/* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd

   See the file COPYING for copying permission.

*/

#ifdef COMPILED_FROM_DSP

#include "winconfig.h"

#elif defined(MACOS_CLASSIC)

#include "macconfig.h"

#elif defined(__amigaos4__)

#include "amigaconfig.h"

#else

#ifdef HAVE_EXPAT_CONFIG_H

#include <expat_config.h>

#endif

#endif /* ndef COMPILED_FROM_DSP */

#include <stddef.h>

#include "expat_external.h"

#include "internal.h"

#include "xmltok.h"

#include "nametab.h"

#ifdef XML_DTD

#define IGNORE_SECTION_TOK_VTABLE , PREFIX(ignoreSectionTok)

#else

#define IGNORE_SECTION_TOK_VTABLE /* as nothing */

#endif

#define VTABLE1 \

  { PREFIX(prologTok), PREFIX(contentTok), \

    PREFIX(cdataSectionTok) IGNORE_SECTION_TOK_VTABLE }, \

  { PREFIX(attributeValueTok), PREFIX(entityValueTok) }, \

  PREFIX(sameName), \

  PREFIX(nameMatchesAscii), \

  PREFIX(nameLength), \

  PREFIX(skipS), \

  PREFIX(getAtts), \

  PREFIX(charRefNumber), \

  PREFIX(predefinedEntityName), \

  PREFIX(updatePosition), \

  PREFIX(isPublicId)

#define VTABLE VTABLE1, PREFIX(toUtf8), PREFIX(toUtf16)

#define UCS2_GET_NAMING(pages, hi, lo) \

   (namingBitmap[(pages[hi] << 3) + ((lo) >> 5)] & (1 << ((lo) & 0x1F)))

/* A 2 byte UTF-8 representation splits the characters 11 bits between

   the bottom 5 and 6 bits of the bytes.  We need 8 bits to index into

   pages, 3 bits to add to that index and 5 bits to generate the mask.

*/

#define UTF8_GET_NAMING2(pages, byte) \

    (namingBitmap[((pages)[(((byte)[0]) >> 2) & 7] << 3) \

                      + ((((byte)[0]) & 3) << 1) \

                      + ((((byte)[1]) >> 5) & 1)] \

         & (1 << (((byte)[1]) & 0x1F)))

/* A 3 byte UTF-8 representation splits the characters 16 bits between

   the bottom 4, 6 and 6 bits of the bytes.  We need 8 bits to index

   into pages, 3 bits to add to that index and 5 bits to generate the

   mask.

*/

#define UTF8_GET_NAMING3(pages, byte) \

  (namingBitmap[((pages)[((((byte)[0]) & 0xF) << 4) \

                             + ((((byte)[1]) >> 2) & 0xF)] \

                       << 3) \

                      + ((((byte)[1]) & 3) << 1) \

                      + ((((byte)[2]) >> 5) & 1)] \

         & (1 << (((byte)[2]) & 0x1F)))

#define UTF8_GET_NAMING(pages, p, n) \

  ((n) == 2 \

  ? UTF8_GET_NAMING2(pages, (const unsigned char *)(p)) \

  : ((n) == 3 \

     ? UTF8_GET_NAMING3(pages, (const unsigned char *)(p)) \

     : 0))

/* Detection of invalid UTF-8 sequences is based on Table 3.1B

   of Unicode 3.2: http://www.unicode.org/unicode/reports/tr28/

   with the additional restriction of not allowing the Unicode

   code points 0xFFFF and 0xFFFE (sequences EF,BF,BF and EF,BF,BE).

   Implementation details:

     (A & 0x80) == 0     means A < 0x80

   and

     (A & 0xC0) == 0xC0  means A > 0xBF

*/

#define UTF8_INVALID2(p) \

  ((*p) < 0xC2 || ((p)[1] & 0x80) == 0 || ((p)[1] & 0xC0) == 0xC0)

#define UTF8_INVALID3(p) \

  (((p)[2] & 0x80) == 0 \

  || \

  ((*p) == 0xEF && (p)[1] == 0xBF \

    ? \

    (p)[2] > 0xBD \

    : \

    ((p)[2] & 0xC0) == 0xC0) \

  || \

  ((*p) == 0xE0 \

    ? \

    (p)[1] < 0xA0 || ((p)[1] & 0xC0) == 0xC0 \

    : \

    ((p)[1] & 0x80) == 0 \

    || \

    ((*p) == 0xED ? (p)[1] > 0x9F : ((p)[1] & 0xC0) == 0xC0)))

