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Date:: Sat May 11 17:05:57 2019 UTC
Message:: got_error_from_errno -> got_error_prefix_errno also add got_error_prefix_errno2 and got_error_prefix_errno3 which should hopefully all be merged into a single function with variadic args (but can't alloc mem)
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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 #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 <zlib.h>
25 #include <time.h>
26 
27 #include "got_error.h"
28 #include "got_object.h"
29 #include "got_path.h"
30 
31 #include "got_lib_inflate.h"
32 
33 #ifndef MIN
34 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
35 #endif
36 
37 const struct got_error *
38 got_inflate_init(struct got_inflate_buf *zb, uint8_t *outbuf, size_t bufsize)
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_prefix_errno("inflateInit");
51 		if  (zerr == Z_MEM_ERROR) {
52 			errno = ENOMEM;
53 			return got_error_prefix_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_prefix_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_prefix_errno("calloc");
71 			goto done;
72 		}
73 		zb->flags |= GOT_INFLATE_F_OWN_OUTBUF;
74 	} else
75 		zb->outbuf = outbuf;
76 
77 done:
78 	if (err)
79 		got_inflate_end(zb);
80 	return err;
81 }
82 
83 const struct got_error *
84 got_inflate_read(struct got_inflate_buf *zb, FILE *f, size_t *outlenp)
85 {
86 	size_t last_total_out = zb->z.total_out;
87 	z_stream *z = &zb->z;
88 	int ret = Z_ERRNO;
89 
90 	z->next_out = zb->outbuf;
91 	z->avail_out = zb->outlen;
92 
93 	*outlenp = 0;
94 	do {
95 		if (z->avail_in == 0) {
96 			size_t n = fread(zb->inbuf, 1, zb->inlen, f);
97 			if (n == 0) {
98 				if (ferror(f))
99 					return got_ferror(f, GOT_ERR_IO);
100 				/* EOF */
101 				ret = Z_STREAM_END;
102 				break;
103 			}
104 			z->next_in = zb->inbuf;
105 			z->avail_in = n;
106 		}
107 		ret = inflate(z, Z_SYNC_FLUSH);
108 	} while (ret == Z_OK && z->avail_out > 0);
109 
110 	if (ret == Z_OK) {
111 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
112 	} else {
113 		if (ret != Z_STREAM_END)
114 			return got_error(GOT_ERR_DECOMPRESSION);
115 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
116 	}
117 
118 	*outlenp = z->total_out - last_total_out;
119 	return NULL;
120 }
121 
122 const struct got_error *
123 got_inflate_read_fd(struct got_inflate_buf *zb, int fd, size_t *outlenp)
124 {
125 	size_t last_total_out = zb->z.total_out;
126 	z_stream *z = &zb->z;
127 	int ret = Z_ERRNO;
128 
129 	z->next_out = zb->outbuf;
130 	z->avail_out = zb->outlen;
131 
132 	*outlenp = 0;
133 	do {
134 		if (z->avail_in == 0) {
135 			ssize_t n = read(fd, zb->inbuf, zb->inlen);
136 			if (n < 0)
137 				return got_error_prefix_errno("read");
138 			else if (n == 0) {
139 				/* EOF */
140 				ret = Z_STREAM_END;
141 				break;
142 			}
143 			z->next_in = zb->inbuf;
144 			z->avail_in = n;
145 		}
146 		ret = inflate(z, Z_SYNC_FLUSH);
147 	} while (ret == Z_OK && z->avail_out > 0);
148 
149 	if (ret == Z_OK) {
150 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
151 	} else {
152 		if (ret != Z_STREAM_END)
153 			return got_error(GOT_ERR_DECOMPRESSION);
154 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
155 	}
156 
157 	*outlenp = z->total_out - last_total_out;
158 	return NULL;
159 }
160 
161 const struct got_error *
162 got_inflate_read_mmap(struct got_inflate_buf *zb, uint8_t *map, size_t offset,
163     size_t len, size_t *outlenp, size_t *consumed)
164 {
165 	size_t last_total_out = zb->z.total_out;
166 	z_stream *z = &zb->z;
167 	int ret = Z_ERRNO;
168 
169 	z->next_out = zb->outbuf;
170 	z->avail_out = zb->outlen;
171 
172 	*outlenp = 0;
173 	*consumed = 0;
174 
175 	do {
176 		size_t last_total_in = zb->z.total_in;
177 		if (z->avail_in == 0) {
178 			if (len == 0) {
179 				/* EOF */
180 				ret = Z_STREAM_END;
181 				break;
182 			}
183 			z->next_in = map + offset + *consumed;
