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Date:: Sat Feb 12 17:22:05 2022 UTC
Message:: set zlib output buffer length properly after resizing the output buffer ok millert naddy
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1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <zlib.h>
24 #include <time.h>
25 
26 #include "got_error.h"
27 #include "got_object.h"
28 #include "got_path.h"
29 
30 #include "got_lib_inflate.h"
31 
32 #ifndef MIN
33 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
34 #endif
35 
36 const struct got_error *
37 got_inflate_init(struct got_inflate_buf *zb, uint8_t *outbuf, size_t bufsize,
38     struct got_inflate_checksum *csum)
39 {
40 	const struct got_error *err = NULL;
41 	int zerr;
42 
43 	memset(&zb->z, 0, sizeof(zb->z));
44 
45 	zb->z.zalloc = Z_NULL;
46 	zb->z.zfree = Z_NULL;
47 	zerr = inflateInit(&zb->z);
48 	if (zerr != Z_OK) {
49 		if  (zerr == Z_ERRNO)
50 			return got_error_from_errno("inflateInit");
51 		if  (zerr == Z_MEM_ERROR) {
52 			errno = ENOMEM;
53 			return got_error_from_errno("inflateInit");
54 		}
55 		return got_error(GOT_ERR_DECOMPRESSION);
56 	}
57 
58 	zb->inlen = zb->outlen = bufsize;
59 
60 	zb->inbuf = calloc(1, zb->inlen);
61 	if (zb->inbuf == NULL) {
62 		err = got_error_from_errno("calloc");
63 		goto done;
64 	}
65 
66 	zb->flags = 0;
67 	if (outbuf == NULL) {
68 		zb->outbuf = calloc(1, zb->outlen);
69 		if (zb->outbuf == NULL) {
70 			err = got_error_from_errno("calloc");
71 			goto done;
72 		}
73 		zb->flags |= GOT_INFLATE_F_OWN_OUTBUF;
74 	} else
75 		zb->outbuf = outbuf;
76 
77 	zb->csum = csum;
78 done:
79 	if (err)
80 		got_inflate_end(zb);
81 	return err;
82 }
83 
84 static void
85 csum_input(struct got_inflate_checksum *csum, const uint8_t *buf, size_t len)
86 {
87 	if (csum->input_crc)
88 		*csum->input_crc = crc32(*csum->input_crc, buf, len);
89 
90 	if (csum->input_sha1)
91 		SHA1Update(csum->input_sha1, buf, len);
92 }
93 
94 static void
95 csum_output(struct got_inflate_checksum *csum, const uint8_t *buf, size_t len)
96 {
97 	if (csum->output_crc)
98 		*csum->output_crc = crc32(*csum->output_crc, buf, len);
99 
100 	if (csum->output_sha1)
101 		SHA1Update(csum->output_sha1, buf, len);
102 }
103 
104 const struct got_error *
105 got_inflate_read(struct got_inflate_buf *zb, FILE *f, size_t *outlenp,
106     size_t *consumed)
107 {
108 	size_t last_total_out = zb->z.total_out;
109 	size_t last_total_in = zb->z.total_in;
110 	z_stream *z = &zb->z;
111 	int ret = Z_ERRNO;
112 
113 	z->next_out = zb->outbuf;
114 	z->avail_out = zb->outlen;
115 
116 	*outlenp = 0;
117 	if (consumed)
118 		*consumed = 0;
119 	do {
120 		uint8_t *csum_in = NULL, *csum_out = NULL;
121 		size_t csum_avail_in = 0, csum_avail_out = 0;
122 
123 		if (z->avail_in == 0) {
124 			size_t n = fread(zb->inbuf, 1, zb->inlen, f);
125 			if (n == 0) {
126 				if (ferror(f))
127 					return got_ferror(f, GOT_ERR_IO);
128 				/* EOF */
129 				ret = Z_STREAM_END;
130 				break;
131 			}
132 			z->next_in = zb->inbuf;
133 			z->avail_in = n;
134 		}
135 		if (zb->csum) {
136 			csum_in = z->next_in;
137 			csum_avail_in = z->avail_in;
138 			csum_out = z->next_out;
139 			csum_avail_out = z->avail_out;
140 		}
141 		ret = inflate(z, Z_SYNC_FLUSH);
142 		if (zb->csum) {
143 			csum_input(zb->csum, csum_in,
144 			    csum_avail_in - z->avail_in);
145 			csum_output(zb->csum, csum_out,
146 			    csum_avail_out - z->avail_out);
147 		}
148 	} while (ret == Z_OK && z->avail_out > 0);
149 
150 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
151 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
152 	} else {
153 		if (ret != Z_STREAM_END)
154 			return got_error(GOT_ERR_DECOMPRESSION);
155 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
156 	}
157 
158 	*outlenp = z->total_out - last_total_out;
159 	if (consumed)
160 		*consumed += z->total_in - last_total_in;
161 	return NULL;
162 }
163 
164 const struct got_error *
165 got_inflate_read_fd(struct got_inflate_buf *zb, int fd, size_t *outlenp,
166     size_t *consumed)
167 {
