ttcmap.c

奇趣公司比较新的qt/emd版本

          }
        }

        last = end;
      }
    }

    return SFNT_Err_Ok;
  }


  FT_CALLBACK_DEF( FT_UInt )
  tt_cmap8_char_index( TT_CMap    cmap,
                       FT_UInt32  char_code )
  {
    FT_Byte*   table      = cmap->data;
    FT_UInt    result     = 0;
    FT_Byte*   p          = table + 8204;
    FT_UInt32  num_groups = TT_NEXT_ULONG( p );
    FT_UInt32  start, end, start_id;


    for ( ; num_groups > 0; num_groups-- )
    {
      start    = TT_NEXT_ULONG( p );
      end      = TT_NEXT_ULONG( p );
      start_id = TT_NEXT_ULONG( p );

      if ( char_code < start )
        break;

      if ( char_code <= end )
      {
        result = (FT_UInt)( start_id + char_code - start );
        break;
      }
    }
    return result;
  }


  FT_CALLBACK_DEF( FT_UInt )
  tt_cmap8_char_next( TT_CMap     cmap,
                      FT_UInt32  *pchar_code )
  {
    FT_UInt32  result     = 0;
    FT_UInt32  char_code  = *pchar_code + 1;
    FT_UInt    gindex     = 0;
    FT_Byte*   table      = cmap->data;
    FT_Byte*   p          = table + 8204;
    FT_UInt32  num_groups = TT_NEXT_ULONG( p );
    FT_UInt32  start, end, start_id;


    p = table + 8208;

    for ( ; num_groups > 0; num_groups-- )
    {
      start    = TT_NEXT_ULONG( p );
      end      = TT_NEXT_ULONG( p );
      start_id = TT_NEXT_ULONG( p );

      if ( char_code < start )
        char_code = start;

      if ( char_code <= end )
      {
        gindex = (FT_UInt)( char_code - start + start_id );
        if ( gindex != 0 )
        {
          result = char_code;
          goto Exit;
        }
      }
    }

  Exit:
    *pchar_code = result;
    return gindex;
  }


  FT_CALLBACK_DEF( FT_Error )
  tt_cmap8_get_info( TT_CMap       cmap,
                     TT_CMapInfo  *cmap_info )
  {
    FT_Byte*  p = cmap->data + 8;


    cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );

    return SFNT_Err_Ok;
  }


  FT_CALLBACK_TABLE_DEF
  const TT_CMap_ClassRec  tt_cmap8_class_rec =
  {
    {
      sizeof ( TT_CMapRec ),

      (FT_CMap_InitFunc)     tt_cmap_init,
      (FT_CMap_DoneFunc)     NULL,
      (FT_CMap_CharIndexFunc)tt_cmap8_char_index,
      (FT_CMap_CharNextFunc) tt_cmap8_char_next
    },
    8,
    (TT_CMap_ValidateFunc)   tt_cmap8_validate,
    (TT_CMap_Info_GetFunc)   tt_cmap8_get_info
  };

#endif /* TT_CONFIG_CMAP_FORMAT_8 */


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          FORMAT 10                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* TABLE OVERVIEW                                                        */
  /* --------------                                                        */
  /*                                                                       */
  /*   NAME      OFFSET  TYPE               DESCRIPTION                    */
  /*                                                                       */
  /*   format     0      USHORT             must be 10                     */
  /*   reserved   2      USHORT             reserved                       */
  /*   length     4      ULONG              length in bytes                */
  /*   language   8      ULONG              Mac language code              */
  /*                                                                       */
  /*   start     12      ULONG              first char in range            */
  /*   count     16      ULONG              number of chars in range       */
  /*   glyphIds  20      USHORT[count]      glyph indices covered          */
  /*                                                                       */

#ifdef TT_CONFIG_CMAP_FORMAT_10

  FT_CALLBACK_DEF( FT_Error )
  tt_cmap10_validate( FT_Byte*      table,
                      FT_Validator  valid )
  {
    FT_Byte*  p = table + 4;
    FT_ULong  length, count;


    if ( table + 20 > valid->limit )
      FT_INVALID_TOO_SHORT;

    length = TT_NEXT_ULONG( p );
    p      = table + 16;
    count  = TT_NEXT_ULONG( p );

    if ( table + length > valid->limit || length < 20 + count * 2 )
      FT_INVALID_TOO_SHORT;

    /* check glyph indices */
    if ( valid->level >= FT_VALIDATE_TIGHT )
    {
      FT_UInt  gindex;


      for ( ; count > 0; count-- )
      {
        gindex = TT_NEXT_USHORT( p );
        if ( gindex >= TT_VALID_GLYPH_COUNT( valid ) )
          FT_INVALID_GLYPH_ID;
      }
    }

    return SFNT_Err_Ok;
  }


  FT_CALLBACK_DEF( FT_UInt )
  tt_cmap10_char_index( TT_CMap    cmap,
                        FT_UInt32  char_code )
  {
    FT_Byte*   table  = cmap->data;
    FT_UInt    result = 0;
    FT_Byte*   p      = table + 12;
    FT_UInt32  start  = TT_NEXT_ULONG( p );
    FT_UInt32  count  = TT_NEXT_ULONG( p );
    FT_UInt32  idx    = (FT_ULong)( char_code - start );


    if ( idx < count )
    {
      p     += 2 * idx;
      result = TT_PEEK_USHORT( p );
    }
    return result;
  }


