/* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
   See the file COPYING for copying permission.
*/

#ifndef IS_INVALID_CHAR
#define IS_INVALID_CHAR(enc, ptr, n) (0)
#endif

#define INVALID_LEAD_CASE(n, ptr, nextTokPtr) \
    case BT_LEAD ## n: \
      if (end - ptr < n) \
        return XML_TOK_PARTIAL_CHAR; \
      if (IS_INVALID_CHAR(enc, ptr, n)) { \
        *(nextTokPtr) = (ptr); \
        return XML_TOK_INVALID; \
      } \
      ptr += n; \
      break;

#define INVALID_CASES(ptr, nextTokPtr) \
  INVALID_LEAD_CASE(2, ptr, nextTokPtr) \
  INVALID_LEAD_CASE(3, ptr, nextTokPtr) \
  INVALID_LEAD_CASE(4, ptr, nextTokPtr) \
  case BT_NONXML: \
  case BT_MALFORM: \
  case BT_TRAIL: \
    *(nextTokPtr) = (ptr); \
    return XML_TOK_INVALID;

#define CHECK_NAME_CASE(n, enc, ptr, end, nextTokPtr) \
   case BT_LEAD ## n: \
     if (end - ptr < n) \
       return XML_TOK_PARTIAL_CHAR; \
     if (!IS_NAME_CHAR(enc, ptr, n)) { \
       *nextTokPtr = ptr; \
       return XML_TOK_INVALID; \
     } \
     ptr += n; \
     break;

#define CHECK_NAME_CASES(enc, ptr, end, nextTokPtr) \
  case BT_NONASCII: \
    if (!IS_NAME_CHAR_MINBPC(enc, ptr)) { \
      *nextTokPtr = ptr; \
      return XML_TOK_INVALID; \
    } \
  case BT_NMSTRT: \
  case BT_HEX: \
  case BT_DIGIT: \
  case BT_NAME: \
  case BT_MINUS: \
    ptr += MINBPC(enc); \
    break; \
  CHECK_NAME_CASE(2, enc, ptr, end, nextTokPtr) \
  CHECK_NAME_CASE(3, enc, ptr, end, nextTokPtr) \
  CHECK_NAME_CASE(4, enc, ptr, end, nextTokPtr)

#define CHECK_NMSTRT_CASE(n, enc, ptr, end, nextTokPtr) \
   case BT_LEAD ## n: \
     if (end - ptr < n) \
       return XML_TOK_PARTIAL_CHAR; \
     if (!IS_NMSTRT_CHAR(enc, ptr, n)) { \
       *nextTokPtr = ptr; \
       return XML_TOK_INVALID; \
     } \
     ptr += n; \
     break;

#define CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr) \
  case BT_NONASCII: \
    if (!IS_NMSTRT_CHAR_MINBPC(enc, ptr)) { \
      *nextTokPtr = ptr; \
      return XML_TOK_INVALID; \
    } \
  case BT_NMSTRT: \
  case BT_HEX: \
    ptr += MINBPC(enc); \
    break; \
  CHECK_NMSTRT_CASE(2, enc, ptr, end, nextTokPtr) \
  CHECK_NMSTRT_CASE(3, enc, ptr, end, nextTokPtr) \
  CHECK_NMSTRT_CASE(4, enc, ptr, end, nextTokPtr)

#ifndef PREFIX
#define PREFIX(ident) ident
#endif

/* ptr points to character following "<!-" */

static int
PREFIX(scanComment)(const ENCODING *enc, const char *ptr,
                    const char *end, const char **nextTokPtr)
{
  if (ptr != end) {
    if (!CHAR_MATCHES(enc, ptr, ASCII_MINUS)) {
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    ptr += MINBPC(enc);
    while (ptr != end) {
      switch (BYTE_TYPE(enc, ptr)) {
      INVALID_CASES(ptr, nextTokPtr)
      case BT_MINUS:
        if ((ptr += MINBPC(enc)) == end)
          return XML_TOK_PARTIAL;
        if (CHAR_MATCHES(enc, ptr, ASCII_MINUS)) {
          if ((ptr += MINBPC(enc)) == end)
            return XML_TOK_PARTIAL;
          if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
          }
          *nextTokPtr = ptr + MINBPC(enc);
          return XML_TOK_COMMENT;
        }
        break;
      default:
        ptr += MINBPC(enc);
        break;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "<!" */

