xref: /freebsd/contrib/expat/lib/xmltok.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
2    See the file COPYING for copying permission.
3 */
4 
5 #ifdef COMPILED_FROM_DSP
6 #include "winconfig.h"
7 #elif defined(MACOS_CLASSIC)
8 #include "macconfig.h"
9 #else
10 #include <expat_config.h>
11 #endif /* ndef COMPILED_FROM_DSP */
12 
13 #include "internal.h"
14 #include "xmltok.h"
15 #include "nametab.h"
16 
17 #ifdef XML_DTD
18 #define IGNORE_SECTION_TOK_VTABLE , PREFIX(ignoreSectionTok)
19 #else
20 #define IGNORE_SECTION_TOK_VTABLE /* as nothing */
21 #endif
22 
23 #define VTABLE1 \
24   { PREFIX(prologTok), PREFIX(contentTok), \
25     PREFIX(cdataSectionTok) IGNORE_SECTION_TOK_VTABLE }, \
26   { PREFIX(attributeValueTok), PREFIX(entityValueTok) }, \
27   PREFIX(sameName), \
28   PREFIX(nameMatchesAscii), \
29   PREFIX(nameLength), \
30   PREFIX(skipS), \
31   PREFIX(getAtts), \
32   PREFIX(charRefNumber), \
33   PREFIX(predefinedEntityName), \
34   PREFIX(updatePosition), \
35   PREFIX(isPublicId)
36 
37 #define VTABLE VTABLE1, PREFIX(toUtf8), PREFIX(toUtf16)
38 
39 #define UCS2_GET_NAMING(pages, hi, lo) \
40    (namingBitmap[(pages[hi] << 3) + ((lo) >> 5)] & (1 << ((lo) & 0x1F)))
41 
42 /* A 2 byte UTF-8 representation splits the characters 11 bits between
43    the bottom 5 and 6 bits of the bytes.  We need 8 bits to index into
44    pages, 3 bits to add to that index and 5 bits to generate the mask.
45 */
46 #define UTF8_GET_NAMING2(pages, byte) \
47     (namingBitmap[((pages)[(((byte)[0]) >> 2) & 7] << 3) \
48                       + ((((byte)[0]) & 3) << 1) \
49                       + ((((byte)[1]) >> 5) & 1)] \
50          & (1 << (((byte)[1]) & 0x1F)))
51 
52 /* A 3 byte UTF-8 representation splits the characters 16 bits between
53    the bottom 4, 6 and 6 bits of the bytes.  We need 8 bits to index
54    into pages, 3 bits to add to that index and 5 bits to generate the
55    mask.
56 */
57 #define UTF8_GET_NAMING3(pages, byte) \
58   (namingBitmap[((pages)[((((byte)[0]) & 0xF) << 4) \
59                              + ((((byte)[1]) >> 2) & 0xF)] \
60                        << 3) \
61                       + ((((byte)[1]) & 3) << 1) \
62                       + ((((byte)[2]) >> 5) & 1)] \
63          & (1 << (((byte)[2]) & 0x1F)))
64 
65 #define UTF8_GET_NAMING(pages, p, n) \
66   ((n) == 2 \
67   ? UTF8_GET_NAMING2(pages, (const unsigned char *)(p)) \
68   : ((n) == 3 \
69      ? UTF8_GET_NAMING3(pages, (const unsigned char *)(p)) \
70      : 0))
71 
72 /* Detection of invalid UTF-8 sequences is based on Table 3.1B
73    of Unicode 3.2: http://www.unicode.org/unicode/reports/tr28/
74    with the additional restriction of not allowing the Unicode
75    code points 0xFFFF and 0xFFFE (sequences EF,BF,BF and EF,BF,BE).
76    Implementation details:
77      (A & 0x80) == 0     means A < 0x80
78    and
79      (A & 0xC0) == 0xC0  means A > 0xBF
80 */
81 
82 #define UTF8_INVALID2(p) \
83   ((*p) < 0xC2 || ((p)[1] & 0x80) == 0 || ((p)[1] & 0xC0) == 0xC0)
84 
85 #define UTF8_INVALID3(p) \
86   (((p)[2] & 0x80) == 0 \
87   || \
88   ((*p) == 0xEF && (p)[1] == 0xBF \
89     ? \
90     (p)[2] > 0xBD \
91     : \
92     ((p)[2] & 0xC0) == 0xC0) \
93   || \
94   ((*p) == 0xE0 \
95     ? \
96     (p)[1] < 0xA0 || ((p)[1] & 0xC0) == 0xC0 \
97     : \
98     ((p)[1] & 0x80) == 0 \
99     || \
100     ((*p) == 0xED ? (p)[1] > 0x9F : ((p)[1] & 0xC0) == 0xC0)))
101 
102 #define UTF8_INVALID4(p) \
103   (((p)[3] & 0x80) == 0 || ((p)[3] & 0xC0) == 0xC0 \
104   || \
105   ((p)[2] & 0x80) == 0 || ((p)[2] & 0xC0) == 0xC0 \
106   || \
107   ((*p) == 0xF0 \
108     ? \
109     (p)[1] < 0x90 || ((p)[1] & 0xC0) == 0xC0 \
110     : \
111     ((p)[1] & 0x80) == 0 \
112     || \
113     ((*p) == 0xF4 ? (p)[1] > 0x8F : ((p)[1] & 0xC0) == 0xC0)))
114 
115 static int FASTCALL
116 isNever(const ENCODING *enc, const char *p)
117 {
118   return 0;
119 }
120 
121 static int FASTCALL
122 utf8_isName2(const ENCODING *enc, const char *p)
123 {
124   return UTF8_GET_NAMING2(namePages, (const unsigned char *)p);
125 }
126 
127 static int FASTCALL
128 utf8_isName3(const ENCODING *enc, const char *p)
129 {
130   return UTF8_GET_NAMING3(namePages, (const unsigned char *)p);
131 }
132 
133 #define utf8_isName4 isNever
134 
135 static int FASTCALL
136 utf8_isNmstrt2(const ENCODING *enc, const char *p)
137 {
138   return UTF8_GET_NAMING2(nmstrtPages, (const unsigned char *)p);
139 }
140 
141 static int FASTCALL
142 utf8_isNmstrt3(const ENCODING *enc, const char *p)
143 {
144   return UTF8_GET_NAMING3(nmstrtPages, (const unsigned char *)p);
145 }
146 
147 #define utf8_isNmstrt4 isNever
148 
149 static int FASTCALL
150 utf8_isInvalid2(const ENCODING *enc, const char *p)
151 {
152   return UTF8_INVALID2((const unsigned char *)p);
153 }
154 
155 static int FASTCALL
156 utf8_isInvalid3(const ENCODING *enc, const char *p)
157 {
158   return UTF8_INVALID3((const unsigned char *)p);
159 }
160 
161 static int FASTCALL
162 utf8_isInvalid4(const ENCODING *enc, const char *p)
163 {
164   return UTF8_INVALID4((const unsigned char *)p);
165 }
166 
167 struct normal_encoding {
168   ENCODING enc;
169   unsigned char type[256];
170 #ifdef XML_MIN_SIZE
171   int (FASTCALL *byteType)(const ENCODING *, const char *);
172   int (FASTCALL *isNameMin)(const ENCODING *, const char *);
173   int (FASTCALL *isNmstrtMin)(const ENCODING *, const char *);
174   int (FASTCALL *byteToAscii)(const ENCODING *, const char *);
175   int (FASTCALL *charMatches)(const ENCODING *, const char *, int);
176 #endif /* XML_MIN_SIZE */
177   int (FASTCALL *isName2)(const ENCODING *, const char *);
178   int (FASTCALL *isName3)(const ENCODING *, const char *);
179   int (FASTCALL *isName4)(const ENCODING *, const char *);
180   int (FASTCALL *isNmstrt2)(const ENCODING *, const char *);
181   int (FASTCALL *isNmstrt3)(const ENCODING *, const char *);
182   int (FASTCALL *isNmstrt4)(const ENCODING *, const char *);
183   int (FASTCALL *isInvalid2)(const ENCODING *, const char *);
184   int (FASTCALL *isInvalid3)(const ENCODING *, const char *);
