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 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
  20 876c234b 2018-09-10 stsp #include <sys/uio.h>
  21 57b35b75 2018-06-22 stsp #include <sys/mman.h>
  22 68036464 2022-06-26 thomas #include <sys/resource.h>
  23 68036464 2022-06-26 thomas #include <sys/socket.h>
  24 0a0a3048 2018-01-10 stsp 
  25 7e656b93 2018-03-17 stsp #include <fcntl.h>
  26 a1fd68d8 2018-01-12 stsp #include <errno.h>
  27 0a0a3048 2018-01-10 stsp #include <stdio.h>
  28 a1fd68d8 2018-01-12 stsp #include <stdint.h>
  29 0a0a3048 2018-01-10 stsp #include <stdlib.h>
  30 0a0a3048 2018-01-10 stsp #include <string.h>
  31 0a0a3048 2018-01-10 stsp #include <limits.h>
  32 81a12da5 2020-09-09 naddy #include <unistd.h>
  33 a1fd68d8 2018-01-12 stsp #include <zlib.h>
  34 0a0a3048 2018-01-10 stsp 
  35 0a0a3048 2018-01-10 stsp #include "got_error.h"
  36 a1fd68d8 2018-01-12 stsp #include "got_object.h"
  37 324d37e7 2019-05-11 stsp #include "got_path.h"
  38 0a0a3048 2018-01-10 stsp 
  39 718b3ab0 2018-03-17 stsp #include "got_lib_sha1.h"
  40 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
  41 ab2f42e7 2019-11-10 stsp #include "got_lib_delta_cache.h"
  42 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
  43 718b3ab0 2018-03-17 stsp #include "got_lib_object.h"
  44 dd88155e 2019-06-29 stsp #include "got_lib_object_parse.h"
  45 876c234b 2018-09-10 stsp #include "got_lib_privsep.h"
  46 15a94983 2018-12-23 stsp #include "got_lib_pack.h"
  47 79b11c62 2018-03-09 stsp 
  48 79b11c62 2018-03-09 stsp #ifndef nitems
  49 79b11c62 2018-03-09 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  50 79b11c62 2018-03-09 stsp #endif
  51 1411938b 2018-02-12 stsp 
  52 a1fd68d8 2018-01-12 stsp #ifndef MIN
  53 a1fd68d8 2018-01-12 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  54 a1fd68d8 2018-01-12 stsp #endif
  55 a1fd68d8 2018-01-12 stsp 
  56 0a0a3048 2018-01-10 stsp static const struct got_error *
  57 0a0a3048 2018-01-10 stsp verify_fanout_table(uint32_t *fanout_table)
  58 0a0a3048 2018-01-10 stsp {
  59 0a0a3048 2018-01-10 stsp 	int i;
  60 0a0a3048 2018-01-10 stsp 
  61 0a0a3048 2018-01-10 stsp 	for (i = 0; i < 0xff - 1; i++) {
  62 a1fd68d8 2018-01-12 stsp 		if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
  63 0a0a3048 2018-01-10 stsp 			return got_error(GOT_ERR_BAD_PACKIDX);
  64 0a0a3048 2018-01-10 stsp 	}
  65 0a0a3048 2018-01-10 stsp 
  66 0a0a3048 2018-01-10 stsp 	return NULL;
  67 0a0a3048 2018-01-10 stsp }
  68 0a0a3048 2018-01-10 stsp 
  69 1510f469 2018-09-09 stsp const struct got_error *
  70 c3564dfa 2021-07-15 stsp got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
  71 0a0a3048 2018-01-10 stsp {
  72 0a0a3048 2018-01-10 stsp 	const struct got_error *err = NULL;
  73 817c5a18 2018-09-09 stsp 	struct got_packidx_v2_hdr *h;
  74 0ebaf008 2018-01-10 stsp 	SHA1_CTX ctx;
  75 0ebaf008 2018-01-10 stsp 	uint8_t sha1[SHA1_DIGEST_LENGTH];
  76 817c5a18 2018-09-09 stsp 	size_t nobj, len_fanout, len_ids, offset, remain;
  77 817c5a18 2018-09-09 stsp 	ssize_t n;
  78 5e6be232 2019-11-08 stsp 	int i;
  79 0a0a3048 2018-01-10 stsp 
  80 0ebaf008 2018-01-10 stsp 	SHA1Init(&ctx);
  81 0ebaf008 2018-01-10 stsp 
  82 57b35b75 2018-06-22 stsp 	h = &p->hdr;
  83 57b35b75 2018-06-22 stsp 	offset = 0;
  84 57b35b75 2018-06-22 stsp 	remain = p->len;
  85 0a0a3048 2018-01-10 stsp 
  86 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->magic)) {
  87 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
  88 0a0a3048 2018-01-10 stsp 		goto done;
  89 0a0a3048 2018-01-10 stsp 	}
  90 fc79a48d 2018-07-09 stsp 	if (p->map)
  91 fc79a48d 2018-07-09 stsp 		h->magic = (uint32_t *)(p->map + offset);
  92 fc79a48d 2018-07-09 stsp 	else {
  93 fc79a48d 2018-07-09 stsp 		h->magic = malloc(sizeof(*h->magic));
  94 fc79a48d 2018-07-09 stsp 		if (h->magic == NULL) {
  95 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
  96 fc79a48d 2018-07-09 stsp 			goto done;
  97 fc79a48d 2018-07-09 stsp 		}
  98 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->magic, sizeof(*h->magic));
  99 b1317e77 2019-09-22 stsp 		if (n < 0) {
 100 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 101 b1317e77 2019-09-22 stsp 			goto done;
 102 b1317e77 2019-09-22 stsp 		} else if (n != sizeof(*h->magic)) {
 103 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 104 fc79a48d 2018-07-09 stsp 			goto done;
 105 fc79a48d 2018-07-09 stsp 		}
 106 fc79a48d 2018-07-09 stsp 	}
 107 ac62b712 2021-03-30 stsp 	if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
 108 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 109 57b35b75 2018-06-22 stsp 		goto done;
 110 57b35b75 2018-06-22 stsp 	}
 111 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->magic);
 112 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->magic);
 113 0a0a3048 2018-01-10 stsp 
 114 0cb74cf4 2018-07-08 stsp 	if (verify)
 115 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
 116 0ebaf008 2018-01-10 stsp 
 117 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->version)) {
 118 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 119 0a0a3048 2018-01-10 stsp 		goto done;
 120 0a0a3048 2018-01-10 stsp 	}
 121 fc79a48d 2018-07-09 stsp 	if (p->map)
 122 fc79a48d 2018-07-09 stsp 		h->version = (uint32_t *)(p->map + offset);
 123 fc79a48d 2018-07-09 stsp 	else {
 124 fc79a48d 2018-07-09 stsp 		h->version = malloc(sizeof(*h->version));
 125 fc79a48d 2018-07-09 stsp 		if (h->version == NULL) {
 126 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 127 fc79a48d 2018-07-09 stsp 			goto done;
 128 fc79a48d 2018-07-09 stsp 		}
 129 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->version, sizeof(*h->version));
 130 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 131 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 132 c6368c2e 2019-10-11 stsp 			goto done;
 133 c6368c2e 2019-10-11 stsp 		} else if (n != sizeof(*h->version)) {
 134 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 135 fc79a48d 2018-07-09 stsp 			goto done;
 136 fc79a48d 2018-07-09 stsp 		}
 137 fc79a48d 2018-07-09 stsp 	}
 138 ac62b712 2021-03-30 stsp 	if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
 139 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 140 0a0a3048 2018-01-10 stsp 		goto done;
 141 0a0a3048 2018-01-10 stsp 	}
 142 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->version);
 143 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->version);
 144 0a0a3048 2018-01-10 stsp 
 145 0cb74cf4 2018-07-08 stsp 	if (verify)
 146 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
 147 0ebaf008 2018-01-10 stsp 
 148 57b35b75 2018-06-22 stsp 	len_fanout =
 149 57b35b75 2018-06-22 stsp 	    sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
 150 57b35b75 2018-06-22 stsp 	if (remain < len_fanout) {
 151 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 152 0a0a3048 2018-01-10 stsp 		goto done;
 153 0a0a3048 2018-01-10 stsp 	}
 154 fc79a48d 2018-07-09 stsp 	if (p->map)
 155 fc79a48d 2018-07-09 stsp 		h->fanout_table = (uint32_t *)(p->map + offset);
 156 fc79a48d 2018-07-09 stsp 	else {
 157 fc79a48d 2018-07-09 stsp 		h->fanout_table = malloc(len_fanout);
 158 fc79a48d 2018-07-09 stsp 		if (h->fanout_table == NULL) {
 159 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 160 fc79a48d 2018-07-09 stsp 			goto done;
 161 fc79a48d 2018-07-09 stsp 		}
 162 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->fanout_table, len_fanout);
 163 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 164 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 165 c6368c2e 2019-10-11 stsp 			goto done;
 166 c6368c2e 2019-10-11 stsp 		} else if (n != len_fanout) {
 167 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 168 fc79a48d 2018-07-09 stsp 			goto done;
 169 fc79a48d 2018-07-09 stsp 		}
 170 fc79a48d 2018-07-09 stsp 	}
 171 c8262310 2018-06-04 stsp 	err = verify_fanout_table(h->fanout_table);
 172 0a0a3048 2018-01-10 stsp 	if (err)
 173 0a0a3048 2018-01-10 stsp 		goto done;
 174 0cb74cf4 2018-07-08 stsp 	if (verify)
 175 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
 176 57b35b75 2018-06-22 stsp 	offset += len_fanout;
 177 57b35b75 2018-06-22 stsp 	remain -= len_fanout;
 178 0a0a3048 2018-01-10 stsp 
 179 78fb0967 2020-09-09 naddy 	nobj = be32toh(h->fanout_table[0xff]);
 180 57b35b75 2018-06-22 stsp 	len_ids = nobj * sizeof(*h->sorted_ids);
 181 57b35b75 2018-06-22 stsp 	if (len_ids <= nobj || len_ids > remain) {
 182 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 183 0a0a3048 2018-01-10 stsp 		goto done;
 184 0a0a3048 2018-01-10 stsp 	}
 185 fc79a48d 2018-07-09 stsp 	if (p->map)
 186 fc79a48d 2018-07-09 stsp 		h->sorted_ids =
 187 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
 188 fc79a48d 2018-07-09 stsp 	else {
 189 fc79a48d 2018-07-09 stsp 		h->sorted_ids = malloc(len_ids);
 190 fc79a48d 2018-07-09 stsp 		if (h->sorted_ids == NULL) {
 191 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 192 fc79a48d 2018-07-09 stsp 			goto done;
 193 fc79a48d 2018-07-09 stsp 		}
 194 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->sorted_ids, len_ids);
 195 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 196 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 197 faaa1c0f 2018-09-15 stsp 		else if (n != len_ids) {
 198 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 199 fc79a48d 2018-07-09 stsp 			goto done;
 200 fc79a48d 2018-07-09 stsp 		}
 201 fc79a48d 2018-07-09 stsp 	}
 202 0cb74cf4 2018-07-08 stsp 	if (verify)
 203 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
 204 57b35b75 2018-06-22 stsp 	offset += len_ids;
 205 57b35b75 2018-06-22 stsp 	remain -= len_ids;
 206 0a0a3048 2018-01-10 stsp 
 207 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->crc32)) {
 208 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 209 0a0a3048 2018-01-10 stsp 		goto done;
 210 0a0a3048 2018-01-10 stsp 	}
 211 fc79a48d 2018-07-09 stsp 	if (p->map)
 212 fc79a48d 2018-07-09 stsp 		h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
 213 fc79a48d 2018-07-09 stsp 	else {
 214 fc79a48d 2018-07-09 stsp 		h->crc32 = malloc(nobj * sizeof(*h->crc32));
 215 fc79a48d 2018-07-09 stsp 		if (h->crc32 == NULL) {
 216 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 217 fc79a48d 2018-07-09 stsp 			goto done;
 218 fc79a48d 2018-07-09 stsp 		}
 219 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
 220 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 221 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 222 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->crc32)) {
 223 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 224 fc79a48d 2018-07-09 stsp 			goto done;
 225 fc79a48d 2018-07-09 stsp 		}
 226 fc79a48d 2018-07-09 stsp 	}
 227 0cb74cf4 2018-07-08 stsp 	if (verify)
 228 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
 229 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->crc32);
 230 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->crc32);
 231 0ebaf008 2018-01-10 stsp 
 232 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->offsets)) {
 233 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 234 0a0a3048 2018-01-10 stsp 		goto done;
 235 0a0a3048 2018-01-10 stsp 	}
 236 fc79a48d 2018-07-09 stsp 	if (p->map)
 237 fc79a48d 2018-07-09 stsp 		h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
 238 fc79a48d 2018-07-09 stsp 	else {
 239 fc79a48d 2018-07-09 stsp 		h->offsets = malloc(nobj * sizeof(*h->offsets));
 240 fc79a48d 2018-07-09 stsp 		if (h->offsets == NULL) {
 241 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 242 fc79a48d 2018-07-09 stsp 			goto done;
 243 fc79a48d 2018-07-09 stsp 		}
 244 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
 245 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 246 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 247 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->offsets)) {
 248 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 249 fc79a48d 2018-07-09 stsp 			goto done;
 250 fc79a48d 2018-07-09 stsp 		}
 251 fc79a48d 2018-07-09 stsp 	}
 252 0cb74cf4 2018-07-08 stsp 	if (verify)
 253 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->offsets,
 254 0cb74cf4 2018-07-08 stsp 		    nobj * sizeof(*h->offsets));
 255 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->offsets);
 256 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->offsets);
 257 0ebaf008 2018-01-10 stsp 
 258 0a0a3048 2018-01-10 stsp 	/* Large file offsets are contained only in files > 2GB. */
 259 c3564dfa 2021-07-15 stsp 	if (verify || packfile_size > 0x7fffffff) {
 260 c3564dfa 2021-07-15 stsp 		for (i = 0; i < nobj; i++) {
 261 c3564dfa 2021-07-15 stsp 			uint32_t o = h->offsets[i];
 262 c3564dfa 2021-07-15 stsp 			if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
 263 c3564dfa 2021-07-15 stsp 				p->nlargeobj++;
 264 c3564dfa 2021-07-15 stsp 		}
 265 5e6be232 2019-11-08 stsp 	}
 266 5e6be232 2019-11-08 stsp 	if (p->nlargeobj == 0)
 267 0a0a3048 2018-01-10 stsp 		goto checksum;
 268 c3564dfa 2021-07-15 stsp 	else if (packfile_size <= 0x7fffffff) {
 269 c3564dfa 2021-07-15 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 270 c3564dfa 2021-07-15 stsp 		goto done;
 271 c3564dfa 2021-07-15 stsp 	}
 272 0a0a3048 2018-01-10 stsp 
 273 5e6be232 2019-11-08 stsp 	if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
 274 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 275 0a0a3048 2018-01-10 stsp 		goto done;
 276 0a0a3048 2018-01-10 stsp 	}
 277 fc79a48d 2018-07-09 stsp 	if (p->map)
 278 fc79a48d 2018-07-09 stsp 		h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
 279 fc79a48d 2018-07-09 stsp 	else {
 280 5e6be232 2019-11-08 stsp 		h->large_offsets = malloc(p->nlargeobj *
 281 5e6be232 2019-11-08 stsp 		    sizeof(*h->large_offsets));
 282 de30857e 2019-08-23 stsp 		if (h->large_offsets == NULL) {
 283 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 284 fc79a48d 2018-07-09 stsp 			goto done;
 285 fc79a48d 2018-07-09 stsp 		}
 286 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->large_offsets,
 287 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 288 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 289 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 290 5e6be232 2019-11-08 stsp 		else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
 291 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 292 fc79a48d 2018-07-09 stsp 			goto done;
 293 fc79a48d 2018-07-09 stsp 		}
 294 fc79a48d 2018-07-09 stsp 	}
 295 0cb74cf4 2018-07-08 stsp 	if (verify)
 296 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t*)h->large_offsets,
 297 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 298 5e6be232 2019-11-08 stsp 	remain -= p->nlargeobj * sizeof(*h->large_offsets);
 299 5e6be232 2019-11-08 stsp 	offset += p->nlargeobj * sizeof(*h->large_offsets);
 300 0ebaf008 2018-01-10 stsp 
 301 0a0a3048 2018-01-10 stsp checksum:
 302 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->trailer)) {
 303 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 304 0a0a3048 2018-01-10 stsp 		goto done;
 305 0a0a3048 2018-01-10 stsp 	}
 306 fc79a48d 2018-07-09 stsp 	if (p->map)
 307 fc79a48d 2018-07-09 stsp 		h->trailer =
 308 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
 309 fc79a48d 2018-07-09 stsp 	else {
 310 fc79a48d 2018-07-09 stsp 		h->trailer = malloc(sizeof(*h->trailer));
 311 fc79a48d 2018-07-09 stsp 		if (h->trailer == NULL) {
 312 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 313 fc79a48d 2018-07-09 stsp 			goto done;
 314 fc79a48d 2018-07-09 stsp 		}
 315 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->trailer, sizeof(*h->trailer));
 316 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 317 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 318 faaa1c0f 2018-09-15 stsp 		else if (n != sizeof(*h->trailer)) {
 319 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 320 fc79a48d 2018-07-09 stsp 			goto done;
 321 fc79a48d 2018-07-09 stsp 		}
 322 fc79a48d 2018-07-09 stsp 	}
 323 0cb74cf4 2018-07-08 stsp 	if (verify) {
 324 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
 325 0cb74cf4 2018-07-08 stsp 		SHA1Final(sha1, &ctx);
 326 0cb74cf4 2018-07-08 stsp 		if (memcmp(h->trailer->packidx_sha1, sha1,
 327 0cb74cf4 2018-07-08 stsp 		    SHA1_DIGEST_LENGTH) != 0)
 328 0cb74cf4 2018-07-08 stsp 			err = got_error(GOT_ERR_PACKIDX_CSUM);
 329 0cb74cf4 2018-07-08 stsp 	}
 330 0a0a3048 2018-01-10 stsp done:
 331 817c5a18 2018-09-09 stsp 	return err;
 332 817c5a18 2018-09-09 stsp }
 333 817c5a18 2018-09-09 stsp 
 334 817c5a18 2018-09-09 stsp const struct got_error *
 335 6d5a9006 2020-12-16 yzhong got_packidx_open(struct got_packidx **packidx,
 336 6d5a9006 2020-12-16 yzhong     int dir_fd, const char *relpath, int verify)
 337 817c5a18 2018-09-09 stsp {
 338 817c5a18 2018-09-09 stsp 	const struct got_error *err = NULL;
 339 1124fe40 2021-07-07 stsp 	struct got_packidx *p = NULL;
 340 1124fe40 2021-07-07 stsp 	char *pack_relpath;
 341 c3564dfa 2021-07-15 stsp 	struct stat idx_sb, pack_sb;
 342 817c5a18 2018-09-09 stsp 
 343 817c5a18 2018-09-09 stsp 	*packidx = NULL;
 344 1124fe40 2021-07-07 stsp 
 345 1124fe40 2021-07-07 stsp 	err = got_packidx_get_packfile_path(&pack_relpath, relpath);
 346 1124fe40 2021-07-07 stsp 	if (err)
 347 1124fe40 2021-07-07 stsp 		return err;
 348 1124fe40 2021-07-07 stsp 
 349 1124fe40 2021-07-07 stsp 	/*
 350 1124fe40 2021-07-07 stsp 	 * Ensure that a corresponding pack file exists.
