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Date:: Sun Feb 26 21:34:11 2023 UTC
Message:: remove now unused sha1 handling from inflate and deflate both were changed to use the new got_hash APIs.
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1 /*
2  * Copyright (c) 2019 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 #include <sys/queue.h>
18 
19 #include <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sha1.h>
24 #include <sha2.h>
25 #include <zlib.h>
26 #include <time.h>
27 
28 #include "got_error.h"
29 #include "got_object.h"
30 #include "got_path.h"
31 
32 #include "got_lib_deflate.h"
33 #include "got_lib_hash.h"
34 #include "got_lib_poll.h"
35 
36 #ifndef MIN
37 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
38 #endif
39 
40 const struct got_error *
41 got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
42 {
43 	const struct got_error *err = NULL;
44 	int zerr;
45 
46 	memset(zb, 0, sizeof(*zb));
47 
48 	zb->z.zalloc = Z_NULL;
49 	zb->z.zfree = Z_NULL;
50 	zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
51 	if (zerr != Z_OK) {
52 		if  (zerr == Z_ERRNO)
53 			return got_error_from_errno("deflateInit");
54 		if  (zerr == Z_MEM_ERROR) {
55 			errno = ENOMEM;
56 			return got_error_from_errno("deflateInit");
57 		}
58 		return got_error(GOT_ERR_COMPRESSION);
59 	}
60 
61 	zb->inlen = zb->outlen = bufsize;
62 
63 	zb->inbuf = calloc(1, zb->inlen);
64 	if (zb->inbuf == NULL) {
65 		err = got_error_from_errno("calloc");
66 		goto done;
67 	}
68 
69 	zb->flags = 0;
70 	if (outbuf == NULL) {
71 		zb->outbuf = calloc(1, zb->outlen);
72 		if (zb->outbuf == NULL) {
73 			err = got_error_from_errno("calloc");
74 			goto done;
75 		}
76 		zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
77 	} else
78 		zb->outbuf = outbuf;
79 done:
80 	if (err)
81 		got_deflate_end(zb);
82 	return err;
83 }
84 
85 static void
86 csum_output(struct got_deflate_checksum *csum, const uint8_t *buf, size_t len)
87 {
88 	if (csum->output_crc)
89 		*csum->output_crc = crc32(*csum->output_crc, buf, len);
90 
91 	if (csum->output_ctx)
92 		got_hash_update(csum->output_ctx, buf, len);
93 }
94 
95 const struct got_error *
96 got_deflate_read(struct got_deflate_buf *zb, FILE *f, off_t len,
97     size_t *outlenp, off_t *consumed)
98 {
99 	size_t last_total_out = zb->z.total_out;
100 	z_stream *z = &zb->z;
101 	int ret = Z_ERRNO;
102 
103 	z->next_out = zb->outbuf;
104 	z->avail_out = zb->outlen;
105 
106 	*outlenp = 0;
107 	*consumed = 0;
108 	do {
109 		size_t last_total_in = z->total_in;
110 		if (z->avail_in == 0) {
111 			size_t n = 0;
112 			if (*consumed < len) {
113 				n = fread(zb->inbuf, 1,
114 				    MIN(zb->inlen, len - *consumed), f);
115 			}
116 			if (n == 0) {
117 				if (ferror(f))
118 					return got_ferror(f, GOT_ERR_IO);
119 				/* EOF */
120 				ret = deflate(z, Z_FINISH);
121 				break;
122 			}
123 			z->next_in = zb->inbuf;
124 			z->avail_in = n;
125 		}
126 		ret = deflate(z, Z_NO_FLUSH);
127 		*consumed += z->total_in - last_total_in;
128 	} while (ret == Z_OK && z->avail_out > 0);
129 
130 	if (ret == Z_OK) {
131 		zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
132 	} else {
133 		if (ret != Z_STREAM_END)
134 			return got_error(GOT_ERR_COMPRESSION);
135 		zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
136 	}
137 
138 	*outlenp = z->total_out - last_total_out;
139 	return NULL;
140 }
141 
142 static const struct got_error *
143 deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
144     size_t len, size_t *outlenp, size_t *consumed, int flush_on_eof)
145 {
146 	z_stream *z = &zb->z;
147 	size_t last_total_out = z->total_out;
148 	int ret = Z_ERRNO;
149 
150 	z->next_out = zb->outbuf;
151 	z->avail_out = zb->outlen;
152 
153 	*outlenp = 0;
154 	*consumed = 0;
155 	do {
156 		size_t last_total_in = z->total_in;
157 		if (z->avail_in == 0) {
158 			z->next_in = map + offset + *consumed;
159 			if (len - *consumed > UINT_MAX)
160 				z->avail_in = UINT_MAX;
161 			else
162 				z->avail_in = len - *consumed;
163 			if (z->avail_in == 0) {
164 				/* EOF */
165 				if (flush_on_eof)
166 					ret = deflate(z, Z_FINISH);