185   int (FASTCALL *isInvalid4)(const ENCODING *, const char *);
186 };
187 
188 #define AS_NORMAL_ENCODING(enc)   ((const struct normal_encoding *) (enc))
189 
190 #ifdef XML_MIN_SIZE
191 
192 #define STANDARD_VTABLE(E) \
193  E ## byteType, \
194  E ## isNameMin, \
195  E ## isNmstrtMin, \
196  E ## byteToAscii, \
197  E ## charMatches,
198 
199 #else
200 
201 #define STANDARD_VTABLE(E) /* as nothing */
202 
203 #endif
204 
205 #define NORMAL_VTABLE(E) \
206  E ## isName2, \
207  E ## isName3, \
208  E ## isName4, \
209  E ## isNmstrt2, \
210  E ## isNmstrt3, \
211  E ## isNmstrt4, \
212  E ## isInvalid2, \
213  E ## isInvalid3, \
214  E ## isInvalid4
215 
216 static int FASTCALL checkCharRefNumber(int);
217 
218 #include "xmltok_impl.h"
219 #include "ascii.h"
220 
221 #ifdef XML_MIN_SIZE
222 #define sb_isNameMin isNever
223 #define sb_isNmstrtMin isNever
224 #endif
225 
226 #ifdef XML_MIN_SIZE
227 #define MINBPC(enc) ((enc)->minBytesPerChar)
228 #else
229 /* minimum bytes per character */
230 #define MINBPC(enc) 1
231 #endif
232 
233 #define SB_BYTE_TYPE(enc, p) \
234   (((struct normal_encoding *)(enc))->type[(unsigned char)*(p)])
235 
236 #ifdef XML_MIN_SIZE
237 static int FASTCALL
238 sb_byteType(const ENCODING *enc, const char *p)
239 {
240   return SB_BYTE_TYPE(enc, p);
241 }
242 #define BYTE_TYPE(enc, p) \
243  (AS_NORMAL_ENCODING(enc)->byteType(enc, p))
244 #else
245 #define BYTE_TYPE(enc, p) SB_BYTE_TYPE(enc, p)
246 #endif
247 
248 #ifdef XML_MIN_SIZE
249 #define BYTE_TO_ASCII(enc, p) \
250  (AS_NORMAL_ENCODING(enc)->byteToAscii(enc, p))
251 static int FASTCALL
252 sb_byteToAscii(const ENCODING *enc, const char *p)
253 {
254   return *p;
255 }
256 #else
257 #define BYTE_TO_ASCII(enc, p) (*(p))
258 #endif
259 
260 #define IS_NAME_CHAR(enc, p, n) \
261  (AS_NORMAL_ENCODING(enc)->isName ## n(enc, p))
262 #define IS_NMSTRT_CHAR(enc, p, n) \
263  (AS_NORMAL_ENCODING(enc)->isNmstrt ## n(enc, p))
264 #define IS_INVALID_CHAR(enc, p, n) \
265  (AS_NORMAL_ENCODING(enc)->isInvalid ## n(enc, p))
266 
267 #ifdef XML_MIN_SIZE
268 #define IS_NAME_CHAR_MINBPC(enc, p) \
269  (AS_NORMAL_ENCODING(enc)->isNameMin(enc, p))
270 #define IS_NMSTRT_CHAR_MINBPC(enc, p) \
271  (AS_NORMAL_ENCODING(enc)->isNmstrtMin(enc, p))
272 #else
273 #define IS_NAME_CHAR_MINBPC(enc, p) (0)
274 #define IS_NMSTRT_CHAR_MINBPC(enc, p) (0)
275 #endif
276 
277 #ifdef XML_MIN_SIZE
278 #define CHAR_MATCHES(enc, p, c) \
279  (AS_NORMAL_ENCODING(enc)->charMatches(enc, p, c))
280 static int FASTCALL
281 sb_charMatches(const ENCODING *enc, const char *p, int c)
282 {
283   return *p == c;
284 }
285 #else
286 /* c is an ASCII character */
287 #define CHAR_MATCHES(enc, p, c) (*(p) == c)
288 #endif
289 
290 #define PREFIX(ident) normal_ ## ident
291 #include "xmltok_impl.c"
292 
293 #undef MINBPC
294 #undef BYTE_TYPE
295 #undef BYTE_TO_ASCII
296 #undef CHAR_MATCHES
297 #undef IS_NAME_CHAR
298 #undef IS_NAME_CHAR_MINBPC
299 #undef IS_NMSTRT_CHAR
300 #undef IS_NMSTRT_CHAR_MINBPC
301 #undef IS_INVALID_CHAR
302 
303 enum {  /* UTF8_cvalN is value of masked first byte of N byte sequence */
304   UTF8_cval1 = 0x00,
305   UTF8_cval2 = 0xc0,
306   UTF8_cval3 = 0xe0,
307   UTF8_cval4 = 0xf0
308 };
309 
310 static void FASTCALL
311 utf8_toUtf8(const ENCODING *enc,
312             const char **fromP, const char *fromLim,
313             char **toP, const char *toLim)
314 {
315   char *to;
316   const char *from;
317   if (fromLim - *fromP > toLim - *toP) {
318     /* Avoid copying partial characters. */
319     for (fromLim = *fromP + (toLim - *toP); fromLim > *fromP; fromLim--)
320       if (((unsigned char)fromLim[-1] & 0xc0) != 0x80)
321         break;
322   }
323   for (to = *toP, from = *fromP; from != fromLim; from++, to++)
324     *to = *from;
325   *fromP = from;
326   *toP = to;
327 }
328 
329 static void FASTCALL
330 utf8_toUtf16(const ENCODING *enc,
331              const char **fromP, const char *fromLim,
332              unsigned short **toP, const unsigned short *toLim)
333 {
334   unsigned short *to = *toP;
335   const char *from = *fromP;
336   while (from != fromLim && to != toLim) {
337     switch (((struct normal_encoding *)enc)->type[(unsigned char)*from]) {
338     case BT_LEAD2:
339       *to++ = (unsigned short)(((from[0] & 0x1f) << 6) | (from[1] & 0x3f));
340       from += 2;
341       break;
342     case BT_LEAD3:
343       *to++ = (unsigned short)(((from[0] & 0xf) << 12)
344                                | ((from[1] & 0x3f) << 6) | (from[2] & 0x3f));
345       from += 3;
346       break;
347     case BT_LEAD4:
348       {
349         unsigned long n;
350         if (to + 1 == toLim)
351           goto after;
352         n = ((from[0] & 0x7) << 18) | ((from[1] & 0x3f) << 12)
353             | ((from[2] & 0x3f) << 6) | (from[3] & 0x3f);
354         n -= 0x10000;
355         to[0] = (unsigned short)((n >> 10) | 0xD800);
356         to[1] = (unsigned short)((n & 0x3FF) | 0xDC00);
357         to += 2;
358         from += 4;
359       }
360       break;
361     default:
362       *to++ = *from++;
363       break;
364     }
365   }
366 after:
367   *fromP = from;
368   *toP = to;
369 }
370 
371 #ifdef XML_NS
372 static const struct normal_encoding utf8_encoding_ns = {
373   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
374   {
375 #include "asciitab.h"
376 #include "utf8tab.h"
377   },
378   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
379 };
380 #endif
381 
382 static const struct normal_encoding utf8_encoding = {
383   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
384   {
385 #define BT_COLON BT_NMSTRT
386 #include "asciitab.h"
387 #undef BT_COLON
388 #include "utf8tab.h"
389   },
390   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
391 };
392 
393 #ifdef XML_NS
394 
395 static const struct normal_encoding internal_utf8_encoding_ns = {
396   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
397   {
398 #include "iasciitab.h"
399 #include "utf8tab.h"
400   },
401   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