static int
PREFIX(scanDecl)(const ENCODING *enc, const char *ptr,
                 const char *end, const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_MINUS:
    return PREFIX(scanComment)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_LSQB:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_COND_SECT_OPEN;
  case BT_NMSTRT:
  case BT_HEX:
    ptr += MINBPC(enc);
    break;
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_PERCNT:
      if (ptr + MINBPC(enc) == end)
        return XML_TOK_PARTIAL;
      /* don't allow <!ENTITY% foo "whatever"> */
      switch (BYTE_TYPE(enc, ptr + MINBPC(enc))) {
      case BT_S: case BT_CR: case BT_LF: case BT_PERCNT:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      /* fall through */
    case BT_S: case BT_CR: case BT_LF:
      *nextTokPtr = ptr;
      return XML_TOK_DECL_OPEN;
    case BT_NMSTRT:
    case BT_HEX:
      ptr += MINBPC(enc);
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static int
PREFIX(checkPiTarget)(const ENCODING *enc, const char *ptr,
                      const char *end, int *tokPtr)
{
  int upper = 0;
  *tokPtr = XML_TOK_PI;
  if (end - ptr != MINBPC(enc)*3)
    return 1;
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_x:
    break;
  case ASCII_X:
    upper = 1;
    break;
  default:
    return 1;
  }
  ptr += MINBPC(enc);
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_m:
    break;
  case ASCII_M:
    upper = 1;
    break;
  default:
    return 1;
  }
  ptr += MINBPC(enc);
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_l:
    break;
  case ASCII_L:
    upper = 1;
    break;
  default:
    return 1;
  }
  if (upper)
    return 0;
  *tokPtr = XML_TOK_XML_DECL;
  return 1;
}

/* ptr points to character following "<?" */

static int
PREFIX(scanPi)(const ENCODING *enc, const char *ptr,
               const char *end, const char **nextTokPtr)
{
  int tok;
  const char *target = ptr;
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_S: case BT_CR: case BT_LF:
      if (!PREFIX(checkPiTarget)(enc, target, ptr, &tok)) {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      ptr += MINBPC(enc);
      while (ptr != end) {
        switch (BYTE_TYPE(enc, ptr)) {
        INVALID_CASES(ptr, nextTokPtr)
        case BT_QUEST:
          ptr += MINBPC(enc);
          if (ptr == end)
            return XML_TOK_PARTIAL;
          if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
            *nextTokPtr = ptr + MINBPC(enc);
            return tok;
          }
          break;
        default:
          ptr += MINBPC(enc);
          break;
        }
      }
      return XML_TOK_PARTIAL;
    case BT_QUEST:
      if (!PREFIX(checkPiTarget)(enc, target, ptr, &tok)) {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      ptr += MINBPC(enc);
      if (ptr == end)
        return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
        *nextTokPtr = ptr + MINBPC(enc);
        return tok;
      }
      /* fall through */
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static int
PREFIX(scanCdataSection)(const ENCODING *enc, const char *ptr,
                         const char *end, const char **nextTokPtr)
{
  static const char CDATA_LSQB[] = { ASCII_C, ASCII_D, ASCII_A,
                                     ASCII_T, ASCII_A, ASCII_LSQB };
  int i;
  /* CDATA[ */
  if (end - ptr < 6 * MINBPC(enc))
    return XML_TOK_PARTIAL;
  for (i = 0; i < 6; i++, ptr += MINBPC(enc)) {
    if (!CHAR_MATCHES(enc, ptr, CDATA_LSQB[i])) {
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_CDATA_SECT_OPEN;
}

static int
PREFIX(cdataSectionTok)(const ENCODING *enc, const char *ptr,
                        const char *end, const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_NONE;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      if (n == 0)
        return XML_TOK_PARTIAL;
      end = ptr + n;
    }
  }
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_RSQB:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (!CHAR_MATCHES(enc, ptr, ASCII_RSQB))
      break;
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
      ptr -= MINBPC(enc);
      break;
    }
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_CDATA_SECT_CLOSE;
  case BT_CR:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (BYTE_TYPE(enc, ptr) == BT_LF)
      ptr += MINBPC(enc);
    *nextTokPtr = ptr;
    return XML_TOK_DATA_NEWLINE;
  case BT_LF:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_DATA_NEWLINE;
  INVALID_CASES(ptr, nextTokPtr)
  default:
    ptr += MINBPC(enc);
    break;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      if (end - ptr < n || IS_INVALID_CHAR(enc, ptr, n)) { \
        *nextTokPtr = ptr; \
        return XML_TOK_DATA_CHARS; \
      } \
      ptr += n; \
      break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_NONXML:
    case BT_MALFORM:
    case BT_TRAIL:
    case BT_CR:
    case BT_LF:
    case BT_RSQB:
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

/* ptr points to character following "</" */

static int
PREFIX(scanEndTag)(const ENCODING *enc, const char *ptr,
                   const char *end, const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_S: case BT_CR: case BT_LF:
      for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
        switch (BYTE_TYPE(enc, ptr)) {
        case BT_S: case BT_CR: case BT_LF:
          break;
        case BT_GT:
          *nextTokPtr = ptr + MINBPC(enc);
          return XML_TOK_END_TAG;
        default:
          *nextTokPtr = ptr;
          return XML_TOK_INVALID;
        }
      }
      return XML_TOK_PARTIAL;
#ifdef XML_NS
    case BT_COLON:
      /* no need to check qname syntax here,
         since end-tag must match exactly */
      ptr += MINBPC(enc);
      break;
#endif
    case BT_GT:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_END_TAG;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&#X" */

