t42parse.c

奇趣公司比较新的qt/emd版本

               t42_is_space( cur[3] ) )
          {
            FT_TRACE6(( "encoding end\n" ));
            cur += 3;
            break;
          }
        }
        if ( *cur == ']' )
        {
          FT_TRACE6(( "encoding end\n" ));
          cur++;
          break;
        }

        /* check whether we've found an entry */
        if ( ft_isdigit( *cur ) || only_immediates )
        {
          FT_Int  charcode;


          if ( only_immediates )
            charcode = n;
          else
          {
            charcode = (FT_Int)T1_ToInt( parser );
            T1_Skip_Spaces( parser );
          }

          cur = parser->root.cursor;

          if ( *cur == '/' && cur + 2 < limit && n < count )
          {
            FT_PtrDist  len;


            cur++;

            parser->root.cursor = cur;
            T1_Skip_PS_Token( parser );
            if ( parser->root.error )
              return;

            len = parser->root.cursor - cur;

            parser->root.error = T1_Add_Table( char_table, charcode,
                                               cur, len + 1 );
            if ( parser->root.error )
              return;
            char_table->elements[charcode][len] = '\0';

            n++;
          }
        }
        else
          T1_Skip_PS_Token( parser );

        T1_Skip_Spaces( parser );
      }

      face->type1.encoding_type  = T1_ENCODING_TYPE_ARRAY;
      parser->root.cursor        = cur;
    }

    /* Otherwise, we should have either `StandardEncoding', */
    /* `ExpertEncoding', or `ISOLatin1Encoding'             */
    else
    {
      if ( cur + 17 < limit                                            &&
           ft_strncmp( (const char*)cur, "StandardEncoding", 16 ) == 0 )
        face->type1.encoding_type = T1_ENCODING_TYPE_STANDARD;

      else if ( cur + 15 < limit                                          &&
                ft_strncmp( (const char*)cur, "ExpertEncoding", 14 ) == 0 )
        face->type1.encoding_type = T1_ENCODING_TYPE_EXPERT;

      else if ( cur + 18 < limit                                             &&
                ft_strncmp( (const char*)cur, "ISOLatin1Encoding", 17 ) == 0 )
        face->type1.encoding_type = T1_ENCODING_TYPE_ISOLATIN1;

      else
      {
        FT_ERROR(( "t42_parse_encoding: invalid token!\n" ));
        parser->root.error = T42_Err_Invalid_File_Format;
      }
    }
  }


  typedef enum
  {
    BEFORE_START,
    BEFORE_TABLE_DIR,
    OTHER_TABLES

  } T42_Load_Status;


  static void
  t42_parse_sfnts( T42_Face    face,
                   T42_Loader  loader )
  {
    T42_Parser  parser = &loader->parser;
    FT_Memory   memory = parser->root.memory;
    FT_Byte*    cur;
    FT_Byte*    limit  = parser->root.limit;
    FT_Error    error;
    FT_Int      num_tables = 0;
    FT_ULong    count, ttf_size = 0;

    FT_Long     n, string_size, old_string_size, real_size;
    FT_Byte*    string_buf = NULL;
    FT_Bool     alloc      = 0;

    T42_Load_Status  status;


    /* The format is                                */
    /*                                              */
    /*   /sfnts [ <hexstring> <hexstring> ... ] def */
    /*                                              */
    /* or                                           */
    /*                                              */
    /*   /sfnts [                                   */
    /*      <num_bin_bytes> RD <binary data>        */
    /*      <num_bin_bytes> RD <binary data>        */
    /*      ...                                     */
    /*   ] def                                      */
    /*                                              */
    /* with exactly one space after the `RD' token. */

    T1_Skip_Spaces( parser );

    if ( parser->root.cursor >= limit || *parser->root.cursor++ != '[' )
    {
      FT_ERROR(( "t42_parse_sfnts: can't find begin of sfnts vector!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    T1_Skip_Spaces( parser );
    status          = BEFORE_START;
    string_size     = 0;
    old_string_size = 0;
    count           = 0;

    while ( parser->root.cursor < limit )
    {
      cur = parser->root.cursor;

      if ( *cur == ']' )
      {
        parser->root.cursor++;
        goto Exit;
      }

      else if ( *cur == '<' )
      {
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          goto Exit;

        /* don't include delimiters */
        string_size = (FT_Long)( ( parser->root.cursor - cur - 2 + 1 ) / 2 );
        if ( FT_REALLOC( string_buf, old_string_size, string_size ) )
          goto Fail;

        alloc = 1;

        parser->root.cursor = cur;
        (void)T1_ToBytes( parser, string_buf, string_size, &real_size, 1 );
        old_string_size = string_size;
        string_size = real_size;
      }

      else if ( ft_isdigit( *cur ) )
      {
        string_size = T1_ToInt( parser );