402 };
403 
404 #endif
405 
406 static const struct normal_encoding internal_utf8_encoding = {
407   { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },
408   {
409 #define BT_COLON BT_NMSTRT
410 #include "iasciitab.h"
411 #undef BT_COLON
412 #include "utf8tab.h"
413   },
414   STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)
415 };
416 
417 static void FASTCALL
418 latin1_toUtf8(const ENCODING *enc,
419               const char **fromP, const char *fromLim,
420               char **toP, const char *toLim)
421 {
422   for (;;) {
423     unsigned char c;
424     if (*fromP == fromLim)
425       break;
426     c = (unsigned char)**fromP;
427     if (c & 0x80) {
428       if (toLim - *toP < 2)
429         break;
430       *(*toP)++ = (char)((c >> 6) | UTF8_cval2);
431       *(*toP)++ = (char)((c & 0x3f) | 0x80);
432       (*fromP)++;
433     }
434     else {
435       if (*toP == toLim)
436         break;
437       *(*toP)++ = *(*fromP)++;
438     }
439   }
440 }
441 
442 static void FASTCALL
443 latin1_toUtf16(const ENCODING *enc,
444                const char **fromP, const char *fromLim,
445                unsigned short **toP, const unsigned short *toLim)
446 {
447   while (*fromP != fromLim && *toP != toLim)
448     *(*toP)++ = (unsigned char)*(*fromP)++;
449 }
450 
451 #ifdef XML_NS
452 
453 static const struct normal_encoding latin1_encoding_ns = {
454   { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },
455   {
456 #include "asciitab.h"
457 #include "latin1tab.h"
458   },
459   STANDARD_VTABLE(sb_)
460 };
461 
462 #endif
463 
464 static const struct normal_encoding latin1_encoding = {
465   { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },
466   {
467 #define BT_COLON BT_NMSTRT
468 #include "asciitab.h"
469 #undef BT_COLON
470 #include "latin1tab.h"
471   },
472   STANDARD_VTABLE(sb_)
473 };
474 
475 static void FASTCALL
476 ascii_toUtf8(const ENCODING *enc,
477              const char **fromP, const char *fromLim,
478              char **toP, const char *toLim)
479 {
480   while (*fromP != fromLim && *toP != toLim)
481     *(*toP)++ = *(*fromP)++;
482 }
483 
484 #ifdef XML_NS
485 
486 static const struct normal_encoding ascii_encoding_ns = {
487   { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },
488   {
489 #include "asciitab.h"
490 /* BT_NONXML == 0 */
491   },
492   STANDARD_VTABLE(sb_)
493 };
494 
495 #endif
496 
497 static const struct normal_encoding ascii_encoding = {
498   { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },
499   {
500 #define BT_COLON BT_NMSTRT
501 #include "asciitab.h"
502 #undef BT_COLON
503 /* BT_NONXML == 0 */
504   },
505   STANDARD_VTABLE(sb_)
506 };
507 
508 static int FASTCALL
509 unicode_byte_type(char hi, char lo)
510 {
511   switch ((unsigned char)hi) {
512   case 0xD8: case 0xD9: case 0xDA: case 0xDB:
513     return BT_LEAD4;
514   case 0xDC: case 0xDD: case 0xDE: case 0xDF:
515     return BT_TRAIL;
516   case 0xFF:
517     switch ((unsigned char)lo) {
518     case 0xFF:
519     case 0xFE:
520       return BT_NONXML;
521     }
522     break;
523   }
524   return BT_NONASCII;
525 }
526 
527 #define DEFINE_UTF16_TO_UTF8(E) \
528 static void  FASTCALL \
529 E ## toUtf8(const ENCODING *enc, \
530             const char **fromP, const char *fromLim, \
531             char **toP, const char *toLim) \
532 { \
533   const char *from; \
534   for (from = *fromP; from != fromLim; from += 2) { \
535     int plane; \
536     unsigned char lo2; \
537     unsigned char lo = GET_LO(from); \
538     unsigned char hi = GET_HI(from); \
539     switch (hi) { \
540     case 0: \
541       if (lo < 0x80) { \
542         if (*toP == toLim) { \
543           *fromP = from; \
544           return; \
545         } \
546         *(*toP)++ = lo; \
547         break; \
548       } \
549       /* fall through */ \
550     case 0x1: case 0x2: case 0x3: \
551     case 0x4: case 0x5: case 0x6: case 0x7: \
552       if (toLim -  *toP < 2) { \
553         *fromP = from; \
554         return; \
555       } \
556       *(*toP)++ = ((lo >> 6) | (hi << 2) |  UTF8_cval2); \
557       *(*toP)++ = ((lo & 0x3f) | 0x80); \
558       break; \
559     default: \
560       if (toLim -  *toP < 3)  { \
561         *fromP = from; \
562         return; \
563       } \
564       /* 16 bits divided 4, 6, 6 amongst 3 bytes */ \
565       *(*toP)++ = ((hi >> 4) | UTF8_cval3); \
566       *(*toP)++ = (((hi & 0xf) << 2) | (lo >> 6) | 0x80); \
567       *(*toP)++ = ((lo & 0x3f) | 0x80); \
568       break; \
569     case 0xD8: case 0xD9: case 0xDA: case 0xDB: \
570       if (toLim -  *toP < 4) { \
571         *fromP = from; \
572         return; \
573       } \
574       plane = (((hi & 0x3) << 2) | ((lo >> 6) & 0x3)) + 1; \
575       *(*toP)++ = ((plane >> 2) | UTF8_cval4); \
576       *(*toP)++ = (((lo >> 2) & 0xF) | ((plane & 0x3) << 4) | 0x80); \
577       from += 2; \
578       lo2 = GET_LO(from); \
579       *(*toP)++ = (((lo & 0x3) << 4) \
580                    | ((GET_HI(from) & 0x3) << 2) \
581                    | (lo2 >> 6) \
582                    | 0x80); \
583       *(*toP)++ = ((lo2 & 0x3f) | 0x80); \
584       break; \
585     } \
586   } \
587   *fromP = from; \
588 }
589 
590 #define DEFINE_UTF16_TO_UTF16(E) \
591 static void  FASTCALL \
592 E ## toUtf16(const ENCODING *enc, \
593              const char **fromP, const char *fromLim, \
594              unsigned short **toP, const unsigned short *toLim) \
595 { \
596   /* Avoid copying first half only of surrogate */ \
597   if (fromLim - *fromP > ((toLim - *toP) << 1) \
598       && (GET_HI(fromLim - 2) & 0xF8) == 0xD8) \
599     fromLim -= 2; \
600   for (; *fromP != fromLim && *toP != toLim; *fromP += 2) \
601     *(*toP)++ = (GET_HI(*fromP) << 8) | GET_LO(*fromP); \
602 }
603 
604 #define SET2(ptr, ch) \
605   (((ptr)[0] = ((ch) & 0xff)), ((ptr)[1] = ((ch) >> 8)))
606 #define GET_LO(ptr) ((unsigned char)(ptr)[0])
607 #define GET_HI(ptr) ((unsigned char)(ptr)[1])
608 
609 DEFINE_UTF16_TO_UTF8(little2_)
610 DEFINE_UTF16_TO_UTF16(little2_)
