1 0a0a3048 2018-01-10 stsp /*
   2 5aa81393 2020-01-06 stsp  * Copyright (c) 2018, 2019, 2020 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 876c234b 2018-09-10 stsp #include <sys/uio.h>
  20 57b35b75 2018-06-22 stsp #include <sys/mman.h>
  21 0a0a3048 2018-01-10 stsp 
  22 7e656b93 2018-03-17 stsp #include <fcntl.h>
  23 a1fd68d8 2018-01-12 stsp #include <errno.h>
  24 0a0a3048 2018-01-10 stsp #include <stdio.h>
  25 a1fd68d8 2018-01-12 stsp #include <stdint.h>
  26 0a0a3048 2018-01-10 stsp #include <stdlib.h>
  27 0a0a3048 2018-01-10 stsp #include <string.h>
  28 0a0a3048 2018-01-10 stsp #include <limits.h>
  29 81a12da5 2020-09-09 naddy #include <unistd.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 324d37e7 2019-05-11 stsp #include "got_path.h"
  35 0a0a3048 2018-01-10 stsp 
  36 718b3ab0 2018-03-17 stsp #include "got_lib_sha1.h"
  37 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
  38 ab2f42e7 2019-11-10 stsp #include "got_lib_delta_cache.h"
  39 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
  40 718b3ab0 2018-03-17 stsp #include "got_lib_object.h"
  41 dd88155e 2019-06-29 stsp #include "got_lib_object_parse.h"
  42 876c234b 2018-09-10 stsp #include "got_lib_privsep.h"
  43 15a94983 2018-12-23 stsp #include "got_lib_pack.h"
  44 79b11c62 2018-03-09 stsp 
  45 79b11c62 2018-03-09 stsp #ifndef nitems
  46 79b11c62 2018-03-09 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  47 79b11c62 2018-03-09 stsp #endif
  48 1411938b 2018-02-12 stsp 
  49 a1fd68d8 2018-01-12 stsp #ifndef MIN
  50 a1fd68d8 2018-01-12 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  51 a1fd68d8 2018-01-12 stsp #endif
  52 a1fd68d8 2018-01-12 stsp 
  53 0a0a3048 2018-01-10 stsp static const struct got_error *
  54 0a0a3048 2018-01-10 stsp verify_fanout_table(uint32_t *fanout_table)
  55 0a0a3048 2018-01-10 stsp {
  56 0a0a3048 2018-01-10 stsp 	int i;
  57 0a0a3048 2018-01-10 stsp 
  58 0a0a3048 2018-01-10 stsp 	for (i = 0; i < 0xff - 1; i++) {
  59 a1fd68d8 2018-01-12 stsp 		if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
  60 0a0a3048 2018-01-10 stsp 			return got_error(GOT_ERR_BAD_PACKIDX);
  61 0a0a3048 2018-01-10 stsp 	}
  62 0a0a3048 2018-01-10 stsp 
  63 0a0a3048 2018-01-10 stsp 	return NULL;
  64 0a0a3048 2018-01-10 stsp }
  65 0a0a3048 2018-01-10 stsp 
  66 1510f469 2018-09-09 stsp const struct got_error *
  67 c3564dfa 2021-07-15 stsp got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
  68 0a0a3048 2018-01-10 stsp {
  69 0a0a3048 2018-01-10 stsp 	const struct got_error *err = NULL;
  70 817c5a18 2018-09-09 stsp 	struct got_packidx_v2_hdr *h;
  71 0ebaf008 2018-01-10 stsp 	SHA1_CTX ctx;
  72 0ebaf008 2018-01-10 stsp 	uint8_t sha1[SHA1_DIGEST_LENGTH];
  73 817c5a18 2018-09-09 stsp 	size_t nobj, len_fanout, len_ids, offset, remain;
  74 817c5a18 2018-09-09 stsp 	ssize_t n;
  75 5e6be232 2019-11-08 stsp 	int i;
  76 0a0a3048 2018-01-10 stsp 
  77 0ebaf008 2018-01-10 stsp 	SHA1Init(&ctx);
  78 0ebaf008 2018-01-10 stsp 
  79 57b35b75 2018-06-22 stsp 	h = &p->hdr;
  80 57b35b75 2018-06-22 stsp 	offset = 0;
  81 57b35b75 2018-06-22 stsp 	remain = p->len;
  82 0a0a3048 2018-01-10 stsp 
  83 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->magic)) {
  84 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
  85 0a0a3048 2018-01-10 stsp 		goto done;
  86 0a0a3048 2018-01-10 stsp 	}
  87 fc79a48d 2018-07-09 stsp 	if (p->map)
  88 fc79a48d 2018-07-09 stsp 		h->magic = (uint32_t *)(p->map + offset);
  89 fc79a48d 2018-07-09 stsp 	else {
  90 fc79a48d 2018-07-09 stsp 		h->magic = malloc(sizeof(*h->magic));
  91 fc79a48d 2018-07-09 stsp 		if (h->magic == NULL) {
  92 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
  93 fc79a48d 2018-07-09 stsp 			goto done;
  94 fc79a48d 2018-07-09 stsp 		}
  95 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->magic, sizeof(*h->magic));
  96 b1317e77 2019-09-22 stsp 		if (n < 0) {
  97 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
  98 b1317e77 2019-09-22 stsp 			goto done;
  99 b1317e77 2019-09-22 stsp 		} else if (n != sizeof(*h->magic)) {
 100 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 101 fc79a48d 2018-07-09 stsp 			goto done;
 102 fc79a48d 2018-07-09 stsp 		}
 103 fc79a48d 2018-07-09 stsp 	}
 104 ac62b712 2021-03-30 stsp 	if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
 105 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 106 57b35b75 2018-06-22 stsp 		goto done;
 107 57b35b75 2018-06-22 stsp 	}
 108 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->magic);
 109 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->magic);
 110 0a0a3048 2018-01-10 stsp 
 111 0cb74cf4 2018-07-08 stsp 	if (verify)
 112 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
 113 0ebaf008 2018-01-10 stsp 
 114 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->version)) {
 115 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 116 0a0a3048 2018-01-10 stsp 		goto done;
 117 0a0a3048 2018-01-10 stsp 	}
 118 fc79a48d 2018-07-09 stsp 	if (p->map)
 119 fc79a48d 2018-07-09 stsp 		h->version = (uint32_t *)(p->map + offset);
 120 fc79a48d 2018-07-09 stsp 	else {
 121 fc79a48d 2018-07-09 stsp 		h->version = malloc(sizeof(*h->version));
 122 fc79a48d 2018-07-09 stsp 		if (h->version == NULL) {
 123 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 124 fc79a48d 2018-07-09 stsp 			goto done;
 125 fc79a48d 2018-07-09 stsp 		}
 126 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->version, sizeof(*h->version));
 127 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 128 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 129 c6368c2e 2019-10-11 stsp 			goto done;
 130 c6368c2e 2019-10-11 stsp 		} else if (n != sizeof(*h->version)) {
 131 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 132 fc79a48d 2018-07-09 stsp 			goto done;
 133 fc79a48d 2018-07-09 stsp 		}
 134 fc79a48d 2018-07-09 stsp 	}
 135 ac62b712 2021-03-30 stsp 	if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
 136 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 137 0a0a3048 2018-01-10 stsp 		goto done;
 138 0a0a3048 2018-01-10 stsp 	}
 139 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->version);
 140 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->version);
 141 0a0a3048 2018-01-10 stsp 
 142 0cb74cf4 2018-07-08 stsp 	if (verify)
 143 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
 144 0ebaf008 2018-01-10 stsp 
 145 57b35b75 2018-06-22 stsp 	len_fanout =
 146 57b35b75 2018-06-22 stsp 	    sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
 147 57b35b75 2018-06-22 stsp 	if (remain < len_fanout) {
 148 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 149 0a0a3048 2018-01-10 stsp 		goto done;
 150 0a0a3048 2018-01-10 stsp 	}
 151 fc79a48d 2018-07-09 stsp 	if (p->map)
 152 fc79a48d 2018-07-09 stsp 		h->fanout_table = (uint32_t *)(p->map + offset);
 153 fc79a48d 2018-07-09 stsp 	else {
 154 fc79a48d 2018-07-09 stsp 		h->fanout_table = malloc(len_fanout);
 155 fc79a48d 2018-07-09 stsp 		if (h->fanout_table == NULL) {
 156 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 157 fc79a48d 2018-07-09 stsp 			goto done;
 158 fc79a48d 2018-07-09 stsp 		}
 159 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->fanout_table, len_fanout);
 160 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 161 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 162 c6368c2e 2019-10-11 stsp 			goto done;
 163 c6368c2e 2019-10-11 stsp 		} else if (n != len_fanout) {
 164 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 165 fc79a48d 2018-07-09 stsp 			goto done;
 166 fc79a48d 2018-07-09 stsp 		}
 167 fc79a48d 2018-07-09 stsp 	}
 168 c8262310 2018-06-04 stsp 	err = verify_fanout_table(h->fanout_table);
 169 0a0a3048 2018-01-10 stsp 	if (err)
 170 0a0a3048 2018-01-10 stsp 		goto done;
 171 0cb74cf4 2018-07-08 stsp 	if (verify)
 172 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
 173 57b35b75 2018-06-22 stsp 	offset += len_fanout;
 174 57b35b75 2018-06-22 stsp 	remain -= len_fanout;
 175 0a0a3048 2018-01-10 stsp 
 176 78fb0967 2020-09-09 naddy 	nobj = be32toh(h->fanout_table[0xff]);
 177 57b35b75 2018-06-22 stsp 	len_ids = nobj * sizeof(*h->sorted_ids);
 178 57b35b75 2018-06-22 stsp 	if (len_ids <= nobj || len_ids > remain) {
 179 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 180 0a0a3048 2018-01-10 stsp 		goto done;
 181 0a0a3048 2018-01-10 stsp 	}
 182 fc79a48d 2018-07-09 stsp 	if (p->map)
 183 fc79a48d 2018-07-09 stsp 		h->sorted_ids =
 184 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
 185 fc79a48d 2018-07-09 stsp 	else {
 186 fc79a48d 2018-07-09 stsp 		h->sorted_ids = malloc(len_ids);
 187 fc79a48d 2018-07-09 stsp 		if (h->sorted_ids == NULL) {
 188 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 189 fc79a48d 2018-07-09 stsp 			goto done;
 190 fc79a48d 2018-07-09 stsp 		}
 191 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->sorted_ids, len_ids);
 192 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 193 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 194 faaa1c0f 2018-09-15 stsp 		else if (n != len_ids) {
 195 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 196 fc79a48d 2018-07-09 stsp 			goto done;
 197 fc79a48d 2018-07-09 stsp 		}
 198 fc79a48d 2018-07-09 stsp 	}
 199 0cb74cf4 2018-07-08 stsp 	if (verify)
 200 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
 201 57b35b75 2018-06-22 stsp 	offset += len_ids;
 202 57b35b75 2018-06-22 stsp 	remain -= len_ids;
 203 0a0a3048 2018-01-10 stsp 
 204 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->crc32)) {
 205 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 206 0a0a3048 2018-01-10 stsp 		goto done;
 207 0a0a3048 2018-01-10 stsp 	}
 208 fc79a48d 2018-07-09 stsp 	if (p->map)
 209 fc79a48d 2018-07-09 stsp 		h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
 210 fc79a48d 2018-07-09 stsp 	else {
 211 fc79a48d 2018-07-09 stsp 		h->crc32 = malloc(nobj * sizeof(*h->crc32));
 212 fc79a48d 2018-07-09 stsp 		if (h->crc32 == NULL) {
 213 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 214 fc79a48d 2018-07-09 stsp 			goto done;
 215 fc79a48d 2018-07-09 stsp 		}
 216 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
 217 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 218 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 219 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->crc32)) {
 220 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 221 fc79a48d 2018-07-09 stsp 			goto done;
 222 fc79a48d 2018-07-09 stsp 		}
 223 fc79a48d 2018-07-09 stsp 	}
 224 0cb74cf4 2018-07-08 stsp 	if (verify)
 225 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
 226 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->crc32);
 227 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->crc32);
 228 0ebaf008 2018-01-10 stsp 
 229 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->offsets)) {
 230 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 231 0a0a3048 2018-01-10 stsp 		goto done;
 232 0a0a3048 2018-01-10 stsp 	}
 233 fc79a48d 2018-07-09 stsp 	if (p->map)
 234 fc79a48d 2018-07-09 stsp 		h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
 235 fc79a48d 2018-07-09 stsp 	else {
 236 fc79a48d 2018-07-09 stsp 		h->offsets = malloc(nobj * sizeof(*h->offsets));
 237 fc79a48d 2018-07-09 stsp 		if (h->offsets == NULL) {
 238 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 239 fc79a48d 2018-07-09 stsp 			goto done;
 240 fc79a48d 2018-07-09 stsp 		}
 241 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
 242 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 243 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 244 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->offsets)) {
 245 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 246 fc79a48d 2018-07-09 stsp 			goto done;
 247 fc79a48d 2018-07-09 stsp 		}
 248 fc79a48d 2018-07-09 stsp 	}
 249 0cb74cf4 2018-07-08 stsp 	if (verify)
 250 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->offsets,
 251 0cb74cf4 2018-07-08 stsp 		    nobj * sizeof(*h->offsets));
 252 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->offsets);
 253 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->offsets);
 254 0ebaf008 2018-01-10 stsp 
 255 0a0a3048 2018-01-10 stsp 	/* Large file offsets are contained only in files > 2GB. */