168 	size_t last_total_out = zb->z.total_out;
169 	size_t last_total_in = zb->z.total_in;
170 	z_stream *z = &zb->z;
171 	int ret = Z_ERRNO;
172 
173 	z->next_out = zb->outbuf;
174 	z->avail_out = zb->outlen;
175 
176 	*outlenp = 0;
177 	if (consumed)
178 		*consumed = 0;
179 	do {
180 		uint8_t *csum_in = NULL, *csum_out = NULL;
181 		size_t csum_avail_in = 0, csum_avail_out = 0;
182 
183 		if (z->avail_in == 0) {
184 			ssize_t n = read(fd, zb->inbuf, zb->inlen);
185 			if (n < 0)
186 				return got_error_from_errno("read");
187 			else if (n == 0) {
188 				/* EOF */
189 				ret = Z_STREAM_END;
190 				break;
191 			}
192 			z->next_in = zb->inbuf;
193 			z->avail_in = n;
194 		}
195 		if (zb->csum) {
196 			csum_in = z->next_in;
197 			csum_avail_in = z->avail_in;
198 			csum_out = z->next_out;
199 			csum_avail_out = z->avail_out;
200 		}
201 		ret = inflate(z, Z_SYNC_FLUSH);
202 		if (zb->csum) {
203 			csum_input(zb->csum, csum_in,
204 			    csum_avail_in - z->avail_in);
205 			csum_output(zb->csum, csum_out,
206 			    csum_avail_out - z->avail_out);
207 		}
208 	} while (ret == Z_OK && z->avail_out > 0);
209 
210 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
211 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
212 	} else {
213 		if (ret != Z_STREAM_END)
214 			return got_error(GOT_ERR_DECOMPRESSION);
215 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
216 	}
217 
218 	*outlenp = z->total_out - last_total_out;
219 	if (consumed)
220 		*consumed += z->total_in - last_total_in;
221 	return NULL;
222 }
223 
224 const struct got_error *
225 got_inflate_read_mmap(struct got_inflate_buf *zb, uint8_t *map, size_t offset,
226     size_t len, size_t *outlenp, size_t *consumed)
227 {
228 	size_t last_total_out = zb->z.total_out;
229 	z_stream *z = &zb->z;
230 	int ret = Z_ERRNO;
231 
232 	z->next_out = zb->outbuf;
233 	z->avail_out = zb->outlen;
234 
235 	*outlenp = 0;
236 	*consumed = 0;
237 
238 	do {
239 		uint8_t *csum_in = NULL, *csum_out = NULL;
240 		size_t csum_avail_in = 0, csum_avail_out = 0;
241 		size_t last_total_in = zb->z.total_in;
242 
243 		if (z->avail_in == 0) {
244 			if (len == 0) {
245 				/* EOF */
246 				ret = Z_STREAM_END;
247 				break;
248 			}
249 			z->next_in = map + offset + *consumed;
250 			if (len - *consumed > UINT_MAX)
251 				z->avail_in = UINT_MAX;
252 			else
253 				z->avail_in = len - *consumed;
254 		}
255 		if (zb->csum) {
256 			csum_in = z->next_in;
257 			csum_avail_in = z->avail_in;
258 			csum_out = z->next_out;
259 			csum_avail_out = z->avail_out;
260 		}
261 		ret = inflate(z, Z_SYNC_FLUSH);
262 		if (zb->csum) {
263 			csum_input(zb->csum, csum_in,
264 			    csum_avail_in - z->avail_in);
265 			csum_output(zb->csum, csum_out,
266 			    csum_avail_out - z->avail_out);
267 		}
268 		*consumed += z->total_in - last_total_in;
269 	} while (ret == Z_OK && z->avail_out > 0);
270 
271 	if (ret == Z_OK || ret == Z_BUF_ERROR) {
272 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
273 	} else {
274 		if (ret != Z_STREAM_END)
275 			return got_error(GOT_ERR_DECOMPRESSION);
276 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
277 	}
278 
279 	*outlenp = z->total_out - last_total_out;
280 	return NULL;
281 }
282 
283 void
284 got_inflate_end(struct got_inflate_buf *zb)
285 {
286 	free(zb->inbuf);
287 	if (zb->flags & GOT_INFLATE_F_OWN_OUTBUF)
288 		free(zb->outbuf);
289 	inflateEnd(&zb->z);
290 }
291 
292 const struct got_error *
293 got_inflate_to_mem(uint8_t **outbuf, size_t *outlen,
294     size_t *consumed_total, struct got_inflate_checksum *csum, FILE *f)
295 {
296 	const struct got_error *err;
297 	size_t avail, consumed;
298 	struct got_inflate_buf zb;
299 	void *newbuf;
300 	int nbuf = 1;
301 
302 	if (outbuf) {
303 		*outbuf = malloc(GOT_INFLATE_BUFSIZE);
304 		if (*outbuf == NULL)
305 			return got_error_from_errno("malloc");
306 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
307 	} else
308 		err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
309 	if (err)
310 		return err;
311 
312 	*outlen = 0;
313 	if (consumed_total)