        T1_Skip_PS_Token( parser );             /* `RD' */
        if ( parser->root.error )
          return;

        string_buf = parser->root.cursor + 1;   /* one space after `RD' */

        parser->root.cursor += string_size + 1;
        if ( parser->root.cursor >= limit )
        {
          FT_ERROR(( "t42_parse_sfnts: too many binary data!\n" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }
      }

      /* A string can have a trailing zero byte for padding.  Ignore it. */
      if ( string_buf[string_size - 1] == 0 && ( string_size % 2 == 1 ) )
        string_size--;

      for ( n = 0; n < string_size; n++ )
      {
        switch ( status )
        {
        case BEFORE_START:
          /* load offset table, 12 bytes */
          if ( count < 12 )
          {
            face->ttf_data[count++] = string_buf[n];
            continue;
          }
          else
          {
            num_tables = 16 * face->ttf_data[4] + face->ttf_data[5];
            status     = BEFORE_TABLE_DIR;
            ttf_size   = 12 + 16 * num_tables;

            if ( FT_REALLOC( face->ttf_data, 12, ttf_size ) )
              goto Fail;
          }
          /* fall through */

        case BEFORE_TABLE_DIR:
          /* the offset table is read; read the table directory */
          if ( count < ttf_size )
          {
            face->ttf_data[count++] = string_buf[n];
            continue;
          }
          else
          {
            int       i;
            FT_ULong  len;


            for ( i = 0; i < num_tables; i++ )
            {
              FT_Byte*  p = face->ttf_data + 12 + 16 * i + 12;


              len = FT_PEEK_ULONG( p );

              /* Pad to a 4-byte boundary length */
              ttf_size += ( len + 3 ) & ~3;
            }

            status         = OTHER_TABLES;
            face->ttf_size = ttf_size;

            /* there are no more than 256 tables, so no size check here */
            if ( FT_REALLOC( face->ttf_data, 12 + 16 * num_tables,
                             ttf_size + 1 ) )
              goto Fail;
          }
          /* fall through */

        case OTHER_TABLES:
          /* all other tables are just copied */
          if ( count >= ttf_size )
          {
            FT_ERROR(( "t42_parse_sfnts: too many binary data!\n" ));
            error = T42_Err_Invalid_File_Format;
            goto Fail;
          }
          face->ttf_data[count++] = string_buf[n];
        }
      }

      T1_Skip_Spaces( parser );
    }

    /* if control reaches this point, the format was not valid */
    error = T42_Err_Invalid_File_Format;

  Fail:
    parser->root.error = error;

  Exit:
    if ( alloc )
      FT_FREE( string_buf );
  }


  static void
  t42_parse_charstrings( T42_Face    face,
                         T42_Loader  loader )
  {
    T42_Parser     parser       = &loader->parser;
    PS_Table       code_table   = &loader->charstrings;
    PS_Table       name_table   = &loader->glyph_names;
    PS_Table       swap_table   = &loader->swap_table;
    FT_Memory      memory       = parser->root.memory;
    FT_Error       error;

    PSAux_Service  psaux        = (PSAux_Service)face->psaux;

    FT_Byte*       cur;
    FT_Byte*       limit        = parser->root.limit;
    FT_UInt        n;
    FT_UInt        notdef_index = 0;
    FT_Byte        notdef_found = 0;


    T1_Skip_Spaces( parser );

    if ( parser->root.cursor >= limit )
    {
      FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    if ( ft_isdigit( *parser->root.cursor ) )
    {
      loader->num_glyphs = (FT_UInt)T1_ToInt( parser );
      if ( parser->root.error )
        return;
    }
    else if ( *parser->root.cursor == '<' )
    {
      /* We have `<< ... >>'.  Count the number of `/' in the dictionary */
      /* to get its size.                                                */
      FT_UInt  count = 0;


      T1_Skip_PS_Token( parser );
      if ( parser->root.error )
        return;
      T1_Skip_Spaces( parser );
      cur = parser->root.cursor;

      while ( parser->root.cursor < limit )
      {
        if ( *parser->root.cursor == '/' )
          count++;
        else if ( *parser->root.cursor == '>' )
        {
          loader->num_glyphs  = count;
          parser->root.cursor = cur;        /* rewind */
          break;
        }
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          return;
        T1_Skip_Spaces( parser );
      }
    }
    else
    {
      FT_ERROR(( "t42_parse_charstrings: invalid token!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    if ( parser->root.cursor >= limit )
    {
      FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    /* initialize tables */

    error = psaux->ps_table_funcs->init( code_table,
                                         loader->num_glyphs,
                                         memory );
    if ( error )
      goto Fail;

    error = psaux->ps_table_funcs->init( name_table,
                                         loader->num_glyphs,
                                         memory );
    if ( error )
      goto Fail;

    /* Initialize table for swapping index notdef_index and */
    /* index 0 names and codes (if necessary).              */

    error = psaux->ps_table_funcs->init( swap_table, 4, memory );
    if ( error )
      goto Fail;

    n = 0;