611 
612 #undef SET2
613 #undef GET_LO
614 #undef GET_HI
615 
616 #define SET2(ptr, ch) \
617   (((ptr)[0] = ((ch) >> 8)), ((ptr)[1] = ((ch) & 0xFF)))
618 #define GET_LO(ptr) ((unsigned char)(ptr)[1])
619 #define GET_HI(ptr) ((unsigned char)(ptr)[0])
620 
621 DEFINE_UTF16_TO_UTF8(big2_)
622 DEFINE_UTF16_TO_UTF16(big2_)
623 
624 #undef SET2
625 #undef GET_LO
626 #undef GET_HI
627 
628 #define LITTLE2_BYTE_TYPE(enc, p) \
629  ((p)[1] == 0 \
630   ? ((struct normal_encoding *)(enc))->type[(unsigned char)*(p)] \
631   : unicode_byte_type((p)[1], (p)[0]))
632 #define LITTLE2_BYTE_TO_ASCII(enc, p) ((p)[1] == 0 ? (p)[0] : -1)
633 #define LITTLE2_CHAR_MATCHES(enc, p, c) ((p)[1] == 0 && (p)[0] == c)
634 #define LITTLE2_IS_NAME_CHAR_MINBPC(enc, p) \
635   UCS2_GET_NAMING(namePages, (unsigned char)p[1], (unsigned char)p[0])
636 #define LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
637   UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[1], (unsigned char)p[0])
638 
639 #ifdef XML_MIN_SIZE
640 
641 static int FASTCALL
642 little2_byteType(const ENCODING *enc, const char *p)
643 {
644   return LITTLE2_BYTE_TYPE(enc, p);
645 }
646 
647 static int FASTCALL
648 little2_byteToAscii(const ENCODING *enc, const char *p)
649 {
650   return LITTLE2_BYTE_TO_ASCII(enc, p);
651 }
652 
653 static int FASTCALL
654 little2_charMatches(const ENCODING *enc, const char *p, int c)
655 {
656   return LITTLE2_CHAR_MATCHES(enc, p, c);
657 }
658 
659 static int FASTCALL
660 little2_isNameMin(const ENCODING *enc, const char *p)
661 {
662   return LITTLE2_IS_NAME_CHAR_MINBPC(enc, p);
663 }
664 
665 static int FASTCALL
666 little2_isNmstrtMin(const ENCODING *enc, const char *p)
667 {
668   return LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p);
669 }
670 
671 #undef VTABLE
672 #define VTABLE VTABLE1, little2_toUtf8, little2_toUtf16
673 
674 #else /* not XML_MIN_SIZE */
675 
676 #undef PREFIX
677 #define PREFIX(ident) little2_ ## ident
678 #define MINBPC(enc) 2
679 /* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
680 #define BYTE_TYPE(enc, p) LITTLE2_BYTE_TYPE(enc, p)
681 #define BYTE_TO_ASCII(enc, p) LITTLE2_BYTE_TO_ASCII(enc, p)
682 #define CHAR_MATCHES(enc, p, c) LITTLE2_CHAR_MATCHES(enc, p, c)
683 #define IS_NAME_CHAR(enc, p, n) 0
684 #define IS_NAME_CHAR_MINBPC(enc, p) LITTLE2_IS_NAME_CHAR_MINBPC(enc, p)
685 #define IS_NMSTRT_CHAR(enc, p, n) (0)
686 #define IS_NMSTRT_CHAR_MINBPC(enc, p) LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p)
687 
688 #include "xmltok_impl.c"
689 
690 #undef MINBPC
691 #undef BYTE_TYPE
692 #undef BYTE_TO_ASCII
693 #undef CHAR_MATCHES
694 #undef IS_NAME_CHAR
695 #undef IS_NAME_CHAR_MINBPC
696 #undef IS_NMSTRT_CHAR
697 #undef IS_NMSTRT_CHAR_MINBPC
698 #undef IS_INVALID_CHAR
699 
700 #endif /* not XML_MIN_SIZE */
701 
702 #ifdef XML_NS
703 
704 static const struct normal_encoding little2_encoding_ns = {
705   { VTABLE, 2, 0,
706 #if BYTEORDER == 1234
707     1
708 #else
709     0
710 #endif
711   },
712   {
713 #include "asciitab.h"
714 #include "latin1tab.h"
715   },
716   STANDARD_VTABLE(little2_)
717 };
718 
719 #endif
720 
721 static const struct normal_encoding little2_encoding = {
722   { VTABLE, 2, 0,
723 #if BYTEORDER == 1234
724     1
725 #else
726     0
727 #endif
728   },
729   {
730 #define BT_COLON BT_NMSTRT
731 #include "asciitab.h"
732 #undef BT_COLON
733 #include "latin1tab.h"
734   },
735   STANDARD_VTABLE(little2_)
736 };
737 
738 #if BYTEORDER != 4321
739 
740 #ifdef XML_NS
741 
742 static const struct normal_encoding internal_little2_encoding_ns = {
743   { VTABLE, 2, 0, 1 },
744   {
745 #include "iasciitab.h"
746 #include "latin1tab.h"
747   },
748   STANDARD_VTABLE(little2_)
749 };
750 
751 #endif
752 
753 static const struct normal_encoding internal_little2_encoding = {
754   { VTABLE, 2, 0, 1 },
755   {
756 #define BT_COLON BT_NMSTRT
757 #include "iasciitab.h"
758 #undef BT_COLON
759 #include "latin1tab.h"
760   },
761   STANDARD_VTABLE(little2_)
762 };
763 
764 #endif
765 
766 
767 #define BIG2_BYTE_TYPE(enc, p) \
768  ((p)[0] == 0 \
769   ? ((struct normal_encoding *)(enc))->type[(unsigned char)(p)[1]] \
770   : unicode_byte_type((p)[0], (p)[1]))
771 #define BIG2_BYTE_TO_ASCII(enc, p) ((p)[0] == 0 ? (p)[1] : -1)
772 #define BIG2_CHAR_MATCHES(enc, p, c) ((p)[0] == 0 && (p)[1] == c)
773 #define BIG2_IS_NAME_CHAR_MINBPC(enc, p) \
774   UCS2_GET_NAMING(namePages, (unsigned char)p[0], (unsigned char)p[1])
775 #define BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
776   UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[0], (unsigned char)p[1])
777 
778 #ifdef XML_MIN_SIZE
779 
780 static int FASTCALL
781 big2_byteType(const ENCODING *enc, const char *p)
782 {
783   return BIG2_BYTE_TYPE(enc, p);
784 }
785 
786 static int FASTCALL
787 big2_byteToAscii(const ENCODING *enc, const char *p)
788 {
789   return BIG2_BYTE_TO_ASCII(enc, p);
790 }
791 
792 static int FASTCALL
793 big2_charMatches(const ENCODING *enc, const char *p, int c)
794 {
795   return BIG2_CHAR_MATCHES(enc, p, c);
796 }
797 
798 static int FASTCALL
799 big2_isNameMin(const ENCODING *enc, const char *p)
800 {
801   return BIG2_IS_NAME_CHAR_MINBPC(enc, p);
802 }
803 
804 static int FASTCALL
805 big2_isNmstrtMin(const ENCODING *enc, const char *p)
806 {
807   return BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p);
808 }
809 
810 #undef VTABLE
811 #define VTABLE VTABLE1, big2_toUtf8, big2_toUtf16
812 
813 #else /* not XML_MIN_SIZE */
814 
815 #undef PREFIX
816 #define PREFIX(ident) big2_ ## ident
817 #define MINBPC(enc) 2
818 /* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
819 #define BYTE_TYPE(enc, p) BIG2_BYTE_TYPE(enc, p)
820 #define BYTE_TO_ASCII(enc, p) BIG2_BYTE_TO_ASCII(enc, p)
821 #define CHAR_MATCHES(enc, p, c) BIG2_CHAR_MATCHES(enc, p, c)
822 #define IS_NAME_CHAR(enc, p, n) 0
823 #define IS_NAME_CHAR_MINBPC(enc, p) BIG2_IS_NAME_CHAR_MINBPC(enc, p)
824 #define IS_NMSTRT_CHAR(enc, p, n) (0)
825 #define IS_NMSTRT_CHAR_MINBPC(enc, p) BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p)
826 
