1 0a0a3048 2018-01-10 stsp /*
  2 0a0a3048 2018-01-10 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
  3 0a0a3048 2018-01-10 stsp  *
  4 0a0a3048 2018-01-10 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 0a0a3048 2018-01-10 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 0a0a3048 2018-01-10 stsp  * copyright notice and this permission notice appear in all copies.
  7 0a0a3048 2018-01-10 stsp  *
  8 0a0a3048 2018-01-10 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 0a0a3048 2018-01-10 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 0a0a3048 2018-01-10 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 0a0a3048 2018-01-10 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 0a0a3048 2018-01-10 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 0a0a3048 2018-01-10 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 0a0a3048 2018-01-10 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 0a0a3048 2018-01-10 stsp  */
 16 0a0a3048 2018-01-10 stsp 
 17 a1fd68d8 2018-01-12 stsp #include <sys/types.h>
 18 0a0a3048 2018-01-10 stsp #include <sys/stat.h>
 19 a1fd68d8 2018-01-12 stsp #include <sys/queue.h>
 20 0a0a3048 2018-01-10 stsp 
 21 a1fd68d8 2018-01-12 stsp #include <dirent.h>
 22 a1fd68d8 2018-01-12 stsp #include <errno.h>
 23 0a0a3048 2018-01-10 stsp #include <stdio.h>
 24 a1fd68d8 2018-01-12 stsp #include <stdint.h>
 25 0a0a3048 2018-01-10 stsp #include <stdlib.h>
 26 0a0a3048 2018-01-10 stsp #include <string.h>
 27 0a0a3048 2018-01-10 stsp #include <limits.h>
 28 0a0a3048 2018-01-10 stsp #include <sha1.h>
 29 0a0a3048 2018-01-10 stsp #include <endian.h>
 30 a1fd68d8 2018-01-12 stsp #include <zlib.h>
 31 0a0a3048 2018-01-10 stsp 
 32 0a0a3048 2018-01-10 stsp #include "got_error.h"
 33 a1fd68d8 2018-01-12 stsp #include "got_object.h"
 34 a1fd68d8 2018-01-12 stsp #include "got_repository.h"
 35 a1fd68d8 2018-01-12 stsp #include "got_sha1.h"
 36 0a0a3048 2018-01-10 stsp #include "pack.h"
 37 a1fd68d8 2018-01-12 stsp #include "path.h"
 38 efd2a263 2018-01-19 stsp #include "delta.h"
 39 eef6493a 2018-01-19 stsp #include "object.h"
 40 0a0a3048 2018-01-10 stsp 
 41 a1fd68d8 2018-01-12 stsp #define GOT_PACK_PREFIX		"pack-"
 42 a1fd68d8 2018-01-12 stsp #define GOT_PACKFILE_SUFFIX	".pack"
 43 a1fd68d8 2018-01-12 stsp #define GOT_PACKIDX_SUFFIX		".idx"
 44 a1fd68d8 2018-01-12 stsp #define GOT_PACKFILE_NAMELEN	(strlen(GOT_PACK_PREFIX) + \
 45 a1fd68d8 2018-01-12 stsp 				SHA1_DIGEST_STRING_LENGTH - 1 + \
 46 a1fd68d8 2018-01-12 stsp 				strlen(GOT_PACKFILE_SUFFIX))
 47 a1fd68d8 2018-01-12 stsp #define GOT_PACKIDX_NAMELEN	(strlen(GOT_PACK_PREFIX) + \
 48 a1fd68d8 2018-01-12 stsp 				SHA1_DIGEST_STRING_LENGTH - 1 + \
 49 a1fd68d8 2018-01-12 stsp 				strlen(GOT_PACKIDX_SUFFIX))
 50 a1fd68d8 2018-01-12 stsp 
 51 a1fd68d8 2018-01-12 stsp #ifndef MIN
 52 a1fd68d8 2018-01-12 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
 53 a1fd68d8 2018-01-12 stsp #endif
 54 a1fd68d8 2018-01-12 stsp 
 55 0a0a3048 2018-01-10 stsp static const struct got_error *
 56 0a0a3048 2018-01-10 stsp verify_fanout_table(uint32_t *fanout_table)
 57 0a0a3048 2018-01-10 stsp {
 58 0a0a3048 2018-01-10 stsp 	int i;
 59 0a0a3048 2018-01-10 stsp 
 60 0a0a3048 2018-01-10 stsp 	for (i = 0; i < 0xff - 1; i++) {
 61 a1fd68d8 2018-01-12 stsp 		if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
 62 0a0a3048 2018-01-10 stsp 			return got_error(GOT_ERR_BAD_PACKIDX);
 63 0a0a3048 2018-01-10 stsp 	}
 64 0a0a3048 2018-01-10 stsp 
 65 0a0a3048 2018-01-10 stsp 	return NULL;
 66 0a0a3048 2018-01-10 stsp }
 67 0a0a3048 2018-01-10 stsp 
 68 24541888 2018-01-10 stsp static const struct got_error *
 69 0a0a3048 2018-01-10 stsp get_packfile_size(size_t *size, const char *path_idx)
 70 0a0a3048 2018-01-10 stsp {
 71 0a0a3048 2018-01-10 stsp 	struct stat sb;
 72 0a0a3048 2018-01-10 stsp 	char *path_pack;
 73 0a0a3048 2018-01-10 stsp 	char base_path[PATH_MAX];
 74 0a0a3048 2018-01-10 stsp 	char *dot;
 75 0a0a3048 2018-01-10 stsp 
 76 0a0a3048 2018-01-10 stsp 	if (strlcpy(base_path, path_idx, PATH_MAX) > PATH_MAX)
 77 0a0a3048 2018-01-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 78 0a0a3048 2018-01-10 stsp 
 79 0a0a3048 2018-01-10 stsp 	dot = strrchr(base_path, '.');
 80 0a0a3048 2018-01-10 stsp 	if (dot == NULL)
 81 0a0a3048 2018-01-10 stsp 		return got_error(GOT_ERR_BAD_PATH);
 82 0a0a3048 2018-01-10 stsp 	*dot = '\0';
 83 0a0a3048 2018-01-10 stsp 	if (asprintf(&path_pack, "%s.pack", base_path) == -1)
 84 0a0a3048 2018-01-10 stsp 		return got_error(GOT_ERR_NO_MEM);
 85 0a0a3048 2018-01-10 stsp 
 86 0a0a3048 2018-01-10 stsp 	if (stat(path_pack, &sb) != 0) {
 87 0a0a3048 2018-01-10 stsp 		free(path_pack);
 88 8251fdbc 2018-01-12 stsp 		return got_error_from_errno();
 89 0a0a3048 2018-01-10 stsp 	}
 90 0a0a3048 2018-01-10 stsp 
