C++ FT_STREAM_POS函数代码示例

  static FT_Error
  ft_gzip_file_init( FT_GZipFile  zip,
                     FT_Stream    stream,
                     FT_Stream    source )
  {
    z_stream*  zstream = &zip->zstream;
    FT_Error   error   = Gzip_Err_Ok;


    zip->stream = stream;
    zip->source = source;
    zip->memory = stream->memory;

    zip->limit  = zip->buffer + FT_GZIP_BUFFER_SIZE;
    zip->cursor = zip->limit;
    zip->pos    = 0;

    /* check and skip .gz header */
    {
      stream = source;

      error = ft_gzip_check_header( stream );
      if ( error )
        goto Exit;

      zip->start = FT_STREAM_POS();
    }

    /* initialize zlib -- there is no zlib header in the compressed stream */
    zstream->zalloc = (alloc_func)ft_gzip_alloc;
    zstream->zfree  = (free_func) ft_gzip_free;
    zstream->opaque = stream->memory;

    zstream->avail_in = 0;
    zstream->next_in  = zip->buffer;

    if ( inflateInit2( zstream, -MAX_WBITS ) != Z_OK ||
         zstream->next_in == NULL                     )
      error = Gzip_Err_Invalid_File_Format;

  Exit:
    return error;
  }

  static FT_Error
  ft_lzw_file_init( FT_LZWFile  zip,
                    FT_Stream   stream,
                    FT_Stream   source )
  {
    s_zstate_t*  zstream = &zip->zstream;
    FT_Error     error   = LZW_Err_Ok;


    zip->stream = stream;
    zip->source = source;
    zip->memory = stream->memory;

    zip->limit  = zip->buffer + FT_LZW_BUFFER_SIZE;
    zip->cursor = zip->limit;
    zip->pos    = 0;

    /* check and skip .Z header */
    {
      stream = source;

      error = ft_lzw_check_header( source );
      if ( error )
        goto Exit;

      zip->start = FT_STREAM_POS();
    }

    /* initialize internal lzw variable */
    zinit( zstream );

    zstream->avail_in    = 0;
    zstream->next_in     = zip->buffer;
    zstream->zs_in_count = source->size - 2;

    if ( zstream->next_in == NULL )
      error = LZW_Err_Invalid_File_Format;

  Exit:
    return error;
  }

  static FT_Error
  load_post_names( TT_Face  face )
  {
    FT_Stream  stream;
    FT_Error   error;
    FT_Fixed   format;
    FT_ULong   post_len;
    FT_ULong   post_limit;


    /* get a stream for the face's resource */
    stream = face->root.stream;

    /* seek to the beginning of the PS names table */
    error = face->goto_table( face, TTAG_post, stream, &post_len );
    if ( error )
      goto Exit;

    post_limit = FT_STREAM_POS() + post_len;

    format = face->postscript.FormatType;

    /* go to beginning of subtable */
    if ( FT_STREAM_SKIP( 32 ) )
      goto Exit;

    /* now read postscript table */
    if ( format == 0x00020000L )
      error = load_format_20( face, stream, post_limit );
    else if ( format == 0x00028000L )
      error = load_format_25( face, stream, post_limit );
    else
      error = FT_THROW( Invalid_File_Format );

    face->postscript_names.loaded = 1;

  Exit:
    return error;
  }

  tt_face_load_font_dir( TT_Face    face,
                         FT_Stream  stream )
  {
    SFNT_HeaderRec  sfnt;
    FT_Error        error;
    FT_Memory       memory = stream->memory;
    TT_TableRec*    entry;
    FT_Int          nn;

    static const FT_Frame_Field  offset_table_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  SFNT_HeaderRec

      FT_FRAME_START( 8 ),
        FT_FRAME_USHORT( num_tables ),
        FT_FRAME_USHORT( search_range ),
        FT_FRAME_USHORT( entry_selector ),
        FT_FRAME_USHORT( range_shift ),
      FT_FRAME_END
    };


    FT_TRACE2(( "tt_face_load_font_dir: %08p\n", face ));

    /* read the offset table */

    sfnt.offset = FT_STREAM_POS();

    if ( FT_READ_ULONG( sfnt.format_tag )                    ||
         FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) )
      goto Exit;