827 #include "xmltok_impl.c"
828 
829 #undef MINBPC
830 #undef BYTE_TYPE
831 #undef BYTE_TO_ASCII
832 #undef CHAR_MATCHES
833 #undef IS_NAME_CHAR
834 #undef IS_NAME_CHAR_MINBPC
835 #undef IS_NMSTRT_CHAR
836 #undef IS_NMSTRT_CHAR_MINBPC
837 #undef IS_INVALID_CHAR
838 
839 #endif /* not XML_MIN_SIZE */
840 
841 #ifdef XML_NS
842 
843 static const struct normal_encoding big2_encoding_ns = {
844   { VTABLE, 2, 0,
845 #if BYTEORDER == 4321
846   1
847 #else
848   0
849 #endif
850   },
851   {
852 #include "asciitab.h"
853 #include "latin1tab.h"
854   },
855   STANDARD_VTABLE(big2_)
856 };
857 
858 #endif
859 
860 static const struct normal_encoding big2_encoding = {
861   { VTABLE, 2, 0,
862 #if BYTEORDER == 4321
863   1
864 #else
865   0
866 #endif
867   },
868   {
869 #define BT_COLON BT_NMSTRT
870 #include "asciitab.h"
871 #undef BT_COLON
872 #include "latin1tab.h"
873   },
874   STANDARD_VTABLE(big2_)
875 };
876 
877 #if BYTEORDER != 1234
878 
879 #ifdef XML_NS
880 
881 static const struct normal_encoding internal_big2_encoding_ns = {
882   { VTABLE, 2, 0, 1 },
883   {
884 #include "iasciitab.h"
885 #include "latin1tab.h"
886   },
887   STANDARD_VTABLE(big2_)
888 };
889 
890 #endif
891 
892 static const struct normal_encoding internal_big2_encoding = {
893   { VTABLE, 2, 0, 1 },
894   {
895 #define BT_COLON BT_NMSTRT
896 #include "iasciitab.h"
897 #undef BT_COLON
898 #include "latin1tab.h"
899   },
900   STANDARD_VTABLE(big2_)
901 };
902 
903 #endif
904 
905 #undef PREFIX
906 
907 static int FASTCALL
908 streqci(const char *s1, const char *s2)
909 {
910   for (;;) {
911     char c1 = *s1++;
912     char c2 = *s2++;
913     if (ASCII_a <= c1 && c1 <= ASCII_z)
914       c1 += ASCII_A - ASCII_a;
915     if (ASCII_a <= c2 && c2 <= ASCII_z)
916       c2 += ASCII_A - ASCII_a;
917     if (c1 != c2)
918       return 0;
919     if (!c1)
920       break;
921   }
922   return 1;
923 }
924 
925 static void FASTCALL
926 initUpdatePosition(const ENCODING *enc, const char *ptr,
927                    const char *end, POSITION *pos)
928 {
929   normal_updatePosition(&utf8_encoding.enc, ptr, end, pos);
930 }
931 
932 static int FASTCALL
933 toAscii(const ENCODING *enc, const char *ptr, const char *end)
934 {
935   char buf[1];
936   char *p = buf;
937   XmlUtf8Convert(enc, &ptr, end, &p, p + 1);
938   if (p == buf)
939     return -1;
940   else
941     return buf[0];
942 }
943 
944 static int FASTCALL
945 isSpace(int c)
946 {
947   switch (c) {
948   case 0x20:
949   case 0xD:
950   case 0xA:
951   case 0x9:
952     return 1;
953   }
954   return 0;
955 }
956 
957 /* Return 1 if there's just optional white space or there's an S
958    followed by name=val.
959 */
960 static int FASTCALL
961 parsePseudoAttribute(const ENCODING *enc,
962                      const char *ptr,
963                      const char *end,
964                      const char **namePtr,
965                      const char **nameEndPtr,
966                      const char **valPtr,
967                      const char **nextTokPtr)
968 {
969   int c;
970   char open;
971   if (ptr == end) {
972     *namePtr = NULL;
973     return 1;
974   }
975   if (!isSpace(toAscii(enc, ptr, end))) {
976     *nextTokPtr = ptr;
977     return 0;
978   }
979   do {
980     ptr += enc->minBytesPerChar;
981   } while (isSpace(toAscii(enc, ptr, end)));
982   if (ptr == end) {
983     *namePtr = NULL;
984     return 1;
985   }
986   *namePtr = ptr;
987   for (;;) {
988     c = toAscii(enc, ptr, end);
989     if (c == -1) {
990       *nextTokPtr = ptr;
991       return 0;
992     }
993     if (c == ASCII_EQUALS) {
994       *nameEndPtr = ptr;
995       break;
996     }
997     if (isSpace(c)) {
998       *nameEndPtr = ptr;
999       do {
1000         ptr += enc->minBytesPerChar;
1001       } while (isSpace(c = toAscii(enc, ptr, end)));
1002       if (c != ASCII_EQUALS) {
1003         *nextTokPtr = ptr;
1004         return 0;
1005       }
1006       break;
1007     }
1008     ptr += enc->minBytesPerChar;
1009   }
1010   if (ptr == *namePtr) {
1011     *nextTokPtr = ptr;
1012     return 0;
1013   }
1014   ptr += enc->minBytesPerChar;
1015   c = toAscii(enc, ptr, end);
1016   while (isSpace(c)) {
1017     ptr += enc->minBytesPerChar;
1018     c = toAscii(enc, ptr, end);
1019   }
1020   if (c != ASCII_QUOT && c != ASCII_APOS) {
1021     *nextTokPtr = ptr;
1022     return 0;
1023   }
1024   open = (char)c;
1025   ptr += enc->minBytesPerChar;
1026   *valPtr = ptr;
1027   for (;; ptr += enc->minBytesPerChar) {
1028     c = toAscii(enc, ptr, end);
1029     if (c == open)
1030       break;
1031     if (!(ASCII_a <= c && c <= ASCII_z)
1032         && !(ASCII_A <= c && c <= ASCII_Z)
1033         && !(ASCII_0 <= c && c <= ASCII_9)
1034         && c != ASCII_PERIOD
1035         && c != ASCII_MINUS
1036         && c != ASCII_UNDERSCORE) {
1037       *nextTokPtr = ptr;
1038       return 0;
1039     }
1040   }
1041   *nextTokPtr = ptr + enc->minBytesPerChar;
1042   return 1;
1043 }
1044 
1045 static const char KW_version[] = {
1046   ASCII_v, ASCII_e, ASCII_r, ASCII_s, ASCII_i, ASCII_o, ASCII_n, '\0'
1047 };
1048 
1049 static const char KW_encoding[] = {
1050   ASCII_e, ASCII_n, ASCII_c, ASCII_o, ASCII_d, ASCII_i, ASCII_n, ASCII_g, '\0'
1051 };
1052 
1053 static const char KW_standalone[] = {
1054   ASCII_s, ASCII_t, ASCII_a, ASCII_n, ASCII_d, ASCII_a, ASCII_l, ASCII_o,
1055   ASCII_n, ASCII_e, '\0'
1056 };
1057 
1058 static const char KW_yes[] = {
1059   ASCII_y, ASCII_e, ASCII_s,  '\0'
1060 };
1061 
1062 static const char KW_no[] = {
1063   ASCII_n, ASCII_o,  '\0'
1064 };
1065 
1066 static int
1067 doParseXmlDecl(const ENCODING *(*encodingFinder)(const ENCODING *,
1068                                                  const char *,
1069                                                  const char *),
1070                int isGeneralTextEntity,
1071                const ENCODING *enc,
1072                const char *ptr,
1073                const char *end,
1074                const char **badPtr,
1075                const char **versionPtr,