 351 1124fe40 2021-07-07 stsp 	 * Some Git repositories have this problem. Git seems to ignore
 352 1124fe40 2021-07-07 stsp 	 * the existence of lonely pack index files but we do not.
 353 1124fe40 2021-07-07 stsp 	 */
 354 c3564dfa 2021-07-15 stsp 	if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
 355 1124fe40 2021-07-07 stsp 		if (errno == ENOENT) {
 356 1124fe40 2021-07-07 stsp 			err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
 357 1124fe40 2021-07-07 stsp 			    "%s", relpath);
 358 1124fe40 2021-07-07 stsp 		} else
 359 1124fe40 2021-07-07 stsp 			err = got_error_from_errno2("fstatat", pack_relpath);
 360 1124fe40 2021-07-07 stsp 		goto done;
 361 1124fe40 2021-07-07 stsp 	}
 362 817c5a18 2018-09-09 stsp 
 363 817c5a18 2018-09-09 stsp 	p = calloc(1, sizeof(*p));
 364 1124fe40 2021-07-07 stsp 	if (p == NULL) {
 365 1124fe40 2021-07-07 stsp 		err = got_error_from_errno("calloc");
 366 1124fe40 2021-07-07 stsp 		goto done;
 367 1124fe40 2021-07-07 stsp 	}
 368 817c5a18 2018-09-09 stsp 
 369 fc63f50d 2021-12-31 thomas 	p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 370 6772cf22 2019-08-28 hiltjo 	if (p->fd == -1) {
 371 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("openat", relpath);
 372 1124fe40 2021-07-07 stsp 		goto done;
 373 6772cf22 2019-08-28 hiltjo 	}
 374 817c5a18 2018-09-09 stsp 
 375 c3564dfa 2021-07-15 stsp 	if (fstat(p->fd, &idx_sb) != 0) {
 376 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("fstat", relpath);
 377 1124fe40 2021-07-07 stsp 		goto done;
 378 817c5a18 2018-09-09 stsp 	}
 379 c3564dfa 2021-07-15 stsp 	p->len = idx_sb.st_size;
 380 817c5a18 2018-09-09 stsp 	if (p->len < sizeof(p->hdr)) {
 381 817c5a18 2018-09-09 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 382 1124fe40 2021-07-07 stsp 		goto done;
 383 817c5a18 2018-09-09 stsp 	}
 384 817c5a18 2018-09-09 stsp 
 385 6d5a9006 2020-12-16 yzhong 	p->path_packidx = strdup(relpath);
 386 817c5a18 2018-09-09 stsp 	if (p->path_packidx == NULL) {
 387 638f9024 2019-05-13 stsp 		err = got_error_from_errno("strdup");
 388 817c5a18 2018-09-09 stsp 		goto done;
 389 817c5a18 2018-09-09 stsp 	}
 390 817c5a18 2018-09-09 stsp 
 391 817c5a18 2018-09-09 stsp #ifndef GOT_PACK_NO_MMAP
 392 817c5a18 2018-09-09 stsp 	p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
 393 3a11398b 2019-02-21 stsp 	if (p->map == MAP_FAILED) {
 394 3a11398b 2019-02-21 stsp 		if (errno != ENOMEM) {
 395 638f9024 2019-05-13 stsp 			err = got_error_from_errno("mmap");
 396 3a11398b 2019-02-21 stsp 			goto done;
 397 3a11398b 2019-02-21 stsp 		}
 398 817c5a18 2018-09-09 stsp 		p->map = NULL; /* fall back to read(2) */
 399 3a11398b 2019-02-21 stsp 	}
 400 817c5a18 2018-09-09 stsp #endif
 401 817c5a18 2018-09-09 stsp 
 402 c3564dfa 2021-07-15 stsp 	err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
 403 817c5a18 2018-09-09 stsp done:
 404 1124fe40 2021-07-07 stsp 	if (err) {
 405 1124fe40 2021-07-07 stsp 		if (p)
 406 1124fe40 2021-07-07 stsp 			got_packidx_close(p);
 407 1124fe40 2021-07-07 stsp 	} else
 408 0a0a3048 2018-01-10 stsp 		*packidx = p;
 409 1124fe40 2021-07-07 stsp 	free(pack_relpath);
 410 0a0a3048 2018-01-10 stsp 	return err;
 411 0a0a3048 2018-01-10 stsp }
 412 0a0a3048 2018-01-10 stsp 
 413 57b35b75 2018-06-22 stsp const struct got_error *
 414 6fd11751 2018-06-04 stsp got_packidx_close(struct got_packidx *packidx)
 415 0a0a3048 2018-01-10 stsp {
 416 57b35b75 2018-06-22 stsp 	const struct got_error *err = NULL;
 417 57b35b75 2018-06-22 stsp 
 418 6fd11751 2018-06-04 stsp 	free(packidx->path_packidx);
 419 fc79a48d 2018-07-09 stsp 	if (packidx->map) {
 420 57b35b75 2018-06-22 stsp 		if (munmap(packidx->map, packidx->len) == -1)
 421 638f9024 2019-05-13 stsp 			err = got_error_from_errno("munmap");
 422 fc79a48d 2018-07-09 stsp 	} else {
 423 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.magic);
 424 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.version);
 425 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.fanout_table);
 426 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.sorted_ids);
 427 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.crc32);
 428 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.offsets);
 429 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.large_offsets);
 430 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.trailer);
 431 57b35b75 2018-06-22 stsp 	}
 432 08578a35 2021-01-22 stsp 	if (close(packidx->fd) == -1 && err == NULL)
 433 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 434 f9c2e8e5 2022-02-13 thomas 	free(packidx->sorted_offsets);
 435 f9c2e8e5 2022-02-13 thomas 	free(packidx->sorted_large_offsets);
 436 0a0a3048 2018-01-10 stsp 	free(packidx);
 437 57b35b75 2018-06-22 stsp 
 438 57b35b75 2018-06-22 stsp 	return err;
 439 a1fd68d8 2018-01-12 stsp }
 440 509c9973 2021-04-10 stsp 
 441 509c9973 2021-04-10 stsp const struct got_error *
 442 aea75d87 2021-07-06 stsp got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
 443 509c9973 2021-04-10 stsp {
 444 509c9973 2021-04-10 stsp 	size_t size;
 445 509c9973 2021-04-10 stsp 
 446 509c9973 2021-04-10 stsp 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
 447 aea75d87 2021-07-06 stsp 	size = strlen(path_packidx) + 2;
 448 509c9973 2021-04-10 stsp 	if (size < GOT_PACKFILE_NAMELEN + 1)
 449 aea75d87 2021-07-06 stsp 		return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
 450 a1fd68d8 2018-01-12 stsp 
 451 509c9973 2021-04-10 stsp 	*path_packfile = malloc(size);
 452 509c9973 2021-04-10 stsp 	if (*path_packfile == NULL)
 453 509c9973 2021-04-10 stsp 		return got_error_from_errno("malloc");
 454 509c9973 2021-04-10 stsp 
 455 509c9973 2021-04-10 stsp 	/* Copy up to and excluding ".idx". */
 456 aea75d87 2021-07-06 stsp 	if (strlcpy(*path_packfile, path_packidx,
 457 509c9973 2021-04-10 stsp 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= 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 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
 461 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 462 509c9973 2021-04-10 stsp 
 463 509c9973 2021-04-10 stsp 	return NULL;
 464 509c9973 2021-04-10 stsp }
 465 509c9973 2021-04-10 stsp 
 466 02828bfd 2021-06-22 stsp off_t
 467 02828bfd 2021-06-22 stsp got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
 468 a1fd68d8 2018-01-12 stsp {
 469 78fb0967 2020-09-09 naddy 	uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
 470 a1fd68d8 2018-01-12 stsp 	if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 471 a1fd68d8 2018-01-12 stsp 		uint64_t loffset;
 472 a1fd68d8 2018-01-12 stsp 		idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 473 5e6be232 2019-11-08 stsp 		if (idx < 0 || idx >= packidx->nlargeobj ||
 474 6fd11751 2018-06-04 stsp 		    packidx->hdr.large_offsets == NULL)
 475 a1fd68d8 2018-01-12 stsp 			return -1;
 476 78fb0967 2020-09-09 naddy 		loffset = be64toh(packidx->hdr.large_offsets[idx]);
 477 a1fd68d8 2018-01-12 stsp 		return (loffset > INT64_MAX ? -1 : (off_t)loffset);
 478 a1fd68d8 2018-01-12 stsp 	}
 479 a1fd68d8 2018-01-12 stsp 	return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
 480 a1fd68d8 2018-01-12 stsp }
 481 a1fd68d8 2018-01-12 stsp 
 482 1510f469 2018-09-09 stsp int
 483 48b4f239 2021-12-31 thomas got_packidx_get_object_idx(struct got_packidx *packidx,
 484 48b4f239 2021-12-31 thomas     struct got_object_id *id)
 485 a1fd68d8 2018-01-12 stsp {
 486 00927983 2020-04-19 stsp 	u_int8_t id0 = id->sha1[0];
 487 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 488 40aeb19c 2018-06-22 stsp 	int left = 0, right = totobj - 1;
 489 a1fd68d8 2018-01-12 stsp 
 490 a1fd68d8 2018-01-12 stsp 	if (id0 > 0)
 491 78fb0967 2020-09-09 naddy 		left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 492 a1fd68d8 2018-01-12 stsp 
 493 40aeb19c 2018-06-22 stsp 	while (left <= right) {
 494 57b35b75 2018-06-22 stsp 		struct got_packidx_object_id *oid;
 495 40aeb19c 2018-06-22 stsp 		int i, cmp;
 496 a1fd68d8 2018-01-12 stsp 
 497 40aeb19c 2018-06-22 stsp 		i = ((left + right) / 2);
 498 40aeb19c 2018-06-22 stsp 		oid = &packidx->hdr.sorted_ids[i];
 499 00927983 2020-04-19 stsp 		cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 500 16dcbf91 2018-04-01 stsp 		if (cmp == 0)
 501 6c00b545 2018-01-17 stsp 			return i;
 502 40aeb19c 2018-06-22 stsp 		else if (cmp > 0)
 503 40aeb19c 2018-06-22 stsp 			left = i + 1;
 504 40aeb19c 2018-06-22 stsp 		else if (cmp < 0)
 505 40aeb19c 2018-06-22 stsp 			right = i - 1;
 506 a1fd68d8 2018-01-12 stsp 	}
 507 a1fd68d8 2018-01-12 stsp 
 508 a1fd68d8 2018-01-12 stsp 	return -1;
 509 f9c2e8e5 2022-02-13 thomas }
 510 f9c2e8e5 2022-02-13 thomas 
 511 f9c2e8e5 2022-02-13 thomas static int
 512 f9c2e8e5 2022-02-13 thomas offset_cmp(const void *pa, const void *pb)
 513 f9c2e8e5 2022-02-13 thomas {
 514 f9c2e8e5 2022-02-13 thomas 	const struct got_pack_offset_index *a, *b;
 515 f9c2e8e5 2022-02-13 thomas 
 516 f9c2e8e5 2022-02-13 thomas 	a = (const struct got_pack_offset_index *)pa;
 517 f9c2e8e5 2022-02-13 thomas 	b = (const struct got_pack_offset_index *)pb;
 518 f9c2e8e5 2022-02-13 thomas 
 519 f9c2e8e5 2022-02-13 thomas 	if (a->offset < b->offset)
 520 f9c2e8e5 2022-02-13 thomas 		return -1;
 521 f9c2e8e5 2022-02-13 thomas 	else if (a->offset > b->offset)
 522 f9c2e8e5 2022-02-13 thomas 		return 1;
 523 f9c2e8e5 2022-02-13 thomas 
 524 f9c2e8e5 2022-02-13 thomas 	return 0;
 525 876c234b 2018-09-10 stsp }
 526 876c234b 2018-09-10 stsp 
 527 f9c2e8e5 2022-02-13 thomas static int
 528 f9c2e8e5 2022-02-13 thomas large_offset_cmp(const void *pa, const void *pb)
 529 f9c2e8e5 2022-02-13 thomas {
 530 f9c2e8e5 2022-02-13 thomas 	const struct got_pack_large_offset_index *a, *b;
 531 f9c2e8e5 2022-02-13 thomas 
 532 f9c2e8e5 2022-02-13 thomas 	a = (const struct got_pack_large_offset_index *)pa;
 533 f9c2e8e5 2022-02-13 thomas 	b = (const struct got_pack_large_offset_index *)pb;
 534 f9c2e8e5 2022-02-13 thomas 
 535 f9c2e8e5 2022-02-13 thomas 	if (a->offset < b->offset)
 536 f9c2e8e5 2022-02-13 thomas 		return -1;
 537 f9c2e8e5 2022-02-13 thomas 	else if (a->offset > b->offset)
 538 f9c2e8e5 2022-02-13 thomas 		return 1;
 539 f9c2e8e5 2022-02-13 thomas 
 540 f9c2e8e5 2022-02-13 thomas 	return 0;
 541 f9c2e8e5 2022-02-13 thomas }
 542 f9c2e8e5 2022-02-13 thomas 
 543 f9c2e8e5 2022-02-13 thomas static const struct got_error *
 544 f9c2e8e5 2022-02-13 thomas build_offset_index(struct got_packidx *p)
 545 f9c2e8e5 2022-02-13 thomas {
 546 f9c2e8e5 2022-02-13 thomas 	uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
 547 f9c2e8e5 2022-02-13 thomas 	unsigned int i, j, k;
 548 f9c2e8e5 2022-02-13 thomas 
 549 f9c2e8e5 2022-02-13 thomas 	p->sorted_offsets = calloc(nobj - p->nlargeobj,
 550 f9c2e8e5 2022-02-13 thomas 	    sizeof(p->sorted_offsets[0]));
 551 f9c2e8e5 2022-02-13 thomas 	if (p->sorted_offsets == NULL)
 552 f9c2e8e5 2022-02-13 thomas 		return got_error_from_errno("calloc");
 553 f9c2e8e5 2022-02-13 thomas 
 554 f9c2e8e5 2022-02-13 thomas 	if (p->nlargeobj > 0) {
 555 f9c2e8e5 2022-02-13 thomas 		p->sorted_large_offsets = calloc(p->nlargeobj,
 556 f9c2e8e5 2022-02-13 thomas 		    sizeof(p->sorted_large_offsets[0]));
 557 f9c2e8e5 2022-02-13 thomas 		if (p->sorted_large_offsets == NULL)
 558 f9c2e8e5 2022-02-13 thomas 			return got_error_from_errno("calloc");
 559 f9c2e8e5 2022-02-13 thomas 	}
 560 f9c2e8e5 2022-02-13 thomas 
 561 f9c2e8e5 2022-02-13 thomas 	j = 0;
 562 f9c2e8e5 2022-02-13 thomas 	k = 0;
 563 f9c2e8e5 2022-02-13 thomas 	for (i = 0; i < nobj; i++) {
 564 f9c2e8e5 2022-02-13 thomas 		uint32_t offset = be32toh(p->hdr.offsets[i]);
 565 f9c2e8e5 2022-02-13 thomas 		if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 566 f9c2e8e5 2022-02-13 thomas 			uint64_t loffset;
 567 f9c2e8e5 2022-02-13 thomas 			uint32_t idx;
 568 f9c2e8e5 2022-02-13 thomas 			idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 569 f9c2e8e5 2022-02-13 thomas 			if (idx >= p->nlargeobj ||
 570 f9c2e8e5 2022-02-13 thomas 			    p->nlargeobj == 0 ||
 571 f9c2e8e5 2022-02-13 thomas 			    p->hdr.large_offsets == NULL)