static int
PREFIX(scanHexCharRef)(const ENCODING *enc, const char *ptr,
                       const char *end, const char **nextTokPtr)
{
  if (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
    case BT_HEX:
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_DIGIT:
      case BT_HEX:
        break;
      case BT_SEMI:
        *nextTokPtr = ptr + MINBPC(enc);
        return XML_TOK_CHAR_REF;
      default:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&#" */

static int
PREFIX(scanCharRef)(const ENCODING *enc, const char *ptr,
                    const char *end, const char **nextTokPtr)
{
  if (ptr != end) {
    if (CHAR_MATCHES(enc, ptr, ASCII_x))
      return PREFIX(scanHexCharRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_DIGIT:
        break;
      case BT_SEMI:
        *nextTokPtr = ptr + MINBPC(enc);
        return XML_TOK_CHAR_REF;
      default:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&" */

static int
PREFIX(scanRef)(const ENCODING *enc, const char *ptr, const char *end,
                const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_NUM:
    return PREFIX(scanCharRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_SEMI:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_ENTITY_REF;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following first character of attribute name */

static int
PREFIX(scanAtts)(const ENCODING *enc, const char *ptr, const char *end,
                 const char **nextTokPtr)
{
#ifdef XML_NS
  int hadColon = 0;
#endif
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
#ifdef XML_NS
    case BT_COLON:
      if (hadColon) {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      hadColon = 1;
      ptr += MINBPC(enc);
      if (ptr == end)
        return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      default:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      break;
#endif
    case BT_S: case BT_CR: case BT_LF:
      for (;;) {
        int t;

        ptr += MINBPC(enc);
        if (ptr == end)
          return XML_TOK_PARTIAL;
        t = BYTE_TYPE(enc, ptr);
        if (t == BT_EQUALS)
          break;
        switch (t) {
        case BT_S:
        case BT_LF:
        case BT_CR:
          break;
        default:
          *nextTokPtr = ptr;
          return XML_TOK_INVALID;
        }
      }
    /* fall through */
    case BT_EQUALS:
      {
        int open;
#ifdef XML_NS
        hadColon = 0;
#endif
        for (;;) {
          ptr += MINBPC(enc);
          if (ptr == end)
            return XML_TOK_PARTIAL;
          open = BYTE_TYPE(enc, ptr);
          if (open == BT_QUOT || open == BT_APOS)
            break;
          switch (open) {
          case BT_S:
          case BT_LF:
          case BT_CR:
            break;
          default:
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
          }
        }
        ptr += MINBPC(enc);
        /* in attribute value */
        for (;;) {
          int t;
          if (ptr == end)
            return XML_TOK_PARTIAL;
          t = BYTE_TYPE(enc, ptr);
          if (t == open)
            break;
          switch (t) {
          INVALID_CASES(ptr, nextTokPtr)
          case BT_AMP:
            {
              int tok = PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, &ptr);
              if (tok <= 0) {
                if (tok == XML_TOK_INVALID)
                  *nextTokPtr = ptr;
                return tok;
              }
              break;
            }
          case BT_LT:
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
          default:
            ptr += MINBPC(enc);
            break;
          }
        }
        ptr += MINBPC(enc);
        if (ptr == end)
          return XML_TOK_PARTIAL;
        switch (BYTE_TYPE(enc, ptr)) {
        case BT_S:
        case BT_CR:
        case BT_LF:
          break;
        case BT_SOL:
          goto sol;
        case BT_GT:
          goto gt;
        default:
          *nextTokPtr = ptr;
          return XML_TOK_INVALID;
        }
        /* ptr points to closing quote */
        for (;;) {
          ptr += MINBPC(enc);
          if (ptr == end)
            return XML_TOK_PARTIAL;
          switch (BYTE_TYPE(enc, ptr)) {
          CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
          case BT_S: case BT_CR: case BT_LF:
            continue;
          case BT_GT:
          gt:
            *nextTokPtr = ptr + MINBPC(enc);
            return XML_TOK_START_TAG_WITH_ATTS;
          case BT_SOL:
          sol:
            ptr += MINBPC(enc);
            if (ptr == end)
              return XML_TOK_PARTIAL;
            if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
              *nextTokPtr = ptr;
              return XML_TOK_INVALID;
            }
            *nextTokPtr = ptr + MINBPC(enc);
            return XML_TOK_EMPTY_ELEMENT_WITH_ATTS;
          default:
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
          }
          break;
        }
        break;
      }
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "<" */

