xref: /minix/external/mit/expat/dist/lib/xmltok.c (revision 1230fdc1) 
1 /* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
2    See the file COPYING for copying permission.
3 */
4 
5 #include <stddef.h>
6 
7 #ifdef COMPILED_FROM_DSP
8 #include "winconfig.h"
9 #elif defined(MACOS_CLASSIC)
10 #include "macconfig.h"
11 #elif defined(__amigaos__)
12 #include "amigaconfig.h"
13 #elif defined(__WATCOMC__)
14 #include "watcomconfig.h"
15 #else
16 #ifdef HAVE_EXPAT_CONFIG_H
17 #include <expat_config.h>
18 #endif
19 #endif /* ndef COMPILED_FROM_DSP */
20 
21 #include "expat_external.h"
22 #include "internal.h"
23 #include "xmltok.h"
24 #include "nametab.h"
25 
26 #ifdef XML_DTD
27 #define IGNORE_SECTION_TOK_VTABLE , PREFIX(ignoreSectionTok)
28 #else
29 #define IGNORE_SECTION_TOK_VTABLE /* as nothing */
30 #endif
31 
32 #define VTABLE1 \
33   { PREFIX(prologTok), PREFIX(contentTok), \
34     PREFIX(cdataSectionTok) IGNORE_SECTION_TOK_VTABLE }, \
35   { PREFIX(attributeValueTok), PREFIX(entityValueTok) }, \
36   PREFIX(sameName), \
37   PREFIX(nameMatchesAscii), \
38   PREFIX(nameLength), \
39   PREFIX(skipS), \
40   PREFIX(getAtts), \
41   PREFIX(charRefNumber), \
42   PREFIX(predefinedEntityName), \
43   PREFIX(updatePosition), \
44   PREFIX(isPublicId)
45 
46 #define VTABLE VTABLE1, PREFIX(toUtf8), PREFIX(toUtf16)
47 
48 #define UCS2_GET_NAMING(pages, hi, lo) \
49    (namingBitmap[(pages[hi] << 3) + ((lo) >> 5)] & (1 << ((lo) & 0x1F)))
50 
51 /* A 2 byte UTF-8 representation splits the characters 11 bits between
52    the bottom 5 and 6 bits of the bytes.  We need 8 bits to index into
53    pages, 3 bits to add to that index and 5 bits to generate the mask.
54 */
55 #define UTF8_GET_NAMING2(pages, byte) \
56     (namingBitmap[((pages)[(((byte)[0]) >> 2) & 7] << 3) \
57                       + ((((byte)[0]) & 3) << 1) \
58                       + ((((byte)[1]) >> 5) & 1)] \
59          & (1 << (((byte)[1]) & 0x1F)))
60 
61 /* A 3 byte UTF-8 representation splits the characters 16 bits between
62    the bottom 4, 6 and 6 bits of the bytes.  We need 8 bits to index
63    into pages, 3 bits to add to that index and 5 bits to generate the
64    mask.
65 */
66 #define UTF8_GET_NAMING3(pages, byte) \
67   (namingBitmap[((pages)[((((byte)[0]) & 0xF) << 4) \
68                              + ((((byte)[1]) >> 2) & 0xF)] \
69                        << 3) \
70                       + ((((byte)[1]) & 3) << 1) \
71                       + ((((byte)[2]) >> 5) & 1)] \
72          & (1 << (((byte)[2]) & 0x1F)))
73 
74 #define UTF8_GET_NAMING(pages, p, n) \
75   ((n) == 2 \
76   ? UTF8_GET_NAMING2(pages, (const unsigned char *)(p)) \
77   : ((n) == 3 \
78      ? UTF8_GET_NAMING3(pages, (const unsigned char *)(p)) \
79      : 0))
80 
81 /* Detection of invalid UTF-8 sequences is based on Table 3.1B
82    of Unicode 3.2: http://www.unicode.org/unicode/reports/tr28/
83    with the additional restriction of not allowing the Unicode
84    code points 0xFFFF and 0xFFFE (sequences EF,BF,BF and EF,BF,BE).
85    Implementation details:
86      (A & 0x80) == 0     means A < 0x80
87    and
88      (A & 0xC0) == 0xC0  means A > 0xBF
89 */
90 
91 #define UTF8_INVALID2(p) \
92   ((*p) < 0xC2 || ((p)[1] & 0x80) == 0 || ((p)[1] & 0xC0) == 0xC0)
93 
94 #define UTF8_INVALID3(p) \
95   (((p)[2] & 0x80) == 0 \
96   || \
97   ((*p) == 0xEF && (p)[1] == 0xBF \
98     ? \
99     (p)[2] > 0xBD \
100     : \
101     ((p)[2] & 0xC0) == 0xC0) \
102   || \
103   ((*p) == 0xE0 \
104     ? \
105     (p)[1] < 0xA0 || ((p)[1] & 0xC0) == 0xC0 \
106     : \
107     ((p)[1] & 0x80) == 0 \
108     || \
109     ((*p) == 0xED ? (p)[1] > 0x9F : ((p)[1] & 0xC0) == 0xC0)))
110 
111 #define UTF8_INVALID4(p) \
112   (((p)[3] & 0x80) == 0 || ((p)[3] & 0xC0) == 0xC0 \
113   || \
114   ((p)[2] & 0x80) == 0 || ((p)[2] & 0xC0) == 0xC0 \
115   || \
116   ((*p) == 0xF0 \
117     ? \
118     (p)[1] < 0x90 || ((p)[1] & 0xC0) == 0xC0 \
119     : \
120     ((p)[1] & 0x80) == 0 \
121     || \
122     ((*p) == 0xF4 ? (p)[1] > 0x8F : ((p)[1] & 0xC0) == 0xC0)))
123 
124 static int PTRFASTCALL
isNever(const ENCODING * enc,const char * p)125 isNever(const ENCODING *enc, const char *p)
126 {
127   return 0;
128 }
129 
130 static int PTRFASTCALL
utf8_isName2(const ENCODING * enc,const char * p)131 utf8_isName2(const ENCODING *enc, const char *p)
132 {
133   return UTF8_GET_NAMING2(namePages, (const unsigned char *)p);
134 }
135 
136 static int PTRFASTCALL
utf8_isName3(const ENCODING * enc,const char * p)137 utf8_isName3(const ENCODING *enc, const char *p)
138 {
139   return UTF8_GET_NAMING3(namePages, (const unsigned char *)p);
140 }
141 
142 #define utf8_isName4 isNever
143 
144 static int PTRFASTCALL
utf8_isNmstrt2(const ENCODING * enc,const char * p)145 utf8_isNmstrt2(const ENCODING *enc, const char *p)
146 {
147   return UTF8_GET_NAMING2(nmstrtPages, (const unsigned char *)p);
148 }
149 
150 static int PTRFASTCALL
utf8_isNmstrt3(const ENCODING * enc,const char * p)151 utf8_isNmstrt3(const ENCODING *enc, const char *p)
152 {
153   return UTF8_GET_NAMING3(nmstrtPages, (const unsigned char *)p);
154 }
155 
156 #define utf8_isNmstrt4 isNever
157 
158 static int PTRFASTCALL
utf8_isInvalid2(const ENCODING * enc,const char * p)159 utf8_isInvalid2(const ENCODING *enc, const char *p)
160 {
161   return UTF8_INVALID2((const unsigned char *)p);
162 }
163 
164 static int PTRFASTCALL
utf8_isInvalid3(const ENCODING * enc,const char * p)165 utf8_isInvalid3(const ENCODING *enc, const char *p)
166 {
167   return UTF8_INVALID3((const unsigned char *)p);
168 }
169 
170 static int PTRFASTCALL
utf8_isInvalid4(const ENCODING * enc,const char * p)171 utf8_isInvalid4(const ENCODING *enc, const char *p)
172 {
173   return UTF8_INVALID4((const unsigned char *)p);
174 }
175 
176 struct normal_encoding {
177   ENCODING enc;
178   unsigned char type[256];
