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 efd2a263 2018-01-19 stsp #include <zlib.h>
24 efd2a263 2018-01-19 stsp #include <sha1.h>
25 788c352e 2018-06-16 stsp #include <time.h>
26 15a94983 2018-12-23 stsp #include <zlib.h>
28 efd2a263 2018-01-19 stsp #include "got_error.h"
29 efd2a263 2018-01-19 stsp #include "got_repository.h"
30 efd2a263 2018-01-19 stsp #include "got_object.h"
32 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
33 718b3ab0 2018-03-17 stsp #include "got_lib_path.h"
34 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
35 15a94983 2018-12-23 stsp #include "got_lib_object.h"
38 885d3e02 2018-01-27 stsp #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
41 c3703302 2018-01-23 stsp struct got_delta *
42 c336f889 2018-07-23 stsp got_delta_open(off_t offset, size_t tslen, int type, size_t size,
43 c336f889 2018-07-23 stsp off_t data_offset, uint8_t *delta_buf, size_t delta_len)
45 c3703302 2018-01-23 stsp struct got_delta *delta;
47 14118581 2018-11-05 stsp delta = malloc(sizeof(*delta));
48 c3703302 2018-01-23 stsp if (delta == NULL)
49 96f5e8b3 2018-01-23 stsp return NULL;
51 c3703302 2018-01-23 stsp delta->type = type;
52 c3703302 2018-01-23 stsp delta->offset = offset;
53 0e22967e 2018-02-11 stsp delta->tslen = tslen;
54 c3703302 2018-01-23 stsp delta->size = size;
55 bdd2fbb3 2018-02-11 stsp delta->data_offset = data_offset;
56 a53d2f13 2018-03-17 stsp delta->delta_buf = delta_buf;
57 a53d2f13 2018-03-17 stsp delta->delta_len = delta_len;
58 c3703302 2018-01-23 stsp return delta;
62 c3703302 2018-01-23 stsp got_delta_close(struct got_delta *delta)
64 a53d2f13 2018-03-17 stsp free(delta->delta_buf);
65 c3703302 2018-01-23 stsp free(delta);
68 efd2a263 2018-01-19 stsp const struct got_error *
69 96f5e8b3 2018-01-23 stsp got_delta_chain_get_base_type(int *type, struct got_delta_chain *deltas)
71 c3703302 2018-01-23 stsp struct got_delta *delta;
73 6691714a 2018-01-23 stsp /* The first delta in the chain should represent the base object. */
74 6691714a 2018-01-23 stsp delta = SIMPLEQ_FIRST(&deltas->entries);
75 6691714a 2018-01-23 stsp if (delta->type == GOT_OBJ_TYPE_COMMIT ||
76 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TREE ||
77 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_BLOB ||
78 6691714a 2018-01-23 stsp delta->type == GOT_OBJ_TYPE_TAG) {
79 6691714a 2018-01-23 stsp *type = delta->type;
80 6691714a 2018-01-23 stsp return NULL;
83 96f5e8b3 2018-01-23 stsp return got_error(GOT_ERR_BAD_DELTA_CHAIN);
86 885d3e02 2018-01-27 stsp /* Fetch another (required) byte from the delta stream. */
87 885d3e02 2018-01-27 stsp static const struct got_error *
88 885d3e02 2018-01-27 stsp next_delta_byte(const uint8_t **p, size_t *remain)
90 885d3e02 2018-01-27 stsp if (--(*remain) == 0)
91 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
93 885d3e02 2018-01-27 stsp return NULL;
96 885d3e02 2018-01-27 stsp static const struct got_error *
97 885d3e02 2018-01-27 stsp parse_size(uint64_t *size, const uint8_t **p, size_t *remain)
99 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
104 885d3e02 2018-01-27 stsp /* We do not support size values which don't fit in 64 bit. */
106 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_NO_SPACE);
108 885d3e02 2018-01-27 stsp if (i == 0)
109 885d3e02 2018-01-27 stsp *size = ((**p) & GOT_DELTA_SIZE_VAL_MASK);
111 885d3e02 2018-01-27 stsp size_t shift = GOT_DELTA_SIZE_SHIFT * i;
112 885d3e02 2018-01-27 stsp *size |= (((**p) & GOT_DELTA_SIZE_VAL_MASK) << shift);
115 885d3e02 2018-01-27 stsp if (((**p) & GOT_DELTA_SIZE_MORE) == 0)
