summaryrefslogtreecommitdiff
path: root/src/io.c
blob: da0e66f8626ce980f285f3f76719d4f87f7b9254 (plain) (blame)
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
/* io.c - Alpine Package Keeper (APK)
 *
 * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
 * Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation. See http://www.gnu.org/ for details.
 */

#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/mman.h>

#include "apk_defines.h"
#include "apk_io.h"

struct apk_fd_istream {
	struct apk_istream is;
	int fd;
};

static ssize_t fdi_read(void *stream, void *ptr, size_t size)
{
	struct apk_fd_istream *fis =
		container_of(stream, struct apk_fd_istream, is);
	ssize_t i = 0, r;

	if (ptr == NULL) {
		if (lseek(fis->fd, size, SEEK_CUR) < 0)
			return -errno;
		return size;
	}

	while (i < size) {
		r = read(fis->fd, ptr + i, size - i);
		if (r < 0)
			return -errno;
		if (r == 0)
			return i;
		i += r;
	}

	return i;
}

static void fdi_close(void *stream)
{
	struct apk_fd_istream *fis =
		container_of(stream, struct apk_fd_istream, is);

	close(fis->fd);
	free(fis);
}

struct apk_istream *apk_istream_from_fd(int fd)
{
	struct apk_fd_istream *fis;

	if (fd < 0)
		return NULL;

	fis = malloc(sizeof(struct apk_fd_istream));
	if (fis == NULL)
		return NULL;

	*fis = (struct apk_fd_istream) {
		.is.read = fdi_read,
		.is.close = fdi_close,
		.fd = fd,
	};

	return &fis->is;
}

struct apk_istream *apk_istream_from_file(const char *file)
{
	int fd;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		return NULL;

	fcntl(fd, F_SETFD, FD_CLOEXEC);

	return apk_istream_from_fd(fd);
}

size_t apk_istream_skip(struct apk_istream *is, size_t size)
{
	unsigned char buf[2048];
	size_t done = 0, r, togo;

	while (done < size) {
		togo = size - done;
		if (togo > sizeof(buf))
			togo = sizeof(buf);
		r = is->read(is, buf, togo);
		if (r < 0)
			return r;
		done += r;
		if (r != togo)
			break;
	}
	return done;
}

size_t apk_istream_splice(void *stream, int fd, size_t size,
			  apk_progress_cb cb, void *cb_ctx)
{
	struct apk_istream *is = (struct apk_istream *) stream;
	unsigned char *buf;
	size_t bufsz, done = 0, r, togo;

	bufsz = size;
	if (bufsz > 256*1024)
		bufsz = 256*1024;

	buf = malloc(bufsz);
	if (buf == NULL)
		return -ENOMEM;

	while (done < size) {
		if (done != 0 && cb != NULL)
			cb(cb_ctx, muldiv(APK_PROGRESS_SCALE, done, size));

		togo = size - done;
		if (togo > bufsz)
			togo = bufsz;
		r = is->read(is, buf, togo);
		if (r < 0)
			goto err;
		if (write(fd, buf, r) != r) {
			if (r < 0)
				r = -errno;
			goto err;
		}
		done += r;
		if (r != togo)
			break;
	}
	r = done;
err:
	free(buf);
	return r;
}

struct apk_istream_bstream {
	struct apk_bstream bs;
	struct apk_istream *is;
	apk_blob_t left;
	char buffer[8*1024];
	size_t size;
};

static apk_blob_t is_bs_read(void *stream, apk_blob_t token)
{
	struct apk_istream_bstream *isbs =
		container_of(stream, struct apk_istream_bstream, bs);
	ssize_t size;
	apk_blob_t ret;

	/* If we have cached stuff, first check if it full fills the request */
	if (isbs->left.len != 0) {
		if (!APK_BLOB_IS_NULL(token)) {
			/* If we have tokenized thingy left, return it */
			if (apk_blob_split(isbs->left, token, &ret, &isbs->left))
				goto ret;
		} else
			goto ret_all;
	}