314 		*consumed_total = 0;
315 
316 	do {
317 		err = got_inflate_read(&zb, f, &avail, &consumed);
318 		if (err)
319 			goto done;
320 		*outlen += avail;
321 		if (consumed_total)
322 			*consumed_total += consumed;
323 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
324 			if (outbuf == NULL)
325 				continue;
326 			newbuf = reallocarray(*outbuf, ++nbuf,
327 			    GOT_INFLATE_BUFSIZE);
328 			if (newbuf == NULL) {
329 				err = got_error_from_errno("reallocarray");
330 				free(*outbuf);
331 				*outbuf = NULL;
332 				*outlen = 0;
333 				goto done;
334 			}
335 			*outbuf = newbuf;
336 			zb.outbuf = newbuf + *outlen;
337 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
338 		}
339 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
340 
341 done:
342 	got_inflate_end(&zb);
343 	return err;
344 }
345 
346 const struct got_error *
347 got_inflate_to_mem_fd(uint8_t **outbuf, size_t *outlen,
348     size_t *consumed_total, struct got_inflate_checksum *csum, 
349     size_t expected_size, int infd)
350 {
351 	const struct got_error *err;
352 	size_t avail, consumed;
353 	struct got_inflate_buf zb;
354 	void *newbuf;
355 	int nbuf = 1;
356 	size_t bufsize = GOT_INFLATE_BUFSIZE;
357 
358 	/* Optimize buffer size in case short reads should suffice. */
359 	if (expected_size > 0 && expected_size < bufsize)
360 		bufsize = expected_size;
361 
362 	if (outbuf) {
363 		*outbuf = malloc(bufsize);
364 		if (*outbuf == NULL)
365 			return got_error_from_errno("malloc");
366 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
367 	} else
368 		err = got_inflate_init(&zb, NULL, bufsize, csum);
369 	if (err)
370 		goto done;
371 
372 	*outlen = 0;
373 	if (consumed_total)
374 		*consumed_total = 0;
375 
376 	do {
377 		err = got_inflate_read_fd(&zb, infd, &avail, &consumed);
378 		if (err)
379 			goto done;
380 		*outlen += avail;
381 		if (consumed_total)
382 			*consumed_total += consumed;
383 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
384 			if (outbuf == NULL)
385 				continue;
386 			newbuf = reallocarray(*outbuf, ++nbuf,
387 			    GOT_INFLATE_BUFSIZE);
388 			if (newbuf == NULL) {
389 				err = got_error_from_errno("reallocarray");
390 				free(*outbuf);
391 				*outbuf = NULL;
392 				*outlen = 0;
393 				goto done;
394 			}
395 			*outbuf = newbuf;
396 			zb.outbuf = newbuf + *outlen;
397 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
398 		}
399 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
400 
401 done:
402 	got_inflate_end(&zb);
403 	return err;
404 }
405 
406 const struct got_error *
407 got_inflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
408     size_t *consumed_total, struct got_inflate_checksum *csum, uint8_t *map,
409     size_t offset, size_t len)
410 {
411 	const struct got_error *err;
412 	size_t avail, consumed;
413 	struct got_inflate_buf zb;
414 	void *newbuf;
415 	int nbuf = 1;
416 
417 	if (outbuf) {
418 		*outbuf = malloc(GOT_INFLATE_BUFSIZE);
419 		if (*outbuf == NULL)
420 			return got_error_from_errno("malloc");
421 		err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE, csum);
422 		if (err) {
423 			free(*outbuf);
424 			*outbuf = NULL;
425 			return err;
426 		}
427 	} else {
428 		err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
429 		if (err)
430 			return err;
431 	}
432 
433 	*outlen = 0;
434 	if (consumed_total)
435 		*consumed_total = 0;
436 	do {
437 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
438 		    &consumed);
439 		if (err)
440 			goto done;
441 		offset += consumed;
442 		if (consumed_total)
443 			*consumed_total += consumed;
444 		len -= consumed;
445 		*outlen += avail;
446 		if (len == 0)
447 			break;
448 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
449 			if (outbuf == NULL)
450 				continue;
451 			newbuf = reallocarray(*outbuf, ++nbuf,
452 			    GOT_INFLATE_BUFSIZE);
453 			if (newbuf == NULL) {
454 				err = got_error_from_errno("reallocarray");
455 				free(*outbuf);
456 				*outbuf = NULL;
457 				*outlen = 0;
458 				goto done;
459 			}
460 			*outbuf = newbuf;
