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 96f5e8b3 2018-01-23 stsp #include <string.h>
22 efd2a263 2018-01-19 stsp #include <zlib.h>
23 efd2a263 2018-01-19 stsp #include <sha1.h>
24 788c352e 2018-06-16 stsp #include <time.h>
26 efd2a263 2018-01-19 stsp #include "got_error.h"
27 efd2a263 2018-01-19 stsp #include "got_repository.h"
28 efd2a263 2018-01-19 stsp #include "got_object.h"
30 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
31 718b3ab0 2018-03-17 stsp #include "got_lib_path.h"
32 718b3ab0 2018-03-17 stsp #include "got_lib_zbuf.h"
35 885d3e02 2018-01-27 stsp #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
38 c3703302 2018-01-23 stsp struct got_delta *
39 0e22967e 2018-02-11 stsp got_delta_open(const char *path_packfile, off_t offset, size_t tslen,
40 a53d2f13 2018-03-17 stsp int type, size_t size, off_t data_offset, uint8_t *delta_buf,
41 a53d2f13 2018-03-17 stsp size_t delta_len)
43 c3703302 2018-01-23 stsp struct got_delta *delta;
45 c3703302 2018-01-23 stsp delta = calloc(1, sizeof(*delta));
46 c3703302 2018-01-23 stsp if (delta == NULL)
47 96f5e8b3 2018-01-23 stsp return NULL;
49 72eb3431 2018-04-01 stsp delta->path_packfile = strdup(path_packfile);
50 72eb3431 2018-04-01 stsp if (delta->path_packfile == NULL) {
51 72eb3431 2018-04-01 stsp free(delta);
52 72eb3431 2018-04-01 stsp return NULL;
54 c3703302 2018-01-23 stsp delta->type = type;
55 c3703302 2018-01-23 stsp delta->offset = offset;
56 0e22967e 2018-02-11 stsp delta->tslen = tslen;
57 c3703302 2018-01-23 stsp delta->size = size;
58 bdd2fbb3 2018-02-11 stsp delta->data_offset = data_offset;
59 a53d2f13 2018-03-17 stsp delta->delta_buf = delta_buf;
60 a53d2f13 2018-03-17 stsp delta->delta_len = delta_len;
61 c3703302 2018-01-23 stsp return delta;
65 c3703302 2018-01-23 stsp got_delta_close(struct got_delta *delta)
67 72eb3431 2018-04-01 stsp free(delta->path_packfile);
68 a53d2f13 2018-03-17 stsp free(delta->delta_buf);
69 c3703302 2018-01-23 stsp free(delta);
72 efd2a263 2018-01-19 stsp const struct got_error *
73 96f5e8b3 2018-01-23 stsp got_delta_chain_get_base_type(int *type, struct got_delta_chain *deltas)
75 c3703302 2018-01-23 stsp struct got_delta *delta;
77 6691714a 2018-01-23 stsp /* The first delta in the chain should represent the base object. */
78 6691714a 2018-01-23 stsp delta = SIMPLEQ_FIRST(&deltas->entries);
79 6691714a 2018-01-23 stsp if (delta->type == GOT_OBJ_TYPE_COMMIT ||
80 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TREE ||
81 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_BLOB ||
82 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TAG) {
83 6691714a 2018-01-23 stsp *type = delta->type;
84 6691714a 2018-01-23 stsp return NULL;
87 96f5e8b3 2018-01-23 stsp return got_error(GOT_ERR_BAD_DELTA_CHAIN);
90 885d3e02 2018-01-27 stsp /* Fetch another (required) byte from the delta stream. */
91 885d3e02 2018-01-27 stsp static const struct got_error *
92 885d3e02 2018-01-27 stsp next_delta_byte(const uint8_t **p, size_t *remain)
94 885d3e02 2018-01-27 stsp if (--(*remain) == 0)
95 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
97 885d3e02 2018-01-27 stsp return NULL;
100 885d3e02 2018-01-27 stsp static const struct got_error *
101 885d3e02 2018-01-27 stsp parse_size(uint64_t *size, const uint8_t **p, size_t *remain)
103 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
108 885d3e02 2018-01-27 stsp /* We do not support size values which don't fit in 64 bit. */
