cffload.c

source code: Covert TXT to PDF

    0,
    140,
    141,
    142,
    143,
    0,
    0,
    0,
    0,
    0,
    144,
    0,
    0,
    0,
    145,
    0,
    0,
    146,
    147,
    148,
    149,
    0,
    0,
    0,
    0
  };

  static const FT_UShort  cff_expert_encoding[256] =
  {
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    1,
    229,
    230,
    0,
    231,
    232,
    233,
    234,
    235,
    236,
    237,
    238,
    13,
    14,
    15,
    99,
    239,
    240,
    241,
    242,
    243,
    244,
    245,
    246,
    247,
    248,
    27,
    28,
    249,
    250,
    251,
    252,
    0,
    253,
    254,
    255,
    256,
    257,
    0,
    0,
    0,
    258,
    0,
    0,
    259,
    260,
    261,
    262,
    0,
    0,
    263,
    264,
    265,
    0,
    266,
    109,
    110,
    267,
    268,
    269,
    0,
    270,
    271,
    272,
    273,
    274,
    275,
    276,
    277,
    278,
    279,
    280,
    281,
    282,
    283,
    284,
    285,
    286,
    287,
    288,
    289,
    290,
    291,
    292,
    293,
    294,
    295,
    296,
    297,
    298,
    299,
    300,
    301,
    302,
    303,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    304,
    305,
    306,
    0,
    0,
    307,
    308,
    309,
    310,
    311,
    0,
    312,
    0,
    0,
    312,
    0,
    0,
    314,
    315,
    0,
    0,
    316,
    317,
    318,
    0,
    0,
    0,
    158,
    155,
    163,
    319,
    320,
    321,
    322,
    323,
    324,
    325,
    0,
    0,
    326,
    150,
    164,
    169,
    327,
    328,
    329,
    330,
    331,
    332,
    333,
    334,
    335,
    336,
    337,
    338,
    339,
    340,
    341,
    342,
    343,
    344,
    345,
    346,
    347,
    348,
    349,
    350,
    351,
    352,
    353,
    354,
    355,
    356,
    357,
    358,
    359,
    360,
    361,
    362,
    363,
    364,
    365,
    366,
    367,
    368,
    369,
    370,
    371,
    372,
    373,
    374,
    375,
    376,
    377,
    378
  };
#endif


  FT_LOCAL_DEF FT_UShort
  CFF_Get_Standard_Encoding( FT_UInt  charcode )
  {
    return  (FT_UShort)(charcode < 256 ? cff_standard_encoding[charcode] : 0);
  }


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_cffload


  /* read a CFF offset from memory */
  static FT_ULong
  cff_get_offset( FT_Byte*  p,
                  FT_Byte   off_size )
  {
    FT_ULong  result;


    for ( result = 0; off_size > 0; off_size-- )
    {
      result <<= 8;
      result  |= *p++;
    }

    return result;
  }


  static FT_Error
  cff_new_index( CFF_Index*  index,
                 FT_Stream   stream,
                 FT_Bool     load )
  {
    FT_Error   error;
    FT_Memory  memory = stream->memory;
    FT_UShort  count;


    MEM_Set( index, 0, sizeof ( *index ) );

    index->stream = stream;
    if ( !READ_UShort( count ) &&
         count > 0             )
    {
      FT_Byte*   p;
      FT_Byte    offsize;
      FT_ULong   data_size;
      FT_ULong*  poff;


      /* there is at least one element; read the offset size,           */
      /* then access the offset table to compute the index's total size */
      if ( READ_Byte( offsize ) )
        goto Exit;

      index->stream   = stream;
      index->count    = count;
      index->off_size = offsize;
      data_size       = (FT_ULong)( count + 1 ) * offsize;

      if ( ALLOC_ARRAY( index->offsets, count + 1, FT_ULong ) ||
           ACCESS_Frame( data_size )                          )
        goto Exit;

      poff = index->offsets;
      p    = (FT_Byte*)stream->cursor;

      for ( ; (FT_Short)count >= 0; count-- )
      {
        poff[0] = cff_get_offset( p, offsize );
        poff++;
        p += offsize;
      }