 256 c3564dfa 2021-07-15 stsp 	if (verify || packfile_size > 0x7fffffff) {
 257 c3564dfa 2021-07-15 stsp 		for (i = 0; i < nobj; i++) {
 258 c3564dfa 2021-07-15 stsp 			uint32_t o = h->offsets[i];
 259 c3564dfa 2021-07-15 stsp 			if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
 260 c3564dfa 2021-07-15 stsp 				p->nlargeobj++;
 261 c3564dfa 2021-07-15 stsp 		}
 262 5e6be232 2019-11-08 stsp 	}
 263 5e6be232 2019-11-08 stsp 	if (p->nlargeobj == 0)
 264 0a0a3048 2018-01-10 stsp 		goto checksum;
 265 c3564dfa 2021-07-15 stsp 	else if (packfile_size <= 0x7fffffff) {
 266 c3564dfa 2021-07-15 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 267 c3564dfa 2021-07-15 stsp 		goto done;
 268 c3564dfa 2021-07-15 stsp 	}
 269 0a0a3048 2018-01-10 stsp 
 270 5e6be232 2019-11-08 stsp 	if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
 271 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 272 0a0a3048 2018-01-10 stsp 		goto done;
 273 0a0a3048 2018-01-10 stsp 	}
 274 fc79a48d 2018-07-09 stsp 	if (p->map)
 275 fc79a48d 2018-07-09 stsp 		h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
 276 fc79a48d 2018-07-09 stsp 	else {
 277 5e6be232 2019-11-08 stsp 		h->large_offsets = malloc(p->nlargeobj *
 278 5e6be232 2019-11-08 stsp 		    sizeof(*h->large_offsets));
 279 de30857e 2019-08-23 stsp 		if (h->large_offsets == NULL) {
 280 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 281 fc79a48d 2018-07-09 stsp 			goto done;
 282 fc79a48d 2018-07-09 stsp 		}
 283 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->large_offsets,
 284 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 285 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 286 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 287 5e6be232 2019-11-08 stsp 		else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
 288 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 289 fc79a48d 2018-07-09 stsp 			goto done;
 290 fc79a48d 2018-07-09 stsp 		}
 291 fc79a48d 2018-07-09 stsp 	}
 292 0cb74cf4 2018-07-08 stsp 	if (verify)
 293 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t*)h->large_offsets,
 294 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 295 5e6be232 2019-11-08 stsp 	remain -= p->nlargeobj * sizeof(*h->large_offsets);
 296 5e6be232 2019-11-08 stsp 	offset += p->nlargeobj * sizeof(*h->large_offsets);
 297 0ebaf008 2018-01-10 stsp 
 298 0a0a3048 2018-01-10 stsp checksum:
 299 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->trailer)) {
 300 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 301 0a0a3048 2018-01-10 stsp 		goto done;
 302 0a0a3048 2018-01-10 stsp 	}
 303 fc79a48d 2018-07-09 stsp 	if (p->map)
 304 fc79a48d 2018-07-09 stsp 		h->trailer =
 305 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
 306 fc79a48d 2018-07-09 stsp 	else {
 307 fc79a48d 2018-07-09 stsp 		h->trailer = malloc(sizeof(*h->trailer));
 308 fc79a48d 2018-07-09 stsp 		if (h->trailer == NULL) {
 309 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 310 fc79a48d 2018-07-09 stsp 			goto done;
 311 fc79a48d 2018-07-09 stsp 		}
 312 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->trailer, sizeof(*h->trailer));
 313 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 314 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 315 faaa1c0f 2018-09-15 stsp 		else if (n != sizeof(*h->trailer)) {
 316 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 317 fc79a48d 2018-07-09 stsp 			goto done;
 318 fc79a48d 2018-07-09 stsp 		}
 319 fc79a48d 2018-07-09 stsp 	}
 320 0cb74cf4 2018-07-08 stsp 	if (verify) {
 321 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
 322 0cb74cf4 2018-07-08 stsp 		SHA1Final(sha1, &ctx);
 323 0cb74cf4 2018-07-08 stsp 		if (memcmp(h->trailer->packidx_sha1, sha1,
 324 0cb74cf4 2018-07-08 stsp 		    SHA1_DIGEST_LENGTH) != 0)
 325 0cb74cf4 2018-07-08 stsp 			err = got_error(GOT_ERR_PACKIDX_CSUM);
 326 0cb74cf4 2018-07-08 stsp 	}
 327 0a0a3048 2018-01-10 stsp done:
 328 817c5a18 2018-09-09 stsp 	return err;
 329 817c5a18 2018-09-09 stsp }
 330 817c5a18 2018-09-09 stsp 
 331 817c5a18 2018-09-09 stsp const struct got_error *
 332 6d5a9006 2020-12-16 yzhong got_packidx_open(struct got_packidx **packidx,
 333 6d5a9006 2020-12-16 yzhong     int dir_fd, const char *relpath, int verify)
 334 817c5a18 2018-09-09 stsp {
 335 817c5a18 2018-09-09 stsp 	const struct got_error *err = NULL;
 336 1124fe40 2021-07-07 stsp 	struct got_packidx *p = NULL;
 337 1124fe40 2021-07-07 stsp 	char *pack_relpath;
 338 c3564dfa 2021-07-15 stsp 	struct stat idx_sb, pack_sb;
 339 817c5a18 2018-09-09 stsp 
 340 817c5a18 2018-09-09 stsp 	*packidx = NULL;
 341 1124fe40 2021-07-07 stsp 
 342 1124fe40 2021-07-07 stsp 	err = got_packidx_get_packfile_path(&pack_relpath, relpath);
 343 1124fe40 2021-07-07 stsp 	if (err)
 344 1124fe40 2021-07-07 stsp 		return err;
 345 1124fe40 2021-07-07 stsp 
 346 1124fe40 2021-07-07 stsp 	/*
 347 1124fe40 2021-07-07 stsp 	 * Ensure that a corresponding pack file exists.
 348 1124fe40 2021-07-07 stsp 	 * Some Git repositories have this problem. Git seems to ignore
 349 1124fe40 2021-07-07 stsp 	 * the existence of lonely pack index files but we do not.
 350 1124fe40 2021-07-07 stsp 	 */
 351 c3564dfa 2021-07-15 stsp 	if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
 352 1124fe40 2021-07-07 stsp 		if (errno == ENOENT) {
 353 1124fe40 2021-07-07 stsp 			err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
 354 1124fe40 2021-07-07 stsp 			    "%s", relpath);
 355 1124fe40 2021-07-07 stsp 		} else
 356 1124fe40 2021-07-07 stsp 			err = got_error_from_errno2("fstatat", pack_relpath);
 357 1124fe40 2021-07-07 stsp 		goto done;
 358 1124fe40 2021-07-07 stsp 	}
 359 817c5a18 2018-09-09 stsp 
 360 817c5a18 2018-09-09 stsp 	p = calloc(1, sizeof(*p));
 361 1124fe40 2021-07-07 stsp 	if (p == NULL) {
 362 1124fe40 2021-07-07 stsp 		err = got_error_from_errno("calloc");
 363 1124fe40 2021-07-07 stsp 		goto done;
 364 1124fe40 2021-07-07 stsp 	}
 365 817c5a18 2018-09-09 stsp 
 366 fc63f50d 2021-12-31 thomas 	p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 367 6772cf22 2019-08-28 hiltjo 	if (p->fd == -1) {
 368 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("openat", relpath);
 369 1124fe40 2021-07-07 stsp 		goto done;
 370 6772cf22 2019-08-28 hiltjo 	}
 371 817c5a18 2018-09-09 stsp 
 372 c3564dfa 2021-07-15 stsp 	if (fstat(p->fd, &idx_sb) != 0) {
 373 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("fstat", relpath);
 374 1124fe40 2021-07-07 stsp 		goto done;
 375 817c5a18 2018-09-09 stsp 	}
 376 c3564dfa 2021-07-15 stsp 	p->len = idx_sb.st_size;
 377 817c5a18 2018-09-09 stsp 	if (p->len < sizeof(p->hdr)) {
 378 817c5a18 2018-09-09 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 379 1124fe40 2021-07-07 stsp 		goto done;
 380 817c5a18 2018-09-09 stsp 	}
 381 817c5a18 2018-09-09 stsp 
 382 6d5a9006 2020-12-16 yzhong 	p->path_packidx = strdup(relpath);
 383 817c5a18 2018-09-09 stsp 	if (p->path_packidx == NULL) {
 384 638f9024 2019-05-13 stsp 		err = got_error_from_errno("strdup");
 385 817c5a18 2018-09-09 stsp 		goto done;
 386 817c5a18 2018-09-09 stsp 	}
 387 817c5a18 2018-09-09 stsp 
 388 817c5a18 2018-09-09 stsp #ifndef GOT_PACK_NO_MMAP
 389 817c5a18 2018-09-09 stsp 	p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
 390 3a11398b 2019-02-21 stsp 	if (p->map == MAP_FAILED) {
 391 3a11398b 2019-02-21 stsp 		if (errno != ENOMEM) {
 392 638f9024 2019-05-13 stsp 			err = got_error_from_errno("mmap");
 393 3a11398b 2019-02-21 stsp 			goto done;
 394 3a11398b 2019-02-21 stsp 		}
 395 817c5a18 2018-09-09 stsp 		p->map = NULL; /* fall back to read(2) */
 396 3a11398b 2019-02-21 stsp 	}
 397 817c5a18 2018-09-09 stsp #endif
 398 817c5a18 2018-09-09 stsp 
 399 c3564dfa 2021-07-15 stsp 	err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
 400 817c5a18 2018-09-09 stsp done:
 401 1124fe40 2021-07-07 stsp 	if (err) {
 402 1124fe40 2021-07-07 stsp 		if (p)
 403 1124fe40 2021-07-07 stsp 			got_packidx_close(p);
 404 1124fe40 2021-07-07 stsp 	} else
 405 0a0a3048 2018-01-10 stsp 		*packidx = p;
 406 1124fe40 2021-07-07 stsp 	free(pack_relpath);
 407 0a0a3048 2018-01-10 stsp 	return err;
 408 0a0a3048 2018-01-10 stsp }
 409 0a0a3048 2018-01-10 stsp 
 410 57b35b75 2018-06-22 stsp const struct got_error *
 411 6fd11751 2018-06-04 stsp got_packidx_close(struct got_packidx *packidx)
 412 0a0a3048 2018-01-10 stsp {
 413 57b35b75 2018-06-22 stsp 	const struct got_error *err = NULL;
 414 57b35b75 2018-06-22 stsp 
 415 6fd11751 2018-06-04 stsp 	free(packidx->path_packidx);
 416 fc79a48d 2018-07-09 stsp 	if (packidx->map) {
 417 57b35b75 2018-06-22 stsp 		if (munmap(packidx->map, packidx->len) == -1)
 418 638f9024 2019-05-13 stsp 			err = got_error_from_errno("munmap");
 419 fc79a48d 2018-07-09 stsp 	} else {
 420 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.magic);
 421 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.version);
 422 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.fanout_table);
 423 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.sorted_ids);
 424 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.crc32);
 425 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.offsets);
 426 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.large_offsets);
 427 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.trailer);
 428 57b35b75 2018-06-22 stsp 	}
 429 08578a35 2021-01-22 stsp 	if (close(packidx->fd) == -1 && err == NULL)
 430 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 431 f9c2e8e5 2022-02-13 thomas 	free(packidx->sorted_offsets);
 432 f9c2e8e5 2022-02-13 thomas 	free(packidx->sorted_large_offsets);
 433 0a0a3048 2018-01-10 stsp 	free(packidx);
 434 57b35b75 2018-06-22 stsp 
 435 57b35b75 2018-06-22 stsp 	return err;
 436 a1fd68d8 2018-01-12 stsp }
 437 509c9973 2021-04-10 stsp 
 438 509c9973 2021-04-10 stsp const struct got_error *
 439 aea75d87 2021-07-06 stsp got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
 440 509c9973 2021-04-10 stsp {
 441 509c9973 2021-04-10 stsp 	size_t size;
 442 509c9973 2021-04-10 stsp 
 443 509c9973 2021-04-10 stsp 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
 444 aea75d87 2021-07-06 stsp 	size = strlen(path_packidx) + 2;
 445 509c9973 2021-04-10 stsp 	if (size < GOT_PACKFILE_NAMELEN + 1)
 446 aea75d87 2021-07-06 stsp 		return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
 447 a1fd68d8 2018-01-12 stsp 
 448 509c9973 2021-04-10 stsp 	*path_packfile = malloc(size);
 449 509c9973 2021-04-10 stsp 	if (*path_packfile == NULL)
 450 509c9973 2021-04-10 stsp 		return got_error_from_errno("malloc");
 451 509c9973 2021-04-10 stsp 
 452 509c9973 2021-04-10 stsp 	/* Copy up to and excluding ".idx". */
 453 aea75d87 2021-07-06 stsp 	if (strlcpy(*path_packfile, path_packidx,
 454 509c9973 2021-04-10 stsp 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
 455 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 456 509c9973 2021-04-10 stsp 
 457 509c9973 2021-04-10 stsp 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
 458 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 459 509c9973 2021-04-10 stsp 
 460 509c9973 2021-04-10 stsp 	return NULL;
 461 509c9973 2021-04-10 stsp }
 462 509c9973 2021-04-10 stsp 
 463 02828bfd 2021-06-22 stsp off_t
 464 02828bfd 2021-06-22 stsp got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
 465 a1fd68d8 2018-01-12 stsp {
 466 78fb0967 2020-09-09 naddy 	uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
 467 a1fd68d8 2018-01-12 stsp 	if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 468 a1fd68d8 2018-01-12 stsp 		uint64_t loffset;
 469 a1fd68d8 2018-01-12 stsp 		idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 470 5e6be232 2019-11-08 stsp 		if (idx < 0 || idx >= packidx->nlargeobj ||
 471 6fd11751 2018-06-04 stsp 		    packidx->hdr.large_offsets == NULL)
 472 a1fd68d8 2018-01-12 stsp 			return -1;
 473 78fb0967 2020-09-09 naddy 		loffset = be64toh(packidx->hdr.large_offsets[idx]);
 474 a1fd68d8 2018-01-12 stsp 		return (loffset > INT64_MAX ? -1 : (off_t)loffset);
 475 a1fd68d8 2018-01-12 stsp 	}
 476 a1fd68d8 2018-01-12 stsp 	return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
 477 a1fd68d8 2018-01-12 stsp }
 478 a1fd68d8 2018-01-12 stsp 
 479 1510f469 2018-09-09 stsp int
 480 48b4f239 2021-12-31 thomas got_packidx_get_object_idx(struct got_packidx *packidx,