179 #ifdef XML_MIN_SIZE
180   int (PTRFASTCALL *byteType)(const ENCODING *, const char *);
181   int (PTRFASTCALL *isNameMin)(const ENCODING *, const char *);
182   int (PTRFASTCALL *isNmstrtMin)(const ENCODING *, const char *);
183   int (PTRFASTCALL *byteToAscii)(const ENCODING *, const char *);
184   int (PTRCALL *charMatches)(const ENCODING *, const char *, int);
185 #endif /* XML_MIN_SIZE */
186   int (PTRFASTCALL *isName2)(const ENCODING *, const char *);
187   int (PTRFASTCALL *isName3)(const ENCODING *, const char *);
188   int (PTRFASTCALL *isName4)(const ENCODING *, const char *);
189   int (PTRFASTCALL *isNmstrt2)(const ENCODING *, const char *);
190   int (PTRFASTCALL *isNmstrt3)(const ENCODING *, const char *);
191   int (PTRFASTCALL *isNmstrt4)(const ENCODING *, const char *);
192   int (PTRFASTCALL *isInvalid2)(const ENCODING *, const char *);
193   int (PTRFASTCALL *isInvalid3)(const ENCODING *, const char *);
194   int (PTRFASTCALL *isInvalid4)(const ENCODING *, const char *);
195 };
196 
197 #define AS_NORMAL_ENCODING(enc)   ((const struct normal_encoding *) (enc))
198 
199 #ifdef XML_MIN_SIZE
200 
201 #define STANDARD_VTABLE(E) \
202  E ## byteType, \
203  E ## isNameMin, \
204  E ## isNmstrtMin, \
205  E ## byteToAscii, \
206  E ## charMatches,
207 
208 #else
209 
210 #define STANDARD_VTABLE(E) /* as nothing */
211 
212 #endif
213 
214 #define NORMAL_VTABLE(E) \
215  E ## isName2, \
216  E ## isName3, \
217  E ## isName4, \
218  E ## isNmstrt2, \
219  E ## isNmstrt3, \
220  E ## isNmstrt4, \
221  E ## isInvalid2, \
222  E ## isInvalid3, \
223  E ## isInvalid4
224 
225 static int FASTCALL checkCharRefNumber(int);
226 
227 #include "xmltok_impl.h"
228 #include "ascii.h"
229 
230 #ifdef XML_MIN_SIZE
231 #define sb_isNameMin isNever
232 #define sb_isNmstrtMin isNever
233 #endif
234 
235 #ifdef XML_MIN_SIZE
236 #define MINBPC(enc) ((enc)->minBytesPerChar)
237 #else
238 /* minimum bytes per character */
239 #define MINBPC(enc) 1
240 #endif
241 
242 #define SB_BYTE_TYPE(enc, p) \
243   (((struct normal_encoding *)(enc))->type[(unsigned char)*(p)])
244 
245 #ifdef XML_MIN_SIZE
246 static int PTRFASTCALL
sb_byteType(const ENCODING * enc,const char * p)247 sb_byteType(const ENCODING *enc, const char *p)
248 {
249   return SB_BYTE_TYPE(enc, p);
250 }
251 #define BYTE_TYPE(enc, p) \
252  (AS_NORMAL_ENCODING(enc)->byteType(enc, p))
253 #else
254 #define BYTE_TYPE(enc, p) SB_BYTE_TYPE(enc, p)
255 #endif
256 
257 #ifdef XML_MIN_SIZE
258 #define BYTE_TO_ASCII(enc, p) \
259  (AS_NORMAL_ENCODING(enc)->byteToAscii(enc, p))
260 static int PTRFASTCALL
sb_byteToAscii(const ENCODING * enc,const char * p)261 sb_byteToAscii(const ENCODING *enc, const char *p)
262 {
263   return *p;
264 }
265 #else
266 #define BYTE_TO_ASCII(enc, p) (*(p))
267 #endif
268 
269 #define IS_NAME_CHAR(enc, p, n) \
270  (AS_NORMAL_ENCODING(enc)->isName ## n(enc, p))
271 #define IS_NMSTRT_CHAR(enc, p, n) \
272  (AS_NORMAL_ENCODING(enc)->isNmstrt ## n(enc, p))
273 #define IS_INVALID_CHAR(enc, p, n) \
274  (AS_NORMAL_ENCODING(enc)->isInvalid ## n(enc, p))
275 
276 #ifdef XML_MIN_SIZE
277 #define IS_NAME_CHAR_MINBPC(enc, p) \
278  (AS_NORMAL_ENCODING(enc)->isNameMin(enc, p))
279 #define IS_NMSTRT_CHAR_MINBPC(enc, p) \
280  (AS_NORMAL_ENCODING(enc)->isNmstrtMin(enc, p))
281 #else
282 #define IS_NAME_CHAR_MINBPC(enc, p) (0)
283 #define IS_NMSTRT_CHAR_MINBPC(enc, p) (0)
284 #endif
285 
286 #ifdef XML_MIN_SIZE
287 #define CHAR_MATCHES(enc, p, c) \
288  (AS_NORMAL_ENCODING(enc)->charMatches(enc, p, c))
289 static int PTRCALL
sb_charMatches(const ENCODING * enc,const char * p,int c)290 sb_charMatches(const ENCODING *enc, const char *p, int c)
291 {
292   return *p == c;
293 }
294 #else
295 /* c is an ASCII character */
296 #define CHAR_MATCHES(enc, p, c) (*(p) == c)
297 #endif
298 
299 #define PREFIX(ident) normal_ ## ident
300 #define XML_TOK_IMPL_C
301 #include "xmltok_impl.c"
302 #undef XML_TOK_IMPL_C
303 
304 #undef MINBPC
305 #undef BYTE_TYPE
306 #undef BYTE_TO_ASCII
307 #undef CHAR_MATCHES
308 #undef IS_NAME_CHAR
309 #undef IS_NAME_CHAR_MINBPC
310 #undef IS_NMSTRT_CHAR
311 #undef IS_NMSTRT_CHAR_MINBPC
312 #undef IS_INVALID_CHAR
313 
314 enum {  /* UTF8_cvalN is value of masked first byte of N byte sequence */
315   UTF8_cval1 = 0x00,
316   UTF8_cval2 = 0xc0,
317   UTF8_cval3 = 0xe0,
318   UTF8_cval4 = 0xf0
319 };
320 
321 static void PTRCALL
utf8_toUtf8(const ENCODING * enc,const char ** fromP,const char * fromLim,char ** toP,const char * toLim)322 utf8_toUtf8(const ENCODING *enc,
323             const char **fromP, const char *fromLim,
324             char **toP, const char *toLim)
325 {
326   char *to;
327   const char *from;
328   if (fromLim - *fromP > toLim - *toP) {
329     /* Avoid copying partial characters. */
330     for (fromLim = *fromP + (toLim - *toP); fromLim > *fromP; fromLim--)
331       if (((unsigned char)fromLim[-1] & 0xc0) != 0x80)
332         break;
333   }
334   for (to = *toP, from = *fromP; from != fromLim; from++, to++)
335     *to = *from;
336   *fromP = from;
337   *toP = to;
338 }
339 
340 static void PTRCALL
utf8_toUtf16(const ENCODING * enc,const char ** fromP,const char * fromLim,unsigned short ** toP,const unsigned short * toLim)341 utf8_toUtf16(const ENCODING *enc,
342              const char **fromP, const char *fromLim,
343              unsigned short **toP, const unsigned short *toLim)
344 {
345   unsigned short *to = *toP;
346   const char *from = *fromP;
347   while (from != fromLim && to != toLim) {
348     switch (((struct normal_encoding *)enc)->type[(unsigned char)*from]) {
349     case BT_LEAD2:
350       *to++ = (unsigned short)(((from[0] & 0x1f) << 6) | (from[1] & 0x3f));
351       from += 2;
352       break;
353     case BT_LEAD3:
354       *to++ = (unsigned short)(((from[0] & 0xf) << 12)