 572 f9c2e8e5 2022-02-13 thomas 				return got_error(GOT_ERR_BAD_PACKIDX);
 573 f9c2e8e5 2022-02-13 thomas 			loffset = be64toh(p->hdr.large_offsets[idx]);
 574 f9c2e8e5 2022-02-13 thomas 			p->sorted_large_offsets[j].offset = loffset;
 575 f9c2e8e5 2022-02-13 thomas 			p->sorted_large_offsets[j].idx = i;
 576 f9c2e8e5 2022-02-13 thomas 			j++;
 577 f9c2e8e5 2022-02-13 thomas 		} else {
 578 f9c2e8e5 2022-02-13 thomas 			p->sorted_offsets[k].offset = offset;
 579 f9c2e8e5 2022-02-13 thomas 			p->sorted_offsets[k].idx = i;
 580 f9c2e8e5 2022-02-13 thomas 			k++;
 581 f9c2e8e5 2022-02-13 thomas 		}
 582 f9c2e8e5 2022-02-13 thomas 	}
 583 f9c2e8e5 2022-02-13 thomas 	if (j != p->nlargeobj || k != nobj - p->nlargeobj)
 584 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_PACKIDX);
 585 f9c2e8e5 2022-02-13 thomas 
 586 f9c2e8e5 2022-02-13 thomas 	qsort(p->sorted_offsets, nobj - p->nlargeobj,
 587 f9c2e8e5 2022-02-13 thomas 	    sizeof(p->sorted_offsets[0]), offset_cmp);
 588 f9c2e8e5 2022-02-13 thomas 
 589 f9c2e8e5 2022-02-13 thomas 	if (p->sorted_large_offsets)
 590 f9c2e8e5 2022-02-13 thomas 		qsort(p->sorted_large_offsets, p->nlargeobj,
 591 f9c2e8e5 2022-02-13 thomas 		    sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
 592 f9c2e8e5 2022-02-13 thomas 
 593 f9c2e8e5 2022-02-13 thomas 	return NULL;
 594 f9c2e8e5 2022-02-13 thomas }
 595 f9c2e8e5 2022-02-13 thomas 
 596 876c234b 2018-09-10 stsp const struct got_error *
 597 f9c2e8e5 2022-02-13 thomas got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
 598 f9c2e8e5 2022-02-13 thomas {
 599 f9c2e8e5 2022-02-13 thomas 	const struct got_error *err;
 600 f9c2e8e5 2022-02-13 thomas 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 601 f9c2e8e5 2022-02-13 thomas 	int i, left, right;
 602 f9c2e8e5 2022-02-13 thomas 
 603 f9c2e8e5 2022-02-13 thomas 	*idx = -1;
 604 f9c2e8e5 2022-02-13 thomas 
 605 f9c2e8e5 2022-02-13 thomas 	if (packidx->sorted_offsets == NULL) {
 606 f9c2e8e5 2022-02-13 thomas 		err = build_offset_index(packidx);
 607 f9c2e8e5 2022-02-13 thomas 		if (err)
 608 f9c2e8e5 2022-02-13 thomas 			return err;
 609 f9c2e8e5 2022-02-13 thomas 	}
 610 f9c2e8e5 2022-02-13 thomas 
 611 f9c2e8e5 2022-02-13 thomas 	if (offset >= 0x7fffffff) {
 612 f9c2e8e5 2022-02-13 thomas 		uint64_t lo;
 613 f9c2e8e5 2022-02-13 thomas 		left = 0, right = packidx->nlargeobj - 1;
 614 f9c2e8e5 2022-02-13 thomas 		while (left <= right) {
 615 f9c2e8e5 2022-02-13 thomas 			i = ((left + right) / 2);
 616 f9c2e8e5 2022-02-13 thomas 			lo = packidx->sorted_large_offsets[i].offset;
 617 f9c2e8e5 2022-02-13 thomas 			if (lo == offset) {
 618 f9c2e8e5 2022-02-13 thomas 				*idx = packidx->sorted_large_offsets[i].idx;
 619 f9c2e8e5 2022-02-13 thomas 				break;
 620 f9c2e8e5 2022-02-13 thomas 			} else if (offset > lo)
 621 f9c2e8e5 2022-02-13 thomas 				left = i + 1;
 622 f9c2e8e5 2022-02-13 thomas 			else if (offset < lo)
 623 f9c2e8e5 2022-02-13 thomas 				right = i - 1;
 624 f9c2e8e5 2022-02-13 thomas 		}
 625 f9c2e8e5 2022-02-13 thomas 	} else {
 626 f9c2e8e5 2022-02-13 thomas 		uint32_t o;
 627 f9c2e8e5 2022-02-13 thomas 		left = 0, right = totobj - packidx->nlargeobj - 1;
 628 f9c2e8e5 2022-02-13 thomas 		while (left <= right) {
 629 f9c2e8e5 2022-02-13 thomas 			i = ((left + right) / 2);
 630 f9c2e8e5 2022-02-13 thomas 			o = packidx->sorted_offsets[i].offset;
 631 f9c2e8e5 2022-02-13 thomas 			if (o == offset) {
 632 f9c2e8e5 2022-02-13 thomas 				*idx = packidx->sorted_offsets[i].idx;
 633 f9c2e8e5 2022-02-13 thomas 				break;
 634 f9c2e8e5 2022-02-13 thomas 			} else if (offset > o)
 635 f9c2e8e5 2022-02-13 thomas 				left = i + 1;
 636 f9c2e8e5 2022-02-13 thomas 			else if (offset < o)
 637 f9c2e8e5 2022-02-13 thomas 				right = i - 1;
 638 f9c2e8e5 2022-02-13 thomas 		}
 639 f9c2e8e5 2022-02-13 thomas 	}
 640 f9c2e8e5 2022-02-13 thomas 
 641 f9c2e8e5 2022-02-13 thomas 	return NULL;
 642 f9c2e8e5 2022-02-13 thomas }
 643 f9c2e8e5 2022-02-13 thomas 
 644 f9c2e8e5 2022-02-13 thomas const struct got_error *
 645 f9c2e8e5 2022-02-13 thomas got_packidx_get_object_id(struct got_object_id *id,
 646 f9c2e8e5 2022-02-13 thomas     struct got_packidx *packidx, int idx)
 647 f9c2e8e5 2022-02-13 thomas {
 648 f9c2e8e5 2022-02-13 thomas 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 649 f9c2e8e5 2022-02-13 thomas 	struct got_packidx_object_id *oid;
 650 f9c2e8e5 2022-02-13 thomas 
 651 f9c2e8e5 2022-02-13 thomas 	if (idx < 0 || idx >= totobj)
 652 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_NO_OBJ);
 653 f9c2e8e5 2022-02-13 thomas 
 654 f9c2e8e5 2022-02-13 thomas 	oid = &packidx->hdr.sorted_ids[idx];
 655 f9c2e8e5 2022-02-13 thomas 	memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 656 f9c2e8e5 2022-02-13 thomas 	return NULL;
 657 f9c2e8e5 2022-02-13 thomas }
 658 f9c2e8e5 2022-02-13 thomas 
 659 f9c2e8e5 2022-02-13 thomas const struct got_error *
 660 dd88155e 2019-06-29 stsp got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
 661 4277420a 2019-06-29 stsp     struct got_packidx *packidx, const char *id_str_prefix)
 662 e09a504c 2019-06-28 stsp {
 663 dd88155e 2019-06-29 stsp 	const struct got_error *err = NULL;
 664 4277420a 2019-06-29 stsp 	u_int8_t id0;
 665 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 666 4277420a 2019-06-29 stsp 	char hex[3];
 667 4277420a 2019-06-29 stsp 	size_t prefix_len = strlen(id_str_prefix);
 668 e09a504c 2019-06-28 stsp 	struct got_packidx_object_id *oid;
 669 ec138a87 2022-01-03 thomas 	uint32_t i = 0;
 670 e09a504c 2019-06-28 stsp 
 671 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(matched_ids);
 672 4277420a 2019-06-29 stsp 
 673 4277420a 2019-06-29 stsp 	if (prefix_len < 2)
 674 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 675 4277420a 2019-06-29 stsp 
 676 4277420a 2019-06-29 stsp 	hex[0] = id_str_prefix[0];
 677 4277420a 2019-06-29 stsp 	hex[1] = id_str_prefix[1];
 678 4277420a 2019-06-29 stsp 	hex[2] = '\0';
 679 4277420a 2019-06-29 stsp 	if (!got_parse_xdigit(&id0, hex))
 680 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 681 4277420a 2019-06-29 stsp 
 682 ec138a87 2022-01-03 thomas 	if (id0 > 0)
 683 ec138a87 2022-01-03 thomas 		i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 684 4277420a 2019-06-29 stsp 	oid = &packidx->hdr.sorted_ids[i];
 685 4277420a 2019-06-29 stsp 	while (i < totobj && oid->sha1[0] == id0) {
 686 4277420a 2019-06-29 stsp 		char id_str[SHA1_DIGEST_STRING_LENGTH];
 687 dd88155e 2019-06-29 stsp 		struct got_object_qid *qid;
 688 4277420a 2019-06-29 stsp 		int cmp;
 689 4277420a 2019-06-29 stsp 
 690 4277420a 2019-06-29 stsp 		if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
 691 4277420a 2019-06-29 stsp 		        return got_error(GOT_ERR_NO_SPACE);
 692 4277420a 2019-06-29 stsp 
 693 4277420a 2019-06-29 stsp 		cmp = strncmp(id_str, id_str_prefix, prefix_len);
 694 4277420a 2019-06-29 stsp 		if (cmp < 0) {
 695 4277420a 2019-06-29 stsp 			oid = &packidx->hdr.sorted_ids[++i];
 696 4277420a 2019-06-29 stsp 			continue;
 697 4277420a 2019-06-29 stsp 		} else if (cmp > 0)
 698 e09a504c 2019-06-28 stsp 			break;
 699 4277420a 2019-06-29 stsp 
 700 dd88155e 2019-06-29 stsp 		err = got_object_qid_alloc_partial(&qid);
 701 dd88155e 2019-06-29 stsp 		if (err)
 702 dd88155e 2019-06-29 stsp 			break;
 703 ec242592 2022-04-22 thomas 		memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 704 dbdddfee 2021-06-23 naddy 		STAILQ_INSERT_TAIL(matched_ids, qid, entry);
 705 4277420a 2019-06-29 stsp 
 706 4277420a 2019-06-29 stsp 		oid = &packidx->hdr.sorted_ids[++i];
 707 e09a504c 2019-06-28 stsp 	}
 708 e09a504c 2019-06-28 stsp 
 709 0adc7bcc 2019-06-29 stsp 	if (err)
 710 0adc7bcc 2019-06-29 stsp 		got_object_id_queue_free(matched_ids);
 711 68036464 2022-06-26 thomas 	return err;
 712 68036464 2022-06-26 thomas }
 713 68036464 2022-06-26 thomas 
 714 68036464 2022-06-26 thomas static void
 715 68036464 2022-06-26 thomas set_max_datasize(void)
 716 68036464 2022-06-26 thomas {
 717 68036464 2022-06-26 thomas 	struct rlimit rl;
 718 68036464 2022-06-26 thomas 
 719 68036464 2022-06-26 thomas 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
 720 68036464 2022-06-26 thomas 		return;
 721 68036464 2022-06-26 thomas 
 722 68036464 2022-06-26 thomas 	rl.rlim_cur = rl.rlim_max;
 723 68036464 2022-06-26 thomas 	setrlimit(RLIMIT_DATA, &rl);
 724 68036464 2022-06-26 thomas }
 725 68036464 2022-06-26 thomas 
 726 68036464 2022-06-26 thomas const struct got_error *
 727 68036464 2022-06-26 thomas got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
 728 68036464 2022-06-26 thomas {
 729 68036464 2022-06-26 thomas 	const struct got_error *err = NULL;
 730 68036464 2022-06-26 thomas 	int imsg_fds[2];
 731 68036464 2022-06-26 thomas 	pid_t pid;
 732 68036464 2022-06-26 thomas 	struct imsgbuf *ibuf;
 733 68036464 2022-06-26 thomas 
 734 68036464 2022-06-26 thomas 	ibuf = calloc(1, sizeof(*ibuf));
 735 68036464 2022-06-26 thomas 	if (ibuf == NULL)
 736 68036464 2022-06-26 thomas 		return got_error_from_errno("calloc");
 737 68036464 2022-06-26 thomas 
 738 68036464 2022-06-26 thomas 	pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
 739 68036464 2022-06-26 thomas 	if (pack->privsep_child == NULL) {
 740 68036464 2022-06-26 thomas 		err = got_error_from_errno("calloc");
 741 68036464 2022-06-26 thomas 		free(ibuf);
 742 68036464 2022-06-26 thomas 		return err;
 743 68036464 2022-06-26 thomas 	}
 744 68036464 2022-06-26 thomas 	pack->child_has_tempfiles = 0;
 745 68036464 2022-06-26 thomas 	pack->child_has_delta_outfd = 0;
 746 68036464 2022-06-26 thomas 
 747 68036464 2022-06-26 thomas 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
 748 68036464 2022-06-26 thomas 		err = got_error_from_errno("socketpair");
 749 68036464 2022-06-26 thomas 		goto done;
 750 68036464 2022-06-26 thomas 	}
 751 68036464 2022-06-26 thomas 
 752 68036464 2022-06-26 thomas 	pid = fork();
 753 68036464 2022-06-26 thomas 	if (pid == -1) {
 754 68036464 2022-06-26 thomas 		err = got_error_from_errno("fork");
 755 68036464 2022-06-26 thomas 		goto done;
 756 68036464 2022-06-26 thomas 	} else if (pid == 0) {
 757 68036464 2022-06-26 thomas 		set_max_datasize();
 758 68036464 2022-06-26 thomas 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
 759 68036464 2022-06-26 thomas 		    pack->path_packfile);
 760 68036464 2022-06-26 thomas 		/* not reached */
 761 68036464 2022-06-26 thomas 	}
 762 68036464 2022-06-26 thomas 
 763 68036464 2022-06-26 thomas 	if (close(imsg_fds[1]) == -1)
 764 68036464 2022-06-26 thomas 		return got_error_from_errno("close");
 765 68036464 2022-06-26 thomas 	pack->privsep_child->imsg_fd = imsg_fds[0];
 766 68036464 2022-06-26 thomas 	pack->privsep_child->pid = pid;
 767 68036464 2022-06-26 thomas 	imsg_init(ibuf, imsg_fds[0]);
 768 68036464 2022-06-26 thomas 	pack->privsep_child->ibuf = ibuf;
 769 68036464 2022-06-26 thomas 
 770 68036464 2022-06-26 thomas 	err = got_privsep_init_pack_child(ibuf, pack, packidx);
 771 68036464 2022-06-26 thomas 	if (err) {
 772 68036464 2022-06-26 thomas 		const struct got_error *child_err;
 773 68036464 2022-06-26 thomas 		err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 774 68036464 2022-06-26 thomas 		child_err = got_privsep_wait_for_child(
 775 68036464 2022-06-26 thomas 		    pack->privsep_child->pid);
 776 68036464 2022-06-26 thomas 		if (child_err && err == NULL)
 777 68036464 2022-06-26 thomas 			err = child_err;
 778 68036464 2022-06-26 thomas 	}
 779 68036464 2022-06-26 thomas done:
 780 68036464 2022-06-26 thomas 	if (err) {
 781 68036464 2022-06-26 thomas 		free(ibuf);
 782 68036464 2022-06-26 thomas 		free(pack->privsep_child);
 783 68036464 2022-06-26 thomas 		pack->privsep_child = NULL;
 784 68036464 2022-06-26 thomas 	}
 785 dd88155e 2019-06-29 stsp 	return err;
 786 e09a504c 2019-06-28 stsp }
 787 e09a504c 2019-06-28 stsp 
 788 b4f37570 2021-06-19 stsp static const struct got_error *
 789 b4f37570 2021-06-19 stsp pack_stop_privsep_child(struct got_pack *pack)
 790 876c234b 2018-09-10 stsp {