    /* many fonts don't have these fields set correctly */
#if 0
    if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 )        ||
         sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 )
      return SFNT_Err_Unknown_File_Format;
#endif

    /* load the table directory */

    FT_TRACE2(( "-- Number of tables: %10u\n",    sfnt.num_tables ));
    FT_TRACE2(( "-- Format version:   0x%08lx\n", sfnt.format_tag ));

    /* check first */
    error = check_table_dir( &sfnt, stream );
    if ( error )
    {
      FT_TRACE2(( "tt_face_load_font_dir:"
                  " invalid table directory for TrueType\n" ));

      goto Exit;
    }

    face->num_tables = sfnt.num_tables;
    face->format_tag = sfnt.format_tag;

    if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )
      goto Exit;

    if ( FT_STREAM_SEEK( sfnt.offset + 12 )       ||
         FT_FRAME_ENTER( face->num_tables * 16L ) )
      goto Exit;

    entry = face->dir_tables;

    for ( nn = 0; nn < sfnt.num_tables; nn++ )
    {
      entry->Tag      = FT_GET_TAG4();
      entry->CheckSum = FT_GET_ULONG();
      entry->Offset   = FT_GET_LONG();
      entry->Length   = FT_GET_LONG();

      /* ignore invalid tables */
      if ( entry->Offset + entry->Length > stream->size )
        continue;
      else
      {
        FT_TRACE2(( "  %c%c%c%c  -  %08lx  -  %08lx\n",
                    (FT_Char)( entry->Tag >> 24 ),
                    (FT_Char)( entry->Tag >> 16 ),
                    (FT_Char)( entry->Tag >> 8  ),
                    (FT_Char)( entry->Tag       ),
                    entry->Offset,
                    entry->Length ));
        entry++;
      }
    }

    FT_FRAME_EXIT();

    FT_TRACE2(( "table directory loaded\n\n" ));

  Exit:
    return error;
  }

  static FT_Error
  load_format_20( TT_Face    face,
                  FT_Stream  stream,
                  FT_ULong   post_limit )
  {
    FT_Memory   memory = stream->memory;
    FT_Error    error;

    FT_Int      num_glyphs;
    FT_UShort   num_names;

    FT_UShort*  glyph_indices = NULL;
    FT_Char**   name_strings  = NULL;


    if ( FT_READ_USHORT( num_glyphs ) )
      goto Exit;

    /* UNDOCUMENTED!  The number of glyphs in this table can be smaller */
    /* than the value in the maxp table (cf. cyberbit.ttf).             */

    /* There already exist fonts which have more than 32768 glyph names */
    /* in this table, so the test for this threshold has been dropped.  */

    if ( num_glyphs > face->max_profile.numGlyphs )
    {
      error = FT_THROW( Invalid_File_Format );
      goto Exit;
    }

    /* load the indices */
    {
      FT_Int  n;


      if ( FT_NEW_ARRAY ( glyph_indices, num_glyphs ) ||
           FT_FRAME_ENTER( num_glyphs * 2L )          )
        goto Fail;

      for ( n = 0; n < num_glyphs; n++ )
        glyph_indices[n] = FT_GET_USHORT();

      FT_FRAME_EXIT();
    }

    /* compute number of names stored in table */
    {
      FT_Int  n;


      num_names = 0;

      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Int  idx;


        idx = glyph_indices[n];
        if ( idx >= 258 )
        {
          idx -= 257;
          if ( idx > num_names )
            num_names = (FT_UShort)idx;
        }
      }
    }

    /* now load the name strings */
    {
      FT_UShort  n;


      if ( FT_NEW_ARRAY( name_strings, num_names ) )
        goto Fail;

      for ( n = 0; n < num_names; n++ )
      {
        FT_UInt  len;


        if ( FT_STREAM_POS() >= post_limit )
          break;
        else
        {
          FT_TRACE6(( "load_format_20: %d byte left in post table\n",
                      post_limit - FT_STREAM_POS() ));

          if ( FT_READ_BYTE( len ) )
            goto Fail1;
        }

        if ( len > post_limit                   ||
             FT_STREAM_POS() > post_limit - len )
        {
          FT_Int  d = (FT_Int)post_limit - (FT_Int)FT_STREAM_POS();


          FT_ERROR(( "load_format_20:"
                     " exceeding string length (%d),"
                     " truncating at end of post table (%d byte left)\n",
//.........这里部分代码省略.........

