forked from Unidata/netcdf-c
-
Notifications
You must be signed in to change notification settings - Fork 0
/
winceio.c
736 lines (605 loc) · 14.1 KB
/
winceio.c
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
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
/*
* Copyright 1996, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
/* $Id: winceio.c,v 1.2 2010/05/04 17:30:04 dmh Exp $ */
/* Dennis Heimbigner 2010-3-04 */
#include <config.h>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h> /* DEBUG */
#ifndef _WIN32_WCE
#include <errno.h>
#else
#define EPERM NC_EPERM
#define ENOMEM NC_ENOMEM
#define EINVAL NC_EINVAL
#define EIO NC_EINVAL
#define EEXIST NC_EEXIST
#endif
#ifndef ENOERR
#define ENOERR 0
#endif
#include <string.h>
#include <stdio.h>
#include "ncio.h"
#include "fbits.h"
#include "rnd.h"
#if !defined(NDEBUG) && !defined(X_INT_MAX)
#define X_INT_MAX 2147483647
#endif
#if 0 /* !defined(NDEBUG) && !defined(X_ALIGN) */
#define X_ALIGN 4
#endif
#define ALWAYS_NC_SHARE 0 /* DEBUG */
#define DEFAULTBLKSIZE 32768
static FILE* descriptors[1024];
static int fdmax = 1; /* never use zero */
/* Begin OS */
/*
* What is the preferred I/O block size?
* (This becomes the default *sizehint == ncp->chunk in the higher layers.)
* TODO: What is the the best answer here?
*/
static size_t
blksize(int fd)
{
return (size_t) DEFAULTBLKSIZE;
}
/*
* Sortof like ftruncate, except won't make the
* file shorter.
*/
static int
fgrow(FILE* f, const off_t len)
{
int status = ENOERR;
long pos = ftell(f);
long size;
pos = ftell(f);
status = fseek(f,0,SEEK_END);
if(ferror(f)) return EIO;
size = ftell(f);
status = fseek(f,pos,SEEK_SET);
if(ferror(f)) return EIO;
if(len < size) return ENOERR;
else {
const long dumb = 0;
status = fseek(f, len-sizeof(dumb), SEEK_SET);
if(ferror(f)) return EIO;
fwrite((const void *)&dumb, 1, sizeof(dumb), f);
if(ferror(f)) return EIO;
status = fseek(f, pos, SEEK_SET);
if(ferror(f)) return EIO;
}
return ENOERR;
}
/*
* Sortof like ftruncate, except won't make the file shorter. Differs
* from fgrow by only writing one byte at designated seek position, if
* needed.
*/
static int
fgrow2(FILE* f, const off_t len)
{
int status = ENOERR;
long pos = ftell(f);
long size;
pos = ftell(f);
status = fseek(f,0,SEEK_END);
if(ferror(f)) return EIO;
size = ftell(f);
status = fseek(f,pos,SEEK_SET);
if(ferror(f)) return EIO;
if(len < size) return ENOERR;
else {
const char dumb = 0;
status = fseek(f, len-sizeof(dumb), SEEK_SET);
if(ferror(f)) return EIO;
fwrite((const void *)&dumb, 1, sizeof(dumb), f);
if(ferror(f)) return EIO;
status = fseek(f, pos, SEEK_SET);
if(ferror(f)) return EIO;
}
return ENOERR;
}
/* End OS */
/* Begin ffio */
static int
fileio_pgout(ncio *const nciop,
off_t const offset, const size_t extent,
const void *const vp, off_t *posp)
{
int status = ENOERR;
FILE* f = descriptors[nciop->fd];
#ifdef X_ALIGN
assert(offset % X_ALIGN == 0);
assert(extent % X_ALIGN == 0);
#endif
if(*posp != offset)
{
status = fseek(f, offset, SEEK_SET);
if(ferror(f)) return EIO;
*posp = offset;
}
fwrite(vp,1,extent,f);
if(ferror(f)) return EIO;
*posp += extent;
return ENOERR;
}
static int
fileio_pgin(ncio *const nciop,
off_t const offset, const size_t extent,
void *const vp, size_t *nreadp, off_t *posp)
{
int status = ENOERR;
ssize_t nread;
int count;
FILE* f = descriptors[nciop->fd];
#ifdef X_ALIGN
assert(offset % X_ALIGN == 0);