461 			zb.outbuf = newbuf + *outlen;
462 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
463 		}
464 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
465 done:
466 	got_inflate_end(&zb);
467 	return err;
468 }
469 
470 const struct got_error *
471 got_inflate_to_fd(size_t *outlen, FILE *infile,
472     struct got_inflate_checksum *csum, int outfd)
473 {
474 	const struct got_error *err = NULL;
475 	size_t avail;
476 	struct got_inflate_buf zb;
477 
478 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
479 	if (err)
480 		goto done;
481 
482 	*outlen = 0;
483 
484 	do {
485 		err = got_inflate_read(&zb, infile, &avail, NULL);
486 		if (err)
487 			goto done;
488 		if (avail > 0) {
489 			ssize_t n;
490 			n = write(outfd, zb.outbuf, avail);
491 			if (n != avail) {
492 				err = got_error_from_errno("write");
493 				goto done;
494 			}
495 			*outlen += avail;
496 		}
497 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
498 
499 done:
500 	if (err == NULL) {
501 		if (lseek(outfd, SEEK_SET, 0) == -1)
502 			err = got_error_from_errno("lseek");
503 	}
504 	got_inflate_end(&zb);
505 	return err;
506 }
507 
508 const struct got_error *
509 got_inflate_to_file(size_t *outlen, FILE *infile,
510     struct got_inflate_checksum *csum, FILE *outfile)
511 {
512 	const struct got_error *err;
513 	size_t avail;
514 	struct got_inflate_buf zb;
515 
516 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
517 	if (err)
518 		goto done;
519 
520 	*outlen = 0;
521 
522 	do {
523 		err = got_inflate_read(&zb, infile, &avail, NULL);
524 		if (err)
525 			goto done;
526 		if (avail > 0) {
527 			size_t n;
528 			n = fwrite(zb.outbuf, avail, 1, outfile);
529 			if (n != 1) {
530 				err = got_ferror(outfile, GOT_ERR_IO);
531 				goto done;
532 			}
533 			*outlen += avail;
534 		}
535 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
536 
537 done:
538 	if (err == NULL)
539 		rewind(outfile);
540 	got_inflate_end(&zb);
541 	return err;
542 }
543 
544 const struct got_error *
545 got_inflate_to_file_fd(size_t *outlen, size_t *consumed_total,
546     struct got_inflate_checksum *csum, int infd, FILE *outfile)
547 {
548 	const struct got_error *err;
549 	size_t avail, consumed;
550 	struct got_inflate_buf zb;
551 
552 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
553 	if (err)
554 		goto done;
555 
556 	*outlen = 0;
557 	if (consumed_total)
558 		*consumed_total = 0;
559 	do {
560 		err = got_inflate_read_fd(&zb, infd, &avail, &consumed);
561 		if (err)
562 			goto done;
563 		if (avail > 0) {
564 			size_t n;
565 			n = fwrite(zb.outbuf, avail, 1, outfile);
566 			if (n != 1) {
567 				err = got_ferror(outfile, GOT_ERR_IO);
568 				goto done;
569 			}
570 			*outlen += avail;
571 			if (consumed_total)
572 				*consumed_total += consumed;
573 		}
574 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
575 
576 done:
577 	if (err == NULL)
578 		rewind(outfile);
579 	got_inflate_end(&zb);
580 	return err;
581 }
582 
583 const struct got_error *
584 got_inflate_to_file_mmap(size_t *outlen, size_t *consumed_total,
585     struct got_inflate_checksum *csum, uint8_t *map, size_t offset,
586     size_t len, FILE *outfile)
587 {
588 	const struct got_error *err;
589 	size_t avail, consumed;
590 	struct got_inflate_buf zb;
591 
592 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE, csum);
593 	if (err)
594 		goto done;
595 
596 	*outlen = 0;
597 	if (consumed_total)
598 		*consumed_total = 0;
599 	do {
600 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
601 		    &consumed);
602 		if (err)
603 			goto done;
604 		offset += consumed;
605 		if (consumed_total)
606 			*consumed_total += consumed;
607 		len -= consumed;
608 		if (avail > 0) {
609 			size_t n;
610 			n = fwrite(zb.outbuf, avail, 1, outfile);
611 			if (n != 1) {
612 				err = got_ferror(outfile, GOT_ERR_IO);
613 				goto done;
614 			}
615 			*outlen += avail;
616 		}
617 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
618 
619 done:
620 	if (err == NULL)
621 		rewind(outfile);
622 	got_inflate_end(&zb);
623 	return err;
624 }