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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2022 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include "vfs.h" |
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30 | |
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31 | #include "../../util/util.h" |
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32 | |
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33 | static VFS pg_vfs_class = { |
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34 | pg_vfs_open, |
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35 | pg_vfs_stat, |
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36 | pg_vfs_fstat, |
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37 | pg_vfs_opendir, |
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38 | pg_vfs_fdopendir, |
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39 | pg_vfs_mkdir, |
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40 | pg_vfs_unlink, |
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41 | pg_vfs_rmdir |
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42 | }; |
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43 | |
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44 | static VFS_IO pg_vfs_io_class = { |
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45 | pg_vfs_io_read, |
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46 | pg_vfs_io_write, |
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47 | pg_vfs_io_pread, |
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48 | pg_vfs_io_pwrite, |
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49 | pg_vfs_io_seek, |
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50 | pg_vfs_io_close, |
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51 | NULL, // no pg aio implementation yet |
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52 | NULL |
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53 | }; |
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54 | |
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55 | static VFS_DIRIO pg_vfs_dirio_class = { |
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56 | pg_vfs_dirio_readdir, |
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57 | pg_vfs_dirio_close |
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58 | }; |
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59 | |
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60 | |
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61 | /* |
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62 | * SQL Queries |
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63 | */ |
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64 | |
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65 | // Resolvs a path into resource_id and parent_id |
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66 | // params: $1: path string |
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67 | static const char *sql_resolve_path = |
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68 | "with recursive resolvepath as (\n\ |
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69 | select\n\ |
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70 | resource_id,\n\ |
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71 | parent_id,\n\ |
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72 | iscollection,\n\ |
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73 | regexp_split_to_array($1, '/') as pathelm,\n\ |
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74 | '' as fullpath,\n\ |
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75 | 1 as pathdepth\n\ |
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76 | from Resource\n\ |
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77 | where parent_id is null\n\ |
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78 | union\n\ |
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79 | select\n\ |
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80 | r.resource_id,\n\ |
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81 | r.parent_id,\n\ |
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82 | iscollection,\n\ |
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83 | p.pathelm,\n\ |
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84 | p.fullpath || '/' || r.nodename,\n\ |
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85 | p.pathdepth + 1\n\ |
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86 | from Resource r\n\ |
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87 | inner join resolvepath p on r.parent_id = p.resource_id\n\ |
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88 | where p.pathelm[p.pathdepth+1] = r.nodename\n\ |
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89 | )\ |
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90 | select resource_id, parent_id, fullpath, iscollection from resolvepath\n\ |
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91 | where fullpath = '$1;"; |
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92 | |
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93 | |
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94 | |
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95 | VFS* pg_vfs_create(Session *sn, Request *rq, pblock *pb) { |
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96 | // resourcepool is required |
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97 | char *resource_pool = pblock_findval("resourcepool", pb); |
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98 | if(!resource_pool) { |
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99 | log_ereport(LOG_MISCONFIG, "pg_vfs_create: missing resourcepool parameter"); |
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100 | return NULL; |
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101 | } |
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102 | |
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103 | // get the resource first (most likely to fail due to misconfig) |
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104 | ResourceData *resdata = resourcepool_lookup(sn, rq, resource_pool, 0); |
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105 | if(!resdata) { |
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106 | log_ereport(LOG_MISCONFIG, "postgresql vfs: resource pool %s not found", resource_pool); |
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107 | return NULL; |
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108 | } |
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109 | // resdata will be freed automatically when the request is finished |
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110 | |
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111 | // Create a new VFS object and a separate instance object |
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112 | // VFS contains fptrs that can be copied from pg_vfs_class |
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113 | // instance contains request specific data (PGconn) |
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114 | VFS *vfs = pool_malloc(sn->pool, sizeof(VFS)); |
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115 | if(!vfs) { |
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116 | return NULL; |
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117 | } |
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118 | |
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119 | PgVFS *vfs_priv = pool_malloc(sn->pool, sizeof(PgVFS)); |
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120 | if(!vfs_priv) { |
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121 | pool_free(sn->pool, vfs); |
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122 | return NULL; |
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123 | } |
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124 | |
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125 | memcpy(vfs, &pg_vfs_class, sizeof(VFS)); |
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126 | vfs->flags = 0; |
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127 | vfs->instance = vfs_priv; |
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128 | |
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129 | return vfs; |
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130 | } |
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131 | |
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132 | |
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133 | int pg_resolve_path(VFSContext *ctx, const char *path, int64_t *parent_id, int64_t *resource_id, const char **resource_name, WSBool *iscollection) { |
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134 | // basic path validation |
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135 | if(!path) return 1; |
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136 | size_t pathlen = strlen(path); |
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137 | if(pathlen == 0) return 1; |
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138 | if(path[0] != '/') { |
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139 | return 1; |
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140 | } |
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141 | |
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142 | // get last node of path |
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143 | *resource_name = util_resource_name(path); |
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144 | |
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145 | VFS *vfs = ctx->vfs; |
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146 | PgVFS *pg = vfs->instance; |
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147 | |
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148 | |
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149 | PGresult *result = PQexecParams( |
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150 | pg->connection, |
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151 | sql_resolve_path, |
