cidload.c

奇趣公司比较新的qt/emd版本

              if ( !name )
                break;

              if ( cur[0] == name[0]                                 &&
                   len == (FT_PtrDist)ft_strlen( (const char*)name ) )
              {
                FT_PtrDist  n;


                for ( n = 1; n < len; n++ )
                  if ( cur[n] != name[n] )
                    break;

                if ( n >= len )
                {
                  /* we found it - run the parsing callback */
                  parser->root.error = cid_load_keyword( face,
                                                         loader,
                                                         keyword );
                  if ( parser->root.error )
                    return parser->root.error;
                  break;
                }
              }
              keyword++;
            }
          }
        }

        cur = parser->root.cursor;
      }
    }
    return parser->root.error;
  }


  /* read the subrmap and the subrs of each font dict */
  static FT_Error
  cid_read_subrs( CID_Face  face )
  {
    CID_FaceInfo   cid    = &face->cid;
    FT_Memory      memory = face->root.memory;
    FT_Stream      stream = face->cid_stream;
    FT_Error       error;
    FT_Int         n;
    CID_Subrs      subr;
    FT_UInt        max_offsets = 0;
    FT_ULong*      offsets = 0;
    PSAux_Service  psaux = (PSAux_Service)face->psaux;


    if ( FT_NEW_ARRAY( face->subrs, cid->num_dicts ) )
      goto Exit;

    subr = face->subrs;
    for ( n = 0; n < cid->num_dicts; n++, subr++ )
    {
      CID_FaceDict  dict  = cid->font_dicts + n;
      FT_Int        lenIV = dict->private_dict.lenIV;
      FT_UInt       count, num_subrs = dict->num_subrs;
      FT_ULong      data_len;
      FT_Byte*      p;


      /* reallocate offsets array if needed */
      if ( num_subrs + 1 > max_offsets )
      {
        FT_UInt  new_max = FT_PAD_CEIL( num_subrs + 1, 4 );


        if ( FT_RENEW_ARRAY( offsets, max_offsets, new_max ) )
          goto Fail;

        max_offsets = new_max;
      }

      /* read the subrmap's offsets */
      if ( FT_STREAM_SEEK( cid->data_offset + dict->subrmap_offset ) ||
           FT_FRAME_ENTER( ( num_subrs + 1 ) * dict->sd_bytes )      )
        goto Fail;

      p = (FT_Byte*)stream->cursor;
      for ( count = 0; count <= num_subrs; count++ )
        offsets[count] = cid_get_offset( &p, (FT_Byte)dict->sd_bytes );

      FT_FRAME_EXIT();

      /* now, compute the size of subrs charstrings, */
      /* allocate, and read them                     */
      data_len = offsets[num_subrs] - offsets[0];

      if ( FT_NEW_ARRAY( subr->code, num_subrs + 1 ) ||
               FT_ALLOC( subr->code[0], data_len )   )
        goto Fail;

      if ( FT_STREAM_SEEK( cid->data_offset + offsets[0] ) ||
           FT_STREAM_READ( subr->code[0], data_len )  )
        goto Fail;

      /* set up pointers */
      for ( count = 1; count <= num_subrs; count++ )
      {
        FT_ULong  len;


        len               = offsets[count] - offsets[count - 1];
        subr->code[count] = subr->code[count - 1] + len;
      }

      /* decrypt subroutines, but only if lenIV >= 0 */
      if ( lenIV >= 0 )
      {
        for ( count = 0; count < num_subrs; count++ )
        {
          FT_ULong  len;


          len = offsets[count + 1] - offsets[count];
          psaux->t1_decrypt( subr->code[count], len, 4330 );
        }
      }

      subr->num_subrs = num_subrs;
    }

  Exit:
    FT_FREE( offsets );
    return error;

  Fail:
    if ( face->subrs )
    {
      for ( n = 0; n < cid->num_dicts; n++ )
      {
        if ( face->subrs[n].code )
          FT_FREE( face->subrs[n].code[0] );

