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4355
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24
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25 #ifndef NOMINMAX
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26 #define NOMINMAX
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27 #endif
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28
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29 #include "ZipReader.h"
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30
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31 #include "../OrthancException.h"
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32 #include "../../Resources/ThirdParty/minizip/unzip.h"
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33
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34 #if ORTHANC_SANDBOXED != 1
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35 # include "../SystemToolbox.h"
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36 #endif
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37
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38 #include <string.h>
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39
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40
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41 namespace Orthanc
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42 {
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43 // ZPOS64_T corresponds to "uint64_t"
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44
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45 class ZipReader::MemoryBuffer : public boost::noncopyable
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46 {
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47 private:
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48 const uint8_t* content_;
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49 size_t size_;
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50 size_t pos_;
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51
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52 public:
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53 MemoryBuffer(const void* p,
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54 size_t size) :
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55 content_(reinterpret_cast<const uint8_t*>(p)),
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56 size_(size),
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57 pos_(0)
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58 {
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59 }
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60
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61 MemoryBuffer(const std::string& s) :
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62 content_(s.empty() ? NULL : reinterpret_cast<const uint8_t*>(s.c_str())),
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63 size_(s.size()),
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64 pos_(0)
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65 {
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66 }
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67
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68 // Returns the number of bytes actually read
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69 uLong Read(void *target,
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70 uLong size)
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71 {
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72 if (size <= 0)
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73 {
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74 return 0;
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75 }
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76 else
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77 {
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78 size_t s = static_cast<size_t>(size);
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79 if (s + pos_ > size_)
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80 {
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81 s = size_ - pos_;
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82 }
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83
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84 if (s != 0)
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85 {
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86 memcpy(target, content_ + pos_, s);
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87 }
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88
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89 pos_ += s;
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90 return s;
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91 }
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92 }
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93
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94 ZPOS64_T Tell() const
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95 {
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96 return static_cast<ZPOS64_T>(pos_);
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97 }
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98
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99 long Seek(ZPOS64_T offset,
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100 int origin)
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101 {
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102 ssize_t next;
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103
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104 switch (origin)
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105 {
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106 case ZLIB_FILEFUNC_SEEK_CUR:
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107 next = static_cast<ssize_t>(offset) + static_cast<ssize_t>(pos_);
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108 break;
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109
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110 case ZLIB_FILEFUNC_SEEK_SET:
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111 next = static_cast<ssize_t>(offset);
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112 break;
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113
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114 case ZLIB_FILEFUNC_SEEK_END:
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115 next = static_cast<ssize_t>(offset) + static_cast<ssize_t>(size_);
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116 break;
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117
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118 default: // Should never occur
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119 return 1; // Error
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120 }
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121
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122 if (next < 0)
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123 {
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124 pos_ = 0;
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125 }
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126 else if (next >= static_cast<long>(size_))
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127 {
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128 pos_ = size_;
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129 }
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130 else
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131 {
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132 pos_ = static_cast<long>(next);
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133 }
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134
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135 return 0;
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136 }
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137
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138
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139 static voidpf OpenWrapper(voidpf opaque,
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140 const void* filename,
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141 int mode)
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142 {
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143 // Don't return NULL to make "unzip.c" happy
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144 return opaque;
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145 }
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146
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147 static uLong ReadWrapper(voidpf opaque,
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148 voidpf stream,
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149 void* buf,
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150 uLong size)
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151 {
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152 assert(opaque != NULL);
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153 return reinterpret_cast<MemoryBuffer*>(opaque)->Read(buf, size);
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154 }
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155
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156 static ZPOS64_T TellWrapper(voidpf opaque,
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157 voidpf stream)
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158 {
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159 assert(opaque != NULL);
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160 return reinterpret_cast<MemoryBuffer*>(opaque)->Tell();
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161 }
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162
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163 static long SeekWrapper(voidpf opaque,
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164 voidpf stream,
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165 ZPOS64_T offset,
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166 int origin)
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167 {
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168 assert(opaque != NULL);
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169 return reinterpret_cast<MemoryBuffer*>(opaque)->Seek(offset, origin);
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170 }
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171
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172 static int CloseWrapper(voidpf opaque,
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173 voidpf stream)
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174 {
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175 return 0;
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176 }
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177
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178 static int TestErrorWrapper(voidpf opaque,
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179 voidpf stream)
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180 {
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181 return 0; // ??
