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 a1fd68d8 2018-01-12 stsp #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 3d589bee 2022-06-25 stsp #include <sys/resource.h>
  23 3d589bee 2022-06-25 stsp #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 0a0a3048 2018-01-10 stsp #include <sha1.h>
  33 0a0a3048 2018-01-10 stsp #include <endian.h>
  34 81a12da5 2020-09-09 naddy #include <unistd.h>
  35 a1fd68d8 2018-01-12 stsp #include <zlib.h>
  36 876c234b 2018-09-10 stsp #include <imsg.h>
  37 0a0a3048 2018-01-10 stsp 
  38 0a0a3048 2018-01-10 stsp #include "got_error.h"
  39 a1fd68d8 2018-01-12 stsp #include "got_object.h"
  40 324d37e7 2019-05-11 stsp #include "got_path.h"
  41 0a0a3048 2018-01-10 stsp 
  42 718b3ab0 2018-03-17 stsp #include "got_lib_sha1.h"
  43 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
  44 ab2f42e7 2019-11-10 stsp #include "got_lib_delta_cache.h"
  45 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
  46 718b3ab0 2018-03-17 stsp #include "got_lib_object.h"
  47 dd88155e 2019-06-29 stsp #include "got_lib_object_parse.h"
  48 876c234b 2018-09-10 stsp #include "got_lib_privsep.h"
  49 15a94983 2018-12-23 stsp #include "got_lib_pack.h"
  50 79b11c62 2018-03-09 stsp 
  51 79b11c62 2018-03-09 stsp #ifndef nitems
  52 79b11c62 2018-03-09 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  53 79b11c62 2018-03-09 stsp #endif
  54 1411938b 2018-02-12 stsp 
  55 a1fd68d8 2018-01-12 stsp #ifndef MIN
  56 a1fd68d8 2018-01-12 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  57 a1fd68d8 2018-01-12 stsp #endif
  58 a1fd68d8 2018-01-12 stsp 
  59 0a0a3048 2018-01-10 stsp static const struct got_error *
  60 0a0a3048 2018-01-10 stsp verify_fanout_table(uint32_t *fanout_table)
  61 0a0a3048 2018-01-10 stsp {
  62 0a0a3048 2018-01-10 stsp 	int i;
  63 0a0a3048 2018-01-10 stsp 
  64 0a0a3048 2018-01-10 stsp 	for (i = 0; i < 0xff - 1; i++) {
  65 a1fd68d8 2018-01-12 stsp 		if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
  66 0a0a3048 2018-01-10 stsp 			return got_error(GOT_ERR_BAD_PACKIDX);
  67 0a0a3048 2018-01-10 stsp 	}
  68 0a0a3048 2018-01-10 stsp 
  69 0a0a3048 2018-01-10 stsp 	return NULL;
  70 0a0a3048 2018-01-10 stsp }
  71 0a0a3048 2018-01-10 stsp 
  72 1510f469 2018-09-09 stsp const struct got_error *
  73 c3564dfa 2021-07-15 stsp got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
  74 0a0a3048 2018-01-10 stsp {
  75 0a0a3048 2018-01-10 stsp 	const struct got_error *err = NULL;
  76 817c5a18 2018-09-09 stsp 	struct got_packidx_v2_hdr *h;
  77 0ebaf008 2018-01-10 stsp 	SHA1_CTX ctx;
  78 0ebaf008 2018-01-10 stsp 	uint8_t sha1[SHA1_DIGEST_LENGTH];
  79 817c5a18 2018-09-09 stsp 	size_t nobj, len_fanout, len_ids, offset, remain;
  80 817c5a18 2018-09-09 stsp 	ssize_t n;
  81 5e6be232 2019-11-08 stsp 	int i;
  82 0a0a3048 2018-01-10 stsp 
  83 0ebaf008 2018-01-10 stsp 	SHA1Init(&ctx);
  84 0ebaf008 2018-01-10 stsp 
  85 57b35b75 2018-06-22 stsp 	h = &p->hdr;
  86 57b35b75 2018-06-22 stsp 	offset = 0;
  87 57b35b75 2018-06-22 stsp 	remain = p->len;
  88 0a0a3048 2018-01-10 stsp 
  89 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->magic)) {
  90 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
  91 0a0a3048 2018-01-10 stsp 		goto done;
  92 0a0a3048 2018-01-10 stsp 	}
  93 fc79a48d 2018-07-09 stsp 	if (p->map)
  94 fc79a48d 2018-07-09 stsp 		h->magic = (uint32_t *)(p->map + offset);
  95 fc79a48d 2018-07-09 stsp 	else {