355                                | ((from[1] & 0x3f) << 6) | (from[2] & 0x3f));
356       from += 3;
357       break;
358     case BT_LEAD4:
359       {
360         unsigned long n;
361         if (to + 1 == toLim)
362           goto after;
363         n = ((from[0] & 0x7) << 18) | ((from[1] & 0x3f) << 12)
364             | ((from[2] & 0x3f) << 6) | (from[3] & 0x3f);
365         n -= 0x10000;
366         to[0] = (unsigned short)((n >> 10) | 0xD800);
367         to[1] = (unsigned short)((n & 0x3FF) | 0xDC00);
368         to += 2;
369         from += 4;
370       }
371       break;
372     default:
373       *to++ = *from++;
374       break;
375     }
376   }
377 after:
378   *fromP = from;
379   *toP = to;
380 }
381 
382 #ifdef XML_NS
383 static const struct normal_encoding utf8_encoding_ns = {
384   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
385   {
386 #include "asciitab.h"
387 #include "utf8tab.h"
388   },
389   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
390 };
391 #endif
392 
393 static const struct normal_encoding utf8_encoding = {
394   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
395   {
396 #define BT_COLON BT_NMSTRT
397 #include "asciitab.h"
398 #undef BT_COLON
399 #include "utf8tab.h"
400   },
401   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
402 };
403 
404 #ifdef XML_NS
405 
406 static const struct normal_encoding internal_utf8_encoding_ns = {
407   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
408   {
409 #include "iasciitab.h"
410 #include "utf8tab.h"
411   },
412   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
413 };
414 
415 #endif
416 
417 static const struct normal_encoding internal_utf8_encoding = {
418   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
419   {
420 #define BT_COLON BT_NMSTRT
421 #include "iasciitab.h"
422 #undef BT_COLON
423 #include "utf8tab.h"
424   },
425   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
426 };
427 
428 static void PTRCALL
latin1_toUtf8(const ENCODING * enc,const char ** fromP,const char * fromLim,char ** toP,const char * toLim)429 latin1_toUtf8(const ENCODING *enc,
430               const char **fromP, const char *fromLim,
431               char **toP, const char *toLim)
432 {
433   for (;;) {
434     unsigned char c;
435     if (*fromP == fromLim)
436       break;
437     c = (unsigned char)**fromP;
438     if (c & 0x80) {
439       if (toLim - *toP < 2)
440         break;
441       *(*toP)++ = (char)((c >> 6) | UTF8_cval2);
442       *(*toP)++ = (char)((c & 0x3f) | 0x80);
443       (*fromP)++;
444     }
445     else {
446       if (*toP == toLim)
447         break;
448       *(*toP)++ = *(*fromP)++;
449     }
450   }
451 }
452 
453 static void PTRCALL
latin1_toUtf16(const ENCODING * enc,const char ** fromP,const char * fromLim,unsigned short ** toP,const unsigned short * toLim)454 latin1_toUtf16(const ENCODING *enc,
455                const char **fromP, const char *fromLim,
456                unsigned short **toP, const unsigned short *toLim)
457 {
458   while (*fromP != fromLim && *toP != toLim)
459     *(*toP)++ = (unsigned char)*(*fromP)++;
460 }
461 
462 #ifdef XML_NS
463 
464 static const struct normal_encoding latin1_encoding_ns = {
465   { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },
466   {
467 #include "asciitab.h"
468 #include "latin1tab.h"
469   },
470   STANDARD_VTABLE(sb_)
471 };
472 
473 #endif
474 
475 static const struct normal_encoding latin1_encoding = {
476   { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },
477   {
478 #define BT_COLON BT_NMSTRT
479 #include "asciitab.h"
480 #undef BT_COLON
481 #include "latin1tab.h"
482   },
483   STANDARD_VTABLE(sb_)
484 };
485 
486 static void PTRCALL
ascii_toUtf8(const ENCODING * enc,const char ** fromP,const char * fromLim,char ** toP,const char * toLim)487 ascii_toUtf8(const ENCODING *enc,
488              const char **fromP, const char *fromLim,
489              char **toP, const char *toLim)
490 {
491   while (*fromP != fromLim && *toP != toLim)
492     *(*toP)++ = *(*fromP)++;
493 }
494 
495 #ifdef XML_NS
496 
497 static const struct normal_encoding ascii_encoding_ns = {
498   { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },
499   {
500 #include "asciitab.h"
501 /* BT_NONXML == 0 */
502   },
503   STANDARD_VTABLE(sb_)
504 };
505 
506 #endif
507 
508 static const struct normal_encoding ascii_encoding = {
509   { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },
510   {
511 #define BT_COLON BT_NMSTRT
512 #include "asciitab.h"
513 #undef BT_COLON
514 /* BT_NONXML == 0 */
515   },
516   STANDARD_VTABLE(sb_)
517 };
518 
519 static int PTRFASTCALL
unicode_byte_type(char hi,char lo)520 unicode_byte_type(char hi, char lo)
521 {
522   switch ((unsigned char)hi) {
523   case 0xD8: case 0xD9: case 0xDA: case 0xDB:
524     return BT_LEAD4;
525   case 0xDC: case 0xDD: case 0xDE: case 0xDF:
526     return BT_TRAIL;
527   case 0xFF:
528     switch ((unsigned char)lo) {
529     case 0xFF:
530     case 0xFE:
531       return BT_NONXML;
532     }
533     break;
534   }
535   return BT_NONASCII;
536 }
537 
538 #define DEFINE_UTF16_TO_UTF8(E) \
539 static void  PTRCALL \
540 E ## toUtf8(const ENCODING *enc, \
541             const char **fromP, const char *fromLim, \
542             char **toP, const char *toLim) \
543 { \
544   const char *from; \
545   for (from = *fromP; from != fromLim; from += 2) { \
546     int plane; \
547     unsigned char lo2; \
548     unsigned char lo = GET_LO(from); \
549     unsigned char hi = GET_HI(from); \
550     switch (hi) { \
551     case 0: \
552       if (lo < 0x80) { \
553         if (*toP == toLim) { \
554           *fromP = from; \
555           return; \
556         } \
557         *(*toP)++ = lo; \
558         break; \
559       } \
560       /* fall through */ \
561     case 0x1: case 0x2: case 0x3: \
562     case 0x4: case 0x5: case 0x6: case 0x7: \
