psobjs.c

下载来的一个看图软件的源代码

    FT_Long   result = 0;
    FT_Byte*  cur    = *cursor;
    FT_Byte   c      = '\0', d;


    for ( ; cur < limit; cur++ )
    {
      c = *cur;
      d = (FT_Byte)( c - '0' );
      if ( d < 10 )
        break;

      if ( c == '-' )
      {
        cur++;
        break;
      }
    }

    if ( cur < limit )
    {
      do
      {
        d = (FT_Byte)( cur[0] - '0' );
        if ( d >= 10 )
        {
          if ( cur[0] == '#' )
          {
            cur++;
            result = T1Radix( result, &cur, limit );
          }
          break;
        }

        result = result * 10 + d;
        cur++;

      } while ( cur < limit );

      if ( c == '-' )
        result = -result;
    }

    *cursor = cur;
    return result;
  }


  /* <...>: hexadecimal string */
  static FT_Error
  ps_tobytes( FT_Byte**  cursor,
              FT_Byte*   limit,
              FT_Int     max_bytes,
              FT_Byte*   bytes,
              FT_Int*    pnum_bytes )
  {
    FT_Error  error = PSaux_Err_Ok;

    FT_Byte*  cur = *cursor;
    FT_Int    n   = 0;
    FT_Byte   b;


    skip_spaces( &cur, limit );

    if ( *cur != '<' )
    {
      error = PSaux_Err_Invalid_File_Format;
      goto Exit;
    }

    cur++;

    for ( ; cur < limit; n++ )
    {
      FT_Byte*  cur2 = cur;


      if ( n + 1 > max_bytes * 2 )
        goto Exit;

      /* All white-space charcters are ignored. */
      skip_spaces( &cur, limit );

      b = T1Radix( 16, &cur, cur + 1 );

      if ( cur == cur2 )
        break;

      /* <f> == <f0> != <0f> */
      bytes[n / 2] = ( n % 2 ) ? bytes[n / 2] + b
                               : b * 16;
    }

    skip_spaces( &cur, limit );

    if ( *cur != '>' )
    {
      error = PSaux_Err_Invalid_File_Format;
      goto Exit;
    }

    *cursor = ++cur;

  Exit:
    *pnum_bytes = ( n + 1 ) / 2;

    return error;
  }


  static FT_Long
  t1_tofixed( FT_Byte**  cursor,
              FT_Byte*   limit,
              FT_Long    power_ten )
  {
    FT_Byte*  cur  = *cursor;
    FT_Long   num, divider, result;
    FT_Int    sign = 0;
    FT_Byte   d;


    if ( cur >= limit )
      return 0;

    /* first of all, check the sign */
    if ( *cur == '-' )
    {
      sign = 1;
      cur++;
    }

    /* then, read the integer part, if any */
    if ( *cur != '.' )
      result = t1_toint( &cur, limit ) << 16;
    else
      result = 0;

    num     = 0;
    divider = 1;

    if ( cur >= limit )
      goto Exit;

    /* read decimal part, if any */
    if ( *cur == '.' && cur + 1 < limit )
    {
      cur++;

      for (;;)
      {
        d = (FT_Byte)( *cur - '0' );
        if ( d >= 10 )
          break;

        if ( divider < 10000000L )
        {
          num      = num * 10 + d;
          divider *= 10;
        }

        cur++;
        if ( cur >= limit )
          break;
      }
    }

    /* read exponent, if any */
    if ( cur + 1 < limit && ( *cur == 'e' || *cur == 'E' ) )
    {
      cur++;
      power_ten += t1_toint( &cur, limit );
    }

  Exit:
    /* raise to power of ten if needed */
    while ( power_ten > 0 )
    {
      result = result * 10;
      num    = num * 10;
      power_ten--;
    }

    while ( power_ten < 0 )
    {
      result  = result / 10;
      divider = divider * 10;
      power_ten++;
    }

    if ( num )
      result += FT_DivFix( num, divider );

    if ( sign )
      result = -result;

    *cursor = cur;
    return result;
  }


  static FT_Int
  t1_tocoordarray( FT_Byte**  cursor,
                   FT_Byte*   limit,
                   FT_Int     max_coords,
                   FT_Short*  coords )
  {
    FT_Byte*  cur   = *cursor;
    FT_Int    count = 0;
    FT_Byte   c, ender;


    if ( cur >= limit )
      goto Exit;

    /* check for the beginning of an array; if not, only one number will */
    /* be read                                                           */
    c     = *cur;
    ender = 0;

    if ( c == '[' )
      ender = ']';

    if ( c == '{' )
      ender = '}';

    if ( ender )
      cur++;

    /* now, read the coordinates */
    for ( ; cur < limit; )
    {
      /* skip whitespace in front of data */
      for (;;)
      {
        c = *cur;
        if ( c != ' ' && c != '\t' )
          break;

        cur++;
        if ( cur >= limit )
          goto Exit;
      }

      if ( count >= max_coords || c == ender )
        break;

      coords[count] = (FT_Short)( t1_tofixed( &cur, limit, 0 ) >> 16 );
      count++;

      if ( !ender )
        break;
    }

  Exit:
    *cursor = cur;
    return count;
  }


  static FT_Int
  t1_tofixedarray( FT_Byte**  cursor,
                   FT_Byte*   limit,
                   FT_Int     max_values,
                   FT_Fixed*  values,
                   FT_Int     power_ten )
  {
    FT_Byte*  cur   = *cursor;
    FT_Int    count = 0;
    FT_Byte   c, ender;


    if ( cur >= limit ) goto Exit;

