2 efd2a263 2018-01-19 stsp * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4 efd2a263 2018-01-19 stsp * Permission to use, copy, modify, and distribute this software for any
5 efd2a263 2018-01-19 stsp * purpose with or without fee is hereby granted, provided that the above
6 efd2a263 2018-01-19 stsp * copyright notice and this permission notice appear in all copies.
8 efd2a263 2018-01-19 stsp * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 efd2a263 2018-01-19 stsp * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 efd2a263 2018-01-19 stsp * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 efd2a263 2018-01-19 stsp * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 efd2a263 2018-01-19 stsp * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 efd2a263 2018-01-19 stsp * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 efd2a263 2018-01-19 stsp * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 efd2a263 2018-01-19 stsp #include <sys/queue.h>
19 efd2a263 2018-01-19 stsp #include <stdio.h>
20 96f5e8b3 2018-01-23 stsp #include <stdlib.h>
21 b2f7af54 2018-11-11 stsp #include <stdint.h>
22 96f5e8b3 2018-01-23 stsp #include <string.h>
23 56e0773d 2019-11-28 stsp #include <limits.h>
24 efd2a263 2018-01-19 stsp #include <zlib.h>
25 efd2a263 2018-01-19 stsp #include <sha1.h>
26 788c352e 2018-06-16 stsp #include <time.h>
27 15a94983 2018-12-23 stsp #include <zlib.h>
29 efd2a263 2018-01-19 stsp #include "got_error.h"
30 efd2a263 2018-01-19 stsp #include "got_repository.h"
31 efd2a263 2018-01-19 stsp #include "got_object.h"
32 324d37e7 2019-05-11 stsp #include "got_path.h"
34 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
35 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
36 15a94983 2018-12-23 stsp #include "got_lib_object.h"
39 885d3e02 2018-01-27 stsp #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
42 c3703302 2018-01-23 stsp struct got_delta *
43 c336f889 2018-07-23 stsp got_delta_open(off_t offset, size_t tslen, int type, size_t size,
44 42c69117 2019-11-10 stsp off_t data_offset)
46 c3703302 2018-01-23 stsp struct got_delta *delta;
48 14118581 2018-11-05 stsp delta = malloc(sizeof(*delta));
49 c3703302 2018-01-23 stsp if (delta == NULL)
50 96f5e8b3 2018-01-23 stsp return NULL;
52 c3703302 2018-01-23 stsp delta->type = type;
53 c3703302 2018-01-23 stsp delta->offset = offset;
54 0e22967e 2018-02-11 stsp delta->tslen = tslen;
55 c3703302 2018-01-23 stsp delta->size = size;
56 bdd2fbb3 2018-02-11 stsp delta->data_offset = data_offset;
57 c3703302 2018-01-23 stsp return delta;
60 efd2a263 2018-01-19 stsp const struct got_error *
61 96f5e8b3 2018-01-23 stsp got_delta_chain_get_base_type(int *type, struct got_delta_chain *deltas)
63 c3703302 2018-01-23 stsp struct got_delta *delta;
65 6691714a 2018-01-23 stsp /* The first delta in the chain should represent the base object. */
66 6691714a 2018-01-23 stsp delta = SIMPLEQ_FIRST(&deltas->entries);
67 6691714a 2018-01-23 stsp if (delta->type == GOT_OBJ_TYPE_COMMIT ||
68 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TREE ||
69 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_BLOB ||
70 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TAG) {
71 6691714a 2018-01-23 stsp *type = delta->type;
72 6691714a 2018-01-23 stsp return NULL;
75 96f5e8b3 2018-01-23 stsp return got_error(GOT_ERR_BAD_DELTA_CHAIN);
78 885d3e02 2018-01-27 stsp /* Fetch another (required) byte from the delta stream. */
79 885d3e02 2018-01-27 stsp static const struct got_error *
80 885d3e02 2018-01-27 stsp next_delta_byte(const uint8_t **p, size_t *remain)
82 885d3e02 2018-01-27 stsp if (--(*remain) == 0)
83 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
85 885d3e02 2018-01-27 stsp return NULL;
88 885d3e02 2018-01-27 stsp static const struct got_error *
