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/*
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
License for the specific language governing rights and limitations
under the License.

The Original Code is expat.

The Initial Developer of the Original Code is James Clark.
Portions created by James Clark are Copyright (C) 1998, 1999
James Clark. All Rights Reserved.

Contributor(s):

Alternatively, the contents of this file may be used under the terms
of the GNU General Public License (the "GPL"), in which case the
provisions of the GPL are applicable instead of those above.  If you
wish to allow use of your version of this file only under the terms of
the GPL and not to allow others to use your version of this file under
the MPL, indicate your decision by deleting the provisions above and
replace them with the notice and other provisions required by the
GPL. If you do not delete the provisions above, a recipient may use
your version of this file under either the MPL or the GPL.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xmldef.h"
#include "xmltok.h"
#include "nametab.h"

#define VTABLE1 \
  { PREFIX(prologTok), PREFIX(contentTok), PREFIX(cdataSectionTok) }, \
  { 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))

#define UTF8_INVALID3(p) \
  ((*p) == 0xED \
  ? (((p)[1] & 0x20) != 0) \
  : ((*p) == 0xEF \
     ? ((p)[1] == 0xBF && ((p)[2] == 0xBF || (p)[2] == 0xBE)) \
     : 0))

#define UTF8_INVALID4(p) ((*p) == 0xF4 && ((p)[1] & 0x30) != 0)

static
int isNever(const ENCODING *enc, const char *p)
{
  return 0;
}

static
int utf8_isName2(const ENCODING *enc, const char *p)
{
  return UTF8_GET_NAMING2(namePages, (const unsigned char *)p);
}

static
int utf8_isName3(const ENCODING *enc, const char *p)
{
  return UTF8_GET_NAMING3(namePages, (const unsigned char *)p);
}

#define utf8_isName4 isNever

static
int utf8_isNmstrt2(const ENCODING *enc, const char *p)
{
  return UTF8_GET_NAMING2(nmstrtPages, (const unsigned char *)p);
}

static
int utf8_isNmstrt3(const ENCODING *enc, const char *p)
{
  return UTF8_GET_NAMING3(nmstrtPages, (const unsigned char *)p);
}

#define utf8_isNmstrt4 isNever

#define utf8_isInvalid2 isNever

static
int utf8_isInvalid3(const ENCODING *enc, const char *p)
{
  return UTF8_INVALID3((const unsigned char *)p);
}

static
int 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 (*byteType)(const ENCODING *, const char *);
  int (*isNameMin)(const ENCODING *, const char *);
  int (*isNmstrtMin)(const ENCODING *, const char *);
  int (*byteToAscii)(const ENCODING *, const char *);
  int (*charMatches)(const ENCODING *, const char *, int);
#endif /* XML_MIN_SIZE */
  int (*isName2)(const ENCODING *, const char *);
  int (*isName3)(const ENCODING *, const char *);
  int (*isName4)(const ENCODING *, const char *);
  int (*isNmstrt2)(const ENCODING *, const char *);
  int (*isNmstrt3)(const ENCODING *, const char *);
  int (*isNmstrt4)(const ENCODING *, const char *);
  int (*isInvalid2)(const ENCODING *, const char *);
  int (*isInvalid3)(const ENCODING *, const char *);
  int (*isInvalid4)(const ENCODING *, const char *);
};

#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 checkCharRefNumber(int);

#include "xmltok_impl.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 sb_byteType(const ENCODING *enc, const char *p)
{
  return SB_BYTE_TYPE(enc, p);
}
#define BYTE_TYPE(enc, p) \
 (((const struct 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) \
 (((const struct normal_encoding *)(enc))->byteToAscii(enc, p))
static
int 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) \
 (((const struct normal_encoding *)(enc))->isName ## n(enc, p))
#define IS_NMSTRT_CHAR(enc, p, n) \
 (((const struct normal_encoding *)(enc))->isNmstrt ## n(enc, p))
#define IS_INVALID_CHAR(enc, p, n) \
 (((const struct normal_encoding *)(enc))->isInvalid ## n(enc, p))

#ifdef XML_MIN_SIZE
#define IS_NAME_CHAR_MINBPC(enc, p) \
 (((const struct normal_encoding *)(enc))->isNameMin(enc, p))
#define IS_NMSTRT_CHAR_MINBPC(enc, p) \
 (((const struct 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) \
 (((const struct normal_encoding *)(enc))->charMatches(enc, p, c))
static
int 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 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 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++ = ((from[0] & 0x1f) << 6) | (from[1] & 0x3f);
      from += 2;
      break;
    case BT_LEAD3:
      *to++ = ((from[0] & 0xf) << 12) | ((from[1] & 0x3f) << 6) | (from[2] & 0x3f);
      from += 3;
      break;
    case BT_LEAD4:
      {
        unsigned long n;
        if (to + 1 == toLim)
          break;
        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;
    }
  }
  *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 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)++ = ((c >> 6) | UTF8_cval2);
      *(*toP)++ = ((c & 0x3f) | 0x80);
      (*fromP)++;
    }
    else {
      if (*toP == toLim)
        break;
      *(*toP)++ = *(*fromP)++;
    }
  }
}

static
void 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 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 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;
  }
  return BT_NONASCII;
}