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


    FT_MEM_ZERO( idx, sizeof ( *idx ) );

    idx->stream = stream;
    if ( !FT_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 ( FT_READ_BYTE( offsize ) )
        goto Exit;

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

      if ( FT_NEW_ARRAY( idx->offsets, count + 1 ) ||
           FT_FRAME_ENTER( data_size )             )
        goto Exit;

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

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

      FT_FRAME_EXIT();

      idx->data_offset = FT_STREAM_POS();
      data_size        = poff[-1] - 1;

      if ( load )
      {
        /* load the data */
        if ( FT_FRAME_EXTRACT( data_size, idx->bytes ) )
          goto Exit;
      }
      else
      {
        /* skip the data */
        if ( FT_STREAM_SKIP( data_size ) )
          goto Exit;
      }
    }

  Exit:
    if ( error )
      FT_FREE( idx->offsets );

    return error;
  }

  static FT_Error
  fnt_face_get_dll_fonts( FNT_Face  face )
  {
    FT_Error         error;
    FT_Stream        stream = FT_FACE( face )->stream;
    FT_Memory        memory = FT_FACE( face )->memory;
    WinMZ_HeaderRec  mz_header;


    face->fonts     = 0;
    face->num_fonts = 0;

    /* does it begin with a MZ header? */
    if ( FT_STREAM_SEEK( 0 )                                 ||
         FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) )
      goto Exit;

    error = FNT_Err_Unknown_File_Format;
    if ( mz_header.magic == WINFNT_MZ_MAGIC )
    {
      /* yes, now look for a NE header in the file */
      WinNE_HeaderRec  ne_header;


      if ( FT_STREAM_SEEK( mz_header.lfanew )                  ||
           FT_STREAM_READ_FIELDS( winne_header_fields, &ne_header ) )
        goto Exit;

      error = FNT_Err_Unknown_File_Format;
      if ( ne_header.magic == WINFNT_NE_MAGIC )
      {
        /* good, now look in the resource table for each FNT resource */
        FT_ULong   res_offset = mz_header.lfanew +
                                ne_header.resource_tab_offset;

        FT_UShort  size_shift;
        FT_UShort  font_count  = 0;
        FT_ULong   font_offset = 0;


        if ( FT_STREAM_SEEK( res_offset ) ||
             FT_FRAME_ENTER( ne_header.rname_tab_offset -
                             ne_header.resource_tab_offset ) )
          goto Exit;

        size_shift = FT_GET_USHORT_LE();

        for (;;)
        {
          FT_UShort  type_id, count;


          type_id = FT_GET_USHORT_LE();
          if ( !type_id )
            break;

          count = FT_GET_USHORT_LE();

          if ( type_id == 0x8008 )
          {
            font_count  = count;
            font_offset = (FT_ULong)( FT_STREAM_POS() + 4 +
                                      ( stream->cursor - stream->limit ) );
            break;
          }

          stream->cursor += 4 + count * 12;
        }
        FT_FRAME_EXIT();

        if ( !font_count || !font_offset )
        {
          FT_TRACE2(( "this file doesn't contain any FNT resources!\n" ));
          error = FNT_Err_Unknown_File_Format;
          goto Exit;
        }

        if ( FT_STREAM_SEEK( font_offset )           ||
             FT_NEW_ARRAY( face->fonts, font_count ) )
          goto Exit;

        face->num_fonts = font_count;

        if ( FT_FRAME_ENTER( (FT_Long)font_count * 12 ) )
          goto Exit;

        /* now read the offset and position of each FNT font */
        {
          FNT_Font  cur   = face->fonts;
          FNT_Font  limit = cur + font_count;


          for ( ; cur < limit; cur++ )
          {
            cur->offset     = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
            cur->fnt_size   = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
            cur->size_shift = size_shift;
            stream->cursor += 8;
          }
        }
//.........这里部分代码省略.........