1076                const char **versionEndPtr,
1077                const char **encodingName,
1078                const ENCODING **encoding,
1079                int *standalone)
1080 {
1081   const char *val = NULL;
1082   const char *name = NULL;
1083   const char *nameEnd = NULL;
1084   ptr += 5 * enc->minBytesPerChar;
1085   end -= 2 * enc->minBytesPerChar;
1086   if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)
1087       || !name) {
1088     *badPtr = ptr;
1089     return 0;
1090   }
1091   if (!XmlNameMatchesAscii(enc, name, nameEnd, KW_version)) {
1092     if (!isGeneralTextEntity) {
1093       *badPtr = name;
1094       return 0;
1095     }
1096   }
1097   else {
1098     if (versionPtr)
1099       *versionPtr = val;
1100     if (versionEndPtr)
1101       *versionEndPtr = ptr;
1102     if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)) {
1103       *badPtr = ptr;
1104       return 0;
1105     }
1106     if (!name) {
1107       if (isGeneralTextEntity) {
1108         /* a TextDecl must have an EncodingDecl */
1109         *badPtr = ptr;
1110         return 0;
1111       }
1112       return 1;
1113     }
1114   }
1115   if (XmlNameMatchesAscii(enc, name, nameEnd, KW_encoding)) {
1116     int c = toAscii(enc, val, end);
1117     if (!(ASCII_a <= c && c <= ASCII_z) && !(ASCII_A <= c && c <= ASCII_Z)) {
1118       *badPtr = val;
1119       return 0;
1120     }
1121     if (encodingName)
1122       *encodingName = val;
1123     if (encoding)
1124       *encoding = encodingFinder(enc, val, ptr - enc->minBytesPerChar);
1125     if (!parsePseudoAttribute(enc, ptr, end, &name, &nameEnd, &val, &ptr)) {
1126       *badPtr = ptr;
1127       return 0;
1128     }
1129     if (!name)
1130       return 1;
1131   }
1132   if (!XmlNameMatchesAscii(enc, name, nameEnd, KW_standalone)
1133       || isGeneralTextEntity) {
1134     *badPtr = name;
1135     return 0;
1136   }
1137   if (XmlNameMatchesAscii(enc, val, ptr - enc->minBytesPerChar, KW_yes)) {
1138     if (standalone)
1139       *standalone = 1;
1140   }
1141   else if (XmlNameMatchesAscii(enc, val, ptr - enc->minBytesPerChar, KW_no)) {
1142     if (standalone)
1143       *standalone = 0;
1144   }
1145   else {
1146     *badPtr = val;
1147     return 0;
1148   }
1149   while (isSpace(toAscii(enc, ptr, end)))
1150     ptr += enc->minBytesPerChar;
1151   if (ptr != end) {
1152     *badPtr = ptr;
1153     return 0;
1154   }
1155   return 1;
1156 }
1157 
1158 static int FASTCALL
1159 checkCharRefNumber(int result)
1160 {
1161   switch (result >> 8) {
1162   case 0xD8: case 0xD9: case 0xDA: case 0xDB:
1163   case 0xDC: case 0xDD: case 0xDE: case 0xDF:
1164     return -1;
1165   case 0:
1166     if (latin1_encoding.type[result] == BT_NONXML)
1167       return -1;
1168     break;
1169   case 0xFF:
1170     if (result == 0xFFFE || result == 0xFFFF)
1171       return -1;
1172     break;
1173   }
1174   return result;
1175 }
1176 
1177 int
1178 XmlUtf8Encode(int c, char *buf)
1179 {
1180   enum {
1181     /* minN is minimum legal resulting value for N byte sequence */
1182     min2 = 0x80,
1183     min3 = 0x800,
1184     min4 = 0x10000
1185   };
1186 
1187   if (c < 0)
1188     return 0;
1189   if (c < min2) {
1190     buf[0] = (char)(c | UTF8_cval1);
1191     return 1;
1192   }
1193   if (c < min3) {
1194     buf[0] = (char)((c >> 6) | UTF8_cval2);
1195     buf[1] = (char)((c & 0x3f) | 0x80);
1196     return 2;
1197   }
1198   if (c < min4) {
1199     buf[0] = (char)((c >> 12) | UTF8_cval3);
1200     buf[1] = (char)(((c >> 6) & 0x3f) | 0x80);
1201     buf[2] = (char)((c & 0x3f) | 0x80);
1202     return 3;
1203   }
1204   if (c < 0x110000) {
1205     buf[0] = (char)((c >> 18) | UTF8_cval4);
1206     buf[1] = (char)(((c >> 12) & 0x3f) | 0x80);
1207     buf[2] = (char)(((c >> 6) & 0x3f) | 0x80);
1208     buf[3] = (char)((c & 0x3f) | 0x80);
1209     return 4;
1210   }
1211   return 0;
1212 }
1213 
1214 int
1215 XmlUtf16Encode(int charNum, unsigned short *buf)
1216 {
1217   if (charNum < 0)
1218     return 0;
1219   if (charNum < 0x10000) {
1220     buf[0] = (unsigned short)charNum;
1221     return 1;
1222   }
1223   if (charNum < 0x110000) {
1224     charNum -= 0x10000;
1225     buf[0] = (unsigned short)((charNum >> 10) + 0xD800);
1226     buf[1] = (unsigned short)((charNum & 0x3FF) + 0xDC00);
1227     return 2;
1228   }
1229   return 0;
1230 }
1231 
1232 struct unknown_encoding {
1233   struct normal_encoding normal;
1234   int (*convert)(void *userData, const char *p);
1235   void *userData;
1236   unsigned short utf16[256];
1237   char utf8[256][4];
1238 };
1239 
1240 #define AS_UNKNOWN_ENCODING(enc)  ((const struct unknown_encoding *) (enc))
1241 
1242 int
1243 XmlSizeOfUnknownEncoding(void)
1244 {
1245   return sizeof(struct unknown_encoding);
1246 }
1247 
1248 static int FASTCALL
1249 unknown_isName(const ENCODING *enc, const char *p)
1250 {
1251   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1252   int c = uenc->convert(uenc->userData, p);
1253   if (c & ~0xFFFF)
1254     return 0;
1255   return UCS2_GET_NAMING(namePages, c >> 8, c & 0xFF);
1256 }
1257 
1258 static int FASTCALL
1259 unknown_isNmstrt(const ENCODING *enc, const char *p)
1260 {
1261   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1262   int c = uenc->convert(uenc->userData, p);
1263   if (c & ~0xFFFF)
1264     return 0;
1265   return UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xFF);
1266 }
1267 
1268 static int FASTCALL
1269 unknown_isInvalid(const ENCODING *enc, const char *p)
1270 {
1271   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1272   int c = uenc->convert(uenc->userData, p);
1273   return (c & ~0xFFFF) || checkCharRefNumber(c) < 0;
1274 }
1275 
1276 static void FASTCALL
1277 unknown_toUtf8(const ENCODING *enc,
1278                const char **fromP, const char *fromLim,
1279                char **toP, const char *toLim)
1280 {
1281   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1282   char buf[XML_UTF8_ENCODE_MAX];
1283   for (;;) {
1284     const char *utf8;