89 885d3e02 2018-01-27 stsp parse_size(uint64_t *size, const uint8_t **p, size_t *remain)
91 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
96 885d3e02 2018-01-27 stsp /* We do not support size values which don't fit in 64 bit. */
98 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_NO_SPACE);
100 885d3e02 2018-01-27 stsp if (i == 0)
101 885d3e02 2018-01-27 stsp *size = ((**p) & GOT_DELTA_SIZE_VAL_MASK);
103 885d3e02 2018-01-27 stsp size_t shift = GOT_DELTA_SIZE_SHIFT * i;
104 885d3e02 2018-01-27 stsp *size |= (((**p) & GOT_DELTA_SIZE_VAL_MASK) << shift);
107 885d3e02 2018-01-27 stsp if (((**p) & GOT_DELTA_SIZE_MORE) == 0)
110 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
111 885d3e02 2018-01-27 stsp } while (err == NULL);
113 885d3e02 2018-01-27 stsp return err;
116 885d3e02 2018-01-27 stsp static const struct got_error *
117 885d3e02 2018-01-27 stsp parse_opcode(off_t *offset, size_t *len, const uint8_t **p, size_t *remain)
119 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
120 885d3e02 2018-01-27 stsp off_t o = 0;
121 885d3e02 2018-01-27 stsp size_t l = 0;
122 885d3e02 2018-01-27 stsp uint8_t opcode = **p;
124 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF1) {
125 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
127 885d3e02 2018-01-27 stsp return err;
128 885d3e02 2018-01-27 stsp o = (off_t)(**p);
130 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF2) {
131 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
133 885d3e02 2018-01-27 stsp return err;
134 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 8;
136 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF3) {
137 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
139 885d3e02 2018-01-27 stsp return err;
140 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 16;
142 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF4) {
143 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
145 885d3e02 2018-01-27 stsp return err;
146 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 24;
149 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN1) {
150 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
152 885d3e02 2018-01-27 stsp return err;
153 885d3e02 2018-01-27 stsp l = (off_t)(**p);
155 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN2) {
156 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
158 885d3e02 2018-01-27 stsp return err;
159 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 8;
161 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN3) {
162 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
164 885d3e02 2018-01-27 stsp return err;
165 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 16;
168 885d3e02 2018-01-27 stsp if (o == 0)
169 885d3e02 2018-01-27 stsp o = GOT_DELTA_COPY_DEFAULT_OFF;
170 885d3e02 2018-01-27 stsp if (l == 0)
171 885d3e02 2018-01-27 stsp l = GOT_DELTA_COPY_DEFAULT_LEN;
173 885d3e02 2018-01-27 stsp *offset = o;
175 885d3e02 2018-01-27 stsp return NULL;
178 885d3e02 2018-01-27 stsp static const struct got_error *
179 885d3e02 2018-01-27 stsp copy_from_base(FILE *base_file, off_t offset, size_t size, FILE *outfile)
181 885d3e02 2018-01-27 stsp if (fseeko(base_file, offset, SEEK_SET) != 0)
182 638f9024 2019-05-13 stsp return got_error_from_errno("fseeko");
184 885d3e02 2018-01-27 stsp while (size > 0) {
185 885d3e02 2018-01-27 stsp uint8_t data[2048];
186 885d3e02 2018-01-27 stsp size_t len = MIN(size, sizeof(data));
189 885d3e02 2018-01-27 stsp n = fread(data, len, 1, base_file);
190 885d3e02 2018-01-27 stsp if (n != 1)
191 885d3e02 2018-01-27 stsp return got_ferror(base_file, GOT_ERR_IO);
193 885d3e02 2018-01-27 stsp n = fwrite(data, len, 1, outfile);
194 885d3e02 2018-01-27 stsp if (n != 1)
195 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
