summaryrefslogtreecommitdiff
path: root/src/freetype2/base/ftutil.c
blob: 5f77be557ad0eb9aa947058b09bf8b80ccdbc94a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
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
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
/***************************************************************************/
/*                                                                         */
/*  ftutil.c                                                               */
/*                                                                         */
/*    FreeType utility file for memory and list management (body).         */
/*                                                                         */
/*  Copyright 2002, 2004, 2005, 2006, 2007 by                              */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_OBJECTS_H
#include FT_LIST_H


  /*************************************************************************/
  /*                                                                       */
  /* 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_memory


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                                                               *****/
  /*****               M E M O R Y   M A N A G E M E N T               *****/
  /*****                                                               *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  FT_BASE_DEF( FT_Pointer )
  ft_mem_alloc( FT_Memory  memory,
                FT_Long    size,
                FT_Error  *p_error )
  {
    FT_Error    error;
    FT_Pointer  block = ft_mem_qalloc( memory, size, &error );

    if ( !error && size > 0 )
      FT_MEM_ZERO( block, size );

    *p_error = error;
    return block;
  }


  FT_BASE_DEF( FT_Pointer )
  ft_mem_qalloc( FT_Memory  memory,
                 FT_Long    size,
                 FT_Error  *p_error )
  {
    FT_Error    error = FT_Err_Ok;
    FT_Pointer  block = NULL;


    if ( size > 0 )
    {
      block = memory->alloc( memory, size );
      if ( block == NULL )
        error = FT_Err_Out_Of_Memory;
    }
    else if ( size < 0 )
    {
      /* may help catch/prevent security issues */
      error = FT_Err_Invalid_Argument;
    }

    *p_error = error;
    return block;
  }


  FT_BASE_DEF( FT_Pointer )
  ft_mem_realloc( FT_Memory  memory,
                  FT_Long    item_size,
                  FT_Long    cur_count,
                  FT_Long    new_count,
                  void*      block,
                  FT_Error  *p_error )
  {
    FT_Error  error = FT_Err_Ok;

    block = ft_mem_qrealloc( memory, item_size,
                             cur_count, new_count, block, &error );
    if ( !error && new_count > cur_count )
      FT_MEM_ZERO( (char*)block + cur_count * item_size,
                   ( new_count - cur_count ) * item_size );

    *p_error = error;
    return block;
  }


  FT_BASE_DEF( FT_Pointer )
  ft_mem_qrealloc( FT_Memory  memory,
                   FT_Long    item_size,
                   FT_Long    cur_count,
                   FT_Long    new_count,
                   void*      block,
                   FT_Error  *p_error )
  {
    FT_Error  error = FT_Err_Ok;


    /* Note that we now accept `item_size == 0' as a valid parameter, in
     * order to cover very weird cases where an ALLOC_MULT macro would be
     * called.
     */
    if ( cur_count < 0 || new_count < 0 || item_size < 0 )
    {
      /* may help catch/prevent nasty security issues */
      error = FT_Err_Invalid_Argument;
    }
    else if ( new_count == 0 || item_size == 0 )
    {
      ft_mem_free( memory, block );
      block = NULL;
    }
    else if ( new_count > FT_INT_MAX/item_size )
    {
      error = FT_Err_Array_Too_Large;
    }
    else if ( cur_count == 0 )
    {
      FT_ASSERT( block == NULL );

      block = ft_mem_alloc( memory, new_count*item_size, &error );
    }
    else
    {
      FT_Pointer  block2;
      FT_Long     cur_size = cur_count*item_size;
      FT_Long     new_size = new_count*item_size;


      block2 = memory->realloc( memory, cur_size, new_size, block );
      if ( block2 == NULL )
        error = FT_Err_Out_Of_Memory;
      else
        block = block2;
    }

    *p_error = error;
    return block;
  }


  FT_BASE_DEF( void )
  ft_mem_free( FT_Memory   memory,
               const void *P )
  {
    if ( P )
      memory->free( memory, (void*)P );
  }


  FT_BASE_DEF( FT_Pointer )
  ft_mem_dup( FT_Memory    memory,
              const void*  address,
              FT_ULong     size,
              FT_Error    *p_error )
  {
    FT_Error    error;
    FT_Pointer  p = ft_mem_qalloc( memory, size, &error );


    if ( !error && address )
      ft_memcpy( p, address, size );

    *p_error = error;
    return p;
  }


  FT_BASE_DEF( FT_Pointer )
  ft_mem_strdup( FT_Memory    memory,
                 const char*  str,
                 FT_Error    *p_error )
  {
    FT_ULong  len = str ? (FT_ULong)ft_strlen( str ) + 1
                        : 0;


    return ft_mem_dup( memory, str, len, p_error );
  }


  FT_BASE_DEF( FT_Int )
  ft_mem_strcpyn( char*        dst,
                  const char*  src,
                  FT_ULong     size )
  {
    while ( size > 1 && *src != 0 )
    {
      *dst++ = *src++;
      size--;
    }