#define DEFINE_UTF16_TO_UTF8(E) \
static \
void E ## toUtf8(const ENCODING *enc, \
                 const char **fromP, const char *fromLim, \
                 char **toP, const char *toLim) \
{ \
  const char *from; \
  for (from = *fromP; from != fromLim; from += 2) { \
    int plane; \
    unsigned char lo2; \
    unsigned char lo = GET_LO(from); \
    unsigned char hi = GET_HI(from); \
    switch (hi) { \
    case 0: \
      if (lo < 0x80) { \
        if (*toP == toLim) { \
          *fromP = from; \
          return; \
        } \
        *(*toP)++ = lo; \
        break; \
      } \
      /* fall through */ \
    case 0x1: case 0x2: case 0x3: \
    case 0x4: case 0x5: case 0x6: case 0x7: \
      if (toLim -  *toP < 2) { \
        *fromP = from; \
        return; \
      } \
      *(*toP)++ = ((lo >> 6) | (hi << 2) |  UTF8_cval2); \
      *(*toP)++ = ((lo & 0x3f) | 0x80); \
      break; \
    default: \
      if (toLim -  *toP < 3)  { \
        *fromP = from; \
        return; \
      } \
      /* 16 bits divided 4, 6, 6 amongst 3 bytes */ \
      *(*toP)++ = ((hi >> 4) | UTF8_cval3); \
      *(*toP)++ = (((hi & 0xf) << 2) | (lo >> 6) | 0x80); \
      *(*toP)++ = ((lo & 0x3f) | 0x80); \
      break; \
    case 0xD8: case 0xD9: case 0xDA: case 0xDB: \
      if (toLim -  *toP < 4) { \
        *fromP = from; \
        return; \
      } \
      plane = (((hi & 0x3) << 2) | ((lo >> 6) & 0x3)) + 1; \
      *(*toP)++ = ((plane >> 2) | UTF8_cval4); \
      *(*toP)++ = (((lo >> 2) & 0xF) | ((plane & 0x3) << 4) | 0x80); \
      from += 2; \
      lo2 = GET_LO(from); \
      *(*toP)++ = (((lo & 0x3) << 4) \
                   | ((GET_HI(from) & 0x3) << 2) \
                   | (lo2 >> 6) \
                   | 0x80); \
      *(*toP)++ = ((lo2 & 0x3f) | 0x80); \
      break; \
    } \
  } \
  *fromP = from; \
}

#define DEFINE_UTF16_TO_UTF16(E) \
static \
void E ## toUtf16(const ENCODING *enc, \
                  const char **fromP, const char *fromLim, \
                  unsigned short **toP, const unsigned short *toLim) \
{ \
  /* Avoid copying first half only of surrogate */ \
  if (fromLim - *fromP > ((toLim - *toP) << 1) \
      && (GET_HI(fromLim - 2) & 0xF8) == 0xD8) \
    fromLim -= 2; \
  for (; *fromP != fromLim && *toP != toLim; *fromP += 2) \
    *(*toP)++ = (GET_HI(*fromP) << 8) | GET_LO(*fromP); \
}

#define SET2(ptr, ch) \
  (((ptr)[0] = ((ch) & 0xff)), ((ptr)[1] = ((ch) >> 8)))
#define GET_LO(ptr) ((unsigned char)(ptr)[0])
#define GET_HI(ptr) ((unsigned char)(ptr)[1])

DEFINE_UTF16_TO_UTF8(little2_)
DEFINE_UTF16_TO_UTF16(little2_)

#undef SET2
#undef GET_LO
#undef GET_HI

#define SET2(ptr, ch) \
  (((ptr)[0] = ((ch) >> 8)), ((ptr)[1] = ((ch) & 0xFF)))
#define GET_LO(ptr) ((unsigned char)(ptr)[1])
#define GET_HI(ptr) ((unsigned char)(ptr)[0])

DEFINE_UTF16_TO_UTF8(big2_)
DEFINE_UTF16_TO_UTF16(big2_)