    /* check for the beginning of an array. If not, only one number will */
    /* be read                                                           */
    c     = *cur;
    ender = 0;

    if ( c == '[' )
      ender = ']';

    if ( c == '{' )
      ender = '}';

    if ( ender )
      cur++;

    /* now, read the values */
    for ( ; cur < limit; )
    {
      /* skip whitespace in front of data */
      for (;;)
      {
        c = *cur;
        if ( c != ' ' && c != '\t' )
          break;

        cur++;
        if ( cur >= limit )
          goto Exit;
      }

      if ( count >= max_values || c == ender )
        break;

      values[count] = t1_tofixed( &cur, limit, power_ten );
      count++;

      if ( !ender )
        break;
    }

  Exit:
    *cursor = cur;
    return count;
  }


#if 0

  static FT_String*
  t1_tostring( FT_Byte**  cursor,
               FT_Byte*   limit,
               FT_Memory  memory )
  {
    FT_Byte*    cur = *cursor;
    FT_PtrDist  len = 0;
    FT_Int      count;
    FT_String*  result;
    FT_Error    error;


    /* XXX: some stupid fonts have a `Notice' or `Copyright' string     */
    /*      that simply doesn't begin with an opening parenthesis, even */
    /*      though they have a closing one!  E.g. "amuncial.pfb"        */
    /*                                                                  */
    /*      We must deal with these ill-fated cases there.  Note that   */
    /*      these fonts didn't work with the old Type 1 driver as the   */
    /*      notice/copyright was not recognized as a valid string token */
    /*      and made the old token parser commit errors.                */

    while ( cur < limit && ( *cur == ' ' || *cur == '\t' ) )
      cur++;
    if ( cur + 1 >= limit )
      return 0;

    if ( *cur == '(' )
      cur++;  /* skip the opening parenthesis, if there is one */

    *cursor = cur;
    count   = 0;

    /* then, count its length */
    for ( ; cur < limit; cur++ )
    {
      if ( *cur == '(' )
        count++;

      else if ( *cur == ')' )
      {
        count--;
        if ( count < 0 )
          break;
      }
    }

    len = cur - *cursor;
    if ( cur >= limit || FT_ALLOC( result, len + 1 ) )
      return 0;

    /* now copy the string */
    FT_MEM_COPY( result, *cursor, len );
    result[len] = '\0';
    *cursor = cur;
    return result;
  }

#endif /* 0 */


  static int
  t1_tobool( FT_Byte**  cursor,
             FT_Byte*   limit )
  {
    FT_Byte*  cur    = *cursor;
    FT_Bool   result = 0;


    /* return 1 if we find `true', 0 otherwise */
    if ( cur + 3 < limit &&
         cur[0] == 't' &&
         cur[1] == 'r' &&
         cur[2] == 'u' &&
         cur[3] == 'e' )
    {
      result = 1;
      cur   += 5;
    }
    else if ( cur + 4 < limit &&
              cur[0] == 'f' &&
              cur[1] == 'a' &&
              cur[2] == 'l' &&
              cur[3] == 's' &&
              cur[4] == 'e' )
    {
      result = 0;
      cur   += 6;
    }

    *cursor = cur;
    return result;
  }


  /* Load a simple field (i.e. non-table) into the current list of objects */
  FT_LOCAL_DEF( FT_Error )
  ps_parser_load_field( PS_Parser       parser,
                        const T1_Field  field,
                        void**          objects,
                        FT_UInt         max_objects,
                        FT_ULong*       pflags )
  {
    T1_TokenRec  token;
    FT_Byte*     cur;
    FT_Byte*     limit;
    FT_UInt      count;
    FT_UInt      idx;
    FT_Error     error;


    ps_parser_to_token( parser, &token );
    if ( !token.type )
      goto Fail;

    count = 1;
    idx   = 0;
    cur   = token.start;
    limit = token.limit;

    /* we must detect arrays */
    if ( field->type == T1_FIELD_TYPE_BBOX )
    {
      T1_TokenRec  token2;
      FT_Byte*     old_cur   = parser->cursor;
      FT_Byte*     old_limit = parser->limit;


      parser->cursor = token.start;
      parser->limit  = token.limit;

      ps_parser_to_token( parser, &token2 );
      parser->cursor = old_cur;
      parser->limit  = old_limit;

      if ( token2.type == T1_TOKEN_TYPE_ARRAY )
        goto FieldArray;
    }
    else if ( token.type == T1_TOKEN_TYPE_ARRAY )
    {
    FieldArray:
      /* if this is an array, and we have no blend, an error occurs */
      if ( max_objects == 0 )
        goto Fail;

      count = max_objects;
      idx = 1;
    }

    for ( ; count > 0; count--, idx++ )
    {
      FT_Byte*    q = (FT_Byte*)objects[idx] + field->offset;
      FT_Long     val;
      FT_String*  string;


      switch ( field->type )
      {
      case T1_FIELD_TYPE_BOOL:
        val = t1_tobool( &cur, limit );
        goto Store_Integer;

      case T1_FIELD_TYPE_FIXED:
        val = t1_tofixed( &cur, limit, 0 );
        goto Store_Integer;

      case T1_FIELD_TYPE_FIXED_1000:
        val = t1_tofixed( &cur, limit, 3 );
        goto Store_Integer;

      case T1_FIELD_TYPE_INTEGER:
        val = t1_toint( &cur, limit );
        goto Store_Integer;

      Store_Integer:
        switch ( field->size )
        {
        case 1:
          *(FT_Byte*)q = (FT_Byte)val;
          break;

        case 2:
          *(FT_UShort*)q = (FT_UShort)val;
          break;

        case 4:
          *(FT_UInt32*)q = (FT_UInt32)val;