	/* If we've exchausted earlier, it's end of stream */
	if (APK_BLOB_IS_NULL(isbs->left))
		return APK_BLOB_NULL;

	/* We need more data */
	if (isbs->left.len != 0)
		memcpy(isbs->buffer, isbs->left.ptr, isbs->left.len);
	isbs->left.ptr = isbs->buffer;
	size = isbs->is->read(isbs->is, isbs->buffer + isbs->left.len,
			      sizeof(isbs->buffer) - isbs->left.len);
	if (size > 0) {
		isbs->size += size;
		isbs->left.len += size;
	} else if (size == 0) {
		if (isbs->left.len == 0)
			isbs->left = APK_BLOB_NULL;
		goto ret_all;
	}

	if (!APK_BLOB_IS_NULL(token)) {
		/* If we have tokenized thingy left, return it */
		if (apk_blob_split(isbs->left, token, &ret, &isbs->left))
			goto ret;
		/* No token found; just return the full buffer */
	}

ret_all:
	/* Return all that is in cache */
	ret = isbs->left;
	isbs->left.len = 0;
ret:
	return ret;
}

static void is_bs_close(void *stream, size_t *size)
{
	struct apk_istream_bstream *isbs =
		container_of(stream, struct apk_istream_bstream, bs);

	if (size != NULL)
		*size = isbs->size;

	isbs->is->close(isbs->is);
	free(isbs);
}

struct apk_bstream *apk_bstream_from_istream(struct apk_istream *istream)
{
	struct apk_istream_bstream *isbs;

	isbs = malloc(sizeof(struct apk_istream_bstream));
	if (isbs == NULL)
		return NULL;

	isbs->bs = (struct apk_bstream) {
		.read = is_bs_read,
		.close = is_bs_close,
	};
	isbs->is = istream;
	isbs->left = APK_BLOB_PTR_LEN(isbs->buffer, 0),
	isbs->size = 0;

	return &isbs->bs;
}

struct apk_mmap_bstream {
	struct apk_bstream bs;
	int fd;
	size_t size;
	unsigned char *ptr;
	apk_blob_t left;
};

static apk_blob_t mmap_read(void *stream, apk_blob_t token)
{
	struct apk_mmap_bstream *mbs =
		container_of(stream, struct apk_mmap_bstream, bs);
	apk_blob_t ret;

	if (!APK_BLOB_IS_NULL(token) && !APK_BLOB_IS_NULL(mbs->left)) {
		if (apk_blob_split(mbs->left, token, &ret, &mbs->left))
			return ret;
	}

	ret = mbs->left;
	mbs->left = APK_BLOB_NULL;
	mbs->bs.flags |= APK_BSTREAM_EOF;

	return ret;
}

static void mmap_close(void *stream, size_t *size)
{
	struct apk_mmap_bstream *mbs =
		container_of(stream, struct apk_mmap_bstream, bs);

	if (size != NULL)
		*size = mbs->size;

	munmap(mbs->ptr, mbs->size);
	close(mbs->fd);
	free(mbs);
}

static struct apk_bstream *apk_mmap_bstream_from_fd(int fd)
{
	struct apk_mmap_bstream *mbs;
	struct stat st;
	void *ptr;

	if (fstat(fd, &st) < 0)
		return NULL;

	ptr = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
	if (ptr == MAP_FAILED)
		return NULL;

	mbs = malloc(sizeof(struct apk_mmap_bstream));
	if (mbs == NULL) {
		munmap(ptr, st.st_size);
		return NULL;
	}

	mbs->bs = (struct apk_bstream) {
		.flags = APK_BSTREAM_SINGLE_READ,
		.read = mmap_read,
		.close = mmap_close,
	};
	mbs->fd = fd;
	mbs->size = st.st_size;
	mbs->ptr = ptr;
	mbs->left = APK_BLOB_PTR_LEN(ptr, mbs->size);

	return &mbs->bs;
}

struct apk_bstream *apk_bstream_from_fd(int fd)
{
	struct apk_bstream *bs;