#undef SET2
#undef GET_LO
#undef GET_HI

#define LITTLE2_BYTE_TYPE(enc, p) \
 ((p)[1] == 0 \
  ? ((struct normal_encoding *)(enc))->type[(unsigned char)*(p)] \
  : unicode_byte_type((p)[1], (p)[0]))
#define LITTLE2_BYTE_TO_ASCII(enc, p) ((p)[1] == 0 ? (p)[0] : -1)
#define LITTLE2_CHAR_MATCHES(enc, p, c) ((p)[1] == 0 && (p)[0] == c)
#define LITTLE2_IS_NAME_CHAR_MINBPC(enc, p) \
  UCS2_GET_NAMING(namePages, (unsigned char)p[1], (unsigned char)p[0])
#define LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
  UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[1], (unsigned char)p[0])

#ifdef XML_MIN_SIZE

static
int little2_byteType(const ENCODING *enc, const char *p)
{
  return LITTLE2_BYTE_TYPE(enc, p);
}

static
int little2_byteToAscii(const ENCODING *enc, const char *p)
{
  return LITTLE2_BYTE_TO_ASCII(enc, p);
}

static
int little2_charMatches(const ENCODING *enc, const char *p, int c)
{
  return LITTLE2_CHAR_MATCHES(enc, p, c);
}

static
int little2_isNameMin(const ENCODING *enc, const char *p)
{
  return LITTLE2_IS_NAME_CHAR_MINBPC(enc, p);
}

static
int little2_isNmstrtMin(const ENCODING *enc, const char *p)
{
  return LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p);
}

#undef VTABLE
#define VTABLE VTABLE1, little2_toUtf8, little2_toUtf16

#else /* not XML_MIN_SIZE */

#undef PREFIX
#define PREFIX(ident) little2_ ## ident
#define MINBPC(enc) 2
/* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
#define BYTE_TYPE(enc, p) LITTLE2_BYTE_TYPE(enc, p)
#define BYTE_TO_ASCII(enc, p) LITTLE2_BYTE_TO_ASCII(enc, p) 
#define CHAR_MATCHES(enc, p, c) LITTLE2_CHAR_MATCHES(enc, p, c)
#define IS_NAME_CHAR(enc, p, n) 0
#define IS_NAME_CHAR_MINBPC(enc, p) LITTLE2_IS_NAME_CHAR_MINBPC(enc, p)
#define IS_NMSTRT_CHAR(enc, p, n) (0)
#define IS_NMSTRT_CHAR_MINBPC(enc, p) LITTLE2_IS_NMSTRT_CHAR_MINBPC(enc, p)

#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

#endif /* not XML_MIN_SIZE */

#ifdef XML_NS

static const struct normal_encoding little2_encoding_ns = { 
  { VTABLE, 2, 0,
#if XML_BYTE_ORDER == 12
    1
#else
    0
#endif
  },
  {
#include "asciitab.h"
#include "latin1tab.h"
  },
  STANDARD_VTABLE(little2_)
};

#endif

static const struct normal_encoding little2_encoding = { 
  { VTABLE, 2, 0,
#if XML_BYTE_ORDER == 12
    1
#else
    0
#endif
  },
  {
#define BT_COLON BT_NMSTRT
#include "asciitab.h"
#undef BT_COLON
#include "latin1tab.h"
  },
  STANDARD_VTABLE(little2_)
};

#if XML_BYTE_ORDER != 21

#ifdef XML_NS

static const struct normal_encoding internal_little2_encoding_ns = { 
  { VTABLE, 2, 0, 1 },
  {
#include "iasciitab.h"
#include "latin1tab.h"
  },
  STANDARD_VTABLE(little2_)
};

#endif

static const struct normal_encoding internal_little2_encoding = { 
  { VTABLE, 2, 0, 1 },
  {
#define BT_COLON BT_NMSTRT
#include "iasciitab.h"
#undef BT_COLON
#include "latin1tab.h"
  },
  STANDARD_VTABLE(little2_)
};

#endif


#define BIG2_BYTE_TYPE(enc, p) \
 ((p)[0] == 0 \
  ? ((struct normal_encoding *)(enc))->type[(unsigned char)(p)[1]] \
  : unicode_byte_type((p)[0], (p)[1]))
#define BIG2_BYTE_TO_ASCII(enc, p) ((p)[0] == 0 ? (p)[1] : -1)
#define BIG2_CHAR_MATCHES(enc, p, c) ((p)[0] == 0 && (p)[1] == c)
#define BIG2_IS_NAME_CHAR_MINBPC(enc, p) \
  UCS2_GET_NAMING(namePages, (unsigned char)p[0], (unsigned char)p[1])
#define BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p) \
  UCS2_GET_NAMING(nmstrtPages, (unsigned char)p[0], (unsigned char)p[1])