563       if (toLim -  *toP < 2) { \
564         *fromP = from; \
565         return; \
566       } \
567       *(*toP)++ = ((lo >> 6) | (hi << 2) |  UTF8_cval2); \
568       *(*toP)++ = ((lo & 0x3f) | 0x80); \
569       break; \
570     default: \
571       if (toLim -  *toP < 3)  { \
572         *fromP = from; \
573         return; \
574       } \
575       /* 16 bits divided 4, 6, 6 amongst 3 bytes */ \
576       *(*toP)++ = ((hi >> 4) | UTF8_cval3); \
577       *(*toP)++ = (((hi & 0xf) << 2) | (lo >> 6) | 0x80); \
578       *(*toP)++ = ((lo & 0x3f) | 0x80); \
579       break; \
580     case 0xD8: case 0xD9: case 0xDA: case 0xDB: \
581       if (toLim -  *toP < 4) { \
582         *fromP = from; \
583         return; \
584       } \
585       plane = (((hi & 0x3) << 2) | ((lo >> 6) & 0x3)) + 1; \
586       *(*toP)++ = ((plane >> 2) | UTF8_cval4); \
587       *(*toP)++ = (((lo >> 2) & 0xF) | ((plane & 0x3) << 4) | 0x80); \
588       from += 2; \
589       lo2 = GET_LO(from); \
590       *(*toP)++ = (((lo & 0x3) << 4) \
591                    | ((GET_HI(from) & 0x3) << 2) \
592                    | (lo2 >> 6) \
593                    | 0x80); \
594       *(*toP)++ = ((lo2 & 0x3f) | 0x80); \
595       break; \
596     } \
597   } \
598   *fromP = from; \
599 }
600 
601 #define DEFINE_UTF16_TO_UTF16(E) \
602 static void  PTRCALL \
603 E ## toUtf16(const ENCODING *enc, \
604              const char **fromP, const char *fromLim, \
605              unsigned short **toP, const unsigned short *toLim) \
606 { \
607   /* Avoid copying first half only of surrogate */ \
608   if (fromLim - *fromP > ((toLim - *toP) << 1) \
609       && (GET_HI(fromLim - 2) & 0xF8) == 0xD8) \
610     fromLim -= 2; \
611   for (; *fromP != fromLim && *toP != toLim; *fromP += 2) \
612     *(*toP)++ = (GET_HI(*fromP) << 8) | GET_LO(*fromP); \
613 }
614 
615 #define SET2(ptr, ch) \
616   (((ptr)[0] = ((ch) & 0xff)), ((ptr)[1] = ((ch) >> 8)))
617 #define GET_LO(ptr) ((unsigned char)(ptr)[0])
618 #define GET_HI(ptr) ((unsigned char)(ptr)[1])
619 
620 DEFINE_UTF16_TO_UTF8(little2_)
DEFINE_UTF16_TO_UTF16(little2_)621 DEFINE_UTF16_TO_UTF16(little2_)
622 
623 #undef SET2
624 #undef GET_LO
625 #undef GET_HI
626 
627 #define SET2(ptr, ch) \
628   (((ptr)[0] = ((ch) >> 8)), ((ptr)[1] = ((ch) & 0xFF)))
629 #define GET_LO(ptr) ((unsigned char)(ptr)[1])
630 #define GET_HI(ptr) ((unsigned char)(ptr)[0])
631 
632 DEFINE_UTF16_TO_UTF8(big2_)
633 DEFINE_UTF16_TO_UTF16(big2_)
634 
635 #undef SET2
636 #undef GET_LO
637 #undef GET_HI
638 
639 #define LITTLE2_BYTE_TYPE(enc, p) \
640  ((p)[1] == 0 \
641   ? ((struct normal_encoding *)(enc))->type[(unsigned char)*(p)] \
642   : unicode_byte_type((p)[1], (p)[0]))
643 #define LITTLE2_BYTE_TO_ASCII(enc, p) ((p)[1] == 0 ? (p)[0] : -1)
644 #define LITTLE2_CHAR_MATCHES(enc, p, c) ((p)[1] == 0 && (p)[0] == c)
645 #define LITTLE2_IS_NAME_CHAR_MINBPC(enc, p) \
646   UCS2_GET_NAMING(namePages, (unsigned char)p[1], (unsigned char)p[0])
647 #define LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
648   UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[1], (unsigned char)p[0])
649 
650 #ifdef XML_MIN_SIZE
651 
652 static int PTRFASTCALL
653 little2_byteType(const ENCODING *enc, const char *p)
654 {
655   return LITTLE2_BYTE_TYPE(enc, p);
656 }
657 
658 static int PTRFASTCALL
little2_byteToAscii(const ENCODING * enc,const char * p)659 little2_byteToAscii(const ENCODING *enc, const char *p)
660 {
661   return LITTLE2_BYTE_TO_ASCII(enc, p);
662 }
663 
664 static int PTRCALL
little2_charMatches(const ENCODING * enc,const char * p,int c)665 little2_charMatches(const ENCODING *enc, const char *p, int c)
666 {
667   return LITTLE2_CHAR_MATCHES(enc, p, c);
668 }
669 
670 static int PTRFASTCALL
little2_isNameMin(const ENCODING * enc,const char * p)671 little2_isNameMin(const ENCODING *enc, const char *p)
672 {
673   return LITTLE2_IS_NAME_CHAR_MINBPC(enc, p);
674 }
675 
676 static int PTRFASTCALL
little2_isNmstrtMin(const ENCODING * enc,const char * p)677 little2_isNmstrtMin(const ENCODING *enc, const char *p)
678 {
679   return LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p);
680 }
681 
682 #undef VTABLE
683 #define VTABLE VTABLE1, little2_toUtf8, little2_toUtf16
684 
685 #else /* not XML_MIN_SIZE */
686 
687 #undef PREFIX
688 #define PREFIX(ident) little2_ ## ident
689 #define MINBPC(enc) 2
690 /* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
691 #define BYTE_TYPE(enc, p) LITTLE2_BYTE_TYPE(enc, p)
692 #define BYTE_TO_ASCII(enc, p) LITTLE2_BYTE_TO_ASCII(enc, p)
693 #define CHAR_MATCHES(enc, p, c) LITTLE2_CHAR_MATCHES(enc, p, c)
694 #define IS_NAME_CHAR(enc, p, n) 0
695 #define IS_NAME_CHAR_MINBPC(enc, p) LITTLE2_IS_NAME_CHAR_MINBPC(enc, p)
696 #define IS_NMSTRT_CHAR(enc, p, n) (0)
697 #define IS_NMSTRT_CHAR_MINBPC(enc, p) LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p)
698 
699 #define XML_TOK_IMPL_C
700 #include "xmltok_impl.c"
701 #undef XML_TOK_IMPL_C
702 
703 #undef MINBPC
704 #undef BYTE_TYPE
705 #undef BYTE_TO_ASCII
706 #undef CHAR_MATCHES
707 #undef IS_NAME_CHAR
708 #undef IS_NAME_CHAR_MINBPC
709 #undef IS_NMSTRT_CHAR
710 #undef IS_NMSTRT_CHAR_MINBPC
711 #undef IS_INVALID_CHAR
712 
713 #endif /* not XML_MIN_SIZE */
714 
715 #ifdef XML_NS
716 
717 static const struct normal_encoding little2_encoding_ns = {
718   { VTABLE, 2, 0,
719 #if BYTEORDER == 1234
720     1
721 #else
722     0
723 #endif
724   },
725   {
726 #include "asciitab.h"
727 #include "latin1tab.h"
728   },
729   STANDARD_VTABLE(little2_)
730 };
731 
732 #endif
733 
734 static const struct normal_encoding little2_encoding = {
735   { VTABLE, 2, 0,
736 #if BYTEORDER == 1234
737     1
738 #else
739     0
740 #endif
741   },
742   {
743 #define BT_COLON BT_NMSTRT
744 #include "asciitab.h"
745 #undef BT_COLON
746 #include "latin1tab.h"
747   },
748   STANDARD_VTABLE(little2_)