 481 48b4f239 2021-12-31 thomas     struct got_object_id *id)
 482 a1fd68d8 2018-01-12 stsp {
 483 00927983 2020-04-19 stsp 	u_int8_t id0 = id->sha1[0];
 484 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 485 40aeb19c 2018-06-22 stsp 	int left = 0, right = totobj - 1;
 486 a1fd68d8 2018-01-12 stsp 
 487 a1fd68d8 2018-01-12 stsp 	if (id0 > 0)
 488 78fb0967 2020-09-09 naddy 		left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 489 a1fd68d8 2018-01-12 stsp 
 490 40aeb19c 2018-06-22 stsp 	while (left <= right) {
 491 57b35b75 2018-06-22 stsp 		struct got_packidx_object_id *oid;
 492 40aeb19c 2018-06-22 stsp 		int i, cmp;
 493 a1fd68d8 2018-01-12 stsp 
 494 40aeb19c 2018-06-22 stsp 		i = ((left + right) / 2);
 495 40aeb19c 2018-06-22 stsp 		oid = &packidx->hdr.sorted_ids[i];
 496 00927983 2020-04-19 stsp 		cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 497 16dcbf91 2018-04-01 stsp 		if (cmp == 0)
 498 6c00b545 2018-01-17 stsp 			return i;
 499 40aeb19c 2018-06-22 stsp 		else if (cmp > 0)
 500 40aeb19c 2018-06-22 stsp 			left = i + 1;
 501 40aeb19c 2018-06-22 stsp 		else if (cmp < 0)
 502 40aeb19c 2018-06-22 stsp 			right = i - 1;
 503 a1fd68d8 2018-01-12 stsp 	}
 504 a1fd68d8 2018-01-12 stsp 
 505 a1fd68d8 2018-01-12 stsp 	return -1;
 506 f9c2e8e5 2022-02-13 thomas }
 507 f9c2e8e5 2022-02-13 thomas 
 508 f9c2e8e5 2022-02-13 thomas static int
 509 f9c2e8e5 2022-02-13 thomas offset_cmp(const void *pa, const void *pb)
 510 f9c2e8e5 2022-02-13 thomas {
 511 f9c2e8e5 2022-02-13 thomas 	const struct got_pack_offset_index *a, *b;
 512 f9c2e8e5 2022-02-13 thomas 
 513 f9c2e8e5 2022-02-13 thomas 	a = (const struct got_pack_offset_index *)pa;
 514 f9c2e8e5 2022-02-13 thomas 	b = (const struct got_pack_offset_index *)pb;
 515 f9c2e8e5 2022-02-13 thomas 
 516 f9c2e8e5 2022-02-13 thomas 	if (a->offset < b->offset)
 517 f9c2e8e5 2022-02-13 thomas 		return -1;
 518 f9c2e8e5 2022-02-13 thomas 	else if (a->offset > b->offset)
 519 f9c2e8e5 2022-02-13 thomas 		return 1;
 520 f9c2e8e5 2022-02-13 thomas 
 521 f9c2e8e5 2022-02-13 thomas 	return 0;
 522 876c234b 2018-09-10 stsp }
 523 876c234b 2018-09-10 stsp 
 524 f9c2e8e5 2022-02-13 thomas static int
 525 f9c2e8e5 2022-02-13 thomas large_offset_cmp(const void *pa, const void *pb)
 526 f9c2e8e5 2022-02-13 thomas {
 527 f9c2e8e5 2022-02-13 thomas 	const struct got_pack_large_offset_index *a, *b;
 528 f9c2e8e5 2022-02-13 thomas 
 529 f9c2e8e5 2022-02-13 thomas 	a = (const struct got_pack_large_offset_index *)pa;
 530 f9c2e8e5 2022-02-13 thomas 	b = (const struct got_pack_large_offset_index *)pb;
 531 f9c2e8e5 2022-02-13 thomas 
 532 f9c2e8e5 2022-02-13 thomas 	if (a->offset < b->offset)
 533 f9c2e8e5 2022-02-13 thomas 		return -1;
 534 f9c2e8e5 2022-02-13 thomas 	else if (a->offset > b->offset)
 535 f9c2e8e5 2022-02-13 thomas 		return 1;
 536 f9c2e8e5 2022-02-13 thomas 
 537 f9c2e8e5 2022-02-13 thomas 	return 0;
 538 f9c2e8e5 2022-02-13 thomas }
 539 f9c2e8e5 2022-02-13 thomas 
 540 f9c2e8e5 2022-02-13 thomas static const struct got_error *
 541 f9c2e8e5 2022-02-13 thomas build_offset_index(struct got_packidx *p)
 542 f9c2e8e5 2022-02-13 thomas {
 543 f9c2e8e5 2022-02-13 thomas 	uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
 544 f9c2e8e5 2022-02-13 thomas 	unsigned int i, j, k;
 545 f9c2e8e5 2022-02-13 thomas 
 546 f9c2e8e5 2022-02-13 thomas 	p->sorted_offsets = calloc(nobj - p->nlargeobj,
 547 f9c2e8e5 2022-02-13 thomas 	    sizeof(p->sorted_offsets[0]));
 548 f9c2e8e5 2022-02-13 thomas 	if (p->sorted_offsets == NULL)
 549 f9c2e8e5 2022-02-13 thomas 		return got_error_from_errno("calloc");
 550 f9c2e8e5 2022-02-13 thomas 
 551 f9c2e8e5 2022-02-13 thomas 	if (p->nlargeobj > 0) {
 552 f9c2e8e5 2022-02-13 thomas 		p->sorted_large_offsets = calloc(p->nlargeobj,
 553 f9c2e8e5 2022-02-13 thomas 		    sizeof(p->sorted_large_offsets[0]));
 554 f9c2e8e5 2022-02-13 thomas 		if (p->sorted_large_offsets == NULL)
 555 f9c2e8e5 2022-02-13 thomas 			return got_error_from_errno("calloc");
 556 f9c2e8e5 2022-02-13 thomas 	}
 557 f9c2e8e5 2022-02-13 thomas 
 558 f9c2e8e5 2022-02-13 thomas 	j = 0;
 559 f9c2e8e5 2022-02-13 thomas 	k = 0;
 560 f9c2e8e5 2022-02-13 thomas 	for (i = 0; i < nobj; i++) {
 561 f9c2e8e5 2022-02-13 thomas 		uint32_t offset = be32toh(p->hdr.offsets[i]);
 562 f9c2e8e5 2022-02-13 thomas 		if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 563 f9c2e8e5 2022-02-13 thomas 			uint64_t loffset;
 564 f9c2e8e5 2022-02-13 thomas 			uint32_t idx;
 565 f9c2e8e5 2022-02-13 thomas 			idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 566 f9c2e8e5 2022-02-13 thomas 			if (idx >= p->nlargeobj ||
 567 f9c2e8e5 2022-02-13 thomas 			    p->nlargeobj == 0 ||
 568 f9c2e8e5 2022-02-13 thomas 			    p->hdr.large_offsets == NULL)
 569 f9c2e8e5 2022-02-13 thomas 				return got_error(GOT_ERR_BAD_PACKIDX);
 570 f9c2e8e5 2022-02-13 thomas 			loffset = be64toh(p->hdr.large_offsets[idx]);
 571 f9c2e8e5 2022-02-13 thomas 			p->sorted_large_offsets[j].offset = loffset;
 572 f9c2e8e5 2022-02-13 thomas 			p->sorted_large_offsets[j].idx = i;
 573 f9c2e8e5 2022-02-13 thomas 			j++;
 574 f9c2e8e5 2022-02-13 thomas 		} else {
 575 f9c2e8e5 2022-02-13 thomas 			p->sorted_offsets[k].offset = offset;
 576 f9c2e8e5 2022-02-13 thomas 			p->sorted_offsets[k].idx = i;
 577 f9c2e8e5 2022-02-13 thomas 			k++;
 578 f9c2e8e5 2022-02-13 thomas 		}
 579 f9c2e8e5 2022-02-13 thomas 	}
 580 f9c2e8e5 2022-02-13 thomas 	if (j != p->nlargeobj || k != nobj - p->nlargeobj)
 581 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_PACKIDX);
 582 f9c2e8e5 2022-02-13 thomas 
 583 f9c2e8e5 2022-02-13 thomas 	qsort(p->sorted_offsets, nobj - p->nlargeobj,
 584 f9c2e8e5 2022-02-13 thomas 	    sizeof(p->sorted_offsets[0]), offset_cmp);
 585 f9c2e8e5 2022-02-13 thomas 
 586 f9c2e8e5 2022-02-13 thomas 	if (p->sorted_large_offsets)
 587 f9c2e8e5 2022-02-13 thomas 		qsort(p->sorted_large_offsets, p->nlargeobj,
 588 f9c2e8e5 2022-02-13 thomas 		    sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
 589 f9c2e8e5 2022-02-13 thomas 
 590 f9c2e8e5 2022-02-13 thomas 	return NULL;
 591 f9c2e8e5 2022-02-13 thomas }
 592 f9c2e8e5 2022-02-13 thomas 
 593 876c234b 2018-09-10 stsp const struct got_error *
 594 f9c2e8e5 2022-02-13 thomas got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
 595 f9c2e8e5 2022-02-13 thomas {
 596 f9c2e8e5 2022-02-13 thomas 	const struct got_error *err;
 597 f9c2e8e5 2022-02-13 thomas 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 598 f9c2e8e5 2022-02-13 thomas 	int i, left, right;
 599 f9c2e8e5 2022-02-13 thomas 
 600 f9c2e8e5 2022-02-13 thomas 	*idx = -1;
 601 f9c2e8e5 2022-02-13 thomas 
 602 f9c2e8e5 2022-02-13 thomas 	if (packidx->sorted_offsets == NULL) {
 603 f9c2e8e5 2022-02-13 thomas 		err = build_offset_index(packidx);
 604 f9c2e8e5 2022-02-13 thomas 		if (err)
 605 f9c2e8e5 2022-02-13 thomas 			return err;
 606 f9c2e8e5 2022-02-13 thomas 	}
 607 f9c2e8e5 2022-02-13 thomas 
 608 f9c2e8e5 2022-02-13 thomas 	if (offset >= 0x7fffffff) {
 609 f9c2e8e5 2022-02-13 thomas 		uint64_t lo;
 610 f9c2e8e5 2022-02-13 thomas 		left = 0, right = packidx->nlargeobj - 1;
 611 f9c2e8e5 2022-02-13 thomas 		while (left <= right) {
 612 f9c2e8e5 2022-02-13 thomas 			i = ((left + right) / 2);
 613 f9c2e8e5 2022-02-13 thomas 			lo = packidx->sorted_large_offsets[i].offset;
 614 f9c2e8e5 2022-02-13 thomas 			if (lo == offset) {
 615 f9c2e8e5 2022-02-13 thomas 				*idx = packidx->sorted_large_offsets[i].idx;
 616 f9c2e8e5 2022-02-13 thomas 				break;
 617 f9c2e8e5 2022-02-13 thomas 			} else if (offset > lo)
 618 f9c2e8e5 2022-02-13 thomas 				left = i + 1;
 619 f9c2e8e5 2022-02-13 thomas 			else if (offset < lo)
 620 f9c2e8e5 2022-02-13 thomas 				right = i - 1;
 621 f9c2e8e5 2022-02-13 thomas 		}
 622 f9c2e8e5 2022-02-13 thomas 	} else {
 623 f9c2e8e5 2022-02-13 thomas 		uint32_t o;
 624 f9c2e8e5 2022-02-13 thomas 		left = 0, right = totobj - packidx->nlargeobj - 1;
 625 f9c2e8e5 2022-02-13 thomas 		while (left <= right) {
 626 f9c2e8e5 2022-02-13 thomas 			i = ((left + right) / 2);
 627 f9c2e8e5 2022-02-13 thomas 			o = packidx->sorted_offsets[i].offset;
 628 f9c2e8e5 2022-02-13 thomas 			if (o == offset) {
 629 f9c2e8e5 2022-02-13 thomas 				*idx = packidx->sorted_offsets[i].idx;
 630 f9c2e8e5 2022-02-13 thomas 				break;
 631 f9c2e8e5 2022-02-13 thomas 			} else if (offset > o)
 632 f9c2e8e5 2022-02-13 thomas 				left = i + 1;
 633 f9c2e8e5 2022-02-13 thomas 			else if (offset < o)
 634 f9c2e8e5 2022-02-13 thomas 				right = i - 1;
 635 f9c2e8e5 2022-02-13 thomas 		}
 636 f9c2e8e5 2022-02-13 thomas 	}
 637 f9c2e8e5 2022-02-13 thomas 
 638 f9c2e8e5 2022-02-13 thomas 	return NULL;
 639 f9c2e8e5 2022-02-13 thomas }
 640 f9c2e8e5 2022-02-13 thomas 
 641 f9c2e8e5 2022-02-13 thomas const struct got_error *
 642 f9c2e8e5 2022-02-13 thomas got_packidx_get_object_id(struct got_object_id *id,
 643 f9c2e8e5 2022-02-13 thomas     struct got_packidx *packidx, int idx)
 644 f9c2e8e5 2022-02-13 thomas {
 645 f9c2e8e5 2022-02-13 thomas 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 646 f9c2e8e5 2022-02-13 thomas 	struct got_packidx_object_id *oid;
 647 f9c2e8e5 2022-02-13 thomas 
 648 f9c2e8e5 2022-02-13 thomas 	if (idx < 0 || idx >= totobj)
 649 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_NO_OBJ);
 650 f9c2e8e5 2022-02-13 thomas 
 651 f9c2e8e5 2022-02-13 thomas 	oid = &packidx->hdr.sorted_ids[idx];
 652 f9c2e8e5 2022-02-13 thomas 	memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 653 f9c2e8e5 2022-02-13 thomas 	return NULL;
 654 f9c2e8e5 2022-02-13 thomas }
 655 f9c2e8e5 2022-02-13 thomas 
 656 f9c2e8e5 2022-02-13 thomas const struct got_error *
 657 dd88155e 2019-06-29 stsp got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
 658 4277420a 2019-06-29 stsp     struct got_packidx *packidx, const char *id_str_prefix)
 659 e09a504c 2019-06-28 stsp {
 660 dd88155e 2019-06-29 stsp 	const struct got_error *err = NULL;
 661 4277420a 2019-06-29 stsp 	u_int8_t id0;
 662 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 663 4277420a 2019-06-29 stsp 	char hex[3];
 664 4277420a 2019-06-29 stsp 	size_t prefix_len = strlen(id_str_prefix);
 665 e09a504c 2019-06-28 stsp 	struct got_packidx_object_id *oid;
 666 ec138a87 2022-01-03 thomas 	uint32_t i = 0;
 667 e09a504c 2019-06-28 stsp 
 668 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(matched_ids);
 669 4277420a 2019-06-29 stsp 
 670 4277420a 2019-06-29 stsp 	if (prefix_len < 2)
 671 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 672 4277420a 2019-06-29 stsp 
 673 4277420a 2019-06-29 stsp 	hex[0] = id_str_prefix[0];
 674 4277420a 2019-06-29 stsp 	hex[1] = id_str_prefix[1];
 675 4277420a 2019-06-29 stsp 	hex[2] = '\0';
 676 4277420a 2019-06-29 stsp 	if (!got_parse_xdigit(&id0, hex))
 677 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 678 4277420a 2019-06-29 stsp 
 679 ec138a87 2022-01-03 thomas 	if (id0 > 0)
 680 ec138a87 2022-01-03 thomas 		i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 681 4277420a 2019-06-29 stsp 	oid = &packidx->hdr.sorted_ids[i];
 682 4277420a 2019-06-29 stsp 	while (i < totobj && oid->sha1[0] == id0) {
 683 4277420a 2019-06-29 stsp 		char id_str[SHA1_DIGEST_STRING_LENGTH];
 684 dd88155e 2019-06-29 stsp 		struct got_object_qid *qid;
 685 4277420a 2019-06-29 stsp 		int cmp;
 686 4277420a 2019-06-29 stsp 
 687 4277420a 2019-06-29 stsp 		if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
 688 4277420a 2019-06-29 stsp 		        return got_error(GOT_ERR_NO_SPACE);
 689 4277420a 2019-06-29 stsp 
 690 4277420a 2019-06-29 stsp 		cmp = strncmp(id_str, id_str_prefix, prefix_len);
 691 4277420a 2019-06-29 stsp 		if (cmp < 0) {
 692 4277420a 2019-06-29 stsp 			oid = &packidx->hdr.sorted_ids[++i];
 693 4277420a 2019-06-29 stsp 			continue;
 694 4277420a 2019-06-29 stsp 		} else if (cmp > 0)
 695 e09a504c 2019-06-28 stsp 			break;
 696 4277420a 2019-06-29 stsp 
 697 dd88155e 2019-06-29 stsp 		err = got_object_qid_alloc_partial(&qid);
 698 dd88155e 2019-06-29 stsp 		if (err)
 699 dd88155e 2019-06-29 stsp 			break;
 700 ec242592 2022-04-22 thomas 		memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 701 dbdddfee 2021-06-23 naddy 		STAILQ_INSERT_TAIL(matched_ids, qid, entry);
 702 4277420a 2019-06-29 stsp 
 703 4277420a 2019-06-29 stsp 		oid = &packidx->hdr.sorted_ids[++i];
 704 e09a504c 2019-06-28 stsp 	}
 705 e09a504c 2019-06-28 stsp 
