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25
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1 /* |
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2 * This program is free software; you can redistribute it and/or modify |
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3 * it under the terms of the GNU General Public License as published by |
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4 * the Free Software Foundation; either version 2 of the License, or |
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5 * (at your option) any later version. |
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6 * |
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7 * This program is distributed in the hope that it will be useful, |
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8 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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10 * GNU General Public License for more details. |
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11 * |
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12 * You should have received a copy of the GNU General Public License |
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13 * along with this program; if not, write to the Free Software |
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14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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15 * |
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16 * Jabber |
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17 * Copyright (C) 1998-1999 The Jabber Team http://jabber.org/ |
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18 */ |
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19 |
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20 #include <libxode.h> |
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21 |
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22 /* xstream is a way to have a consistent method of handling incoming XML Stream based events... it doesn't handle the generation of an XML Stream, but provides some facilities to help do that */ |
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23 |
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24 /******* internal expat callbacks *********/ |
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25 void _xstream_startElement(xstream xs, const char* name, const char** atts) |
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26 { |
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27 pool p; |
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28 |
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29 /* if xstream is bad, get outa here */ |
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30 if(xs->status > XSTREAM_NODE) return; |
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31 |
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32 if(xs->node == NULL) |
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33 { |
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34 p = pool_heap(5*1024); /* 5k, typically 1-2k each plus copy of self and workspace */ |
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35 xs->node = xmlnode_new_tag_pool(p,name); |
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36 xmlnode_put_expat_attribs(xs->node, atts); |
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37 |
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38 if(xs->status == XSTREAM_ROOT) |
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39 { |
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40 xs->status = XSTREAM_NODE; /* flag status that we're processing nodes now */ |
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41 (xs->f)(XSTREAM_ROOT, xs->node, xs->arg); /* send the root, f must free all nodes */ |
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42 xs->node = NULL; |
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43 } |
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44 }else{ |
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45 xs->node = xmlnode_insert_tag(xs->node, name); |
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46 xmlnode_put_expat_attribs(xs->node, atts); |
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47 } |
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48 |
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49 /* depth check */ |
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50 xs->depth++; |
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51 if(xs->depth > XSTREAM_MAXDEPTH) |
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52 xs->status = XSTREAM_ERR; |
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53 } |
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54 |
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55 |
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56 void _xstream_endElement(xstream xs, const char* name) |
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57 { |
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58 xmlnode parent; |
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59 |
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60 /* if xstream is bad, get outa here */ |
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61 if(xs->status > XSTREAM_NODE) return; |
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62 |
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63 /* if it's already NULL we've received </stream>, tell the app and we're outta here */ |
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64 if(xs->node == NULL) |
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65 { |
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66 xs->status = XSTREAM_CLOSE; |
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67 (xs->f)(XSTREAM_CLOSE, NULL, xs->arg); |
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68 }else{ |
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69 parent = xmlnode_get_parent(xs->node); |
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70 |
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71 /* we are the top-most node, feed to the app who is responsible to delete it */ |
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72 if(parent == NULL) |
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73 (xs->f)(XSTREAM_NODE, xs->node, xs->arg); |
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74 |
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75 xs->node = parent; |
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76 } |
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77 xs->depth--; |
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78 } |
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79 |
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80 |
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81 void _xstream_charData(xstream xs, const char *str, int len) |
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82 { |
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83 /* if xstream is bad, get outa here */ |
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84 if(xs->status > XSTREAM_NODE) return; |
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85 |
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86 if(xs->node == NULL) |
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87 { |
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88 /* we must be in the root of the stream where CDATA is irrelevant */ |
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89 return; |
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90 } |
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91 |
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92 xmlnode_insert_cdata(xs->node, str, len); |
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93 } |
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94 |
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95 |
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96 void _xstream_cleanup(void *arg) |
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97 { |
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98 xstream xs = (xstream)arg; |
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99 |
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100 xmlnode_free(xs->node); /* cleanup anything left over */ |
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101 XML_ParserFree(xs->parser); |
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102 } |
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103 |
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104 |
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105 /* creates a new xstream with given pool, xstream will be cleaned up w/ pool */ |
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106 xstream xstream_new(pool p, xstream_onNode f, void *arg) |
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107 { |
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108 xstream newx; |
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109 |