110 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_NO_SPACE);
112 885d3e02 2018-01-27 stsp if (i == 0)
113 885d3e02 2018-01-27 stsp *size = ((**p) & GOT_DELTA_SIZE_VAL_MASK);
115 885d3e02 2018-01-27 stsp size_t shift = GOT_DELTA_SIZE_SHIFT * i;
116 885d3e02 2018-01-27 stsp *size |= (((**p) & GOT_DELTA_SIZE_VAL_MASK) << shift);
119 885d3e02 2018-01-27 stsp if (((**p) & GOT_DELTA_SIZE_MORE) == 0)
122 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
123 885d3e02 2018-01-27 stsp } while (err == NULL);
125 885d3e02 2018-01-27 stsp return err;
128 885d3e02 2018-01-27 stsp static const struct got_error *
129 885d3e02 2018-01-27 stsp parse_opcode(off_t *offset, size_t *len, const uint8_t **p, size_t *remain)
131 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
132 885d3e02 2018-01-27 stsp off_t o = 0;
133 885d3e02 2018-01-27 stsp size_t l = 0;
134 885d3e02 2018-01-27 stsp uint8_t opcode = **p;
136 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF1) {
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);
142 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF2) {
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)) << 8;
148 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF3) {
149 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
151 885d3e02 2018-01-27 stsp return err;
152 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 16;
154 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF4) {
155 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
157 885d3e02 2018-01-27 stsp return err;
158 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 24;
161 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN1) {
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);
167 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN2) {
168 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
170 885d3e02 2018-01-27 stsp return err;
171 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 8;
173 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN3) {
174 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
176 885d3e02 2018-01-27 stsp return err;
177 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 16;
180 885d3e02 2018-01-27 stsp if (o == 0)
181 885d3e02 2018-01-27 stsp o = GOT_DELTA_COPY_DEFAULT_OFF;
182 885d3e02 2018-01-27 stsp if (l == 0)
183 885d3e02 2018-01-27 stsp l = GOT_DELTA_COPY_DEFAULT_LEN;
185 885d3e02 2018-01-27 stsp *offset = o;
187 885d3e02 2018-01-27 stsp return NULL;
190 885d3e02 2018-01-27 stsp static const struct got_error *
191 885d3e02 2018-01-27 stsp copy_from_base(FILE *base_file, off_t offset, size_t size, FILE *outfile)
193 885d3e02 2018-01-27 stsp if (fseeko(base_file, offset, SEEK_SET) != 0)
194 885d3e02 2018-01-27 stsp return got_error_from_errno();
196 885d3e02 2018-01-27 stsp while (size > 0) {
197 885d3e02 2018-01-27 stsp uint8_t data[2048];
198 885d3e02 2018-01-27 stsp size_t len = MIN(size, sizeof(data));
201 885d3e02 2018-01-27 stsp n = fread(data, len, 1, base_file);
202 885d3e02 2018-01-27 stsp if (n != 1)
203 885d3e02 2018-01-27 stsp return got_ferror(base_file, GOT_ERR_IO);
205 885d3e02 2018-01-27 stsp n = fwrite(data, len, 1, outfile);
206 885d3e02 2018-01-27 stsp if (n != 1)
207 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
209 885d3e02 2018-01-27 stsp size -= len;
212 885d3e02 2018-01-27 stsp return NULL;
215 885d3e02 2018-01-27 stsp static const struct got_error *