        FT_FREE( face->subrs[n].code );
      }
      FT_FREE( face->subrs );
    }
    goto Exit;
  }


  static void
  t1_init_loader( CID_Loader*  loader,
                  CID_Face     face )
  {
    FT_UNUSED( face );

    FT_MEM_ZERO( loader, sizeof ( *loader ) );
  }


  static void
  t1_done_loader( CID_Loader*  loader )
  {
    CID_Parser*  parser = &loader->parser;


    /* finalize parser */
    cid_parser_done( parser );
  }


  static FT_Error
  cid_hex_to_binary( FT_Byte*  data,
                     FT_Long   data_len,
                     FT_ULong  offset,
                     CID_Face  face )
  {
    FT_Stream  stream = face->root.stream;
    FT_Error   error;

    FT_Byte    buffer[256];
    FT_Byte   *p, *plimit;
    FT_Byte   *d, *dlimit;
    FT_Byte    val;

    FT_Bool    upper_nibble, done;


    if ( FT_STREAM_SEEK( offset ) )
      goto Exit;

    d      = data;
    dlimit = d + data_len;
    p      = buffer;
    plimit = p;

    upper_nibble = 1;
    done         = 0;

    while ( d < dlimit )
    {
      if ( p >= plimit )
      {
        FT_ULong  oldpos = FT_STREAM_POS();
        FT_ULong  size   = stream->size - oldpos;


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

        if ( FT_STREAM_READ( buffer, 256 > size ? size : 256 ) )
          goto Exit;
        p      = buffer;
        plimit = p + FT_STREAM_POS() - oldpos;
      }

      if ( ft_isdigit( *p ) )
        val = (FT_Byte)( *p - '0' );
      else if ( *p >= 'a' && *p <= 'f' )
        val = (FT_Byte)( *p - 'a' );
      else if ( *p >= 'A' && *p <= 'F' )
        val = (FT_Byte)( *p - 'A' + 10 );
      else if ( *p == ' '  ||
                *p == '\t' ||
                *p == '\r' ||
                *p == '\n' ||
                *p == '\f' ||
                *p == '\0' )
      {
        p++;
        continue;
      }
      else if ( *p == '>' )
      {
        val  = 0;
        done = 1;
      }
      else
      {
        error = CID_Err_Syntax_Error;
        goto Exit;
      }

      if ( upper_nibble )
        *d = (FT_Byte)( val << 4 );
      else
      {
        *d = (FT_Byte)( *d + val );
        d++;
      }

      upper_nibble = (FT_Byte)( 1 - upper_nibble );

      if ( done )
        break;

      p++;
    }

    error = CID_Err_Ok;

  Exit:
    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  cid_face_open( CID_Face  face,
                 FT_Int    face_index )
  {
    CID_Loader   loader;
    CID_Parser*  parser;
    FT_Memory    memory = face->root.memory;
    FT_Error     error;


    t1_init_loader( &loader, face );

    parser = &loader.parser;
    error = cid_parser_new( parser, face->root.stream, face->root.memory,
                            (PSAux_Service)face->psaux );
    if ( error )
      goto Exit;

    error = cid_parse_dict( face, &loader,
                            parser->postscript,
                            parser->postscript_len );
    if ( error )
      goto Exit;

    if ( face_index < 0 )
      goto Exit;

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

    if ( parser->binary_length )
    {
      /* we must convert the data section from hexadecimal to binary */
      if ( FT_ALLOC( face->binary_data, parser->binary_length )         ||
           cid_hex_to_binary( face->binary_data, parser->binary_length,
                              parser->data_offset, face )               )
        goto Exit;

      FT_Stream_OpenMemory( face->cid_stream,
                            face->binary_data, parser->binary_length );
      face->cid.data_offset = 0;
    }
    else
    {
      *face->cid_stream     = *face->root.stream;
      face->cid.data_offset = loader.parser.data_offset;
    }

    error = cid_read_subrs( face );

  Exit:
    t1_done_loader( &loader );
    return error;
  }


/* END */