 791 96732e0b 2018-11-11 stsp 	const struct got_error *err = NULL;
 792 876c234b 2018-09-10 stsp 
 793 876c234b 2018-09-10 stsp 	if (pack->privsep_child == NULL)
 794 876c234b 2018-09-10 stsp 		return NULL;
 795 876c234b 2018-09-10 stsp 
 796 876c234b 2018-09-10 stsp 	err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 797 96732e0b 2018-11-11 stsp 	if (err)
 798 96732e0b 2018-11-11 stsp 		return err;
 799 96732e0b 2018-11-11 stsp 	err = got_privsep_wait_for_child(pack->privsep_child->pid);
 800 08578a35 2021-01-22 stsp 	if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL)
 801 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 802 cc2a8ef4 2021-06-19 tracey 	free(pack->privsep_child->ibuf);
 803 876c234b 2018-09-10 stsp 	free(pack->privsep_child);
 804 876c234b 2018-09-10 stsp 	pack->privsep_child = NULL;
 805 876c234b 2018-09-10 stsp 	return err;
 806 7e656b93 2018-03-17 stsp }
 807 7e656b93 2018-03-17 stsp 
 808 d7464085 2018-07-09 stsp const struct got_error *
 809 7e656b93 2018-03-17 stsp got_pack_close(struct got_pack *pack)
 810 7e656b93 2018-03-17 stsp {
 811 d7464085 2018-07-09 stsp 	const struct got_error *err = NULL;
 812 d7464085 2018-07-09 stsp 
 813 b4f37570 2021-06-19 stsp 	err = pack_stop_privsep_child(pack);
 814 876c234b 2018-09-10 stsp 	if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
 815 638f9024 2019-05-13 stsp 		err = got_error_from_errno("munmap");
 816 08578a35 2021-01-22 stsp 	if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
 817 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 818 8b2180d4 2018-04-26 stsp 	pack->fd = -1;
 819 4589e373 2018-03-17 stsp 	free(pack->path_packfile);
 820 4589e373 2018-03-17 stsp 	pack->path_packfile = NULL;
 821 4589e373 2018-03-17 stsp 	pack->filesize = 0;
 822 ab2f42e7 2019-11-10 stsp 	if (pack->delta_cache) {
 823 ab2f42e7 2019-11-10 stsp 		got_delta_cache_free(pack->delta_cache);
 824 ab2f42e7 2019-11-10 stsp 		pack->delta_cache = NULL;
 825 ab2f42e7 2019-11-10 stsp 	}
 826 7e656b93 2018-03-17 stsp 
 827 bfb5ee0b 2022-05-31 thomas 	/*
 828 bfb5ee0b 2022-05-31 thomas 	 * Leave accumfd and basefd alone. They are managed by the
 829 bfb5ee0b 2022-05-31 thomas 	 * repository layer and can be reused.
 830 bfb5ee0b 2022-05-31 thomas 	 */
 831 bfb5ee0b 2022-05-31 thomas 
 832 c7fe698a 2018-01-23 stsp 	return err;
 833 c7fe698a 2018-01-23 stsp }
 834 c7fe698a 2018-01-23 stsp 
 835 668a20f6 2020-03-18 stsp const struct got_error *
 836 668a20f6 2020-03-18 stsp got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
 837 d7464085 2018-07-09 stsp     struct got_pack *pack, off_t offset)
 838 a487c1d0 2018-01-14 stsp {
 839 a487c1d0 2018-01-14 stsp 	uint8_t t = 0;
 840 a487c1d0 2018-01-14 stsp 	uint64_t s = 0;
 841 a487c1d0 2018-01-14 stsp 	uint8_t sizeN;
 842 d7464085 2018-07-09 stsp 	size_t mapoff = 0;
 843 a487c1d0 2018-01-14 stsp 	int i = 0;
 844 d7464085 2018-07-09 stsp 
 845 d7464085 2018-07-09 stsp 	*len = 0;
 846 d7464085 2018-07-09 stsp 
 847 d7464085 2018-07-09 stsp 	if (offset >= pack->filesize)
 848 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 849 d7464085 2018-07-09 stsp 
 850 d7464085 2018-07-09 stsp 	if (pack->map) {
 851 d7464085 2018-07-09 stsp 		mapoff = (size_t)offset;
 852 d7464085 2018-07-09 stsp 	} else {
 853 d7464085 2018-07-09 stsp 		if (lseek(pack->fd, offset, SEEK_SET) == -1)
 854 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
 855 d7464085 2018-07-09 stsp 	}
 856 a487c1d0 2018-01-14 stsp 
 857 a1fd68d8 2018-01-12 stsp 	do {
 858 a1fd68d8 2018-01-12 stsp 		/* We do not support size values which don't fit in 64 bit. */
 859 a487c1d0 2018-01-14 stsp 		if (i > 9)
 860 eac8a741 2022-10-20 thomas 			return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
 861 eac8a741 2022-10-20 thomas 			    "packfile offset %llu", offset);
 862 a1fd68d8 2018-01-12 stsp 
 863 d7464085 2018-07-09 stsp 		if (pack->map) {
 864 1944573a 2022-01-10 thomas 			if (mapoff + sizeof(sizeN) >= pack->filesize)
 865 1944573a 2022-01-10 thomas 				return got_error(GOT_ERR_BAD_PACKFILE);
 866 d7464085 2018-07-09 stsp 			sizeN = *(pack->map + mapoff);
 867 d7464085 2018-07-09 stsp 			mapoff += sizeof(sizeN);
 868 d7464085 2018-07-09 stsp 		} else {
 869 d7464085 2018-07-09 stsp 			ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
 870 d7464085 2018-07-09 stsp 			if (n < 0)
 871 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 872 d7464085 2018-07-09 stsp 			if (n != sizeof(sizeN))
 873 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 874 d7464085 2018-07-09 stsp 		}
 875 d7464085 2018-07-09 stsp 		*len += sizeof(sizeN);
 876 8251fdbc 2018-01-12 stsp 
 877 a1fd68d8 2018-01-12 stsp 		if (i == 0) {
 878 a487c1d0 2018-01-14 stsp 			t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
 879 a1fd68d8 2018-01-12 stsp 			    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
 880 a487c1d0 2018-01-14 stsp 			s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
 881 a1fd68d8 2018-01-12 stsp 		} else {
 882 a1fd68d8 2018-01-12 stsp 			size_t shift = 4 + 7 * (i - 1);
 883 a487c1d0 2018-01-14 stsp 			s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
 884 a1fd68d8 2018-01-12 stsp 		}
 885 a1fd68d8 2018-01-12 stsp 		i++;
 886 a1fd68d8 2018-01-12 stsp 	} while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
 887 a1fd68d8 2018-01-12 stsp 
 888 a487c1d0 2018-01-14 stsp 	*type = t;
 889 a487c1d0 2018-01-14 stsp 	*size = s;
 890 a487c1d0 2018-01-14 stsp 	return NULL;
 891 0a0a3048 2018-01-10 stsp }
 892 c54542a0 2018-01-13 stsp 
 893 a1fd68d8 2018-01-12 stsp static const struct got_error *
 894 5f25cc85 2019-11-26 stsp open_plain_object(struct got_object **obj, struct got_object_id *id,
 895 5f25cc85 2019-11-26 stsp     uint8_t type, off_t offset, size_t size, int idx)
 896 6ccb713b 2018-01-19 stsp {
 897 6ccb713b 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
 898 6ccb713b 2018-01-19 stsp 	if (*obj == NULL)
 899 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 900 6ccb713b 2018-01-19 stsp 
 901 6ccb713b 2018-01-19 stsp 	(*obj)->type = type;
 902 6ccb713b 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
 903 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
 904 6ccb713b 2018-01-19 stsp 	(*obj)->hdrlen = 0;
 905 6ccb713b 2018-01-19 stsp 	(*obj)->size = size;
 906 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
 907 6ccb713b 2018-01-19 stsp 	(*obj)->pack_offset = offset;
 908 b107e67f 2018-01-19 stsp 
 909 b107e67f 2018-01-19 stsp 	return NULL;
 910 b107e67f 2018-01-19 stsp }
 911 b107e67f 2018-01-19 stsp 
 912 b107e67f 2018-01-19 stsp static const struct got_error *
 913 d7464085 2018-07-09 stsp parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
 914 d7464085 2018-07-09 stsp     off_t delta_offset)
 915 b107e67f 2018-01-19 stsp {
 916 b107e67f 2018-01-19 stsp 	int64_t o = 0;
 917 b107e67f 2018-01-19 stsp 	uint8_t offN;
 918 b107e67f 2018-01-19 stsp 	int i = 0;
 919 b107e67f 2018-01-19 stsp 
 920 a0de39f3 2019-08-09 stsp 	*offset = 0;
 921 d7464085 2018-07-09 stsp 	*len = 0;
 922 d7464085 2018-07-09 stsp 
 923 b107e67f 2018-01-19 stsp 	do {
 924 b107e67f 2018-01-19 stsp 		/* We do not support offset values which don't fit in 64 bit. */
 925 b107e67f 2018-01-19 stsp 		if (i > 8)
 926 b107e67f 2018-01-19 stsp 			return got_error(GOT_ERR_NO_SPACE);
 927 b107e67f 2018-01-19 stsp 
 928 d7464085 2018-07-09 stsp 		if (pack->map) {
 929 d7464085 2018-07-09 stsp 			size_t mapoff;
 930 d7464085 2018-07-09 stsp 			mapoff = (size_t)delta_offset + *len;
 931 1944573a 2022-01-10 thomas 			if (mapoff + sizeof(offN) >= pack->filesize)
 932 1944573a 2022-01-10 thomas 				return got_error(GOT_ERR_PACK_OFFSET);
 933 d7464085 2018-07-09 stsp 			offN = *(pack->map + mapoff);
 934 d7464085 2018-07-09 stsp 		} else {
 935 d7464085 2018-07-09 stsp 			ssize_t n;
 936 d7464085 2018-07-09 stsp 			n = read(pack->fd, &offN, sizeof(offN));
 937 d7464085 2018-07-09 stsp 			if (n < 0)
 938 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 939 d7464085 2018-07-09 stsp 			if (n != sizeof(offN))
 940 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 941 d7464085 2018-07-09 stsp 		}
 942 d7464085 2018-07-09 stsp 		*len += sizeof(offN);
 943 b107e67f 2018-01-19 stsp 
 944 b107e67f 2018-01-19 stsp 		if (i == 0)
 945 b107e67f 2018-01-19 stsp 			o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 946 b107e67f 2018-01-19 stsp 		else {
 947 cecc778e 2018-01-23 stsp 			o++;
 948 b107e67f 2018-01-19 stsp 			o <<= 7;
 949 cecc778e 2018-01-23 stsp 			o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 950 b107e67f 2018-01-19 stsp 		}
 951 b107e67f 2018-01-19 stsp 		i++;
 952 b107e67f 2018-01-19 stsp 	} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
 953 6ccb713b 2018-01-19 stsp 
 954 b107e67f 2018-01-19 stsp 	*offset = o;
 955 6ccb713b 2018-01-19 stsp 	return NULL;
 956 6ccb713b 2018-01-19 stsp }
 957 6ccb713b 2018-01-19 stsp 
 958 668a20f6 2020-03-18 stsp const struct got_error *
 959 48b4f239 2021-12-31 thomas got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
 960 48b4f239 2021-12-31 thomas     struct got_pack *pack, off_t offset, int tslen)
 961 b107e67f 2018-01-19 stsp {
 962 96f5e8b3 2018-01-23 stsp 	const struct got_error *err;
 963 b107e67f 2018-01-19 stsp 	int64_t negoffset;
 964 b107e67f 2018-01-19 stsp 	size_t negofflen;
 965 b107e67f 2018-01-19 stsp 
 966 d7464085 2018-07-09 stsp 	*len = 0;
 967 d7464085 2018-07-09 stsp 
 968 d7464085 2018-07-09 stsp 	err = parse_negative_offset(&negoffset, &negofflen, pack,
 969 d7464085 2018-07-09 stsp 	    offset + tslen);
 970 b107e67f 2018-01-19 stsp 	if (err)
 971 b107e67f 2018-01-19 stsp 		return err;
 972 b107e67f 2018-01-19 stsp 
 973 b107e67f 2018-01-19 stsp 	/* Compute the base object's offset (must be in the same pack file). */
 974 96f5e8b3 2018-01-23 stsp 	*base_offset = (offset - negoffset);
 975 96f5e8b3 2018-01-23 stsp 	if (*base_offset <= 0)
 976 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_BAD_PACKFILE);
 977 b107e67f 2018-01-19 stsp 
 978 d7464085 2018-07-09 stsp 	*len = negofflen;
 979 96f5e8b3 2018-01-23 stsp 	return NULL;
 980 96f5e8b3 2018-01-23 stsp }
 981 96f5e8b3 2018-01-23 stsp 
 982 0e22967e 2018-02-11 stsp static const struct got_error *
 983 42c69117 2019-11-10 stsp read_delta_data(uint8_t **delta_buf, size_t *delta_len,
 984 9249e7e3 2022-05-12 thomas     size_t *delta_compressed_len, size_t delta_data_offset,
 985 9249e7e3 2022-05-12 thomas     struct got_pack *pack)
 986 42c69117 2019-11-10 stsp {
 987 42c69117 2019-11-10 stsp 	const struct got_error *err = NULL;
 988 9249e7e3 2022-05-12 thomas 	size_t consumed = 0;
 989 42c69117 2019-11-10 stsp 
 990 42c69117 2019-11-10 stsp 	if (pack->map) {
 991 42c69117 2019-11-10 stsp 		if (delta_data_offset >= pack->filesize)
 992 42c69117 2019-11-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
 993 2e5a6fad 2020-03-18 stsp 		err = got_inflate_to_mem_mmap(delta_buf, delta_len,
 994 9249e7e3 2022-05-12 thomas 		    &consumed, NULL, pack->map, delta_data_offset,
 995 2e5a6fad 2020-03-18 stsp 		    pack->filesize - delta_data_offset);
 996 9249e7e3 2022-05-12 thomas 		if (err)
 997 9249e7e3 2022-05-12 thomas 			return err;
 998 42c69117 2019-11-10 stsp 	} else {
 999 42c69117 2019-11-10 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1000 42c69117 2019-11-10 stsp 			return got_error_from_errno("lseek");
1001 9249e7e3 2022-05-12 thomas 		err = got_inflate_to_mem_fd(delta_buf, delta_len,
1002 9249e7e3 2022-05-12 thomas 		    &consumed, NULL, 0, pack->fd);
1003 9249e7e3 2022-05-12 thomas 		if (err)
1004 9249e7e3 2022-05-12 thomas 			return err;
1005 42c69117 2019-11-10 stsp 	}
1006 9249e7e3 2022-05-12 thomas 
1007 9249e7e3 2022-05-12 thomas 	if (delta_compressed_len)
1008 9249e7e3 2022-05-12 thomas 		*delta_compressed_len = consumed;
1009 9249e7e3 2022-05-12 thomas 
1010 9249e7e3 2022-05-12 thomas 	return NULL;
1011 42c69117 2019-11-10 stsp }
1012 a3500804 2018-01-23 stsp 
1013 96f5e8b3 2018-01-23 stsp static const struct got_error *