749 };
750 
751 #if BYTEORDER != 4321
752 
753 #ifdef XML_NS
754 
755 static const struct normal_encoding internal_little2_encoding_ns = {
756   { VTABLE, 2, 0, 1 },
757   {
758 #include "iasciitab.h"
759 #include "latin1tab.h"
760   },
761   STANDARD_VTABLE(little2_)
762 };
763 
764 #endif
765 
766 static const struct normal_encoding internal_little2_encoding = {
767   { VTABLE, 2, 0, 1 },
768   {
769 #define BT_COLON BT_NMSTRT
770 #include "iasciitab.h"
771 #undef BT_COLON
772 #include "latin1tab.h"
773   },
774   STANDARD_VTABLE(little2_)
775 };
776 
777 #endif
778 
779 
780 #define BIG2_BYTE_TYPE(enc, p) \
781  ((p)[0] == 0 \
782   ? ((struct normal_encoding *)(enc))->type[(unsigned char)(p)[1]] \
783   : unicode_byte_type((p)[0], (p)[1]))
784 #define BIG2_BYTE_TO_ASCII(enc, p) ((p)[0] == 0 ? (p)[1] : -1)
785 #define BIG2_CHAR_MATCHES(enc, p, c) ((p)[0] == 0 && (p)[1] == c)
786 #define BIG2_IS_NAME_CHAR_MINBPC(enc, p) \
787   UCS2_GET_NAMING(namePages, (unsigned char)p[0], (unsigned char)p[1])
788 #define BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
789   UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[0], (unsigned char)p[1])
790 
791 #ifdef XML_MIN_SIZE
792 
793 static int PTRFASTCALL
big2_byteType(const ENCODING * enc,const char * p)794 big2_byteType(const ENCODING *enc, const char *p)
795 {
796   return BIG2_BYTE_TYPE(enc, p);
797 }
798 
799 static int PTRFASTCALL
big2_byteToAscii(const ENCODING * enc,const char * p)800 big2_byteToAscii(const ENCODING *enc, const char *p)
801 {
802   return BIG2_BYTE_TO_ASCII(enc, p);
803 }
804 
805 static int PTRCALL
big2_charMatches(const ENCODING * enc,const char * p,int c)806 big2_charMatches(const ENCODING *enc, const char *p, int c)
807 {
808   return BIG2_CHAR_MATCHES(enc, p, c);
809 }
810 
811 static int PTRFASTCALL
big2_isNameMin(const ENCODING * enc,const char * p)812 big2_isNameMin(const ENCODING *enc, const char *p)
813 {
814   return BIG2_IS_NAME_CHAR_MINBPC(enc, p);
815 }
816 
817 static int PTRFASTCALL
big2_isNmstrtMin(const ENCODING * enc,const char * p)818 big2_isNmstrtMin(const ENCODING *enc, const char *p)
819 {
820   return BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p);
821 }
822 
823 #undef VTABLE
824 #define VTABLE VTABLE1, big2_toUtf8, big2_toUtf16
825 
826 #else /* not XML_MIN_SIZE */
827 
828 #undef PREFIX
829 #define PREFIX(ident) big2_ ## ident
830 #define MINBPC(enc) 2
831 /* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
832 #define BYTE_TYPE(enc, p) BIG2_BYTE_TYPE(enc, p)
833 #define BYTE_TO_ASCII(enc, p) BIG2_BYTE_TO_ASCII(enc, p)
834 #define CHAR_MATCHES(enc, p, c) BIG2_CHAR_MATCHES(enc, p, c)
835 #define IS_NAME_CHAR(enc, p, n) 0
836 #define IS_NAME_CHAR_MINBPC(enc, p) BIG2_IS_NAME_CHAR_MINBPC(enc, p)
837 #define IS_NMSTRT_CHAR(enc, p, n) (0)
838 #define IS_NMSTRT_CHAR_MINBPC(enc, p) BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p)
839 
840 #define XML_TOK_IMPL_C
841 #include "xmltok_impl.c"
842 #undef XML_TOK_IMPL_C
843 
844 #undef MINBPC
845 #undef BYTE_TYPE
846 #undef BYTE_TO_ASCII
847 #undef CHAR_MATCHES
848 #undef IS_NAME_CHAR
849 #undef IS_NAME_CHAR_MINBPC
850 #undef IS_NMSTRT_CHAR
851 #undef IS_NMSTRT_CHAR_MINBPC
852 #undef IS_INVALID_CHAR
853 
854 #endif /* not XML_MIN_SIZE */
855 
856 #ifdef XML_NS
857 
858 static const struct normal_encoding big2_encoding_ns = {
859   { VTABLE, 2, 0,
860 #if BYTEORDER == 4321
861   1
862 #else
863   0
864 #endif
865   },
866   {
867 #include "asciitab.h"
868 #include "latin1tab.h"
869   },
870   STANDARD_VTABLE(big2_)
871 };
872 
873 #endif
874 
875 static const struct normal_encoding big2_encoding = {
876   { VTABLE, 2, 0,
877 #if BYTEORDER == 4321
878   1
879 #else
880   0
881 #endif
882   },
883   {
884 #define BT_COLON BT_NMSTRT
885 #include "asciitab.h"
886 #undef BT_COLON
887 #include "latin1tab.h"
888   },
889   STANDARD_VTABLE(big2_)
890 };
891 
892 #if BYTEORDER != 1234
893 
894 #ifdef XML_NS
895 
896 static const struct normal_encoding internal_big2_encoding_ns = {
897   { VTABLE, 2, 0, 1 },
898   {
899 #include "iasciitab.h"
900 #include "latin1tab.h"
901   },
902   STANDARD_VTABLE(big2_)
903 };
904 
905 #endif
906 
907 static const struct normal_encoding internal_big2_encoding = {
908   { VTABLE, 2, 0, 1 },
909   {
910 #define BT_COLON BT_NMSTRT
911 #include "iasciitab.h"
912 #undef BT_COLON
913 #include "latin1tab.h"
914   },
915   STANDARD_VTABLE(big2_)
916 };
917 
918 #endif
919 
920 #undef PREFIX
921 
922 static int FASTCALL
streqci(const char * s1,const char * s2)923 streqci(const char *s1, const char *s2)
924 {
925   for (;;) {
926     char c1 = *s1++;
927     char c2 = *s2++;
928     if (ASCII_a <= c1 && c1 <= ASCII_z)
929       c1 += ASCII_A - ASCII_a;
930     if (ASCII_a <= c2 && c2 <= ASCII_z)
931       c2 += ASCII_A - ASCII_a;
932     if (c1 != c2)
933       return 0;
934     if (!c1)
935       break;
936   }
937   return 1;
938 }
939 
940 static void PTRCALL
initUpdatePosition(const ENCODING * enc,const char * ptr,const char * end,POSITION * pos)941 initUpdatePosition(const ENCODING *enc, const char *ptr,
942                    const char *end, POSITION *pos)
943 {
944   normal_updatePosition(&utf8_encoding.enc, ptr, end, pos);
945 }
946 
947 static int
toAscii(const ENCODING * enc,const char * ptr,const char * end)948 toAscii(const ENCODING *enc, const char *ptr, const char *end)
949 {
950   char buf[1];
951   char *p = buf;
952   XmlUtf8Convert(enc, &ptr, end, &p, p + 1);
953   if (p == buf)
954     return -1;
955   else
956     return buf[0];
957 }
958 
959 static int FASTCALL
isSpace(int c)960 isSpace(int c)
961 {
962   switch (c) {
963   case 0x20:
964   case 0xD:
965   case 0xA:
966   case 0x9:
967     return 1;
968   }
969   return 0;
970 }
971 
972 /* Return 1 if there's just optional white space or there's an S
973    followed by name=val.
