1 /* 2 __ __ _ 3 ___\ \/ /_ __ __ _| |_ 4 / _ \\ /| '_ \ / _` | __| 5 | __// \| |_) | (_| | |_ 6 \___/_/\_\ .__/ \__,_|\__| 7 |_| XML parser 8 9 Copyright (c) 1997-2000 Thai Open Source Software Center Ltd 10 Copyright (c) 2000-2017 Expat development team 11 Licensed under the MIT license: 12 13 Permission is hereby granted, free of charge, to any person obtaining 14 a copy of this software and associated documentation files (the 15 "Software"), to deal in the Software without restriction, including 16 without limitation the rights to use, copy, modify, merge, publish, 17 distribute, sublicense, and/or sell copies of the Software, and to permit 18 persons to whom the Software is furnished to do so, subject to the 19 following conditions: 20 21 The above copyright notice and this permission notice shall be included 22 in all copies or substantial portions of the Software. 23 24 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 27 NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 28 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 29 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 30 USE OR OTHER DEALINGS IN THE SOFTWARE. 31 */ 32 33 #include <string.h> 34 #include "xmlmime.h" 35 36 static const char * 37 getTok(const char **pp) 38 { 39 /* inComment means one level of nesting; inComment+1 means two levels etc */ 40 enum { inAtom, inString, init, inComment }; 41 int state = init; 42 const char *tokStart = 0; 43 for (;;) { 44 switch (**pp) { 45 case '\0': 46 if (state == inAtom) 47 return tokStart; 48 return 0; 49 case ' ': 50 case '\r': 51 case '\t': 52 case '\n': 53 if (state == inAtom) 54 return tokStart; 55 break; 56 case '(': 57 if (state == inAtom) 58 return tokStart; 59 if (state != inString) 60 state++; 61 break; 62 case ')': 63 if (state > init) 64 --state; 65 else if (state != inString) 66 return 0; 67 break; 68 case ';': 69 case '/': 70 case '=': 71 if (state == inAtom) 72 return tokStart; 73 if (state == init) 74 return (*pp)++; 75 break; 76 case '\\': 77 ++*pp; 78 if (**pp == '\0') 79 return 0; 80 break; 81 case '"': 82 switch (state) { 83 case inString: 84 ++*pp; 85 return tokStart; 86 case inAtom: 87 return tokStart; 88 case init: 89 tokStart = *pp; 90 state = inString; 91 break; 92 } 93 break; 94 default: 95 if (state == init) { 96 tokStart = *pp; 97 state = inAtom; 98 } 99 break; 100 } 101 ++*pp; 102 } 103 /* not reached */ 104 } 105 106 /* key must be lowercase ASCII */ 107 108 static int 109 matchkey(const char *start, const char *end, const char *key) 110 { 111 if (!start) 112 return 0; 113 for (; start != end; start++, key++) 114 if (*start != *key && *start != 'A' + (*key - 'a')) 115 return 0; 116 return *key == '\0'; 117 } 118 119 void 120 getXMLCharset(const char *buf, char *charset) 121 { 122 const char *next, *p; 123 124 charset[0] = '\0'; 125 next = buf; 126 p = getTok(&next); 127 if (matchkey(p, next, "text")) 128 strcpy(charset, "us-ascii"); 129 else if (!matchkey(p, next, "application")) 130 return; 131 p = getTok(&next); 132 if (!p || *p != '/') 133 return; 134 p = getTok(&next); 135 #if 0 136 if (!matchkey(p, next, "xml") && charset[0] == '\0') 137 return; 138 #endif 139 p = getTok(&next); 140 while (p) { 141 if (*p == ';') { 142 p = getTok(&next); 143 if (matchkey(p, next, "charset")) { 144 p = getTok(&next); 145 if (p && *p == '=') { 146 p = getTok(&next); 147 if (p) { 148 char *s = charset; 149 if (*p == '"') { 150 while (++p != next - 1) { 151 if (*p == '\\') 152 ++p; 153 if (s == charset + CHARSET_MAX - 1) { 154 charset[0] = '\0'; 155 break; 156 } 157 *s++ = *p; 158 } 159 *s++ = '\0'; 160 } 161 else { 162 if (next - p > CHARSET_MAX - 1) 163 break; 164 while (p != next) 165 *s++ = *p++; 166 *s = 0; 167 break; 168 } 169 } 170 } 171 break; 172 } 173 } 174 else 175 p = getTok(&next); 176 } 177 } 178 179 #ifdef TEST 180 181 #include <stdio.h> 182 183 int 184 main(int argc, char *argv[]) 185 { 186 char buf[CHARSET_MAX]; 187 if (argc <= 1) 188 return 1; 189 printf("%s\n", argv[1]); 190 getXMLCharset(argv[1], buf); 191 printf("charset=\"%s\"\n", buf); 192 return 0; 193 } 194 195 #endif /* TEST */ 196