assert(extent % X_ALIGN == 0);
#endif
if(*posp != offset)
{
status = fseek(f, offset, SEEK_SET);
if(ferror(f)) return EIO;
*posp = offset;
}
nread = fread(vp,1,extent,f);
if(ferror(f)) return EIO;
*nreadp = nread;
*posp += nread;
return ENOERR;
}
/* */
typedef struct ncio_ffio {
off_t pos;
/* buffer */
off_t bf_offset;
size_t bf_extent;
size_t bf_cnt;
void *bf_base;
} ncio_ffio;
static int
ncio_fileio_rel(ncio *const nciop, off_t offset, int rflags)
{
int status = ENOERR;
FILE* f = descriptors[nciop->fd];
ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
assert(ffp->bf_offset <= offset);
assert(ffp->bf_cnt != 0);
assert(ffp->bf_cnt <= ffp->bf_extent);
#ifdef X_ALIGN
assert(offset < ffp->bf_offset + X_ALIGN);
assert(ffp->bf_cnt % X_ALIGN == 0 );
#endif
if(fIsSet(rflags, RGN_MODIFIED))
{
if(!fIsSet(nciop->ioflags, NC_WRITE))
return EPERM; /* attempt to write readonly file */
status = fileio_pgout(nciop, ffp->bf_offset,
ffp->bf_cnt,
ffp->bf_base, &ffp->pos);
/* if error, invalidate buffer anyway */
}
ffp->bf_offset = OFF_NONE;
ffp->bf_cnt = 0;
return status;
}
static int
ncio_fileio_get(ncio *const nciop,
off_t offset, size_t extent,
int rflags,
void **const vpp)
{
ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
int status = ENOERR;
FILE* f = descriptors[nciop->fd];
#ifdef X_ALIGN
size_t rem;
#endif
if(fIsSet(rflags, RGN_WRITE) && !fIsSet(nciop->ioflags, NC_WRITE))
return EPERM; /* attempt to write readonly file */
assert(extent != 0);
assert(extent < X_INT_MAX); /* sanity check */
assert(ffp->bf_cnt == 0);
#ifdef X_ALIGN
/* round to seekable boundaries */
rem = offset % X_ALIGN;
if(rem != 0)
{
offset -= rem;
extent += rem;
}
{
const size_t rndup = extent % X_ALIGN;
if(rndup != 0)
extent += X_ALIGN - rndup;
}
assert(offset % X_ALIGN == 0);
assert(extent % X_ALIGN == 0);
#endif
if(ffp->bf_extent < extent)
{
if(ffp->bf_base != NULL)
{
free(ffp->bf_base);
ffp->bf_base = NULL;
ffp->bf_extent = 0;
}
assert(ffp->bf_extent == 0);
ffp->bf_base = malloc(extent);
if(ffp->bf_base == NULL)
return ENOMEM;
ffp->bf_extent = extent;
}
status = fileio_pgin(nciop, offset,
extent,
ffp->bf_base,
&ffp->bf_cnt, &ffp->pos);
if(status != ENOERR)
return status;
ffp->bf_offset = offset;
if(ffp->bf_cnt < extent)
{
(void) memset((char *)ffp->bf_base + ffp->bf_cnt, 0,
extent - ffp->bf_cnt);
ffp->bf_cnt = extent;
}
#ifdef X_ALIGN
*vpp = (char *)ffp->bf_base + rem;
#else
*vpp = (char *)ffp->bf_base;
#endif
return ENOERR;
}
static int
ncio_fileio_move(ncio *const nciop, off_t to, off_t from,
size_t nbytes, int rflags)
{
int status = ENOERR;
off_t lower = from;
off_t upper = to;
char *base;
size_t diff = upper - lower;
size_t extent = diff + nbytes;
FILE* f = descriptors[nciop->fd];
rflags &= RGN_NOLOCK; /* filter unwanted flags */
if(to == from)
return ENOERR; /* NOOP */
if(to > from)
{
/* growing */
lower = from;
upper = to;
}
else
{
/* shrinking */
lower = to;
upper = from;
}
diff = upper - lower;
extent = diff + nbytes;
status = ncio_fileio_get(nciop, lower, extent, RGN_WRITE|rflags,
(void **)&base);
if(status != ENOERR)
return status;
if(to > from)
(void) memmove(base + diff, base, nbytes);
else
(void) memmove(base, base + diff, nbytes);
(void) ncio_fileio_rel(nciop, lower, RGN_MODIFIED);
return status;
}
static int
ncio_fileio_sync(ncio *const nciop)
{
FILE* f = descriptors[nciop->fd];
fflush(f);
return ENOERR;
}
static void
