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1 /* -*- mode: C; c-file-style: "gnu" -*- */ |
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2 /* dbus-gloader-expat.c expat XML loader |
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3 * |
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4 * Copyright (C) 2003 Red Hat, Inc. |
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5 * |
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6 * Licensed under the Academic Free License version 2.1 |
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7 * |
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8 * This program is free software; you can redistribute it and/or modify |
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9 * it under the terms of the GNU General Public License as published by |
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10 * the Free Software Foundation; either version 2 of the License, or |
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11 * (at your option) any later version. |
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12 * |
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13 * This program is distributed in the hope that it will be useful, |
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 * GNU General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU General Public License |
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19 * along with this program; if not, write to the Free Software |
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20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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21 * |
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22 */ |
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23 |
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24 #include "dbus-gparser.h" |
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25 #include <expat.h> |
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26 #include <string.h> |
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27 |
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28 static void* |
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29 expat_g_malloc (size_t sz) |
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30 { |
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31 return g_malloc (sz); |
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32 } |
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33 |
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34 static void* |
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35 expat_g_realloc (void *mem, size_t sz) |
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36 { |
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37 return g_realloc (mem, sz); |
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38 } |
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39 |
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40 static XML_Memory_Handling_Suite memsuite = |
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41 { |
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42 expat_g_malloc, |
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43 expat_g_realloc, |
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44 g_free |
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45 }; |
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46 |
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47 /** |
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48 * Context for Expat parser for introspection data. |
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49 */ |
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50 typedef struct |
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51 { |
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52 Parser *parser; /**< The parser for the introspection data */ |
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53 const char *filename; /**< The filename being loaded */ |
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54 GString *content; /**< The content of the current element */ |
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55 GError **error; /**< Error return location */ |
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56 gboolean failed; /**< True if parse has failed */ |
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57 } ExpatParseContext; |
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58 |
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59 static dbus_bool_t |
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60 process_content (ExpatParseContext *context) |
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61 { |
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62 if (context->failed) |
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63 return FALSE; |
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64 |
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65 if (context->content->len > 0) |
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66 { |
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67 if (!parser_content (context->parser, |
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68 context->content->str, |
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69 context->content->len, |
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70 context->error)) |
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71 { |
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72 context->failed = TRUE; |
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73 return FALSE; |
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74 } |
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75 g_string_set_size (context->content, 0); |
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76 } |
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77 |
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78 return TRUE; |
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79 } |
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80 |
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81 static void |
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82 expat_StartElementHandler (void *userData, |
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83 const XML_Char *name, |
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84 const XML_Char **atts) |
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85 { |
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86 ExpatParseContext *context = userData; |
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87 int i; |
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88 char **names; |
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89 char **values; |
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90 |
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91 /* Expat seems to suck and can't abort the parse if we |
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92 * throw an error. Expat 2.0 is supposed to fix this. |
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93 */ |
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94 if (context->failed) |
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95 return; |
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96 |
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97 if (!process_content (context)) |
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98 return; |
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99 |
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100 /* "atts" is key, value, key, value, NULL */ |
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101 for (i = 0; atts[i] != NULL; ++i) |
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102 ; /* nothing */ |
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103 |
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104 g_assert (i % 2 == 0); |
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105 names = g_new0 (char *, i / 2 + 1); |
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106 values = g_new0 (char *, i / 2 + 1); |
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107 |
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108 i = 0; |
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109 while (atts[i] != NULL) |
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110 { |
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111 g_assert (i % 2 == 0); |
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112 names [i / 2] = (char*) atts[i]; |
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113 values[i / 2] = (char*) atts[i+1]; |
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114 |
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115 i += 2; |
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116 } |
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117 |
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118 if (!parser_start_element (context->parser, |
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119 name, |
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120 (const char **) names, |
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121 (const char **) values, |
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122 context->error)) |
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123 { |
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124 g_free (names); |
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125 g_free (values); |
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126 context->failed = TRUE; |
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127 return; |
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128 } |
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129 |
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130 g_free (names); |
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131 g_free (values); |
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132 } |
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133 |
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134 static void |
