tt_face_build_cmaps ( TT_Face face )
Definition at line 3389 of file ttcmap.c.
  {
    FT_Byte*           table = face->cmap_table;
    FT_Byte*           limit = table + face->cmap_size;
    FT_UInt volatile   num_cmaps;
    FT_Byte* volatile  p     = table;
    FT_Library         library = FT_FACE_LIBRARY( face );

    FT_UNUSED( library );


    if ( !p || p + 4 > limit )
      return SFNT_Err_Invalid_Table;

    /* only recognize format 0 */
    if ( TT_NEXT_USHORT( p ) != 0 )
    {
      p -= 2;
      FT_ERROR(( "tt_face_build_cmaps:"
                 " unsupported `cmap' table format = %d\n",
                 TT_PEEK_USHORT( p ) ));
      return SFNT_Err_Invalid_Table;
    }

    num_cmaps = TT_NEXT_USHORT( p );
#ifdef FT_MAX_CHARMAP_CACHEABLE
    if ( num_cmaps > FT_MAX_CHARMAP_CACHEABLE )
      FT_ERROR(( "tt_face_build_cmaps: too many cmap subtables(%d) "
                 "subtable#%d and later are loaded but cannot be searched\n",
                 num_cmaps, FT_MAX_CHARMAP_CACHEABLE + 1 ));
#endif

    for ( ; num_cmaps > 0 && p + 8 <= limit; num_cmaps-- )
    {
      FT_CharMapRec  charmap;
      FT_UInt32      offset;


      charmap.platform_id = TT_NEXT_USHORT( p );
      charmap.encoding_id = TT_NEXT_USHORT( p );
      charmap.face        = FT_FACE( face );
      charmap.encoding    = FT_ENCODING_NONE;  /* will be filled later */
      offset              = TT_NEXT_ULONG( p );

      if ( offset && offset <= face->cmap_size - 2 )
      {
        FT_Byte* volatile              cmap   = table + offset;
        volatile FT_UInt               format = TT_PEEK_USHORT( cmap );
        const TT_CMap_Class* volatile  pclazz = FT_TT_CMAP_CLASSES_GET;
        TT_CMap_Class volatile         clazz;


        for ( ; *pclazz; pclazz++ )
        {
          clazz = *pclazz;
          if ( clazz->format == format )
          {
            volatile TT_ValidatorRec  valid;
            volatile FT_Error         error = SFNT_Err_Ok;


            ft_validator_init( FT_VALIDATOR( &valid ), cmap, limit,
                               FT_VALIDATE_DEFAULT );

            valid.num_glyphs = (FT_UInt)face->max_profile.numGlyphs;

            if ( ft_setjmp(
              *((ft_jmp_buf*)&FT_VALIDATOR( &valid )->jump_buffer) ) == 0 )
            {
              /* validate this cmap sub-table */
              error = clazz->validate( cmap, FT_VALIDATOR( &valid ) );
            }

            if ( valid.validator.error == 0 )
            {
              FT_CMap  ttcmap;


              /* It might make sense to store the single variation selector */
              /* cmap somewhere special.  But it would have to be in the    */
              /* public FT_FaceRec, and we can't change that.               */

              if ( !FT_CMap_New( (FT_CMap_Class)clazz,
                                 cmap, &charmap, &ttcmap ) )
              {
                /* it is simpler to directly set `flags' than adding */
                /* a parameter to FT_CMap_New                        */
                ((TT_CMap)ttcmap)->flags = (FT_Int)error;
              }
            }
            else
            {
              FT_TRACE0(( "tt_face_build_cmaps:"
                          " broken cmap sub-table ignored\n" ));
            }
            break;
          }
        }

        if ( *pclazz == NULL )
        {
          FT_TRACE0(( "tt_face_build_cmaps:"
                      " unsupported cmap sub-table ignored\n" ));
        }
      }
    }

    return SFNT_Err_Ok;
  }
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