summaryrefslogtreecommitdiffstats
path: root/libsparse/output_file.c
blob: 1cf8d8dcf0adc414a4c39563b4f9ae576ad6f120 (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
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
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define _FILE_OFFSET_BITS 64
#define _LARGEFILE64_SOURCE 1

#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <zlib.h>

#include "defs.h"
#include "output_file.h"
#include "sparse_format.h"
#include "sparse_crc32.h"

#ifndef USE_MINGW
#include <sys/mman.h>
#define O_BINARY 0
#else
#define ftruncate64 ftruncate
#endif

#if defined(__APPLE__) && defined(__MACH__)
#define lseek64 lseek
#define ftruncate64 ftruncate
#define mmap64 mmap
#define off64_t off_t
#endif

#define min(a, b) \
	({ typeof(a) _a = (a); typeof(b) _b = (b); (_a < _b) ? _a : _b; })

#define SPARSE_HEADER_MAJOR_VER 1
#define SPARSE_HEADER_MINOR_VER 0
#define SPARSE_HEADER_LEN       (sizeof(sparse_header_t))
#define CHUNK_HEADER_LEN (sizeof(chunk_header_t))

#define container_of(inner, outer_t, elem) \
	((outer_t *)((char *)inner - offsetof(outer_t, elem)))

struct output_file_ops {
	int (*open)(struct output_file *, int fd);
	int (*skip)(struct output_file *, int64_t);
	int (*pad)(struct output_file *, int64_t);
	int (*write)(struct output_file *, void *, int);
	void (*close)(struct output_file *);
};

struct sparse_file_ops {
	int (*write_data_chunk)(struct output_file *out, unsigned int len,
			void *data);
	int (*write_fill_chunk)(struct output_file *out, unsigned int len,
			uint32_t fill_val);
	int (*write_skip_chunk)(struct output_file *out, int64_t len);
	int (*write_end_chunk)(struct output_file *out);
};

struct output_file {
	int64_t cur_out_ptr;
	unsigned int chunk_cnt;
	uint32_t crc32;
	struct output_file_ops *ops;
	struct sparse_file_ops *sparse_ops;
	int use_crc;
	unsigned int block_size;
	int64_t len;
	char *zero_buf;
	uint32_t *fill_buf;
	char *buf;
};

struct output_file_gz {
	struct output_file out;
	gzFile gz_fd;
};

#define to_output_file_gz(_o) \
	container_of((_o), struct output_file_gz, out)

struct output_file_normal {
	struct output_file out;
	int fd;
};

#define to_output_file_normal(_o) \
	container_of((_o), struct output_file_normal, out)

struct output_file_callback {
	struct output_file out;
	void *priv;
	int (*write)(void *priv, const void *buf, int len);
};

#define to_output_file_callback(_o) \
	container_of((_o), struct output_file_callback, out)

static int file_open(struct output_file *out, int fd)
{
	struct output_file_normal *outn = to_output_file_normal(out);

	outn->fd = fd;
	return 0;
}

static int file_skip(struct output_file *out, int64_t cnt)
{
	off64_t ret;
	struct output_file_normal *outn = to_output_file_normal(out);

	ret = lseek64(outn->fd, cnt, SEEK_CUR);
	if (ret < 0) {
		error_errno("lseek64");
		return -1;
	}
	return 0;
}

static int file_pad(struct output_file *out, int64_t len)
{
	int ret;
	struct output_file_normal *outn = to_output_file_normal(out);

	ret = ftruncate64(outn->fd, len);
	if (ret < 0) {
		return -errno;
	}

	return 0;
}

static int file_write(struct output_file *out, void *data, int len)
{
	int ret;
	struct output_file_normal *outn = to_output_file_normal(out);

	ret = write(outn->fd, data, len);
	if (ret < 0) {
		error_errno("write");
		return -1;
	} else if (ret < len) {
		error("incomplete write");
		return -1;
	}

	return 0;
}

static void file_close(struct output_file *out)
{
	struct output_file_normal *outn = to_output_file_normal(out);

	free(outn);
}

static struct output_file_ops file_ops = {
	.open = file_open,
	.skip = file_skip,
	.pad = file_pad,
	.write = file_write,
	.close = file_close,
};

static int gz_file_open(struct output_file *out, int fd)
{
	struct output_file_gz *outgz = to_output_file_gz(out);

	outgz->gz_fd = gzdopen(fd, "wb9");
	if (!outgz->gz_fd) {
		error_errno("gzopen");
		return -errno;
	}

	return 0;
}


static int gz_file_skip(struct output_file *out, int64_t cnt)
{
	off64_t ret;
	struct output_file_gz *outgz = to_output_file_gz(out);

	ret = gzseek(outgz->gz_fd, cnt, SEEK_CUR);
	if (ret < 0) {
		error_errno("gzseek");
		return -1;
	}
	return 0;
}