 91 0a0a3048 2018-01-10 stsp 	free(path_pack);
 92 0a0a3048 2018-01-10 stsp 	*size = sb.st_size;
 93 0a0a3048 2018-01-10 stsp 	return 0;
 94 0a0a3048 2018-01-10 stsp }
 95 0a0a3048 2018-01-10 stsp 
 96 0a0a3048 2018-01-10 stsp const struct got_error *
 97 0a0a3048 2018-01-10 stsp got_packidx_open(struct got_packidx_v2_hdr **packidx, const char *path)
 98 0a0a3048 2018-01-10 stsp {
 99 0a0a3048 2018-01-10 stsp 	struct got_packidx_v2_hdr *p;
100 0a0a3048 2018-01-10 stsp 	FILE *f;
101 0a0a3048 2018-01-10 stsp 	const struct got_error *err = NULL;
102 0a0a3048 2018-01-10 stsp 	size_t n, nobj, packfile_size;
103 0ebaf008 2018-01-10 stsp 	SHA1_CTX ctx;
104 0ebaf008 2018-01-10 stsp 	uint8_t sha1[SHA1_DIGEST_LENGTH];
105 0a0a3048 2018-01-10 stsp 
106 0ebaf008 2018-01-10 stsp 	SHA1Init(&ctx);
107 0ebaf008 2018-01-10 stsp 
108 0a0a3048 2018-01-10 stsp 	f = fopen(path, "rb");
109 0a0a3048 2018-01-10 stsp 	if (f == NULL)
110 0a0a3048 2018-01-10 stsp 		return got_error(GOT_ERR_BAD_PATH);
111 0a0a3048 2018-01-10 stsp 
112 0a0a3048 2018-01-10 stsp 	err = get_packfile_size(&packfile_size, path);
113 0a0a3048 2018-01-10 stsp 	if (err)
114 0a0a3048 2018-01-10 stsp 		return err;
115 0a0a3048 2018-01-10 stsp 
116 0a0a3048 2018-01-10 stsp 	p = calloc(1, sizeof(*p));
117 0a0a3048 2018-01-10 stsp 	if (p == NULL) {
118 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_NO_MEM);
119 0a0a3048 2018-01-10 stsp 		goto done;
120 0a0a3048 2018-01-10 stsp 	}
121 0a0a3048 2018-01-10 stsp 
122 0a0a3048 2018-01-10 stsp 	n = fread(&p->magic, sizeof(p->magic), 1, f);
123 0a0a3048 2018-01-10 stsp 	if (n != 1) {
124 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
125 0a0a3048 2018-01-10 stsp 		goto done;
126 0a0a3048 2018-01-10 stsp 	}
127 0a0a3048 2018-01-10 stsp 
128 0a0a3048 2018-01-10 stsp 	if (betoh32(p->magic) != GOT_PACKIDX_V2_MAGIC) {
129 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
130 0a0a3048 2018-01-10 stsp 		goto done;
131 0a0a3048 2018-01-10 stsp 	}
132 0a0a3048 2018-01-10 stsp 
133 0ebaf008 2018-01-10 stsp 	SHA1Update(&ctx, (uint8_t *)&p->magic, sizeof(p->magic));
134 0ebaf008 2018-01-10 stsp 
135 0a0a3048 2018-01-10 stsp 	n = fread(&p->version, sizeof(p->version), 1, f);
136 0a0a3048 2018-01-10 stsp 	if (n != 1) {
137 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
138 0a0a3048 2018-01-10 stsp 		goto done;
139 0a0a3048 2018-01-10 stsp 	}
140 0a0a3048 2018-01-10 stsp 
141 0a0a3048 2018-01-10 stsp 	if (betoh32(p->version) != GOT_PACKIDX_VERSION) {
142 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
143 0a0a3048 2018-01-10 stsp 		goto done;
144 0a0a3048 2018-01-10 stsp 	}
145 0a0a3048 2018-01-10 stsp 
146 0ebaf008 2018-01-10 stsp 	SHA1Update(&ctx, (uint8_t *)&p->version, sizeof(p->version));
147 0ebaf008 2018-01-10 stsp 
148 0a0a3048 2018-01-10 stsp 	n = fread(&p->fanout_table, sizeof(p->fanout_table), 1, f);
149 0a0a3048 2018-01-10 stsp 	if (n != 1) {
150 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
151 0a0a3048 2018-01-10 stsp 		goto done;
152 0a0a3048 2018-01-10 stsp 	}
153 0a0a3048 2018-01-10 stsp 
154 0a0a3048 2018-01-10 stsp 	err = verify_fanout_table(p->fanout_table);
155 0a0a3048 2018-01-10 stsp 	if (err)
156 0a0a3048 2018-01-10 stsp 		goto done;
157 0a0a3048 2018-01-10 stsp 
158 0ebaf008 2018-01-10 stsp 	SHA1Update(&ctx, (uint8_t *)p->fanout_table, sizeof(p->fanout_table));
159 0ebaf008 2018-01-10 stsp 
160 0a0a3048 2018-01-10 stsp 	nobj = betoh32(p->fanout_table[0xff]);
161 0a0a3048 2018-01-10 stsp 
162 0a0a3048 2018-01-10 stsp 	p->sorted_ids = calloc(nobj, sizeof(*p->sorted_ids));
163 0a0a3048 2018-01-10 stsp 	if (p->sorted_ids == NULL) {
164 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_NO_MEM);
165 0a0a3048 2018-01-10 stsp 		goto done;
166 0a0a3048 2018-01-10 stsp 	}
167 0a0a3048 2018-01-10 stsp 
168 0a0a3048 2018-01-10 stsp 	n = fread(p->sorted_ids, sizeof(*p->sorted_ids), nobj, f);
169 0a0a3048 2018-01-10 stsp 	if (n != nobj) {
170 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
171 0a0a3048 2018-01-10 stsp 		goto done;
172 0a0a3048 2018-01-10 stsp 	}
173 0a0a3048 2018-01-10 stsp 
174 0ebaf008 2018-01-10 stsp 	SHA1Update(&ctx, (uint8_t *)p->sorted_ids,
175 0ebaf008 2018-01-10 stsp 	    nobj * sizeof(*p->sorted_ids));
176 0ebaf008 2018-01-10 stsp 
177 a1fd68d8 2018-01-12 stsp 	p->crc32 = calloc(nobj, sizeof(*p->crc32));
178 a1fd68d8 2018-01-12 stsp 	if (p->crc32 == NULL) {
179 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_NO_MEM);
180 0a0a3048 2018-01-10 stsp 		goto done;
181 0a0a3048 2018-01-10 stsp 	}
182 0a0a3048 2018-01-10 stsp 
183 a1fd68d8 2018-01-12 stsp 	n = fread(p->crc32, sizeof(*p->crc32), nobj, f);
184 0a0a3048 2018-01-10 stsp 	if (n != nobj) {
185 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
186 0a0a3048 2018-01-10 stsp 		goto done;
187 0a0a3048 2018-01-10 stsp 	}