118 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
119 885d3e02 2018-01-27 stsp } while (err == NULL);
121 885d3e02 2018-01-27 stsp return err;
124 885d3e02 2018-01-27 stsp static const struct got_error *
125 885d3e02 2018-01-27 stsp parse_opcode(off_t *offset, size_t *len, const uint8_t **p, size_t *remain)
127 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
128 885d3e02 2018-01-27 stsp off_t o = 0;
129 885d3e02 2018-01-27 stsp size_t l = 0;
130 885d3e02 2018-01-27 stsp uint8_t opcode = **p;
132 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF1) {
133 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
135 885d3e02 2018-01-27 stsp return err;
136 885d3e02 2018-01-27 stsp o = (off_t)(**p);
138 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF2) {
139 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
141 885d3e02 2018-01-27 stsp return err;
142 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 8;
144 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF3) {
145 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
147 885d3e02 2018-01-27 stsp return err;
148 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 16;
150 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_OFF4) {
151 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
153 885d3e02 2018-01-27 stsp return err;
154 885d3e02 2018-01-27 stsp o |= ((off_t)(**p)) << 24;
157 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN1) {
158 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
160 885d3e02 2018-01-27 stsp return err;
161 885d3e02 2018-01-27 stsp l = (off_t)(**p);
163 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN2) {
164 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
166 885d3e02 2018-01-27 stsp return err;
167 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 8;
169 885d3e02 2018-01-27 stsp if (opcode & GOT_DELTA_COPY_LEN3) {
170 885d3e02 2018-01-27 stsp err = next_delta_byte(p, remain);
172 885d3e02 2018-01-27 stsp return err;
173 885d3e02 2018-01-27 stsp l |= ((off_t)(**p)) << 16;
176 885d3e02 2018-01-27 stsp if (o == 0)
177 885d3e02 2018-01-27 stsp o = GOT_DELTA_COPY_DEFAULT_OFF;
178 885d3e02 2018-01-27 stsp if (l == 0)
179 885d3e02 2018-01-27 stsp l = GOT_DELTA_COPY_DEFAULT_LEN;
181 885d3e02 2018-01-27 stsp *offset = o;
183 885d3e02 2018-01-27 stsp return NULL;
186 885d3e02 2018-01-27 stsp static const struct got_error *
187 885d3e02 2018-01-27 stsp copy_from_base(FILE *base_file, off_t offset, size_t size, FILE *outfile)
189 885d3e02 2018-01-27 stsp if (fseeko(base_file, offset, SEEK_SET) != 0)
190 885d3e02 2018-01-27 stsp return got_error_from_errno();
192 885d3e02 2018-01-27 stsp while (size > 0) {
193 885d3e02 2018-01-27 stsp uint8_t data[2048];
194 885d3e02 2018-01-27 stsp size_t len = MIN(size, sizeof(data));
197 885d3e02 2018-01-27 stsp n = fread(data, len, 1, base_file);
198 885d3e02 2018-01-27 stsp if (n != 1)
199 885d3e02 2018-01-27 stsp return got_ferror(base_file, GOT_ERR_IO);
201 885d3e02 2018-01-27 stsp n = fwrite(data, len, 1, outfile);
202 885d3e02 2018-01-27 stsp if (n != 1)
203 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
205 885d3e02 2018-01-27 stsp size -= len;
208 885d3e02 2018-01-27 stsp return NULL;
211 885d3e02 2018-01-27 stsp static const struct got_error *
212 885d3e02 2018-01-27 stsp copy_from_delta(const uint8_t **p, size_t *remain, size_t len, FILE *outfile)
216 885d3e02 2018-01-27 stsp if (*remain < len)
217 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
219 885d3e02 2018-01-27 stsp n = fwrite(*p, len, 1, outfile);
220 885d3e02 2018-01-27 stsp if (n != 1)