static int
PREFIX(scanLt)(const ENCODING *enc, const char *ptr, const char *end,
               const char **nextTokPtr)
{
#ifdef XML_NS
  int hadColon;
#endif
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_EXCL:
    if ((ptr += MINBPC(enc)) == end)
      return XML_TOK_PARTIAL;
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_MINUS:
      return PREFIX(scanComment)(enc, ptr + MINBPC(enc), end, nextTokPtr);
    case BT_LSQB:
      return PREFIX(scanCdataSection)(enc, ptr + MINBPC(enc),
                                      end, nextTokPtr);
    }
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  case BT_QUEST:
    return PREFIX(scanPi)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_SOL:
    return PREFIX(scanEndTag)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
#ifdef XML_NS
  hadColon = 0;
#endif
  /* we have a start-tag */
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
#ifdef XML_NS
    case BT_COLON:
      if (hadColon) {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      hadColon = 1;
      ptr += MINBPC(enc);
      if (ptr == end)
        return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      default:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      break;
#endif
    case BT_S: case BT_CR: case BT_LF:
      {
        ptr += MINBPC(enc);
        while (ptr != end) {
          switch (BYTE_TYPE(enc, ptr)) {
          CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
          case BT_GT:
            goto gt;
          case BT_SOL:
            goto sol;
          case BT_S: case BT_CR: case BT_LF:
            ptr += MINBPC(enc);
            continue;
          default:
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
          }
          return PREFIX(scanAtts)(enc, ptr, end, nextTokPtr);
        }
        return XML_TOK_PARTIAL;
      }
    case BT_GT:
    gt:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_START_TAG_NO_ATTS;
    case BT_SOL:
    sol:
      ptr += MINBPC(enc);
      if (ptr == end)
        return XML_TOK_PARTIAL;
      if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_EMPTY_ELEMENT_NO_ATTS;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static int
PREFIX(contentTok)(const ENCODING *enc, const char *ptr, const char *end,
                   const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_NONE;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      if (n == 0)
        return XML_TOK_PARTIAL;
      end = ptr + n;
    }
  }
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_LT:
    return PREFIX(scanLt)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_AMP:
    return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_CR:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_TRAILING_CR;
    if (BYTE_TYPE(enc, ptr) == BT_LF)
      ptr += MINBPC(enc);
    *nextTokPtr = ptr;
    return XML_TOK_DATA_NEWLINE;
  case BT_LF:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_DATA_NEWLINE;
  case BT_RSQB:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_TRAILING_RSQB;
    if (!CHAR_MATCHES(enc, ptr, ASCII_RSQB))
      break;
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_TRAILING_RSQB;
    if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
      ptr -= MINBPC(enc);
      break;
    }
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  INVALID_CASES(ptr, nextTokPtr)
  default:
    ptr += MINBPC(enc);
    break;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      if (end - ptr < n || IS_INVALID_CHAR(enc, ptr, n)) { \
        *nextTokPtr = ptr; \
        return XML_TOK_DATA_CHARS; \
      } \
      ptr += n; \
      break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_RSQB:
      if (ptr + MINBPC(enc) != end) {
         if (!CHAR_MATCHES(enc, ptr + MINBPC(enc), ASCII_RSQB)) {
           ptr += MINBPC(enc);
           break;
         }
         if (ptr + 2*MINBPC(enc) != end) {
           if (!CHAR_MATCHES(enc, ptr + 2*MINBPC(enc), ASCII_GT)) {
             ptr += MINBPC(enc);
             break;
           }
           *nextTokPtr = ptr + 2*MINBPC(enc);
           return XML_TOK_INVALID;
         }
      }
      /* fall through */
    case BT_AMP:
    case BT_LT:
    case BT_NONXML:
    case BT_MALFORM:
    case BT_TRAIL:
    case BT_CR:
    case BT_LF:
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

/* ptr points to character following "%" */

static int
PREFIX(scanPercent)(const ENCODING *enc, const char *ptr, const char *end,
                    const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_S: case BT_LF: case BT_CR: case BT_PERCNT:
    *nextTokPtr = ptr;
    return XML_TOK_PERCENT;
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_SEMI:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_PARAM_ENTITY_REF;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static int
PREFIX(scanPoundName)(const ENCODING *enc, const char *ptr, const char *end,
                      const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_CR: case BT_LF: case BT_S:
    case BT_RPAR: case BT_GT: case BT_PERCNT: case BT_VERBAR:
      *nextTokPtr = ptr;
      return XML_TOK_POUND_NAME;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return -XML_TOK_POUND_NAME;
}

static int
PREFIX(scanLit)(int open, const ENCODING *enc,
                const char *ptr, const char *end,
                const char **nextTokPtr)
{
  while (ptr != end) {
    int t = BYTE_TYPE(enc, ptr);
    switch (t) {
    INVALID_CASES(ptr, nextTokPtr)
    case BT_QUOT:
    case BT_APOS:
      ptr += MINBPC(enc);
      if (t != open)
        break;
      if (ptr == end)
        return -XML_TOK_LITERAL;
      *nextTokPtr = ptr;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_S: case BT_CR: case BT_LF:
      case BT_GT: case BT_PERCNT: case BT_LSQB:
        return XML_TOK_LITERAL;
      default:
        return XML_TOK_INVALID;
      }
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  return XML_TOK_PARTIAL;
}