188 0a0a3048 2018-01-10 stsp 
189 a1fd68d8 2018-01-12 stsp 	SHA1Update(&ctx, (uint8_t *)p->crc32, nobj * sizeof(*p->crc32));
190 0ebaf008 2018-01-10 stsp 
191 a1fd68d8 2018-01-12 stsp 	p->offsets = calloc(nobj, sizeof(*p->offsets));
192 a1fd68d8 2018-01-12 stsp 	if (p->offsets == NULL) {
193 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_NO_MEM);
194 0a0a3048 2018-01-10 stsp 		goto done;
195 0a0a3048 2018-01-10 stsp 	}
196 0a0a3048 2018-01-10 stsp 
197 a1fd68d8 2018-01-12 stsp 	n = fread(p->offsets, sizeof(*p->offsets), nobj, f);
198 0a0a3048 2018-01-10 stsp 	if (n != nobj) {
199 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
200 0a0a3048 2018-01-10 stsp 		goto done;
201 0a0a3048 2018-01-10 stsp 	}
202 0a0a3048 2018-01-10 stsp 
203 a1fd68d8 2018-01-12 stsp 	SHA1Update(&ctx, (uint8_t *)p->offsets, nobj * sizeof(*p->offsets));
204 0ebaf008 2018-01-10 stsp 
205 0a0a3048 2018-01-10 stsp 	/* Large file offsets are contained only in files > 2GB. */
206 b0517dd0 2018-01-10 stsp 	if (packfile_size <= 0x80000000)
207 0a0a3048 2018-01-10 stsp 		goto checksum;
208 0a0a3048 2018-01-10 stsp 
209 0a0a3048 2018-01-10 stsp 	p->large_offsets = calloc(nobj, sizeof(*p->large_offsets));
210 0a0a3048 2018-01-10 stsp 	if (p->large_offsets == NULL) {
211 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_NO_MEM);
212 0a0a3048 2018-01-10 stsp 		goto done;
213 0a0a3048 2018-01-10 stsp 	}
214 0a0a3048 2018-01-10 stsp 
215 0a0a3048 2018-01-10 stsp 	n = fread(p->large_offsets, sizeof(*p->large_offsets), nobj, f);
216 0a0a3048 2018-01-10 stsp 	if (n != nobj) {
217 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
218 0a0a3048 2018-01-10 stsp 		goto done;
219 0a0a3048 2018-01-10 stsp 	}
220 0a0a3048 2018-01-10 stsp 
221 0ebaf008 2018-01-10 stsp 	SHA1Update(&ctx, (uint8_t*)p->large_offsets,
222 0ebaf008 2018-01-10 stsp 	    nobj * sizeof(*p->large_offsets));
223 0ebaf008 2018-01-10 stsp 
224 0a0a3048 2018-01-10 stsp checksum:
225 0a0a3048 2018-01-10 stsp 	n = fread(&p->trailer, sizeof(p->trailer), 1, f);
226 0a0a3048 2018-01-10 stsp 	if (n != 1) {
227 8251fdbc 2018-01-12 stsp 		err = got_ferror(f, GOT_ERR_BAD_PACKIDX);
228 0a0a3048 2018-01-10 stsp 		goto done;
229 0a0a3048 2018-01-10 stsp 	}
230 0a0a3048 2018-01-10 stsp 
231 a1fd68d8 2018-01-12 stsp 	SHA1Update(&ctx, p->trailer.packfile_sha1, SHA1_DIGEST_LENGTH);
232 0ebaf008 2018-01-10 stsp 	SHA1Final(sha1, &ctx);
233 a1fd68d8 2018-01-12 stsp 	if (memcmp(p->trailer.packidx_sha1, sha1, SHA1_DIGEST_LENGTH) != 0)
234 0ebaf008 2018-01-10 stsp 		err = got_error(GOT_ERR_PACKIDX_CSUM);
235 0a0a3048 2018-01-10 stsp done:
236 0a0a3048 2018-01-10 stsp 	fclose(f);
237 0a0a3048 2018-01-10 stsp 	if (err)
238 0a0a3048 2018-01-10 stsp 		got_packidx_close(p);
239 0a0a3048 2018-01-10 stsp 	else
240 0a0a3048 2018-01-10 stsp 		*packidx = p;
241 0a0a3048 2018-01-10 stsp 	return err;
242 0a0a3048 2018-01-10 stsp }
243 0a0a3048 2018-01-10 stsp 
244 0a0a3048 2018-01-10 stsp void
245 0a0a3048 2018-01-10 stsp got_packidx_close(struct got_packidx_v2_hdr *packidx)
246 0a0a3048 2018-01-10 stsp {
247 0a0a3048 2018-01-10 stsp 	free(packidx->sorted_ids);
248 0a0a3048 2018-01-10 stsp 	free(packidx->offsets);
249 0a0a3048 2018-01-10 stsp 	free(packidx->crc32);
250 0a0a3048 2018-01-10 stsp 	free(packidx->large_offsets);
251 0a0a3048 2018-01-10 stsp 	free(packidx);
252 a1fd68d8 2018-01-12 stsp }
253 a1fd68d8 2018-01-12 stsp 
254 a1fd68d8 2018-01-12 stsp static int
255 a1fd68d8 2018-01-12 stsp is_packidx_filename(const char *name, size_t len)
256 a1fd68d8 2018-01-12 stsp {
257 a1fd68d8 2018-01-12 stsp 	if (len != GOT_PACKIDX_NAMELEN)
258 a1fd68d8 2018-01-12 stsp 		return 0;
259 a1fd68d8 2018-01-12 stsp 
260 a1fd68d8 2018-01-12 stsp 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
261 a1fd68d8 2018-01-12 stsp 		return 0;
262 a1fd68d8 2018-01-12 stsp 
263 a1fd68d8 2018-01-12 stsp 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
264 a1fd68d8 2018-01-12 stsp 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
265 a1fd68d8 2018-01-12 stsp 		return 0;
266 a1fd68d8 2018-01-12 stsp 
267 a1fd68d8 2018-01-12 stsp 	return 1;
268 a1fd68d8 2018-01-12 stsp }
269 a1fd68d8 2018-01-12 stsp 
270 a1fd68d8 2018-01-12 stsp static off_t
271 a1fd68d8 2018-01-12 stsp get_object_offset(struct got_packidx_v2_hdr *packidx, int idx)
272 a1fd68d8 2018-01-12 stsp {
273 a1fd68d8 2018-01-12 stsp 	uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
274 a1fd68d8 2018-01-12 stsp 	uint32_t offset = betoh32(packidx->offsets[idx]);
275 a1fd68d8 2018-01-12 stsp 	if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
276 a1fd68d8 2018-01-12 stsp 		uint64_t loffset;
277 a1fd68d8 2018-01-12 stsp 		idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
278 a1fd68d8 2018-01-12 stsp 		if (idx < 0 || idx > totobj || packidx->large_offsets == NULL)