  FT_CALLBACK_DEF( FT_UInt )
  tt_cmap10_char_next( TT_CMap     cmap,
                       FT_UInt32  *pchar_code )
  {
    FT_Byte*   table     = cmap->data;
    FT_UInt32  char_code = *pchar_code + 1;
    FT_UInt    gindex    = 0;
    FT_Byte*   p         = table + 12;
    FT_UInt32  start     = TT_NEXT_ULONG( p );
    FT_UInt32  count     = TT_NEXT_ULONG( p );
    FT_UInt32  idx;


    if ( char_code < start )
      char_code = start;

    idx = (FT_UInt32)( char_code - start );
    p  += 2 * idx;

    for ( ; idx < count; idx++ )
    {
      gindex = TT_NEXT_USHORT( p );
      if ( gindex != 0 )
        break;
      char_code++;
    }

    *pchar_code = char_code;
    return gindex;
  }


  FT_CALLBACK_DEF( FT_Error )
  tt_cmap10_get_info( TT_CMap       cmap,
                      TT_CMapInfo  *cmap_info )
  {
    FT_Byte*  p = cmap->data + 8;


    cmap_info->language = (FT_ULong)TT_PEEK_ULONG( p );

    return SFNT_Err_Ok;
  }


  FT_CALLBACK_TABLE_DEF
  const TT_CMap_ClassRec  tt_cmap10_class_rec =
  {
    {
      sizeof ( TT_CMapRec ),

      (FT_CMap_InitFunc)     tt_cmap_init,
      (FT_CMap_DoneFunc)     NULL,
      (FT_CMap_CharIndexFunc)tt_cmap10_char_index,
      (FT_CMap_CharNextFunc) tt_cmap10_char_next
    },
    10,
    (TT_CMap_ValidateFunc)   tt_cmap10_validate,
    (TT_CMap_Info_GetFunc)   tt_cmap10_get_info
  };

#endif /* TT_CONFIG_CMAP_FORMAT_10 */


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          FORMAT 12                            *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /*************************************************************************/
  /*                                                                       */
  /* TABLE OVERVIEW                                                        */
  /* --------------                                                        */
  /*                                                                       */
  /*   NAME        OFFSET     TYPE       DESCRIPTION                       */
  /*                                                                       */
  /*   format      0          USHORT     must be 12                        */
  /*   reserved    2          USHORT     reserved                          */
  /*   length      4          ULONG      length in bytes                   */
  /*   language    8          ULONG      Mac language code                 */
  /*   count       12         ULONG      number of groups                  */
  /*               16                                                      */
  /*                                                                       */
  /* This header is followed by `count' groups of the following format:    */
  /*                                                                       */
  /*   start       0          ULONG      first charcode                    */
  /*   end         4          ULONG      last charcode                     */
  /*   startId     8          ULONG      start glyph id for the group      */
  /*                                                                       */

#ifdef TT_CONFIG_CMAP_FORMAT_12

  typedef struct  TT_CMap12Rec_
  {
    TT_CMapRec  cmap;
    FT_Bool     valid;
    FT_ULong    cur_charcode;
    FT_UInt     cur_gindex;
    FT_ULong    cur_group;
    FT_ULong    num_groups;

  } TT_CMap12Rec, *TT_CMap12;


  FT_CALLBACK_DEF( FT_Error )
  tt_cmap12_init( TT_CMap12  cmap,
                  FT_Byte*   table )
  {
    cmap->cmap.data  = table;

    table           += 12;
    cmap->num_groups = FT_PEEK_ULONG( table );

    cmap->valid      = 0;

    return SFNT_Err_Ok;
  }


  FT_CALLBACK_DEF( FT_Error )
  tt_cmap12_validate( FT_Byte*      table,
                      FT_Validator  valid )
  {
    FT_Byte*   p;
    FT_ULong   length;
    FT_ULong   num_groups;


    if ( table + 16 > valid->limit )
      FT_INVALID_TOO_SHORT;

    p      = table + 4;
    length = TT_NEXT_ULONG( p );

    p          = table + 12;
    num_groups = TT_NEXT_ULONG( p );

    if ( table + length > valid->limit || length < 16 + 12 * num_groups )
      FT_INVALID_TOO_SHORT;

    /* check groups, they must be in increasing order */
    {
      FT_ULong  n, start, end, start_id, last = 0;


      for ( n = 0; n < num_groups; n++ )
      {
        start    = TT_NEXT_ULONG( p );
        end      = TT_NEXT_ULONG( p );
        start_id = TT_NEXT_ULONG( p );

        if ( start > end )
          FT_INVALID_DATA;

        if ( n > 0 && start <= last )
          FT_INVALID_DATA;

        if ( valid->level >= FT_VALIDATE_TIGHT )
        {
          if ( start_id + end - start >= TT_VALID_GLYPH_COUNT( valid ) )
            FT_INVALID_GLYPH_ID;
        }

        last = end;
      }
    }

    return SFNT_Err_Ok;
  }


  /* search the index of the charcode next to cmap->cur_charcode */
  /* cmap->cur_group should be set up properly by caller         */
  /*                                                             */
  static void
  tt_cmap12_next( TT_CMap12  cmap )
  {
    FT_Byte*  p;
    FT_ULong  start, end, start_id, char_code;
    FT_ULong  n;
    FT_UInt   gindex;


    if ( cmap->cur_charcode >= 0xFFFFFFFFUL )
      goto Fail;

    char_code = cmap->cur_charcode + 1;

    n = cmap->cur_group;

    for ( n = cmap->cur_group; n < cmap->num_groups; n++ )
    {
      p        = cmap->cmap.data + 16 + 12 * n;
      start    = TT_NEXT_ULONG( p );
      end      = TT_NEXT_ULONG( p );
      start_id = TT_PEEK_ULONG( p );

      if ( char_code < start )
        char_code = start;

      for ( ; char_code <= end; char_code++ )
      {
        gindex = (FT_UInt)( start_id + char_code - start );