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


    FT_MEM_ZERO( idx, sizeof ( *idx ) );

    idx->stream = stream;
    idx->start  = FT_STREAM_POS();
    if ( !FT_READ_USHORT( count ) &&
         count > 0                )
    {
      FT_Byte   offsize;
      FT_ULong  size;


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

      if ( offsize < 1 || offsize > 4 )
      {
        error = FT_Err_Invalid_Table;
        goto Exit;
      }

      idx->count    = count;
      idx->off_size = offsize;
      size          = (FT_ULong)( count + 1 ) * offsize;

      idx->data_offset = idx->start + 3 + size;

      if ( FT_STREAM_SKIP( size - offsize ) )
        goto Exit;

      size = cff_index_read_offset( idx, &error );
      if ( error )
        goto Exit;

      if ( size == 0 )
      {
        error = CFF_Err_Invalid_Table;
        goto Exit;
      }

      idx->data_size = --size;

      if ( load )
      {
        /* load the data */
        if ( FT_FRAME_EXTRACT( size, idx->bytes ) )
          goto Exit;
      }
      else
      {
        /* skip the data */
        if ( FT_STREAM_SKIP( size ) )
          goto Exit;
      }
    }

  Exit:
    if ( error )
      FT_FREE( idx->offsets );

    return error;
  }

  T1_Get_Private_Dict( T1_Parser      parser,
                       PSAux_Service  psaux )
  {
    FT_Stream  stream = parser->stream;
    FT_Memory  memory = parser->root.memory;
    FT_Error   error  = FT_Err_Ok;
    FT_ULong   size;


    if ( parser->in_pfb )
    {
      /* in the case of the PFB format, the private dictionary can be  */
      /* made of several segments.  We thus first read the number of   */
      /* segments to compute the total size of the private dictionary  */
      /* then re-read them into memory.                                */
      FT_Long    start_pos = FT_STREAM_POS();
      FT_UShort  tag;


      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error )
          goto Fail;

        if ( tag != 0x8002U )
          break;

        parser->private_len += size;

        if ( FT_STREAM_SKIP( size ) )
          goto Fail;
      }

      /* Check that we have a private dictionary there */
      /* and allocate private dictionary buffer        */
      if ( parser->private_len == 0 )
      {
        FT_ERROR(( "T1_Get_Private_Dict:"
                   " invalid private dictionary section\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Fail;
      }

      if ( FT_STREAM_SEEK( start_pos )                           ||
           FT_ALLOC( parser->private_dict, parser->private_len ) )
        goto Fail;

      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error || tag != 0x8002U )
        {
          error = FT_Err_Ok;
          break;
        }

        if ( FT_STREAM_READ( parser->private_dict + parser->private_len,
                             size ) )
          goto Fail;

        parser->private_len += size;
      }
    }
    else
    {
      /* We have already `loaded' the whole PFA font file into memory; */
      /* if this is a memory resource, allocate a new block to hold    */
      /* the private dict.  Otherwise, simply overwrite into the base  */
      /* dictionary block in the heap.                                 */

      /* first of all, look at the `eexec' keyword */
      FT_Byte*  cur   = parser->base_dict;
      FT_Byte*  limit = cur + parser->base_len;
      FT_Byte   c;


    Again:
      for (;;)
      {
        c = cur[0];
        if ( c == 'e' && cur + 9 < limit )  /* 9 = 5 letters for `eexec' + */
                                            /* whitespace + 4 chars        */
        {
          if ( cur[1] == 'e' &&
               cur[2] == 'x' &&
               cur[3] == 'e' &&
               cur[4] == 'c' )
            break;
        }
        cur++;
        if ( cur >= limit )
        {
          FT_ERROR(( "T1_Get_Private_Dict:"
                     " could not find `eexec' keyword\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
//.........这里部分代码省略.........

static FT_Error
fnt_face_get_dll_font( FNT_Face  face,
                       FT_Int    face_index )
{
    FT_Error         error;
    FT_Stream        stream = FT_FACE( face )->stream;
    FT_Memory        memory = FT_FACE( face )->memory;
    WinMZ_HeaderRec  mz_header;


    face->font = 0;