1285     int n;
1286     if (*fromP == fromLim)
1287       break;
1288     utf8 = uenc->utf8[(unsigned char)**fromP];
1289     n = *utf8++;
1290     if (n == 0) {
1291       int c = uenc->convert(uenc->userData, *fromP);
1292       n = XmlUtf8Encode(c, buf);
1293       if (n > toLim - *toP)
1294         break;
1295       utf8 = buf;
1296       *fromP += (AS_NORMAL_ENCODING(enc)->type[(unsigned char)**fromP]
1297                  - (BT_LEAD2 - 2));
1298     }
1299     else {
1300       if (n > toLim - *toP)
1301         break;
1302       (*fromP)++;
1303     }
1304     do {
1305       *(*toP)++ = *utf8++;
1306     } while (--n != 0);
1307   }
1308 }
1309 
1310 static void FASTCALL
1311 unknown_toUtf16(const ENCODING *enc,
1312                 const char **fromP, const char *fromLim,
1313                 unsigned short **toP, const unsigned short *toLim)
1314 {
1315   const struct unknown_encoding *uenc = AS_UNKNOWN_ENCODING(enc);
1316   while (*fromP != fromLim && *toP != toLim) {
1317     unsigned short c = uenc->utf16[(unsigned char)**fromP];
1318     if (c == 0) {
1319       c = (unsigned short)
1320           uenc->convert(uenc->userData, *fromP);
1321       *fromP += (AS_NORMAL_ENCODING(enc)->type[(unsigned char)**fromP]
1322                  - (BT_LEAD2 - 2));
1323     }
1324     else
1325       (*fromP)++;
1326     *(*toP)++ = c;
1327   }
1328 }
1329 
1330 ENCODING *
1331 XmlInitUnknownEncoding(void *mem,
1332                        int *table,
1333                        int (*convert)(void *userData, const char *p),
1334                        void *userData)
1335 {
1336   int i;
1337   struct unknown_encoding *e = mem;
1338   for (i = 0; i < (int)sizeof(struct normal_encoding); i++)
1339     ((char *)mem)[i] = ((char *)&latin1_encoding)[i];
1340   for (i = 0; i < 128; i++)
1341     if (latin1_encoding.type[i] != BT_OTHER
1342         && latin1_encoding.type[i] != BT_NONXML
1343         && table[i] != i)
1344       return 0;
1345   for (i = 0; i < 256; i++) {
1346     int c = table[i];
1347     if (c == -1) {
1348       e->normal.type[i] = BT_MALFORM;
1349       /* This shouldn't really get used. */
1350       e->utf16[i] = 0xFFFF;
1351       e->utf8[i][0] = 1;
1352       e->utf8[i][1] = 0;
1353     }
1354     else if (c < 0) {
1355       if (c < -4)
1356         return 0;
1357       e->normal.type[i] = (unsigned char)(BT_LEAD2 - (c + 2));
1358       e->utf8[i][0] = 0;
1359       e->utf16[i] = 0;
1360     }
1361     else if (c < 0x80) {
1362       if (latin1_encoding.type[c] != BT_OTHER
1363           && latin1_encoding.type[c] != BT_NONXML
1364           && c != i)
1365         return 0;
1366       e->normal.type[i] = latin1_encoding.type[c];
1367       e->utf8[i][0] = 1;
1368       e->utf8[i][1] = (char)c;
1369       e->utf16[i] = (unsigned short)(c == 0 ? 0xFFFF : c);
1370     }
1371     else if (checkCharRefNumber(c) < 0) {
1372       e->normal.type[i] = BT_NONXML;
1373       /* This shouldn't really get used. */
1374       e->utf16[i] = 0xFFFF;
1375       e->utf8[i][0] = 1;
1376       e->utf8[i][1] = 0;
1377     }
1378     else {
1379       if (c > 0xFFFF)
1380         return 0;
1381       if (UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xff))
1382         e->normal.type[i] = BT_NMSTRT;
1383       else if (UCS2_GET_NAMING(namePages, c >> 8, c & 0xff))
1384         e->normal.type[i] = BT_NAME;
1385       else
1386         e->normal.type[i] = BT_OTHER;
1387       e->utf8[i][0] = (char)XmlUtf8Encode(c, e->utf8[i] + 1);
1388       e->utf16[i] = (unsigned short)c;
1389     }
1390   }
1391   e->userData = userData;
1392   e->convert = convert;
1393   if (convert) {
1394     e->normal.isName2 = unknown_isName;
1395     e->normal.isName3 = unknown_isName;
1396     e->normal.isName4 = unknown_isName;
1397     e->normal.isNmstrt2 = unknown_isNmstrt;
1398     e->normal.isNmstrt3 = unknown_isNmstrt;
1399     e->normal.isNmstrt4 = unknown_isNmstrt;
1400     e->normal.isInvalid2 = unknown_isInvalid;
1401     e->normal.isInvalid3 = unknown_isInvalid;
1402     e->normal.isInvalid4 = unknown_isInvalid;
1403   }
1404   e->normal.enc.utf8Convert = unknown_toUtf8;
1405   e->normal.enc.utf16Convert = unknown_toUtf16;
1406   return &(e->normal.enc);
1407 }
1408 
1409 /* If this enumeration is changed, getEncodingIndex and encodings
1410 must also be changed. */
1411 enum {
1412   UNKNOWN_ENC = -1,
1413   ISO_8859_1_ENC = 0,
1414   US_ASCII_ENC,
1415   UTF_8_ENC,
1416   UTF_16_ENC,
1417   UTF_16BE_ENC,
1418   UTF_16LE_ENC,
1419   /* must match encodingNames up to here */
1420   NO_ENC
1421 };
1422 
1423 static const char KW_ISO_8859_1[] = {
1424   ASCII_I, ASCII_S, ASCII_O, ASCII_MINUS, ASCII_8, ASCII_8, ASCII_5, ASCII_9,
1425   ASCII_MINUS, ASCII_1, '\0'
1426 };
1427 static const char KW_US_ASCII[] = {
1428   ASCII_U, ASCII_S, ASCII_MINUS, ASCII_A, ASCII_S, ASCII_C, ASCII_I, ASCII_I,
1429   '\0'
1430 };
1431 static const char KW_UTF_8[] =  {
1432   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_8, '\0'
1433 };
1434 static const char KW_UTF_16[] = {
1435   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, '\0'
1436 };
1437 static const char KW_UTF_16BE[] = {
1438   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, ASCII_B, ASCII_E,
1439   '\0'
1440 };
1441 static const char KW_UTF_16LE[] = {
1442   ASCII_U, ASCII_T, ASCII_F, ASCII_MINUS, ASCII_1, ASCII_6, ASCII_L, ASCII_E,
1443   '\0'
1444 };
1445 
1446 static int FASTCALL
1447 getEncodingIndex(const char *name)
1448 {
1449   static const char *encodingNames[] = {
1450     KW_ISO_8859_1,
1451     KW_US_ASCII,
1452     KW_UTF_8,
1453     KW_UTF_16,
1454     KW_UTF_16BE,
1455     KW_UTF_16LE,
1456   };
1457   int i;
1458   if (name == NULL)
1459     return NO_ENC;
1460   for (i = 0; i < (int)(sizeof(encodingNames)/sizeof(encodingNames[0])); i++)
1461     if (streqci(name, encodingNames[i]))
1462       return i;
1463   return UNKNOWN_ENC;
1464 }
1465 
1466 /* For binary compatibility, we store the index of the encoding
1467    specified at initialization in the isUtf16 member.
