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/src/freetype/src/pfr/pfrload.c

https://bitbucket.org/cabalistic/ogredeps/
C | 941 lines | 626 code | 225 blank | 90 comment | 85 complexity | 3637ba8f9a8f0352d3f96fe3b27d2b96 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  pfrload.c                                                              */
  4/*                                                                         */
  5/*    FreeType PFR loader (body).                                          */
  6/*                                                                         */
  7/*  Copyright 2002, 2003, 2004, 2005, 2007, 2009, 2010 by                  */
  8/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  9/*                                                                         */
 10/*  This file is part of the FreeType project, and may only be used,       */
 11/*  modified, and distributed under the terms of the FreeType project      */
 12/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
 13/*  this file you indicate that you have read the license and              */
 14/*  understand and accept it fully.                                        */
 15/*                                                                         */
 16/***************************************************************************/
 17
 18
 19#include "pfrload.h"
 20#include FT_INTERNAL_DEBUG_H
 21#include FT_INTERNAL_STREAM_H
 22
 23#include "pfrerror.h"
 24
 25#undef  FT_COMPONENT
 26#define FT_COMPONENT  trace_pfr
 27
 28
 29  /*************************************************************************/
 30  /*************************************************************************/
 31  /*****                                                               *****/
 32  /*****                          EXTRA ITEMS                          *****/
 33  /*****                                                               *****/
 34  /*************************************************************************/
 35  /*************************************************************************/
 36
 37
 38  FT_LOCAL_DEF( FT_Error )
 39  pfr_extra_items_skip( FT_Byte*  *pp,
 40                        FT_Byte*   limit )
 41  {
 42    return pfr_extra_items_parse( pp, limit, NULL, NULL );
 43  }
 44
 45
 46  FT_LOCAL_DEF( FT_Error )
 47  pfr_extra_items_parse( FT_Byte*       *pp,
 48                         FT_Byte*        limit,
 49                         PFR_ExtraItem   item_list,
 50                         FT_Pointer      item_data )
 51  {
 52    FT_Error  error = PFR_Err_Ok;
 53    FT_Byte*  p     = *pp;
 54    FT_UInt   num_items, item_type, item_size;
 55
 56
 57    PFR_CHECK( 1 );
 58    num_items = PFR_NEXT_BYTE( p );
 59
 60    for ( ; num_items > 0; num_items-- )
 61    {
 62      PFR_CHECK( 2 );
 63      item_size = PFR_NEXT_BYTE( p );
 64      item_type = PFR_NEXT_BYTE( p );
 65
 66      PFR_CHECK( item_size );
 67
 68      if ( item_list )
 69      {
 70        PFR_ExtraItem  extra = item_list;
 71
 72
 73        for ( extra = item_list; extra->parser != NULL; extra++ )
 74        {
 75          if ( extra->type == item_type )
 76          {
 77            error = extra->parser( p, p + item_size, item_data );
 78            if ( error ) goto Exit;
 79
 80            break;
 81          }
 82        }
 83      }
 84
 85      p += item_size;
 86    }
 87
 88  Exit:
 89    *pp = p;
 90    return error;
 91
 92  Too_Short:
 93    FT_ERROR(( "pfr_extra_items_parse: invalid extra items table\n" ));
 94    error = PFR_Err_Invalid_Table;
 95    goto Exit;
 96  }
 97
 98
 99  /*************************************************************************/