1014 c336f889 2018-07-23 stsp add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1015 42c69117 2019-11-10 stsp     int delta_type, size_t delta_size, size_t delta_data_offset)
1016 bdd2fbb3 2018-02-11 stsp {
1017 bdd2fbb3 2018-02-11 stsp 	struct got_delta *delta;
1018 bdd2fbb3 2018-02-11 stsp 
1019 c336f889 2018-07-23 stsp 	delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1020 42c69117 2019-11-10 stsp 	    delta_data_offset);
1021 bdd2fbb3 2018-02-11 stsp 	if (delta == NULL)
1022 638f9024 2019-05-13 stsp 		return got_error_from_errno("got_delta_open");
1023 bdd2fbb3 2018-02-11 stsp 	/* delta is freed in got_object_close() */
1024 bdd2fbb3 2018-02-11 stsp 	deltas->nentries++;
1025 dbdddfee 2021-06-23 naddy 	STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1026 bdd2fbb3 2018-02-11 stsp 	return NULL;
1027 bdd2fbb3 2018-02-11 stsp }
1028 bdd2fbb3 2018-02-11 stsp 
1029 bdd2fbb3 2018-02-11 stsp static const struct got_error *
1030 6b9c9673 2018-01-23 stsp resolve_offset_delta(struct got_delta_chain *deltas,
1031 c8ecd499 2018-09-09 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1032 c8ecd499 2018-09-09 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1033 bdd2fbb3 2018-02-11 stsp 
1034 a3500804 2018-01-23 stsp {
1035 a3500804 2018-01-23 stsp 	const struct got_error *err;
1036 c3703302 2018-01-23 stsp 	off_t base_offset;
1037 c3703302 2018-01-23 stsp 	uint8_t base_type;
1038 c3703302 2018-01-23 stsp 	uint64_t base_size;
1039 c3703302 2018-01-23 stsp 	size_t base_tslen;
1040 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1041 42c69117 2019-11-10 stsp 	size_t consumed;
1042 a3500804 2018-01-23 stsp 
1043 668a20f6 2020-03-18 stsp 	err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1044 d7464085 2018-07-09 stsp 	    delta_offset, tslen);
1045 a3500804 2018-01-23 stsp 	if (err)
1046 a3500804 2018-01-23 stsp 		return err;
1047 a3500804 2018-01-23 stsp 
1048 d7464085 2018-07-09 stsp 	delta_data_offset = delta_offset + tslen + consumed;
1049 d7464085 2018-07-09 stsp 	if (delta_data_offset >= pack->filesize)
1050 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1051 a53d2f13 2018-03-17 stsp 
1052 d7464085 2018-07-09 stsp 	if (pack->map == NULL) {
1053 d7464085 2018-07-09 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1054 d7464085 2018-07-09 stsp 		if (delta_data_offset == -1)
1055 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
1056 d7464085 2018-07-09 stsp 	}
1057 bdd2fbb3 2018-02-11 stsp 
1058 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1059 42c69117 2019-11-10 stsp 	    delta_data_offset);
1060 bdd2fbb3 2018-02-11 stsp 	if (err)
1061 1a35c1bc 2019-05-22 stsp 		return err;
1062 bdd2fbb3 2018-02-11 stsp 
1063 c3703302 2018-01-23 stsp 	/* An offset delta must be in the same packfile. */
1064 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1065 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1066 b107e67f 2018-01-19 stsp 
1067 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1068 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1069 b107e67f 2018-01-19 stsp 	if (err)
1070 1a35c1bc 2019-05-22 stsp 		return err;
1071 b107e67f 2018-01-19 stsp 
1072 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1073 b0e2201a 2018-06-22 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1074 c3703302 2018-01-23 stsp }
1075 c4330eff 2021-06-22 stsp 
1076 c4330eff 2021-06-22 stsp const struct got_error *
1077 c4330eff 2021-06-22 stsp got_pack_parse_ref_delta(struct got_object_id *id,
1078 c4330eff 2021-06-22 stsp     struct got_pack *pack, off_t delta_offset, int tslen)
1079 c4330eff 2021-06-22 stsp {
1080 c4330eff 2021-06-22 stsp 	if (pack->map) {
1081 c4330eff 2021-06-22 stsp 		size_t mapoff = delta_offset + tslen;
1082 1944573a 2022-01-10 thomas 		if (mapoff + sizeof(*id) >= pack->filesize)
1083 1944573a 2022-01-10 thomas 			return got_error(GOT_ERR_PACK_OFFSET);
1084 c4330eff 2021-06-22 stsp 		memcpy(id, pack->map + mapoff, sizeof(*id));
1085 c4330eff 2021-06-22 stsp 	} else {
1086 c4330eff 2021-06-22 stsp 		ssize_t n;
1087 c4330eff 2021-06-22 stsp 		n = read(pack->fd, id, sizeof(*id));
1088 c4330eff 2021-06-22 stsp 		if (n < 0)
1089 c4330eff 2021-06-22 stsp 			return got_error_from_errno("read");
1090 c4330eff 2021-06-22 stsp 		if (n != sizeof(*id))
1091 c4330eff 2021-06-22 stsp 			return got_error(GOT_ERR_BAD_PACKFILE);
1092 c4330eff 2021-06-22 stsp 	}
1093 c3703302 2018-01-23 stsp 
1094 c4330eff 2021-06-22 stsp 	return NULL;
1095 c4330eff 2021-06-22 stsp }
1096 c4330eff 2021-06-22 stsp 
1097 c3703302 2018-01-23 stsp static const struct got_error *
1098 c8ecd499 2018-09-09 stsp resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1099 c8ecd499 2018-09-09 stsp     struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1100 c8ecd499 2018-09-09 stsp     size_t delta_size, unsigned int recursion)
1101 c3703302 2018-01-23 stsp {
1102 6b9c9673 2018-01-23 stsp 	const struct got_error *err;
1103 6b9c9673 2018-01-23 stsp 	struct got_object_id id;
1104 6b9c9673 2018-01-23 stsp 	int idx;
1105 6b9c9673 2018-01-23 stsp 	off_t base_offset;
1106 6b9c9673 2018-01-23 stsp 	uint8_t base_type;
1107 6b9c9673 2018-01-23 stsp 	uint64_t base_size;
1108 6b9c9673 2018-01-23 stsp 	size_t base_tslen;
1109 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1110 6b9c9673 2018-01-23 stsp 
1111 42c69117 2019-11-10 stsp 	if (delta_offset + tslen >= pack->filesize)
1112 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1113 a53d2f13 2018-03-17 stsp 
1114 c4330eff 2021-06-22 stsp 	err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1115 c4330eff 2021-06-22 stsp 	if (err)
1116 c4330eff 2021-06-22 stsp 		return err;
1117 d7464085 2018-07-09 stsp 	if (pack->map) {
1118 c4330eff 2021-06-22 stsp 		delta_data_offset = delta_offset + tslen + sizeof(id);
1119 d7464085 2018-07-09 stsp 	} else {
1120 e40b19ed 2020-01-06 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1121 e40b19ed 2020-01-06 stsp 		if (delta_data_offset == -1)
1122 e40b19ed 2020-01-06 stsp 			return got_error_from_errno("lseek");
1123 d7464085 2018-07-09 stsp 	}
1124 d7464085 2018-07-09 stsp 
1125 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1126 42c69117 2019-11-10 stsp 	    delta_data_offset);
1127 bdd2fbb3 2018-02-11 stsp 	if (err)
1128 1a35c1bc 2019-05-22 stsp 		return err;
1129 bdd2fbb3 2018-02-11 stsp 
1130 652b2703 2018-06-22 stsp 	/* Delta base must be in the same pack file. */
1131 1510f469 2018-09-09 stsp 	idx = got_packidx_get_object_idx(packidx, &id);
1132 1a35c1bc 2019-05-22 stsp 	if (idx == -1)
1133 668a20f6 2020-03-18 stsp 		return got_error(GOT_ERR_NO_OBJ);
1134 6b9c9673 2018-01-23 stsp 
1135 02828bfd 2021-06-22 stsp 	base_offset = got_packidx_get_object_offset(packidx, idx);
1136 e4a6dbc6 2022-07-24 thomas 	if (base_offset == -1)
1137 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1138 6b9c9673 2018-01-23 stsp 
1139 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1140 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1141 6b9c9673 2018-01-23 stsp 
1142 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1143 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1144 6b9c9673 2018-01-23 stsp 	if (err)
1145 1a35c1bc 2019-05-22 stsp 		return err;
1146 6b9c9673 2018-01-23 stsp 
1147 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1148 0c048b15 2018-04-27 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1149 6b9c9673 2018-01-23 stsp }
1150 6b9c9673 2018-01-23 stsp 
1151 668a20f6 2020-03-18 stsp const struct got_error *
1152 668a20f6 2020-03-18 stsp got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1153 668a20f6 2020-03-18 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1154 668a20f6 2020-03-18 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1155 6b9c9673 2018-01-23 stsp {
1156 c3703302 2018-01-23 stsp 	const struct got_error *err = NULL;
1157 c3703302 2018-01-23 stsp 
1158 5b7e13a7 2018-04-02 stsp 	if (--recursion == 0)
1159 5b7e13a7 2018-04-02 stsp 		return got_error(GOT_ERR_RECURSION);
1160 5b7e13a7 2018-04-02 stsp 
1161 c3703302 2018-01-23 stsp 	switch (delta_type) {
1162 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_COMMIT:
1163 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TREE:
1164 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_BLOB:
1165 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TAG:
1166 c3703302 2018-01-23 stsp 		/* Plain types are the final delta base. Recursion ends. */
1167 c336f889 2018-07-23 stsp 		err = add_delta(deltas, delta_offset, tslen, delta_type,
1168 42c69117 2019-11-10 stsp 		    delta_size, 0);
1169 4e8cda55 2018-01-19 stsp 		break;
1170 a3500804 2018-01-23 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1171 c8ecd499 2018-09-09 stsp 		err = resolve_offset_delta(deltas, packidx, pack,
1172 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1173 96f5e8b3 2018-01-23 stsp 		break;
1174 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1175 c8ecd499 2018-09-09 stsp 		err = resolve_ref_delta(deltas, packidx, pack,
1176 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1177 6b9c9673 2018-01-23 stsp 		break;
1178 4e8cda55 2018-01-19 stsp 	default:
1179 4810de4a 2018-04-01 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1180 4e8cda55 2018-01-19 stsp 	}
1181 96f5e8b3 2018-01-23 stsp 
1182 96f5e8b3 2018-01-23 stsp 	return err;
1183 96f5e8b3 2018-01-23 stsp }
1184 96f5e8b3 2018-01-23 stsp 
1185 96f5e8b3 2018-01-23 stsp static const struct got_error *
1186 a98c62b1 2018-09-09 stsp open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1187 a98c62b1 2018-09-09 stsp     struct got_pack *pack, struct got_object_id *id, off_t offset,
1188 c59b3346 2018-09-11 stsp     size_t tslen, int delta_type, size_t delta_size, int idx)
1189 96f5e8b3 2018-01-23 stsp {
1190 96f5e8b3 2018-01-23 stsp 	const struct got_error *err = NULL;
1191 96f5e8b3 2018-01-23 stsp 	int resolved_type;
1192 4e8cda55 2018-01-19 stsp 
1193 b107e67f 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
1194 b107e67f 2018-01-19 stsp 	if (*obj == NULL)
1195 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
1196 b107e67f 2018-01-19 stsp 
1197 96f5e8b3 2018-01-23 stsp 	(*obj)->flags = 0;
1198 b107e67f 2018-01-19 stsp 	(*obj)->hdrlen = 0;
1199 39e73dc9 2018-03-03 stsp 	(*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1200 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1201 cecc778e 2018-01-23 stsp 	(*obj)->pack_offset = offset + tslen;
1202 1a35c1bc 2019-05-22 stsp 
1203 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(&(*obj)->deltas.entries);
1204 1a35c1bc 2019-05-22 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1205 96f5e8b3 2018-01-23 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1206 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
1207 96f5e8b3 2018-01-23 stsp 
1208 668a20f6 2020-03-18 stsp 	err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1209 668a20f6 2020-03-18 stsp 	    offset, tslen, delta_type, delta_size,
1210 668a20f6 2020-03-18 stsp 	    GOT_DELTA_CHAIN_RECURSION_MAX);
1211 96f5e8b3 2018-01-23 stsp 	if (err)
1212 96f5e8b3 2018-01-23 stsp 		goto done;
1213 96f5e8b3 2018-01-23 stsp 
1214 96f5e8b3 2018-01-23 stsp 	err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1215 96f5e8b3 2018-01-23 stsp 	if (err)
1216 96f5e8b3 2018-01-23 stsp 		goto done;
1217 96f5e8b3 2018-01-23 stsp 	(*obj)->type = resolved_type;
1218 96f5e8b3 2018-01-23 stsp done:
1219 96f5e8b3 2018-01-23 stsp 	if (err) {
1220 96f5e8b3 2018-01-23 stsp 		got_object_close(*obj);
1221 96f5e8b3 2018-01-23 stsp 		*obj = NULL;
1222 96f5e8b3 2018-01-23 stsp 	}
1223 96f5e8b3 2018-01-23 stsp 	return err;
1224 b107e67f 2018-01-19 stsp }
1225 b107e67f 2018-01-19 stsp 
1226 2090a03d 2018-09-09 stsp const struct got_error *
1227 2090a03d 2018-09-09 stsp got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1228 6fd11751 2018-06-04 stsp     struct got_packidx *packidx, int idx, struct got_object_id *id)
1229 a1fd68d8 2018-01-12 stsp {
1230 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
1231 a1fd68d8 2018-01-12 stsp 	off_t offset;
1232 6c00b545 2018-01-17 stsp 	uint8_t type;
1233 6c00b545 2018-01-17 stsp 	uint64_t size;