279 a1fd68d8 2018-01-12 stsp 			return -1;
280 a1fd68d8 2018-01-12 stsp 		loffset = betoh64(packidx->large_offsets[idx]);
281 a1fd68d8 2018-01-12 stsp 		return (loffset > INT64_MAX ? -1 : (off_t)loffset);
282 a1fd68d8 2018-01-12 stsp 	}
283 a1fd68d8 2018-01-12 stsp 	return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
284 a1fd68d8 2018-01-12 stsp }
285 a1fd68d8 2018-01-12 stsp 
286 a1fd68d8 2018-01-12 stsp static int
287 a1fd68d8 2018-01-12 stsp get_object_idx(struct got_packidx_v2_hdr *packidx, struct got_object_id *id)
288 a1fd68d8 2018-01-12 stsp {
289 a1fd68d8 2018-01-12 stsp 	u_int8_t id0 = id->sha1[0];
290 a1fd68d8 2018-01-12 stsp 	uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
291 a1fd68d8 2018-01-12 stsp 	int i = 0;
292 a1fd68d8 2018-01-12 stsp 
293 a1fd68d8 2018-01-12 stsp 	if (id0 > 0)
294 a1fd68d8 2018-01-12 stsp 		i = betoh32(packidx->fanout_table[id0 - 1]);
295 a1fd68d8 2018-01-12 stsp 
296 a1fd68d8 2018-01-12 stsp 	while (i < totobj) {
297 6c00b545 2018-01-17 stsp 		struct got_object_id *oid = &packidx->sorted_ids[i];
298 a1fd68d8 2018-01-12 stsp 		uint32_t offset;
299 2b2ca9f0 2018-01-13 stsp 		int cmp = got_object_id_cmp(id, oid);
300 a1fd68d8 2018-01-12 stsp 
301 6c00b545 2018-01-17 stsp 		if (cmp == 0)
302 6c00b545 2018-01-17 stsp 			return i;
303 6c00b545 2018-01-17 stsp 		else if (cmp > 0)
304 a1fd68d8 2018-01-12 stsp 			break;
305 6c00b545 2018-01-17 stsp 		i++;
306 a1fd68d8 2018-01-12 stsp 	}
307 a1fd68d8 2018-01-12 stsp 
308 a1fd68d8 2018-01-12 stsp 	return -1;
309 a1fd68d8 2018-01-12 stsp }
310 a1fd68d8 2018-01-12 stsp 
311 a1fd68d8 2018-01-12 stsp const struct got_error *
312 a1fd68d8 2018-01-12 stsp read_packfile_hdr(FILE *f, struct got_packidx_v2_hdr *packidx)
313 a1fd68d8 2018-01-12 stsp {
314 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
315 a1fd68d8 2018-01-12 stsp 	uint32_t totobj = betoh32(packidx->fanout_table[0xff]);
316 a1fd68d8 2018-01-12 stsp 	struct got_packfile_hdr hdr;
317 a1fd68d8 2018-01-12 stsp 	size_t n;
318 a1fd68d8 2018-01-12 stsp 
319 a1fd68d8 2018-01-12 stsp 	n = fread(&hdr, sizeof(hdr), 1, f);
320 a1fd68d8 2018-01-12 stsp 	if (n != 1)
321 8251fdbc 2018-01-12 stsp 		return got_ferror(f, GOT_ERR_BAD_PACKIDX);
322 a1fd68d8 2018-01-12 stsp 
323 a1fd68d8 2018-01-12 stsp 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
324 a1fd68d8 2018-01-12 stsp 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
325 a1fd68d8 2018-01-12 stsp 	    betoh32(hdr.nobjects) != totobj)
326 a1fd68d8 2018-01-12 stsp 		err = got_error(GOT_ERR_BAD_PACKFILE);
327 a1fd68d8 2018-01-12 stsp 
328 a1fd68d8 2018-01-12 stsp 	return err;
329 a487c1d0 2018-01-14 stsp }
330 a487c1d0 2018-01-14 stsp 
331 a487c1d0 2018-01-14 stsp static const struct got_error *
332 3ee5fc21 2018-01-17 stsp decode_type_and_size(uint8_t *type, uint64_t *size, size_t *len, FILE *packfile)
333 a487c1d0 2018-01-14 stsp {
334 a487c1d0 2018-01-14 stsp 	uint8_t t = 0;
335 a487c1d0 2018-01-14 stsp 	uint64_t s = 0;
336 a487c1d0 2018-01-14 stsp 	uint8_t sizeN;
337 a487c1d0 2018-01-14 stsp 	size_t n;
338 a487c1d0 2018-01-14 stsp 	int i = 0;
339 a487c1d0 2018-01-14 stsp 
340 a1fd68d8 2018-01-12 stsp 	do {
341 a1fd68d8 2018-01-12 stsp 		/* We do not support size values which don't fit in 64 bit. */
342 a487c1d0 2018-01-14 stsp 		if (i > 9)
343 a487c1d0 2018-01-14 stsp 			return got_error(GOT_ERR_NO_SPACE);
344 a1fd68d8 2018-01-12 stsp 
345 a1fd68d8 2018-01-12 stsp 		n = fread(&sizeN, sizeof(sizeN), 1, packfile);
346 a487c1d0 2018-01-14 stsp 		if (n != 1)
347 a487c1d0 2018-01-14 stsp 			return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
348 8251fdbc 2018-01-12 stsp 
349 a1fd68d8 2018-01-12 stsp 		if (i == 0) {
350 a487c1d0 2018-01-14 stsp 			t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
351 a1fd68d8 2018-01-12 stsp 			    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
352 a487c1d0 2018-01-14 stsp 			s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
353 a1fd68d8 2018-01-12 stsp 		} else {
354 a1fd68d8 2018-01-12 stsp 			size_t shift = 4 + 7 * (i - 1);
355 a487c1d0 2018-01-14 stsp 			s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
356 a1fd68d8 2018-01-12 stsp 		}
357 a1fd68d8 2018-01-12 stsp 		i++;
358 a1fd68d8 2018-01-12 stsp 	} while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
359 a1fd68d8 2018-01-12 stsp 
360 a487c1d0 2018-01-14 stsp 	*type = t;
361 a487c1d0 2018-01-14 stsp 	*size = s;
362 3ee5fc21 2018-01-17 stsp 	*len = i * sizeof(sizeN);
363 a487c1d0 2018-01-14 stsp 	return NULL;
364 0a0a3048 2018-01-10 stsp }
365 c54542a0 2018-01-13 stsp 
366 a1fd68d8 2018-01-12 stsp static const struct got_error *
367 9710aac2 2018-01-19 stsp open_plain_object(struct got_object **obj, const char *path_packfile,
368 6ccb713b 2018-01-19 stsp     struct got_object_id *id, uint8_t type, off_t offset, size_t size)