100  /*************************************************************************/
101  /*****                                                               *****/
102  /*****                          PFR HEADER                           *****/
103  /*****                                                               *****/
104  /*************************************************************************/
105  /*************************************************************************/
106
107   static const FT_Frame_Field  pfr_header_fields[] =
108   {
109#undef  FT_STRUCTURE
110#define FT_STRUCTURE  PFR_HeaderRec
111
112     FT_FRAME_START( 58 ),
113       FT_FRAME_ULONG ( signature ),
114       FT_FRAME_USHORT( version ),
115       FT_FRAME_USHORT( signature2 ),
116       FT_FRAME_USHORT( header_size ),
117
118       FT_FRAME_USHORT( log_dir_size ),
119       FT_FRAME_USHORT( log_dir_offset ),
120
121       FT_FRAME_USHORT( log_font_max_size ),
122       FT_FRAME_UOFF3 ( log_font_section_size ),
123       FT_FRAME_UOFF3 ( log_font_section_offset ),
124
125       FT_FRAME_USHORT( phy_font_max_size ),
126       FT_FRAME_UOFF3 ( phy_font_section_size ),
127       FT_FRAME_UOFF3 ( phy_font_section_offset ),
128
129       FT_FRAME_USHORT( gps_max_size ),
130       FT_FRAME_UOFF3 ( gps_section_size ),
131       FT_FRAME_UOFF3 ( gps_section_offset ),
132
133       FT_FRAME_BYTE  ( max_blue_values ),
134       FT_FRAME_BYTE  ( max_x_orus ),
135       FT_FRAME_BYTE  ( max_y_orus ),
136
137       FT_FRAME_BYTE  ( phy_font_max_size_high ),
138       FT_FRAME_BYTE  ( color_flags ),
139
140       FT_FRAME_UOFF3 ( bct_max_size ),
141       FT_FRAME_UOFF3 ( bct_set_max_size ),
142       FT_FRAME_UOFF3 ( phy_bct_set_max_size ),
143
144       FT_FRAME_USHORT( num_phy_fonts ),
145       FT_FRAME_BYTE  ( max_vert_stem_snap ),
146       FT_FRAME_BYTE  ( max_horz_stem_snap ),
147       FT_FRAME_USHORT( max_chars ),
148     FT_FRAME_END
149   };
150
151
152  FT_LOCAL_DEF( FT_Error )
153  pfr_header_load( PFR_Header  header,
154                   FT_Stream   stream )
155  {
156    FT_Error  error;
157
158
159    /* read header directly */
160    if ( !FT_STREAM_SEEK( 0 )                                &&
161         !FT_STREAM_READ_FIELDS( pfr_header_fields, header ) )
162    {
163      /* make a few adjustments to the header */
164      header->phy_font_max_size +=
165        (FT_UInt32)header->phy_font_max_size_high << 16;
166    }
167
168    return error;
169  }
170
171
172  FT_LOCAL_DEF( FT_Bool )
173  pfr_header_check( PFR_Header  header )
174  {
175    FT_Bool  result = 1;
176
177
178    /* check signature and header size */
179    if ( header->signature  != 0x50465230L ||   /* "PFR0" */
180         header->version     > 4           ||
181         header->header_size < 58          ||
182         header->signature2 != 0x0d0a      )    /* CR/LF  */
183    {
184      result = 0;
185    }
186    return  result;
187  }
188
189
190  /***********************************************************************/
191  /***********************************************************************/
192  /*****                                                             *****/
193  /*****                    PFR LOGICAL FONTS                        *****/
194  /*****                                                             *****/
195  /***********************************************************************/
196  /***********************************************************************/
197
198
199  FT_LOCAL_DEF( FT_Error )
200  pfr_log_font_count( FT_Stream  stream,
201                      FT_UInt32  section_offset,