    /* does it begin with an MZ header? */
    if ( FT_STREAM_SEEK( 0 )                                      ||
            FT_STREAM_READ_FIELDS( winmz_header_fields, &mz_header ) )
        goto Exit;

    error = FNT_Err_Unknown_File_Format;
    if ( mz_header.magic == WINFNT_MZ_MAGIC )
    {
        /* yes, now look for an NE header in the file */
        WinNE_HeaderRec  ne_header;


        if ( FT_STREAM_SEEK( mz_header.lfanew )                       ||
                FT_STREAM_READ_FIELDS( winne_header_fields, &ne_header ) )
            goto Exit;

        error = FNT_Err_Unknown_File_Format;
        if ( ne_header.magic == WINFNT_NE_MAGIC )
        {
            /* good, now look into the resource table for each FNT resource */
            FT_ULong   res_offset  = mz_header.lfanew +
                                     ne_header.resource_tab_offset;
            FT_UShort  size_shift;
            FT_UShort  font_count  = 0;
            FT_ULong   font_offset = 0;


            if ( FT_STREAM_SEEK( res_offset )                    ||
                    FT_FRAME_ENTER( ne_header.rname_tab_offset -
                                    ne_header.resource_tab_offset ) )
                goto Exit;

            size_shift = FT_GET_USHORT_LE();

            for (;;)
            {
                FT_UShort  type_id, count;


                type_id = FT_GET_USHORT_LE();
                if ( !type_id )
                    break;

                count = FT_GET_USHORT_LE();

                if ( type_id == 0x8008U )
                {
                    font_count  = count;
                    font_offset = (FT_ULong)( FT_STREAM_POS() + 4 +
                                              ( stream->cursor - stream->limit ) );
                    break;
                }

                stream->cursor += 4 + count * 12;
            }

            FT_FRAME_EXIT();

            if ( !font_count || !font_offset )
            {
                FT_TRACE2(( "this file doesn't contain any FNT resources!\n" ));
                error = FNT_Err_Unknown_File_Format;
                goto Exit;
            }

            face->root.num_faces = font_count;

            if ( face_index >= font_count )
            {
                error = FNT_Err_Bad_Argument;
                goto Exit;
            }

            if ( FT_NEW( face->font ) )
                goto Exit;

            if ( FT_STREAM_SEEK( font_offset + face_index * 12 ) ||
                    FT_FRAME_ENTER( 12 )                            )
                goto Fail;

            face->font->offset     = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
            face->font->fnt_size   = (FT_ULong)FT_GET_USHORT_LE() << size_shift;
            face->font->size_shift = size_shift;

            stream->cursor += 8;

            FT_FRAME_EXIT();

//.........这里部分代码省略.........

  /* synthesized into a TTC with one offset table.              */
  static FT_Error
  sfnt_open_font( FT_Stream  stream,
                  TT_Face    face )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;
    FT_ULong   tag, offset;

    static const FT_Frame_Field  ttc_header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TTC_HeaderRec

      FT_FRAME_START( 8 ),
        FT_FRAME_LONG( version ),
        FT_FRAME_LONG( count   ),  /* this is ULong in the specs */
      FT_FRAME_END
    };


    face->ttc_header.tag     = 0;
    face->ttc_header.version = 0;
    face->ttc_header.count   = 0;

    offset = FT_STREAM_POS();

    if ( FT_READ_ULONG( tag ) )
      return error;

    if ( tag != 0x00010000UL &&
         tag != TTAG_ttcf    &&
         tag != TTAG_OTTO    &&
         tag != TTAG_true    &&
         tag != TTAG_typ1    &&
         tag != 0x00020000UL )
    {
      FT_TRACE2(( "  not a font using the SFNT container format\n" ));
      return FT_THROW( Unknown_File_Format );
    }

    face->ttc_header.tag = TTAG_ttcf;

    if ( tag == TTAG_ttcf )
    {
      FT_Int  n;


      FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));

      if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
        return error;

      if ( face->ttc_header.count == 0 )
        return FT_THROW( Invalid_Table );

      /* a rough size estimate: let's conservatively assume that there   */
      /* is just a single table info in each subfont header (12 + 16*1 = */
      /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */
      /* size of the TTC header plus `28*count' bytes for all subfont    */
      /* headers                                                         */
      if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) )
        return FT_THROW( Array_Too_Large );

      /* now read the offsets of each font in the file */
      if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
        return error;

      if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
        return error;

      for ( n = 0; n < face->ttc_header.count; n++ )
        face->ttc_header.offsets[n] = FT_GET_ULONG();