ncio_fileio_free(void *const pvt)
{
ncio_ffio *ffp = (ncio_ffio *)pvt;
if(ffp == NULL)
return;
if(ffp->bf_base != NULL)
{
free(ffp->bf_base);
ffp->bf_base = NULL;
ffp->bf_offset = OFF_NONE;
ffp->bf_extent = 0;
ffp->bf_cnt = 0;
}
}
static int
ncio_fileio_init2(ncio *const nciop, size_t *sizehintp)
{
FILE* f = descriptors[nciop->fd];
ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
assert(f != NULL);
ffp->bf_extent = *sizehintp;
assert(ffp->bf_base == NULL);
/* this is separate allocation because it may grow */
ffp->bf_base = malloc(ffp->bf_extent);
if(ffp->bf_base == NULL)
{
ffp->bf_extent = 0;
return ENOMEM;
}
/* else */
return ENOERR;
}
static void
ncio_fileio_init(ncio *const nciop)
{
ncio_ffio *ffp = (ncio_ffio *)nciop->pvt;
p
*((ncio_relfunc **)&nciop->rel) = ncio_fileio_rel; /* cast away const */
*((ncio_getfunc **)&nciop->get) = ncio_fileio_get; /* cast away const */
*((ncio_movefunc **)&nciop->move) = ncio_fileio_move; /* cast away const */
*((ncio_syncfunc **)&nciop->sync) = ncio_fileio_sync; /* cast away const */
*((ncio_freefunc **)&nciop->free) = ncio_fileio_free; /* cast away const */
ffp->pos = -1;
ffp->bf_offset = OFF_NONE;
ffp->bf_extent = 0;
ffp->bf_cnt = 0;
ffp->bf_base = NULL;
}
/* */
static void
ncio_free(ncio *nciop)
{
if(nciop == NULL)
return;
if(nciop->free != NULL)
nciop->free(nciop->pvt);
free(nciop);
}
static ncio *
ncio_new(const char *path, int ioflags)
{
size_t sz_ncio = M_RNDUP(sizeof(ncio));
size_t sz_path = M_RNDUP(strlen(path) +1);
size_t sz_ncio_pvt;
ncio *nciop;
#if ALWAYS_NC_SHARE /* DEBUG */
fSet(ioflags, NC_SHARE);
#endif
if(fIsSet(ioflags, NC_SHARE))
fprintf(stderr, "NC_SHARE not implemented for fileio\n");
sz_ncio_pvt = sizeof(ncio_ffio);
nciop = (ncio *) malloc(sz_ncio + sz_path + sz_ncio_pvt);
if(nciop == NULL)
return NULL;
nciop->ioflags = ioflags;
*((int *)&nciop->fd) = -1; /* cast away const */
nciop->path = (char *) ((char *)nciop + sz_ncio);
(void) strcpy((char *)nciop->path, path); /* cast away const */
/* cast away const */
*((void **)&nciop->pvt) = (void *)(nciop->path + sz_path);
ncio_fileio_init(nciop);
return nciop;
}
/* Public below this point */
/* TODO: Is this reasonable for this platform? */
static const size_t NCIO_MINBLOCKSIZE = 0x100;
static const size_t NCIO_MAXBLOCKSIZE = 0x100000;
int
ncio_create(const char *path, int ioflags,
size_t initialsz,
off_t igeto, size_t igetsz, size_t *sizehintp,
void* parameters,
ncio **nciopp, void **const igetvpp)
{
ncio *nciop;
#ifdef _WIN32_WCE
char* oflags = "bw+"; /*==?(O_RDWR|O_CREAT|O_TRUNC) && binary*/
#else
char* oflags = "w+"; /*==?(O_RDWR|O_CREAT|O_TRUNC);*/
#endif
FILE* f;
int i,fd;
int status = ENOERR;
if(initialsz < (size_t)igeto + igetsz)
initialsz = (size_t)igeto + igetsz;
fSet(ioflags, NC_WRITE);
if(path == NULL || *path == 0)
return EINVAL;
nciop = ncio_new(path, ioflags);
if(nciop == NULL)
return ENOMEM;
if(fIsSet(ioflags, NC_NOCLOBBER)) {
/* Since we do not have use of the O_EXCL flag,
we need to fake it */
#ifdef WINCE
f = fopen(path,"rb");
#else
f = fopen(path,"r");
#endif
if(f != NULL) { /* do not overwrite */
(void)fclose(f);
return EEXIST;
}
}
f = fopen(path, oflags);
if(f == NULL)
{
status = errno;
goto unwind_new;
}
/* Locate an open pseudo file descriptor */
fd = -1;
for(i=1;i<fdmax;i++) {if(descriptors[i] == NULL) {fd=i;break;}}
if(fd < 0) {fd = fdmax; fdmax++;}
descriptors[fd] = f;