1234 3ee5fc21 2018-01-17 stsp 	size_t tslen;
1235 a1fd68d8 2018-01-12 stsp 
1236 6c00b545 2018-01-17 stsp 	*obj = NULL;
1237 a1fd68d8 2018-01-12 stsp 
1238 02828bfd 2021-06-22 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1239 e4a6dbc6 2022-07-24 thomas 	if (offset == -1)
1240 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1241 a1fd68d8 2018-01-12 stsp 
1242 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1243 668a20f6 2020-03-18 stsp 	    pack, offset);
1244 a1fd68d8 2018-01-12 stsp 	if (err)
1245 35c73765 2018-09-09 stsp 		return err;
1246 a1fd68d8 2018-01-12 stsp 
1247 6c00b545 2018-01-17 stsp 	switch (type) {
1248 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
1249 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
1250 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
1251 d33fc9ef 2018-01-23 stsp 	case GOT_OBJ_TYPE_TAG:
1252 5f25cc85 2019-11-26 stsp 		err = open_plain_object(obj, id, type, offset + tslen,
1253 5f25cc85 2019-11-26 stsp 		    size, idx);
1254 6c00b545 2018-01-17 stsp 		break;
1255 b107e67f 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1256 a48db7e5 2018-01-23 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1257 a98c62b1 2018-09-09 stsp 		err = open_delta_object(obj, packidx, pack, id, offset,
1258 c59b3346 2018-09-11 stsp 		    tslen, type, size, idx);
1259 b107e67f 2018-01-19 stsp 		break;
1260 6c00b545 2018-01-17 stsp 	default:
1261 4810de4a 2018-04-01 stsp 		err = got_error(GOT_ERR_OBJ_TYPE);
1262 35c73765 2018-09-09 stsp 		break;
1263 35c73765 2018-09-09 stsp 	}
1264 35c73765 2018-09-09 stsp 
1265 3ee5fc21 2018-01-17 stsp 	return err;
1266 3ee5fc21 2018-01-17 stsp }
1267 efd2a263 2018-01-19 stsp 
1268 d582f26c 2020-03-18 stsp const struct got_error *
1269 48b4f239 2021-12-31 thomas got_pack_get_delta_chain_max_size(uint64_t *max_size,
1270 48b4f239 2021-12-31 thomas     struct got_delta_chain *deltas, struct got_pack *pack)
1271 22484865 2018-03-13 stsp {
1272 22484865 2018-03-13 stsp 	struct got_delta *delta;
1273 22484865 2018-03-13 stsp 	uint64_t base_size = 0, result_size = 0;
1274 22484865 2018-03-13 stsp 
1275 22484865 2018-03-13 stsp 	*max_size = 0;
1276 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1277 22484865 2018-03-13 stsp 		/* Plain object types are the delta base. */
1278 22484865 2018-03-13 stsp 		if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1279 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TREE &&
1280 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_BLOB &&
1281 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TAG) {
1282 22484865 2018-03-13 stsp 			const struct got_error *err;
1283 723ed5ad 2022-10-18 thomas 			uint8_t *delta_buf = NULL;
1284 42c69117 2019-11-10 stsp 			size_t delta_len;
1285 ab2f42e7 2019-11-10 stsp 			int cached = 1;
1286 42c69117 2019-11-10 stsp 
1287 723ed5ad 2022-10-18 thomas 			if (pack->delta_cache) {
1288 723ed5ad 2022-10-18 thomas 				got_delta_cache_get(&delta_buf, &delta_len,
1289 723ed5ad 2022-10-18 thomas 				    pack->delta_cache, delta->data_offset);
1290 723ed5ad 2022-10-18 thomas 			}
1291 ab2f42e7 2019-11-10 stsp 			if (delta_buf == NULL) {
1292 ab2f42e7 2019-11-10 stsp 				cached = 0;
1293 ab2f42e7 2019-11-10 stsp 				err = read_delta_data(&delta_buf, &delta_len,
1294 9249e7e3 2022-05-12 thomas 				    NULL, delta->data_offset, pack);
1295 ab2f42e7 2019-11-10 stsp 				if (err)
1296 ab2f42e7 2019-11-10 stsp 					return err;
1297 723ed5ad 2022-10-18 thomas 			}
1298 723ed5ad 2022-10-18 thomas 			if (pack->delta_cache && !cached) {
1299 ab2f42e7 2019-11-10 stsp 				err = got_delta_cache_add(pack->delta_cache,
1300 ab2f42e7 2019-11-10 stsp 				    delta->data_offset, delta_buf, delta_len);
1301 ab2f42e7 2019-11-10 stsp 				if (err == NULL)
1302 ab2f42e7 2019-11-10 stsp 					cached = 1;
1303 ab2f42e7 2019-11-10 stsp 				else if (err->code != GOT_ERR_NO_SPACE) {
1304 ab2f42e7 2019-11-10 stsp 					free(delta_buf);
1305 ab2f42e7 2019-11-10 stsp 					return err;
1306 ab2f42e7 2019-11-10 stsp 				}
1307 ab2f42e7 2019-11-10 stsp 			}
1308 a53d2f13 2018-03-17 stsp 			err = got_delta_get_sizes(&base_size, &result_size,
1309 42c69117 2019-11-10 stsp 			    delta_buf, delta_len);
1310 ab2f42e7 2019-11-10 stsp 			if (!cached)
1311 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1312 22484865 2018-03-13 stsp 			if (err)
1313 22484865 2018-03-13 stsp 				return err;
1314 22484865 2018-03-13 stsp 		} else
1315 22484865 2018-03-13 stsp 			base_size = delta->size;
1316 22484865 2018-03-13 stsp 		if (base_size > *max_size)
1317 22484865 2018-03-13 stsp 			*max_size = base_size;
1318 22484865 2018-03-13 stsp 		if (result_size > *max_size)
1319 22484865 2018-03-13 stsp 			*max_size = result_size;
1320 22484865 2018-03-13 stsp 	}
1321 bd1223b9 2018-03-14 stsp 
1322 9feb4ff2 2018-03-14 stsp 	return NULL;
1323 ac544f8c 2019-01-13 stsp }
1324 ac544f8c 2019-01-13 stsp 
1325 ac544f8c 2019-01-13 stsp const struct got_error *
1326 42c69117 2019-11-10 stsp got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1327 42c69117 2019-11-10 stsp     struct got_pack *pack)
1328 ac544f8c 2019-01-13 stsp {
1329 85a703fa 2019-01-13 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1330 85a703fa 2019-01-13 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1331 85a703fa 2019-01-13 stsp 
1332 d582f26c 2020-03-18 stsp 	return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1333 22484865 2018-03-13 stsp }
1334 22484865 2018-03-13 stsp 
1335 668a20f6 2020-03-18 stsp const struct got_error *
1336 4788f1ce 2020-03-18 stsp got_pack_dump_delta_chain_to_file(size_t *result_size,
1337 4788f1ce 2020-03-18 stsp     struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1338 4788f1ce 2020-03-18 stsp     FILE *base_file, FILE *accum_file)
1339 efd2a263 2018-01-19 stsp {
1340 efd2a263 2018-01-19 stsp 	const struct got_error *err = NULL;
1341 6691714a 2018-01-23 stsp 	struct got_delta *delta;
1342 723ed5ad 2022-10-18 thomas 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1343 210941d5 2022-05-31 thomas 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1344 210941d5 2022-05-31 thomas 	/* We process small enough files entirely in memory for speed. */
1345 210941d5 2022-05-31 thomas 	const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1346 210941d5 2022-05-31 thomas 	uint64_t max_size = 0;
1347 6691714a 2018-01-23 stsp 	int n = 0;
1348 b29656e2 2018-03-16 stsp 
1349 b29656e2 2018-03-16 stsp 	*result_size = 0;
1350 3ee5fc21 2018-01-17 stsp 
1351 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1352 6691714a 2018-01-23 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1353 efd2a263 2018-01-19 stsp 
1354 210941d5 2022-05-31 thomas 	if (fseeko(base_file, 0L, SEEK_SET) == -1)
1355 210941d5 2022-05-31 thomas 		return got_error_from_errno("fseeko");
1356 210941d5 2022-05-31 thomas 	if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1357 210941d5 2022-05-31 thomas 		return got_error_from_errno("fseeko");
1358 efd2a263 2018-01-19 stsp 
1359 6691714a 2018-01-23 stsp 	/* Deltas are ordered in ascending order. */
1360 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1361 723ed5ad 2022-10-18 thomas 		uint8_t *delta_buf = NULL;
1362 210941d5 2022-05-31 thomas 		uint64_t base_size, result_size = 0;
1363 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1364 a6b158cc 2018-02-11 stsp 		if (n == 0) {
1365 34fca9c3 2018-11-11 stsp 			size_t mapoff;
1366 0c048b15 2018-04-27 stsp 			off_t delta_data_offset;
1367 9db65d41 2018-03-14 stsp 
1368 a6b158cc 2018-02-11 stsp 			/* Plain object types are the delta base. */
1369 a6b158cc 2018-02-11 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1370 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1371 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1372 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1373 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1374 72eb3431 2018-04-01 stsp 				goto done;
1375 72eb3431 2018-04-01 stsp 			}
1376 72eb3431 2018-04-01 stsp 
1377 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1378 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1379 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1380 0c048b15 2018-04-27 stsp 				goto done;
1381 0c048b15 2018-04-27 stsp 			}
1382 d7464085 2018-07-09 stsp 			if (pack->map == NULL) {
1383 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1384 d7464085 2018-07-09 stsp 				    == -1) {
1385 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1386 d7464085 2018-07-09 stsp 					goto done;
1387 d7464085 2018-07-09 stsp 				}
1388 bdd2fbb3 2018-02-11 stsp 			}
1389 210941d5 2022-05-31 thomas 			if (delta->size > max_size)
1390 210941d5 2022-05-31 thomas 				max_size = delta->size;
1391 210941d5 2022-05-31 thomas 			if (max_size > max_bufsize) {
1392 d7464085 2018-07-09 stsp 				if (pack->map) {
1393 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1394 d7464085 2018-07-09 stsp 					err = got_inflate_to_file_mmap(
1395 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->map,
1396 4788f1ce 2020-03-18 stsp 					    mapoff, pack->filesize - mapoff,
1397 4788f1ce 2020-03-18 stsp 					    base_file);
1398 d7464085 2018-07-09 stsp 				} else
1399 34fca9c3 2018-11-11 stsp 					err = got_inflate_to_file_fd(
1400 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->fd,
1401 4788f1ce 2020-03-18 stsp 					    base_file);
1402 d7464085 2018-07-09 stsp 			} else {
1403 210941d5 2022-05-31 thomas 				accum_buf = malloc(max_size);
1404 210941d5 2022-05-31 thomas 				if (accum_buf == NULL) {
1405 210941d5 2022-05-31 thomas 					err = got_error_from_errno("malloc");
1406 210941d5 2022-05-31 thomas 					goto done;
1407 210941d5 2022-05-31 thomas 				}
1408 210941d5 2022-05-31 thomas 				accum_bufsz = max_size;
1409 d7464085 2018-07-09 stsp 				if (pack->map) {
1410 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1411 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_mmap(&base_buf,
1412 2e5a6fad 2020-03-18 stsp 					    &base_bufsz, NULL, NULL,
1413 2e5a6fad 2020-03-18 stsp 					    pack->map, mapoff,
1414 d7464085 2018-07-09 stsp 					    pack->filesize - mapoff);
1415 d7464085 2018-07-09 stsp 				} else
1416 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_fd(&base_buf,
1417 55fdd257 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, max_size,
1418 55fdd257 2020-03-18 stsp 					    pack->fd);
1419 8628c62d 2018-03-15 stsp 			}
1420 a6b158cc 2018-02-11 stsp 			if (err)
1421 a6b158cc 2018-02-11 stsp 				goto done;
1422 a6b158cc 2018-02-11 stsp 			n++;
1423 210941d5 2022-05-31 thomas 			if (base_buf == NULL)
1424 8628c62d 2018-03-15 stsp 				rewind(base_file);
1425 a6b158cc 2018-02-11 stsp 			continue;
1426 9db65d41 2018-03-14 stsp 		}
1427 885d3e02 2018-01-27 stsp 
1428 723ed5ad 2022-10-18 thomas 		if (pack->delta_cache) {
1429 723ed5ad 2022-10-18 thomas 			got_delta_cache_get(&delta_buf, &delta_len,
1430 723ed5ad 2022-10-18 thomas 			    pack->delta_cache, delta->data_offset);
1431 723ed5ad 2022-10-18 thomas 		}
1432 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1433 ab2f42e7 2019-11-10 stsp 			cached = 0;
1434 9249e7e3 2022-05-12 thomas 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1435 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1436 ab2f42e7 2019-11-10 stsp 			if (err)
1437 ab2f42e7 2019-11-10 stsp 				goto done;
1438 723ed5ad 2022-10-18 thomas 		}
1439 723ed5ad 2022-10-18 thomas 		if (pack->delta_cache && !cached) {
1440 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1441 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1442 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1443 ab2f42e7 2019-11-10 stsp 				cached = 1;
1444 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1445 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1446 ab2f42e7 2019-11-10 stsp 				goto done;
1447 ab2f42e7 2019-11-10 stsp 			}
1448 ab2f42e7 2019-11-10 stsp 		}
1449 210941d5 2022-05-31 thomas 
1450 210941d5 2022-05-31 thomas 		err = got_delta_get_sizes(&base_size, &result_size,
1451 210941d5 2022-05-31 thomas 		    delta_buf, delta_len);