202                      FT_UInt   *acount )
203  {
204    FT_Error  error;
205    FT_UInt   count;
206    FT_UInt   result = 0;
207
208
209    if ( FT_STREAM_SEEK( section_offset ) || FT_READ_USHORT( count ) )
210      goto Exit;
211
212    result = count;
213
214  Exit:
215    *acount = result;
216    return error;
217  }
218
219
220  FT_LOCAL_DEF( FT_Error )
221  pfr_log_font_load( PFR_LogFont  log_font,
222                     FT_Stream    stream,
223                     FT_UInt      idx,
224                     FT_UInt32    section_offset,
225                     FT_Bool      size_increment )
226  {
227    FT_UInt    num_log_fonts;
228    FT_UInt    flags;
229    FT_UInt32  offset;
230    FT_UInt32  size;
231    FT_Error   error;
232
233
234    if ( FT_STREAM_SEEK( section_offset ) ||
235         FT_READ_USHORT( num_log_fonts )  )
236      goto Exit;
237
238    if ( idx >= num_log_fonts )
239      return PFR_Err_Invalid_Argument;
240
241    if ( FT_STREAM_SKIP( idx * 5 ) ||
242         FT_READ_USHORT( size )    ||
243         FT_READ_UOFF3 ( offset )  )
244      goto Exit;
245
246    /* save logical font size and offset */
247    log_font->size   = size;
248    log_font->offset = offset;
249
250    /* now, check the rest of the table before loading it */
251    {
252      FT_Byte*  p;
253      FT_Byte*  limit;
254      FT_UInt   local;
255
256
257      if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( size ) )
258        goto Exit;
259
260      p     = stream->cursor;
261      limit = p + size;
262
263      PFR_CHECK(13);
264
265      log_font->matrix[0] = PFR_NEXT_LONG( p );
266      log_font->matrix[1] = PFR_NEXT_LONG( p );
267      log_font->matrix[2] = PFR_NEXT_LONG( p );
268      log_font->matrix[3] = PFR_NEXT_LONG( p );
269
270      flags = PFR_NEXT_BYTE( p );
271
272      local = 0;
273      if ( flags & PFR_LOG_STROKE )
274      {
275        local++;
276        if ( flags & PFR_LOG_2BYTE_STROKE )
277          local++;
278
279        if ( (flags & PFR_LINE_JOIN_MASK) == PFR_LINE_JOIN_MITER )
280          local += 3;
281      }
282      if ( flags & PFR_LOG_BOLD )
283      {
284        local++;
285        if ( flags & PFR_LOG_2BYTE_BOLD )
286          local++;
287      }
288
289      PFR_CHECK( local );
290
291      if ( flags & PFR_LOG_STROKE )
292      {
293        log_font->stroke_thickness = ( flags & PFR_LOG_2BYTE_STROKE )
294                                     ? PFR_NEXT_SHORT( p )
295                                     : PFR_NEXT_BYTE( p );
296
297        if ( ( flags & PFR_LINE_JOIN_MASK ) == PFR_LINE_JOIN_MITER )
298          log_font->miter_limit = PFR_NEXT_LONG( p );
299      }
300
301      if ( flags & PFR_LOG_BOLD )
302      {
303        log_font->bold_thickness = ( flags & PFR_LOG_2BYTE_BOLD )
304                                   ? PFR_NEXT_SHORT( p )
305                                   : PFR_NEXT_BYTE( p );
306      }
307
308      if ( flags & PFR_LOG_EXTRA_ITEMS )
309      {
310        error = pfr_extra_items_skip( &p, limit );
311        if (error) goto Fail;
312      }
313
314      PFR_CHECK(5);
315      log_font->phys_size   = PFR_NEXT_USHORT( p );
316      log_font->phys_offset = PFR_NEXT_ULONG( p );
317      if ( size_increment )
318      {
319        PFR_CHECK( 1 );
320        log_font->phys_size += (FT_UInt32)PFR_NEXT_BYTE( p ) << 16;
321      }
322    }
323
324  Fail:
325    FT_FRAME_EXIT();
326
327  Exit:
328    return error;
329
330  Too_Short:
331    FT_ERROR(( "pfr_log_font_load: invalid logical font table\n" ));
332    error = PFR_Err_Invalid_Table;
333    goto Fail;
334  }
335
336
337  /***********************************************************************/