static int
PREFIX(prologTok)(const ENCODING *enc, const char *ptr, const char *end,
                  const char **nextTokPtr)
{
  int tok;
  if (ptr == end)
    return XML_TOK_NONE;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      if (n == 0)
        return XML_TOK_PARTIAL;
      end = ptr + n;
    }
  }
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_QUOT:
    return PREFIX(scanLit)(BT_QUOT, enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_APOS:
    return PREFIX(scanLit)(BT_APOS, enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_LT:
    {
      ptr += MINBPC(enc);
      if (ptr == end)
        return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_EXCL:
        return PREFIX(scanDecl)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      case BT_QUEST:
        return PREFIX(scanPi)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      case BT_NMSTRT:
      case BT_HEX:
      case BT_NONASCII:
      case BT_LEAD2:
      case BT_LEAD3:
      case BT_LEAD4:
        *nextTokPtr = ptr - MINBPC(enc);
        return XML_TOK_INSTANCE_START;
      }
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  case BT_CR:
    if (ptr + MINBPC(enc) == end) {
      *nextTokPtr = end;
      return -XML_TOK_PROLOG_S;
    }
    /* fall through */
  case BT_S: case BT_LF:
    for (;;) {
      ptr += MINBPC(enc);
      if (ptr == end)
        break;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_S: case BT_LF:
        break;
      case BT_CR:
        /* don't split CR/LF pair */
        if (ptr + MINBPC(enc) != end)
          break;
        /* fall through */
      default:
        *nextTokPtr = ptr;
        return XML_TOK_PROLOG_S;
      }
    }
    *nextTokPtr = ptr;
    return XML_TOK_PROLOG_S;
  case BT_PERCNT:
    return PREFIX(scanPercent)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_COMMA:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_COMMA;
  case BT_LSQB:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OPEN_BRACKET;
  case BT_RSQB:
    ptr += MINBPC(enc);
    if (ptr == end)
      return -XML_TOK_CLOSE_BRACKET;
    if (CHAR_MATCHES(enc, ptr, ASCII_RSQB)) {
      if (ptr + MINBPC(enc) == end)
        return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr + MINBPC(enc), ASCII_GT)) {
        *nextTokPtr = ptr + 2*MINBPC(enc);
        return XML_TOK_COND_SECT_CLOSE;
      }
    }
    *nextTokPtr = ptr;
    return XML_TOK_CLOSE_BRACKET;
  case BT_LPAR:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OPEN_PAREN;
  case BT_RPAR:
    ptr += MINBPC(enc);
    if (ptr == end)
      return -XML_TOK_CLOSE_PAREN;
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_AST:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_ASTERISK;
    case BT_QUEST:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_QUESTION;
    case BT_PLUS:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_PLUS;
    case BT_CR: case BT_LF: case BT_S:
    case BT_GT: case BT_COMMA: case BT_VERBAR:
    case BT_RPAR:
      *nextTokPtr = ptr;
      return XML_TOK_CLOSE_PAREN;
    }
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  case BT_VERBAR:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OR;
  case BT_GT:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_DECL_CLOSE;
  case BT_NUM:
    return PREFIX(scanPoundName)(enc, ptr + MINBPC(enc), end, nextTokPtr);
#define LEAD_CASE(n) \
  case BT_LEAD ## n: \
    if (end - ptr < n) \
      return XML_TOK_PARTIAL_CHAR; \
    if (IS_NMSTRT_CHAR(enc, ptr, n)) { \
      ptr += n; \
      tok = XML_TOK_NAME; \
      break; \
    } \
    if (IS_NAME_CHAR(enc, ptr, n)) { \
      ptr += n; \
      tok = XML_TOK_NMTOKEN; \
      break; \
    } \
    *nextTokPtr = ptr; \
    return XML_TOK_INVALID;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
  case BT_NMSTRT:
  case BT_HEX:
    tok = XML_TOK_NAME;
    ptr += MINBPC(enc);
    break;
  case BT_DIGIT:
  case BT_NAME:
  case BT_MINUS:
#ifdef XML_NS
  case BT_COLON:
#endif
    tok = XML_TOK_NMTOKEN;
    ptr += MINBPC(enc);
    break;
  case BT_NONASCII:
    if (IS_NMSTRT_CHAR_MINBPC(enc, ptr)) {
      ptr += MINBPC(enc);
      tok = XML_TOK_NAME;
      break;
    }
    if (IS_NAME_CHAR_MINBPC(enc, ptr)) {
      ptr += MINBPC(enc);
      tok = XML_TOK_NMTOKEN;
      break;
    }
    /* fall through */
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_GT: case BT_RPAR: case BT_COMMA:
    case BT_VERBAR: case BT_LSQB: case BT_PERCNT:
    case BT_S: case BT_CR: case BT_LF:
      *nextTokPtr = ptr;
      return tok;
#ifdef XML_NS
    case BT_COLON:
      ptr += MINBPC(enc);
      switch (tok) {
      case XML_TOK_NAME:
        if (ptr == end)
          return XML_TOK_PARTIAL;
        tok = XML_TOK_PREFIXED_NAME;
        switch (BYTE_TYPE(enc, ptr)) {
        CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
        default:
          tok = XML_TOK_NMTOKEN;
          break;
        }
        break;
      case XML_TOK_PREFIXED_NAME:
        tok = XML_TOK_NMTOKEN;
        break;
      }
      break;
#endif
    case BT_PLUS:
      if (tok == XML_TOK_NMTOKEN)  {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_PLUS;
    case BT_AST:
      if (tok == XML_TOK_NMTOKEN)  {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_ASTERISK;
    case BT_QUEST:
      if (tok == XML_TOK_NMTOKEN)  {
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_QUESTION;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return -tok;
}