184 			z->avail_in = MIN(zb->inlen, len);
185 			len -= z->avail_in;
186 		}
187 		ret = inflate(z, Z_SYNC_FLUSH);
188 		*consumed += z->total_in - last_total_in;
189 	} while (ret == Z_OK && z->avail_out > 0);
190 
191 	if (ret == Z_OK) {
192 		zb->flags |= GOT_INFLATE_F_HAVE_MORE;
193 	} else {
194 		if (ret != Z_STREAM_END)
195 			return got_error(GOT_ERR_DECOMPRESSION);
196 		zb->flags &= ~GOT_INFLATE_F_HAVE_MORE;
197 	}
198 
199 	*outlenp = z->total_out - last_total_out;
200 	return NULL;
201 }
202 
203 void
204 got_inflate_end(struct got_inflate_buf *zb)
205 {
206 	free(zb->inbuf);
207 	if (zb->flags & GOT_INFLATE_F_OWN_OUTBUF)
208 		free(zb->outbuf);
209 	inflateEnd(&zb->z);
210 }
211 
212 const struct got_error *
213 got_inflate_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
214 {
215 	const struct got_error *err;
216 	size_t avail;
217 	struct got_inflate_buf zb;
218 	void *newbuf;
219 	int nbuf = 1;
220 
221 	*outbuf = calloc(1, GOT_INFLATE_BUFSIZE);
222 	if (*outbuf == NULL)
223 		return got_error_prefix_errno("calloc");
224 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
225 	if (err)
226 		return err;
227 
228 	*outlen = 0;
229 
230 	do {
231 		err = got_inflate_read(&zb, f, &avail);
232 		if (err)
233 			goto done;
234 		*outlen += avail;
235 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
236 			nbuf++;
237 			newbuf = recallocarray(*outbuf, nbuf - 1, nbuf,
238 			   GOT_INFLATE_BUFSIZE);
239 			if (newbuf == NULL) {
240 				err = got_error_prefix_errno("recallocarray");
241 				free(*outbuf);
242 				*outbuf = NULL;
243 				*outlen = 0;
244 				goto done;
245 			}
246 			*outbuf = newbuf;
247 			zb.outbuf = newbuf + *outlen;
248 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
249 		}
250 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
251 
252 done:
253 	got_inflate_end(&zb);
254 	return err;
255 }
256 
257 const struct got_error *
258 got_inflate_to_mem_fd(uint8_t **outbuf, size_t *outlen, int infd)
259 {
260 	const struct got_error *err;
261 	size_t avail;
262 	struct got_inflate_buf zb;
263 	void *newbuf;
264 	int nbuf = 1;
265 
266 	*outbuf = calloc(1, GOT_INFLATE_BUFSIZE);
267 	if (*outbuf == NULL)
268 		return got_error_prefix_errno("calloc");
269 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
270 	if (err)
271 		goto done;
272 
273 	*outlen = 0;
274 
275 	do {
276 		err = got_inflate_read_fd(&zb, infd, &avail);
277 		if (err)
278 			goto done;
279 		*outlen += avail;
280 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
281 			nbuf++;
282 			newbuf = recallocarray(*outbuf, nbuf - 1, nbuf,
283 			    GOT_INFLATE_BUFSIZE);
284 			if (newbuf == NULL) {
285 				err = got_error_prefix_errno("recallocarray");
286 				free(*outbuf);
287 				*outbuf = NULL;
288 				*outlen = 0;
289 				goto done;
290 			}
291 			*outbuf = newbuf;
292 			zb.outbuf = newbuf + *outlen;
293 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
294 		}
295 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
296 
297 done:
298 	got_inflate_end(&zb);
299 	return err;
300 }
301 
302 const struct got_error *
303 got_inflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen, uint8_t *map,
304     size_t offset, size_t len)
305 {
306 	const struct got_error *err;
307 	size_t avail, consumed;
308 	struct got_inflate_buf zb;
309 	void *newbuf;
310 	int nbuf = 1;
311 
312 	*outbuf = calloc(1, GOT_INFLATE_BUFSIZE);
313 	if (*outbuf == NULL)
314 		return got_error_prefix_errno("calloc");
315 	err = got_inflate_init(&zb, *outbuf, GOT_INFLATE_BUFSIZE);
316 	if (err) {
317 		free(*outbuf);
318 		*outbuf = NULL;
319 		return err;
320 	}
321 
322 	*outlen = 0;
323 
324 	do {
325 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
326 		    &consumed);
327 		if (err)
328 			goto done;
329 		offset += consumed;
330 		len -= consumed;
331 		*outlen += avail;
332 		if (len == 0)
333 			break;
334 		if (zb.flags & GOT_INFLATE_F_HAVE_MORE) {