197 885d3e02 2018-01-27 stsp size -= len;
200 885d3e02 2018-01-27 stsp return NULL;
203 885d3e02 2018-01-27 stsp static const struct got_error *
204 885d3e02 2018-01-27 stsp copy_from_delta(const uint8_t **p, size_t *remain, size_t len, FILE *outfile)
208 885d3e02 2018-01-27 stsp if (*remain < len)
209 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
211 885d3e02 2018-01-27 stsp n = fwrite(*p, len, 1, outfile);
212 885d3e02 2018-01-27 stsp if (n != 1)
213 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
216 885d3e02 2018-01-27 stsp *remain -= len;
217 885d3e02 2018-01-27 stsp return NULL;
220 22484865 2018-03-13 stsp static const struct got_error *
221 22484865 2018-03-13 stsp parse_delta_sizes(uint64_t *base_size, uint64_t *result_size,
222 22484865 2018-03-13 stsp const uint8_t **p, size_t *remain)
224 22484865 2018-03-13 stsp const struct got_error *err;
226 22484865 2018-03-13 stsp /* Read the two size fields at the beginning of the stream. */
227 22484865 2018-03-13 stsp err = parse_size(base_size, p, remain);
229 22484865 2018-03-13 stsp return err;
230 22484865 2018-03-13 stsp err = next_delta_byte(p, remain);
232 22484865 2018-03-13 stsp return err;
233 22484865 2018-03-13 stsp err = parse_size(result_size, p, remain);
235 22484865 2018-03-13 stsp return err;
237 22484865 2018-03-13 stsp return NULL;
240 885d3e02 2018-01-27 stsp const struct got_error *
241 22484865 2018-03-13 stsp got_delta_get_sizes(uint64_t *base_size, uint64_t *result_size,
242 22484865 2018-03-13 stsp const uint8_t *delta_buf, size_t delta_len)
244 22484865 2018-03-13 stsp size_t remain;
245 22484865 2018-03-13 stsp const uint8_t *p;
247 22484865 2018-03-13 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
248 22484865 2018-03-13 stsp return got_error(GOT_ERR_BAD_DELTA);
250 22484865 2018-03-13 stsp p = delta_buf;
251 22484865 2018-03-13 stsp remain = delta_len;
252 22484865 2018-03-13 stsp return parse_delta_sizes(base_size, result_size, &p, &remain);
255 8628c62d 2018-03-15 stsp const struct got_error *
256 34fca9c3 2018-11-11 stsp got_delta_apply_in_mem(uint8_t *base_buf, size_t base_bufsz,
257 34fca9c3 2018-11-11 stsp const uint8_t *delta_buf, size_t delta_len, uint8_t *outbuf,
258 34fca9c3 2018-11-11 stsp size_t *outsize, size_t maxoutsize)
260 8628c62d 2018-03-15 stsp const struct got_error *err = NULL;
261 8628c62d 2018-03-15 stsp uint64_t base_size, result_size;
262 8628c62d 2018-03-15 stsp size_t remain;
263 8628c62d 2018-03-15 stsp const uint8_t *p;
265 8628c62d 2018-03-15 stsp *outsize= 0;
267 8628c62d 2018-03-15 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
268 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
270 8628c62d 2018-03-15 stsp p = delta_buf;
271 8628c62d 2018-03-15 stsp remain = delta_len;
272 8628c62d 2018-03-15 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
274 8628c62d 2018-03-15 stsp return err;
276 8628c62d 2018-03-15 stsp /* Decode and execute copy instructions from the delta stream. */
277 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
278 8628c62d 2018-03-15 stsp while (err == NULL && remain > 0) {
279 8628c62d 2018-03-15 stsp if (*p & GOT_DELTA_BASE_COPY) {
280 8628c62d 2018-03-15 stsp off_t offset = 0;
281 8628c62d 2018-03-15 stsp size_t len = 0;
282 8628c62d 2018-03-15 stsp err = parse_opcode(&offset, &len, &p, &remain);
285 b2f7af54 2018-11-11 stsp if (SIZE_MAX - offset < len || offset + len < 0 ||
286 b2f7af54 2018-11-11 stsp base_bufsz < offset + len ||
287 34fca9c3 2018-11-11 stsp *outsize + len > maxoutsize)
288 34fca9c3 2018-11-11 stsp return got_error(GOT_ERR_BAD_DELTA);
289 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, base_buf + offset, len);
290 8628c62d 2018-03-15 stsp if (err == NULL) {
291 8628c62d 2018-03-15 stsp *outsize += len;
292 8628c62d 2018-03-15 stsp if (remain > 0) {