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110 if(p == NULL || f == NULL) |
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111 { |
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112 fprintf(stderr,"Fatal Programming Error: xstream_new() was improperly called with NULL.\n"); |
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113 return NULL; |
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114 } |
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115 |
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116 newx = pmalloco(p, sizeof(_xstream)); |
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117 newx->p = p; |
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118 newx->f = f; |
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119 newx->arg = arg; |
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120 |
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121 /* create expat parser and ensure cleanup */ |
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122 newx->parser = XML_ParserCreate(NULL); |
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123 XML_SetUserData(newx->parser, (void *)newx); |
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124 XML_SetElementHandler(newx->parser, (void *)_xstream_startElement, (void *)_xstream_endElement); |
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125 XML_SetCharacterDataHandler(newx->parser, (void *)_xstream_charData); |
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126 pool_cleanup(p, _xstream_cleanup, (void *)newx); |
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127 |
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128 return newx; |
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129 } |
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130 |
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131 /* attempts to parse the buff onto this stream firing events to the handler, returns the last known status */ |
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132 int xstream_eat(xstream xs, char *buff, int len) |
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133 { |
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134 char *err; |
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135 xmlnode xerr; |
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136 static char maxerr[] = "maximum node size reached"; |
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137 static char deeperr[] = "maximum node depth reached"; |
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138 |
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139 if(xs == NULL) |
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140 { |
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141 fprintf(stderr,"Fatal Programming Error: xstream_eat() was improperly called with NULL.\n"); |
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142 return XSTREAM_ERR; |
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143 } |
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144 |
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145 if(len == 0 || buff == NULL) |
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146 return xs->status; |
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147 |
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148 if(len == -1) /* easy for hand-fed eat calls */ |
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149 len = strlen(buff); |
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150 |
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151 if(!XML_Parse(xs->parser, buff, len, 0)) |
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152 { |
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153 err = (char *)XML_ErrorString(XML_GetErrorCode(xs->parser)); |
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154 xs->status = XSTREAM_ERR; |
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155 }else if(pool_size(xmlnode_pool(xs->node)) > XSTREAM_MAXNODE || xs->cdata_len > XSTREAM_MAXNODE){ |
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156 err = maxerr; |
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157 xs->status = XSTREAM_ERR; |
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158 }else if(xs->status == XSTREAM_ERR){ /* set within expat handlers */ |
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159 err = deeperr; |
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160 } |
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161 |
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162 /* fire parsing error event, make a node containing the error string */ |
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163 if(xs->status == XSTREAM_ERR) |
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164 { |
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165 xerr = xmlnode_new_tag("error"); |
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166 xmlnode_insert_cdata(xerr,err,-1); |
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167 (xs->f)(XSTREAM_ERR, xerr, xs->arg); |
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168 } |
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169 |
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170 return xs->status; |
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171 } |
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172 |
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173 |
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174 /* STREAM CREATION UTILITIES */ |
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175 |
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176 /* give a standard template xmlnode to work from */ |
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177 xmlnode xstream_header(char *namespace, char *to, char *from) |
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178 { |
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179 xmlnode x; |
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180 char id[10]; |
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181 |
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182 sprintf(id,"%X",(int)time(NULL)); |
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183 |
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184 x = xmlnode_new_tag("stream:stream"); |
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185 xmlnode_put_attrib(x, "xmlns:stream", "http://etherx.jabber.org/streams"); |
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186 xmlnode_put_attrib(x, "id", id); |
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187 if(namespace != NULL) |
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188 xmlnode_put_attrib(x, "xmlns", namespace); |
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189 if(to != NULL) |
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190 xmlnode_put_attrib(x, "to", to); |
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191 if(from != NULL) |
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192 xmlnode_put_attrib(x, "from", from); |
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193 |
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194 return x; |
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195 } |
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196 |
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197 /* trim the xmlnode to only the opening header :) [NO CHILDREN ALLOWED] */ |
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198 char *xstream_header_char(xmlnode x) |
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199 { |
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200 spool s; |
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201 char *fixr, *head; |
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202 |
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203 if(xmlnode_has_children(x)) |
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204 { |
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205 fprintf(stderr,"Fatal Programming Error: xstream_header_char() was sent a header with children!\n"); |
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206 return NULL; |
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207 } |
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208 |
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209 s = spool_new(xmlnode_pool(x)); |
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210 spooler(s,"<?xml version='1.0'?>",xmlnode2str(x),s); |
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211 head = spool_print(s); |
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212 fixr = strstr(head,"/>"); |
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213 *fixr = '>'; |
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214 ++fixr; |
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215 *fixr = '\0'; |
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216 |
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217 return head; |
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218 } |
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219 |