167 				break;
168 			}
169 		}
170 		ret = deflate(z, Z_NO_FLUSH);
171 		*consumed += z->total_in - last_total_in;
172 	} while (ret == Z_OK && z->avail_out > 0);
173 
174 	if (ret == Z_OK) {
175 		zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
176 	} else {
177 		if (ret != Z_STREAM_END)
178 			return got_error(GOT_ERR_COMPRESSION);
179 		zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
180 	}
181 
182 	*outlenp = z->total_out - last_total_out;
183 	return NULL;
184 }
185 
186 const struct got_error *
187 got_deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
188     size_t len, size_t *outlenp, size_t *consumed)
189 {
190 	return deflate_read_mmap(zb, map, offset, len, outlenp, consumed, 1);
191 }
192 
193 const struct got_error *
194 got_deflate_flush(struct got_deflate_buf *zb, FILE *outfile,
195     struct got_deflate_checksum *csum, off_t *outlenp)
196 {
197 	int ret;
198 	size_t n;
199 	z_stream *z = &zb->z;
200 
201 	if (z->avail_in != 0)
202 		return got_error_msg(GOT_ERR_COMPRESSION,
203 		    "cannot flush zb with pending input data");
204 
205 	do {
206 		size_t avail, last_total_out = zb->z.total_out;
207 
208 		z->next_out = zb->outbuf;
209 		z->avail_out = zb->outlen;
210 
211 		ret = deflate(z, Z_FINISH);
212 		if (ret != Z_STREAM_END && ret != Z_OK)
213 			return got_error(GOT_ERR_COMPRESSION);
214 
215 		avail = z->total_out - last_total_out;
216 		if (avail > 0) {
217 			n = fwrite(zb->outbuf, avail, 1, outfile);
218 			if (n != 1)
219 				return got_ferror(outfile, GOT_ERR_IO);
220 			if (csum)
221 				csum_output(csum, zb->outbuf, avail);
222 			if (outlenp)
223 				*outlenp += avail;
224 		}
225 	} while (ret != Z_STREAM_END);
226 
227 	zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
228 	return NULL;
229 }
230 
231 void
232 got_deflate_end(struct got_deflate_buf *zb)
233 {
234 	free(zb->inbuf);
235 	if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
236 		free(zb->outbuf);
237 	deflateEnd(&zb->z);
238 }
239 
240 const struct got_error *
241 got_deflate_to_fd(off_t *outlen, FILE *infile, off_t len, int outfd,
242     struct got_deflate_checksum *csum)
243 {
244 	const struct got_error *err;
245 	size_t avail;
246 	off_t consumed;
247 	struct got_deflate_buf zb;
248 
249 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
250 	if (err)
251 		goto done;
252 
253 	*outlen = 0;
254 
255 	do {
256 		err = got_deflate_read(&zb, infile, len, &avail, &consumed);
257 		if (err)
258 			goto done;
259 		len -= consumed;
260 		if (avail > 0) {
261 			err = got_poll_write_full(outfd, zb.outbuf, avail);
262 			if (err)
263 				goto done;
264 			if (csum)
265 				csum_output(csum, zb.outbuf, avail);
266 			*outlen += avail;
267 		}
268 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
269 
270 done:
271 	got_deflate_end(&zb);
272 	return err;
273 }
274 
275 const struct got_error *
276 got_deflate_to_fd_mmap(off_t *outlen, uint8_t *map, size_t offset,
277     size_t len, int outfd, struct got_deflate_checksum *csum)
278 {
279 	const struct got_error *err;
280 	size_t avail, consumed;
281 	struct got_deflate_buf zb;
282 
283 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
284 	if (err)
285 		goto done;
286 
287 	*outlen = 0;
288 	do {
289 		err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
290 		    &consumed);
291 		if (err)
292 			goto done;
293 		offset += consumed;
294 		len -= consumed;
295 		if (avail > 0) {
296 			err = got_poll_write_full(outfd, zb.outbuf, avail);
297 			if (err)
298 				goto done;
299 			if (csum)
300 				csum_output(csum, zb.outbuf, avail);
301 			*outlen += avail;
302 		}
303 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
304 
305 done:
306 	got_deflate_end(&zb);
307 	return err;
308 }
309 
310 const struct got_error *
311 got_deflate_to_file(off_t *outlen, FILE *infile, off_t len,
312     FILE *outfile, struct got_deflate_checksum *csum)
313 {
314 	const struct got_error *err;
315 	size_t avail;
316 	off_t consumed;
317 	struct got_deflate_buf zb;
318 
319 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
320 	if (err)
321 		goto done;
322 