369 6ccb713b 2018-01-19 stsp {
370 6ccb713b 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
371 6ccb713b 2018-01-19 stsp 	if (*obj == NULL)
372 6ccb713b 2018-01-19 stsp 		return got_error(GOT_ERR_NO_MEM);
373 6ccb713b 2018-01-19 stsp 
374 6ccb713b 2018-01-19 stsp 	(*obj)->path_packfile = strdup(path_packfile);
375 6ccb713b 2018-01-19 stsp 	if ((*obj)->path_packfile == NULL) {
376 6ccb713b 2018-01-19 stsp 		free(*obj);
377 6ccb713b 2018-01-19 stsp 		*obj = NULL;
378 6ccb713b 2018-01-19 stsp 		return got_error(GOT_ERR_NO_MEM);
379 6ccb713b 2018-01-19 stsp 	}
380 6ccb713b 2018-01-19 stsp 
381 6ccb713b 2018-01-19 stsp 	(*obj)->type = type;
382 6ccb713b 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
383 6ccb713b 2018-01-19 stsp 	(*obj)->hdrlen = 0;
384 6ccb713b 2018-01-19 stsp 	(*obj)->size = size;
385 6ccb713b 2018-01-19 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
386 6ccb713b 2018-01-19 stsp 	(*obj)->pack_offset = offset;
387 b107e67f 2018-01-19 stsp 
388 b107e67f 2018-01-19 stsp 	return NULL;
389 b107e67f 2018-01-19 stsp }
390 b107e67f 2018-01-19 stsp 
391 b107e67f 2018-01-19 stsp static const struct got_error *
392 b107e67f 2018-01-19 stsp decode_negative_offset(int64_t *offset, size_t *len, FILE *packfile)
393 b107e67f 2018-01-19 stsp {
394 b107e67f 2018-01-19 stsp 	int64_t o = 0;
395 b107e67f 2018-01-19 stsp 	uint8_t offN;
396 b107e67f 2018-01-19 stsp 	size_t n;
397 b107e67f 2018-01-19 stsp 	int i = 0;
398 b107e67f 2018-01-19 stsp 
399 b107e67f 2018-01-19 stsp 	do {
400 b107e67f 2018-01-19 stsp 		/* We do not support offset values which don't fit in 64 bit. */
401 b107e67f 2018-01-19 stsp 		if (i > 8)
402 b107e67f 2018-01-19 stsp 			return got_error(GOT_ERR_NO_SPACE);
403 b107e67f 2018-01-19 stsp 
404 b107e67f 2018-01-19 stsp 		n = fread(&offN, sizeof(offN), 1, packfile);
405 b107e67f 2018-01-19 stsp 		if (n != 1)
406 b107e67f 2018-01-19 stsp 			return got_ferror(packfile, GOT_ERR_BAD_PACKIDX);
407 b107e67f 2018-01-19 stsp 
408 b107e67f 2018-01-19 stsp 		if (i == 0)
409 b107e67f 2018-01-19 stsp 			o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
410 b107e67f 2018-01-19 stsp 		else {
411 cecc778e 2018-01-23 stsp 			o++;
412 b107e67f 2018-01-19 stsp 			o <<= 7;
413 cecc778e 2018-01-23 stsp 			o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
414 b107e67f 2018-01-19 stsp 		}
415 b107e67f 2018-01-19 stsp 		i++;
416 b107e67f 2018-01-19 stsp 	} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
417 6ccb713b 2018-01-19 stsp 
418 b107e67f 2018-01-19 stsp 	*offset = o;
419 b107e67f 2018-01-19 stsp 	*len = i * sizeof(offN);
420 6ccb713b 2018-01-19 stsp 	return NULL;
421 6ccb713b 2018-01-19 stsp }
422 6ccb713b 2018-01-19 stsp 
423 6ccb713b 2018-01-19 stsp static const struct got_error *
424 b107e67f 2018-01-19 stsp open_offset_delta_object(struct got_object **obj, struct got_repository *repo,
425 b107e67f 2018-01-19 stsp     const char *path_packfile, FILE *packfile, struct got_object_id *id,
426 cecc778e 2018-01-23 stsp     off_t offset, size_t tslen, size_t size)
427 b107e67f 2018-01-19 stsp {
428 b107e67f 2018-01-19 stsp 	const struct got_error *err = NULL;
429 b107e67f 2018-01-19 stsp 	int64_t negoffset;
430 b107e67f 2018-01-19 stsp 	size_t negofflen;
431 b107e67f 2018-01-19 stsp 	off_t base_obj_offset;
432 b107e67f 2018-01-19 stsp 	struct got_object *base_obj;
433 b107e67f 2018-01-19 stsp 	struct got_object_id base_id;
434 b107e67f 2018-01-19 stsp 	uint8_t base_type;
435 b107e67f 2018-01-19 stsp 	uint64_t base_size;
436 b107e67f 2018-01-19 stsp 	size_t base_tslen;
437 b107e67f 2018-01-19 stsp 
438 b107e67f 2018-01-19 stsp 	err = decode_negative_offset(&negoffset, &negofflen, packfile);
439 b107e67f 2018-01-19 stsp 	if (err)
440 b107e67f 2018-01-19 stsp 		return err;
441 b107e67f 2018-01-19 stsp 
442 b107e67f 2018-01-19 stsp 	/* Compute the base object's offset (must be in the same pack file). */
443 b107e67f 2018-01-19 stsp 	base_obj_offset = (offset - negoffset);
444 b107e67f 2018-01-19 stsp 	if (base_obj_offset <= 0)
445 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_BAD_PACKFILE);
446 b107e67f 2018-01-19 stsp 
447 b107e67f 2018-01-19 stsp 	if (fseeko(packfile, base_obj_offset, SEEK_SET) != 0)
448 b107e67f 2018-01-19 stsp 		return got_error_from_errno();
449 b107e67f 2018-01-19 stsp 
450 b107e67f 2018-01-19 stsp 	err = decode_type_and_size(&base_type, &base_size, &base_tslen,
451 b107e67f 2018-01-19 stsp 	    packfile);
452 b107e67f 2018-01-19 stsp 	if (err)
453 b107e67f 2018-01-19 stsp 		return err;
454 b107e67f 2018-01-19 stsp 
455 4e8cda55 2018-01-19 stsp 	/*
456 4e8cda55 2018-01-19 stsp 	 * XXX We currently only support plain objects as a delta base,
457 4e8cda55 2018-01-19 stsp 	 * i.e. deltas cannot be chained. Is this a problem?