 706 0adc7bcc 2019-06-29 stsp 	if (err)
 707 0adc7bcc 2019-06-29 stsp 		got_object_id_queue_free(matched_ids);
 708 dd88155e 2019-06-29 stsp 	return err;
 709 e09a504c 2019-06-28 stsp }
 710 e09a504c 2019-06-28 stsp 
 711 b4f37570 2021-06-19 stsp static const struct got_error *
 712 b4f37570 2021-06-19 stsp pack_stop_privsep_child(struct got_pack *pack)
 713 876c234b 2018-09-10 stsp {
 714 96732e0b 2018-11-11 stsp 	const struct got_error *err = NULL;
 715 876c234b 2018-09-10 stsp 
 716 876c234b 2018-09-10 stsp 	if (pack->privsep_child == NULL)
 717 876c234b 2018-09-10 stsp 		return NULL;
 718 876c234b 2018-09-10 stsp 
 719 876c234b 2018-09-10 stsp 	err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 720 96732e0b 2018-11-11 stsp 	if (err)
 721 96732e0b 2018-11-11 stsp 		return err;
 722 96732e0b 2018-11-11 stsp 	err = got_privsep_wait_for_child(pack->privsep_child->pid);
 723 08578a35 2021-01-22 stsp 	if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
 724 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 725 cc2a8ef4 2021-06-19 tracey 	free(pack->privsep_child->ibuf);
 726 876c234b 2018-09-10 stsp 	free(pack->privsep_child);
 727 876c234b 2018-09-10 stsp 	pack->privsep_child = NULL;
 728 876c234b 2018-09-10 stsp 	return err;
 729 7e656b93 2018-03-17 stsp }
 730 7e656b93 2018-03-17 stsp 
 731 d7464085 2018-07-09 stsp const struct got_error *
 732 7e656b93 2018-03-17 stsp got_pack_close(struct got_pack *pack)
 733 7e656b93 2018-03-17 stsp {
 734 d7464085 2018-07-09 stsp 	const struct got_error *err = NULL;
 735 d7464085 2018-07-09 stsp 
 736 b4f37570 2021-06-19 stsp 	err = pack_stop_privsep_child(pack);
 737 876c234b 2018-09-10 stsp 	if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
 738 638f9024 2019-05-13 stsp 		err = got_error_from_errno("munmap");
 739 08578a35 2021-01-22 stsp 	if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
 740 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 741 8b2180d4 2018-04-26 stsp 	pack->fd = -1;
 742 4589e373 2018-03-17 stsp 	free(pack->path_packfile);
 743 4589e373 2018-03-17 stsp 	pack->path_packfile = NULL;
 744 4589e373 2018-03-17 stsp 	pack->filesize = 0;
 745 ab2f42e7 2019-11-10 stsp 	if (pack->delta_cache) {
 746 ab2f42e7 2019-11-10 stsp 		got_delta_cache_free(pack->delta_cache);
 747 ab2f42e7 2019-11-10 stsp 		pack->delta_cache = NULL;
 748 ab2f42e7 2019-11-10 stsp 	}
 749 7e656b93 2018-03-17 stsp 
 750 c7fe698a 2018-01-23 stsp 	return err;
 751 c7fe698a 2018-01-23 stsp }
 752 c7fe698a 2018-01-23 stsp 
 753 668a20f6 2020-03-18 stsp const struct got_error *
 754 668a20f6 2020-03-18 stsp got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
 755 d7464085 2018-07-09 stsp     struct got_pack *pack, off_t offset)
 756 a487c1d0 2018-01-14 stsp {
 757 a487c1d0 2018-01-14 stsp 	uint8_t t = 0;
 758 a487c1d0 2018-01-14 stsp 	uint64_t s = 0;
 759 a487c1d0 2018-01-14 stsp 	uint8_t sizeN;
 760 d7464085 2018-07-09 stsp 	size_t mapoff = 0;
 761 a487c1d0 2018-01-14 stsp 	int i = 0;
 762 d7464085 2018-07-09 stsp 
 763 d7464085 2018-07-09 stsp 	*len = 0;
 764 d7464085 2018-07-09 stsp 
 765 d7464085 2018-07-09 stsp 	if (offset >= pack->filesize)
 766 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 767 d7464085 2018-07-09 stsp 
 768 d7464085 2018-07-09 stsp 	if (pack->map) {
 769 d7464085 2018-07-09 stsp 		mapoff = (size_t)offset;
 770 d7464085 2018-07-09 stsp 	} else {
 771 d7464085 2018-07-09 stsp 		if (lseek(pack->fd, offset, SEEK_SET) == -1)
 772 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
 773 d7464085 2018-07-09 stsp 	}
 774 a487c1d0 2018-01-14 stsp 
 775 a1fd68d8 2018-01-12 stsp 	do {
 776 a1fd68d8 2018-01-12 stsp 		/* We do not support size values which don't fit in 64 bit. */
 777 a487c1d0 2018-01-14 stsp 		if (i > 9)
 778 a487c1d0 2018-01-14 stsp 			return got_error(GOT_ERR_NO_SPACE);
 779 a1fd68d8 2018-01-12 stsp 
 780 d7464085 2018-07-09 stsp 		if (pack->map) {
 781 1944573a 2022-01-10 thomas 			if (mapoff + sizeof(sizeN) >= pack->filesize)
 782 1944573a 2022-01-10 thomas 				return got_error(GOT_ERR_BAD_PACKFILE);
 783 d7464085 2018-07-09 stsp 			sizeN = *(pack->map + mapoff);
 784 d7464085 2018-07-09 stsp 			mapoff += sizeof(sizeN);
 785 d7464085 2018-07-09 stsp 		} else {
 786 d7464085 2018-07-09 stsp 			ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
 787 d7464085 2018-07-09 stsp 			if (n < 0)
 788 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 789 d7464085 2018-07-09 stsp 			if (n != sizeof(sizeN))
 790 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 791 d7464085 2018-07-09 stsp 		}
 792 d7464085 2018-07-09 stsp 		*len += sizeof(sizeN);
 793 8251fdbc 2018-01-12 stsp 
 794 a1fd68d8 2018-01-12 stsp 		if (i == 0) {
 795 a487c1d0 2018-01-14 stsp 			t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
 796 a1fd68d8 2018-01-12 stsp 			    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
 797 a487c1d0 2018-01-14 stsp 			s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
 798 a1fd68d8 2018-01-12 stsp 		} else {
 799 a1fd68d8 2018-01-12 stsp 			size_t shift = 4 + 7 * (i - 1);
 800 a487c1d0 2018-01-14 stsp 			s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
 801 a1fd68d8 2018-01-12 stsp 		}
 802 a1fd68d8 2018-01-12 stsp 		i++;
 803 a1fd68d8 2018-01-12 stsp 	} while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
 804 a1fd68d8 2018-01-12 stsp 
 805 a487c1d0 2018-01-14 stsp 	*type = t;
 806 a487c1d0 2018-01-14 stsp 	*size = s;
 807 a487c1d0 2018-01-14 stsp 	return NULL;
 808 0a0a3048 2018-01-10 stsp }
 809 c54542a0 2018-01-13 stsp 
 810 a1fd68d8 2018-01-12 stsp static const struct got_error *
 811 5f25cc85 2019-11-26 stsp open_plain_object(struct got_object **obj, struct got_object_id *id,
 812 5f25cc85 2019-11-26 stsp     uint8_t type, off_t offset, size_t size, int idx)
 813 6ccb713b 2018-01-19 stsp {
 814 6ccb713b 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
 815 6ccb713b 2018-01-19 stsp 	if (*obj == NULL)
 816 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 817 6ccb713b 2018-01-19 stsp 
 818 6ccb713b 2018-01-19 stsp 	(*obj)->type = type;
 819 6ccb713b 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
 820 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
 821 6ccb713b 2018-01-19 stsp 	(*obj)->hdrlen = 0;
 822 6ccb713b 2018-01-19 stsp 	(*obj)->size = size;
 823 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
 824 6ccb713b 2018-01-19 stsp 	(*obj)->pack_offset = offset;
 825 b107e67f 2018-01-19 stsp 
 826 b107e67f 2018-01-19 stsp 	return NULL;
 827 b107e67f 2018-01-19 stsp }
 828 b107e67f 2018-01-19 stsp 
 829 b107e67f 2018-01-19 stsp static const struct got_error *
 830 d7464085 2018-07-09 stsp parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
 831 d7464085 2018-07-09 stsp     off_t delta_offset)
 832 b107e67f 2018-01-19 stsp {
 833 b107e67f 2018-01-19 stsp 	int64_t o = 0;
 834 b107e67f 2018-01-19 stsp 	uint8_t offN;
 835 b107e67f 2018-01-19 stsp 	int i = 0;
 836 b107e67f 2018-01-19 stsp 
 837 a0de39f3 2019-08-09 stsp 	*offset = 0;
 838 d7464085 2018-07-09 stsp 	*len = 0;
 839 d7464085 2018-07-09 stsp 
 840 b107e67f 2018-01-19 stsp 	do {
 841 b107e67f 2018-01-19 stsp 		/* We do not support offset values which don't fit in 64 bit. */
 842 b107e67f 2018-01-19 stsp 		if (i > 8)
 843 b107e67f 2018-01-19 stsp 			return got_error(GOT_ERR_NO_SPACE);
 844 b107e67f 2018-01-19 stsp 
 845 d7464085 2018-07-09 stsp 		if (pack->map) {
 846 d7464085 2018-07-09 stsp 			size_t mapoff;
 847 d7464085 2018-07-09 stsp 			mapoff = (size_t)delta_offset + *len;
 848 1944573a 2022-01-10 thomas 			if (mapoff + sizeof(offN) >= pack->filesize)
 849 1944573a 2022-01-10 thomas 				return got_error(GOT_ERR_PACK_OFFSET);
 850 d7464085 2018-07-09 stsp 			offN = *(pack->map + mapoff);
 851 d7464085 2018-07-09 stsp 		} else {
 852 d7464085 2018-07-09 stsp 			ssize_t n;
 853 d7464085 2018-07-09 stsp 			n = read(pack->fd, &offN, sizeof(offN));
 854 d7464085 2018-07-09 stsp 			if (n < 0)
 855 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 856 d7464085 2018-07-09 stsp 			if (n != sizeof(offN))
 857 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 858 d7464085 2018-07-09 stsp 		}
 859 d7464085 2018-07-09 stsp 		*len += sizeof(offN);
 860 b107e67f 2018-01-19 stsp 
 861 b107e67f 2018-01-19 stsp 		if (i == 0)
 862 b107e67f 2018-01-19 stsp 			o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 863 b107e67f 2018-01-19 stsp 		else {
 864 cecc778e 2018-01-23 stsp 			o++;
 865 b107e67f 2018-01-19 stsp 			o <<= 7;
 866 cecc778e 2018-01-23 stsp 			o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 867 b107e67f 2018-01-19 stsp 		}
 868 b107e67f 2018-01-19 stsp 		i++;
 869 b107e67f 2018-01-19 stsp 	} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
 870 6ccb713b 2018-01-19 stsp 
 871 b107e67f 2018-01-19 stsp 	*offset = o;
 872 6ccb713b 2018-01-19 stsp 	return NULL;
 873 6ccb713b 2018-01-19 stsp }
 874 6ccb713b 2018-01-19 stsp 
 875 668a20f6 2020-03-18 stsp const struct got_error *
 876 48b4f239 2021-12-31 thomas got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
 877 48b4f239 2021-12-31 thomas     struct got_pack *pack, off_t offset, int tslen)
 878 b107e67f 2018-01-19 stsp {
 879 96f5e8b3 2018-01-23 stsp 	const struct got_error *err;
 880 b107e67f 2018-01-19 stsp 	int64_t negoffset;
 881 b107e67f 2018-01-19 stsp 	size_t negofflen;
 882 b107e67f 2018-01-19 stsp 
 883 d7464085 2018-07-09 stsp 	*len = 0;
 884 d7464085 2018-07-09 stsp 
 885 d7464085 2018-07-09 stsp 	err = parse_negative_offset(&negoffset, &negofflen, pack,
 886 d7464085 2018-07-09 stsp 	    offset + tslen);
 887 b107e67f 2018-01-19 stsp 	if (err)
 888 b107e67f 2018-01-19 stsp 		return err;
 889 b107e67f 2018-01-19 stsp 
 890 b107e67f 2018-01-19 stsp 	/* Compute the base object's offset (must be in the same pack file). */
 891 96f5e8b3 2018-01-23 stsp 	*base_offset = (offset - negoffset);
 892 96f5e8b3 2018-01-23 stsp 	if (*base_offset <= 0)
 893 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_BAD_PACKFILE);
 894 b107e67f 2018-01-19 stsp 
 895 d7464085 2018-07-09 stsp 	*len = negofflen;
 896 96f5e8b3 2018-01-23 stsp 	return NULL;
 897 96f5e8b3 2018-01-23 stsp }
 898 96f5e8b3 2018-01-23 stsp 
 899 0e22967e 2018-02-11 stsp static const struct got_error *
 900 42c69117 2019-11-10 stsp read_delta_data(uint8_t **delta_buf, size_t *delta_len,
 901 9249e7e3 2022-05-12 thomas     size_t *delta_compressed_len, size_t delta_data_offset,
 902 9249e7e3 2022-05-12 thomas     struct got_pack *pack)
 903 42c69117 2019-11-10 stsp {
 904 42c69117 2019-11-10 stsp 	const struct got_error *err = NULL;
 905 9249e7e3 2022-05-12 thomas 	size_t consumed = 0;
 906 42c69117 2019-11-10 stsp 
 907 42c69117 2019-11-10 stsp 	if (pack->map) {
 908 42c69117 2019-11-10 stsp 		if (delta_data_offset >= pack->filesize)
 909 42c69117 2019-11-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
 910 2e5a6fad 2020-03-18 stsp 		err = got_inflate_to_mem_mmap(delta_buf, delta_len,
 911 9249e7e3 2022-05-12 thomas 		    &consumed, NULL, pack->map, delta_data_offset,
 912 2e5a6fad 2020-03-18 stsp 		    pack->filesize - delta_data_offset);
 913 9249e7e3 2022-05-12 thomas 		if (err)
 914 9249e7e3 2022-05-12 thomas 			return err;
 915 42c69117 2019-11-10 stsp 	} else {
 916 42c69117 2019-11-10 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
 917 42c69117 2019-11-10 stsp 			return got_error_from_errno("lseek");
 918 9249e7e3 2022-05-12 thomas 		err = got_inflate_to_mem_fd(delta_buf, delta_len,
 919 9249e7e3 2022-05-12 thomas 		    &consumed, NULL, 0, pack->fd);
 920 9249e7e3 2022-05-12 thomas 		if (err)
 921 9249e7e3 2022-05-12 thomas 			return err;
 922 42c69117 2019-11-10 stsp 	}
 923 9249e7e3 2022-05-12 thomas 
 924 9249e7e3 2022-05-12 thomas 	if (delta_compressed_len)
 925 9249e7e3 2022-05-12 thomas 		*delta_compressed_len = consumed;
 926 9249e7e3 2022-05-12 thomas 
 927 9249e7e3 2022-05-12 thomas 	return NULL;
 928 42c69117 2019-11-10 stsp }
 929 a3500804 2018-01-23 stsp 
 930 96f5e8b3 2018-01-23 stsp static const struct got_error *
 931 c336f889 2018-07-23 stsp add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
 932 42c69117 2019-11-10 stsp     int delta_type, size_t delta_size, size_t delta_data_offset)
 933 bdd2fbb3 2018-02-11 stsp {
 934 bdd2fbb3 2018-02-11 stsp 	struct got_delta *delta;
 935 bdd2fbb3 2018-02-11 stsp 