static int gz_file_pad(struct output_file *out, int64_t len)
{
	off64_t ret;
	struct output_file_gz *outgz = to_output_file_gz(out);

	ret = gztell(outgz->gz_fd);
	if (ret < 0) {
		return -1;
	}

	if (ret >= len) {
		return 0;
	}

	ret = gzseek(outgz->gz_fd, len - 1, SEEK_SET);
	if (ret < 0) {
		return -1;
	}

	gzwrite(outgz->gz_fd, "", 1);

	return 0;
}

static int gz_file_write(struct output_file *out, void *data, int len)
{
	int ret;
	struct output_file_gz *outgz = to_output_file_gz(out);

	ret = gzwrite(outgz->gz_fd, data, len);
	if (ret < 0) {
		error_errno("gzwrite");
		return -1;
	} else if (ret < len) {
		error("incomplete gzwrite");
		return -1;
	}

	return 0;
}

static void gz_file_close(struct output_file *out)
{
	struct output_file_gz *outgz = to_output_file_gz(out);

	gzclose(outgz->gz_fd);
	free(outgz);
}

static struct output_file_ops gz_file_ops = {
	.open = gz_file_open,
	.skip = gz_file_skip,
	.pad = gz_file_pad,
	.write = gz_file_write,
	.close = gz_file_close,
};

static int callback_file_open(struct output_file *out __unused, int fd __unused)
{
	return 0;
}

static int callback_file_skip(struct output_file *out, int64_t off)
{
	struct output_file_callback *outc = to_output_file_callback(out);
	int to_write;
	int ret;

	while (off > 0) {
		to_write = min(off, (int64_t)INT_MAX);
		ret = outc->write(outc->priv, NULL, to_write);
		if (ret < 0) {
			return ret;
		}
		off -= to_write;
	}

	return 0;
}

static int callback_file_pad(struct output_file *out __unused, int64_t len __unused)
{
	return -1;
}

static int callback_file_write(struct output_file *out, void *data, int len)
{
	int ret;
	struct output_file_callback *outc = to_output_file_callback(out);

	return outc->write(outc->priv, data, len);
}

static void callback_file_close(struct output_file *out)
{
	struct output_file_callback *outc = to_output_file_callback(out);

	free(outc);
}

static struct output_file_ops callback_file_ops = {
	.open = callback_file_open,
	.skip = callback_file_skip,
	.pad = callback_file_pad,
	.write = callback_file_write,
	.close = callback_file_close,
};

int read_all(int fd, void *buf, size_t len)
{
	size_t total = 0;
	int ret;
	char *ptr = buf;

	while (total < len) {
		ret = read(fd, ptr, len - total);

		if (ret < 0)
			return -errno;

		if (ret == 0)
			return -EINVAL;

		ptr += ret;
		total += ret;
	}

	return 0;
}

static int write_sparse_skip_chunk(struct output_file *out, int64_t skip_len)
{
	chunk_header_t chunk_header;
	int ret, chunk;

	if (skip_len % out->block_size) {
		error("don't care size %"PRIi64" is not a multiple of the block size %u",
				skip_len, out->block_size);
		return -1;
	}

	/* We are skipping data, so emit a don't care chunk. */
	chunk_header.chunk_type = CHUNK_TYPE_DONT_CARE;
	chunk_header.reserved1 = 0;
	chunk_header.chunk_sz = skip_len / out->block_size;
	chunk_header.total_sz = CHUNK_HEADER_LEN;
	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
	if (ret < 0)
		return -1;

	out->cur_out_ptr += skip_len;
	out->chunk_cnt++;

	return 0;
}

static int write_sparse_fill_chunk(struct output_file *out, unsigned int len,
		uint32_t fill_val)
{
	chunk_header_t chunk_header;
	int rnd_up_len, zero_len, count;
	int ret;
	unsigned int i;

	/* Round up the fill length to a multiple of the block size */
	rnd_up_len = ALIGN(len, out->block_size);

	/* Finally we can safely emit a chunk of data */
	chunk_header.chunk_type = CHUNK_TYPE_FILL;
	chunk_header.reserved1 = 0;
	chunk_header.chunk_sz = rnd_up_len / out->block_size;
	chunk_header.total_sz = CHUNK_HEADER_LEN + sizeof(fill_val);
	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));

	if (ret < 0)
		return -1;
	ret = out->ops->write(out, &fill_val, sizeof(fill_val));
	if (ret < 0)
		return -1;

	if (out->use_crc) {
		count = out->block_size / sizeof(uint32_t);
		while (count--)
			out->crc32 = sparse_crc32(out->crc32, &fill_val, sizeof(uint32_t));
	}

	out->cur_out_ptr += rnd_up_len;
	out->chunk_cnt++;

	return 0;
}

static int write_sparse_data_chunk(struct output_file *out, unsigned int len,
		void *data)
{
	chunk_header_t chunk_header;
	int rnd_up_len, zero_len;
	int ret;

