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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) 2017-2018 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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 // http://www.postgresql.org/docs/9.1/static/lo-interfaces.html#AEN33102
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23
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24 #include "PostgreSQLLargeObject.h"
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25
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26 #include <Core/Logging.h>
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27 #include <Core/OrthancException.h>
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28
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29 #include <boost/lexical_cast.hpp>
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30 #include <libpq/libpq-fs.h>
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31
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32
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33 namespace OrthancDatabases
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34 {
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35 void PostgreSQLLargeObject::Create()
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36 {
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37 PGconn* pg = reinterpret_cast<PGconn*>(database_.pg_);
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38
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39 oid_ = lo_creat(pg, INV_WRITE);
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40 if (oid_ == 0)
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41 {
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42 LOG(ERROR) << "PostgreSQL: Cannot create a large object";
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43 database_.ThrowException(false);
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44 }
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45 }
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46
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47
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48 void PostgreSQLLargeObject::Write(const void* data,
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49 size_t size)
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50 {
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51 static int MAX_CHUNK_SIZE = 16 * 1024 * 1024;
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52
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53 PGconn* pg = reinterpret_cast<PGconn*>(database_.pg_);
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54
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55 int fd = lo_open(pg, oid_, INV_WRITE);
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56 if (fd < 0)
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57 {
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58 database_.ThrowException(true);
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59 }
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60
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61 const char* position = reinterpret_cast<const char*>(data);
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62 while (size > 0)
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63 {
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64 int chunk = (size > static_cast<size_t>(MAX_CHUNK_SIZE) ?
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65 MAX_CHUNK_SIZE : static_cast<int>(size));
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66 int nbytes = lo_write(pg, fd, position, chunk);
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67 if (nbytes <= 0)
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68 {
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69 lo_close(pg, fd);
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70 database_.ThrowException(true);
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71 }
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72
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73 size -= nbytes;
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74 position += nbytes;
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75 }
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76
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77 lo_close(pg, fd);
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78 }
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79
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80
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81 PostgreSQLLargeObject::PostgreSQLLargeObject(PostgreSQLDatabase& database,
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82 const void* data,
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83 size_t size) :
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84 database_(database)
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85 {
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86 Create();
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87 Write(data, size);
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88 }
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89
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90
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91 PostgreSQLLargeObject::PostgreSQLLargeObject(PostgreSQLDatabase& database,
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92 const std::string& s) :
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93 database_(database)
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94 {
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95 Create();
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96
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97 if (s.size() != 0)
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98 {
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99 Write(s.c_str(), s.size());
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100 }
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101 else
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102 {
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103 Write(NULL, 0);
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104 }
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105 }
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106
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107
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108 class PostgreSQLLargeObject::Reader
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109 {
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110 private:
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111 PostgreSQLDatabase& database_;
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112 int fd_;
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113 size_t size_;
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114
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115 public:
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116 Reader(PostgreSQLDatabase& database,
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117 const std::string& oid) :
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118 database_(database)
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119 {
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120 PGconn* pg = reinterpret_cast<PGconn*>(database.pg_);
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121 Oid id = boost::lexical_cast<Oid>(oid);
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122
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123 fd_ = lo_open(pg, id, INV_READ);
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124
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125 if (fd_ < 0 ||
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126 lo_lseek(pg, fd_, 0, SEEK_END) < 0)
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127 {
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128 LOG(ERROR) << "PostgreSQL: No such large object in the database; "
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129 << "Make sure you use a transaction";
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130 database.ThrowException(false);
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131 }
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132
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133 // Get the size of the large object
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134 int size = lo_tell(pg, fd_);
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135 if (size < 0)
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136 {
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137 database.ThrowException(true);
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138 }
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139 size_ = static_cast<size_t>(size);
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140
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141 // Go to the first byte of the object
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142 lo_lseek(pg, fd_, 0, SEEK_SET);
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143 }
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144
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145 ~Reader()
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146 {
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147 lo_close(reinterpret_cast<PGconn*>(database_.pg_), fd_);
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148 }
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149
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150 size_t GetSize() const
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151 {
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152 return size_;
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153 }
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154
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155 void Read(char* target)
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156 {
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157 for (size_t position = 0; position < size_; )
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158 {
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159 size_t remaining = size_ - position;
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160
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161 int nbytes = lo_read(reinterpret_cast<PGconn*>(database_.pg_), fd_, target + position, remaining);
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162 if (nbytes < 0)
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163 {
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164 LOG(ERROR) << "PostgreSQL: Unable to read the large object in the database";
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165 database_.ThrowException(false);
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166 }
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167
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168 position += static_cast<size_t>(nbytes);
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169 }
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170 }
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171 };
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172
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173
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174 void PostgreSQLLargeObject::Read(std::string& target,
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175 PostgreSQLDatabase& database,
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176 const std::string& oid)
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177 {
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178 Reader reader(database, oid);
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179 target.resize(reader.GetSize());
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180
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181 if (target.size() > 0)
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182 {
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183 reader.Read(&target[0]);
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184 }
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185 }
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186
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187
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188 void PostgreSQLLargeObject::Read(void*& target,
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189 size_t& size,
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190 PostgreSQLDatabase& database,
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191 const std::string& oid)
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192 {
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193 Reader reader(database, oid);
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194 size = reader.GetSize();
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195
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196 if (size == 0)
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197 {
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198 target = NULL;
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199 }
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200 else
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201 {
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202 target = malloc(size);
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203 reader.Read(reinterpret_cast<char*>(target));
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204 }
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205 }
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206
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207
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208 std::string PostgreSQLLargeObject::GetOid() const
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209 {
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210 return boost::lexical_cast<std::string>(oid_);
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211 }
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212
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213
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214 void PostgreSQLLargeObject::Delete(PostgreSQLDatabase& database,
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215 const std::string& oid)
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216 {
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217 PGconn* pg = reinterpret_cast<PGconn*>(database.pg_);
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218 Oid id = boost::lexical_cast<Oid>(oid);
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219
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220 if (lo_unlink(pg, id) < 0)
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221 {
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222 LOG(ERROR) << "PostgreSQL: Unable to delete the large object from the database";
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223 database.ThrowException(false);
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224 }
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225 }
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226 }
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