1468 */
1469 
1470 #define INIT_ENC_INDEX(enc) ((int)(enc)->initEnc.isUtf16)
1471 #define SET_INIT_ENC_INDEX(enc, i) ((enc)->initEnc.isUtf16 = (char)i)
1472 
1473 /* This is what detects the encoding.  encodingTable maps from
1474    encoding indices to encodings; INIT_ENC_INDEX(enc) is the index of
1475    the external (protocol) specified encoding; state is
1476    XML_CONTENT_STATE if we're parsing an external text entity, and
1477    XML_PROLOG_STATE otherwise.
1478 */
1479 
1480 
1481 static int FASTCALL
1482 initScan(const ENCODING **encodingTable,
1483          const INIT_ENCODING *enc,
1484          int state,
1485          const char *ptr,
1486          const char *end,
1487          const char **nextTokPtr)
1488 {
1489   const ENCODING **encPtr;
1490 
1491   if (ptr == end)
1492     return XML_TOK_NONE;
1493   encPtr = enc->encPtr;
1494   if (ptr + 1 == end) {
1495     /* only a single byte available for auto-detection */
1496 #ifndef XML_DTD /* FIXME */
1497     /* a well-formed document entity must have more than one byte */
1498     if (state != XML_CONTENT_STATE)
1499       return XML_TOK_PARTIAL;
1500 #endif
1501     /* so we're parsing an external text entity... */
1502     /* if UTF-16 was externally specified, then we need at least 2 bytes */
1503     switch (INIT_ENC_INDEX(enc)) {
1504     case UTF_16_ENC:
1505     case UTF_16LE_ENC:
1506     case UTF_16BE_ENC:
1507       return XML_TOK_PARTIAL;
1508     }
1509     switch ((unsigned char)*ptr) {
1510     case 0xFE:
1511     case 0xFF:
1512     case 0xEF: /* possibly first byte of UTF-8 BOM */
1513       if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
1514           && state == XML_CONTENT_STATE)
1515         break;
1516       /* fall through */
1517     case 0x00:
1518     case 0x3C:
1519       return XML_TOK_PARTIAL;
1520     }
1521   }
1522   else {
1523     switch (((unsigned char)ptr[0] << 8) | (unsigned char)ptr[1]) {
1524     case 0xFEFF:
1525       if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
1526           && state == XML_CONTENT_STATE)
1527         break;
1528       *nextTokPtr = ptr + 2;
1529       *encPtr = encodingTable[UTF_16BE_ENC];
1530       return XML_TOK_BOM;
1531     /* 00 3C is handled in the default case */
1532     case 0x3C00:
1533       if ((INIT_ENC_INDEX(enc) == UTF_16BE_ENC
1534            || INIT_ENC_INDEX(enc) == UTF_16_ENC)
1535           && state == XML_CONTENT_STATE)
1536         break;
1537       *encPtr = encodingTable[UTF_16LE_ENC];
1538       return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1539     case 0xFFFE:
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_16LE_ENC];
1545       return XML_TOK_BOM;
1546     case 0xEFBB:
1547       /* Maybe a UTF-8 BOM (EF BB BF) */
1548       /* If there's an explicitly specified (external) encoding
1549          of ISO-8859-1 or some flavour of UTF-16
1550          and this is an external text entity,
1551          don't look for the BOM,
1552          because it might be a legal data.
1553       */
1554       if (state == XML_CONTENT_STATE) {
1555         int e = INIT_ENC_INDEX(enc);
1556         if (e == ISO_8859_1_ENC || e == UTF_16BE_ENC
1557             || e == UTF_16LE_ENC || e == UTF_16_ENC)
1558           break;
1559       }
1560       if (ptr + 2 == end)
1561         return XML_TOK_PARTIAL;
1562       if ((unsigned char)ptr[2] == 0xBF) {
1563         *nextTokPtr = ptr + 3;
1564         *encPtr = encodingTable[UTF_8_ENC];
1565         return XML_TOK_BOM;
1566       }
1567       break;
1568     default:
1569       if (ptr[0] == '\0') {
1570         /* 0 isn't a legal data character. Furthermore a document
1571            entity can only start with ASCII characters.  So the only
1572            way this can fail to be big-endian UTF-16 if it it's an
1573            external parsed general entity that's labelled as
1574            UTF-16LE.
1575         */
1576         if (state == XML_CONTENT_STATE && INIT_ENC_INDEX(enc) == UTF_16LE_ENC)
1577           break;
1578         *encPtr = encodingTable[UTF_16BE_ENC];
1579         return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1580       }
1581       else if (ptr[1] == '\0') {
1582         /* We could recover here in the case:
1583             - parsing an external entity
1584             - second byte is 0
1585             - no externally specified encoding
1586             - no encoding declaration
1587            by assuming UTF-16LE.  But we don't, because this would mean when
1588            presented just with a single byte, we couldn't reliably determine
1589            whether we needed further bytes.
1590         */
1591         if (state == XML_CONTENT_STATE)
1592           break;
1593         *encPtr = encodingTable[UTF_16LE_ENC];
1594         return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1595       }
1596       break;
1597     }
1598   }
1599   *encPtr = encodingTable[INIT_ENC_INDEX(enc)];
1600   return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
1601 }
1602 
1603 
1604 #define NS(x) x
1605 #define ns(x) x
1606 #include "xmltok_ns.c"
1607 #undef NS
1608 #undef ns
1609 
1610 #ifdef XML_NS
1611 
1612 #define NS(x) x ## NS
1613 #define ns(x) x ## _ns
1614 
1615 #include "xmltok_ns.c"
1616 
1617 #undef NS
1618 #undef ns
1619 
1620 ENCODING *
1621 XmlInitUnknownEncodingNS(void *mem,
1622                          int *table,
1623                          int (*convert)(void *userData, const char *p),
1624                          void *userData)
1625 {
1626   ENCODING *enc = XmlInitUnknownEncoding(mem, table, convert, userData);
1627   if (enc)
1628     ((struct normal_encoding *)enc)->type[ASCII_COLON] = BT_COLON;
1629   return enc;
1630 }
1631 
1632 #endif /* XML_NS */
1633