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182 }
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183 };
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184
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185
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186
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187 ZipReader* ZipReader::CreateFromMemory(const std::string& buffer)
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188 {
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189 if (buffer.empty())
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190 {
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191 return CreateFromMemory(NULL, 0);
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192 }
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193 else
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194 {
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195 return CreateFromMemory(buffer.c_str(), buffer.size());
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196 }
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197 }
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198
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199
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200 bool ZipReader::IsZipMemoryBuffer(const void* buffer,
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201 size_t size)
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202 {
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203 if (size < 4)
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204 {
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205 return false;
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206 }
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207 else
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208 {
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209 const uint8_t* c = reinterpret_cast<const uint8_t*>(buffer);
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210 return (c[0] == 0x50 && // 'P'
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211 c[1] == 0x4b && // 'K'
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212 ((c[2] == 0x03 && c[3] == 0x04) ||
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213 (c[2] == 0x05 && c[3] == 0x06) ||
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214 (c[2] == 0x07 && c[3] == 0x08)));
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215 }
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216 }
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217
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218
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219 bool ZipReader::IsZipMemoryBuffer(const std::string& content)
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220 {
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221 if (content.empty())
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222 {
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223 return false;
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224 }
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225 else
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226 {
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227 return IsZipMemoryBuffer(content.c_str(), content.size());
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228 }
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229 }
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230
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231
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232 #if ORTHANC_SANDBOXED != 1
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233 bool ZipReader::IsZipFile(const std::string& path)
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234 {
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235 std::string content;
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236 SystemToolbox::ReadFileRange(content, path, 0, 4,
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237 false /* don't throw if file is too small */);
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238
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239 return IsZipMemoryBuffer(content);
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240 }
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241 #endif
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242
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243
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244 struct ZipReader::PImpl
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245 {
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246 unzFile unzip_;
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247 std::unique_ptr<MemoryBuffer> reader_;
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248 bool done_;
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249
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250 PImpl() :
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251 unzip_(NULL),
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252 done_(true)
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253 {
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254 }
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255 };
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256
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257
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258 ZipReader::ZipReader() :
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259 pimpl_(new PImpl)
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260 {
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261 }
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262
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263
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264 ZipReader::~ZipReader()
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265 {
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266 if (pimpl_->unzip_ != NULL)
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267 {
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268 unzClose(pimpl_->unzip_);
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269 pimpl_->unzip_ = NULL;
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270 }
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271 }
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272
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273
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274 uint64_t ZipReader::GetFilesCount() const
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275 {
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276 assert(pimpl_->unzip_ != NULL);
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277
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278 unz_global_info64_s info;
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279
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280 if (unzGetGlobalInfo64(pimpl_->unzip_, &info) == 0)
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281 {
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282 return info.number_entry;
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283 }
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284 else
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285 {
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286 throw OrthancException(ErrorCode_BadFileFormat);
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287 }
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288 }
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289
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290
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291 void ZipReader::SeekFirst()
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292 {
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293 assert(pimpl_->unzip_ != NULL);
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294 pimpl_->done_ = (unzGoToFirstFile(pimpl_->unzip_) != 0);
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295 }
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296
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297
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298 bool ZipReader::ReadNextFile(std::string& filename,
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299 std::string& content)
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300 {
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301 assert(pimpl_->unzip_ != NULL);
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302
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303 if (pimpl_->done_)
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304 {
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305 return false;