      FORGET_Frame();

      index->data_offset = FILE_Pos();
      data_size          = poff[-1] - 1;

      if ( load )
      {
        /* load the data */
        if ( EXTRACT_Frame( data_size, index->bytes ) )
          goto Exit;
      }
      else
      {
        /* skip the data */
        if ( FILE_Skip( data_size ) )
          goto Exit;
      }
    }

  Exit:
    if ( error )
      FREE( index->offsets );

    return error;
  }


  static void
  cff_done_index( CFF_Index*  index )
  {
    if ( index->stream )
    {
      FT_Stream  stream = index->stream;
      FT_Memory  memory = stream->memory;


      if ( index->bytes )
        RELEASE_Frame( index->bytes );

      FREE( index->offsets );
      MEM_Set( index, 0, sizeof ( *index ) );
    }
  }


  static FT_Error
  cff_explicit_index( CFF_Index*  index,
                      FT_Byte***  table )
  {
    FT_Error   error  = 0;
    FT_Memory  memory = index->stream->memory;
    FT_UInt    n, offset, old_offset;
    FT_Byte**  t;


    *table = 0;

    if ( index->count > 0 && !ALLOC_ARRAY( t, index->count + 1, FT_Byte* ) )
    {
      old_offset = 1;
      for ( n = 0; n <= index->count; n++ )
      {
        offset = index->offsets[n];
        if ( !offset )
          offset = old_offset;

        t[n] = index->bytes + offset - 1;

        old_offset = offset;
      }
      *table = t;
    }

    return error;
  }


  FT_LOCAL_DEF FT_Error
  CFF_Access_Element( CFF_Index*  index,
                      FT_UInt     element,
                      FT_Byte**   pbytes,
                      FT_ULong*   pbyte_len )
  {
    FT_Error  error = 0;


    if ( index && index->count > element )
    {
      /* compute start and end offsets */
      FT_ULong  off1, off2 = 0;


      off1 = index->offsets[element];
      if ( off1 )
      {
        do
        {
          element++;
          off2 = index->offsets[element];

        } while ( off2 == 0 && element < index->count );

        if ( !off2 )
          off1 = 0;
      }

      /* access element */
      if ( off1 )
      {
        *pbyte_len = off2 - off1;

        if ( index->bytes )
        {
          /* this index was completely loaded in memory, that's easy */
          *pbytes = index->bytes + off1 - 1;
        }
        else
        {
          /* this index is still on disk/file, access it through a frame */
          FT_Stream  stream = index->stream;


          if ( FILE_Seek( index->data_offset + off1 - 1 ) ||
               EXTRACT_Frame( off2 - off1, *pbytes )      )
            goto Exit;
        }
      }
      else
      {
        /* empty index element */
        *pbytes    = 0;
        *pbyte_len = 0;
      }
    }
    else
      error = CFF_Err_Invalid_Argument;

  Exit:
    return error;
  }


  FT_LOCAL_DEF void
  CFF_Forget_Element( CFF_Index*  index,
                      FT_Byte**   pbytes )
  {
    if ( index->bytes == 0 )
    {
      FT_Stream  stream = index->stream;


      RELEASE_Frame( *pbytes );
    }
  }


  FT_LOCAL_DEF FT_String*
  CFF_Get_Name( CFF_Index*  index,
                FT_UInt     element )
  {
    FT_Memory   memory = index->stream->memory;
    FT_Byte*    bytes;
    FT_ULong    byte_len;
    FT_Error    error;
    FT_String*  name = 0;


    error = CFF_Access_Element( index, element, &bytes, &byte_len );
    if ( error )
      goto Exit;

    if ( !ALLOC( name, byte_len + 1 ) )
    {
      MEM_Copy( name, bytes, byte_len );
      name[byte_len] = 0;
    }
    CFF_Forget_Element( index, &bytes );

  Exit:
    return name;
  }


  FT_LOCAL_DEF FT_String*
  CFF_Get_String( CFF_Index*          index,
                  FT_UInt             sid,
                  PSNames_Interface*  interface )
  {
    /* if it is not a standard string, return it */
    if ( sid > 390 )
      return CFF_Get_Name( index, sid - 391 );