	if (fd < 0)
		return NULL;

	bs = apk_mmap_bstream_from_fd(fd);
	if (bs != NULL)
		return bs;

	return apk_bstream_from_istream(apk_istream_from_fd(fd));
}

struct apk_bstream *apk_bstream_from_file(const char *file)
{
	int fd;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		return NULL;

	fcntl(fd, F_SETFD, FD_CLOEXEC);
	return apk_bstream_from_fd(fd);
}


struct apk_tee_bstream {
	struct apk_bstream bs;
	struct apk_bstream *inner_bs;
	int fd;
	size_t size;
};

static apk_blob_t tee_read(void *stream, apk_blob_t token)
{
	struct apk_tee_bstream *tbs =
		container_of(stream, struct apk_tee_bstream, bs);
	apk_blob_t blob;

	blob = tbs->inner_bs->read(tbs->inner_bs, token);
	if (!APK_BLOB_IS_NULL(blob))
		tbs->size += write(tbs->fd, blob.ptr, blob.len);

	return blob;
}

static void tee_close(void *stream, size_t *size)
{
	struct apk_tee_bstream *tbs =
		container_of(stream, struct apk_tee_bstream, bs);

	tbs->inner_bs->close(tbs->inner_bs, NULL);
	if (size != NULL)
		*size = tbs->size;
	close(tbs->fd);
	free(tbs);
}

struct apk_bstream *apk_bstream_tee(struct apk_bstream *from, const char *to)
{
	struct apk_tee_bstream *tbs;
	int fd;

	fd = creat(to, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
	if (fd < 0)
		return NULL;

	tbs = malloc(sizeof(struct apk_tee_bstream));
	if (tbs == NULL) {
		close(fd);
		return NULL;
	}

	tbs->bs = (struct apk_bstream) {
		.read = tee_read,
		.close = tee_close,
	};
	tbs->inner_bs = from;
	tbs->fd = fd;
	tbs->size = 0;

	return &tbs->bs;
}

apk_blob_t apk_blob_from_istream(struct apk_istream *is, size_t size)
{
	void *ptr;
	size_t rsize;

	ptr = malloc(size);
	if (ptr == NULL)
		return APK_BLOB_NULL;

	rsize = is->read(is, ptr, size);
	if (rsize < 0) {
		free(ptr);
		return APK_BLOB_NULL;
	}
	if (rsize != size)
		ptr = realloc(ptr, rsize);

	return APK_BLOB_PTR_LEN(ptr, rsize);
}

apk_blob_t apk_blob_from_file(const char *file)
{
	int fd;
	struct stat st;
	char *buf;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		return APK_BLOB_NULL;

	if (fstat(fd, &st) < 0)
		goto err_fd;

	buf = malloc(st.st_size);
	if (buf == NULL)
		goto err_fd;

	if (read(fd, buf, st.st_size) != st.st_size)
		goto err_read;

	close(fd);
	return APK_BLOB_PTR_LEN(buf, st.st_size);
err_read:
	free(buf);
err_fd:
	close(fd);
	return APK_BLOB_NULL;
}

int apk_file_get_info(const char *filename, int checksum, struct apk_file_info *fi)
{
	struct stat st;
	struct apk_bstream *bs;

	if (stat(filename, &st) != 0)
		return -errno;

	*fi = (struct apk_file_info) {
		.size = st.st_size,
		.uid = st.st_uid,
		.gid = st.st_gid,
		.mode = st.st_mode,
		.mtime = st.st_mtime,
		.device = st.st_dev,
	};

	if (checksum == APK_CHECKSUM_NONE)
		return 0;

	bs = apk_bstream_from_file(filename);
	if (bs != NULL) {
		EVP_MD_CTX mdctx;
		apk_blob_t blob;