static int
PREFIX(attributeValueTok)(const ENCODING *enc, const char *ptr,
                          const char *end, const char **nextTokPtr)
{
  const char *start;
  if (ptr == end)
    return XML_TOK_NONE;
  start = ptr;
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: ptr += n; break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_AMP:
      if (ptr == start)
        return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_LT:
      /* this is for inside entity references */
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    case BT_LF:
      if (ptr == start) {
        *nextTokPtr = ptr + MINBPC(enc);
        return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_CR:
      if (ptr == start) {
        ptr += MINBPC(enc);
        if (ptr == end)
          return XML_TOK_TRAILING_CR;
        if (BYTE_TYPE(enc, ptr) == BT_LF)
          ptr += MINBPC(enc);
        *nextTokPtr = ptr;
        return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_S:
      if (ptr == start) {
        *nextTokPtr = ptr + MINBPC(enc);
        return XML_TOK_ATTRIBUTE_VALUE_S;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

static int
PREFIX(entityValueTok)(const ENCODING *enc, const char *ptr,
                       const char *end, const char **nextTokPtr)
{
  const char *start;
  if (ptr == end)
    return XML_TOK_NONE;
  start = ptr;
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: ptr += n; break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_AMP:
      if (ptr == start)
        return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_PERCNT:
      if (ptr == start) {
        int tok =  PREFIX(scanPercent)(enc, ptr + MINBPC(enc),
                                       end, nextTokPtr);
        return (tok == XML_TOK_PERCENT) ? XML_TOK_INVALID : tok;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_LF:
      if (ptr == start) {
        *nextTokPtr = ptr + MINBPC(enc);
        return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_CR:
      if (ptr == start) {
        ptr += MINBPC(enc);
        if (ptr == end)
          return XML_TOK_TRAILING_CR;
        if (BYTE_TYPE(enc, ptr) == BT_LF)
          ptr += MINBPC(enc);
        *nextTokPtr = ptr;
        return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

#ifdef XML_DTD

static int
PREFIX(ignoreSectionTok)(const ENCODING *enc, const char *ptr,
                         const char *end, const char **nextTokPtr)
{
  int level = 0;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      end = ptr + n;
    }
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    INVALID_CASES(ptr, nextTokPtr)
    case BT_LT:
      if ((ptr += MINBPC(enc)) == end)
        return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_EXCL)) {
        if ((ptr += MINBPC(enc)) == end)
          return XML_TOK_PARTIAL;
        if (CHAR_MATCHES(enc, ptr, ASCII_LSQB)) {
          ++level;
          ptr += MINBPC(enc);
        }
      }
      break;
    case BT_RSQB:
      if ((ptr += MINBPC(enc)) == end)
        return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_RSQB)) {
        if ((ptr += MINBPC(enc)) == end)
          return XML_TOK_PARTIAL;
        if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
          ptr += MINBPC(enc);
          if (level == 0) {
            *nextTokPtr = ptr;
            return XML_TOK_IGNORE_SECT;
          }
          --level;
        }
      }
      break;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  return XML_TOK_PARTIAL;
}

#endif /* XML_DTD */

static int
PREFIX(isPublicId)(const ENCODING *enc, const char *ptr, const char *end,
                   const char **badPtr)
{
  ptr += MINBPC(enc);
  end -= MINBPC(enc);
  for (; ptr != end; ptr += MINBPC(enc)) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
    case BT_HEX:
    case BT_MINUS:
    case BT_APOS:
    case BT_LPAR:
    case BT_RPAR:
    case BT_PLUS:
    case BT_COMMA:
    case BT_SOL:
    case BT_EQUALS:
    case BT_QUEST:
    case BT_CR:
    case BT_LF:
    case BT_SEMI:
    case BT_EXCL:
    case BT_AST:
    case BT_PERCNT:
    case BT_NUM:
#ifdef XML_NS
    case BT_COLON:
#endif
      break;
    case BT_S:
      if (CHAR_MATCHES(enc, ptr, ASCII_TAB)) {
        *badPtr = ptr;
        return 0;
      }
      break;
    case BT_NAME:
    case BT_NMSTRT:
      if (!(BYTE_TO_ASCII(enc, ptr) & ~0x7f))
        break;
    default:
      switch (BYTE_TO_ASCII(enc, ptr)) {
      case 0x24: /* $ */
      case 0x40: /* @ */
        break;
      default:
        *badPtr = ptr;
        return 0;
      }
      break;
    }
  }
  return 1;
}