221 885d3e02 2018-01-27 stsp return got_ferror(outfile, GOT_ERR_IO);
224 885d3e02 2018-01-27 stsp *remain -= len;
225 885d3e02 2018-01-27 stsp return NULL;
228 22484865 2018-03-13 stsp static const struct got_error *
229 22484865 2018-03-13 stsp parse_delta_sizes(uint64_t *base_size, uint64_t *result_size,
230 22484865 2018-03-13 stsp const uint8_t **p, size_t *remain)
232 22484865 2018-03-13 stsp const struct got_error *err;
234 22484865 2018-03-13 stsp /* Read the two size fields at the beginning of the stream. */
235 22484865 2018-03-13 stsp err = parse_size(base_size, p, remain);
237 22484865 2018-03-13 stsp return err;
238 22484865 2018-03-13 stsp err = next_delta_byte(p, remain);
240 22484865 2018-03-13 stsp return err;
241 22484865 2018-03-13 stsp err = parse_size(result_size, p, remain);
243 22484865 2018-03-13 stsp return err;
245 22484865 2018-03-13 stsp return NULL;
248 885d3e02 2018-01-27 stsp const struct got_error *
249 22484865 2018-03-13 stsp got_delta_get_sizes(uint64_t *base_size, uint64_t *result_size,
250 22484865 2018-03-13 stsp const uint8_t *delta_buf, size_t delta_len)
252 22484865 2018-03-13 stsp size_t remain;
253 22484865 2018-03-13 stsp const uint8_t *p;
255 22484865 2018-03-13 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
256 22484865 2018-03-13 stsp return got_error(GOT_ERR_BAD_DELTA);
258 22484865 2018-03-13 stsp p = delta_buf;
259 22484865 2018-03-13 stsp remain = delta_len;
260 22484865 2018-03-13 stsp return parse_delta_sizes(base_size, result_size, &p, &remain);
263 8628c62d 2018-03-15 stsp const struct got_error *
264 34fca9c3 2018-11-11 stsp got_delta_apply_in_mem(uint8_t *base_buf, size_t base_bufsz,
265 34fca9c3 2018-11-11 stsp const uint8_t *delta_buf, size_t delta_len, uint8_t *outbuf,
266 34fca9c3 2018-11-11 stsp size_t *outsize, size_t maxoutsize)
268 8628c62d 2018-03-15 stsp const struct got_error *err = NULL;
269 8628c62d 2018-03-15 stsp uint64_t base_size, result_size;
270 8628c62d 2018-03-15 stsp size_t remain;
271 8628c62d 2018-03-15 stsp const uint8_t *p;
273 8628c62d 2018-03-15 stsp *outsize= 0;
275 8628c62d 2018-03-15 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
276 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
278 8628c62d 2018-03-15 stsp p = delta_buf;
279 8628c62d 2018-03-15 stsp remain = delta_len;
280 8628c62d 2018-03-15 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
282 8628c62d 2018-03-15 stsp return err;
284 8628c62d 2018-03-15 stsp /* Decode and execute copy instructions from the delta stream. */
285 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
286 8628c62d 2018-03-15 stsp while (err == NULL && remain > 0) {
287 8628c62d 2018-03-15 stsp if (*p & GOT_DELTA_BASE_COPY) {
288 8628c62d 2018-03-15 stsp off_t offset = 0;
289 8628c62d 2018-03-15 stsp size_t len = 0;
290 8628c62d 2018-03-15 stsp err = parse_opcode(&offset, &len, &p, &remain);
293 b2f7af54 2018-11-11 stsp if (SIZE_MAX - offset < len || offset + len < 0 ||
294 b2f7af54 2018-11-11 stsp base_bufsz < offset + len ||
295 34fca9c3 2018-11-11 stsp *outsize + len > maxoutsize)
296 34fca9c3 2018-11-11 stsp return got_error(GOT_ERR_BAD_DELTA);
297 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, base_buf + offset, len);
298 8628c62d 2018-03-15 stsp if (err == NULL) {
299 8628c62d 2018-03-15 stsp *outsize += len;
300 8628c62d 2018-03-15 stsp if (remain > 0) {
306 8628c62d 2018-03-15 stsp size_t len = (size_t)*p;
307 8628c62d 2018-03-15 stsp if (len == 0) {
308 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
311 8628c62d 2018-03-15 stsp err = next_delta_byte(&p, &remain);