		EVP_DigestInit(&mdctx, apk_get_digest(checksum));
		if (bs->flags & APK_BSTREAM_SINGLE_READ)
			EVP_MD_CTX_set_flags(&mdctx, EVP_MD_CTX_FLAG_ONESHOT);
		while (!APK_BLOB_IS_NULL(blob = bs->read(bs, APK_BLOB_NULL)))
			EVP_DigestUpdate(&mdctx, (void*) blob.ptr, blob.len);
		fi->csum.type = EVP_MD_CTX_size(&mdctx);
		EVP_DigestFinal(&mdctx, fi->csum.data, NULL);

		bs->close(bs, NULL);
	}

	return 0;
}

struct apk_istream *apk_istream_from_file_gz(const char *file)
{
	return apk_bstream_gunzip(apk_bstream_from_file(file));
}

struct apk_fd_ostream {
	struct apk_ostream os;
	int fd;
	size_t bytes;
	char buffer[1024];
};

static ssize_t safe_write(int fd, const void *ptr, size_t size)
{
	ssize_t i = 0, r;

	while (i < size) {
		r = write(fd, ptr + i, size - i);
		if (r < 0)
			return -errno;
		if (r == 0)
			return i;
		i += r;
	}

	return i;
}

static ssize_t fdo_flush(struct apk_fd_ostream *fos)
{
	ssize_t r;

	if (fos->bytes == 0)
		return 0;

	if ((r = safe_write(fos->fd, fos->buffer, fos->bytes)) != fos->bytes)
		return r;

	fos->bytes = 0;
	return 0;
}

static ssize_t fdo_write(void *stream, const void *ptr, size_t size)
{
	struct apk_fd_ostream *fos =
		container_of(stream, struct apk_fd_ostream, os);
	ssize_t r;

	if (size + fos->bytes >= sizeof(fos->buffer)) {
		r = fdo_flush(fos);
		if (r != 0)
			return r;
		if (size >= sizeof(fos->buffer) / 2)
			return safe_write(fos->fd, ptr, size);
	}

	memcpy(&fos->buffer[fos->bytes], ptr, size);
	fos->bytes += size;

	return size;
}

static void fdo_close(void *stream)
{
	struct apk_fd_ostream *fos =
		container_of(stream, struct apk_fd_ostream, os);

	fdo_flush(fos);
	close(fos->fd);
	free(fos);
}

struct apk_ostream *apk_ostream_to_fd(int fd)
{
	struct apk_fd_ostream *fos;

	if (fd < 0)
		return NULL;

	fos = malloc(sizeof(struct apk_fd_ostream));
	if (fos == NULL)
		return NULL;

	*fos = (struct apk_fd_ostream) {
		.os.write = fdo_write,
		.os.close = fdo_close,
		.fd = fd,
	};

	return &fos->os;
}

struct apk_ostream *apk_ostream_to_file(const char *file, mode_t mode)
{
	int fd;

	fd = creat(file, mode);
	if (fd < 0)
		return NULL;

	fcntl(fd, F_SETFD, FD_CLOEXEC);

	return apk_ostream_to_fd(fd);
}

struct apk_counter_ostream {
	struct apk_ostream os;
	off_t *counter;
};

static ssize_t co_write(void *stream, const void *ptr, size_t size)
{
	struct apk_counter_ostream *cos =
		container_of(stream, struct apk_counter_ostream, os);

	*cos->counter += size;
	return size;
}

static void co_close(void *stream)
{
	struct apk_counter_ostream *cos =
		container_of(stream, struct apk_counter_ostream, os);

	free(cos);
}

struct apk_ostream *apk_ostream_counter(off_t *counter)
{
	struct apk_counter_ostream *cos;

	cos = malloc(sizeof(struct apk_counter_ostream));
	if (cos == NULL)
		return NULL;

	*cos = (struct apk_counter_ostream) {
		.os.write = co_write,
		.os.close = co_close,
		.counter = counter,
	};

	return &cos->os;
}

size_t apk_ostream_write_string(struct apk_ostream *os, const char *string)
{
	size_t len;

	len = strlen(string);
	if (os->write(os, string, len) != len)
		return -1;

	return len;
}