338  /***********************************************************************/
339  /*****                                                             *****/
340  /*****                    PFR PHYSICAL FONTS                       *****/
341  /*****                                                             *****/
342  /***********************************************************************/
343  /***********************************************************************/
344
345
346  /* load bitmap strikes lists */
347  FT_CALLBACK_DEF( FT_Error )
348  pfr_extra_item_load_bitmap_info( FT_Byte*     p,
349                                   FT_Byte*     limit,
350                                   PFR_PhyFont  phy_font )
351  {
352    FT_Memory   memory = phy_font->memory;
353    PFR_Strike  strike;
354    FT_UInt     flags0;
355    FT_UInt     n, count, size1;
356    FT_Error    error = PFR_Err_Ok;
357
358
359    PFR_CHECK( 5 );
360
361    p += 3;  /* skip bctSize */
362    flags0 = PFR_NEXT_BYTE( p );
363    count  = PFR_NEXT_BYTE( p );
364
365    /* re-allocate when needed */
366    if ( phy_font->num_strikes + count > phy_font->max_strikes )
367    {
368      FT_UInt  new_max = FT_PAD_CEIL( phy_font->num_strikes + count, 4 );
369
370
371      if ( FT_RENEW_ARRAY( phy_font->strikes,
372                           phy_font->num_strikes,
373                           new_max ) )
374        goto Exit;
375
376      phy_font->max_strikes = new_max;
377    }
378
379    size1 = 1 + 1 + 1 + 2 + 2 + 1;
380    if ( flags0 & PFR_STRIKE_2BYTE_XPPM )
381      size1++;
382
383    if ( flags0 & PFR_STRIKE_2BYTE_YPPM )
384      size1++;
385
386    if ( flags0 & PFR_STRIKE_3BYTE_SIZE )
387      size1++;
388
389    if ( flags0 & PFR_STRIKE_3BYTE_OFFSET )
390      size1++;
391
392    if ( flags0 & PFR_STRIKE_2BYTE_COUNT )
393      size1++;
394
395    strike = phy_font->strikes + phy_font->num_strikes;
396
397    PFR_CHECK( count * size1 );
398
399    for ( n = 0; n < count; n++, strike++ )
400    {
401      strike->x_ppm       = ( flags0 & PFR_STRIKE_2BYTE_XPPM )
402                            ? PFR_NEXT_USHORT( p )
403                            : PFR_NEXT_BYTE( p );
404
405      strike->y_ppm       = ( flags0 & PFR_STRIKE_2BYTE_YPPM )
406                            ? PFR_NEXT_USHORT( p )
407                            : PFR_NEXT_BYTE( p );
408
409      strike->flags       = PFR_NEXT_BYTE( p );
410
411      strike->bct_size    = ( flags0 & PFR_STRIKE_3BYTE_SIZE )
412                            ? PFR_NEXT_ULONG( p )
413                            : PFR_NEXT_USHORT( p );
414
415      strike->bct_offset  = ( flags0 & PFR_STRIKE_3BYTE_OFFSET )
416                            ? PFR_NEXT_ULONG( p )
417                            : PFR_NEXT_USHORT( p );
418
419      strike->num_bitmaps = ( flags0 & PFR_STRIKE_2BYTE_COUNT )
420                            ? PFR_NEXT_USHORT( p )
421                            : PFR_NEXT_BYTE( p );
422    }
423
424    phy_font->num_strikes += count;
425
426  Exit:
427    return error;
428
429  Too_Short:
430    error = PFR_Err_Invalid_Table;
431    FT_ERROR(( "pfr_extra_item_load_bitmap_info:"
432               " invalid bitmap info table\n" ));
433    goto Exit;
434  }
435
436
437  /* Load font ID.  This is a so-called "unique" name that is rather
438   * long and descriptive (like "Tiresias ScreenFont v7.51").
439   *
440   * Note that a PFR font's family name is contained in an *undocumented*
441   * string of the "auxiliary data" portion of a physical font record.  This
442   * may also contain the "real" style name!
443   *
444   * If no family name is present, the font ID is used instead for the
445   * family.
