aboutsummaryrefslogtreecommitdiff
path: root/freetype/builds/unix/ftsystem.c
blob: 312a0586b66783c49ff1301692f77351271e6bed (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
/***************************************************************************/
/*                                                                         */
/*  ftsystem.c                                                             */
/*                                                                         */
/*    Unix-specific FreeType low-level system interface (body).            */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2004, 2005, 2006, 2007, 2008 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>
  /* we use our special ftconfig.h file, not the standard one */
#include <ftconfig.h>
#include <freetype/internal/ftdebug.h>
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H
#include <freetype/internal/ftstream.h>

  /* memory-mapping includes and definitions */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <sys/mman.h>
#ifndef MAP_FILE
#define MAP_FILE  0x00
#endif

#ifdef MUNMAP_USES_VOIDP
#define MUNMAP_ARG_CAST  void *
#else
#define MUNMAP_ARG_CAST  char *
#endif

#ifdef NEED_MUNMAP_DECL

#ifdef __cplusplus
  extern "C"
#else
  extern
#endif
  int
  munmap( char*  addr,
          int    len );

#define MUNMAP_ARG_CAST  char *

#endif /* NEED_DECLARATION_MUNMAP */


#include <sys/types.h>
#include <sys/stat.h>

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>


  /*************************************************************************/
  /*                                                                       */
  /*                       MEMORY MANAGEMENT INTERFACE                     */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_alloc                                                           */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory allocation function.                                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A pointer to the memory object.                          */
  /*                                                                       */
  /*    size   :: The requested size in bytes.                             */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The address of newly allocated block.                              */
  /*                                                                       */
  FT_CALLBACK_DEF( void* )
  ft_alloc( FT_Memory  memory,
            long       size )
  {
    FT_UNUSED( memory );

    return malloc( size );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_realloc                                                         */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory reallocation function.                                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory   :: A pointer to the memory object.                        */
  /*                                                                       */
  /*    cur_size :: The current size of the allocated memory block.        */
  /*                                                                       */
  /*    new_size :: The newly requested size in bytes.                     */
  /*                                                                       */
  /*    block    :: The current address of the block in memory.            */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The address of the reallocated memory block.                       */
  /*                                                                       */
  FT_CALLBACK_DEF( void* )
  ft_realloc( FT_Memory  memory,
              long       cur_size,
              long       new_size,
              void*      block )
  {
    FT_UNUSED( memory );
    FT_UNUSED( cur_size );

    return realloc( block, new_size );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_free                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The memory release function.                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A pointer to the memory object.                          */
  /*                                                                       */
  /*    block  :: The address of block in memory to be freed.              */
  /*                                                                       */
  FT_CALLBACK_DEF( void )
  ft_free( FT_Memory  memory,
           void*      block )
  {
    FT_UNUSED( memory );

    free( block );
  }


  /*************************************************************************/
  /*                                                                       */
  /*                     RESOURCE MANAGEMENT INTERFACE                     */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* 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_io

  /* We use the macro STREAM_FILE for convenience to extract the       */
  /* system-specific stream handle from a given FreeType stream object */
#define STREAM_FILE( stream )  ( (FILE*)stream->descriptor.pointer )


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_close_stream_by_munmap                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The function to close a stream which is opened by mmap.            */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream :: A pointer to the stream object.                          */
  /*                                                                       */
  FT_CALLBACK_DEF( void )
  ft_close_stream_by_munmap( FT_Stream  stream )
  {
    munmap( (MUNMAP_ARG_CAST)stream->descriptor.pointer, stream->size );

    stream->descriptor.pointer = NULL;
    stream->size               = 0;
    stream->base               = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    ft_close_stream_by_free                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The function to close a stream which is created by ft_alloc.       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream :: A pointer to the stream object.                          */
  /*                                                                       */
  FT_CALLBACK_DEF( void )
  ft_close_stream_by_free( FT_Stream  stream )
  {
    ft_free( NULL, stream->descriptor.pointer );

    stream->descriptor.pointer = NULL;
    stream->size               = 0;
    stream->base               = 0;
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Error )
  FT_Stream_Open( FT_Stream    stream,
                  const char*  filepathname )
  {
    int          file;
    struct stat  stat_buf;


    if ( !stream )
      return FT_Err_Invalid_Stream_Handle;

    /* open the file */
    file = open( filepathname, O_RDONLY );
    if ( file < 0 )
    {
      FT_ERROR(( "FT_Stream_Open:" ));
      FT_ERROR(( " could not open `%s'\n", filepathname ));
      return FT_Err_Cannot_Open_Resource;
    }