	/* Round up the data length to a multiple of the block size */
	rnd_up_len = ALIGN(len, out->block_size);
	zero_len = rnd_up_len - len;

	/* Finally we can safely emit a chunk of data */
	chunk_header.chunk_type = CHUNK_TYPE_RAW;
	chunk_header.reserved1 = 0;
	chunk_header.chunk_sz = rnd_up_len / out->block_size;
	chunk_header.total_sz = CHUNK_HEADER_LEN + rnd_up_len;
	ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));

	if (ret < 0)
		return -1;
	ret = out->ops->write(out, data, len);
	if (ret < 0)
		return -1;
	if (zero_len) {
		ret = out->ops->write(out, out->zero_buf, zero_len);
		if (ret < 0)
			return -1;
	}

	if (out->use_crc) {
		out->crc32 = sparse_crc32(out->crc32, data, len);
		if (zero_len)
			out->crc32 = sparse_crc32(out->crc32, out->zero_buf, zero_len);
	}

	out->cur_out_ptr += rnd_up_len;
	out->chunk_cnt++;

	return 0;
}

int write_sparse_end_chunk(struct output_file *out)
{
	chunk_header_t chunk_header;
	int ret;

	if (out->use_crc) {
		chunk_header.chunk_type = CHUNK_TYPE_CRC32;
		chunk_header.reserved1 = 0;
		chunk_header.chunk_sz = 0;
		chunk_header.total_sz = CHUNK_HEADER_LEN + 4;

		ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
		if (ret < 0) {
			return ret;
		}
		out->ops->write(out, &out->crc32, 4);
		if (ret < 0) {
			return ret;
		}

		out->chunk_cnt++;
	}

	return 0;
}

static struct sparse_file_ops sparse_file_ops = {
		.write_data_chunk = write_sparse_data_chunk,
		.write_fill_chunk = write_sparse_fill_chunk,
		.write_skip_chunk = write_sparse_skip_chunk,
		.write_end_chunk = write_sparse_end_chunk,
};

static int write_normal_data_chunk(struct output_file *out, unsigned int len,
		void *data)
{
	int ret;
	unsigned int rnd_up_len = ALIGN(len, out->block_size);

	ret = out->ops->write(out, data, len);
	if (ret < 0) {
		return ret;
	}

	if (rnd_up_len > len) {
		ret = out->ops->skip(out, rnd_up_len - len);
	}

	return ret;
}

static int write_normal_fill_chunk(struct output_file *out, unsigned int len,
		uint32_t fill_val)
{
	int ret;
	unsigned int i;
	unsigned int write_len;

	/* Initialize fill_buf with the fill_val */
	for (i = 0; i < out->block_size / sizeof(uint32_t); i++) {
		out->fill_buf[i] = fill_val;
	}

	while (len) {
		write_len = min(len, out->block_size);
		ret = out->ops->write(out, out->fill_buf, write_len);
		if (ret < 0) {
			return ret;
		}

		len -= write_len;
	}

	return 0;
}

static int write_normal_skip_chunk(struct output_file *out, int64_t len)
{
	return out->ops->skip(out, len);
}

int write_normal_end_chunk(struct output_file *out)
{
	return out->ops->pad(out, out->len);
}

static struct sparse_file_ops normal_file_ops = {
		.write_data_chunk = write_normal_data_chunk,
		.write_fill_chunk = write_normal_fill_chunk,
		.write_skip_chunk = write_normal_skip_chunk,
		.write_end_chunk = write_normal_end_chunk,
};

void output_file_close(struct output_file *out)
{
	int ret;

	out->sparse_ops->write_end_chunk(out);
	out->ops->close(out);
}

static int output_file_init(struct output_file *out, int block_size,
		int64_t len, bool sparse, int chunks, bool crc)
{
	int ret;

	out->len = len;
	out->block_size = block_size;
	out->cur_out_ptr = 0ll;
	out->chunk_cnt = 0;
	out->crc32 = 0;
	out->use_crc = crc;

	out->zero_buf = calloc(block_size, 1);
	if (!out->zero_buf) {
		error_errno("malloc zero_buf");
		return -ENOMEM;
	}

	out->fill_buf = calloc(block_size, 1);
	if (!out->fill_buf) {
		error_errno("malloc fill_buf");
		ret = -ENOMEM;
		goto err_fill_buf;
	}

	if (sparse) {
		out->sparse_ops = &sparse_file_ops;
	} else {
		out->sparse_ops = &normal_file_ops;
	}