    /* that's a standard string, fetch a copy from the PSName module */
    {
      FT_String*   name       = 0;
      const char*  adobe_name = interface->adobe_std_strings( sid );
      FT_UInt      len;


      if ( adobe_name )
      {
        FT_Memory memory = index->stream->memory;
        FT_Error  error;


        len = (FT_UInt)strlen( adobe_name );
        if ( !ALLOC( name, len + 1 ) )
        {
          MEM_Copy( name, adobe_name, len );
          name[len] = 0;
        }
      }

      return name;
    }
  }


  /*************************************************************************/
  /*************************************************************************/
  /***                                                                   ***/
  /***   FD Select table support                                         ***/
  /***                                                                   ***/
  /*************************************************************************/
  /*************************************************************************/


  static void
  CFF_Done_FD_Select( CFF_FD_Select*  select,
                      FT_Stream       stream )
  {
    if ( select->data )
      RELEASE_Frame( select->data );

    select->data_size   = 0;
    select->format      = 0;
    select->range_count = 0;
  }


  static FT_Error
  CFF_Load_FD_Select( CFF_FD_Select*  select,
                      FT_UInt         num_glyphs,
                      FT_Stream       stream,
                      FT_ULong        offset )
  {
    FT_Error  error;
    FT_Byte   format;
    FT_UInt   num_ranges;


    /* read format */
    if ( FILE_Seek( offset ) || READ_Byte( format ) )
      goto Exit;

    select->format      = format;
    select->cache_count = 0;   /* clear cache */

    switch ( format )
    {
    case 0:     /* format 0, that's simple */
      select->data_size = num_glyphs;
      goto Load_Data;

    case 3:     /* format 3, a tad more complex */
      if ( READ_UShort( num_ranges ) )
        goto Exit;

      select->data_size = num_ranges * 3 + 2;

    Load_Data:
      if ( EXTRACT_Frame( select->data_size, select->data ) )
        goto Exit;
      break;

    default:    /* hmm... that's wrong */
      error = CFF_Err_Invalid_File_Format;
    }

  Exit:
    return error;
  }


  FT_LOCAL_DEF FT_Byte
  CFF_Get_FD( CFF_FD_Select*  select,
              FT_UInt         glyph_index )
  {
    FT_Byte  fd = 0;


    switch ( select->format )
    {
    case 0:
      fd = select->data[glyph_index];
      break;

    case 3:
      /* first, compare to cache */
      if ( (FT_UInt)(glyph_index-select->cache_first) < select->cache_count )
      {
        fd = select->cache_fd;
        break;
      }

      /* then, lookup the ranges array */
      {
        FT_Byte*  p       = select->data;
        FT_Byte*  p_limit = p + select->data_size;
        FT_Byte   fd2;
        FT_UInt   first, limit;


        first = NEXT_UShort( p );
        do
        {
          if ( glyph_index < first )
            break;

          fd2   = *p++;
          limit = NEXT_UShort( p );

          if ( glyph_index < limit )
          {
            fd = fd2;

            /* update cache */
            select->cache_first = first;
            select->cache_count = limit-first;
            select->cache_fd    = fd2;
            break;
          }
          first = limit;

        } while ( p < p_limit );
      }
      break;

    default:
      ;
    }

    return fd;
  }


  /*************************************************************************/
  /*************************************************************************/
  /***                                                                   ***/
  /***   CFF font support                                                ***/
  /***                                                                   ***/
  /*************************************************************************/
  /*************************************************************************/

  static void
  CFF_Done_Encoding( CFF_Encoding*  encoding,
                     FT_Stream      stream )
  {
    FT_Memory  memory = stream->memory;


    FREE( encoding->codes );
    FREE( encoding->sids  );
    encoding->format = 0;
    encoding->offset = 0;
    encoding->codes  = 0;
    encoding->sids   = 0;
  }


  static void
  CFF_Done_Charset( CFF_Charset*  charset,
                    FT_Stream     stream )
  {
    FT_Memory  memory = stream->memory;


    FREE( charset->sids );
    charset->format = 0;
    charset->offset = 0;
    charset->sids   = 0;
  }


  static FT_Error
  CFF_Load_Charset( CFF_Charset*  charset,
                    FT_UInt       num_glyphs,
                    FT_Stream     stream,
                    FT_ULong      base_offset,