974 */
975 static int
parsePseudoAttribute(const ENCODING * enc,const char * ptr,const char * end,const char ** namePtr,const char ** nameEndPtr,const char ** valPtr,const char ** nextTokPtr)976 parsePseudoAttribute(const ENCODING *enc,
977                      const char *ptr,
978                      const char *end,
979                      const char **namePtr,
980                      const char **nameEndPtr,
981                      const char **valPtr,
982                      const char **nextTokPtr)
983 {
984   int c;
985   char open;
986   if (ptr == end) {
987     *namePtr = NULL;
988     return 1;
989   }
990   if (!isSpace(toAscii(enc, ptr, end))) {
991     *nextTokPtr = ptr;
992     return 0;
993   }
994   do {
995     ptr += enc->minBytesPerChar;
996   } while (isSpace(toAscii(enc, ptr, end)));
997   if (ptr == end) {
998     *namePtr = NULL;
999     return 1;
1000   }
1001   *namePtr = ptr;
1002   for (;;) {
1003     c = toAscii(enc, ptr, end);
1004     if (c == -1) {
1005       *nextTokPtr = ptr;
1006       return 0;
1007     }
1008     if (c == ASCII_EQUALS) {
1009       *nameEndPtr = ptr;
1010       break;
1011     }
1012     if (isSpace(c)) {
1013       *nameEndPtr = ptr;
1014       do {
1015         ptr += enc->minBytesPerChar;
1016       } while (isSpace(c = toAscii(enc, ptr, end)));
1017       if (c != ASCII_EQUALS) {
1018         *nextTokPtr = ptr;
1019         return 0;
1020       }
1021       break;
1022     }
1023     ptr += enc->minBytesPerChar;
1024   }
1025   if (ptr == *namePtr) {
1026     *nextTokPtr = ptr;
1027     return 0;
1028   }
1029   ptr += enc->minBytesPerChar;
1030   c = toAscii(enc, ptr, end);
1031   while (isSpace(c)) {
1032     ptr += enc->minBytesPerChar;
1033     c = toAscii(enc, ptr, end);
1034   }
1035   if (c != ASCII_QUOT && c != ASCII_APOS) {
1036     *nextTokPtr = ptr;
1037     return 0;
1038   }
1039   open = (char)c;
1040   ptr += enc->minBytesPerChar;
1041   *valPtr = ptr;
1042   for (;; ptr += enc->minBytesPerChar) {
1043     c = toAscii(enc, ptr, end);
1044     if (c == open)
1045       break;
1046     if (!(ASCII_a <= c && c <= ASCII_z)
1047         && !(ASCII_A <= c && c <= ASCII_Z)
1048         && !(ASCII_0 <= c && c <= ASCII_9)
1049         && c != ASCII_PERIOD
1050         && c != ASCII_MINUS
1051         && c != ASCII_UNDERSCORE) {
1052       *nextTokPtr = ptr;
1053       return 0;
1054     }
1055   }
1056   *nextTokPtr = ptr + enc->minBytesPerChar;
1057   return 1;
1058 }
1059 
1060 static const char KW_version[] = {
1061   ASCII_v, ASCII_e, ASCII_r, ASCII_s, ASCII_i, ASCII_o, ASCII_n, '\0'
1062 };
1063 
1064 static const char KW_encoding[] = {
1065   ASCII_e, ASCII_n, ASCII_c, ASCII_o, ASCII_d, ASCII_i, ASCII_n, ASCII_g, '\0'
1066 };
1067 
1068 static const char KW_standalone[] = {
1069   ASCII_s, ASCII_t, ASCII_a, ASCII_n, ASCII_d, ASCII_a, ASCII_l, ASCII_o,
1070   ASCII_n, ASCII_e, '\0'
1071 };
1072 
1073 static const char KW_yes[] = {
1074   ASCII_y, ASCII_e, ASCII_s,  '\0'
1075 };
1076 
1077 static const char KW_no[] = {
1078   ASCII_n, ASCII_o,  '\0'
1079 };
1080 
1081 static int
doParseXmlDecl(const ENCODING * (* encodingFinder)(const ENCODING *,const char *,const char *),int isGeneralTextEntity,const ENCODING * enc,const char * ptr,const char * end,const char ** badPtr,const char ** versionPtr,const char ** versionEndPtr,const char ** encodingName,const ENCODING ** encoding,int * standalone)1082 doParseXmlDecl(const ENCODING *(*encodingFinder)(const ENCODING *,
1083                                                  const char *,
1084                                                  const char *),
1085                int isGeneralTextEntity,
1086                const ENCODING *enc,
1087                const char *ptr,
1088                const char *end,
1089                const char **badPtr,
1090                const char **versionPtr,
1091                const char **versionEndPtr,
1092                const char **encodingName,
1093                const ENCODING **encoding,
1094                int *standalone)
1095 {
1096   const char *val = NULL;
1097   const char *name = NULL;
1098   const char *nameEnd = NULL;
1099   ptr += 5 * enc->minBytesPerChar;
1100   end -= 2 * enc->minBytesPerChar;
1101   if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)
1102       || !name) {
1103     *badPtr = ptr;
1104     return 0;
1105   }
1106   if (!XmlNameMatchesAscii(enc, name, nameEnd, KW_version)) {
1107     if (!isGeneralTextEntity) {
1108       *badPtr = name;
1109       return 0;
1110     }
1111   }
1112   else {
1113     if (versionPtr)
1114       *versionPtr = val;
1115     if (versionEndPtr)
1116       *versionEndPtr = ptr;
1117     if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)) {
1118       *badPtr = ptr;
1119       return 0;
1120     }
1121     if (!name) {
1122       if (isGeneralTextEntity) {
1123         /* a TextDecl must have an EncodingDecl */
1124         *badPtr = ptr;
1125         return 0;
1126       }
1127       return 1;
1128     }
1129   }
1130   if (XmlNameMatchesAscii(enc, name, nameEnd, KW_encoding)) {
1131     int c = toAscii(enc, val, end);
1132     if (!(ASCII_a <= c && c <= ASCII_z) && !(ASCII_A <= c && c <= ASCII_Z)) {
1133       *badPtr = val;
1134       return 0;
1135     }
1136     if (encodingName)
1137       *encodingName = val;
1138     if (encoding)
1139       *encoding = encodingFinder(enc, val, ptr - enc->minBytesPerChar);
1140     if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)) {
1141       *badPtr = ptr;
1142       return 0;
1143     }
1144     if (!name)
1145       return 1;
1146   }
1147   if (!XmlNameMatchesAscii(enc, name, nameEnd, KW_standalone)
1148       || isGeneralTextEntity) {
1149     *badPtr = name;
1150     return 0;
1151   }
1152   if (XmlNameMatchesAscii(enc, val, ptr - enc->minBytesPerChar, KW_yes)) {
1153     if (standalone)
1154       *standalone = 1;
1155   }
1156   else if (XmlNameMatchesAscii(enc, val, ptr - enc->minBytesPerChar, KW_no)) {
1157     if (standalone)
1158       *standalone = 0;
1159   }
1160   else {
1161     *badPtr = val;
1162     return 0;
1163   }
1164   while (isSpace(toAscii(enc, ptr, end)))
1165     ptr += enc->minBytesPerChar;
1166   if (ptr != end) {
1167     *badPtr = ptr;
1168     return 0;
1169   }
1170   return 1;
1171 }
1172 
1173 static int FASTCALL
checkCharRefNumber(int result)1174 checkCharRefNumber(int result)
1175 {
1176   switch (result >> 8) {
1177   case 0xD8: case 0xD9: case 0xDA: case 0xDB:
1178   case 0xDC: case 0xDD: case 0xDE: case 0xDF:
1179     return -1;
1180   case 0:
1181     if (latin1_encoding.type[result] == BT_NONXML)
1182       return -1;
1183     break;
1184   case 0xFF:
1185     if (result == 0xFFFE || result == 0xFFFF)
1186       return -1;
1187     break;
1188   }
1189   return result;
1190 }
1191 
1192 int FASTCALL
XmlUtf8Encode(int c,char * buf)1193 XmlUtf8Encode(int c, char *buf)
1194 {
1195   enum {
1196     /* minN is minimum legal resulting value for N byte sequence */
1197     min2 = 0x80,
1198     min3 = 0x800,
1199     min4 = 0x10000
1200   };
1201 
1202   if (c < 0)
1203     return 0;
1204   if (c < min2) {
1205     buf[0] = (char)(c | UTF8_cval1);
1206     return 1;
1207   }
1208   if (c < min3) {
1209     buf[0] = (char)((c >> 6) | UTF8_cval2);
1210     buf[1] = (char)((c & 0x3f) | 0x80);
1211     return 2;
1212   }
1213   if (c < min4) {
1214     buf[0] = (char)((c >> 12) | UTF8_cval3);
1215     buf[1] = (char)(((c >> 6) & 0x3f) | 0x80);
1216     buf[2] = (char)((c & 0x3f) | 0x80);
1217     return 3;
1218   }
1219   if (c < 0x110000) {
1220     buf[0] = (char)((c >> 18) | UTF8_cval4);
1221     buf[1] = (char)(((c >> 12) & 0x3f) | 0x80);
1222     buf[2] = (char)(((c >> 6) & 0x3f) | 0x80);
1223     buf[3] = (char)((c & 0x3f) | 0x80);
1224     return 4;
1225   }
1226   return 0;
1227 }
1228 
1229 int FASTCALL
XmlUtf16Encode(int charNum,unsigned short * buf)1230 XmlUtf16Encode(int charNum, unsigned short *buf)
1231 {
1232   if (charNum < 0)
1233     return 0;
1234   if (charNum < 0x10000) {
1235     buf[0] = (unsigned short)charNum;
1236     return 1;
1237   }
1238   if (charNum < 0x110000) {
1239     charNum -= 0x10000;
1240     buf[0] = (unsigned short)((charNum >> 10) + 0xD800);
1241     buf[1] = (unsigned short)((charNum & 0x3FF) + 0xDC00);