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152 | 1, // number of parameters |
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153 | NULL, |
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154 | &path, // parameter value |
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155 | NULL, |
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156 | NULL, |
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157 | 0); // 1: result in text format |
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158 | |
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159 | if(!result) return 1; |
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160 | |
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161 | int ret = 1; |
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162 | int nfields = PQnfields(result); |
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163 | int nrows = PQntuples(result); |
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164 | if(nrows == 1 && nfields == 4) { |
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165 | char *resource_id_str = PQgetvalue(result, 0, 0); |
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166 | char *parent_id_str = PQgetvalue(result, 0, 1); |
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167 | char *iscol = PQgetvalue(result, 0, 2); |
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168 | if(resource_id_str && parent_id_str) { |
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169 | if(util_strtoint(resource_id_str, resource_id) && util_strtoint(parent_id_str, parent_id)) { |
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170 | ret = 0; // success |
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171 | } |
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172 | } |
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173 | if(iscol) { |
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174 | *iscollection = iscol[0] == 't' ? TRUE : FALSE; |
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175 | } |
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176 | } else { |
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177 | ctx->vfs_errno = ENOENT; |
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178 | } |
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179 | |
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180 | PQclear(result); |
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181 | |
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182 | return ret; |
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183 | } |
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184 | |
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185 | |
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186 | /* -------------------------- VFS functions -------------------------- */ |
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187 | |
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188 | SYS_FILE pg_vfs_open(VFSContext *ctx, const char *path, int oflags) { |
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189 | const char *resname; |
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190 | int64_t resource_id, parent_id; |
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191 | WSBool iscollection; |
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192 | if(pg_resolve_path(ctx, path, &resource_id, &parent_id, &resname, &iscollection)) { |
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193 | return NULL; |
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194 | } |
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195 | |
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196 | VFSFile *file = pool_malloc(ctx->pool, sizeof(VFSFile)); |
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197 | if(!file) { |
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198 | return NULL; |
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199 | } |
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200 | PgFile *pgfile = pool_malloc(ctx->pool, sizeof(PgFile)); |
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201 | if(!pgfile) { |
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202 | pool_free(ctx->pool, file); |
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203 | return NULL; |
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204 | } |
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205 | |
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206 | pgfile->iscollection = iscollection; |
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207 | pgfile->resource_id = resource_id; |
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208 | pgfile->parent_id = parent_id; |
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209 | |
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210 | file->ctx = ctx; |
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211 | file->io = iscollection ? NULL : &pg_vfs_io_class; |
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212 | file->fd = -1; |
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213 | file->data = pgfile; |
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214 | |
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215 | return file; |
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216 | } |
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217 | |
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218 | int pg_vfs_stat(VFSContext *ctx, const char *path, struct stat *buf) { |
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219 | |
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220 | } |
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221 | |
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222 | int pg_vfs_fstat(VFSContext *ctx, SYS_FILE fd, struct stat *buf) { |
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223 | |
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224 | } |
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225 | |
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226 | VFS_DIR pg_vfs_opendir(VFSContext *ctx, const char *path) { |
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227 | |
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228 | } |
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229 | |
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230 | VFS_DIR pg_vfs_fdopendir(VFSContext *ctx, SYS_FILE fd) { |
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231 | |
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232 | } |
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233 | |
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234 | int pg_vfs_mkdir(VFSContext *ctx, const char *path) { |
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235 | |
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236 | } |
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237 | |
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238 | int pg_vfs_unlink(VFSContext *ctx, const char *path) { |
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239 | |
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240 | } |
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241 | |
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242 | int pg_vfs_rmdir(VFSContext *Ctx, const char *path) { |
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243 | |
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244 | } |
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245 | |
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246 | |
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247 | /* -------------------------- VFS_IO functions -------------------------- */ |
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248 | |
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249 | ssize_t pg_vfs_io_read(SYS_FILE fd, void *buf, size_t nbyte) { |
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250 | |
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251 | } |
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252 | |
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253 | ssize_t pg_vfs_io_write(SYS_FILE fd, const void *buf, size_t nbyte) { |
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254 | |
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255 | } |
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256 | |
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257 | ssize_t pg_vfs_io_pread(SYS_FILE fd, void *buf, size_t nbyte, off_t offset) { |
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258 | |
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259 | } |
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260 | |
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261 | ssize_t pg_vfs_io_pwrite(SYS_FILE fd, const void *buf, size_t nbyte, off_t offset) { |
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262 | |
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263 | } |
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264 | |
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265 | off_t pg_vfs_io_seek(SYS_FILE fd, off_t offset, int whence) { |
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266 | |
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267 | } |
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268 | |
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269 | void pg_vfs_io_close(SYS_FILE fd) { |
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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 | /* -------------------------- VFS_DIRIO functions -------------------------- */ |
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275 | |
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276 | int pg_vfs_dirio_readdir(VFS_DIR dir, VFS_ENTRY *entry, int getstat) { |
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277 | |
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278 | } |
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279 | |
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280 | void pg_vfs_dirio_close(VFS_DIR dir) { |
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281 | |
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282 | } |