1452 210941d5 2022-05-31 thomas 		if (err)
1453 210941d5 2022-05-31 thomas 			goto done;
1454 210941d5 2022-05-31 thomas 		if (base_size > max_size)
1455 210941d5 2022-05-31 thomas 			max_size = base_size;
1456 210941d5 2022-05-31 thomas 		if (result_size > max_size)
1457 210941d5 2022-05-31 thomas 			max_size = result_size;
1458 210941d5 2022-05-31 thomas 
1459 210941d5 2022-05-31 thomas 		if (base_buf && max_size > max_bufsize) {
1460 210941d5 2022-05-31 thomas 			/* Switch from buffers to temporary files. */
1461 210941d5 2022-05-31 thomas 			size_t w = fwrite(base_buf, 1, base_bufsz,
1462 210941d5 2022-05-31 thomas 			    base_file);
1463 210941d5 2022-05-31 thomas 			if (w != base_bufsz) {
1464 210941d5 2022-05-31 thomas 				err = got_ferror(outfile, GOT_ERR_IO);
1465 210941d5 2022-05-31 thomas 				goto done;
1466 210941d5 2022-05-31 thomas 			}
1467 210941d5 2022-05-31 thomas 			free(base_buf);
1468 210941d5 2022-05-31 thomas 			base_buf = NULL;
1469 210941d5 2022-05-31 thomas 			free(accum_buf);
1470 210941d5 2022-05-31 thomas 			accum_buf = NULL;
1471 210941d5 2022-05-31 thomas 		}
1472 210941d5 2022-05-31 thomas 
1473 210941d5 2022-05-31 thomas 		if (base_buf && max_size > base_bufsz) {
1474 210941d5 2022-05-31 thomas 			uint8_t *p = realloc(base_buf, max_size);
1475 210941d5 2022-05-31 thomas 			if (p == NULL) {
1476 210941d5 2022-05-31 thomas 				err = got_error_from_errno("realloc");
1477 210941d5 2022-05-31 thomas 				goto done;
1478 210941d5 2022-05-31 thomas 			}
1479 210941d5 2022-05-31 thomas 			base_buf = p;
1480 210941d5 2022-05-31 thomas 			base_bufsz = max_size;
1481 210941d5 2022-05-31 thomas 		}
1482 210941d5 2022-05-31 thomas 
1483 210941d5 2022-05-31 thomas 		if (accum_buf && max_size > accum_bufsz) {
1484 210941d5 2022-05-31 thomas 			uint8_t *p = realloc(accum_buf, max_size);
1485 210941d5 2022-05-31 thomas 			if (p == NULL) {
1486 210941d5 2022-05-31 thomas 				err = got_error_from_errno("realloc");
1487 210941d5 2022-05-31 thomas 				goto done;
1488 210941d5 2022-05-31 thomas 			}
1489 210941d5 2022-05-31 thomas 			accum_buf = p;
1490 210941d5 2022-05-31 thomas 			accum_bufsz = max_size;
1491 210941d5 2022-05-31 thomas 		}
1492 210941d5 2022-05-31 thomas 
1493 8628c62d 2018-03-15 stsp 		if (base_buf) {
1494 34fca9c3 2018-11-11 stsp 			err = got_delta_apply_in_mem(base_buf, base_bufsz,
1495 42c69117 2019-11-10 stsp 			    delta_buf, delta_len, accum_buf,
1496 34fca9c3 2018-11-11 stsp 			    &accum_size, max_size);
1497 8628c62d 2018-03-15 stsp 			n++;
1498 8628c62d 2018-03-15 stsp 		} else {
1499 42c69117 2019-11-10 stsp 			err = got_delta_apply(base_file, delta_buf,
1500 42c69117 2019-11-10 stsp 			    delta_len,
1501 8628c62d 2018-03-15 stsp 			    /* Final delta application writes to output file. */
1502 b29656e2 2018-03-16 stsp 			    ++n < deltas->nentries ? accum_file : outfile,
1503 b29656e2 2018-03-16 stsp 			    &accum_size);
1504 8628c62d 2018-03-15 stsp 		}
1505 ab2f42e7 2019-11-10 stsp 		if (!cached)
1506 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1507 6691714a 2018-01-23 stsp 		if (err)
1508 6691714a 2018-01-23 stsp 			goto done;
1509 6691714a 2018-01-23 stsp 
1510 710bb5ca 2018-01-23 stsp 		if (n < deltas->nentries) {
1511 6691714a 2018-01-23 stsp 			/* Accumulated delta becomes the new base. */
1512 8628c62d 2018-03-15 stsp 			if (base_buf) {
1513 8628c62d 2018-03-15 stsp 				uint8_t *tmp = accum_buf;
1514 210941d5 2022-05-31 thomas 				size_t tmp_size = accum_bufsz;
1515 8628c62d 2018-03-15 stsp 				accum_buf = base_buf;
1516 210941d5 2022-05-31 thomas 				accum_bufsz = base_bufsz;
1517 8628c62d 2018-03-15 stsp 				base_buf = tmp;
1518 210941d5 2022-05-31 thomas 				base_bufsz = tmp_size;
1519 8628c62d 2018-03-15 stsp 			} else {
1520 8628c62d 2018-03-15 stsp 				FILE *tmp = accum_file;
1521 8628c62d 2018-03-15 stsp 				accum_file = base_file;
1522 8628c62d 2018-03-15 stsp 				base_file = tmp;
1523 8628c62d 2018-03-15 stsp 				rewind(base_file);
1524 8628c62d 2018-03-15 stsp 				rewind(accum_file);
1525 8628c62d 2018-03-15 stsp 			}
1526 6691714a 2018-01-23 stsp 		}
1527 6691714a 2018-01-23 stsp 	}
1528 6691714a 2018-01-23 stsp 
1529 6691714a 2018-01-23 stsp done:
1530 8628c62d 2018-03-15 stsp 	free(base_buf);
1531 8628c62d 2018-03-15 stsp 	if (accum_buf) {
1532 8628c62d 2018-03-15 stsp 		size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1533 8628c62d 2018-03-15 stsp 		free(accum_buf);
1534 8628c62d 2018-03-15 stsp 		if (len != accum_size)
1535 673702af 2018-07-23 stsp 			err = got_ferror(outfile, GOT_ERR_IO);
1536 8628c62d 2018-03-15 stsp 	}
1537 6691714a 2018-01-23 stsp 	rewind(outfile);
1538 b29656e2 2018-03-16 stsp 	if (err == NULL)
1539 b29656e2 2018-03-16 stsp 		*result_size = accum_size;
1540 e0ab43e7 2018-03-16 stsp 	return err;
1541 e0ab43e7 2018-03-16 stsp }
1542 e0ab43e7 2018-03-16 stsp 
1543 668a20f6 2020-03-18 stsp const struct got_error *
1544 668a20f6 2020-03-18 stsp got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1545 48095039 2018-09-09 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1546 e0ab43e7 2018-03-16 stsp {
1547 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1548 e0ab43e7 2018-03-16 stsp 	struct got_delta *delta;
1549 723ed5ad 2022-10-18 thomas 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1550 6c85883b 2022-05-31 thomas 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1551 6c85883b 2022-05-31 thomas 	uint64_t max_size = 0;
1552 e0ab43e7 2018-03-16 stsp 	int n = 0;
1553 e0ab43e7 2018-03-16 stsp 
1554 e0ab43e7 2018-03-16 stsp 	*outbuf = NULL;
1555 e0ab43e7 2018-03-16 stsp 	*outlen = 0;
1556 e0ab43e7 2018-03-16 stsp 
1557 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1558 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1559 e0ab43e7 2018-03-16 stsp 
1560 e0ab43e7 2018-03-16 stsp 	/* Deltas are ordered in ascending order. */
1561 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1562 723ed5ad 2022-10-18 thomas 		uint8_t *delta_buf = NULL;
1563 6c85883b 2022-05-31 thomas 		uint64_t base_size, result_size = 0;
1564 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1565 e0ab43e7 2018-03-16 stsp 		if (n == 0) {
1566 0c048b15 2018-04-27 stsp 			size_t delta_data_offset;
1567 e0ab43e7 2018-03-16 stsp 
1568 e0ab43e7 2018-03-16 stsp 			/* Plain object types are the delta base. */
1569 e0ab43e7 2018-03-16 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1570 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1571 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1572 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1573 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1574 72eb3431 2018-04-01 stsp 				goto done;
1575 72eb3431 2018-04-01 stsp 			}
1576 72eb3431 2018-04-01 stsp 
1577 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1578 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1579 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1580 0c048b15 2018-04-27 stsp 				goto done;
1581 0c048b15 2018-04-27 stsp 			}
1582 6c85883b 2022-05-31 thomas 
1583 6c85883b 2022-05-31 thomas 			if (delta->size > max_size)
1584 6c85883b 2022-05-31 thomas 				max_size = delta->size;
1585 6c85883b 2022-05-31 thomas 
1586 d7464085 2018-07-09 stsp 			if (pack->map) {
1587 d7464085 2018-07-09 stsp 				size_t mapoff = (size_t)delta_data_offset;
1588 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_mmap(&base_buf,
1589 2e5a6fad 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, pack->map,
1590 2e5a6fad 2020-03-18 stsp 				    mapoff, pack->filesize - mapoff);
1591 d7464085 2018-07-09 stsp 			} else {
1592 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1593 d7464085 2018-07-09 stsp 				    == -1) {
1594 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1595 d7464085 2018-07-09 stsp 					goto done;
1596 d7464085 2018-07-09 stsp 				}
1597 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_fd(&base_buf,
1598 55fdd257 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, max_size,
1599 55fdd257 2020-03-18 stsp 				    pack->fd);
1600 e0ab43e7 2018-03-16 stsp 			}
1601 d7464085 2018-07-09 stsp 			if (err)
1602 d7464085 2018-07-09 stsp 				goto done;
1603 e0ab43e7 2018-03-16 stsp 			n++;
1604 e0ab43e7 2018-03-16 stsp 			continue;
1605 e0ab43e7 2018-03-16 stsp 		}
1606 e0ab43e7 2018-03-16 stsp 
1607 723ed5ad 2022-10-18 thomas 		if (pack->delta_cache) {
1608 723ed5ad 2022-10-18 thomas 			got_delta_cache_get(&delta_buf, &delta_len,
1609 723ed5ad 2022-10-18 thomas 			    pack->delta_cache, delta->data_offset);
1610 723ed5ad 2022-10-18 thomas 		}
1611 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1612 ab2f42e7 2019-11-10 stsp 			cached = 0;
1613 9249e7e3 2022-05-12 thomas 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1614 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1615 ab2f42e7 2019-11-10 stsp 			if (err)
1616 ab2f42e7 2019-11-10 stsp 				goto done;
1617 723ed5ad 2022-10-18 thomas 		}
1618 723ed5ad 2022-10-18 thomas 		if (pack->delta_cache && !cached) {
1619 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1620 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1621 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1622 ab2f42e7 2019-11-10 stsp 				cached = 1;
1623 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1624 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1625 ab2f42e7 2019-11-10 stsp 				goto done;
1626 ab2f42e7 2019-11-10 stsp 			}
1627 ab2f42e7 2019-11-10 stsp 		}
1628 6c85883b 2022-05-31 thomas 
1629 6c85883b 2022-05-31 thomas 		err = got_delta_get_sizes(&base_size, &result_size,
1630 6c85883b 2022-05-31 thomas 		    delta_buf, delta_len);
1631 6c85883b 2022-05-31 thomas 		if (err)
1632 6c85883b 2022-05-31 thomas 			goto done;
1633 6c85883b 2022-05-31 thomas 		if (base_size > max_size)
1634 6c85883b 2022-05-31 thomas 			max_size = base_size;
1635 6c85883b 2022-05-31 thomas 		if (result_size > max_size)
1636 6c85883b 2022-05-31 thomas 			max_size = result_size;
1637 6c85883b 2022-05-31 thomas 
1638 6c85883b 2022-05-31 thomas 		if (max_size > base_bufsz) {
1639 6c85883b 2022-05-31 thomas 			uint8_t *p = realloc(base_buf, max_size);
1640 6c85883b 2022-05-31 thomas 			if (p == NULL) {
1641 6c85883b 2022-05-31 thomas 				err = got_error_from_errno("realloc");
1642 6c85883b 2022-05-31 thomas 				goto done;
1643 6c85883b 2022-05-31 thomas 			}
1644 6c85883b 2022-05-31 thomas 			base_buf = p;
1645 6c85883b 2022-05-31 thomas 			base_bufsz = max_size;
1646 6c85883b 2022-05-31 thomas 		}
1647 6c85883b 2022-05-31 thomas 
1648 6c85883b 2022-05-31 thomas 		if (max_size > accum_bufsz) {
1649 6c85883b 2022-05-31 thomas 			uint8_t *p = realloc(accum_buf, max_size);
1650 6c85883b 2022-05-31 thomas 			if (p == NULL) {
1651 6c85883b 2022-05-31 thomas 				err = got_error_from_errno("realloc");
1652 6c85883b 2022-05-31 thomas 				goto done;
1653 6c85883b 2022-05-31 thomas 			}
1654 6c85883b 2022-05-31 thomas 			accum_buf = p;
1655 6c85883b 2022-05-31 thomas 			accum_bufsz = max_size;
1656 6c85883b 2022-05-31 thomas 		}
1657 6c85883b 2022-05-31 thomas 
1658 34fca9c3 2018-11-11 stsp 		err = got_delta_apply_in_mem(base_buf, base_bufsz,
1659 42c69117 2019-11-10 stsp 		    delta_buf, delta_len, accum_buf,
1660 34fca9c3 2018-11-11 stsp 		    &accum_size, max_size);
1661 ab2f42e7 2019-11-10 stsp 		if (!cached)
1662 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1663 e0ab43e7 2018-03-16 stsp 		n++;
1664 e0ab43e7 2018-03-16 stsp 		if (err)
1665 e0ab43e7 2018-03-16 stsp 			goto done;
1666 e0ab43e7 2018-03-16 stsp 
1667 e0ab43e7 2018-03-16 stsp 		if (n < deltas->nentries) {
1668 e0ab43e7 2018-03-16 stsp 			/* Accumulated delta becomes the new base. */
1669 e0ab43e7 2018-03-16 stsp 			uint8_t *tmp = accum_buf;
1670 6c85883b 2022-05-31 thomas 			size_t tmp_size = accum_bufsz;
1671 e0ab43e7 2018-03-16 stsp 			accum_buf = base_buf;
1672 6c85883b 2022-05-31 thomas 			accum_bufsz = base_bufsz;
1673 e0ab43e7 2018-03-16 stsp 			base_buf = tmp;
1674 6c85883b 2022-05-31 thomas 			base_bufsz = tmp_size;
1675 e0ab43e7 2018-03-16 stsp 		}
1676 e0ab43e7 2018-03-16 stsp 	}
1677 e0ab43e7 2018-03-16 stsp 