458 4e8cda55 2018-01-19 stsp 	 * If so, we would have to resolve a plain object base type here.
459 4e8cda55 2018-01-19 stsp 	 */
460 4e8cda55 2018-01-19 stsp 	switch (base_type) {
461 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_COMMIT:
462 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TREE:
463 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_BLOB:
464 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TAG:
465 4e8cda55 2018-01-19 stsp 		break;
466 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
467 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
468 4e8cda55 2018-01-19 stsp 	default:
469 4e8cda55 2018-01-19 stsp 		return got_error(GOT_ERR_NOT_IMPL);
470 4e8cda55 2018-01-19 stsp 	}
471 4e8cda55 2018-01-19 stsp 
472 b107e67f 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
473 b107e67f 2018-01-19 stsp 	if (*obj == NULL)
474 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_NO_MEM);
475 b107e67f 2018-01-19 stsp 
476 b107e67f 2018-01-19 stsp 	(*obj)->path_packfile = strdup(path_packfile);
477 b107e67f 2018-01-19 stsp 	if ((*obj)->path_packfile == NULL) {
478 b107e67f 2018-01-19 stsp 		free(*obj);
479 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_NO_MEM);
480 b107e67f 2018-01-19 stsp 	}
481 b107e67f 2018-01-19 stsp 	(*obj)->type = GOT_OBJ_TYPE_OFFSET_DELTA;
482 b107e67f 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
483 b107e67f 2018-01-19 stsp 	(*obj)->hdrlen = 0;
484 b107e67f 2018-01-19 stsp 	(*obj)->size = size;
485 b107e67f 2018-01-19 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
486 cecc778e 2018-01-23 stsp 	(*obj)->pack_offset = offset + tslen;
487 b107e67f 2018-01-19 stsp 	(*obj)->base_type = base_type;
488 b107e67f 2018-01-19 stsp 	(*obj)->base_size = base_size;
489 b107e67f 2018-01-19 stsp 	(*obj)->base_obj_offset = base_obj_offset;
490 b107e67f 2018-01-19 stsp 
491 b107e67f 2018-01-19 stsp 	return NULL;
492 b107e67f 2018-01-19 stsp }
493 b107e67f 2018-01-19 stsp 
494 b107e67f 2018-01-19 stsp static const struct got_error *
495 6c00b545 2018-01-17 stsp open_packed_object(struct got_object **obj, struct got_repository *repo,
496 6c00b545 2018-01-17 stsp     const char *path_packdir, struct got_packidx_v2_hdr *packidx,
497 6c00b545 2018-01-17 stsp     struct got_object_id *id)
498 a1fd68d8 2018-01-12 stsp {
499 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
500 a1fd68d8 2018-01-12 stsp 	int idx = get_object_idx(packidx, id);
501 a1fd68d8 2018-01-12 stsp 	off_t offset;
502 a1fd68d8 2018-01-12 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
503 a1fd68d8 2018-01-12 stsp 	char *sha1str;
504 6c00b545 2018-01-17 stsp 	char *path_packfile;
505 6c00b545 2018-01-17 stsp 	FILE *packfile;
506 6c00b545 2018-01-17 stsp 	uint8_t type;
507 6c00b545 2018-01-17 stsp 	uint64_t size;
508 3ee5fc21 2018-01-17 stsp 	size_t tslen;
509 a1fd68d8 2018-01-12 stsp 
510 6c00b545 2018-01-17 stsp 	*obj = NULL;
511 a1fd68d8 2018-01-12 stsp 	if (idx == -1) /* object not found in pack index */
512 a1fd68d8 2018-01-12 stsp 		return NULL;
513 a1fd68d8 2018-01-12 stsp 
514 a1fd68d8 2018-01-12 stsp 	offset = get_object_offset(packidx, idx);
515 a1fd68d8 2018-01-12 stsp 	if (offset == (uint64_t)-1)
516 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
517 a1fd68d8 2018-01-12 stsp 
518 a1fd68d8 2018-01-12 stsp 	sha1str = got_sha1_digest_to_str(packidx->trailer.packfile_sha1,
519 a1fd68d8 2018-01-12 stsp 	    hex, sizeof(hex));
520 a1fd68d8 2018-01-12 stsp 	if (sha1str == NULL)
521 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_PACKIDX_CSUM);
522 a1fd68d8 2018-01-12 stsp 
523 a1fd68d8 2018-01-12 stsp 	if (asprintf(&path_packfile, "%s/%s%s%s", path_packdir,
524 a1fd68d8 2018-01-12 stsp 	    GOT_PACK_PREFIX, sha1str, GOT_PACKFILE_SUFFIX) == -1)
525 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_NO_MEM);
526 a1fd68d8 2018-01-12 stsp 
527 a1fd68d8 2018-01-12 stsp 	packfile = fopen(path_packfile, "rb");
528 a1fd68d8 2018-01-12 stsp 	if (packfile == NULL) {
529 f334529e 2018-01-12 stsp 		err = got_error_from_errno();
530 a1fd68d8 2018-01-12 stsp 		goto done;
531 a1fd68d8 2018-01-12 stsp 	}
532 a1fd68d8 2018-01-12 stsp 
533 a1fd68d8 2018-01-12 stsp 	err = read_packfile_hdr(packfile, packidx);
534 a1fd68d8 2018-01-12 stsp 	if (err)
535 a1fd68d8 2018-01-12 stsp 		goto done;
536 a1fd68d8 2018-01-12 stsp 
537 6c00b545 2018-01-17 stsp 	if (fseeko(packfile, offset, SEEK_SET) != 0) {
538 6c00b545 2018-01-17 stsp 		err = got_error_from_errno();
539 6c00b545 2018-01-17 stsp 		goto done;
540 6c00b545 2018-01-17 stsp 	}
541 6c00b545 2018-01-17 stsp 
542 3ee5fc21 2018-01-17 stsp 	err = decode_type_and_size(&type, &size, &tslen, packfile);
543 a1fd68d8 2018-01-12 stsp 	if (err)
544 a1fd68d8 2018-01-12 stsp 		goto done;