216 885d3e02 2018-01-27 stsp copy_from_delta(const uint8_t **p, size_t *remain, size_t len, FILE *outfile)
220 885d3e02 2018-01-27 stsp if (*remain < len)
221 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
223 885d3e02 2018-01-27 stsp n = fwrite(*p, len, 1, outfile);
224 885d3e02 2018-01-27 stsp if (n != 1)
225 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
228 885d3e02 2018-01-27 stsp *remain -= len;
229 885d3e02 2018-01-27 stsp return NULL;
232 22484865 2018-03-13 stsp static const struct got_error *
233 22484865 2018-03-13 stsp parse_delta_sizes(uint64_t *base_size, uint64_t *result_size,
234 22484865 2018-03-13 stsp const uint8_t **p, size_t *remain)
236 22484865 2018-03-13 stsp const struct got_error *err;
238 22484865 2018-03-13 stsp /* Read the two size fields at the beginning of the stream. */
239 22484865 2018-03-13 stsp err = parse_size(base_size, p, remain);
241 22484865 2018-03-13 stsp return err;
242 22484865 2018-03-13 stsp err = next_delta_byte(p, remain);
244 22484865 2018-03-13 stsp return err;
245 22484865 2018-03-13 stsp err = parse_size(result_size, p, remain);
247 22484865 2018-03-13 stsp return err;
249 22484865 2018-03-13 stsp return NULL;
252 885d3e02 2018-01-27 stsp const struct got_error *
253 22484865 2018-03-13 stsp got_delta_get_sizes(uint64_t *base_size, uint64_t *result_size,
254 22484865 2018-03-13 stsp const uint8_t *delta_buf, size_t delta_len)
256 22484865 2018-03-13 stsp size_t remain;
257 22484865 2018-03-13 stsp const uint8_t *p;
259 22484865 2018-03-13 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
260 22484865 2018-03-13 stsp return got_error(GOT_ERR_BAD_DELTA);
262 22484865 2018-03-13 stsp p = delta_buf;
263 22484865 2018-03-13 stsp remain = delta_len;
264 22484865 2018-03-13 stsp return parse_delta_sizes(base_size, result_size, &p, &remain);
267 8628c62d 2018-03-15 stsp const struct got_error *
268 8628c62d 2018-03-15 stsp got_delta_apply_in_mem(uint8_t *base_buf, const uint8_t *delta_buf,
269 8628c62d 2018-03-15 stsp size_t delta_len, uint8_t *outbuf, size_t *outsize)
271 8628c62d 2018-03-15 stsp const struct got_error *err = NULL;
272 8628c62d 2018-03-15 stsp uint64_t base_size, result_size;
273 8628c62d 2018-03-15 stsp size_t remain;
274 8628c62d 2018-03-15 stsp const uint8_t *p;
276 8628c62d 2018-03-15 stsp *outsize= 0;
278 8628c62d 2018-03-15 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
279 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
281 8628c62d 2018-03-15 stsp p = delta_buf;
282 8628c62d 2018-03-15 stsp remain = delta_len;
283 8628c62d 2018-03-15 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
285 8628c62d 2018-03-15 stsp return err;
287 8628c62d 2018-03-15 stsp /* Decode and execute copy instructions from the delta stream. */
288 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
289 8628c62d 2018-03-15 stsp while (err == NULL && remain > 0) {
290 8628c62d 2018-03-15 stsp if (*p & GOT_DELTA_BASE_COPY) {
291 8628c62d 2018-03-15 stsp off_t offset = 0;
292 8628c62d 2018-03-15 stsp size_t len = 0;
293 8628c62d 2018-03-15 stsp err = parse_opcode(&offset, &len, &p, &remain);
296 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, base_buf + offset, len);
297 8628c62d 2018-03-15 stsp if (err == NULL) {
298 8628c62d 2018-03-15 stsp *outsize += len;
299 8628c62d 2018-03-15 stsp if (remain > 0) {
305 8628c62d 2018-03-15 stsp size_t len = (size_t)*p;
306 8628c62d 2018-03-15 stsp if (len == 0) {
307 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