	if (sparse) {
		sparse_header_t sparse_header = {
				.magic = SPARSE_HEADER_MAGIC,
				.major_version = SPARSE_HEADER_MAJOR_VER,
				.minor_version = SPARSE_HEADER_MINOR_VER,
				.file_hdr_sz = SPARSE_HEADER_LEN,
				.chunk_hdr_sz = CHUNK_HEADER_LEN,
				.blk_sz = out->block_size,
				.total_blks = out->len / out->block_size,
				.total_chunks = chunks,
				.image_checksum = 0
		};

		if (out->use_crc) {
			sparse_header.total_chunks++;
		}

		ret = out->ops->write(out, &sparse_header, sizeof(sparse_header));
		if (ret < 0) {
			goto err_write;
		}
	}

	return 0;

err_write:
	free(out->fill_buf);
err_fill_buf:
	free(out->zero_buf);
	return ret;
}

static struct output_file *output_file_new_gz(void)
{
	struct output_file_gz *outgz = calloc(1, sizeof(struct output_file_gz));
	if (!outgz) {
		error_errno("malloc struct outgz");
		return NULL;
	}

	outgz->out.ops = &gz_file_ops;

	return &outgz->out;
}

static struct output_file *output_file_new_normal(void)
{
	struct output_file_normal *outn = calloc(1, sizeof(struct output_file_normal));
	if (!outn) {
		error_errno("malloc struct outn");
		return NULL;
	}

	outn->out.ops = &file_ops;

	return &outn->out;
}

struct output_file *output_file_open_callback(int (*write)(void *, const void *, int),
		void *priv, unsigned int block_size, int64_t len,
		int gz __unused, int sparse, int chunks, int crc)
{
	int ret;
	struct output_file_callback *outc;

	outc = calloc(1, sizeof(struct output_file_callback));
	if (!outc) {
		error_errno("malloc struct outc");
		return NULL;
	}

	outc->out.ops = &callback_file_ops;
	outc->priv = priv;
	outc->write = write;

	ret = output_file_init(&outc->out, block_size, len, sparse, chunks, crc);
	if (ret < 0) {
		free(outc);
		return NULL;
	}

	return &outc->out;
}

struct output_file *output_file_open_fd(int fd, unsigned int block_size, int64_t len,
		int gz, int sparse, int chunks, int crc)
{
	int ret;
	struct output_file *out;

	if (gz) {
		out = output_file_new_gz();
	} else {
		out = output_file_new_normal();
	}
	if (!out) {
		return NULL;
	}

	out->ops->open(out, fd);

	ret = output_file_init(out, block_size, len, sparse, chunks, crc);
	if (ret < 0) {
		free(out);
		return NULL;
	}

	return out;
}

/* Write a contiguous region of data blocks from a memory buffer */
int write_data_chunk(struct output_file *out, unsigned int len, void *data)
{
	return out->sparse_ops->write_data_chunk(out, len, data);
}

/* Write a contiguous region of data blocks with a fill value */
int write_fill_chunk(struct output_file *out, unsigned int len,
		uint32_t fill_val)
{
	return out->sparse_ops->write_fill_chunk(out, len, fill_val);
}

int write_fd_chunk(struct output_file *out, unsigned int len,
		int fd, int64_t offset)
{
	int ret;
	int64_t aligned_offset;
	int aligned_diff;
	int buffer_size;
	char *ptr;

	aligned_offset = offset & ~(4096 - 1);
	aligned_diff = offset - aligned_offset;
	buffer_size = len + aligned_diff;

#ifndef USE_MINGW
	char *data = mmap64(NULL, buffer_size, PROT_READ, MAP_SHARED, fd,
			aligned_offset);
	if (data == MAP_FAILED) {
		return -errno;
	}
	ptr = data + aligned_diff;
#else
	off64_t pos;
	char *data = malloc(len);
	if (!data) {
		return -errno;
	}
	pos = lseek64(fd, offset, SEEK_SET);
	if (pos < 0) {
                free(data);
		return -errno;
	}
	ret = read_all(fd, data, len);
	if (ret < 0) {
                free(data);
		return ret;
	}
	ptr = data;
#endif

	ret = out->sparse_ops->write_data_chunk(out, len, ptr);

#ifndef USE_MINGW
	munmap(data, buffer_size);
#else
	free(data);
#endif

	return ret;
}

/* Write a contiguous region of data blocks from a file */
int write_file_chunk(struct output_file *out, unsigned int len,
		const char *file, int64_t offset)
{
	int ret;

	int file_fd = open(file, O_RDONLY | O_BINARY);
	if (file_fd < 0) {
		return -errno;
	}

	ret = write_fd_chunk(out, len, file_fd, offset);

	close(file_fd);

	return ret;
}

int write_skip_chunk(struct output_file *out, int64_t len)
{
	return out->sparse_ops->write_skip_chunk(out, len);
}