#ifdef XML_MIN_SIZE

static
int big2_byteType(const ENCODING *enc, const char *p)
{
  return BIG2_BYTE_TYPE(enc, p);
}

static
int big2_byteToAscii(const ENCODING *enc, const char *p)
{
  return BIG2_BYTE_TO_ASCII(enc, p);
}

static
int big2_charMatches(const ENCODING *enc, const char *p, int c)
{
  return BIG2_CHAR_MATCHES(enc, p, c);
}

static
int big2_isNameMin(const ENCODING *enc, const char *p)
{
  return BIG2_IS_NAME_CHAR_MINBPC(enc, p);
}

static
int big2_isNmstrtMin(const ENCODING *enc, const char *p)
{
  return BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p);
}

#undef VTABLE
#define VTABLE VTABLE1, big2_toUtf8, big2_toUtf16

#else /* not XML_MIN_SIZE */

#undef PREFIX
#define PREFIX(ident) big2_ ## ident
#define MINBPC(enc) 2
/* CHAR_MATCHES is guaranteed to have MINBPC bytes available. */
#define BYTE_TYPE(enc, p) BIG2_BYTE_TYPE(enc, p)
#define BYTE_TO_ASCII(enc, p) BIG2_BYTE_TO_ASCII(enc, p) 
#define CHAR_MATCHES(enc, p, c) BIG2_CHAR_MATCHES(enc, p, c)
#define IS_NAME_CHAR(enc, p, n) 0
#define IS_NAME_CHAR_MINBPC(enc, p) BIG2_IS_NAME_CHAR_MINBPC(enc, p)
#define IS_NMSTRT_CHAR(enc, p, n) (0)
#define IS_NMSTRT_CHAR_MINBPC(enc, p) BIG2_IS_NMSTRT_CHAR_MINBPC(enc, p)

#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

#endif /* not XML_MIN_SIZE */

#ifdef XML_NS

static const struct normal_encoding big2_encoding_ns = {
  { VTABLE, 2, 0,
#if XML_BYTE_ORDER == 21
  1
#else
  0
#endif
  },
  {
#include "asciitab.h"
#include "latin1tab.h"
  },
  STANDARD_VTABLE(big2_)
};

#endif

static const struct normal_encoding big2_encoding = {
  { VTABLE, 2, 0,
#if XML_BYTE_ORDER == 21
  1
#else
  0
#endif
  },
  {
#define BT_COLON BT_NMSTRT
#include "asciitab.h"
#undef BT_COLON
#include "latin1tab.h"
  },
  STANDARD_VTABLE(big2_)
};

#if XML_BYTE_ORDER != 12

#ifdef XML_NS

static const struct normal_encoding internal_big2_encoding_ns = {
  { VTABLE, 2, 0, 1 },
  {
#include "iasciitab.h"
#include "latin1tab.h"
  },
  STANDARD_VTABLE(big2_)
};

#endif

static const struct normal_encoding internal_big2_encoding = {
  { VTABLE, 2, 0, 1 },
  {
#define BT_COLON BT_NMSTRT
#include "iasciitab.h"
#undef BT_COLON
#include "latin1tab.h"
  },
  STANDARD_VTABLE(big2_)
};

#endif

#undef PREFIX

static
int streqci(const char *s1, const char *s2)
{
  for (;;) {
    char c1 = *s1++;
    char c2 = *s2++;
    if ('a' <= c1 && c1 <= 'z')
      c1 += 'A' - 'a';
    if ('a' <= c2 && c2 <= 'z')
      c2 += 'A' - 'a';
    if (c1 != c2)
      return 0;
    if (!c1)
      break;
  }
  return 1;
}

static
void initUpdatePosition(const ENCODING *enc, const char *ptr,
                        const char *end, POSITION *pos)
{
  normal_updatePosition(&utf8_encoding.enc, ptr, end, pos);
}

static
int toAscii(const ENCODING *enc, const char *ptr, const char *end)
{
  char buf[1];
  char *p = buf;
  XmlUtf8Convert(enc, &ptr, end, &p, p + 1);
  if (p == buf)
    return -1;
  else
    return buf[0];
}

static
int isSpace(int c)
{
  switch (c) {
  case 0x20:
  case 0xD:
  case 0xA:
  case 0x9:     
    return 1;
  }
  return 0;
}