1242     return 2;
1243   }
1244   return 0;
1245 }
1246 
1247 struct unknown_encoding {
1248   struct normal_encoding normal;
1249   CONVERTER convert;
1250   void *userData;
1251   unsigned short utf16[256];
1252   char utf8[256][4];
1253 };
1254 
1255 #define AS_UNKNOWN_ENCODING(enc)  ((const struct unknown_encoding *) (enc))
1256 
1257 int
XmlSizeOfUnknownEncoding(void)1258 XmlSizeOfUnknownEncoding(void)
1259 {
1260   return sizeof(struct unknown_encoding);
1261 }
1262 
1263 static int PTRFASTCALL
unknown_isName(const ENCODING * enc,const char * p)1264 unknown_isName(const ENCODING *enc, const char *p)
1265 {
1266   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1267   int c = uenc->convert(uenc->userData, p);
1268   if (c & ~0xFFFF)
1269     return 0;
1270   return UCS2_GET_NAMING(namePages, c >> 8, c & 0xFF);
1271 }
1272 
1273 static int PTRFASTCALL
unknown_isNmstrt(const ENCODING * enc,const char * p)1274 unknown_isNmstrt(const ENCODING *enc, const char *p)
1275 {
1276   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1277   int c = uenc->convert(uenc->userData, p);
1278   if (c & ~0xFFFF)
1279     return 0;
1280   return UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xFF);
1281 }
1282 
1283 static int PTRFASTCALL
unknown_isInvalid(const ENCODING * enc,const char * p)1284 unknown_isInvalid(const ENCODING *enc, const char *p)
1285 {
1286   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1287   int c = uenc->convert(uenc->userData, p);
1288   return (c & ~0xFFFF) || checkCharRefNumber(c) < 0;
1289 }
1290 
1291 static void PTRCALL
unknown_toUtf8(const ENCODING * enc,const char ** fromP,const char * fromLim,char ** toP,const char * toLim)1292 unknown_toUtf8(const ENCODING *enc,
1293                const char **fromP, const char *fromLim,
1294                char **toP, const char *toLim)
1295 {
1296   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1297   char buf[XML_UTF8_ENCODE_MAX];
1298   for (;;) {
1299     const char *utf8;
1300     int n;
1301     if (*fromP == fromLim)
1302       break;
1303     utf8 = uenc->utf8[(unsigned char)**fromP];
1304     n = *utf8++;
1305     if (n == 0) {
1306       int c = uenc->convert(uenc->userData, *fromP);
1307       n = XmlUtf8Encode(c, buf);
1308       if (n > toLim - *toP)
1309         break;
1310       utf8 = buf;
1311       *fromP += (AS_NORMAL_ENCODING(enc)->type[(unsigned char)**fromP]
1312                  - (BT_LEAD2 - 2));
1313     }
1314     else {
1315       if (n > toLim - *toP)
1316         break;
1317       (*fromP)++;
1318     }
1319     do {
1320       *(*toP)++ = *utf8++;
1321     } while (--n != 0);
1322   }
1323 }
1324 
1325 static void PTRCALL
unknown_toUtf16(const ENCODING * enc,const char ** fromP,const char * fromLim,unsigned short ** toP,const unsigned short * toLim)1326 unknown_toUtf16(const ENCODING *enc,
1327                 const char **fromP, const char *fromLim,
1328                 unsigned short **toP, const unsigned short *toLim)
1329 {
1330   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1331   while (*fromP != fromLim && *toP != toLim) {
1332     unsigned short c = uenc->utf16[(unsigned char)**fromP];
1333     if (c == 0) {
1334       c = (unsigned short)
1335           uenc->convert(uenc->userData, *fromP);
1336       *fromP += (AS_NORMAL_ENCODING(enc)->type[(unsigned char)**fromP]
1337                  - (BT_LEAD2 - 2));
1338     }
1339     else
1340       (*fromP)++;
1341     *(*toP)++ = c;
1342   }
1343 }
1344 
1345 ENCODING *
XmlInitUnknownEncoding(void * mem,int * table,CONVERTER convert,void * userData)1346 XmlInitUnknownEncoding(void *mem,
1347                        int *table,
1348                        CONVERTER convert,
1349                        void *userData)
1350 {
1351   int i;
1352   struct unknown_encoding *e = (struct unknown_encoding *)mem;
1353   for (i = 0; i < (int)sizeof(struct normal_encoding); i++)
1354     ((char *)mem)[i] = ((char *)&latin1_encoding)[i];
1355   for (i = 0; i < 128; i++)
1356     if (latin1_encoding.type[i] != BT_OTHER
1357         && latin1_encoding.type[i] != BT_NONXML
1358         && table[i] != i)
1359       return 0;
1360   for (i = 0; i < 256; i++) {
1361     int c = table[i];
1362     if (c == -1) {
1363       e->normal.type[i] = BT_MALFORM;
1364       /* This shouldn't really get used. */
1365       e->utf16[i] = 0xFFFF;
1366       e->utf8[i][0] = 1;
1367       e->utf8[i][1] = 0;
1368     }
1369     else if (c < 0) {
1370       if (c < -4)
1371         return 0;
1372       e->normal.type[i] = (unsigned char)(BT_LEAD2 - (c + 2));
1373       e->utf8[i][0] = 0;
1374       e->utf16[i] = 0;
1375     }
1376     else if (c < 0x80) {
1377       if (latin1_encoding.type[c] != BT_OTHER
1378           && latin1_encoding.type[c] != BT_NONXML
1379           && c != i)
1380         return 0;
1381       e->normal.type[i] = latin1_encoding.type[c];
1382       e->utf8[i][0] = 1;
1383       e->utf8[i][1] = (char)c;
1384       e->utf16[i] = (unsigned short)(c == 0 ? 0xFFFF : c);
1385     }
1386     else if (checkCharRefNumber(c) < 0) {
1387       e->normal.type[i] = BT_NONXML;
1388       /* This shouldn't really get used. */
1389       e->utf16[i] = 0xFFFF;
1390       e->utf8[i][0] = 1;
1391       e->utf8[i][1] = 0;
1392     }
1393     else {
1394       if (c > 0xFFFF)
1395         return 0;
1396       if (UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xff))
1397         e->normal.type[i] = BT_NMSTRT;
1398       else if (UCS2_GET_NAMING(namePages, c >> 8, c & 0xff))
1399         e->normal.type[i] = BT_NAME;
1400       else
1401         e->normal.type[i] = BT_OTHER;
1402       e->utf8[i][0] = (char)XmlUtf8Encode(c, e->utf8[i] + 1);
1403       e->utf16[i] = (unsigned short)c;
1404     }
1405   }
1406   e->userData = userData;
1407   e->convert = convert;
1408   if (convert) {
1409     e->normal.isName2 = unknown_isName;
1410     e->normal.isName3 = unknown_isName;
1411     e->normal.isName4 = unknown_isName;
1412     e->normal.isNmstrt2 = unknown_isNmstrt;
1413     e->normal.isNmstrt3 = unknown_isNmstrt;
1414     e->normal.isNmstrt4 = unknown_isNmstrt;
1415     e->normal.isInvalid2 = unknown_isInvalid;
1416     e->normal.isInvalid3 = unknown_isInvalid;
1417     e->normal.isInvalid4 = unknown_isInvalid;
1418   }
1419   e->normal.enc.utf8Convert = unknown_toUtf8;
1420   e->normal.enc.utf16Convert = unknown_toUtf16;
1421   return &(e->normal.enc);
1422 }
1423 
1424 /* If this enumeration is changed, getEncodingIndex and encodings
1425 must also be changed. */
1426 enum {
1427   UNKNOWN_ENC = -1,
1428   ISO_8859_1_ENC = 0,
1429   US_ASCII_ENC,
1430   UTF_8_ENC,
1431   UTF_16_ENC,
1432   UTF_16BE_ENC,
1433   UTF_16LE_ENC,
1434   /* must match encodingNames up to here */
1435   NO_ENC
1436 };
1437 
1438 static const char KW_ISO_8859_1[] = {
1439   ASCII_I, ASCII_S, ASCII_O, ASCII_MINUS, ASCII_8, ASCII_8, ASCII_5, ASCII_9,
1440   ASCII_MINUS, ASCII_1, '\0'
1441 };
1442 static const char KW_US_ASCII[] = {
1443   ASCII_U, ASCII_S, ASCII_MINUS, ASCII_A, ASCII_S, ASCII_C, ASCII_I, ASCII_I,
1444   '\0'
1445 };
1446 static const char KW_UTF_8[] =  {
1447   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_8, '\0'
1448 };
1449 static const char KW_UTF_16[] = {
1450   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, '\0'
1451 };
1452 static const char KW_UTF_16BE[] = {
1453   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, ASCII_B, ASCII_E,
1454   '\0'
1455 };
1456 static const char KW_UTF_16LE[] = {
1457   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, ASCII_L, ASCII_E,
1458   '\0'
1459 };
1460 
1461 static int FASTCALL
getEncodingIndex(const char * name)1462 getEncodingIndex(const char *name)
1463 {
1464   static const char * const encodingNames[] = {
1465     KW_ISO_8859_1,
1466     KW_US_ASCII,
1467     KW_UTF_8,
1468     KW_UTF_16,
1469     KW_UTF_16BE,
1470     KW_UTF_16LE,
1471   };
1472   int i;
1473   if (name == NULL)
1474     return NO_ENC;
1475   for (i = 0; i < (int)(sizeof(encodingNames)/sizeof(encodingNames[0])); i++)
1476     if (streqci(name, encodingNames[i]))
1477       return i;
1478   return UNKNOWN_ENC;
1479 }
1480 
1481 /* For binary compatibility, we store the index of the encoding
1482    specified at initialization in the isUtf16 member.