 936 c336f889 2018-07-23 stsp 	delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
 937 42c69117 2019-11-10 stsp 	    delta_data_offset);
 938 bdd2fbb3 2018-02-11 stsp 	if (delta == NULL)
 939 638f9024 2019-05-13 stsp 		return got_error_from_errno("got_delta_open");
 940 bdd2fbb3 2018-02-11 stsp 	/* delta is freed in got_object_close() */
 941 bdd2fbb3 2018-02-11 stsp 	deltas->nentries++;
 942 dbdddfee 2021-06-23 naddy 	STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
 943 bdd2fbb3 2018-02-11 stsp 	return NULL;
 944 bdd2fbb3 2018-02-11 stsp }
 945 bdd2fbb3 2018-02-11 stsp 
 946 bdd2fbb3 2018-02-11 stsp static const struct got_error *
 947 6b9c9673 2018-01-23 stsp resolve_offset_delta(struct got_delta_chain *deltas,
 948 c8ecd499 2018-09-09 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
 949 c8ecd499 2018-09-09 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
 950 bdd2fbb3 2018-02-11 stsp 
 951 a3500804 2018-01-23 stsp {
 952 a3500804 2018-01-23 stsp 	const struct got_error *err;
 953 c3703302 2018-01-23 stsp 	off_t base_offset;
 954 c3703302 2018-01-23 stsp 	uint8_t base_type;
 955 c3703302 2018-01-23 stsp 	uint64_t base_size;
 956 c3703302 2018-01-23 stsp 	size_t base_tslen;
 957 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
 958 42c69117 2019-11-10 stsp 	size_t consumed;
 959 a3500804 2018-01-23 stsp 
 960 668a20f6 2020-03-18 stsp 	err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
 961 d7464085 2018-07-09 stsp 	    delta_offset, tslen);
 962 a3500804 2018-01-23 stsp 	if (err)
 963 a3500804 2018-01-23 stsp 		return err;
 964 a3500804 2018-01-23 stsp 
 965 d7464085 2018-07-09 stsp 	delta_data_offset = delta_offset + tslen + consumed;
 966 d7464085 2018-07-09 stsp 	if (delta_data_offset >= pack->filesize)
 967 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 968 a53d2f13 2018-03-17 stsp 
 969 d7464085 2018-07-09 stsp 	if (pack->map == NULL) {
 970 d7464085 2018-07-09 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
 971 d7464085 2018-07-09 stsp 		if (delta_data_offset == -1)
 972 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
 973 d7464085 2018-07-09 stsp 	}
 974 bdd2fbb3 2018-02-11 stsp 
 975 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
 976 42c69117 2019-11-10 stsp 	    delta_data_offset);
 977 bdd2fbb3 2018-02-11 stsp 	if (err)
 978 1a35c1bc 2019-05-22 stsp 		return err;
 979 bdd2fbb3 2018-02-11 stsp 
 980 c3703302 2018-01-23 stsp 	/* An offset delta must be in the same packfile. */
 981 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
 982 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 983 b107e67f 2018-01-19 stsp 
 984 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
 985 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
 986 b107e67f 2018-01-19 stsp 	if (err)
 987 1a35c1bc 2019-05-22 stsp 		return err;
 988 b107e67f 2018-01-19 stsp 
 989 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
 990 b0e2201a 2018-06-22 stsp 	    base_tslen, base_type, base_size, recursion - 1);
 991 c3703302 2018-01-23 stsp }
 992 c4330eff 2021-06-22 stsp 
 993 c4330eff 2021-06-22 stsp const struct got_error *
 994 c4330eff 2021-06-22 stsp got_pack_parse_ref_delta(struct got_object_id *id,
 995 c4330eff 2021-06-22 stsp     struct got_pack *pack, off_t delta_offset, int tslen)
 996 c4330eff 2021-06-22 stsp {
 997 c4330eff 2021-06-22 stsp 	if (pack->map) {
 998 c4330eff 2021-06-22 stsp 		size_t mapoff = delta_offset + tslen;
 999 1944573a 2022-01-10 thomas 		if (mapoff + sizeof(*id) >= pack->filesize)
1000 1944573a 2022-01-10 thomas 			return got_error(GOT_ERR_PACK_OFFSET);
1001 c4330eff 2021-06-22 stsp 		memcpy(id, pack->map + mapoff, sizeof(*id));
1002 c4330eff 2021-06-22 stsp 	} else {
1003 c4330eff 2021-06-22 stsp 		ssize_t n;
1004 c4330eff 2021-06-22 stsp 		n = read(pack->fd, id, sizeof(*id));
1005 c4330eff 2021-06-22 stsp 		if (n < 0)
1006 c4330eff 2021-06-22 stsp 			return got_error_from_errno("read");
1007 c4330eff 2021-06-22 stsp 		if (n != sizeof(*id))
1008 c4330eff 2021-06-22 stsp 			return got_error(GOT_ERR_BAD_PACKFILE);
1009 c4330eff 2021-06-22 stsp 	}
1010 c3703302 2018-01-23 stsp 
1011 c4330eff 2021-06-22 stsp 	return NULL;
1012 c4330eff 2021-06-22 stsp }
1013 c4330eff 2021-06-22 stsp 
1014 c3703302 2018-01-23 stsp static const struct got_error *
1015 c8ecd499 2018-09-09 stsp resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1016 c8ecd499 2018-09-09 stsp     struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1017 c8ecd499 2018-09-09 stsp     size_t delta_size, unsigned int recursion)
1018 c3703302 2018-01-23 stsp {
1019 6b9c9673 2018-01-23 stsp 	const struct got_error *err;
1020 6b9c9673 2018-01-23 stsp 	struct got_object_id id;
1021 6b9c9673 2018-01-23 stsp 	int idx;
1022 6b9c9673 2018-01-23 stsp 	off_t base_offset;
1023 6b9c9673 2018-01-23 stsp 	uint8_t base_type;
1024 6b9c9673 2018-01-23 stsp 	uint64_t base_size;
1025 6b9c9673 2018-01-23 stsp 	size_t base_tslen;
1026 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1027 6b9c9673 2018-01-23 stsp 
1028 42c69117 2019-11-10 stsp 	if (delta_offset + tslen >= pack->filesize)
1029 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1030 a53d2f13 2018-03-17 stsp 
1031 c4330eff 2021-06-22 stsp 	err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1032 c4330eff 2021-06-22 stsp 	if (err)
1033 c4330eff 2021-06-22 stsp 		return err;
1034 d7464085 2018-07-09 stsp 	if (pack->map) {
1035 c4330eff 2021-06-22 stsp 		delta_data_offset = delta_offset + tslen + sizeof(id);
1036 d7464085 2018-07-09 stsp 	} else {
1037 e40b19ed 2020-01-06 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1038 e40b19ed 2020-01-06 stsp 		if (delta_data_offset == -1)
1039 e40b19ed 2020-01-06 stsp 			return got_error_from_errno("lseek");
1040 d7464085 2018-07-09 stsp 	}
1041 d7464085 2018-07-09 stsp 
1042 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1043 42c69117 2019-11-10 stsp 	    delta_data_offset);
1044 bdd2fbb3 2018-02-11 stsp 	if (err)
1045 1a35c1bc 2019-05-22 stsp 		return err;
1046 bdd2fbb3 2018-02-11 stsp 
1047 652b2703 2018-06-22 stsp 	/* Delta base must be in the same pack file. */
1048 1510f469 2018-09-09 stsp 	idx = got_packidx_get_object_idx(packidx, &id);
1049 1a35c1bc 2019-05-22 stsp 	if (idx == -1)
1050 668a20f6 2020-03-18 stsp 		return got_error(GOT_ERR_NO_OBJ);
1051 6b9c9673 2018-01-23 stsp 
1052 02828bfd 2021-06-22 stsp 	base_offset = got_packidx_get_object_offset(packidx, idx);
1053 1a35c1bc 2019-05-22 stsp 	if (base_offset == (uint64_t)-1)
1054 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1055 6b9c9673 2018-01-23 stsp 
1056 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1057 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1058 6b9c9673 2018-01-23 stsp 
1059 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1060 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1061 6b9c9673 2018-01-23 stsp 	if (err)
1062 1a35c1bc 2019-05-22 stsp 		return err;
1063 6b9c9673 2018-01-23 stsp 
1064 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1065 0c048b15 2018-04-27 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1066 6b9c9673 2018-01-23 stsp }
1067 6b9c9673 2018-01-23 stsp 
1068 668a20f6 2020-03-18 stsp const struct got_error *
1069 668a20f6 2020-03-18 stsp got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1070 668a20f6 2020-03-18 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1071 668a20f6 2020-03-18 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1072 6b9c9673 2018-01-23 stsp {
1073 c3703302 2018-01-23 stsp 	const struct got_error *err = NULL;
1074 c3703302 2018-01-23 stsp 
1075 5b7e13a7 2018-04-02 stsp 	if (--recursion == 0)
1076 5b7e13a7 2018-04-02 stsp 		return got_error(GOT_ERR_RECURSION);
1077 5b7e13a7 2018-04-02 stsp 
1078 c3703302 2018-01-23 stsp 	switch (delta_type) {
1079 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_COMMIT:
1080 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TREE:
1081 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_BLOB:
1082 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TAG:
1083 c3703302 2018-01-23 stsp 		/* Plain types are the final delta base. Recursion ends. */
1084 c336f889 2018-07-23 stsp 		err = add_delta(deltas, delta_offset, tslen, delta_type,
1085 42c69117 2019-11-10 stsp 		    delta_size, 0);
1086 4e8cda55 2018-01-19 stsp 		break;
1087 a3500804 2018-01-23 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1088 c8ecd499 2018-09-09 stsp 		err = resolve_offset_delta(deltas, packidx, pack,
1089 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1090 96f5e8b3 2018-01-23 stsp 		break;
1091 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1092 c8ecd499 2018-09-09 stsp 		err = resolve_ref_delta(deltas, packidx, pack,
1093 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1094 6b9c9673 2018-01-23 stsp 		break;
1095 4e8cda55 2018-01-19 stsp 	default:
1096 4810de4a 2018-04-01 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1097 4e8cda55 2018-01-19 stsp 	}
1098 96f5e8b3 2018-01-23 stsp 
1099 96f5e8b3 2018-01-23 stsp 	return err;
1100 96f5e8b3 2018-01-23 stsp }
1101 96f5e8b3 2018-01-23 stsp 
1102 96f5e8b3 2018-01-23 stsp static const struct got_error *
1103 a98c62b1 2018-09-09 stsp open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1104 a98c62b1 2018-09-09 stsp     struct got_pack *pack, struct got_object_id *id, off_t offset,
1105 c59b3346 2018-09-11 stsp     size_t tslen, int delta_type, size_t delta_size, int idx)
1106 96f5e8b3 2018-01-23 stsp {
1107 96f5e8b3 2018-01-23 stsp 	const struct got_error *err = NULL;
1108 96f5e8b3 2018-01-23 stsp 	int resolved_type;
1109 4e8cda55 2018-01-19 stsp 
1110 b107e67f 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
1111 b107e67f 2018-01-19 stsp 	if (*obj == NULL)
1112 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
1113 b107e67f 2018-01-19 stsp 
1114 96f5e8b3 2018-01-23 stsp 	(*obj)->flags = 0;
1115 b107e67f 2018-01-19 stsp 	(*obj)->hdrlen = 0;
1116 39e73dc9 2018-03-03 stsp 	(*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1117 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1118 cecc778e 2018-01-23 stsp 	(*obj)->pack_offset = offset + tslen;
1119 1a35c1bc 2019-05-22 stsp 
1120 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(&(*obj)->deltas.entries);
1121 1a35c1bc 2019-05-22 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1122 96f5e8b3 2018-01-23 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1123 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
1124 96f5e8b3 2018-01-23 stsp 
1125 668a20f6 2020-03-18 stsp 	err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1126 668a20f6 2020-03-18 stsp 	    offset, tslen, delta_type, delta_size,
1127 668a20f6 2020-03-18 stsp 	    GOT_DELTA_CHAIN_RECURSION_MAX);
1128 96f5e8b3 2018-01-23 stsp 	if (err)
1129 96f5e8b3 2018-01-23 stsp 		goto done;
1130 96f5e8b3 2018-01-23 stsp 
1131 96f5e8b3 2018-01-23 stsp 	err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1132 96f5e8b3 2018-01-23 stsp 	if (err)
1133 96f5e8b3 2018-01-23 stsp 		goto done;
1134 96f5e8b3 2018-01-23 stsp 	(*obj)->type = resolved_type;
1135 96f5e8b3 2018-01-23 stsp done:
1136 96f5e8b3 2018-01-23 stsp 	if (err) {
1137 96f5e8b3 2018-01-23 stsp 		got_object_close(*obj);
1138 96f5e8b3 2018-01-23 stsp 		*obj = NULL;
1139 96f5e8b3 2018-01-23 stsp 	}
1140 96f5e8b3 2018-01-23 stsp 	return err;
1141 b107e67f 2018-01-19 stsp }
1142 b107e67f 2018-01-19 stsp 
1143 2090a03d 2018-09-09 stsp const struct got_error *
1144 2090a03d 2018-09-09 stsp got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1145 6fd11751 2018-06-04 stsp     struct got_packidx *packidx, int idx, struct got_object_id *id)
1146 a1fd68d8 2018-01-12 stsp {
1147 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
1148 a1fd68d8 2018-01-12 stsp 	off_t offset;
1149 6c00b545 2018-01-17 stsp 	uint8_t type;
1150 6c00b545 2018-01-17 stsp 	uint64_t size;
1151 3ee5fc21 2018-01-17 stsp 	size_t tslen;
1152 a1fd68d8 2018-01-12 stsp 
1153 6c00b545 2018-01-17 stsp 	*obj = NULL;
1154 a1fd68d8 2018-01-12 stsp 
1155 02828bfd 2021-06-22 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1156 a1fd68d8 2018-01-12 stsp 	if (offset == (uint64_t)-1)
1157 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1158 a1fd68d8 2018-01-12 stsp 
1159 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1160 668a20f6 2020-03-18 stsp 	    pack, offset);
1161 a1fd68d8 2018-01-12 stsp 	if (err)