323 	*outlen = 0;
324 
325 	do {
326 		err = got_deflate_read(&zb, infile, len, &avail, &consumed);
327 		if (err)
328 			goto done;
329 		len -= consumed;
330 		if (avail > 0) {
331 			size_t n;
332 			n = fwrite(zb.outbuf, avail, 1, outfile);
333 			if (n != 1) {
334 				err = got_ferror(outfile, GOT_ERR_IO);
335 				goto done;
336 			}
337 			if (csum)
338 				csum_output(csum, zb.outbuf, avail);
339 			*outlen += avail;
340 		}
341 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
342 
343 done:
344 	got_deflate_end(&zb);
345 	return err;
346 }
347 
348 const struct got_error *
349 got_deflate_to_file_mmap(off_t *outlen, uint8_t *map, size_t offset,
350     size_t len, FILE *outfile, struct got_deflate_checksum *csum)
351 {
352 	const struct got_error *err;
353 	size_t avail, consumed;
354 	struct got_deflate_buf zb;
355 
356 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
357 	if (err)
358 		goto done;
359 
360 	*outlen = 0;
361 	do {
362 		err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
363 		    &consumed);
364 		if (err)
365 			goto done;
366 		offset += consumed;
367 		len -= consumed;
368 		if (avail > 0) {
369 			size_t n;
370 			n = fwrite(zb.outbuf, avail, 1, outfile);
371 			if (n != 1) {
372 				err = got_ferror(outfile, GOT_ERR_IO);
373 				goto done;
374 			}
375 			if (csum)
376 				csum_output(csum, zb.outbuf, avail);
377 			*outlen += avail;
378 		}
379 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
380 
381 done:
382 	got_deflate_end(&zb);
383 	return err;
384 }
385 
386 const struct got_error *
387 got_deflate_append_to_file_mmap(struct got_deflate_buf *zb, off_t *outlen,
388     uint8_t *map, size_t offset, size_t len, FILE *outfile,
389     struct got_deflate_checksum *csum)
390 {
391 	const struct got_error *err;
392 	size_t avail, consumed;
393 
394 	do {
395 		err = deflate_read_mmap(zb, map, offset, len, &avail,
396 		    &consumed, 0);
397 		if (err)
398 			break;
399 		offset += consumed;
400 		len -= consumed;
401 		if (avail > 0) {
402 			size_t n;
403 			n = fwrite(zb->outbuf, avail, 1, outfile);
404 			if (n != 1) {
405 				err = got_ferror(outfile, GOT_ERR_IO);
406 				break;
407 			}
408 			if (csum)
409 				csum_output(csum, zb->outbuf, avail);
410 			if (outlen)
411 				*outlen += avail;
412 		}
413 	} while ((zb->flags & GOT_DEFLATE_F_HAVE_MORE) && len > 0);
414 
415 	return err;
416 }
417 
418 const struct got_error *
419 got_deflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
420     size_t *consumed_total, struct got_deflate_checksum *csum, uint8_t *map,
421     size_t offset, size_t len)
422 {
423 	const struct got_error *err;
424 	size_t avail, consumed;
425 	struct got_deflate_buf zb;
426 	void *newbuf;
427 	size_t nbuf = 1;
428 
429 	if (outbuf) {
430 		*outbuf = malloc(GOT_DEFLATE_BUFSIZE);
431 		if (*outbuf == NULL)
432 			return got_error_from_errno("malloc");
433 		err = got_deflate_init(&zb, *outbuf, GOT_DEFLATE_BUFSIZE);
434 		if (err) {
435 			free(*outbuf);
436 			*outbuf = NULL;
437 			return err;
438 		}
439 	} else {
440 		err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
441 		if (err)
442 			return err;
443 	}
444 
445 	*outlen = 0;
446 	if (consumed_total)
447 		*consumed_total = 0;
448 	do {
449 		err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
450 		    &consumed);
451 		if (err)
452 			goto done;
453 		offset += consumed;
454 		if (consumed_total)
455 			*consumed_total += consumed;
456 		len -= consumed;
457 		if (avail > 0 && csum)
458 			csum_output(csum, zb.outbuf, avail);
459 		*outlen += avail;
460 		if ((zb.flags & GOT_DEFLATE_F_HAVE_MORE) && outbuf != NULL) {
461 			newbuf = reallocarray(*outbuf, ++nbuf,
462 			    GOT_DEFLATE_BUFSIZE);
463 			if (newbuf == NULL) {
464 				err = got_error_from_errno("reallocarray");
465 				free(*outbuf);
466 				*outbuf = NULL;
467 				*outlen = 0;
468 				goto done;
469 			}
470 			*outbuf = newbuf;
471 			zb.outbuf = newbuf + *outlen;
472 			zb.outlen = (nbuf * GOT_DEFLATE_BUFSIZE) - *outlen;
473 		}
474 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
475 done:
476 	got_deflate_end(&zb);
477 	return err;
478 }