      FT_FRAME_EXIT();
    }
    else
    {
      FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));

      face->ttc_header.version = 1 << 16;
      face->ttc_header.count   = 1;

      if ( FT_NEW( face->ttc_header.offsets ) )
        return error;

      face->ttc_header.offsets[0] = offset;
    }

    return error;
  }

  cid_parser_new( CID_Parser*    parser,
                  FT_Stream      stream,
                  FT_Memory      memory,
                  PSAux_Service  psaux )
  {
    FT_Error  error;
    FT_ULong  base_offset, offset, ps_len;
    FT_Byte   buffer[256 + 10];
    FT_Int    buff_len;
    FT_Byte   *cur, *limit;
    FT_Byte   *arg1, *arg2;


    FT_MEM_ZERO( parser, sizeof ( *parser ) );
    psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory );

    parser->stream = stream;

    base_offset = FT_STREAM_POS();

    /* first of all, check the font format in the header */
    if ( FT_FRAME_ENTER( 31 ) )
      goto Exit;

    if ( ft_strncmp( (char *)stream->cursor,
                     "%!PS-Adobe-3.0 Resource-CIDFont", 31 ) )
    {
      FT_TRACE2(( "[not a valid CID-keyed font]\n" ));
      error = CID_Err_Unknown_File_Format;
    }

    FT_FRAME_EXIT();
    if ( error )
      goto Exit;

  Again:
    /* now, read the rest of the file until we find a `StartData' */
    buff_len = 256;
    for (;;)
    {
      FT_Byte*  p;
      FT_ULong  top_position;


      /* fill input buffer */
      limit     = buffer + 256;
      buff_len -= 256;
      if ( buff_len > 0 )
        FT_MEM_MOVE( buffer, limit, buff_len );

      p = buffer + buff_len;

      if ( FT_STREAM_READ( p, 256 + 10 - buff_len ) )
        goto Exit;

      top_position = FT_STREAM_POS() - buff_len;
      buff_len     = 256 + 10;

      /* look for `StartData' */
      for ( p = buffer; p < limit; p++ )
      {
        if ( p[0] == 'S' && ft_strncmp( (char*)p, "StartData", 9 ) == 0 )
        {
          /* save offset of binary data after `StartData' */
          offset = (FT_ULong)( top_position - ( limit - p ) + 10 );
          goto Found;
        }
      }
    }

  Found:
    /* we have found the start of the binary data.  We will now     */
    /* rewind and extract the frame corresponding to the PostScript */
    /* section                                                      */

    ps_len = offset - base_offset;
    if ( FT_STREAM_SEEK( base_offset )                  ||
         FT_FRAME_EXTRACT( ps_len, parser->postscript ) )
      goto Exit;

    parser->data_offset    = offset;
    parser->postscript_len = ps_len;
    parser->root.base      = parser->postscript;
    parser->root.cursor    = parser->postscript;
    parser->root.limit     = parser->root.cursor + ps_len;
    parser->num_dict       = -1;

    /* Finally, we check whether `StartData' was real -- it could be  */
    /* in a comment or string.  We also get its arguments to find out */
    /* whether the data is represented in binary or hex format.       */

    arg1 = parser->root.cursor;
    cid_parser_skip_PS_token( parser );
    cid_parser_skip_spaces  ( parser );
    arg2 = parser->root.cursor;
    cid_parser_skip_PS_token( parser );
    cid_parser_skip_spaces  ( parser );

    limit = parser->root.limit;
    cur   = parser->root.cursor;
//.........这里部分代码省略.........

cid_parser_new( CID_Parser*    parser,
                FT_Stream      stream,
                FT_Memory      memory,
                PSAux_Service  psaux )
{
    FT_Error  error;
    FT_ULong  base_offset, offset, ps_len;
    FT_Byte   *cur, *limit;
    FT_Byte   *arg1, *arg2;


    FT_MEM_ZERO( parser, sizeof ( *parser ) );
    psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory );

    parser->stream = stream;

    base_offset = FT_STREAM_POS();

    /* first of all, check the font format in the header */
    if ( FT_FRAME_ENTER( 31 ) )
        goto Exit;

    if ( ft_strncmp( (char *)stream->cursor,
                     "%!PS-Adobe-3.0 Resource-CIDFont", 31 ) )
    {
        FT_TRACE2(( "  not a CID-keyed font\n" ));
        error = FT_THROW( Unknown_File_Format );
    }