310 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
313 8628c62d 2018-03-15 stsp if (remain < len)
314 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
315 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, p, len);
317 8628c62d 2018-03-15 stsp remain -= len;
318 8628c62d 2018-03-15 stsp *outsize += len;
322 8628c62d 2018-03-15 stsp if (*outsize != result_size)
323 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
324 8628c62d 2018-03-15 stsp return err;
327 22484865 2018-03-13 stsp const struct got_error *
328 0e22967e 2018-02-11 stsp got_delta_apply(FILE *base_file, const uint8_t *delta_buf,
329 b29656e2 2018-03-16 stsp size_t delta_len, FILE *outfile, size_t *outsize)
331 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
332 885d3e02 2018-01-27 stsp uint64_t base_size, result_size;
333 b29656e2 2018-03-16 stsp size_t remain = 0;
334 885d3e02 2018-01-27 stsp const uint8_t *p;
335 39ff877f 2018-03-13 stsp FILE *memstream = NULL;
336 39ff877f 2018-03-13 stsp char *memstream_buf = NULL;
337 39ff877f 2018-03-13 stsp size_t memstream_size = 0;
339 b29656e2 2018-03-16 stsp *outsize = 0;
341 885d3e02 2018-01-27 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
342 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
344 885d3e02 2018-01-27 stsp p = delta_buf;
345 885d3e02 2018-01-27 stsp remain = delta_len;
346 22484865 2018-03-13 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
348 885d3e02 2018-01-27 stsp return err;
350 39ff877f 2018-03-13 stsp if (result_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX)
351 39ff877f 2018-03-13 stsp memstream = open_memstream(&memstream_buf, &memstream_size);
353 885d3e02 2018-01-27 stsp /* Decode and execute copy instructions from the delta stream. */
354 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
355 06e5fc98 2018-02-11 stsp while (err == NULL && remain > 0) {
356 824801e7 2018-01-27 stsp if (*p & GOT_DELTA_BASE_COPY) {
357 885d3e02 2018-01-27 stsp off_t offset = 0;
358 885d3e02 2018-01-27 stsp size_t len = 0;
359 885d3e02 2018-01-27 stsp err = parse_opcode(&offset, &len, &p, &remain);
362 39ff877f 2018-03-13 stsp err = copy_from_base(base_file, offset, len,
363 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
364 06e5fc98 2018-02-11 stsp if (err == NULL) {
365 b29656e2 2018-03-16 stsp *outsize += len;
366 06e5fc98 2018-02-11 stsp if (remain > 0) {
372 885d3e02 2018-01-27 stsp size_t len = (size_t)*p;
373 885d3e02 2018-01-27 stsp if (len == 0) {
374 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
377 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
380 39ff877f 2018-03-13 stsp err = copy_from_delta(&p, &remain, len,
381 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
382 885d3e02 2018-01-27 stsp if (err == NULL)
383 b29656e2 2018-03-16 stsp *outsize += len;
387 b29656e2 2018-03-16 stsp if (*outsize != result_size)
388 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
390 39ff877f 2018-03-13 stsp if (memstream != NULL) {
391 39ff877f 2018-03-13 stsp fclose(memstream);
392 39ff877f 2018-03-13 stsp if (err == NULL) {
394 39ff877f 2018-03-13 stsp n = fwrite(memstream_buf, 1, memstream_size, outfile);
395 39ff877f 2018-03-13 stsp if (n != memstream_size)
396 39ff877f 2018-03-13 stsp err = got_ferror(outfile, GOT_ERR_IO);
398 39ff877f 2018-03-13 stsp free(memstream_buf);
400 885d3e02 2018-01-27 stsp if (err == NULL)
401 885d3e02 2018-01-27 stsp rewind(outfile);
402 885d3e02 2018-01-27 stsp return err;