    /* Here we ensure that a "fork" will _not_ duplicate   */
    /* our opened input streams on Unix.  This is critical */
    /* since it avoids some (possible) access control      */
    /* issues and cleans up the kernel file table a bit.   */
    /*                                                     */
#ifdef F_SETFD
#ifdef FD_CLOEXEC
    (void)fcntl( file, F_SETFD, FD_CLOEXEC );
#else
    (void)fcntl( file, F_SETFD, 1 );
#endif /* FD_CLOEXEC */
#endif /* F_SETFD */

    if ( fstat( file, &stat_buf ) < 0 )
    {
      FT_ERROR(( "FT_Stream_Open:" ));
      FT_ERROR(( " could not `fstat' file `%s'\n", filepathname ));
      goto Fail_Map;
    }

    /* XXX: TODO -- real 64bit platform support                        */
    /*                                                                 */
    /* `stream->size' is typedef'd to unsigned long (in                */
    /* freetype/ftsystem.h); `stat_buf.st_size', however, is usually   */
    /* typedef'd to off_t (in sys/stat.h).                             */
    /* On some platforms, the former is 32bit and the latter is 64bit. */
    /* To avoid overflow caused by fonts in huge files larger than     */
    /* 2GB, do a test.  Temporary fix proposed by Sean McBride.        */
    /*                                                                 */
    if ( stat_buf.st_size > LONG_MAX )
    {
      FT_ERROR(( "FT_Stream_Open: file is too big\n" ));
      goto Fail_Map;
    }
    else if ( stat_buf.st_size == 0 )
    {
      FT_ERROR(( "FT_Stream_Open: zero-length file\n" ));
      goto Fail_Map;
    }

    /* This cast potentially truncates a 64bit to 32bit! */
    stream->size = (unsigned long)stat_buf.st_size;
    stream->pos  = 0;
    stream->base = (unsigned char *)mmap( NULL,
                                          stream->size,
                                          PROT_READ,
                                          MAP_FILE | MAP_PRIVATE,
                                          file,
                                          0 );

    /* on some RTOS, mmap might return 0 */
    if ( (long)stream->base != -1 && stream->base != NULL )
      stream->close = ft_close_stream_by_munmap;
    else
    {
      ssize_t  total_read_count;


      FT_ERROR(( "FT_Stream_Open:" ));
      FT_ERROR(( " could not `mmap' file `%s'\n", filepathname ));

      stream->base = (unsigned char*)ft_alloc( NULL, stream->size );

      if ( !stream->base )
      {
        FT_ERROR(( "FT_Stream_Open:" ));
        FT_ERROR(( " could not `alloc' memory\n" ));
        goto Fail_Map;
      }

      total_read_count = 0;
      do {
        ssize_t  read_count;


        read_count = read( file,
                           stream->base + total_read_count,
                           stream->size - total_read_count );

        if ( read_count <= 0 )
        {
          if ( read_count == -1 && errno == EINTR )
            continue;

          FT_ERROR(( "FT_Stream_Open:" ));
          FT_ERROR(( " error while `read'ing file `%s'\n", filepathname ));
          goto Fail_Read;
        }

        total_read_count += read_count;

      } while ( (unsigned long)total_read_count != stream->size );

      stream->close = ft_close_stream_by_free;
    }

    close( file );

    stream->descriptor.pointer = stream->base;
    stream->pathname.pointer   = (char*)filepathname;

    stream->read = 0;

    FT_TRACE1(( "FT_Stream_Open:" ));
    FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",
                filepathname, stream->size ));

    return FT_Err_Ok;

  Fail_Read:
    ft_free( NULL, stream->base );

  Fail_Map:
    close( file );

    stream->base = NULL;
    stream->size = 0;
    stream->pos  = 0;

    return FT_Err_Cannot_Open_Stream;
  }


#ifdef FT_DEBUG_MEMORY

  extern FT_Int
  ft_mem_debug_init( FT_Memory  memory );

  extern void
  ft_mem_debug_done( FT_Memory  memory );

#endif


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Memory )
  FT_New_Memory( void )
  {
    FT_Memory  memory;


    memory = (FT_Memory)malloc( sizeof ( *memory ) );
    if ( memory )
    {
      memory->user    = 0;
      memory->alloc   = ft_alloc;
      memory->realloc = ft_realloc;
      memory->free    = ft_free;
#ifdef FT_DEBUG_MEMORY
      ft_mem_debug_init( memory );
#endif
    }

    return memory;
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( void )
  FT_Done_Memory( FT_Memory  memory )
  {
#ifdef FT_DEBUG_MEMORY
    ft_mem_debug_done( memory );
#endif
    memory->free( memory, memory );
  }


/* END */