bdflib.c

奇趣公司比较新的qt/emd版本

                   unsigned long  n )
  {
    unsigned long  i, u;


    if ( list == 0 || list->used == 0 || n == 0 )
      return;

    if ( n >= list->used )
    {
      list->used = 0;
      return;
    }

    for ( u = n, i = 0; u < list->used; i++, u++ )
      list->field[i] = list->field[u];
    list->used -= n;
  }


  static char *
  _bdf_list_join( _bdf_list_t*    list,
                  int             c,
                  unsigned long  *alen )
  {
    unsigned long  i, j;
    char           *fp, *dp;


    *alen = 0;

    if ( list == 0 || list->used == 0 )
      return 0;

    dp = list->field[0];
    for ( i = j = 0; i < list->used; i++ )
    {
      fp = list->field[i];
      while ( *fp )
        dp[j++] = *fp++;

      if ( i + 1 < list->used )
        dp[j++] = (char)c;
    }
    dp[j] = 0;

    *alen = j;
    return dp;
  }


  /* An empty string for empty fields. */

  static const char  empty[1] = { 0 };      /* XXX eliminate this */


  static FT_Error
  _bdf_list_split( _bdf_list_t*   list,
                   char*          separators,
                   char*          line,
                   unsigned long  linelen )
  {
    int       mult, final_empty;
    char      *sp, *ep, *end;
    char      seps[32];
    FT_Error  error = BDF_Err_Ok;


    /* Initialize the list. */
    list->used = 0;

    /* If the line is empty, then simply return. */
    if ( linelen == 0 || line[0] == 0 )
      goto Exit;

    /* In the original code, if the `separators' parameter is NULL or */
    /* empty, the list is split into individual bytes.  We don't need */
    /* this, so an error is signaled.                                 */
    if ( separators == 0 || *separators == 0 )
    {
      error = BDF_Err_Invalid_Argument;
      goto Exit;
    }

    /* Prepare the separator bitmap. */
    FT_MEM_ZERO( seps, 32 );

    /* If the very last character of the separator string is a plus, then */
    /* set the `mult' flag to indicate that multiple separators should be */
    /* collapsed into one.                                                */
    for ( mult = 0, sp = separators; sp && *sp; sp++ )
    {
      if ( *sp == '+' && *( sp + 1 ) == 0 )
        mult = 1;
      else
        setsbit( seps, *sp );
    }

    /* Break the line up into fields. */
    for ( final_empty = 0, sp = ep = line, end = sp + linelen;
          sp < end && *sp; )
    {
      /* Collect everything that is not a separator. */
      for ( ; *ep && !sbitset( seps, *ep ); ep++ )
        ;

      /* Resize the list if necessary. */
      if ( list->used == list->size )
      {
        error = _bdf_list_ensure( list, list->used + 1 );
        if ( error )
          goto Exit;
      }

      /* Assign the field appropriately. */
      list->field[list->used++] = ( ep > sp ) ? sp : (char*)empty;

      sp = ep;

      if ( mult )
      {
        /* If multiple separators should be collapsed, do it now by */
        /* setting all the separator characters to 0.               */
        for ( ; *ep && sbitset( seps, *ep ); ep++ )
          *ep = 0;
      }
      else if ( *ep != 0 )
        /* Don't collapse multiple separators by making them 0, so just */
        /* make the one encountered 0.                                  */
        *ep++ = 0;

      final_empty = ( ep > sp && *ep == 0 );
      sp = ep;
    }

    /* Finally, NULL-terminate the list. */
    if ( list->used + final_empty >= list->size )
    {
      error = _bdf_list_ensure( list, list->used + final_empty + 1 );
      if ( error )
        goto Exit;
    }

    if ( final_empty )
      list->field[list->used++] = (char*)empty;

    list->field[list->used] = 0;

  Exit:
    return error;
  }


#define NO_SKIP  256  /* this value cannot be stored in a 'char' */


  static FT_Error
  _bdf_readstream( FT_Stream         stream,
                   _bdf_line_func_t  callback,
                   void*             client_data,
                   unsigned long    *lno )
  {
    _bdf_line_func_t  cb;
    unsigned long     lineno, buf_size;
    int               refill, bytes, hold, to_skip;
    int               start, end, cursor, avail;
    char*             buf = 0;
    FT_Memory         memory = stream->memory;
    FT_Error          error = BDF_Err_Ok;


    if ( callback == 0 )
    {
      error = BDF_Err_Invalid_Argument;
      goto Exit;
    }

    /* initial size and allocation of the input buffer */
    buf_size = 1024;

    if ( FT_NEW_ARRAY( buf, buf_size ) )
      goto Exit;

    cb      = callback;
    lineno  = 1;
    buf[0]  = 0;
    start   = 0;
    end     = 0;
    avail   = 0;
    cursor  = 0;
    refill  = 1;
    to_skip = NO_SKIP;
    bytes   = 0;        /* make compiler happy */

    for (;;)
    {
      if ( refill )
      {
        bytes  = (int)FT_Stream_TryRead( stream, (FT_Byte*)buf + cursor,
                                         (FT_ULong)(buf_size - cursor) );
        avail  = cursor + bytes;
        cursor = 0;
        refill = 0;
      }

      end = start;