545 a1fd68d8 2018-01-12 stsp 
546 6c00b545 2018-01-17 stsp 	switch (type) {
547 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
548 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
549 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
550 9710aac2 2018-01-19 stsp 		err = open_plain_object(obj, path_packfile, id, type,
551 6ccb713b 2018-01-19 stsp 		    offset + tslen, size);
552 6c00b545 2018-01-17 stsp 		break;
553 6ccb713b 2018-01-19 stsp 
554 b107e67f 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
555 b107e67f 2018-01-19 stsp 		err = open_offset_delta_object(obj, repo, path_packfile,
556 cecc778e 2018-01-23 stsp 		    packfile, id, offset, tslen, size);
557 b107e67f 2018-01-19 stsp 		break;
558 b107e67f 2018-01-19 stsp 
559 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
560 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TAG:
561 b107e67f 2018-01-19 stsp 		break;
562 6c00b545 2018-01-17 stsp 	default:
563 6c00b545 2018-01-17 stsp 		err = got_error(GOT_ERR_NOT_IMPL);
564 6c00b545 2018-01-17 stsp 		goto done;
565 6c00b545 2018-01-17 stsp 	}
566 a1fd68d8 2018-01-12 stsp done:
567 a1fd68d8 2018-01-12 stsp 	free(path_packfile);
568 6c00b545 2018-01-17 stsp 	if (err)
569 6c00b545 2018-01-17 stsp 		free(*obj);
570 f334529e 2018-01-12 stsp 	if (packfile && fclose(packfile) == -1 && err == 0)
571 f334529e 2018-01-12 stsp 		err = got_error_from_errno();
572 a1fd68d8 2018-01-12 stsp 	return err;
573 a1fd68d8 2018-01-12 stsp }
574 a1fd68d8 2018-01-12 stsp 
575 a1fd68d8 2018-01-12 stsp const struct got_error *
576 6c00b545 2018-01-17 stsp got_packfile_open_object(struct got_object **obj, struct got_object_id *id,
577 a1fd68d8 2018-01-12 stsp     struct got_repository *repo)
578 a1fd68d8 2018-01-12 stsp {
579 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
580 a1fd68d8 2018-01-12 stsp 	DIR *packdir = NULL;
581 a1fd68d8 2018-01-12 stsp 	struct dirent *dent;
582 a1fd68d8 2018-01-12 stsp 	char *path_packdir = got_repo_get_path_objects_pack(repo);
583 a1fd68d8 2018-01-12 stsp 
584 a1fd68d8 2018-01-12 stsp 	if (path_packdir == NULL) {
585 a1fd68d8 2018-01-12 stsp 		err = got_error(GOT_ERR_NO_MEM);
586 a1fd68d8 2018-01-12 stsp 		goto done;
587 a1fd68d8 2018-01-12 stsp 	}
588 a1fd68d8 2018-01-12 stsp 
589 a1fd68d8 2018-01-12 stsp 	packdir = opendir(path_packdir);
590 a1fd68d8 2018-01-12 stsp 	if (packdir == NULL) {
591 f334529e 2018-01-12 stsp 		err = got_error_from_errno();
592 a1fd68d8 2018-01-12 stsp 		goto done;
593 a1fd68d8 2018-01-12 stsp 	}
594 a1fd68d8 2018-01-12 stsp 
595 a1fd68d8 2018-01-12 stsp 	while ((dent = readdir(packdir)) != NULL) {
596 a1fd68d8 2018-01-12 stsp 		struct got_packidx_v2_hdr *packidx;
597 a1fd68d8 2018-01-12 stsp 		char *path_packidx, *path_object;
598 a1fd68d8 2018-01-12 stsp 
599 a1fd68d8 2018-01-12 stsp 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
600 a1fd68d8 2018-01-12 stsp 			continue;
601 a1fd68d8 2018-01-12 stsp 
602 a1fd68d8 2018-01-12 stsp 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
603 a1fd68d8 2018-01-12 stsp 		    dent->d_name) == -1) {
604 a1fd68d8 2018-01-12 stsp 			err = got_error(GOT_ERR_NO_MEM);
605 a1fd68d8 2018-01-12 stsp 			goto done;
606 a1fd68d8 2018-01-12 stsp 		}
607 a1fd68d8 2018-01-12 stsp 
608 a1fd68d8 2018-01-12 stsp 		err = got_packidx_open(&packidx, path_packidx);
609 a1fd68d8 2018-01-12 stsp 		free(path_packidx);
610 a1fd68d8 2018-01-12 stsp 		if (err)
611 a1fd68d8 2018-01-12 stsp 			goto done;
612 a1fd68d8 2018-01-12 stsp 
613 6c00b545 2018-01-17 stsp 		err = open_packed_object(obj, repo, path_packdir, packidx, id);
614 bbcf6d65 2018-01-17 stsp 		got_packidx_close(packidx);
615 a1fd68d8 2018-01-12 stsp 		if (err)
616 a1fd68d8 2018-01-12 stsp 			goto done;
617 6c00b545 2018-01-17 stsp 		if (*obj != NULL)
618 a1fd68d8 2018-01-12 stsp 			break;
619 a1fd68d8 2018-01-12 stsp 	}
620 a1fd68d8 2018-01-12 stsp 
621 a1fd68d8 2018-01-12 stsp done:
622 a1fd68d8 2018-01-12 stsp 	free(path_packdir);
623 f334529e 2018-01-12 stsp 	if (packdir && closedir(packdir) != 0 && err == 0)
624 3ee5fc21 2018-01-17 stsp 		err = got_error_from_errno();
625 3ee5fc21 2018-01-17 stsp 	return err;
626 3ee5fc21 2018-01-17 stsp }
627 3ee5fc21 2018-01-17 stsp 
628 3ee5fc21 2018-01-17 stsp static const struct got_error *
629 3ee5fc21 2018-01-17 stsp dump_plain_object(FILE *infile, uint8_t type, size_t size, FILE *outfile)
630 3ee5fc21 2018-01-17 stsp {
631 3ee5fc21 2018-01-17 stsp 	size_t n;
632 3ee5fc21 2018-01-17 stsp 
633 3ee5fc21 2018-01-17 stsp 	while (size > 0) {
634 3ee5fc21 2018-01-17 stsp 		uint8_t data[2048];
635 3ee5fc21 2018-01-17 stsp 		size_t len = MIN(size, sizeof(data));
636 3ee5fc21 2018-01-17 stsp 
637 3ee5fc21 2018-01-17 stsp 		n = fread(data, len, 1, infile);
638 3ee5fc21 2018-01-17 stsp 		if (n != 1)