298 8628c62d 2018-03-15 stsp size_t len = (size_t)*p;
299 8628c62d 2018-03-15 stsp if (len == 0) {
300 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
303 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
306 b2f7af54 2018-11-11 stsp if (remain < len || SIZE_MAX - *outsize < len ||
307 b2f7af54 2018-11-11 stsp *outsize + len > maxoutsize)
308 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
309 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, p, len);
311 8628c62d 2018-03-15 stsp remain -= len;
312 8628c62d 2018-03-15 stsp *outsize += len;
316 8628c62d 2018-03-15 stsp if (*outsize != result_size)
317 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
318 8628c62d 2018-03-15 stsp return err;
321 22484865 2018-03-13 stsp const struct got_error *
322 0e22967e 2018-02-11 stsp got_delta_apply(FILE *base_file, const uint8_t *delta_buf,
323 b29656e2 2018-03-16 stsp size_t delta_len, FILE *outfile, size_t *outsize)
325 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
326 885d3e02 2018-01-27 stsp uint64_t base_size, result_size;
327 b29656e2 2018-03-16 stsp size_t remain = 0;
328 885d3e02 2018-01-27 stsp const uint8_t *p;
329 39ff877f 2018-03-13 stsp FILE *memstream = NULL;
330 39ff877f 2018-03-13 stsp char *memstream_buf = NULL;
331 39ff877f 2018-03-13 stsp size_t memstream_size = 0;
333 b29656e2 2018-03-16 stsp *outsize = 0;
335 885d3e02 2018-01-27 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
336 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
338 885d3e02 2018-01-27 stsp p = delta_buf;
339 885d3e02 2018-01-27 stsp remain = delta_len;
340 22484865 2018-03-13 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
342 885d3e02 2018-01-27 stsp return err;
344 39ff877f 2018-03-13 stsp if (result_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX)
345 39ff877f 2018-03-13 stsp memstream = open_memstream(&memstream_buf, &memstream_size);
347 885d3e02 2018-01-27 stsp /* Decode and execute copy instructions from the delta stream. */
348 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
349 06e5fc98 2018-02-11 stsp while (err == NULL && remain > 0) {
350 824801e7 2018-01-27 stsp if (*p & GOT_DELTA_BASE_COPY) {
351 885d3e02 2018-01-27 stsp off_t offset = 0;
352 885d3e02 2018-01-27 stsp size_t len = 0;
353 885d3e02 2018-01-27 stsp err = parse_opcode(&offset, &len, &p, &remain);
356 39ff877f 2018-03-13 stsp err = copy_from_base(base_file, offset, len,
357 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
358 06e5fc98 2018-02-11 stsp if (err == NULL) {
359 b29656e2 2018-03-16 stsp *outsize += len;
360 06e5fc98 2018-02-11 stsp if (remain > 0) {
366 885d3e02 2018-01-27 stsp size_t len = (size_t)*p;
367 885d3e02 2018-01-27 stsp if (len == 0) {
368 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
371 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
374 39ff877f 2018-03-13 stsp err = copy_from_delta(&p, &remain, len,
375 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
376 885d3e02 2018-01-27 stsp if (err == NULL)
377 b29656e2 2018-03-16 stsp *outsize += len;
381 b29656e2 2018-03-16 stsp if (*outsize != result_size)
382 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
384 39ff877f 2018-03-13 stsp if (memstream != NULL) {
385 fb43ecf1 2019-02-11 stsp if (fclose(memstream) != 0)
386 638f9024 2019-05-13 stsp err = got_error_from_errno("fclose");
387 39ff877f 2018-03-13 stsp if (err == NULL) {
389 39ff877f 2018-03-13 stsp n = fwrite(memstream_buf, 1, memstream_size, outfile);
390 39ff877f 2018-03-13 stsp if (n != memstream_size)
391 39ff877f 2018-03-13 stsp err = got_ferror(outfile, GOT_ERR_IO);
393 39ff877f 2018-03-13 stsp free(memstream_buf);
395 885d3e02 2018-01-27 stsp if (err == NULL)
396 885d3e02 2018-01-27 stsp rewind(outfile);
397 885d3e02 2018-01-27 stsp return err;