*((int *)&nciop->fd) = fd; /* cast away const */
if(*sizehintp < NCIO_MINBLOCKSIZE || *sizehintp > NCIO_MAXBLOCKSIZE)
{
/* Use default */
*sizehintp = blksize(fd);
}
else
{
*sizehintp = M_RNDUP(*sizehintp);
}
status = ncio_fileio_init2(nciop, sizehintp);
if(status != ENOERR)
goto unwind_open;
if(initialsz != 0)
{
status = fgrow(f, (off_t)initialsz);
if(status != ENOERR)
goto unwind_open;
}
if(igetsz != 0)
{
status = nciop->get(nciop,
igeto, igetsz,
RGN_WRITE,
igetvpp);
if(status != ENOERR)
goto unwind_open;
}
*nciopp = nciop;
return ENOERR;
unwind_open:
(void) fclose(descriptors[fd]);
descriptors[fd] = NULL;
/* ?? unlink */
/*FALLTHRU*/
unwind_new:
ncio_free(nciop);
return status;
}
int
ncio_open(const char *path,
int ioflags,
off_t igeto, size_t igetsz, size_t *sizehintp,
void* parameters,
ncio **nciopp, void **const igetvpp)
{
ncio *nciop;
char* oflags = fIsSet(ioflags, NC_WRITE) ? "r+"
#ifdef WINCE
: "rb";
#else
: "r";
#endif
FILE* f;
int i,fd;
int status = ENOERR;
if(path == NULL || *path == 0)
return EINVAL;
nciop = ncio_new(path, ioflags);
if(nciop == NULL)
return ENOMEM;
f = fopen(path, oflags);
if(f == NULL)
{
status = errno;
goto unwind_new;
}
/* Locate an open pseudo file descriptor */
fd = -1;
for(i=1;i<fdmax;i++) {if(descriptors[i] == NULL) {fd=i;break;}}
if(fd < 0) {fd = fdmax; fdmax++;}
descriptors[fd] = f;
*((int *)&nciop->fd) = fd; /* cast away const */
if(*sizehintp < NCIO_MINBLOCKSIZE || *sizehintp > NCIO_MAXBLOCKSIZE)
{
/* Use default */
*sizehintp = blksize(fd);
}
else
{
*sizehintp = M_RNDUP(*sizehintp);
}
status = ncio_fileio_init2(nciop, sizehintp);
if(status != ENOERR)
goto unwind_open;
if(igetsz != 0)
{
status = nciop->get(nciop,
igeto, igetsz,
0,
igetvpp);
if(status != ENOERR)
goto unwind_open;
}
*nciopp = nciop;
return ENOERR;
unwind_open:
(void) fclose(descriptors[fd]);
descriptors[fd] = NULL;
/*FALLTHRU*/
unwind_new:
ncio_free(nciop);
return status;
}
/*
* Get file size in bytes.
* Is use of fstatus = fseek() really necessary, or could we use standard fstat() call
* and get st_size member?
*/
int
ncio_filesize(ncio *nciop, off_t *filesizep)
{
int status = ENOERR;
off_t filesize, current, reset;
FILE* f;
if(nciop == NULL)
return EINVAL;
f = descriptors[nciop->fd];
current = ftell(f);
status = fseek(f, 0, SEEK_END); /* get size */
if(ferror(f)) return EIO;
*filesizep = ftell(f);
status = fseek(f, current, SEEK_SET); /* reset */
if(ferror(f)) return EIO;
return ENOERR;
}
/*
* Sync any changes to disk, then extend file so its size is length.
* This is only intended to be called before close, if the file is
* open for writing and the actual size does not match the calculated
* size, perhaps as the result of having been previously written in
* NOFILL mode.
*/
int
ncio_pad_length(ncio *nciop, off_t length)
{
int status = ENOERR;
FILE* f;
if(nciop == NULL)
return EINVAL;
f = descriptors[nciop->fd];
if(!fIsSet(nciop->ioflags, NC_WRITE))
return EPERM; /* attempt to write readonly file */
status = nciop->sync(nciop);
if(status != ENOERR)
return status;
status = fgrow2(f, length);
if(status != ENOERR)
return errno;
return ENOERR;
}
int
ncio_close(ncio *nciop, int doUnlink)
{
int status = ENOERR;
FILE* f;
if(nciop == NULL)
return EINVAL;
f = descriptors[nciop->fd];
nciop->sync(nciop);
(void) fclose(f);
descriptors[nciop->fd] = NULL;
if(doUnlink)
(void) unlink(nciop->path);
ncio_free(nciop);
return status;
}