/* This must only be called for a well-formed start-tag or empty
   element tag.  Returns the number of attributes.  Pointers to the
   first attsMax attributes are stored in atts.
*/

static int
PREFIX(getAtts)(const ENCODING *enc, const char *ptr,
                int attsMax, ATTRIBUTE *atts)
{
  enum { other, inName, inValue } state = inName;
  int nAtts = 0;
  int open = 0; /* defined when state == inValue;
                   initialization just to shut up compilers */

  for (ptr += MINBPC(enc);; ptr += MINBPC(enc)) {
    switch (BYTE_TYPE(enc, ptr)) {
#define START_NAME \
      if (state == other) { \
        if (nAtts < attsMax) { \
          atts[nAtts].name = ptr; \
          atts[nAtts].normalized = 1; \
        } \
        state = inName; \
      }
#define LEAD_CASE(n) \
    case BT_LEAD ## n: START_NAME ptr += (n - MINBPC(enc)); break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_NONASCII:
    case BT_NMSTRT:
    case BT_HEX:
      START_NAME
      break;
#undef START_NAME
    case BT_QUOT:
      if (state != inValue) {
        if (nAtts < attsMax)
          atts[nAtts].valuePtr = ptr + MINBPC(enc);
        state = inValue;
        open = BT_QUOT;
      }
      else if (open == BT_QUOT) {
        state = other;
        if (nAtts < attsMax)
          atts[nAtts].valueEnd = ptr;
        nAtts++;
      }
      break;
    case BT_APOS:
      if (state != inValue) {
        if (nAtts < attsMax)
          atts[nAtts].valuePtr = ptr + MINBPC(enc);
        state = inValue;
        open = BT_APOS;
      }
      else if (open == BT_APOS) {
        state = other;
        if (nAtts < attsMax)
          atts[nAtts].valueEnd = ptr;
        nAtts++;
      }
      break;
    case BT_AMP:
      if (nAtts < attsMax)
        atts[nAtts].normalized = 0;
      break;
    case BT_S:
      if (state == inName)
        state = other;
      else if (state == inValue
               && nAtts < attsMax
               && atts[nAtts].normalized
               && (ptr == atts[nAtts].valuePtr
                   || BYTE_TO_ASCII(enc, ptr) != ASCII_SPACE
                   || BYTE_TO_ASCII(enc, ptr + MINBPC(enc)) == ASCII_SPACE
                   || BYTE_TYPE(enc, ptr + MINBPC(enc)) == open))
        atts[nAtts].normalized = 0;
      break;
    case BT_CR: case BT_LF:
      /* This case ensures that the first attribute name is counted
         Apart from that we could just change state on the quote. */
      if (state == inName)
        state = other;
      else if (state == inValue && nAtts < attsMax)
        atts[nAtts].normalized = 0;
      break;
    case BT_GT:
    case BT_SOL:
      if (state != inValue)
        return nAtts;
      break;
    default:
      break;
    }
  }
  /* not reached */
}

static int
PREFIX(charRefNumber)(const ENCODING *enc, const char *ptr)
{
  int result = 0;
  /* skip &# */
  ptr += 2*MINBPC(enc);
  if (CHAR_MATCHES(enc, ptr, ASCII_x)) {
    for (ptr += MINBPC(enc);
         !CHAR_MATCHES(enc, ptr, ASCII_SEMI);
         ptr += MINBPC(enc)) {
      int c = BYTE_TO_ASCII(enc, ptr);
      switch (c) {
      case ASCII_0: case ASCII_1: case ASCII_2: case ASCII_3: case ASCII_4:
      case ASCII_5: case ASCII_6: case ASCII_7: case ASCII_8: case ASCII_9:
        result <<= 4;
        result |= (c - ASCII_0);
        break;
      case ASCII_A: case ASCII_B: case ASCII_C:
      case ASCII_D: case ASCII_E: case ASCII_F:
        result <<= 4;
        result += 10 + (c - ASCII_A);
        break;
      case ASCII_a: case ASCII_b: case ASCII_c:
      case ASCII_d: case ASCII_e: case ASCII_f:
        result <<= 4;
        result += 10 + (c - ASCII_a);
        break;
      }
      if (result >= 0x110000)
        return -1;
    }
  }
  else {
    for (; !CHAR_MATCHES(enc, ptr, ASCII_SEMI); ptr += MINBPC(enc)) {
      int c = BYTE_TO_ASCII(enc, ptr);
      result *= 10;
      result += (c - ASCII_0);
      if (result >= 0x110000)
        return -1;
    }
  }
  return checkCharRefNumber(result);
}