314 b2f7af54 2018-11-11 stsp if (remain < len || SIZE_MAX - *outsize < len ||
315 b2f7af54 2018-11-11 stsp *outsize + len > maxoutsize)
316 8628c62d 2018-03-15 stsp return got_error(GOT_ERR_BAD_DELTA);
317 8628c62d 2018-03-15 stsp memcpy(outbuf + *outsize, p, len);
319 8628c62d 2018-03-15 stsp remain -= len;
320 8628c62d 2018-03-15 stsp *outsize += len;
324 8628c62d 2018-03-15 stsp if (*outsize != result_size)
325 8628c62d 2018-03-15 stsp err = got_error(GOT_ERR_BAD_DELTA);
326 8628c62d 2018-03-15 stsp return err;
329 22484865 2018-03-13 stsp const struct got_error *
330 0e22967e 2018-02-11 stsp got_delta_apply(FILE *base_file, const uint8_t *delta_buf,
331 b29656e2 2018-03-16 stsp size_t delta_len, FILE *outfile, size_t *outsize)
333 885d3e02 2018-01-27 stsp const struct got_error *err = NULL;
334 885d3e02 2018-01-27 stsp uint64_t base_size, result_size;
335 b29656e2 2018-03-16 stsp size_t remain = 0;
336 885d3e02 2018-01-27 stsp const uint8_t *p;
337 39ff877f 2018-03-13 stsp FILE *memstream = NULL;
338 39ff877f 2018-03-13 stsp char *memstream_buf = NULL;
339 39ff877f 2018-03-13 stsp size_t memstream_size = 0;
341 b29656e2 2018-03-16 stsp *outsize = 0;
343 885d3e02 2018-01-27 stsp if (delta_len < GOT_DELTA_STREAM_LENGTH_MIN)
344 885d3e02 2018-01-27 stsp return got_error(GOT_ERR_BAD_DELTA);
346 885d3e02 2018-01-27 stsp p = delta_buf;
347 885d3e02 2018-01-27 stsp remain = delta_len;
348 22484865 2018-03-13 stsp err = parse_delta_sizes(&base_size, &result_size, &p, &remain);
350 885d3e02 2018-01-27 stsp return err;
352 39ff877f 2018-03-13 stsp if (result_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX)
353 39ff877f 2018-03-13 stsp memstream = open_memstream(&memstream_buf, &memstream_size);
355 885d3e02 2018-01-27 stsp /* Decode and execute copy instructions from the delta stream. */
356 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
357 06e5fc98 2018-02-11 stsp while (err == NULL && remain > 0) {
358 824801e7 2018-01-27 stsp if (*p & GOT_DELTA_BASE_COPY) {
359 885d3e02 2018-01-27 stsp off_t offset = 0;
360 885d3e02 2018-01-27 stsp size_t len = 0;
361 885d3e02 2018-01-27 stsp err = parse_opcode(&offset, &len, &p, &remain);
364 39ff877f 2018-03-13 stsp err = copy_from_base(base_file, offset, len,
365 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
366 06e5fc98 2018-02-11 stsp if (err == NULL) {
367 b29656e2 2018-03-16 stsp *outsize += len;
368 06e5fc98 2018-02-11 stsp if (remain > 0) {
374 885d3e02 2018-01-27 stsp size_t len = (size_t)*p;
375 885d3e02 2018-01-27 stsp if (len == 0) {
376 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
379 885d3e02 2018-01-27 stsp err = next_delta_byte(&p, &remain);
382 39ff877f 2018-03-13 stsp err = copy_from_delta(&p, &remain, len,
383 39ff877f 2018-03-13 stsp memstream ? memstream : outfile);
384 885d3e02 2018-01-27 stsp if (err == NULL)
385 b29656e2 2018-03-16 stsp *outsize += len;
389 b29656e2 2018-03-16 stsp if (*outsize != result_size)
390 885d3e02 2018-01-27 stsp err = got_error(GOT_ERR_BAD_DELTA);
392 39ff877f 2018-03-13 stsp if (memstream != NULL) {
393 39ff877f 2018-03-13 stsp fclose(memstream);
394 39ff877f 2018-03-13 stsp if (err == NULL) {
396 39ff877f 2018-03-13 stsp n = fwrite(memstream_buf, 1, memstream_size, outfile);
397 39ff877f 2018-03-13 stsp if (n != memstream_size)
398 39ff877f 2018-03-13 stsp err = got_ferror(outfile, GOT_ERR_IO);
400 39ff877f 2018-03-13 stsp free(memstream_buf);
402 885d3e02 2018-01-27 stsp if (err == NULL)
403 885d3e02 2018-01-27 stsp rewind(outfile);
404 885d3e02 2018-01-27 stsp return err;