446   */
447  FT_CALLBACK_DEF( FT_Error )
448  pfr_extra_item_load_font_id( FT_Byte*     p,
449                               FT_Byte*     limit,
450                               PFR_PhyFont  phy_font )
451  {
452    FT_Error    error  = PFR_Err_Ok;
453    FT_Memory   memory = phy_font->memory;
454    FT_PtrDist  len    = limit - p;
455
456
457    if ( phy_font->font_id != NULL )
458      goto Exit;
459
460    if ( FT_ALLOC( phy_font->font_id, len + 1 ) )
461      goto Exit;
462
463    /* copy font ID name, and terminate it for safety */
464    FT_MEM_COPY( phy_font->font_id, p, len );
465    phy_font->font_id[len] = 0;
466
467  Exit:
468    return error;
469  }
470
471
472  /* load stem snap tables */
473  FT_CALLBACK_DEF( FT_Error )
474  pfr_extra_item_load_stem_snaps( FT_Byte*     p,
475                                  FT_Byte*     limit,
476                                  PFR_PhyFont  phy_font )
477  {
478    FT_UInt    count, num_vert, num_horz;
479    FT_Int*    snaps  = NULL;
480    FT_Error   error  = PFR_Err_Ok;
481    FT_Memory  memory = phy_font->memory;
482
483
484    if ( phy_font->vertical.stem_snaps != NULL )
485      goto Exit;
486
487    PFR_CHECK( 1 );
488    count = PFR_NEXT_BYTE( p );
489
490    num_vert = count & 15;
491    num_horz = count >> 4;
492    count    = num_vert + num_horz;
493
494    PFR_CHECK( count * 2 );
495
496    if ( FT_NEW_ARRAY( snaps, count ) )
497      goto Exit;
498
499    phy_font->vertical.stem_snaps = snaps;
500    phy_font->horizontal.stem_snaps = snaps + num_vert;
501
502    for ( ; count > 0; count--, snaps++ )
503      *snaps = FT_NEXT_SHORT( p );
504
505  Exit:
506    return error;
507
508  Too_Short:
509    error = PFR_Err_Invalid_Table;
510    FT_ERROR(( "pfr_exta_item_load_stem_snaps:"
511               " invalid stem snaps table\n" ));
512    goto Exit;
513  }
514
515
516
517  /* load kerning pair data */
518  FT_CALLBACK_DEF( FT_Error )
519  pfr_extra_item_load_kerning_pairs( FT_Byte*     p,
520                                     FT_Byte*     limit,
521                                     PFR_PhyFont  phy_font )
522  {
523    PFR_KernItem  item   = NULL;
524    FT_Error      error  = PFR_Err_Ok;
525    FT_Memory     memory = phy_font->memory;
526
527
528    FT_TRACE2(( "pfr_extra_item_load_kerning_pairs()\n" ));
529
530    if ( FT_NEW( item ) )
531      goto Exit;
532
533    PFR_CHECK( 4 );
534
535    item->pair_count = PFR_NEXT_BYTE( p );
536    item->base_adj   = PFR_NEXT_SHORT( p );
537    item->flags      = PFR_NEXT_BYTE( p );
538    item->offset     = phy_font->offset + ( p - phy_font->cursor );
539
540#ifndef PFR_CONFIG_NO_CHECKS
541    item->pair_size = 3;
542
543    if ( item->flags & PFR_KERN_2BYTE_CHAR )
544      item->pair_size += 2;
545
546    if ( item->flags & PFR_KERN_2BYTE_ADJ )
547      item->pair_size += 1;
548
549    PFR_CHECK( item->pair_count * item->pair_size );
550#endif
551
552    /* load first and last pairs into the item to speed up */
553    /* lookup later...                                     */
554    if ( item->pair_count > 0 )
555    {
556      FT_UInt   char1, char2;
557      FT_Byte*  q;
558
559
560      if ( item->flags & PFR_KERN_2BYTE_CHAR )
561      {
562        q     = p;
563        char1 = PFR_NEXT_USHORT( q );
564        char2 = PFR_NEXT_USHORT( q );
565
566        item->pair1 = PFR_KERN_INDEX( char1, char2 );
567
568        q = p + item->pair_size * ( item->pair_count - 1 );