639 efd2a263 2018-01-19 stsp 			return got_ferror(infile, GOT_ERR_BAD_PACKFILE);
640 3ee5fc21 2018-01-17 stsp 
641 3ee5fc21 2018-01-17 stsp 		n = fwrite(data, len, 1, outfile);
642 3ee5fc21 2018-01-17 stsp 		if (n != 1)
643 efd2a263 2018-01-19 stsp 			return got_ferror(outfile, GOT_ERR_IO);
644 3ee5fc21 2018-01-17 stsp 
645 3ee5fc21 2018-01-17 stsp 		size -= len;
646 3ee5fc21 2018-01-17 stsp 	}
647 3ee5fc21 2018-01-17 stsp 
648 3ee5fc21 2018-01-17 stsp 	rewind(outfile);
649 3ee5fc21 2018-01-17 stsp 	return NULL;
650 3ee5fc21 2018-01-17 stsp }
651 efd2a263 2018-01-19 stsp 
652 efd2a263 2018-01-19 stsp static const struct got_error *
653 efd2a263 2018-01-19 stsp dump_ref_delta_object(struct got_repository *repo, FILE *infile, uint8_t type,
654 efd2a263 2018-01-19 stsp     size_t size, FILE *outfile)
655 efd2a263 2018-01-19 stsp {
656 efd2a263 2018-01-19 stsp 	const struct got_error *err = NULL;
657 efd2a263 2018-01-19 stsp 	struct got_object_id base_id;
658 efd2a263 2018-01-19 stsp 	struct got_object *base_obj;
659 b107e67f 2018-01-19 stsp 	size_t n;
660 3ee5fc21 2018-01-17 stsp 
661 efd2a263 2018-01-19 stsp 	if (size < sizeof(base_id))
662 efd2a263 2018-01-19 stsp 		return got_ferror(infile, GOT_ERR_BAD_PACKFILE);
663 efd2a263 2018-01-19 stsp 
664 efd2a263 2018-01-19 stsp 	n = fread(&base_id, sizeof(base_id), 1, infile);
665 efd2a263 2018-01-19 stsp 	if (n != 1)
666 efd2a263 2018-01-19 stsp 		return got_ferror(infile, GOT_ERR_BAD_PACKFILE);
667 efd2a263 2018-01-19 stsp 
668 efd2a263 2018-01-19 stsp 	size -= sizeof(base_id);
669 efd2a263 2018-01-19 stsp 	if (size <= 0)
670 efd2a263 2018-01-19 stsp 		return got_ferror(infile, GOT_ERR_BAD_PACKFILE);
671 efd2a263 2018-01-19 stsp 
672 efd2a263 2018-01-19 stsp 	err = got_object_open(&base_obj, repo, &base_id);
673 efd2a263 2018-01-19 stsp 	if (err)
674 efd2a263 2018-01-19 stsp 		return err;
675 efd2a263 2018-01-19 stsp 
676 efd2a263 2018-01-19 stsp 	err = got_delta_apply(repo, infile, size, base_obj, outfile);
677 efd2a263 2018-01-19 stsp 	got_object_close(base_obj);
678 efd2a263 2018-01-19 stsp 	return err;
679 efd2a263 2018-01-19 stsp }
680 efd2a263 2018-01-19 stsp 
681 3ee5fc21 2018-01-17 stsp const struct got_error *
682 3ee5fc21 2018-01-17 stsp got_packfile_extract_object(FILE **f, struct got_object *obj,
683 3ee5fc21 2018-01-17 stsp     struct got_repository *repo)
684 3ee5fc21 2018-01-17 stsp {
685 3ee5fc21 2018-01-17 stsp 	const struct got_error *err = NULL;
686 3ee5fc21 2018-01-17 stsp 	FILE *packfile = NULL;
687 3ee5fc21 2018-01-17 stsp 
688 3ee5fc21 2018-01-17 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
689 3ee5fc21 2018-01-17 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
690 3ee5fc21 2018-01-17 stsp 
691 3ee5fc21 2018-01-17 stsp 	*f = got_opentemp();
692 3ee5fc21 2018-01-17 stsp 	if (*f == NULL) {
693 3ee5fc21 2018-01-17 stsp 		err = got_error(GOT_ERR_FILE_OPEN);
694 3ee5fc21 2018-01-17 stsp 		goto done;
695 3ee5fc21 2018-01-17 stsp 	}
696 3ee5fc21 2018-01-17 stsp 
697 3ee5fc21 2018-01-17 stsp 	packfile = fopen(obj->path_packfile, "rb");
698 3ee5fc21 2018-01-17 stsp 	if (packfile == NULL) {
699 f334529e 2018-01-12 stsp 		err = got_error_from_errno();
700 3ee5fc21 2018-01-17 stsp 		goto done;
701 3ee5fc21 2018-01-17 stsp 	}
702 3ee5fc21 2018-01-17 stsp 
703 3ee5fc21 2018-01-17 stsp 	if (fseeko(packfile, obj->pack_offset, SEEK_SET) != 0) {
704 3ee5fc21 2018-01-17 stsp 		err = got_error_from_errno();
705 3ee5fc21 2018-01-17 stsp 		goto done;
706 3ee5fc21 2018-01-17 stsp 	}
707 3ee5fc21 2018-01-17 stsp 
708 3ee5fc21 2018-01-17 stsp 	switch (obj->type) {
709 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
710 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
711 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
712 3ee5fc21 2018-01-17 stsp 		err = dump_plain_object(packfile, obj->type, obj->size, *f);
713 3ee5fc21 2018-01-17 stsp 		break;
714 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
715 efd2a263 2018-01-19 stsp 		err = dump_ref_delta_object(repo, packfile, obj->type,
716 efd2a263 2018-01-19 stsp 		    obj->size, *f);
717 efd2a263 2018-01-19 stsp 		break;
718 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_TAG:
719 3ee5fc21 2018-01-17 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
720 3ee5fc21 2018-01-17 stsp 	default:
721 3ee5fc21 2018-01-17 stsp 		err = got_error(GOT_ERR_NOT_IMPL);
722 3ee5fc21 2018-01-17 stsp 		goto done;
723 3ee5fc21 2018-01-17 stsp 	}
724 3ee5fc21 2018-01-17 stsp done:
725 3ee5fc21 2018-01-17 stsp 	if (packfile)
726 3ee5fc21 2018-01-17 stsp 		fclose(packfile);
727 3ee5fc21 2018-01-17 stsp 	if (err && *f)
728 3ee5fc21 2018-01-17 stsp 		fclose(*f);
729 a1fd68d8 2018-01-12 stsp 	return err;
730 a1fd68d8 2018-01-12 stsp }