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1 /**
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2 * Palantir - 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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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20
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21 #include "ZlibCompressor.h"
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22
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23 #include <stdio.h>
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24 #include <string.h>
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25 #include <zlib.h>
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26 #include "../PalantirException.h"
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27
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28 namespace Palantir
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29 {
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30 void ZlibCompressor::SetCompressionLevel(uint8_t level)
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31 {
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32 if (level >= 10)
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33 {
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34 throw PalantirException("Zlib compression level must be between 0 (no compression) and 9 (highest compression");
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35 }
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36 }
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37
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38
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39 void ZlibCompressor::Compress(std::string& compressed,
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40 const void* uncompressed,
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41 size_t uncompressedSize)
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42 {
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43 if (uncompressedSize == 0)
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44 {
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45 compressed.clear();
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46 return;
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47 }
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48
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49 uLongf compressedSize = compressBound(uncompressedSize);
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50 compressed.resize(compressedSize + sizeof(size_t));
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51
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52 int error = compress2
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53 (reinterpret_cast<uint8_t*>(&compressed[0]) + sizeof(size_t),
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54 &compressedSize,
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55 const_cast<Bytef *>(static_cast<const Bytef *>(uncompressed)),
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56 uncompressedSize,
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57 compressionLevel_);
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58
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59 memcpy(&compressed[0], &uncompressedSize, sizeof(size_t));
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60
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61 if (error == Z_OK)
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62 {
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63 compressed.resize(compressedSize + sizeof(size_t));
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64 return;
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65 }
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66 else
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67 {
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68 compressed.clear();
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69
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70 switch (error)
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71 {
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72 case Z_MEM_ERROR:
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73 throw PalantirException(ErrorCode_NotEnoughMemory);
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74
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75 default:
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76 throw PalantirException(ErrorCode_InternalError);
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77 }
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78 }
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79 }
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80
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81
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82 void ZlibCompressor::Uncompress(std::string& uncompressed,
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83 const void* compressed,
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84 size_t compressedSize)
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85 {
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86 if (compressedSize == 0)
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87 {
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88 uncompressed.clear();
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89 return;
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90 }
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91
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92 if (compressedSize < sizeof(size_t))
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93 {
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94 throw PalantirException("Zlib: The compressed buffer is ill-formed");
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95 }
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96
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97 size_t uncompressedLength;
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98 memcpy(&uncompressedLength, compressed, sizeof(size_t));
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99 uncompressed.resize(uncompressedLength);
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100
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101 uLongf tmp = uncompressedLength;
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102 int error = uncompress
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103 (reinterpret_cast<uint8_t*>(&uncompressed[0]),
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104 &tmp,
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105 reinterpret_cast<const uint8_t*>(compressed) + sizeof(size_t),
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106 compressedSize - sizeof(size_t));
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107
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108 if (error != Z_OK)
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109 {
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110 uncompressed.clear();
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111
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112 switch (error)
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113 {
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114 case Z_DATA_ERROR:
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115 throw PalantirException("Zlib: Corrupted or incomplete compressed buffer");
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116
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117 case Z_MEM_ERROR:
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118 throw PalantirException(ErrorCode_NotEnoughMemory);
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119
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120 default:
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121 throw PalantirException(ErrorCode_InternalError);
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122 }
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123 }
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124 }
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125 }
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