    *dst = 0;  /* always zero-terminate */

    return *src != 0;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                                                               *****/
  /*****            D O U B L Y   L I N K E D   L I S T S              *****/
  /*****                                                               *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_list

  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( FT_ListNode )
  FT_List_Find( FT_List  list,
                void*    data )
  {
    FT_ListNode  cur;


    cur = list->head;
    while ( cur )
    {
      if ( cur->data == data )
        return cur;

      cur = cur->next;
    }

    return (FT_ListNode)0;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( void )
  FT_List_Add( FT_List      list,
               FT_ListNode  node )
  {
    FT_ListNode  before = list->tail;


    node->next = 0;
    node->prev = before;

    if ( before )
      before->next = node;
    else
      list->head = node;

    list->tail = node;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( void )
  FT_List_Insert( FT_List      list,
                  FT_ListNode  node )
  {
    FT_ListNode  after = list->head;


    node->next = after;
    node->prev = 0;

    if ( !after )
      list->tail = node;
    else
      after->prev = node;

    list->head = node;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( void )
  FT_List_Remove( FT_List      list,
                  FT_ListNode  node )
  {
    FT_ListNode  before, after;


    before = node->prev;
    after  = node->next;

    if ( before )
      before->next = after;
    else
      list->head = after;

    if ( after )
      after->prev = before;
    else
      list->tail = before;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( void )
  FT_List_Up( FT_List      list,
              FT_ListNode  node )
  {
    FT_ListNode  before, after;


    before = node->prev;
    after  = node->next;

    /* check whether we are already on top of the list */
    if ( !before )
      return;

    before->next = after;

    if ( after )
      after->prev = before;
    else
      list->tail = before;

    node->prev       = 0;
    node->next       = list->head;
    list->head->prev = node;
    list->head       = node;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( FT_Error )
  FT_List_Iterate( FT_List            list,
                   FT_List_Iterator   iterator,
                   void*              user )
  {
    FT_ListNode  cur   = list->head;
    FT_Error     error = FT_Err_Ok;


    while ( cur )
    {
      FT_ListNode  next = cur->next;


      error = iterator( cur, user );
      if ( error )
        break;

      cur = next;
    }

    return error;
  }


  /* documentation is in ftlist.h */

  FT_EXPORT_DEF( void )
  FT_List_Finalize( FT_List             list,
                    FT_List_Destructor  destroy,
                    FT_Memory           memory,
                    void*               user )
  {
    FT_ListNode  cur;


    cur = list->head;
    while ( cur )
    {
      FT_ListNode  next = cur->next;
      void*        data = cur->data;


      if ( destroy )
        destroy( memory, data, user );

      FT_FREE( cur );
      cur = next;
    }

    list->head = 0;
    list->tail = 0;
  }


  FT_BASE_DEF( FT_UInt32 )
  ft_highpow2( FT_UInt32  value )
  {
    FT_UInt32  value2;


    /*
     *  We simply clear the lowest bit in each iteration.  When
     *  we reach 0, we know that the previous value was our result.
     */
    for ( ;; )
    {
      value2 = value & (value - 1);  /* clear lowest bit */
      if ( value2 == 0 )
        break;

      value = value2;
    }
    return value;
  }


#ifdef FT_CONFIG_OPTION_OLD_INTERNALS

  FT_BASE_DEF( FT_Error )
  FT_Alloc( FT_Memory  memory,
            FT_Long    size,
            void*     *P )
  {
    FT_Error  error;


    (void)FT_ALLOC( *P, size );
    return error;
  }


  FT_BASE_DEF( FT_Error )
  FT_QAlloc( FT_Memory  memory,
             FT_Long    size,
             void*     *p )
  {
    FT_Error  error;


    (void)FT_QALLOC( *p, size );
    return error;
  }


  FT_BASE_DEF( FT_Error )
  FT_Realloc( FT_Memory  memory,
              FT_Long    current,
              FT_Long    size,
              void*     *P )
  {
    FT_Error  error;


    (void)FT_REALLOC( *P, current, size );
    return error;
  }


  FT_BASE_DEF( FT_Error )
  FT_QRealloc( FT_Memory  memory,
               FT_Long    current,
               FT_Long    size,
               void*     *p )
  {
    FT_Error  error;


    (void)FT_QREALLOC( *p, current, size );
    return error;
  }


  FT_BASE_DEF( void )
  FT_Free( FT_Memory  memory,
           void*     *P )
  {
    if ( *P )
      FT_MEM_FREE( *P );
  }

#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */

/* END */