/* Return 1 if there's just optional white space
or there's an S followed by name=val. */
static
int parsePseudoAttribute(const ENCODING *enc,
                         const char *ptr,
                         const char *end,
                         const char **namePtr,
                         const char **valPtr,
                         const char **nextTokPtr)
{
  int c;
  char open;
  if (ptr == end) {
    *namePtr = 0;
    return 1;
  }
  if (!isSpace(toAscii(enc, ptr, end))) {
    *nextTokPtr = ptr;
    return 0;
  }
  do {
    ptr += enc->minBytesPerChar;
  } while (isSpace(toAscii(enc, ptr, end)));
  if (ptr == end) {
    *namePtr = 0;
    return 1;
  }
  *namePtr = ptr;
  for (;;) {
    c = toAscii(enc, ptr, end);
    if (c == -1) {
      *nextTokPtr = ptr;
      return 0;
    }
    if (c == '=')
      break;
    if (isSpace(c)) {
      do {
        ptr += enc->minBytesPerChar;
      } while (isSpace(c = toAscii(enc, ptr, end)));
      if (c != '=') {
        *nextTokPtr = ptr;
        return 0;
      }
      break;
    }
    ptr += enc->minBytesPerChar;
  }
  if (ptr == *namePtr) {
    *nextTokPtr = ptr;
    return 0;
  }
  ptr += enc->minBytesPerChar;
  c = toAscii(enc, ptr, end);
  while (isSpace(c)) {
    ptr += enc->minBytesPerChar;
    c = toAscii(enc, ptr, end);
  }
  if (c != '"' && c != '\'') {
    *nextTokPtr = ptr;
    return 0;
  }
  open = c;
  ptr += enc->minBytesPerChar;
  *valPtr = ptr;
  for (;; ptr += enc->minBytesPerChar) {
    c = toAscii(enc, ptr, end);
    if (c == open)
      break;
    if (!('a' <= c && c <= 'z')
        && !('A' <= c && c <= 'Z')
        && !('0' <= c && c <= '9')
        && c != '.'
        && c != '-'
        && c != '_') {
      *nextTokPtr = ptr;
      return 0;
    }
  }
  *nextTokPtr = ptr + enc->minBytesPerChar;
  return 1;
}

static
int doParseXmlDecl(const ENCODING *(*encodingFinder)(const ENCODING *,
                                                     const char *,
                                                     const char *),
                   int isGeneralTextEntity,
                   const ENCODING *enc,
                   const char *ptr,
                   const char *end,
                   const char **badPtr,
                   const char **versionPtr,
                   const char **encodingName,
                   const ENCODING **encoding,
                   int *standalone)
{
  const char *val = 0;
  const char *name = 0;
  ptr += 5 * enc->minBytesPerChar;
  end -= 2 * enc->minBytesPerChar;
  if (!parsePseudoAttribute(enc, ptr, end, &name, &val, &ptr) || !name) {
    *badPtr = ptr;
    return 0;
  }
  if (!XmlNameMatchesAscii(enc, name, "version")) {
    if (!isGeneralTextEntity) {
      *badPtr = name;
      return 0;
    }
  }
  else {
    if (versionPtr)
      *versionPtr = val;
    if (!parsePseudoAttribute(enc, ptr, end, &name, &val, &ptr)) {
      *badPtr = ptr;
      return 0;
    }
    if (!name) {
      if (isGeneralTextEntity) {
        /* a TextDecl must have an EncodingDecl */
        *badPtr = ptr;
        return 0;
      }
      return 1;
    }
  }
  if (XmlNameMatchesAscii(enc, name, "encoding")) {
    int c = toAscii(enc, val, end);
    if (!('a' <= c && c <= 'z') && !('A' <= c && c <= 'Z')) {
      *badPtr = val;
      return 0;
    }
    if (encodingName)
      *encodingName = val;
    if (encoding)
      *encoding = encodingFinder(enc, val, ptr - enc->minBytesPerChar);
    if (!parsePseudoAttribute(enc, ptr, end, &name, &val, &ptr)) {
      *badPtr = ptr;
      return 0;
    }
    if (!name)
      return 1;
  }
  if (!XmlNameMatchesAscii(enc, name, "standalone") || isGeneralTextEntity) {
    *badPtr = name;
    return 0;
  }
  if (XmlNameMatchesAscii(enc, val, "yes")) {
    if (standalone)
      *standalone = 1;
  }
  else if (XmlNameMatchesAscii(enc, val, "no")) {
    if (standalone)
      *standalone = 0;
  }
  else {
    *badPtr = val;
    return 0;
  }
  while (isSpace(toAscii(enc, ptr, end)))
    ptr += enc->minBytesPerChar;
  if (ptr != end) {
    *badPtr = ptr;
    return 0;
  }
  return 1;
}

static
int checkCharRefNumber(int result)
{
  switch (result >> 8) {
  case 0xD8: case 0xD9: case 0xDA: case 0xDB:
  case 0xDC: case 0xDD: case 0xDE: case 0xDF:
    return -1;
  case 0:
    if (latin1_encoding.type[result] == BT_NONXML)
      return -1;
    break;
  case 0xFF:
    if (result == 0xFFFE || result == 0xFFFF)
      return -1;
    break;
  }
  return result;
}