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306 }
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307 else
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308 {
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309 unz_file_info64_s info;
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310 if (unzGetCurrentFileInfo64(pimpl_->unzip_, &info, NULL, 0, NULL, 0, NULL, 0) != 0)
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311 {
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312 throw OrthancException(ErrorCode_BadFileFormat);
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313 }
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314
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315 filename.resize(info.size_filename);
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316 if (!filename.empty() &&
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317 unzGetCurrentFileInfo64(pimpl_->unzip_, &info, &filename[0], filename.size(), NULL, 0, NULL, 0) != 0)
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318 {
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319 throw OrthancException(ErrorCode_BadFileFormat);
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320 }
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321
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322 content.resize(info.uncompressed_size);
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323
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324 if (!content.empty())
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325 {
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326 if (unzOpenCurrentFile(pimpl_->unzip_) == 0)
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327 {
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328 bool success = (unzReadCurrentFile(pimpl_->unzip_, &content[0], content.size()) != 0);
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329
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330 if (unzCloseCurrentFile(pimpl_->unzip_) != 0 ||
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331 !success)
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332 {
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333 throw OrthancException(ErrorCode_BadFileFormat);
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334 }
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335 }
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336 else
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337 {
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338 throw OrthancException(ErrorCode_BadFileFormat);
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339 }
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340 }
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341
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342 pimpl_->done_ = (unzGoToNextFile(pimpl_->unzip_) != 0);
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343
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344 return true;
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345 }
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346 }
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347
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348
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349 ZipReader* ZipReader::CreateFromMemory(const void* buffer,
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350 size_t size)
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351 {
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352 if (!IsZipMemoryBuffer(buffer, size))
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353 {
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354 throw OrthancException(ErrorCode_BadFileFormat, "The memory buffer doesn't contain a ZIP archive");
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355 }
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356 else
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357 {
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358 std::unique_ptr<ZipReader> reader(new ZipReader);
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359
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360 reader->pimpl_->reader_.reset(new MemoryBuffer(buffer, size));
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361 if (reader->pimpl_->reader_.get() == NULL)
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362 {
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363 throw OrthancException(ErrorCode_InternalError);
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364 }
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365
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366 zlib_filefunc64_def funcs;
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367 memset(&funcs, 0, sizeof(funcs));
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368
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369 funcs.opaque = reader->pimpl_->reader_.get();
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370 funcs.zopen64_file = MemoryBuffer::OpenWrapper;
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371 funcs.zread_file = MemoryBuffer::ReadWrapper;
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372 funcs.ztell64_file = MemoryBuffer::TellWrapper;
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373 funcs.zseek64_file = MemoryBuffer::SeekWrapper;
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374 funcs.zclose_file = MemoryBuffer::CloseWrapper;
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375 funcs.zerror_file = MemoryBuffer::TestErrorWrapper;
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376
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377 reader->pimpl_->unzip_ = unzOpen2_64(NULL, &funcs);
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378 if (reader->pimpl_->unzip_ == NULL)
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379 {
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380 throw OrthancException(ErrorCode_BadFileFormat, "Cannot open ZIP archive from memory buffer");
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381 }
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382 else
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383 {
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384 reader->SeekFirst();
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385 return reader.release();
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386 }
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387 }
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388 }
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389
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390
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391 #if ORTHANC_SANDBOXED != 1
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392 ZipReader* ZipReader::CreateFromFile(const std::string& path)
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393 {
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394 if (!IsZipFile(path))
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395 {
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396 throw OrthancException(ErrorCode_BadFileFormat, "The file doesn't contain a ZIP archive: " + path);
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397 }
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398 else
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399 {
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400 std::unique_ptr<ZipReader> reader(new ZipReader);
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401
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402 reader->pimpl_->unzip_ = unzOpen64(path.c_str());
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403 if (reader->pimpl_->unzip_ == NULL)
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404 {
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405 throw OrthancException(ErrorCode_BadFileFormat, "Cannot open ZIP archive from file: " + path);
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406 }
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407 else
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408 {
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409 reader->SeekFirst();
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410 return reader.release();
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411 }
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412 }
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413 }
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414 #endif
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415 }
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