569        char1 = PFR_NEXT_USHORT( q );
570        char2 = PFR_NEXT_USHORT( q );
571
572        item->pair2 = PFR_KERN_INDEX( char1, char2 );
573      }
574      else
575      {
576        q     = p;
577        char1 = PFR_NEXT_BYTE( q );
578        char2 = PFR_NEXT_BYTE( q );
579
580        item->pair1 = PFR_KERN_INDEX( char1, char2 );
581
582        q = p + item->pair_size * ( item->pair_count - 1 );
583        char1 = PFR_NEXT_BYTE( q );
584        char2 = PFR_NEXT_BYTE( q );
585
586        item->pair2 = PFR_KERN_INDEX( char1, char2 );
587      }
588
589      /* add new item to the current list */
590      item->next                 = NULL;
591      *phy_font->kern_items_tail = item;
592      phy_font->kern_items_tail  = &item->next;
593      phy_font->num_kern_pairs  += item->pair_count;
594    }
595    else
596    {
597      /* empty item! */
598      FT_FREE( item );
599    }
600
601  Exit:
602    return error;
603
604  Too_Short:
605    FT_FREE( item );
606
607    error = PFR_Err_Invalid_Table;
608    FT_ERROR(( "pfr_extra_item_load_kerning_pairs:"
609               " invalid kerning pairs table\n" ));
610    goto Exit;
611  }
612
613
614
615  static const PFR_ExtraItemRec  pfr_phy_font_extra_items[] =
616  {
617    { 1, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_bitmap_info },
618    { 2, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_font_id },
619    { 3, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_stem_snaps },
620    { 4, (PFR_ExtraItem_ParseFunc)pfr_extra_item_load_kerning_pairs },
621    { 0, NULL }
622  };
623
624
625  /* Loads a name from the auxiliary data.  Since this extracts undocumented
626   * strings from the font file, we need to be careful here.
627   */
628  static FT_Error
629  pfr_aux_name_load( FT_Byte*     p,
630                     FT_UInt      len,
631                     FT_Memory    memory,
632                     FT_String*  *astring )
633  {
634    FT_Error    error = PFR_Err_Ok;
635    FT_String*  result = NULL;
636    FT_UInt     n, ok;
637
638
639    if ( len > 0 && p[len - 1] == 0 )
640      len--;
641
642    /* check that each character is ASCII for making sure not to
643       load garbage
644     */
645    ok = ( len > 0 );
646    for ( n = 0; n < len; n++ )
647      if ( p[n] < 32 || p[n] > 127 )
648      {
649        ok = 0;
650        break;
651      }
652
653    if ( ok )
654    {
655      if ( FT_ALLOC( result, len + 1 ) )
656        goto Exit;
657
658      FT_MEM_COPY( result, p, len );
659      result[len] = 0;
660    }
661  Exit:
662    *astring = result;
663    return error;
664  }
665
666
667  FT_LOCAL_DEF( void )
668  pfr_phy_font_done( PFR_PhyFont  phy_font,
669                     FT_Memory    memory )
670  {
671    FT_FREE( phy_font->font_id );
672    FT_FREE( phy_font->family_name );
673    FT_FREE( phy_font->style_name );
674
675    FT_FREE( phy_font->vertical.stem_snaps );
676    phy_font->vertical.num_stem_snaps = 0;
677
678    phy_font->horizontal.stem_snaps     = NULL;
679    phy_font->horizontal.num_stem_snaps = 0;
680
681    FT_FREE( phy_font->strikes );
682    phy_font->num_strikes = 0;
683    phy_font->max_strikes = 0;
684
685    FT_FREE( phy_font->chars );
686    phy_font->num_chars    = 0;
687    phy_font->chars_offset = 0;
688
689    FT_FREE( phy_font->blue_values );
690    phy_font->num_blue_values = 0;
691
692    {
693      PFR_KernItem  item, next;
694
695
696      item = phy_font->kern_items;