int XmlUtf8Encode(int c, char *buf)
{
  enum {
    /* minN is minimum legal resulting value for N byte sequence */
    min2 = 0x80,
    min3 = 0x800,
    min4 = 0x10000
  };

  if (c < 0)
    return 0;
  if (c < min2) {
    buf[0] = (c | UTF8_cval1);
    return 1;
  }
  if (c < min3) {
    buf[0] = ((c >> 6) | UTF8_cval2);
    buf[1] = ((c & 0x3f) | 0x80);
    return 2;
  }
  if (c < min4) {
    buf[0] = ((c >> 12) | UTF8_cval3);
    buf[1] = (((c >> 6) & 0x3f) | 0x80);
    buf[2] = ((c & 0x3f) | 0x80);
    return 3;
  }
  if (c < 0x110000) {
    buf[0] = ((c >> 18) | UTF8_cval4);
    buf[1] = (((c >> 12) & 0x3f) | 0x80);
    buf[2] = (((c >> 6) & 0x3f) | 0x80);
    buf[3] = ((c & 0x3f) | 0x80);
    return 4;
  }
  return 0;
}

int XmlUtf16Encode(int charNum, unsigned short *buf)
{
  if (charNum < 0)
    return 0;
  if (charNum < 0x10000) {
    buf[0] = charNum;
    return 1;
  }
  if (charNum < 0x110000) {
    charNum -= 0x10000;
    buf[0] = (charNum >> 10) + 0xD800;
    buf[1] = (charNum & 0x3FF) + 0xDC00;
    return 2;
  }
  return 0;
}

struct unknown_encoding {
  struct normal_encoding normal;
  int (*convert)(void *userData, const char *p);
  void *userData;
  unsigned short utf16[256];
  char utf8[256][4];
};

int XmlSizeOfUnknownEncoding()
{
  return sizeof(struct unknown_encoding);
}

static
int unknown_isName(const ENCODING *enc, const char *p)
{
  int c = ((const struct unknown_encoding *)enc)
          ->convert(((const struct unknown_encoding *)enc)->userData, p);
  if (c & ~0xFFFF)
    return 0;
  return UCS2_GET_NAMING(namePages, c >> 8, c & 0xFF);
}

static
int unknown_isNmstrt(const ENCODING *enc, const char *p)
{
  int c = ((const struct unknown_encoding *)enc)
          ->convert(((const struct unknown_encoding *)enc)->userData, p);
  if (c & ~0xFFFF)
    return 0;
  return UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xFF);
}

static
int unknown_isInvalid(const ENCODING *enc, const char *p)
{
  int c = ((const struct unknown_encoding *)enc)
           ->convert(((const struct unknown_encoding *)enc)->userData, p);
  return (c & ~0xFFFF) || checkCharRefNumber(c) < 0;
}

static
void unknown_toUtf8(const ENCODING *enc,
                    const char **fromP, const char *fromLim,
                    char **toP, const char *toLim)
{
  char buf[XML_UTF8_ENCODE_MAX];
  for (;;) {
    const char *utf8;
    int n;
    if (*fromP == fromLim)
      break;
    utf8 = ((const struct unknown_encoding *)enc)->utf8[(unsigned char)**fromP];
    n = *utf8++;
    if (n == 0) {
      int c = ((const struct unknown_encoding *)enc)
              ->convert(((const struct unknown_encoding *)enc)->userData, *fromP);
      n = XmlUtf8Encode(c, buf);
      if (n > toLim - *toP)
        break;
      utf8 = buf;
      *fromP += ((const struct normal_encoding *)enc)->type[(unsigned char)**fromP]
                 - (BT_LEAD2 - 2);
    }
    else {
      if (n > toLim - *toP)
        break;
      (*fromP)++;
    }
    do {
      *(*toP)++ = *utf8++;
    } while (--n != 0);
  }
}

static
void unknown_toUtf16(const ENCODING *enc,
                     const char **fromP, const char *fromLim,
                     unsigned short **toP, const unsigned short *toLim)
{
  while (*fromP != fromLim && *toP != toLim) {
    unsigned short c
      = ((const struct unknown_encoding *)enc)->utf16[(unsigned char)**fromP];
    if (c == 0) {
      c = (unsigned short)((const struct unknown_encoding *)enc)
           ->convert(((const struct unknown_encoding *)enc)->userData, *fromP);
      *fromP += ((const struct normal_encoding *)enc)->type[(unsigned char)**fromP]
                 - (BT_LEAD2 - 2);
    }
    else
      (*fromP)++;
    *(*toP)++ = c;
  }
}