1162 35c73765 2018-09-09 stsp 		return err;
1163 a1fd68d8 2018-01-12 stsp 
1164 6c00b545 2018-01-17 stsp 	switch (type) {
1165 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
1166 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
1167 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
1168 d33fc9ef 2018-01-23 stsp 	case GOT_OBJ_TYPE_TAG:
1169 5f25cc85 2019-11-26 stsp 		err = open_plain_object(obj, id, type, offset + tslen,
1170 5f25cc85 2019-11-26 stsp 		    size, idx);
1171 6c00b545 2018-01-17 stsp 		break;
1172 b107e67f 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1173 a48db7e5 2018-01-23 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1174 a98c62b1 2018-09-09 stsp 		err = open_delta_object(obj, packidx, pack, id, offset,
1175 c59b3346 2018-09-11 stsp 		    tslen, type, size, idx);
1176 b107e67f 2018-01-19 stsp 		break;
1177 6c00b545 2018-01-17 stsp 	default:
1178 4810de4a 2018-04-01 stsp 		err = got_error(GOT_ERR_OBJ_TYPE);
1179 35c73765 2018-09-09 stsp 		break;
1180 35c73765 2018-09-09 stsp 	}
1181 35c73765 2018-09-09 stsp 
1182 3ee5fc21 2018-01-17 stsp 	return err;
1183 3ee5fc21 2018-01-17 stsp }
1184 efd2a263 2018-01-19 stsp 
1185 d582f26c 2020-03-18 stsp const struct got_error *
1186 48b4f239 2021-12-31 thomas got_pack_get_delta_chain_max_size(uint64_t *max_size,
1187 48b4f239 2021-12-31 thomas     struct got_delta_chain *deltas, struct got_pack *pack)
1188 22484865 2018-03-13 stsp {
1189 22484865 2018-03-13 stsp 	struct got_delta *delta;
1190 22484865 2018-03-13 stsp 	uint64_t base_size = 0, result_size = 0;
1191 22484865 2018-03-13 stsp 
1192 22484865 2018-03-13 stsp 	*max_size = 0;
1193 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1194 22484865 2018-03-13 stsp 		/* Plain object types are the delta base. */
1195 22484865 2018-03-13 stsp 		if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1196 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TREE &&
1197 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_BLOB &&
1198 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TAG) {
1199 22484865 2018-03-13 stsp 			const struct got_error *err;
1200 42c69117 2019-11-10 stsp 			uint8_t *delta_buf;
1201 42c69117 2019-11-10 stsp 			size_t delta_len;
1202 ab2f42e7 2019-11-10 stsp 			int cached = 1;
1203 42c69117 2019-11-10 stsp 
1204 ab2f42e7 2019-11-10 stsp 			got_delta_cache_get(&delta_buf, &delta_len,
1205 ab2f42e7 2019-11-10 stsp 			    pack->delta_cache, delta->data_offset);
1206 ab2f42e7 2019-11-10 stsp 			if (delta_buf == NULL) {
1207 ab2f42e7 2019-11-10 stsp 				cached = 0;
1208 ab2f42e7 2019-11-10 stsp 				err = read_delta_data(&delta_buf, &delta_len,
1209 9249e7e3 2022-05-12 thomas 				    NULL, delta->data_offset, pack);
1210 ab2f42e7 2019-11-10 stsp 				if (err)
1211 ab2f42e7 2019-11-10 stsp 					return err;
1212 ab2f42e7 2019-11-10 stsp 				err = got_delta_cache_add(pack->delta_cache,
1213 ab2f42e7 2019-11-10 stsp 				    delta->data_offset, delta_buf, delta_len);
1214 ab2f42e7 2019-11-10 stsp 				if (err == NULL)
1215 ab2f42e7 2019-11-10 stsp 					cached = 1;
1216 ab2f42e7 2019-11-10 stsp 				else if (err->code != GOT_ERR_NO_SPACE) {
1217 ab2f42e7 2019-11-10 stsp 					free(delta_buf);
1218 ab2f42e7 2019-11-10 stsp 					return err;
1219 ab2f42e7 2019-11-10 stsp 				}
1220 ab2f42e7 2019-11-10 stsp 			}
1221 a53d2f13 2018-03-17 stsp 			err = got_delta_get_sizes(&base_size, &result_size,
1222 42c69117 2019-11-10 stsp 			    delta_buf, delta_len);
1223 ab2f42e7 2019-11-10 stsp 			if (!cached)
1224 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1225 22484865 2018-03-13 stsp 			if (err)
1226 22484865 2018-03-13 stsp 				return err;
1227 22484865 2018-03-13 stsp 		} else
1228 22484865 2018-03-13 stsp 			base_size = delta->size;
1229 22484865 2018-03-13 stsp 		if (base_size > *max_size)
1230 22484865 2018-03-13 stsp 			*max_size = base_size;
1231 22484865 2018-03-13 stsp 		if (result_size > *max_size)
1232 22484865 2018-03-13 stsp 			*max_size = result_size;
1233 22484865 2018-03-13 stsp 	}
1234 bd1223b9 2018-03-14 stsp 
1235 9feb4ff2 2018-03-14 stsp 	return NULL;
1236 ac544f8c 2019-01-13 stsp }
1237 ac544f8c 2019-01-13 stsp 
1238 ac544f8c 2019-01-13 stsp const struct got_error *
1239 42c69117 2019-11-10 stsp got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1240 42c69117 2019-11-10 stsp     struct got_pack *pack)
1241 ac544f8c 2019-01-13 stsp {
1242 85a703fa 2019-01-13 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1243 85a703fa 2019-01-13 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1244 85a703fa 2019-01-13 stsp 
1245 d582f26c 2020-03-18 stsp 	return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1246 22484865 2018-03-13 stsp }
1247 22484865 2018-03-13 stsp 
1248 668a20f6 2020-03-18 stsp const struct got_error *
1249 4788f1ce 2020-03-18 stsp got_pack_dump_delta_chain_to_file(size_t *result_size,
1250 4788f1ce 2020-03-18 stsp     struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1251 4788f1ce 2020-03-18 stsp     FILE *base_file, FILE *accum_file)
1252 efd2a263 2018-01-19 stsp {
1253 efd2a263 2018-01-19 stsp 	const struct got_error *err = NULL;
1254 6691714a 2018-01-23 stsp 	struct got_delta *delta;
1255 42c69117 2019-11-10 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1256 42c69117 2019-11-10 stsp 	size_t base_bufsz = 0, accum_size = 0, delta_len;
1257 22484865 2018-03-13 stsp 	uint64_t max_size;
1258 6691714a 2018-01-23 stsp 	int n = 0;
1259 b29656e2 2018-03-16 stsp 
1260 b29656e2 2018-03-16 stsp 	*result_size = 0;
1261 3ee5fc21 2018-01-17 stsp 
1262 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1263 6691714a 2018-01-23 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1264 efd2a263 2018-01-19 stsp 
1265 8628c62d 2018-03-15 stsp 	/* We process small enough files entirely in memory for speed. */
1266 d582f26c 2020-03-18 stsp 	err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1267 22484865 2018-03-13 stsp 	if (err)
1268 22484865 2018-03-13 stsp 		return err;
1269 8628c62d 2018-03-15 stsp 	if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX) {
1270 8628c62d 2018-03-15 stsp 		accum_buf = malloc(max_size);
1271 8628c62d 2018-03-15 stsp 		if (accum_buf == NULL)
1272 638f9024 2019-05-13 stsp 			return got_error_from_errno("malloc");
1273 3840f4c9 2018-09-12 stsp 		base_file = NULL;
1274 3840f4c9 2018-09-12 stsp 		accum_file = NULL;
1275 b490237f 2022-01-12 thomas 	} else {
1276 b490237f 2022-01-12 thomas 		if (fseeko(base_file, 0L, SEEK_SET) == -1)
1277 b490237f 2022-01-12 thomas 			return got_error_from_errno("fseeko");
1278 b490237f 2022-01-12 thomas 		if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1279 b490237f 2022-01-12 thomas 			return got_error_from_errno("fseeko");
1280 6691714a 2018-01-23 stsp 	}
1281 efd2a263 2018-01-19 stsp 
1282 6691714a 2018-01-23 stsp 	/* Deltas are ordered in ascending order. */
1283 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1284 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1285 a6b158cc 2018-02-11 stsp 		if (n == 0) {
1286 34fca9c3 2018-11-11 stsp 			size_t mapoff;
1287 0c048b15 2018-04-27 stsp 			off_t delta_data_offset;
1288 9db65d41 2018-03-14 stsp 
1289 a6b158cc 2018-02-11 stsp 			/* Plain object types are the delta base. */
1290 a6b158cc 2018-02-11 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1291 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1292 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1293 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1294 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1295 72eb3431 2018-04-01 stsp 				goto done;
1296 72eb3431 2018-04-01 stsp 			}
1297 72eb3431 2018-04-01 stsp 
1298 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1299 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1300 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1301 0c048b15 2018-04-27 stsp 				goto done;
1302 0c048b15 2018-04-27 stsp 			}
1303 d7464085 2018-07-09 stsp 			if (pack->map == NULL) {
1304 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1305 d7464085 2018-07-09 stsp 				    == -1) {
1306 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1307 d7464085 2018-07-09 stsp 					goto done;
1308 d7464085 2018-07-09 stsp 				}
1309 bdd2fbb3 2018-02-11 stsp 			}
1310 d7464085 2018-07-09 stsp 			if (base_file) {
1311 d7464085 2018-07-09 stsp 				if (pack->map) {
1312 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1313 d7464085 2018-07-09 stsp 					err = got_inflate_to_file_mmap(
1314 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->map,
1315 4788f1ce 2020-03-18 stsp 					    mapoff, pack->filesize - mapoff,
1316 4788f1ce 2020-03-18 stsp 					    base_file);
1317 d7464085 2018-07-09 stsp 				} else
1318 34fca9c3 2018-11-11 stsp 					err = got_inflate_to_file_fd(
1319 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->fd,
1320 4788f1ce 2020-03-18 stsp 					    base_file);
1321 d7464085 2018-07-09 stsp 			} else {
1322 d7464085 2018-07-09 stsp 				if (pack->map) {
1323 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1324 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_mmap(&base_buf,
1325 2e5a6fad 2020-03-18 stsp 					    &base_bufsz, NULL, NULL,
1326 2e5a6fad 2020-03-18 stsp 					    pack->map, mapoff,
1327 d7464085 2018-07-09 stsp 					    pack->filesize - mapoff);
1328 d7464085 2018-07-09 stsp 				} else
1329 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_fd(&base_buf,
1330 55fdd257 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, max_size,
1331 55fdd257 2020-03-18 stsp 					    pack->fd);
1332 8628c62d 2018-03-15 stsp 			}
1333 a6b158cc 2018-02-11 stsp 			if (err)
1334 a6b158cc 2018-02-11 stsp 				goto done;
1335 a6b158cc 2018-02-11 stsp 			n++;
1336 8628c62d 2018-03-15 stsp 			if (base_file)
1337 8628c62d 2018-03-15 stsp 				rewind(base_file);
1338 a6b158cc 2018-02-11 stsp 			continue;
1339 9db65d41 2018-03-14 stsp 		}
1340 885d3e02 2018-01-27 stsp 
1341 ab2f42e7 2019-11-10 stsp 		got_delta_cache_get(&delta_buf, &delta_len,
1342 ab2f42e7 2019-11-10 stsp 		    pack->delta_cache, delta->data_offset);
1343 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1344 ab2f42e7 2019-11-10 stsp 			cached = 0;
1345 9249e7e3 2022-05-12 thomas 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1346 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1347 ab2f42e7 2019-11-10 stsp 			if (err)
1348 ab2f42e7 2019-11-10 stsp 				goto done;
1349 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1350 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1351 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1352 ab2f42e7 2019-11-10 stsp 				cached = 1;
1353 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1354 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1355 ab2f42e7 2019-11-10 stsp 				goto done;
1356 ab2f42e7 2019-11-10 stsp 			}
1357 ab2f42e7 2019-11-10 stsp 		}
1358 8628c62d 2018-03-15 stsp 		if (base_buf) {
1359 34fca9c3 2018-11-11 stsp 			err = got_delta_apply_in_mem(base_buf, base_bufsz,
1360 42c69117 2019-11-10 stsp 			    delta_buf, delta_len, accum_buf,
1361 34fca9c3 2018-11-11 stsp 			    &accum_size, max_size);
1362 8628c62d 2018-03-15 stsp 			n++;
1363 8628c62d 2018-03-15 stsp 		} else {
1364 42c69117 2019-11-10 stsp 			err = got_delta_apply(base_file, delta_buf,
1365 42c69117 2019-11-10 stsp 			    delta_len,
1366 8628c62d 2018-03-15 stsp 			    /* Final delta application writes to output file. */
1367 b29656e2 2018-03-16 stsp 			    ++n < deltas->nentries ? accum_file : outfile,
1368 b29656e2 2018-03-16 stsp 			    &accum_size);
1369 8628c62d 2018-03-15 stsp 		}
1370 ab2f42e7 2019-11-10 stsp 		if (!cached)
1371 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1372 6691714a 2018-01-23 stsp 		if (err)
1373 6691714a 2018-01-23 stsp 			goto done;
1374 6691714a 2018-01-23 stsp 
1375 710bb5ca 2018-01-23 stsp 		if (n < deltas->nentries) {
1376 6691714a 2018-01-23 stsp 			/* Accumulated delta becomes the new base. */
1377 8628c62d 2018-03-15 stsp 			if (base_buf) {
1378 8628c62d 2018-03-15 stsp 				uint8_t *tmp = accum_buf;
1379 34fca9c3 2018-11-11 stsp 				/*
1380 34fca9c3 2018-11-11 stsp 				 * Base buffer switches roles with accumulation
1381 34fca9c3 2018-11-11 stsp 				 * buffer. Ensure it can hold the largest
1382 34fca9c3 2018-11-11 stsp 				 * result in the delta chain. The initial
1383 34fca9c3 2018-11-11 stsp 				 * allocation might have been smaller.