      /* should we skip an optional character like \n or \r? */
      if ( start < avail && buf[start] == to_skip )
      {
        start  += 1;
        to_skip = NO_SKIP;
        continue;
      }

      /* try to find the end of the line */
      while ( end < avail && buf[end] != '\n' && buf[end] != '\r' )
        end++;

      /* if we hit the end of the buffer, try shifting its content */
      /* or even resizing it                                       */
      if ( end >= avail )
      {
        if ( bytes == 0 )  /* last line in file doesn't end in \r or \n */
          break;           /* ignore it then exit                       */

        if ( start == 0 )
        {
          /* this line is definitely too long; try resizing the input */
          /* buffer a bit to handle it.                               */
          FT_ULong  new_size;


          if ( buf_size >= 65536UL )  /* limit ourselves to 64KByte */
          {
            error = BDF_Err_Invalid_Argument;
            goto Exit;
          }

          new_size = buf_size * 2;
          if ( FT_RENEW_ARRAY( buf, buf_size, new_size ) )
            goto Exit;

          cursor   = buf_size;
          buf_size = new_size;
        }
        else
        {
          bytes = avail - start;

          FT_MEM_COPY( buf, buf + start, bytes );

          cursor = bytes;
          avail -= bytes;
          start  = 0;
        }
        refill = 1;
        continue;
      }

      /* Temporarily NUL-terminate the line. */
      hold     = buf[end];
      buf[end] = 0;

      /* XXX: Use encoding independent value for 0x1a */
      if ( buf[start] != '#' && buf[start] != 0x1a && end > start )
      {
        error = (*cb)( buf + start, end - start, lineno,
                       (void*)&cb, client_data );
        if ( error )
          break;
      }

      lineno  += 1;
      buf[end] = (char)hold;
      start    = end + 1;

      if ( hold == '\n' )
        to_skip = '\r';
      else if ( hold == '\r' )
        to_skip = '\n';
      else
        to_skip = NO_SKIP;
    }

    *lno = lineno;

  Exit:
    FT_FREE( buf );
    return error;
  }


  /* XXX: make this work with EBCDIC also */

  static const unsigned char  a2i[128] =
  {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };

  static const unsigned char  odigits[32] =
  {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  };

  static const unsigned char  ddigits[32] =
  {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x03,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  };

  static const unsigned char  hdigits[32] =
  {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x03,
    0x7e, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  };


#define isdigok( m, d )  (m[(d) >> 3] & ( 1 << ( (d) & 7 ) ) )


  /* Routine to convert an ASCII string into an unsigned long integer. */
  static unsigned long
  _bdf_atoul( char*   s,
              char**  end,
              int     base )
  {
    unsigned long         v;
    const unsigned char*  dmap;


    if ( s == 0 || *s == 0 )
      return 0;

    /* Make sure the radix is something recognizable.  Default to 10. */
    switch ( base )
    {
    case 8:
      dmap = odigits;
      break;
    case 16:
      dmap = hdigits;
      break;
    default:
      base = 10;
      dmap = ddigits;
      break;
    }

    /* Check for the special hex prefix. */
    if ( *s == '0'                                  &&
         ( *( s + 1 ) == 'x' || *( s + 1 ) == 'X' ) )
    {
      base = 16;
      dmap = hdigits;
      s   += 2;
    }

    for ( v = 0; isdigok( dmap, *s ); s++ )
      v = v * base + a2i[(int)*s];

    if ( end != 0 )
      *end = s;

    return v;
  }


  /* Routine to convert an ASCII string into an signed long integer. */
  static long
  _bdf_atol( char*   s,
             char**  end,
             int     base )
  {
    long                  v, neg;
    const unsigned char*  dmap;


    if ( s == 0 || *s == 0 )
      return 0;

    /* Make sure the radix is something recognizable.  Default to 10. */
    switch ( base )
    {
    case 8:
      dmap = odigits;
      break;
    case 16:
      dmap = hdigits;
      break;
    default:
      base = 10;
      dmap = ddigits;
      break;
    }

    /* Check for a minus sign. */
    neg = 0;
    if ( *s == '-' )
    {
      s++;
      neg = 1;
    }

    /* Check for the special hex prefix. */
    if ( *s == '0'                                  &&
         ( *( s + 1 ) == 'x' || *( s + 1 ) == 'X' ) )
    {
      base = 16;
      dmap = hdigits;
      s   += 2;
    }

    for ( v = 0; isdigok( dmap, *s ); s++ )
      v = v * base + a2i[(int)*s];

    if ( end != 0 )
      *end = s;

    return ( !neg ) ? v : -v;
  }


  /* Routine to convert an ASCII string into an signed short integer. */
  static short
  _bdf_atos( char*   s,
             char**  end,
             int     base )
  {
    short                 v, neg;
    const unsigned char*  dmap;


    if ( s == 0 || *s == 0 )
      return 0;