ENCODING *
XmlInitUnknownEncoding(void *mem,
                       int *table,
                       int (*convert)(void *userData, const char *p),
                       void *userData)
{
  int i;
  struct unknown_encoding *e = mem;
  for (i = 0; i < sizeof(struct normal_encoding); i++)
    ((char *)mem)[i] = ((char *)&latin1_encoding)[i];
  for (i = 0; i < 128; i++)
    if (latin1_encoding.type[i] != BT_OTHER
        && latin1_encoding.type[i] != BT_NONXML
        && table[i] != i)
      return 0;
  for (i = 0; i < 256; i++) {
    int c = table[i];
    if (c == -1) {
      e->normal.type[i] = BT_MALFORM;
      /* This shouldn't really get used. */
      e->utf16[i] = 0xFFFF;
      e->utf8[i][0] = 1;
      e->utf8[i][1] = 0;
    }
    else if (c < 0) {
      if (c < -4)
        return 0;
      e->normal.type[i] = BT_LEAD2 - (c + 2);
      e->utf8[i][0] = 0;
      e->utf16[i] = 0;
    }
    else if (c < 0x80) {
      if (latin1_encoding.type[c] != BT_OTHER
          && latin1_encoding.type[c] != BT_NONXML
          && c != i)
        return 0;
      e->normal.type[i] = latin1_encoding.type[c];
      e->utf8[i][0] = 1;
      e->utf8[i][1] = (char)c;
      e->utf16[i] = c == 0 ? 0xFFFF : c;
    }
    else if (checkCharRefNumber(c) < 0) {
      e->normal.type[i] = BT_NONXML;
      /* This shouldn't really get used. */
      e->utf16[i] = 0xFFFF;
      e->utf8[i][0] = 1;
      e->utf8[i][1] = 0;
    }
    else {
      if (c > 0xFFFF)
        return 0;
      if (UCS2_GET_NAMING(nmstrtPages, c >> 8, c & 0xff))
        e->normal.type[i] = BT_NMSTRT;
      else if (UCS2_GET_NAMING(namePages, c >> 8, c & 0xff))
        e->normal.type[i] = BT_NAME;
      else
        e->normal.type[i] = BT_OTHER;
      e->utf8[i][0] = (char)XmlUtf8Encode(c, e->utf8[i] + 1);
      e->utf16[i] = c;
    }
  }
  e->userData = userData;
  e->convert = convert;
  if (convert) {
    e->normal.isName2 = unknown_isName;
    e->normal.isName3 = unknown_isName;
    e->normal.isName4 = unknown_isName;
    e->normal.isNmstrt2 = unknown_isNmstrt;
    e->normal.isNmstrt3 = unknown_isNmstrt;
    e->normal.isNmstrt4 = unknown_isNmstrt;
    e->normal.isInvalid2 = unknown_isInvalid;
    e->normal.isInvalid3 = unknown_isInvalid;
    e->normal.isInvalid4 = unknown_isInvalid;
  }
  e->normal.enc.utf8Convert = unknown_toUtf8;
  e->normal.enc.utf16Convert = unknown_toUtf16;
  return &(e->normal.enc);
}

/* If this enumeration is changed, getEncodingIndex and encodings
must also be changed. */
enum {
  UNKNOWN_ENC = -1,
  ISO_8859_1_ENC = 0,
  US_ASCII_ENC,
  UTF_8_ENC,
  UTF_16_ENC,
  UTF_16BE_ENC,
  UTF_16LE_ENC,
  /* must match encodingNames up to here */
  NO_ENC
};

static
int getEncodingIndex(const char *name)
{
  static const char *encodingNames[] = {
    "ISO-8859-1",
    "US-ASCII",
    "UTF-8",
    "UTF-16",
    "UTF-16BE"
    "UTF-16LE",
  };
  int i;
  if (name == 0)
    return NO_ENC;
  for (i = 0; i < sizeof(encodingNames)/sizeof(encodingNames[0]); i++)
    if (streqci(name, encodingNames[i]))
      return i;
  return UNKNOWN_ENC;
}

/* For binary compatibility, we store the index of the encoding specified
at initialization in the isUtf16 member. */

#define INIT_ENC_INDEX(enc) ((enc)->initEnc.isUtf16)