    FT_FRAME_EXIT();
    if ( error )
        goto Exit;

Again:
    /* now, read the rest of the file until we find */
    /* `StartData' or `/sfnts'                      */
    {
        FT_Byte   buffer[256 + 10];
        FT_ULong  read_len = 256 + 10;
        FT_Byte*  p        = buffer;


        for ( offset = FT_STREAM_POS(); ; offset += 256 )
        {
            FT_ULong  stream_len;


            stream_len = stream->size - FT_STREAM_POS();
            if ( stream_len == 0 )
            {
                FT_TRACE2(( "cid_parser_new: no `StartData' keyword found\n" ));
                error = FT_THROW( Invalid_File_Format );
                goto Exit;
            }

            read_len = FT_MIN( read_len, stream_len );
            if ( FT_STREAM_READ( p, read_len ) )
                goto Exit;

            if ( read_len < 256 )
                p[read_len]  = '\0';

            limit = p + read_len - 10;

            for ( p = buffer; p < limit; p++ )
            {
                if ( p[0] == 'S' && ft_strncmp( (char*)p, "StartData", 9 ) == 0 )
                {
                    /* save offset of binary data after `StartData' */
                    offset += (FT_ULong)( p - buffer + 10 );
                    goto Found;
                }
                else if ( p[1] == 's' && ft_strncmp( (char*)p, "/sfnts", 6 ) == 0 )
                {
                    offset += (FT_ULong)( p - buffer + 7 );
                    goto Found;
                }
            }

            FT_MEM_MOVE( buffer, p, 10 );
            read_len = 256;
            p = buffer + 10;
        }
    }

Found:
    /* We have found the start of the binary data or the `/sfnts' token. */
    /* Now rewind and extract the frame corresponding to this PostScript */
    /* section.                                                          */

    ps_len = offset - base_offset;
    if ( FT_STREAM_SEEK( base_offset )                  ||
            FT_FRAME_EXTRACT( ps_len, parser->postscript ) )
        goto Exit;

    parser->data_offset    = offset;
    parser->postscript_len = ps_len;
    parser->root.base      = parser->postscript;
    parser->root.cursor    = parser->postscript;
    parser->root.limit     = parser->root.cursor + ps_len;
//.........这里部分代码省略.........

  static FT_Error
  woff_open_font( FT_Stream  stream,
                  TT_Face    face )
  {
    FT_Memory       memory = stream->memory;
    FT_Error        error  = FT_Err_Ok;

    WOFF_HeaderRec  woff;
    WOFF_Table      tables  = NULL;
    WOFF_Table*     indices = NULL;

    FT_ULong        woff_offset;

    FT_Byte*        sfnt        = NULL;
    FT_Stream       sfnt_stream = NULL;

    FT_Byte*        sfnt_header;
    FT_ULong        sfnt_offset;

    FT_Int          nn;
    FT_ULong        old_tag = 0;

    static const FT_Frame_Field  woff_header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  WOFF_HeaderRec

      FT_FRAME_START( 44 ),
        FT_FRAME_ULONG ( signature ),
        FT_FRAME_ULONG ( flavor ),
        FT_FRAME_ULONG ( length ),
        FT_FRAME_USHORT( num_tables ),
        FT_FRAME_USHORT( reserved ),
        FT_FRAME_ULONG ( totalSfntSize ),
        FT_FRAME_USHORT( majorVersion ),
        FT_FRAME_USHORT( minorVersion ),
        FT_FRAME_ULONG ( metaOffset ),
        FT_FRAME_ULONG ( metaLength ),
        FT_FRAME_ULONG ( metaOrigLength ),
        FT_FRAME_ULONG ( privOffset ),
        FT_FRAME_ULONG ( privLength ),
      FT_FRAME_END
    };


    FT_ASSERT( stream == face->root.stream );
    FT_ASSERT( FT_STREAM_POS() == 0 );

    if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) )
      return error;

    /* Make sure we don't recurse back here or hit TTC code. */
    if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf )
      return FT_THROW( Invalid_Table );

