external/mit/expat/dist/lib/xmltok.c

   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
 125 isNever(const ENCODING *enc, const char *p)
 126 {
 127   return 0;
 128 }
 129
 130 static int PTRFASTCALL
 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
 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
 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
 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
 159 utf8_isInvalid2(const ENCODING *enc, const char *p)
 160 {
 161   return UTF8_INVALID2((const unsigned char *)p);
 162 }
 163
 164 static int PTRFASTCALL
 165 utf8_isInvalid3(const ENCODING *enc, const char *p)
 166 {
 167   return UTF8_INVALID3((const unsigned char *)p);
 168 }
 169
 170 static int PTRFASTCALL
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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_)
 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
 659 little2_byteToAscii(const ENCODING *enc, const char *p)
 660 {
 661   return LITTLE2_BYTE_TO_ASCII(enc, p);
 662 }
 663
 664 static int PTRCALL
 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
 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
 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
 794 big2_byteType(const ENCODING *enc, const char *p)
 795 {
 796   return BIG2_BYTE_TYPE(enc, p);
 797 }
 798
 799 static int PTRFASTCALL
 800 big2_byteToAscii(const ENCODING *enc, const char *p)
 801 {
 802   return BIG2_BYTE_TO_ASCII(enc, p);
 803 }
 804
 805 static int PTRCALL
 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
 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
 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
 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
 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
 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
 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
 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
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
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
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
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
1258 XmlSizeOfUnknownEncoding(void)
1259 {
1260   return sizeof(struct unknown_encoding);
1261 }
1262
1263 static int PTRFASTCALL
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
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
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
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
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 *
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
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
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 *
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 */