sizeof(size_t));
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121
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122 if (error != Z_OK)
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123 {
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124 uncompressed.clear();
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125
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126 switch (error)
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127 {
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128 case Z_DATA_ERROR:
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129 throw OrthancException("Zlib: Corrupted or incomplete compressed buffer");
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0
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130
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131 case Z_MEM_ERROR:
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132 throw OrthancException(ErrorCode_NotEnoughMemory);
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0
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133
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134 default:
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135 throw OrthancException(ErrorCode_InternalError);
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136 }
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137 }
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138 }
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139 }
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