697      while ( item )
698      {
699        next = item->next;
700        FT_FREE( item );
701        item = next;
702      }
703      phy_font->kern_items      = NULL;
704      phy_font->kern_items_tail = NULL;
705    }
706
707    phy_font->num_kern_pairs = 0;
708  }
709
710
711  FT_LOCAL_DEF( FT_Error )
712  pfr_phy_font_load( PFR_PhyFont  phy_font,
713                     FT_Stream    stream,
714                     FT_UInt32    offset,
715                     FT_UInt32    size )
716  {
717    FT_Error   error;
718    FT_Memory  memory = stream->memory;
719    FT_UInt    flags;
720    FT_ULong   num_aux;
721    FT_Byte*   p;
722    FT_Byte*   limit;
723
724
725    phy_font->memory = memory;
726    phy_font->offset = offset;
727
728    phy_font->kern_items      = NULL;
729    phy_font->kern_items_tail = &phy_font->kern_items;
730
731    if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( size ) )
732      goto Exit;
733
734    phy_font->cursor = stream->cursor;
735
736    p     = stream->cursor;
737    limit = p + size;
738
739    PFR_CHECK( 15 );
740    phy_font->font_ref_number    = PFR_NEXT_USHORT( p );
741    phy_font->outline_resolution = PFR_NEXT_USHORT( p );
742    phy_font->metrics_resolution = PFR_NEXT_USHORT( p );
743    phy_font->bbox.xMin          = PFR_NEXT_SHORT( p );
744    phy_font->bbox.yMin          = PFR_NEXT_SHORT( p );
745    phy_font->bbox.xMax          = PFR_NEXT_SHORT( p );
746    phy_font->bbox.yMax          = PFR_NEXT_SHORT( p );
747    phy_font->flags      = flags = PFR_NEXT_BYTE( p );
748
749    /* get the standard advance for non-proportional fonts */
750    if ( !(flags & PFR_PHY_PROPORTIONAL) )
751    {
752      PFR_CHECK( 2 );
753      phy_font->standard_advance = PFR_NEXT_SHORT( p );
754    }
755
756    /* load the extra items when present */
757    if ( flags & PFR_PHY_EXTRA_ITEMS )
758    {
759      error =  pfr_extra_items_parse( &p, limit,
760                                      pfr_phy_font_extra_items, phy_font );
761
762      if ( error )
763        goto Fail;
764    }
765
766    /* In certain fonts, the auxiliary bytes contain interesting  */
767    /* information. These are not in the specification but can be */
768    /* guessed by looking at the content of a few PFR0 fonts.     */
769    PFR_CHECK( 3 );
770    num_aux = PFR_NEXT_ULONG( p );
771
772    if ( num_aux > 0 )
773    {
774      FT_Byte*  q = p;
775      FT_Byte*  q2;
776
777
778      PFR_CHECK( num_aux );
779      p += num_aux;
780
781      while ( num_aux > 0 )
782      {
783        FT_UInt  length, type;
784
785
786        if ( q + 4 > p )
787          break;
788
789        length = PFR_NEXT_USHORT( q );
790        if ( length < 4 || length > num_aux )
791          break;
792
793        q2   = q + length - 2;
794        type = PFR_NEXT_USHORT( q );
795
796        switch ( type )
797        {
798        case 1:
799          /* this seems to correspond to the font's family name,
800           * padded to 16-bits with one zero when necessary
801           */
802          error = pfr_aux_name_load( q, length - 4U, memory,
803                                     &phy_font->family_name );
804          if ( error )
805            goto Exit;
806          break;
807
808        case 2:
809          if ( q + 32 > q2 )
810            break;
811
812          q += 10;
813          phy_font->ascent  = PFR_NEXT_SHORT( q );
814          phy_font->descent = PFR_NEXT_SHORT( q );