static int
PREFIX(predefinedEntityName)(const ENCODING *enc, const char *ptr,
                             const char *end)
{
  switch ((end - ptr)/MINBPC(enc)) {
  case 2:
    if (CHAR_MATCHES(enc, ptr + MINBPC(enc), ASCII_t)) {
      switch (BYTE_TO_ASCII(enc, ptr)) {
      case ASCII_l:
        return ASCII_LT;
      case ASCII_g:
        return ASCII_GT;
      }
    }
    break;
  case 3:
    if (CHAR_MATCHES(enc, ptr, ASCII_a)) {
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_m)) {
        ptr += MINBPC(enc);
        if (CHAR_MATCHES(enc, ptr, ASCII_p))
          return ASCII_AMP;
      }
    }
    break;
  case 4:
    switch (BYTE_TO_ASCII(enc, ptr)) {
    case ASCII_q:
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_u)) {
        ptr += MINBPC(enc);
        if (CHAR_MATCHES(enc, ptr, ASCII_o)) {
          ptr += MINBPC(enc);
          if (CHAR_MATCHES(enc, ptr, ASCII_t))
            return ASCII_QUOT;
        }
      }
      break;
    case ASCII_a:
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_p)) {
        ptr += MINBPC(enc);
        if (CHAR_MATCHES(enc, ptr, ASCII_o)) {
          ptr += MINBPC(enc);
          if (CHAR_MATCHES(enc, ptr, ASCII_s))
            return ASCII_APOS;
        }
      }
      break;
    }
  }
  return 0;
}

static int
PREFIX(sameName)(const ENCODING *enc, const char *ptr1, const char *ptr2)
{
  for (;;) {
    switch (BYTE_TYPE(enc, ptr1)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      if (*ptr1++ != *ptr2++) \
        return 0;
    LEAD_CASE(4) LEAD_CASE(3) LEAD_CASE(2)
#undef LEAD_CASE
      /* fall through */
      if (*ptr1++ != *ptr2++)
        return 0;
      break;
    case BT_NONASCII:
    case BT_NMSTRT:
#ifdef XML_NS
    case BT_COLON:
#endif
    case BT_HEX:
    case BT_DIGIT:
    case BT_NAME:
    case BT_MINUS:
      if (*ptr2++ != *ptr1++)
        return 0;
      if (MINBPC(enc) > 1) {
        if (*ptr2++ != *ptr1++)
          return 0;
        if (MINBPC(enc) > 2) {
          if (*ptr2++ != *ptr1++)
            return 0;
          if (MINBPC(enc) > 3) {
            if (*ptr2++ != *ptr1++)
              return 0;
          }
        }
      }
      break;
    default:
      if (MINBPC(enc) == 1 && *ptr1 == *ptr2)
        return 1;
      switch (BYTE_TYPE(enc, ptr2)) {
      case BT_LEAD2:
      case BT_LEAD3:
      case BT_LEAD4:
      case BT_NONASCII:
      case BT_NMSTRT:
#ifdef XML_NS
      case BT_COLON:
#endif
      case BT_HEX:
      case BT_DIGIT:
      case BT_NAME:
      case BT_MINUS:
        return 0;
      default:
        return 1;
      }
    }
  }
  /* not reached */
}

static int
PREFIX(nameMatchesAscii)(const ENCODING *enc, const char *ptr1,
                         const char *end1, const char *ptr2)
{
  for (; *ptr2; ptr1 += MINBPC(enc), ptr2++) {
    if (ptr1 == end1)
      return 0;
    if (!CHAR_MATCHES(enc, ptr1, *ptr2))
      return 0;
  }
  return ptr1 == end1;
}

static int
PREFIX(nameLength)(const ENCODING *enc, const char *ptr)
{
  const char *start = ptr;
  for (;;) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: ptr += n; break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_NONASCII:
    case BT_NMSTRT:
#ifdef XML_NS
    case BT_COLON:
#endif
    case BT_HEX:
    case BT_DIGIT:
    case BT_NAME:
    case BT_MINUS:
      ptr += MINBPC(enc);
      break;
    default:
      return ptr - start;
    }
  }
}

static const char *
PREFIX(skipS)(const ENCODING *enc, const char *ptr)
{
  for (;;) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_LF:
    case BT_CR:
    case BT_S:
      ptr += MINBPC(enc);
      break;
    default:
      return ptr;
    }
  }
}

static void
PREFIX(updatePosition)(const ENCODING *enc,
                       const char *ptr,
                       const char *end,
                       POSITION *pos)
{
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      ptr += n; \
      break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_LF:
      pos->columnNumber = (unsigned)-1;
      pos->lineNumber++;
      ptr += MINBPC(enc);
      break;
    case BT_CR:
      pos->lineNumber++;
      ptr += MINBPC(enc);
      if (ptr != end && BYTE_TYPE(enc, ptr) == BT_LF)
        ptr += MINBPC(enc);
      pos->columnNumber = (unsigned)-1;
      break;
    default:
      ptr += MINBPC(enc);
      break;
    }
    pos->columnNumber++;
  }
}

#undef DO_LEAD_CASE
#undef MULTIBYTE_CASES
#undef INVALID_CASES
#undef CHECK_NAME_CASE
#undef CHECK_NAME_CASES
#undef CHECK_NMSTRT_CASE
#undef CHECK_NMSTRT_CASES