1483 */
1484 
1485 #define INIT_ENC_INDEX(enc) ((int)(enc)->initEnc.isUtf16)
1486 #define SET_INIT_ENC_INDEX(enc, i) ((enc)->initEnc.isUtf16 = (char)i)
1487 
1488 /* This is what detects the encoding.  encodingTable maps from
1489    encoding indices to encodings; INIT_ENC_INDEX(enc) is the index of
1490    the external (protocol) specified encoding; state is
1491    XML_CONTENT_STATE if we're parsing an external text entity, and
1492    XML_PROLOG_STATE otherwise.
1493 */
1494 
1495 
1496 static int
initScan(const ENCODING * const * encodingTable,const INIT_ENCODING * enc,int state,const char * ptr,const char * end,const char ** nextTokPtr)1497 initScan(const ENCODING * const *encodingTable,
1498          const INIT_ENCODING *enc,
1499          int state,
1500          const char *ptr,
1501          const char *end,
1502          const char **nextTokPtr)
1503 {
1504   const ENCODING **encPtr;
1505 
1506   if (ptr == end)
1507     return XML_TOK_NONE;
1508   encPtr = enc->encPtr;
1509   if (ptr + 1 == end) {
1510     /* only a single byte available for auto-detection */
1511 #ifndef XML_DTD /* FIXME */
1512     /* a well-formed document entity must have more than one byte */
1513     if (state != XML_CONTENT_STATE)
1514       return XML_TOK_PARTIAL;
1515 #endif
1516     /* so we're parsing an external text entity... */
1517     /* if UTF-16 was externally specified, then we need at least 2 bytes */
1518     switch (INIT_ENC_INDEX(enc)) {
1519     case UTF_16_ENC:
1520     case UTF_16LE_ENC:
1521     case UTF_16BE_ENC:
1522       return XML_TOK_PARTIAL;
1523     }
1524     switch ((unsigned char)*ptr) {
1525     case 0xFE:
1526     case 0xFF:
1527     case 0xEF: /* possibly first byte of UTF-8 BOM */
1528       if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
1529           && state == XML_CONTENT_STATE)
1530         break;
1531       /* fall through */
1532     case 0x00:
1533     case 0x3C:
1534       return XML_TOK_PARTIAL;
1535     }
1536   }
1537   else {
1538     switch (((unsigned char)ptr[0] << 8) | (unsigned char)ptr[1]) {
1539     case 0xFEFF:
1540       if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
1541           && state == XML_CONTENT_STATE)
1542         break;
1543       *nextTokPtr = ptr + 2;
1544       *encPtr = encodingTable[UTF_16BE_ENC];
1545       return XML_TOK_BOM;
1546     /* 00 3C is handled in the default case */
1547     case 0x3C00:
1548       if ((INIT_ENC_INDEX(enc) == UTF_16BE_ENC
1549            || INIT_ENC_INDEX(enc) == UTF_16_ENC)
1550           && state == XML_CONTENT_STATE)
1551         break;
1552       *encPtr = encodingTable[UTF_16LE_ENC];
1553       return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1554     case 0xFFFE:
1555       if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
1556           && state == XML_CONTENT_STATE)
1557         break;
1558       *nextTokPtr = ptr + 2;
1559       *encPtr = encodingTable[UTF_16LE_ENC];
1560       return XML_TOK_BOM;
1561     case 0xEFBB:
1562       /* Maybe a UTF-8 BOM (EF BB BF) */
1563       /* If there's an explicitly specified (external) encoding
1564          of ISO-8859-1 or some flavour of UTF-16
1565          and this is an external text entity,
1566          don't look for the BOM,
1567          because it might be a legal data.
1568       */
1569       if (state == XML_CONTENT_STATE) {
1570         int e = INIT_ENC_INDEX(enc);
1571         if (e == ISO_8859_1_ENC || e == UTF_16BE_ENC
1572             || e == UTF_16LE_ENC || e == UTF_16_ENC)
1573           break;
1574       }
1575       if (ptr + 2 == end)
1576         return XML_TOK_PARTIAL;
1577       if ((unsigned char)ptr[2] == 0xBF) {
1578         *nextTokPtr = ptr + 3;
1579         *encPtr = encodingTable[UTF_8_ENC];
1580         return XML_TOK_BOM;
1581       }
1582       break;
1583     default:
1584       if (ptr[0] == '\0') {
1585         /* 0 isn't a legal data character. Furthermore a document
1586            entity can only start with ASCII characters.  So the only
1587            way this can fail to be big-endian UTF-16 if it it's an
1588            external parsed general entity that's labelled as
1589            UTF-16LE.
1590         */
1591         if (state == XML_CONTENT_STATE && INIT_ENC_INDEX(enc) == UTF_16LE_ENC)
1592           break;
1593         *encPtr = encodingTable[UTF_16BE_ENC];
1594         return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1595       }
1596       else if (ptr[1] == '\0') {
1597         /* We could recover here in the case:
1598             - parsing an external entity
1599             - second byte is 0
1600             - no externally specified encoding
1601             - no encoding declaration
1602            by assuming UTF-16LE.  But we don't, because this would mean when
1603            presented just with a single byte, we couldn't reliably determine
1604            whether we needed further bytes.
1605         */
1606         if (state == XML_CONTENT_STATE)
1607           break;
1608         *encPtr = encodingTable[UTF_16LE_ENC];
1609         return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1610       }
1611       break;
1612     }
1613   }
1614   *encPtr = encodingTable[INIT_ENC_INDEX(enc)];
1615   return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1616 }
1617 
1618 
1619 #define NS(x) x
1620 #define ns(x) x
1621 #define XML_TOK_NS_C
1622 #include "xmltok_ns.c"
1623 #undef XML_TOK_NS_C
1624 #undef NS
1625 #undef ns
1626 
1627 #ifdef XML_NS
1628 
1629 #define NS(x) x ## NS
1630 #define ns(x) x ## _ns
1631 
1632 #define XML_TOK_NS_C
1633 #include "xmltok_ns.c"
1634 #undef XML_TOK_NS_C
1635 
1636 #undef NS
1637 #undef ns
1638 
1639 ENCODING *
XmlInitUnknownEncodingNS(void * mem,int * table,CONVERTER convert,void * userData)1640 XmlInitUnknownEncodingNS(void *mem,
1641                          int *table,
1642                          CONVERTER convert,
1643                          void *userData)
1644 {
1645   ENCODING *enc = XmlInitUnknownEncoding(mem, table, convert, userData);
1646   if (enc)
1647     ((struct normal_encoding *)enc)->type[ASCII_COLON] = BT_COLON;
1648   return enc;
1649 }
1650 
1651 #endif /* XML_NS */
1652