#define UTF8_INVALID4(p) \

  (((p)[3] & 0x80) == 0 || ((p)[3] & 0xC0) == 0xC0 \

  || \

  ((p)[2] & 0x80) == 0 || ((p)[2] & 0xC0) == 0xC0 \

  || \

  ((*p) == 0xF0 \

    ? \

    (p)[1] < 0x90 || ((p)[1] & 0xC0) == 0xC0 \

    : \

    ((p)[1] & 0x80) == 0 \

    || \

    ((*p) == 0xF4 ? (p)[1] > 0x8F : ((p)[1] & 0xC0) == 0xC0)))

static int PTRFASTCALL

isNever(const ENCODING *enc, const char *p)

{

  return 0;

}

static int PTRFASTCALL

utf8_isName2(const ENCODING *enc, const char *p)

{

  return UTF8_GET_NAMING2(namePages, (const unsigned char *)p);

}

static int PTRFASTCALL

utf8_isName3(const ENCODING *enc, const char *p)

{

  return UTF8_GET_NAMING3(namePages, (const unsigned char *)p);

}

#define utf8_isName4 isNever

static int PTRFASTCALL

utf8_isNmstrt2(const ENCODING *enc, const char *p)

{

  return UTF8_GET_NAMING2(nmstrtPages, (const unsigned char *)p);

}

static int PTRFASTCALL

utf8_isNmstrt3(const ENCODING *enc, const char *p)

{

  return UTF8_GET_NAMING3(nmstrtPages, (const unsigned char *)p);

}

#define utf8_isNmstrt4 isNever

static int PTRFASTCALL

utf8_isInvalid2(const ENCODING *enc, const char *p)

{

  return UTF8_INVALID2((const unsigned char *)p);

}

static int PTRFASTCALL

utf8_isInvalid3(const ENCODING *enc, const char *p)

{

  return UTF8_INVALID3((const unsigned char *)p);

}

static int PTRFASTCALL

utf8_isInvalid4(const ENCODING *enc, const char *p)

{

  return UTF8_INVALID4((const unsigned char *)p);

}

struct normal_encoding {

  ENCODING enc;

  unsigned char type[256];

#ifdef XML_MIN_SIZE

  int (PTRFASTCALL *byteType)(const ENCODING *, const char *);

  int (PTRFASTCALL *isNameMin)(const ENCODING *, const char *);

  int (PTRFASTCALL *isNmstrtMin)(const ENCODING *, const char *);

  int (PTRFASTCALL *byteToAscii)(const ENCODING *, const char *);

  int (PTRCALL *charMatches)(const ENCODING *, const char *, int);

#endif /* XML_MIN_SIZE */

  int (PTRFASTCALL *isName2)(const ENCODING *, const char *);

  int (PTRFASTCALL *isName3)(const ENCODING *, const char *);

  int (PTRFASTCALL *isName4)(const ENCODING *, const char *);

  int (PTRFASTCALL *isNmstrt2)(const ENCODING *, const char *);

  int (PTRFASTCALL *isNmstrt3)(const ENCODING *, const char *);

  int (PTRFASTCALL *isNmstrt4)(const ENCODING *, const char *);

  int (PTRFASTCALL *isInvalid2)(const ENCODING *, const char *);

  int (PTRFASTCALL *isInvalid3)(const ENCODING *, const char *);

  int (PTRFASTCALL *isInvalid4)(const ENCODING *, const char *);

};

#define AS_NORMAL_ENCODING(enc)   ((const struct normal_encoding *) (enc))

#ifdef XML_MIN_SIZE

#define STANDARD_VTABLE(E) \

 E ## byteType, \

 E ## isNameMin, \

 E ## isNmstrtMin, \

 E ## byteToAscii, \

 E ## charMatches,

#else

#define STANDARD_VTABLE(E) /* as nothing */

#endif

#define NORMAL_VTABLE(E) \

 E ## isName2, \

 E ## isName3, \

 E ## isName4, \

 E ## isNmstrt2, \

 E ## isNmstrt3, \

 E ## isNmstrt4, \

 E ## isInvalid2, \

 E ## isInvalid3, \

 E ## isInvalid4

static int FASTCALL checkCharRefNumber(int);

#include "xmltok_impl.h"

#include "ascii.h"

#ifdef XML_MIN_SIZE

#define sb_isNameMin isNever

#define sb_isNmstrtMin isNever

#endif

#ifdef XML_MIN_SIZE

#define MINBPC(enc) ((enc)->minBytesPerChar)