1384 34fca9c3 2018-11-11 stsp 				 */
1385 34fca9c3 2018-11-11 stsp 				if (base_bufsz < max_size) {
1386 34fca9c3 2018-11-11 stsp 					uint8_t *p;
1387 34fca9c3 2018-11-11 stsp 					p = reallocarray(base_buf, 1, max_size);
1388 34fca9c3 2018-11-11 stsp 					if (p == NULL) {
1389 638f9024 2019-05-13 stsp 						err = got_error_from_errno(
1390 230a42bd 2019-05-11 jcs 						    "reallocarray");
1391 34fca9c3 2018-11-11 stsp 						goto done;
1392 34fca9c3 2018-11-11 stsp 					}
1393 34fca9c3 2018-11-11 stsp 					base_buf = p;
1394 34fca9c3 2018-11-11 stsp 					base_bufsz = max_size;
1395 34fca9c3 2018-11-11 stsp 				}
1396 8628c62d 2018-03-15 stsp 				accum_buf = base_buf;
1397 8628c62d 2018-03-15 stsp 				base_buf = tmp;
1398 8628c62d 2018-03-15 stsp 			} else {
1399 8628c62d 2018-03-15 stsp 				FILE *tmp = accum_file;
1400 8628c62d 2018-03-15 stsp 				accum_file = base_file;
1401 8628c62d 2018-03-15 stsp 				base_file = tmp;
1402 8628c62d 2018-03-15 stsp 				rewind(base_file);
1403 8628c62d 2018-03-15 stsp 				rewind(accum_file);
1404 8628c62d 2018-03-15 stsp 			}
1405 6691714a 2018-01-23 stsp 		}
1406 6691714a 2018-01-23 stsp 	}
1407 6691714a 2018-01-23 stsp 
1408 6691714a 2018-01-23 stsp done:
1409 8628c62d 2018-03-15 stsp 	free(base_buf);
1410 8628c62d 2018-03-15 stsp 	if (accum_buf) {
1411 8628c62d 2018-03-15 stsp 		size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1412 8628c62d 2018-03-15 stsp 		free(accum_buf);
1413 8628c62d 2018-03-15 stsp 		if (len != accum_size)
1414 673702af 2018-07-23 stsp 			err = got_ferror(outfile, GOT_ERR_IO);
1415 8628c62d 2018-03-15 stsp 	}
1416 6691714a 2018-01-23 stsp 	rewind(outfile);
1417 b29656e2 2018-03-16 stsp 	if (err == NULL)
1418 b29656e2 2018-03-16 stsp 		*result_size = accum_size;
1419 e0ab43e7 2018-03-16 stsp 	return err;
1420 e0ab43e7 2018-03-16 stsp }
1421 e0ab43e7 2018-03-16 stsp 
1422 668a20f6 2020-03-18 stsp const struct got_error *
1423 668a20f6 2020-03-18 stsp got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1424 48095039 2018-09-09 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1425 e0ab43e7 2018-03-16 stsp {
1426 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1427 e0ab43e7 2018-03-16 stsp 	struct got_delta *delta;
1428 42c69117 2019-11-10 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL, *delta_buf;
1429 42c69117 2019-11-10 stsp 	size_t base_bufsz = 0, accum_size = 0, delta_len;
1430 e0ab43e7 2018-03-16 stsp 	uint64_t max_size;
1431 e0ab43e7 2018-03-16 stsp 	int n = 0;
1432 e0ab43e7 2018-03-16 stsp 
1433 e0ab43e7 2018-03-16 stsp 	*outbuf = NULL;
1434 e0ab43e7 2018-03-16 stsp 	*outlen = 0;
1435 e0ab43e7 2018-03-16 stsp 
1436 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1437 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1438 e0ab43e7 2018-03-16 stsp 
1439 d582f26c 2020-03-18 stsp 	err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
1440 e0ab43e7 2018-03-16 stsp 	if (err)
1441 e0ab43e7 2018-03-16 stsp 		return err;
1442 e0ab43e7 2018-03-16 stsp 	accum_buf = malloc(max_size);
1443 e0ab43e7 2018-03-16 stsp 	if (accum_buf == NULL)
1444 638f9024 2019-05-13 stsp 		return got_error_from_errno("malloc");
1445 e0ab43e7 2018-03-16 stsp 
1446 e0ab43e7 2018-03-16 stsp 	/* Deltas are ordered in ascending order. */
1447 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1448 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1449 e0ab43e7 2018-03-16 stsp 		if (n == 0) {
1450 0c048b15 2018-04-27 stsp 			size_t delta_data_offset;
1451 e0ab43e7 2018-03-16 stsp 
1452 e0ab43e7 2018-03-16 stsp 			/* Plain object types are the delta base. */
1453 e0ab43e7 2018-03-16 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1454 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1455 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1456 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1457 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1458 72eb3431 2018-04-01 stsp 				goto done;
1459 72eb3431 2018-04-01 stsp 			}
1460 72eb3431 2018-04-01 stsp 
1461 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1462 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1463 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1464 0c048b15 2018-04-27 stsp 				goto done;
1465 0c048b15 2018-04-27 stsp 			}
1466 d7464085 2018-07-09 stsp 			if (pack->map) {
1467 d7464085 2018-07-09 stsp 				size_t mapoff = (size_t)delta_data_offset;
1468 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_mmap(&base_buf,
1469 2e5a6fad 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, pack->map,
1470 2e5a6fad 2020-03-18 stsp 				    mapoff, pack->filesize - mapoff);
1471 d7464085 2018-07-09 stsp 			} else {
1472 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1473 d7464085 2018-07-09 stsp 				    == -1) {
1474 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1475 d7464085 2018-07-09 stsp 					goto done;
1476 d7464085 2018-07-09 stsp 				}
1477 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_fd(&base_buf,
1478 55fdd257 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, max_size,
1479 55fdd257 2020-03-18 stsp 				    pack->fd);
1480 e0ab43e7 2018-03-16 stsp 			}
1481 d7464085 2018-07-09 stsp 			if (err)
1482 d7464085 2018-07-09 stsp 				goto done;
1483 e0ab43e7 2018-03-16 stsp 			n++;
1484 e0ab43e7 2018-03-16 stsp 			continue;
1485 e0ab43e7 2018-03-16 stsp 		}
1486 e0ab43e7 2018-03-16 stsp 
1487 ab2f42e7 2019-11-10 stsp 		got_delta_cache_get(&delta_buf, &delta_len,
1488 ab2f42e7 2019-11-10 stsp 		    pack->delta_cache, delta->data_offset);
1489 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1490 ab2f42e7 2019-11-10 stsp 			cached = 0;
1491 9249e7e3 2022-05-12 thomas 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1492 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1493 ab2f42e7 2019-11-10 stsp 			if (err)
1494 ab2f42e7 2019-11-10 stsp 				goto done;
1495 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1496 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1497 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1498 ab2f42e7 2019-11-10 stsp 				cached = 1;
1499 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1500 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1501 ab2f42e7 2019-11-10 stsp 				goto done;
1502 ab2f42e7 2019-11-10 stsp 			}
1503 ab2f42e7 2019-11-10 stsp 		}
1504 34fca9c3 2018-11-11 stsp 		err = got_delta_apply_in_mem(base_buf, base_bufsz,
1505 42c69117 2019-11-10 stsp 		    delta_buf, delta_len, accum_buf,
1506 34fca9c3 2018-11-11 stsp 		    &accum_size, max_size);
1507 ab2f42e7 2019-11-10 stsp 		if (!cached)
1508 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1509 e0ab43e7 2018-03-16 stsp 		n++;
1510 e0ab43e7 2018-03-16 stsp 		if (err)
1511 e0ab43e7 2018-03-16 stsp 			goto done;
1512 e0ab43e7 2018-03-16 stsp 
1513 e0ab43e7 2018-03-16 stsp 		if (n < deltas->nentries) {
1514 e0ab43e7 2018-03-16 stsp 			/* Accumulated delta becomes the new base. */
1515 e0ab43e7 2018-03-16 stsp 			uint8_t *tmp = accum_buf;
1516 34fca9c3 2018-11-11 stsp 			/*
1517 34fca9c3 2018-11-11 stsp 			 * Base buffer switches roles with accumulation buffer.
1518 34fca9c3 2018-11-11 stsp 			 * Ensure it can hold the largest result in the delta
1519 34fca9c3 2018-11-11 stsp 			 * chain. Initial allocation might have been smaller.