335 			nbuf++;
336 			newbuf = recallocarray(*outbuf, nbuf - 1, nbuf,
337 			    GOT_INFLATE_BUFSIZE);
338 			if (newbuf == NULL) {
339 				err = got_error_prefix_errno("recallocarray");
340 				free(*outbuf);
341 				*outbuf = NULL;
342 				*outlen = 0;
343 				goto done;
344 			}
345 			*outbuf = newbuf;
346 			zb.outbuf = newbuf + *outlen;
347 			zb.outlen = (nbuf * GOT_INFLATE_BUFSIZE) - *outlen;
348 		}
349 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
350 done:
351 	got_inflate_end(&zb);
352 	return err;
353 }
354 
355 const struct got_error *
356 got_inflate_to_fd(size_t *outlen, FILE *infile, int outfd)
357 {
358 	const struct got_error *err = NULL;
359 	size_t avail;
360 	struct got_inflate_buf zb;
361 
362 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
363 	if (err)
364 		goto done;
365 
366 	*outlen = 0;
367 
368 	do {
369 		err = got_inflate_read(&zb, infile, &avail);
370 		if (err)
371 			goto done;
372 		if (avail > 0) {
373 			ssize_t n;
374 			n = write(outfd, zb.outbuf, avail);
375 			if (n != avail) {
376 				err = got_error_prefix_errno("write");
377 				goto done;
378 			}
379 			*outlen += avail;
380 		}
381 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
382 
383 done:
384 	if (err == NULL) {
385 		if (lseek(outfd, SEEK_SET, 0) == -1)
386 			err = got_error_prefix_errno("lseek");
387 	}
388 	got_inflate_end(&zb);
389 	return err;
390 }
391 
392 const struct got_error *
393 got_inflate_to_file(size_t *outlen, FILE *infile, FILE *outfile)
394 {
395 	const struct got_error *err;
396 	size_t avail;
397 	struct got_inflate_buf zb;
398 
399 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
400 	if (err)
401 		goto done;
402 
403 	*outlen = 0;
404 
405 	do {
406 		err = got_inflate_read(&zb, infile, &avail);
407 		if (err)
408 			goto done;
409 		if (avail > 0) {
410 			size_t n;
411 			n = fwrite(zb.outbuf, avail, 1, outfile);
412 			if (n != 1) {
413 				err = got_ferror(outfile, GOT_ERR_IO);
414 				goto done;
415 			}
416 			*outlen += avail;
417 		}
418 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
419 
420 done:
421 	if (err == NULL)
422 		rewind(outfile);
423 	got_inflate_end(&zb);
424 	return err;
425 }
426 
427 const struct got_error *
428 got_inflate_to_file_fd(size_t *outlen, int infd, FILE *outfile)
429 {
430 	const struct got_error *err;
431 	size_t avail;
432 	struct got_inflate_buf zb;
433 
434 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
435 	if (err)
436 		goto done;
437 
438 	*outlen = 0;
439 
440 	do {
441 		err = got_inflate_read_fd(&zb, infd, &avail);
442 		if (err)
443 			goto done;
444 		if (avail > 0) {
445 			size_t n;
446 			n = fwrite(zb.outbuf, avail, 1, outfile);
447 			if (n != 1) {
448 				err = got_ferror(outfile, GOT_ERR_IO);
449 				goto done;
450 			}
451 			*outlen += avail;
452 		}
453 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
454 
455 done:
456 	if (err == NULL)
457 		rewind(outfile);
458 	got_inflate_end(&zb);
459 	return err;
460 }
461 
462 const struct got_error *
463 got_inflate_to_file_mmap(size_t *outlen, uint8_t *map, size_t offset,
464     size_t len, FILE *outfile)
465 {
466 	const struct got_error *err;
467 	size_t avail;
468 	struct got_inflate_buf zb;
469 	size_t consumed;
470 
471 	err = got_inflate_init(&zb, NULL, GOT_INFLATE_BUFSIZE);
472 	if (err)
473 		goto done;
474 
475 	*outlen = 0;
476 
477 	do {
478 		err = got_inflate_read_mmap(&zb, map, offset, len, &avail,
479 		    &consumed);
480 		if (err)
481 			goto done;
482 		offset += consumed;
483 		len -= consumed;
484 		if (avail > 0) {
485 			size_t n;
486 			n = fwrite(zb.outbuf, avail, 1, outfile);
487 			if (n != 1) {
488 				err = got_ferror(outfile, GOT_ERR_IO);
489 				goto done;
490 			}
491 			*outlen += avail;
492 		}
493 	} while (zb.flags & GOT_INFLATE_F_HAVE_MORE);
494 
495 done:
496 	if (err == NULL)
497 		rewind(outfile);
498 	got_inflate_end(&zb);
499 	return err;
500 }