#else

/* minimum bytes per character */

#define MINBPC(enc) 1

#endif

#define SB_BYTE_TYPE(enc, p) \

  (((struct normal_encoding *)(enc))->type[(unsigned char)*(p)])

#ifdef XML_MIN_SIZE

static int PTRFASTCALL

sb_byteType(const ENCODING *enc, const char *p)

{

  return SB_BYTE_TYPE(enc, p);

}

#define BYTE_TYPE(enc, p) \

 (AS_NORMAL_ENCODING(enc)->byteType(enc, p))

#else

#define BYTE_TYPE(enc, p) SB_BYTE_TYPE(enc, p)

#endif

#ifdef XML_MIN_SIZE

#define BYTE_TO_ASCII(enc, p) \

 (AS_NORMAL_ENCODING(enc)->byteToAscii(enc, p))

static int PTRFASTCALL

sb_byteToAscii(const ENCODING *enc, const char *p)

{

  return *p;

}

#else

#define BYTE_TO_ASCII(enc, p) (*(p))

#endif

#define IS_NAME_CHAR(enc, p, n) \

 (AS_NORMAL_ENCODING(enc)->isName ## n(enc, p))

#define IS_NMSTRT_CHAR(enc, p, n) \

 (AS_NORMAL_ENCODING(enc)->isNmstrt ## n(enc, p))

#define IS_INVALID_CHAR(enc, p, n) \

 (AS_NORMAL_ENCODING(enc)->isInvalid ## n(enc, p))

#ifdef XML_MIN_SIZE

#define IS_NAME_CHAR_MINBPC(enc, p) \

 (AS_NORMAL_ENCODING(enc)->isNameMin(enc, p))

#define IS_NMSTRT_CHAR_MINBPC(enc, p) \

 (AS_NORMAL_ENCODING(enc)->isNmstrtMin(enc, p))

#else

#define IS_NAME_CHAR_MINBPC(enc, p) (0)

#define IS_NMSTRT_CHAR_MINBPC(enc, p) (0)

#endif

#ifdef XML_MIN_SIZE

#define CHAR_MATCHES(enc, p, c) \

 (AS_NORMAL_ENCODING(enc)->charMatches(enc, p, c))

static int PTRCALL

sb_charMatches(const ENCODING *enc, const char *p, int c)

{

  return *p == c;

}

#else

/* c is an ASCII character */

#define CHAR_MATCHES(enc, p, c) (*(p) == c)

#endif

#define PREFIX(ident) normal_ ## ident

#include "xmltok_impl.c"

#undef MINBPC

#undef BYTE_TYPE

#undef BYTE_TO_ASCII

#undef CHAR_MATCHES

#undef IS_NAME_CHAR

#undef IS_NAME_CHAR_MINBPC

#undef IS_NMSTRT_CHAR

#undef IS_NMSTRT_CHAR_MINBPC

#undef IS_INVALID_CHAR

enum {  /* UTF8_cvalN is value of masked first byte of N byte sequence */

  UTF8_cval1 = 0x00,

  UTF8_cval2 = 0xc0,

  UTF8_cval3 = 0xe0,

  UTF8_cval4 = 0xf0

};

static void PTRCALL

utf8_toUtf8(const ENCODING *enc,

            const char **fromP, const char *fromLim,

            char **toP, const char *toLim)

{

  char *to;

  const char *from;

  if (fromLim - *fromP > toLim - *toP) {

    /* Avoid copying partial characters. */

    for (fromLim = *fromP + (toLim - *toP); fromLim > *fromP; fromLim--)

      if (((unsigned char)fromLim[-1] & 0xc0) != 0x80)

        break;

  }

  for (to = *toP, from = *fromP; from != fromLim; from++, to++)

    *to = *from;

  *fromP = from;

  *toP = to;

}

static void PTRCALL

utf8_toUtf16(const ENCODING *enc,

             const char **fromP, const char *fromLim,

             unsigned short **toP, const unsigned short *toLim)

{

  unsigned short *to = *toP;

  const char *from = *fromP;

  while (from != fromLim && to != toLim) {

    switch (((struct normal_encoding *)enc)->type[(unsigned char)*from]) {

    case BT_LEAD2:

      *to++ = (unsigned short)(((from[0] & 0x1f) << 6) | (from[1] & 0x3f));

      from += 2;

      break;

    case BT_LEAD3:

      *to++ = (unsigned short)(((from[0] & 0xf) << 12)

                               | ((from[1] & 0x3f) << 6) | (from[2] & 0x3f));

      from += 3;

      break;

    case BT_LEAD4:

      {

        unsigned long n;

        if (to + 1 == toLim)

          goto after;

        n = ((from[0] & 0x7) << 18) | ((from[1] & 0x3f) << 12)

            | ((from[2] & 0x3f) << 6) | (from[3] & 0x3f);

        n -= 0x10000;

        to[0] = (unsigned short)((n >> 10) | 0xD800);

        to[1] = (unsigned short)((n & 0x3FF) | 0xDC00);

        to += 2;

        from += 4;

      }

      break;

    default:

      *to++ = *from++;

      break;

    }

  }

after:

  *fromP = from;

  *toP = to;

}

#ifdef XML_NS

static const struct normal_encoding utf8_encoding_ns = {

  { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },

  {

#include "asciitab.h"

#include "utf8tab.h"

  },

  STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)

};

#endif

static const struct normal_encoding utf8_encoding = {

  { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },

  {

#define BT_COLON BT_NMSTRT

#include "asciitab.h"

#undef BT_COLON

#include "utf8tab.h"

  },

  STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)

};

#ifdef XML_NS

static const struct normal_encoding internal_utf8_encoding_ns = {

  { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },

  {

#include "iasciitab.h"

#include "utf8tab.h"

  },

  STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)

};

#endif

static const struct normal_encoding internal_utf8_encoding = {

  { VTABLE1, utf8_toUtf8, utf8_toUtf16, 1, 1, 0 },

  {

#define BT_COLON BT_NMSTRT

#include "iasciitab.h"

#undef BT_COLON

#include "utf8tab.h"

  },

  STANDARD_VTABLE(sb_) NORMAL_VTABLE(utf8_)

};

static void PTRCALL

latin1_toUtf8(const ENCODING *enc,

              const char **fromP, const char *fromLim,

              char **toP, const char *toLim)

{

  for (;;) {

    unsigned char c;

    if (*fromP == fromLim)

      break;

    c = (unsigned char)**fromP;

    if (c & 0x80) {

      if (toLim - *toP < 2)

        break;

      *(*toP)++ = (char)((c >> 6) | UTF8_cval2);

      *(*toP)++ = (char)((c & 0x3f) | 0x80);

      (*fromP)++;

    }

    else {

      if (*toP == toLim)

        break;

      *(*toP)++ = *(*fromP)++;

    }

  }

}

static void PTRCALL

latin1_toUtf16(const ENCODING *enc,

               const char **fromP, const char *fromLim,

               unsigned short **toP, const unsigned short *toLim)

{

  while (*fromP != fromLim && *toP != toLim)

    *(*toP)++ = (unsigned char)*(*fromP)++;

}

#ifdef XML_NS

static const struct normal_encoding latin1_encoding_ns = {

  { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },

  {

#include "asciitab.h"

#include "latin1tab.h"

  },

  STANDARD_VTABLE(sb_)

};

#endif

static const struct normal_encoding latin1_encoding = {

  { VTABLE1, latin1_toUtf8, latin1_toUtf16, 1, 0, 0 },

  {

#define BT_COLON BT_NMSTRT

#include "asciitab.h"

#undef BT_COLON

#include "latin1tab.h"

  },

  STANDARD_VTABLE(sb_)

};

static void PTRCALL

ascii_toUtf8(const ENCODING *enc,

             const char **fromP, const char *fromLim,

             char **toP, const char *toLim)

{

  while (*fromP != fromLim && *toP != toLim)

    *(*toP)++ = *(*fromP)++;

}

#ifdef XML_NS

static const struct normal_encoding ascii_encoding_ns = {

  { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },

  {

#include "asciitab.h"

/* BT_NONXML == 0 */

  },

  STANDARD_VTABLE(sb_)

};

#endif

static const struct normal_encoding ascii_encoding = {

  { VTABLE1, ascii_toUtf8, latin1_toUtf16, 1, 1, 0 },

  {

#define BT_COLON BT_NMSTRT

#include "asciitab.h"

#undef BT_COLON

/* BT_NONXML == 0 */

  },

  STANDARD_VTABLE(sb_)

};

static int PTRFASTCALL

unicode_byte_type(char hi, char lo)

{

  switch ((unsigned char)hi) {

  case 0xD8: case 0xD9: case 0xDA: case 0xDB:

    return BT_LEAD4;

  case 0xDC: case 0xDD: case 0xDE: case 0xDF:

    return BT_TRAIL;

  case 0xFF:

    switch ((unsigned char)lo) {

    case 0xFF:

    case 0xFE:

      return BT_NONXML;

    }

    break;