1520 34fca9c3 2018-11-11 stsp 			 */
1521 34fca9c3 2018-11-11 stsp 			if (base_bufsz < max_size) {
1522 34fca9c3 2018-11-11 stsp 				uint8_t *p;
1523 34fca9c3 2018-11-11 stsp 				p = reallocarray(base_buf, 1, max_size);
1524 34fca9c3 2018-11-11 stsp 				if (p == NULL) {
1525 638f9024 2019-05-13 stsp 					err = got_error_from_errno(
1526 230a42bd 2019-05-11 jcs 					    "reallocarray");
1527 34fca9c3 2018-11-11 stsp 					goto done;
1528 34fca9c3 2018-11-11 stsp 				}
1529 34fca9c3 2018-11-11 stsp 				base_buf = p;
1530 34fca9c3 2018-11-11 stsp 				base_bufsz = max_size;
1531 34fca9c3 2018-11-11 stsp 			}
1532 e0ab43e7 2018-03-16 stsp 			accum_buf = base_buf;
1533 e0ab43e7 2018-03-16 stsp 			base_buf = tmp;
1534 e0ab43e7 2018-03-16 stsp 		}
1535 e0ab43e7 2018-03-16 stsp 	}
1536 e0ab43e7 2018-03-16 stsp 
1537 e0ab43e7 2018-03-16 stsp done:
1538 e0ab43e7 2018-03-16 stsp 	free(base_buf);
1539 e0ab43e7 2018-03-16 stsp 	if (err) {
1540 e0ab43e7 2018-03-16 stsp 		free(accum_buf);
1541 e0ab43e7 2018-03-16 stsp 		*outbuf = NULL;
1542 e0ab43e7 2018-03-16 stsp 		*outlen = 0;
1543 e0ab43e7 2018-03-16 stsp 	} else {
1544 e0ab43e7 2018-03-16 stsp 		*outbuf = accum_buf;
1545 e0ab43e7 2018-03-16 stsp 		*outlen = accum_size;
1546 e0ab43e7 2018-03-16 stsp 	}
1547 efd2a263 2018-01-19 stsp 	return err;
1548 efd2a263 2018-01-19 stsp }
1549 efd2a263 2018-01-19 stsp 
1550 3ee5fc21 2018-01-17 stsp const struct got_error *
1551 24140570 2018-09-09 stsp got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1552 3840f4c9 2018-09-12 stsp     FILE *outfile, FILE *base_file, FILE *accum_file)
1553 3ee5fc21 2018-01-17 stsp {
1554 3ee5fc21 2018-01-17 stsp 	const struct got_error *err = NULL;
1555 3ee5fc21 2018-01-17 stsp 
1556 3ee5fc21 2018-01-17 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1557 3ee5fc21 2018-01-17 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1558 2ce68b2f 2018-09-09 stsp 
1559 ef2bccd9 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1560 24140570 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1561 24140570 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1562 72eb3431 2018-04-01 stsp 
1563 d7464085 2018-07-09 stsp 		if (pack->map) {
1564 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1565 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1566 4788f1ce 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff,
1567 4788f1ce 2020-03-18 stsp 			    outfile);
1568 d7464085 2018-07-09 stsp 		} else {
1569 24140570 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1570 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1571 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1572 4788f1ce 2020-03-18 stsp 			    pack->fd, outfile);
1573 d7464085 2018-07-09 stsp 		}
1574 040bf4a1 2018-04-01 stsp 	} else
1575 4788f1ce 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_file(&obj->size,
1576 4788f1ce 2020-03-18 stsp 		    &obj->deltas, pack, outfile, base_file, accum_file);
1577 24140570 2018-09-09 stsp 
1578 a1fd68d8 2018-01-12 stsp 	return err;
1579 a1fd68d8 2018-01-12 stsp }
1580 e0ab43e7 2018-03-16 stsp 
1581 e0ab43e7 2018-03-16 stsp const struct got_error *
1582 e0ab43e7 2018-03-16 stsp got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1583 7e212e3d 2018-09-09 stsp     struct got_object *obj, struct got_pack *pack)
1584 e0ab43e7 2018-03-16 stsp {
1585 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1586 e0ab43e7 2018-03-16 stsp 
1587 e0ab43e7 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1588 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1589 72eb3431 2018-04-01 stsp 
1590 48095039 2018-09-09 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1591 7e212e3d 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1592 7e212e3d 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1593 d7464085 2018-07-09 stsp 		if (pack->map) {
1594 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1595 2e5a6fad 2020-03-18 stsp 			err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1596 2e5a6fad 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff);
1597 d7464085 2018-07-09 stsp 		} else {
1598 7e212e3d 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1599 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1600 1e87a3c3 2020-03-18 stsp 			err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1601 55fdd257 2020-03-18 stsp 			    obj->size, pack->fd);
1602 e0ab43e7 2018-03-16 stsp 		}
1603 e0ab43e7 2018-03-16 stsp 	} else
1604 668a20f6 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1605 668a20f6 2020-03-18 stsp 		    pack);
1606 7e212e3d 2018-09-09 stsp 
1607 e0ab43e7 2018-03-16 stsp 	return err;
1608 e0ab43e7 2018-03-16 stsp }
1609 f9c2e8e5 2022-02-13 thomas 
1610 9249e7e3 2022-05-12 thomas static const struct got_error *
1611 9249e7e3 2022-05-12 thomas read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1612 9249e7e3 2022-05-12 thomas     size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1613 9249e7e3 2022-05-12 thomas     off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1614 9249e7e3 2022-05-12 thomas {
1615 9249e7e3 2022-05-12 thomas 	const struct got_error *err = NULL;
1616 9249e7e3 2022-05-12 thomas 
1617 9249e7e3 2022-05-12 thomas 	/* Validate decompression and obtain the decompressed size. */
1618 9249e7e3 2022-05-12 thomas 	err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1619 9249e7e3 2022-05-12 thomas 	    delta_data_offset, pack);
1620 9249e7e3 2022-05-12 thomas 	if (err)
1621 9249e7e3 2022-05-12 thomas 		return err;
1622 9249e7e3 2022-05-12 thomas 
1623 9249e7e3 2022-05-12 thomas 	/* Read delta base/result sizes from head of delta stream. */
1624 9249e7e3 2022-05-12 thomas 	err = got_delta_get_sizes(base_size, result_size,
1625 9249e7e3 2022-05-12 thomas 	    *delta_buf, *delta_len);
1626 9249e7e3 2022-05-12 thomas 	if (err)
1627 9249e7e3 2022-05-12 thomas 		goto done;
1628 9249e7e3 2022-05-12 thomas 
1629 9249e7e3 2022-05-12 thomas 	/* Discard decompressed delta and read it again in compressed form. */
1630 9249e7e3 2022-05-12 thomas 	free(*delta_buf);
1631 9249e7e3 2022-05-12 thomas 	*delta_buf = malloc(*delta_len_compressed);
1632 9249e7e3 2022-05-12 thomas 	if (*delta_buf == NULL) {
1633 9249e7e3 2022-05-12 thomas 		err = got_error_from_errno("malloc");
1634 9249e7e3 2022-05-12 thomas 		goto done;
1635 9249e7e3 2022-05-12 thomas 	}
1636 9249e7e3 2022-05-12 thomas 	if (pack->map) {
1637 9249e7e3 2022-05-12 thomas 		if (delta_data_offset >= pack->filesize)
1638 9249e7e3 2022-05-12 thomas 			err = got_error(GOT_ERR_PACK_OFFSET);
1639 9249e7e3 2022-05-12 thomas 		memcpy(*delta_buf, pack->map + delta_data_offset,
1640 9249e7e3 2022-05-12 thomas 		    *delta_len_compressed);
1641 9249e7e3 2022-05-12 thomas 	} else {
1642 9249e7e3 2022-05-12 thomas 		ssize_t n;
1643 9249e7e3 2022-05-12 thomas 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1644 9249e7e3 2022-05-12 thomas 			err = got_error_from_errno("lseek");
1645 9249e7e3 2022-05-12 thomas 			goto done;
1646 9249e7e3 2022-05-12 thomas 		}
1647 9249e7e3 2022-05-12 thomas 		n = read(pack->fd, *delta_buf, *delta_len_compressed);
1648 9249e7e3 2022-05-12 thomas 		if (n < 0) {
1649 9249e7e3 2022-05-12 thomas 			err = got_error_from_errno("read");
1650 9249e7e3 2022-05-12 thomas 			goto done;
1651 9249e7e3 2022-05-12 thomas 		} else if (n != *delta_len_compressed) {
1652 9249e7e3 2022-05-12 thomas 			err = got_error(GOT_ERR_IO);
1653 9249e7e3 2022-05-12 thomas 			goto done;
1654 9249e7e3 2022-05-12 thomas 		}
1655 9249e7e3 2022-05-12 thomas 	}
1656 9249e7e3 2022-05-12 thomas done:
1657 9249e7e3 2022-05-12 thomas 	if (err) {
1658 9249e7e3 2022-05-12 thomas 		free(*delta_buf);
1659 9249e7e3 2022-05-12 thomas 		*delta_buf = NULL;
1660 9249e7e3 2022-05-12 thomas 		*delta_len = 0;
1661 9249e7e3 2022-05-12 thomas 		*delta_len_compressed = 0;
1662 9249e7e3 2022-05-12 thomas 		*base_size = 0;
1663 9249e7e3 2022-05-12 thomas 		*result_size = 0;
1664 9249e7e3 2022-05-12 thomas 	}
1665 9249e7e3 2022-05-12 thomas 	return err;
1666 9249e7e3 2022-05-12 thomas }
1667 9249e7e3 2022-05-12 thomas 
1668 f9c2e8e5 2022-02-13 thomas const struct got_error *
1669 f9c2e8e5 2022-02-13 thomas got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1670 9249e7e3 2022-05-12 thomas     size_t *delta_compressed_size, off_t *delta_offset, off_t *base_offset,
1671 9249e7e3 2022-05-12 thomas     struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1672 9249e7e3 2022-05-12 thomas     struct got_pack *pack, struct got_packidx *packidx, int idx)
1673 f9c2e8e5 2022-02-13 thomas {
1674 f9c2e8e5 2022-02-13 thomas 	const struct got_error *err = NULL;
1675 f9c2e8e5 2022-02-13 thomas 	off_t offset;
1676 f9c2e8e5 2022-02-13 thomas 	uint8_t type;
1677 f9c2e8e5 2022-02-13 thomas 	uint64_t size;
1678 f9c2e8e5 2022-02-13 thomas 	size_t tslen, delta_hdrlen;
1679 9249e7e3 2022-05-12 thomas 	off_t delta_data_offset;
1680 f9c2e8e5 2022-02-13 thomas 
1681 f9c2e8e5 2022-02-13 thomas 	*delta_buf = NULL;
1682 f9c2e8e5 2022-02-13 thomas 	*delta_size = 0;
1683 9249e7e3 2022-05-12 thomas 	*delta_compressed_size = 0;
1684 f9c2e8e5 2022-02-13 thomas 	*delta_offset = 0;
1685 f9c2e8e5 2022-02-13 thomas 	*base_offset = 0;
1686 f9c2e8e5 2022-02-13 thomas 	*base_size = 0;
1687 f9c2e8e5 2022-02-13 thomas 	*result_size = 0;
1688 f9c2e8e5 2022-02-13 thomas 
1689 f9c2e8e5 2022-02-13 thomas 	offset = got_packidx_get_object_offset(packidx, idx);
1690 f9c2e8e5 2022-02-13 thomas 	if (offset == (uint64_t)-1)
1691 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_PACKIDX);
1692 f9c2e8e5 2022-02-13 thomas 
1693 f9c2e8e5 2022-02-13 thomas 	if (offset >= pack->filesize)
1694 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_PACK_OFFSET);
1695 f9c2e8e5 2022-02-13 thomas 
1696 f9c2e8e5 2022-02-13 thomas 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1697 f9c2e8e5 2022-02-13 thomas 	    pack, offset);
1698 f9c2e8e5 2022-02-13 thomas 	if (err)
1699 f9c2e8e5 2022-02-13 thomas 		return err;
1700 f9c2e8e5 2022-02-13 thomas 
1701 f9c2e8e5 2022-02-13 thomas 	if (tslen + size < tslen || offset + size < size ||
1702 f9c2e8e5 2022-02-13 thomas 	    tslen + offset < tslen)
1703 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_PACK_OFFSET);
1704 f9c2e8e5 2022-02-13 thomas 
1705 f9c2e8e5 2022-02-13 thomas 	switch (type) {
1706 f9c2e8e5 2022-02-13 thomas 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1707 f9c2e8e5 2022-02-13 thomas 		err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1708 f9c2e8e5 2022-02-13 thomas 		    pack, offset, tslen);
1709 f9c2e8e5 2022-02-13 thomas 		if (err)
1710 f9c2e8e5 2022-02-13 thomas 			return err;
1711 f9c2e8e5 2022-02-13 thomas 		break;
1712 f9c2e8e5 2022-02-13 thomas 	case GOT_OBJ_TYPE_REF_DELTA:
1713 f9c2e8e5 2022-02-13 thomas 		err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1714 f9c2e8e5 2022-02-13 thomas 		if (err)
1715 f9c2e8e5 2022-02-13 thomas 			return err;
1716 f9c2e8e5 2022-02-13 thomas 		delta_hdrlen = SHA1_DIGEST_LENGTH;
1717 f9c2e8e5 2022-02-13 thomas 		break;
1718 f9c2e8e5 2022-02-13 thomas 	default:
1719 f9c2e8e5 2022-02-13 thomas 		return got_error_fmt(GOT_ERR_OBJ_TYPE,
1720 f9c2e8e5 2022-02-13 thomas 		    "non-delta object type %d found at offset %llu",
1721 f9c2e8e5 2022-02-13 thomas 		    type, offset);
1722 f9c2e8e5 2022-02-13 thomas 	}
1723 f9c2e8e5 2022-02-13 thomas 
1724 f9c2e8e5 2022-02-13 thomas 	if (tslen + delta_hdrlen < delta_hdrlen ||
1725 f9c2e8e5 2022-02-13 thomas 	    offset + delta_hdrlen < delta_hdrlen)
1726 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_DELTA);
1727 f9c2e8e5 2022-02-13 thomas 
1728 9249e7e3 2022-05-12 thomas 	delta_data_offset = offset + tslen + delta_hdrlen;
1729 9249e7e3 2022-05-12 thomas 	err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1730 9249e7e3 2022-05-12 thomas 	    base_size, result_size, delta_data_offset, pack, packidx);
1731 f9c2e8e5 2022-02-13 thomas 	if (err)
1732 f9c2e8e5 2022-02-13 thomas 		return err;
1733 f9c2e8e5 2022-02-13 thomas 
1734 f9c2e8e5 2022-02-13 thomas 	if (*delta_size != size) {
1735 f9c2e8e5 2022-02-13 thomas 		err = got_error(GOT_ERR_BAD_DELTA);
1736 f9c2e8e5 2022-02-13 thomas 		goto done;
1737 f9c2e8e5 2022-02-13 thomas 	}
1738 f9c2e8e5 2022-02-13 thomas 
1739 f9c2e8e5 2022-02-13 thomas 	*delta_offset = offset;
1740 f9c2e8e5 2022-02-13 thomas done:
1741 f9c2e8e5 2022-02-13 thomas 	if (err) {
1742 f9c2e8e5 2022-02-13 thomas 		free(*delta_buf);
1743 f9c2e8e5 2022-02-13 thomas 		*delta_buf = NULL;
1744 9249e7e3 2022-05-12 thomas 		*delta_size = 0;
1745 9249e7e3 2022-05-12 thomas 		*delta_compressed_size = 0;
1746 9249e7e3 2022-05-12 thomas 		*delta_offset = 0;
1747 9249e7e3 2022-05-12 thomas 		*base_offset = 0;
1748 9249e7e3 2022-05-12 thomas 		*base_size = 0;
1749 9249e7e3 2022-05-12 thomas 		*result_size = 0;
1750 f9c2e8e5 2022-02-13 thomas 	}
1751 f9c2e8e5 2022-02-13 thomas 	return err;
1752 f9c2e8e5 2022-02-13 thomas }