815          phy_font->leading = PFR_NEXT_SHORT( q );
816          q += 16;
817          break;
818
819        case 3:
820          /* this seems to correspond to the font's style name,
821           * padded to 16-bits with one zero when necessary
822           */
823          error = pfr_aux_name_load( q, length - 4U, memory,
824                                     &phy_font->style_name );
825          if ( error )
826            goto Exit;
827          break;
828
829        default:
830          ;
831        }
832
833        q        = q2;
834        num_aux -= length;
835      }
836    }
837
838    /* read the blue values */
839    {
840      FT_UInt  n, count;
841
842
843      PFR_CHECK( 1 );
844      phy_font->num_blue_values = count = PFR_NEXT_BYTE( p );
845
846      PFR_CHECK( count * 2 );
847
848      if ( FT_NEW_ARRAY( phy_font->blue_values, count ) )
849        goto Fail;
850
851      for ( n = 0; n < count; n++ )
852        phy_font->blue_values[n] = PFR_NEXT_SHORT( p );
853    }
854
855    PFR_CHECK( 8 );
856    phy_font->blue_fuzz  = PFR_NEXT_BYTE( p );
857    phy_font->blue_scale = PFR_NEXT_BYTE( p );
858
859    phy_font->vertical.standard   = PFR_NEXT_USHORT( p );
860    phy_font->horizontal.standard = PFR_NEXT_USHORT( p );
861
862    /* read the character descriptors */
863    {
864      FT_UInt  n, count, Size;
865
866
867      phy_font->num_chars    = count = PFR_NEXT_USHORT( p );
868      phy_font->chars_offset = offset + ( p - stream->cursor );
869
870      if ( FT_NEW_ARRAY( phy_font->chars, count ) )
871        goto Fail;
872
873      Size = 1 + 1 + 2;
874      if ( flags & PFR_PHY_2BYTE_CHARCODE )
875        Size += 1;
876
877      if ( flags & PFR_PHY_PROPORTIONAL )
878        Size += 2;
879
880      if ( flags & PFR_PHY_ASCII_CODE )
881        Size += 1;
882
883      if ( flags & PFR_PHY_2BYTE_GPS_SIZE )
884        Size += 1;
885
886      if ( flags & PFR_PHY_3BYTE_GPS_OFFSET )
887        Size += 1;
888
889      PFR_CHECK( count * Size );
890
891      for ( n = 0; n < count; n++ )
892      {
893        PFR_Char  cur = &phy_font->chars[n];
894
895
896        cur->char_code = ( flags & PFR_PHY_2BYTE_CHARCODE )
897                         ? PFR_NEXT_USHORT( p )
898                         : PFR_NEXT_BYTE( p );
899
900        cur->advance   = ( flags & PFR_PHY_PROPORTIONAL )
901                         ? PFR_NEXT_SHORT( p )
902                         : (FT_Int) phy_font->standard_advance;
903
904#if 0
905        cur->ascii     = ( flags & PFR_PHY_ASCII_CODE )
906                         ? PFR_NEXT_BYTE( p )
907                         : 0;
908#else
909        if ( flags & PFR_PHY_ASCII_CODE )
910          p += 1;
911#endif
912        cur->gps_size  = ( flags & PFR_PHY_2BYTE_GPS_SIZE )
913                         ? PFR_NEXT_USHORT( p )
914                         : PFR_NEXT_BYTE( p );
915
916        cur->gps_offset = ( flags & PFR_PHY_3BYTE_GPS_OFFSET )
917                          ? PFR_NEXT_ULONG( p )
918                          : PFR_NEXT_USHORT( p );
919      }
920    }
921
922    /* that's it! */
923
924  Fail:
925    FT_FRAME_EXIT();
926
927    /* save position of bitmap info */
928    phy_font->bct_offset = FT_STREAM_POS();
929    phy_font->cursor     = NULL;
930
931  Exit:
932    return error;
933
934  Too_Short:
935    error = PFR_Err_Invalid_Table;
936    FT_ERROR(( "pfr_phy_font_load: invalid physical font table\n" ));
937    goto Fail;
938  }
939
940
941/* END */