1678 e0ab43e7 2018-03-16 stsp done:
1679 e0ab43e7 2018-03-16 stsp 	free(base_buf);
1680 e0ab43e7 2018-03-16 stsp 	if (err) {
1681 e0ab43e7 2018-03-16 stsp 		free(accum_buf);
1682 e0ab43e7 2018-03-16 stsp 		*outbuf = NULL;
1683 e0ab43e7 2018-03-16 stsp 		*outlen = 0;
1684 e0ab43e7 2018-03-16 stsp 	} else {
1685 e0ab43e7 2018-03-16 stsp 		*outbuf = accum_buf;
1686 e0ab43e7 2018-03-16 stsp 		*outlen = accum_size;
1687 e0ab43e7 2018-03-16 stsp 	}
1688 efd2a263 2018-01-19 stsp 	return err;
1689 efd2a263 2018-01-19 stsp }
1690 efd2a263 2018-01-19 stsp 
1691 3ee5fc21 2018-01-17 stsp const struct got_error *
1692 24140570 2018-09-09 stsp got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1693 3840f4c9 2018-09-12 stsp     FILE *outfile, FILE *base_file, FILE *accum_file)
1694 3ee5fc21 2018-01-17 stsp {
1695 3ee5fc21 2018-01-17 stsp 	const struct got_error *err = NULL;
1696 3ee5fc21 2018-01-17 stsp 
1697 3ee5fc21 2018-01-17 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1698 3ee5fc21 2018-01-17 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1699 2ce68b2f 2018-09-09 stsp 
1700 ef2bccd9 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1701 24140570 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1702 24140570 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1703 72eb3431 2018-04-01 stsp 
1704 d7464085 2018-07-09 stsp 		if (pack->map) {
1705 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1706 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1707 4788f1ce 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff,
1708 4788f1ce 2020-03-18 stsp 			    outfile);
1709 d7464085 2018-07-09 stsp 		} else {
1710 24140570 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1711 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1712 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1713 4788f1ce 2020-03-18 stsp 			    pack->fd, outfile);
1714 d7464085 2018-07-09 stsp 		}
1715 040bf4a1 2018-04-01 stsp 	} else
1716 4788f1ce 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_file(&obj->size,
1717 4788f1ce 2020-03-18 stsp 		    &obj->deltas, pack, outfile, base_file, accum_file);
1718 24140570 2018-09-09 stsp 
1719 a1fd68d8 2018-01-12 stsp 	return err;
1720 a1fd68d8 2018-01-12 stsp }
1721 e0ab43e7 2018-03-16 stsp 
1722 e0ab43e7 2018-03-16 stsp const struct got_error *
1723 e0ab43e7 2018-03-16 stsp got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1724 7e212e3d 2018-09-09 stsp     struct got_object *obj, struct got_pack *pack)
1725 e0ab43e7 2018-03-16 stsp {
1726 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1727 e0ab43e7 2018-03-16 stsp 
1728 e0ab43e7 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1729 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1730 72eb3431 2018-04-01 stsp 
1731 48095039 2018-09-09 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1732 7e212e3d 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1733 7e212e3d 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1734 d7464085 2018-07-09 stsp 		if (pack->map) {
1735 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1736 2e5a6fad 2020-03-18 stsp 			err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1737 2e5a6fad 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff);
1738 d7464085 2018-07-09 stsp 		} else {
1739 7e212e3d 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1740 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1741 1e87a3c3 2020-03-18 stsp 			err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1742 55fdd257 2020-03-18 stsp 			    obj->size, pack->fd);
1743 e0ab43e7 2018-03-16 stsp 		}
1744 e0ab43e7 2018-03-16 stsp 	} else
1745 668a20f6 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1746 668a20f6 2020-03-18 stsp 		    pack);
1747 7e212e3d 2018-09-09 stsp 
1748 e0ab43e7 2018-03-16 stsp 	return err;
1749 e0ab43e7 2018-03-16 stsp }
1750 f9c2e8e5 2022-02-13 thomas 
1751 9249e7e3 2022-05-12 thomas static const struct got_error *
1752 9249e7e3 2022-05-12 thomas read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1753 9249e7e3 2022-05-12 thomas     size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1754 9249e7e3 2022-05-12 thomas     off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1755 9249e7e3 2022-05-12 thomas {
1756 9249e7e3 2022-05-12 thomas 	const struct got_error *err = NULL;
1757 9249e7e3 2022-05-12 thomas 
1758 9249e7e3 2022-05-12 thomas 	/* Validate decompression and obtain the decompressed size. */
1759 9249e7e3 2022-05-12 thomas 	err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1760 9249e7e3 2022-05-12 thomas 	    delta_data_offset, pack);
1761 9249e7e3 2022-05-12 thomas 	if (err)
1762 9249e7e3 2022-05-12 thomas 		return err;
1763 9249e7e3 2022-05-12 thomas 
1764 9249e7e3 2022-05-12 thomas 	/* Read delta base/result sizes from head of delta stream. */
1765 9249e7e3 2022-05-12 thomas 	err = got_delta_get_sizes(base_size, result_size,
1766 9249e7e3 2022-05-12 thomas 	    *delta_buf, *delta_len);
1767 9249e7e3 2022-05-12 thomas 	if (err)
1768 9249e7e3 2022-05-12 thomas 		goto done;
1769 9249e7e3 2022-05-12 thomas 
1770 9249e7e3 2022-05-12 thomas 	/* Discard decompressed delta and read it again in compressed form. */
1771 9249e7e3 2022-05-12 thomas 	free(*delta_buf);
1772 9249e7e3 2022-05-12 thomas 	*delta_buf = malloc(*delta_len_compressed);
1773 9249e7e3 2022-05-12 thomas 	if (*delta_buf == NULL) {
1774 9249e7e3 2022-05-12 thomas 		err = got_error_from_errno("malloc");
1775 9249e7e3 2022-05-12 thomas 		goto done;
1776 9249e7e3 2022-05-12 thomas 	}
1777 9249e7e3 2022-05-12 thomas 	if (pack->map) {
1778 9249e7e3 2022-05-12 thomas 		if (delta_data_offset >= pack->filesize)
1779 9249e7e3 2022-05-12 thomas 			err = got_error(GOT_ERR_PACK_OFFSET);
1780 9249e7e3 2022-05-12 thomas 		memcpy(*delta_buf, pack->map + delta_data_offset,
1781 9249e7e3 2022-05-12 thomas 		    *delta_len_compressed);
1782 9249e7e3 2022-05-12 thomas 	} else {
1783 9249e7e3 2022-05-12 thomas 		ssize_t n;
1784 9249e7e3 2022-05-12 thomas 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1785 9249e7e3 2022-05-12 thomas 			err = got_error_from_errno("lseek");
1786 9249e7e3 2022-05-12 thomas 			goto done;
1787 9249e7e3 2022-05-12 thomas 		}
1788 9249e7e3 2022-05-12 thomas 		n = read(pack->fd, *delta_buf, *delta_len_compressed);
1789 9249e7e3 2022-05-12 thomas 		if (n < 0) {
1790 9249e7e3 2022-05-12 thomas 			err = got_error_from_errno("read");
1791 9249e7e3 2022-05-12 thomas 			goto done;
1792 9249e7e3 2022-05-12 thomas 		} else if (n != *delta_len_compressed) {
1793 9249e7e3 2022-05-12 thomas 			err = got_error(GOT_ERR_IO);
1794 9249e7e3 2022-05-12 thomas 			goto done;
1795 9249e7e3 2022-05-12 thomas 		}
1796 9249e7e3 2022-05-12 thomas 	}
1797 9249e7e3 2022-05-12 thomas done:
1798 9249e7e3 2022-05-12 thomas 	if (err) {
1799 9249e7e3 2022-05-12 thomas 		free(*delta_buf);
1800 9249e7e3 2022-05-12 thomas 		*delta_buf = NULL;
1801 9249e7e3 2022-05-12 thomas 		*delta_len = 0;
1802 9249e7e3 2022-05-12 thomas 		*delta_len_compressed = 0;
1803 9249e7e3 2022-05-12 thomas 		*base_size = 0;
1804 9249e7e3 2022-05-12 thomas 		*result_size = 0;
1805 9249e7e3 2022-05-12 thomas 	}
1806 9249e7e3 2022-05-12 thomas 	return err;
1807 9249e7e3 2022-05-12 thomas }
1808 9249e7e3 2022-05-12 thomas 
1809 f9c2e8e5 2022-02-13 thomas const struct got_error *
1810 f9c2e8e5 2022-02-13 thomas got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1811 9249e7e3 2022-05-12 thomas     size_t *delta_compressed_size, off_t *delta_offset, off_t *base_offset,
1812 9249e7e3 2022-05-12 thomas     struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1813 9249e7e3 2022-05-12 thomas     struct got_pack *pack, struct got_packidx *packidx, int idx)
1814 f9c2e8e5 2022-02-13 thomas {
1815 f9c2e8e5 2022-02-13 thomas 	const struct got_error *err = NULL;
1816 f9c2e8e5 2022-02-13 thomas 	off_t offset;
1817 f9c2e8e5 2022-02-13 thomas 	uint8_t type;
1818 f9c2e8e5 2022-02-13 thomas 	uint64_t size;
1819 f9c2e8e5 2022-02-13 thomas 	size_t tslen, delta_hdrlen;
1820 9249e7e3 2022-05-12 thomas 	off_t delta_data_offset;
1821 f9c2e8e5 2022-02-13 thomas 
1822 f9c2e8e5 2022-02-13 thomas 	*delta_buf = NULL;
1823 f9c2e8e5 2022-02-13 thomas 	*delta_size = 0;
1824 9249e7e3 2022-05-12 thomas 	*delta_compressed_size = 0;
1825 f9c2e8e5 2022-02-13 thomas 	*delta_offset = 0;
1826 f9c2e8e5 2022-02-13 thomas 	*base_offset = 0;
1827 f9c2e8e5 2022-02-13 thomas 	*base_size = 0;
1828 f9c2e8e5 2022-02-13 thomas 	*result_size = 0;
1829 f9c2e8e5 2022-02-13 thomas 
1830 f9c2e8e5 2022-02-13 thomas 	offset = got_packidx_get_object_offset(packidx, idx);
1831 e4a6dbc6 2022-07-24 thomas 	if (offset == -1)
1832 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_PACKIDX);
1833 f9c2e8e5 2022-02-13 thomas 
1834 f9c2e8e5 2022-02-13 thomas 	if (offset >= pack->filesize)
1835 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_PACK_OFFSET);
1836 f9c2e8e5 2022-02-13 thomas 
1837 f9c2e8e5 2022-02-13 thomas 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1838 f9c2e8e5 2022-02-13 thomas 	    pack, offset);
1839 f9c2e8e5 2022-02-13 thomas 	if (err)
1840 f9c2e8e5 2022-02-13 thomas 		return err;
1841 f9c2e8e5 2022-02-13 thomas 
1842 f9c2e8e5 2022-02-13 thomas 	if (tslen + size < tslen || offset + size < size ||
1843 f9c2e8e5 2022-02-13 thomas 	    tslen + offset < tslen)
1844 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_PACK_OFFSET);
1845 f9c2e8e5 2022-02-13 thomas 
1846 f9c2e8e5 2022-02-13 thomas 	switch (type) {
1847 f9c2e8e5 2022-02-13 thomas 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1848 f9c2e8e5 2022-02-13 thomas 		err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1849 f9c2e8e5 2022-02-13 thomas 		    pack, offset, tslen);
1850 f9c2e8e5 2022-02-13 thomas 		if (err)
1851 f9c2e8e5 2022-02-13 thomas 			return err;
1852 f9c2e8e5 2022-02-13 thomas 		break;
1853 f9c2e8e5 2022-02-13 thomas 	case GOT_OBJ_TYPE_REF_DELTA:
1854 f9c2e8e5 2022-02-13 thomas 		err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1855 f9c2e8e5 2022-02-13 thomas 		if (err)
1856 f9c2e8e5 2022-02-13 thomas 			return err;
1857 f9c2e8e5 2022-02-13 thomas 		delta_hdrlen = SHA1_DIGEST_LENGTH;
1858 f9c2e8e5 2022-02-13 thomas 		break;
1859 f9c2e8e5 2022-02-13 thomas 	default:
1860 f9c2e8e5 2022-02-13 thomas 		return got_error_fmt(GOT_ERR_OBJ_TYPE,
1861 e4a6dbc6 2022-07-24 thomas 		    "non-delta object type %d found at offset %lld",
1862 e4a6dbc6 2022-07-24 thomas 		    type, (long long)offset);
1863 f9c2e8e5 2022-02-13 thomas 	}
1864 f9c2e8e5 2022-02-13 thomas 
1865 f9c2e8e5 2022-02-13 thomas 	if (tslen + delta_hdrlen < delta_hdrlen ||
1866 f9c2e8e5 2022-02-13 thomas 	    offset + delta_hdrlen < delta_hdrlen)
1867 f9c2e8e5 2022-02-13 thomas 		return got_error(GOT_ERR_BAD_DELTA);
1868 f9c2e8e5 2022-02-13 thomas 
1869 9249e7e3 2022-05-12 thomas 	delta_data_offset = offset + tslen + delta_hdrlen;
1870 9249e7e3 2022-05-12 thomas 	err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1871 9249e7e3 2022-05-12 thomas 	    base_size, result_size, delta_data_offset, pack, packidx);
1872 f9c2e8e5 2022-02-13 thomas 	if (err)
1873 f9c2e8e5 2022-02-13 thomas 		return err;
1874 f9c2e8e5 2022-02-13 thomas 
1875 f9c2e8e5 2022-02-13 thomas 	if (*delta_size != size) {
1876 f9c2e8e5 2022-02-13 thomas 		err = got_error(GOT_ERR_BAD_DELTA);
1877 f9c2e8e5 2022-02-13 thomas 		goto done;
1878 f9c2e8e5 2022-02-13 thomas 	}
1879 f9c2e8e5 2022-02-13 thomas 
1880 f9c2e8e5 2022-02-13 thomas 	*delta_offset = offset;
1881 f9c2e8e5 2022-02-13 thomas done:
1882 f9c2e8e5 2022-02-13 thomas 	if (err) {
1883 f9c2e8e5 2022-02-13 thomas 		free(*delta_buf);
1884 f9c2e8e5 2022-02-13 thomas 		*delta_buf = NULL;
1885 9249e7e3 2022-05-12 thomas 		*delta_size = 0;
1886 9249e7e3 2022-05-12 thomas 		*delta_compressed_size = 0;
1887 9249e7e3 2022-05-12 thomas 		*delta_offset = 0;
1888 9249e7e3 2022-05-12 thomas 		*base_offset = 0;
1889 9249e7e3 2022-05-12 thomas 		*base_size = 0;
1890 9249e7e3 2022-05-12 thomas 		*result_size = 0;
1891 f9c2e8e5 2022-02-13 thomas 	}
1892 f9c2e8e5 2022-02-13 thomas 	return err;
1893 f9c2e8e5 2022-02-13 thomas }