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135 expat_EndElementHandler (void *userData, |
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136 const XML_Char *name) |
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137 { |
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138 ExpatParseContext *context = userData; |
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139 |
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140 if (!process_content (context)) |
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141 return; |
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142 |
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143 if (!parser_end_element (context->parser, |
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144 name, |
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145 context->error)) |
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146 { |
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147 context->failed = TRUE; |
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148 return; |
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149 } |
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150 } |
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151 |
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152 /* s is not 0 terminated. */ |
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153 static void |
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154 expat_CharacterDataHandler (void *userData, |
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155 const XML_Char *s, |
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156 int len) |
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157 { |
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158 ExpatParseContext *context = userData; |
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159 |
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160 if (context->failed) |
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161 return; |
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162 |
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163 g_string_append_len (context->content, |
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164 s, len); |
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165 } |
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166 |
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167 NodeInfo* |
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168 description_load_from_file (const char *filename, |
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169 GError **error) |
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170 { |
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171 char *contents; |
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172 gsize len; |
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173 NodeInfo *nodes; |
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174 |
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175 contents = NULL; |
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176 if (!g_file_get_contents (filename, &contents, &len, error)) |
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177 return NULL; |
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178 |
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179 nodes = description_load_from_string (contents, len, error); |
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180 g_free (contents); |
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181 |
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182 return nodes; |
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183 } |
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184 |
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185 NodeInfo* |
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186 description_load_from_string (const char *str, |
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187 int len, |
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188 GError **error) |
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189 { |
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190 XML_Parser expat; |
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191 ExpatParseContext context; |
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192 NodeInfo *nodes; |
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193 |
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194 g_return_val_if_fail (error == NULL || *error == NULL, NULL); |
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195 |
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196 if (len < 0) |
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197 len = strlen (str); |
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198 |
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199 expat = NULL; |
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200 context.parser = NULL; |
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201 context.error = error; |
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202 context.failed = FALSE; |
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203 |
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204 expat = XML_ParserCreate_MM ("UTF-8", &memsuite, NULL); |
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205 if (expat == NULL) |
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206 g_error ("No memory to create XML parser\n"); |
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207 |
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208 context.parser = parser_new (); |
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209 context.content = g_string_new (NULL); |
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210 |
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211 XML_SetUserData (expat, &context); |
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212 XML_SetElementHandler (expat, |
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213 expat_StartElementHandler, |
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214 expat_EndElementHandler); |
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215 XML_SetCharacterDataHandler (expat, |
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216 expat_CharacterDataHandler); |
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217 |
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218 if (!XML_Parse (expat, str, len, TRUE)) |
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219 { |
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220 if (context.error != NULL && |
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221 *context.error == NULL) |
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222 { |
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223 enum XML_Error e; |
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224 |
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225 e = XML_GetErrorCode (expat); |
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226 if (e == XML_ERROR_NO_MEMORY) |
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227 g_error ("Not enough memory to parse XML document"); |
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228 else |
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229 g_set_error (error, |
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230 G_MARKUP_ERROR, |
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231 G_MARKUP_ERROR_PARSE, |
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232 "Error in D-BUS description XML, line %d, column %d: %s\n", |
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233 XML_GetCurrentLineNumber (expat), |
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234 XML_GetCurrentColumnNumber (expat), |
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235 XML_ErrorString (e)); |
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236 } |
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237 |
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238 goto failed; |
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239 } |
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240 |
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241 if (context.failed) |
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242 goto failed; |
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243 |
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244 if (!parser_finished (context.parser, error)) |
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245 goto failed; |
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246 |
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247 XML_ParserFree (expat); |
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248 g_string_free (context.content, TRUE); |
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249 |
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250 g_return_val_if_fail (error == NULL || *error == NULL, NULL); |
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251 nodes = parser_get_nodes (context.parser); |
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252 node_info_ref (nodes); |
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253 parser_unref (context.parser); |
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254 return nodes; |
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255 |
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256 failed: |
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257 g_return_val_if_fail (error == NULL || *error != NULL, NULL); |
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258 |
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259 g_string_free (context.content, TRUE); |
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260 if (expat) |
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261 XML_ParserFree (expat); |
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262 if (context.parser) |
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263 parser_unref (context.parser); |
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264 return NULL; |
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265 } |
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266 |