    /* Miscellaneous checks. */
    if ( woff.length != stream->size                              ||
         woff.num_tables == 0                                     ||
         44 + woff.num_tables * 20UL >= woff.length               ||
         12 + woff.num_tables * 16UL >= woff.totalSfntSize        ||
         ( woff.totalSfntSize & 3 ) != 0                          ||
         ( woff.metaOffset == 0 && ( woff.metaLength != 0     ||
                                     woff.metaOrigLength != 0 ) ) ||
         ( woff.metaLength != 0 && woff.metaOrigLength == 0 )     ||
         ( woff.privOffset == 0 && woff.privLength != 0 )         )
      return FT_THROW( Invalid_Table );

    if ( FT_ALLOC( sfnt, woff.totalSfntSize ) ||
         FT_NEW( sfnt_stream )                )
      goto Exit;

    sfnt_header = sfnt;

    /* Write sfnt header. */
    {
      FT_UInt  searchRange, entrySelector, rangeShift, x;


      x             = woff.num_tables;
      entrySelector = 0;
      while ( x )
      {
        x            >>= 1;
        entrySelector += 1;
      }
      entrySelector--;

      searchRange = ( 1 << entrySelector ) * 16;
      rangeShift  = woff.num_tables * 16 - searchRange;

      WRITE_ULONG ( sfnt_header, woff.flavor );
      WRITE_USHORT( sfnt_header, woff.num_tables );
      WRITE_USHORT( sfnt_header, searchRange );
      WRITE_USHORT( sfnt_header, entrySelector );
      WRITE_USHORT( sfnt_header, rangeShift );
    }

    /* While the entries in the sfnt header must be sorted by the */
    /* tag value, the tables themselves are not.  We thus have to */
    /* sort them by offset and check that they don't overlap.     */
//.........这里部分代码省略.........

  T1_Get_Private_Dict( T1_Parser      parser,
                       PSAux_Service  psaux )
  {
    FT_Stream  stream = parser->stream;
    FT_Memory  memory = parser->root.memory;
    FT_Error   error  = 0;
    FT_Long    size;


    if ( parser->in_pfb )
    {
      /* in the case of the PFB format, the private dictionary can be  */
      /* made of several segments.  We thus first read the number of   */
      /* segments to compute the total size of the private dictionary  */
      /* then re-read them into memory.                                */
      FT_Long    start_pos = FT_STREAM_POS();
      FT_UShort  tag;


      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error )
          goto Fail;

        if ( tag != 0x8002U )
          break;

        parser->private_len += size;

        if ( FT_STREAM_SKIP( size ) )
          goto Fail;
      }

      /* Check that we have a private dictionary there */
      /* and allocate private dictionary buffer        */
      if ( parser->private_len == 0 )
      {
        FT_ERROR(( "T1_Get_Private_Dict:" ));
        FT_ERROR(( " invalid private dictionary section\n" ));
        error = T1_Err_Invalid_File_Format;
        goto Fail;
      }

      if ( FT_STREAM_SEEK( start_pos )                             ||
           FT_ALLOC( parser->private_dict, parser->private_len ) )
        goto Fail;

      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error || tag != 0x8002U )
        {
          error = T1_Err_Ok;
          break;
        }

        if ( FT_STREAM_READ( parser->private_dict + parser->private_len, size ) )
          goto Fail;

        parser->private_len += size;
      }
    }
    else
    {
      /* we have already `loaded' the whole PFA font file into memory; */
      /* if this is a memory resource, allocate a new block to hold    */
      /* the private dict. Otherwise, simply overwrite into the base   */
      /* dictionary block in the heap.                                 */

      /* first of all, look at the `eexec' keyword */
      FT_Byte*  cur   = parser->base_dict;
      FT_Byte*  limit = cur + parser->base_len;
      FT_Byte   c;


      for (;;)
      {
        c = cur[0];
        if ( c == 'e' && cur + 9 < limit )  /* 9 = 5 letters for `eexec' + */
                                            /* newline + 4 chars           */
        {
          if ( cur[1] == 'e' && cur[2] == 'x' &&
               cur[3] == 'e' && cur[4] == 'c' )
          {
            cur += 6; /* we skip the newling after the `eexec' */

            /* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
            /*      skip the extra \n if we find it                     */
            if ( cur[0] == '\n' )
              cur++;

            break;
          }
        }
        cur++;
        if ( cur >= limit )
        {
//.........这里部分代码省略.........