/* This is what detects the encoding.
encodingTable maps from encoding indices to encodings;
INIT_ENC_INDEX(enc) is the index of the external (protocol) specified encoding;
state is XML_CONTENT_STATE if we're parsing an external text entity,
and XML_PROLOG_STATE otherwise.
*/


static
int initScan(const ENCODING **encodingTable,
             const INIT_ENCODING *enc,
             int state,
             const char *ptr,
             const char *end,
             const char **nextTokPtr)
{
  const ENCODING **encPtr;

  if (ptr == end)
    return XML_TOK_NONE;
  encPtr = enc->encPtr;
  if (ptr + 1 == end) {
    /* only a single byte available for auto-detection */
    /* a well-formed document entity must have more than one byte */
    if (state != XML_CONTENT_STATE)
      return XML_TOK_PARTIAL;
    /* so we're parsing an external text entity... */
    /* if UTF-16 was externally specified, then we need at least 2 bytes */
    switch (INIT_ENC_INDEX(enc)) {
    case UTF_16_ENC:
    case UTF_16LE_ENC:
    case UTF_16BE_ENC:
      return XML_TOK_PARTIAL;
    }
    switch ((unsigned char)*ptr) {
    case 0xFE:
    case 0xFF:
    case 0xEF: /* possibly first byte of UTF-8 BOM */
      if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
          && state == XML_CONTENT_STATE)
        break;
      /* fall through */
    case 0x00:
    case 0x3C:
      return XML_TOK_PARTIAL;
    }
  }
  else {
    switch (((unsigned char)ptr[0] << 8) | (unsigned char)ptr[1]) {
    case 0xFEFF:
      if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
          && state == XML_CONTENT_STATE)
        break;
      *nextTokPtr = ptr + 2;
      *encPtr = encodingTable[UTF_16BE_ENC];
      return XML_TOK_BOM;
    /* 00 3C is handled in the default case */
    case 0x3C00:
      if ((INIT_ENC_INDEX(enc) == UTF_16BE_ENC
           || INIT_ENC_INDEX(enc) == UTF_16_ENC)
          && state == XML_CONTENT_STATE)
        break;
      *encPtr = encodingTable[UTF_16LE_ENC];
      return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
    case 0xFFFE:
      if (INIT_ENC_INDEX(enc) == ISO_8859_1_ENC
          && state == XML_CONTENT_STATE)
        break;
      *nextTokPtr = ptr + 2;
      *encPtr = encodingTable[UTF_16LE_ENC];
      return XML_TOK_BOM;
    case 0xEFBB:
      /* Maybe a UTF-8 BOM (EF BB BF) */
      /* If there's an explicitly specified (external) encoding
         of ISO-8859-1 or some flavour of UTF-16
         and this is an external text entity,
         don't look for the BOM,
         because it might be a legal data. */
      if (state == XML_CONTENT_STATE) {
        int e = INIT_ENC_INDEX(enc);
        if (e == ISO_8859_1_ENC || e == UTF_16BE_ENC || e == UTF_16LE_ENC || e == UTF_16_ENC)
          break;
      }
      if (ptr + 2 == end)
        return XML_TOK_PARTIAL;
      if ((unsigned char)ptr[2] == 0xBF) {
        *encPtr = encodingTable[UTF_8_ENC];
        return XML_TOK_BOM;
      }
      break;
    default:
      if (ptr[0] == '\0') {
        /* 0 isn't a legal data character. Furthermore a document entity can only
           start with ASCII characters.  So the only way this can fail to be big-endian
           UTF-16 if it it's an external parsed general entity that's labelled as
           UTF-16LE. */
        if (state == XML_CONTENT_STATE && INIT_ENC_INDEX(enc) == UTF_16LE_ENC)
          break;
        *encPtr = encodingTable[UTF_16BE_ENC];
        return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
      }
      else if (ptr[1] == '\0') {
        /* We could recover here in the case:
            - parsing an external entity
            - second byte is 0
            - no externally specified encoding
            - no encoding declaration
           by assuming UTF-16LE.  But we don't, because this would mean when
           presented just with a single byte, we couldn't reliably determine
           whether we needed further bytes. */
        if (state == XML_CONTENT_STATE)
          break;
        *encPtr = encodingTable[UTF_16LE_ENC];
        return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
      }
      break;
    }
  }
  *encPtr = encodingTable[INIT_ENC_INDEX(enc)];
  return XmlTok(*encPtr, state, ptr, end, nextTokPtr);
}


#define NS(x) x
#define ns(x) x
#include "xmltok_ns.c"
#undef NS
#undef ns

#ifdef XML_NS

#define NS(x) x ## NS
#define ns(x) x ## _ns

#include "xmltok_ns.c"

#undef NS
#undef ns

ENCODING *
XmlInitUnknownEncodingNS(void *mem,
                         int *table,
                         int (*convert)(void *userData, const char *p),
                         void *userData)
{
  ENCODING *enc = XmlInitUnknownEncoding(mem, table, convert, userData);
  if (enc)
    ((struct normal_encoding *)enc)->type[':'] = BT_COLON;
  return enc;
}

#endif /* XML_NS */

---