  96 fc79a48d 2018-07-09 stsp 		h->magic = malloc(sizeof(*h->magic));
  97 fc79a48d 2018-07-09 stsp 		if (h->magic == NULL) {
  98 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
  99 fc79a48d 2018-07-09 stsp 			goto done;
 100 fc79a48d 2018-07-09 stsp 		}
 101 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->magic, sizeof(*h->magic));
 102 b1317e77 2019-09-22 stsp 		if (n < 0) {
 103 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 104 b1317e77 2019-09-22 stsp 			goto done;
 105 b1317e77 2019-09-22 stsp 		} else if (n != sizeof(*h->magic)) {
 106 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 107 fc79a48d 2018-07-09 stsp 			goto done;
 108 fc79a48d 2018-07-09 stsp 		}
 109 fc79a48d 2018-07-09 stsp 	}
 110 ac62b712 2021-03-30 stsp 	if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
 111 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 112 57b35b75 2018-06-22 stsp 		goto done;
 113 57b35b75 2018-06-22 stsp 	}
 114 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->magic);
 115 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->magic);
 116 0a0a3048 2018-01-10 stsp 
 117 0cb74cf4 2018-07-08 stsp 	if (verify)
 118 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));
 119 0ebaf008 2018-01-10 stsp 
 120 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->version)) {
 121 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 122 0a0a3048 2018-01-10 stsp 		goto done;
 123 0a0a3048 2018-01-10 stsp 	}
 124 fc79a48d 2018-07-09 stsp 	if (p->map)
 125 fc79a48d 2018-07-09 stsp 		h->version = (uint32_t *)(p->map + offset);
 126 fc79a48d 2018-07-09 stsp 	else {
 127 fc79a48d 2018-07-09 stsp 		h->version = malloc(sizeof(*h->version));
 128 fc79a48d 2018-07-09 stsp 		if (h->version == NULL) {
 129 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 130 fc79a48d 2018-07-09 stsp 			goto done;
 131 fc79a48d 2018-07-09 stsp 		}
 132 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->version, sizeof(*h->version));
 133 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 134 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 135 c6368c2e 2019-10-11 stsp 			goto done;
 136 c6368c2e 2019-10-11 stsp 		} else if (n != sizeof(*h->version)) {
 137 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 138 fc79a48d 2018-07-09 stsp 			goto done;
 139 fc79a48d 2018-07-09 stsp 		}
 140 fc79a48d 2018-07-09 stsp 	}
 141 ac62b712 2021-03-30 stsp 	if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
 142 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 143 0a0a3048 2018-01-10 stsp 		goto done;
 144 0a0a3048 2018-01-10 stsp 	}
 145 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->version);
 146 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->version);
 147 0a0a3048 2018-01-10 stsp 
 148 0cb74cf4 2018-07-08 stsp 	if (verify)
 149 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));
 150 0ebaf008 2018-01-10 stsp 
 151 57b35b75 2018-06-22 stsp 	len_fanout =
 152 57b35b75 2018-06-22 stsp 	    sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
 153 57b35b75 2018-06-22 stsp 	if (remain < len_fanout) {
 154 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 155 0a0a3048 2018-01-10 stsp 		goto done;
 156 0a0a3048 2018-01-10 stsp 	}
 157 fc79a48d 2018-07-09 stsp 	if (p->map)
 158 fc79a48d 2018-07-09 stsp 		h->fanout_table = (uint32_t *)(p->map + offset);
 159 fc79a48d 2018-07-09 stsp 	else {
 160 fc79a48d 2018-07-09 stsp 		h->fanout_table = malloc(len_fanout);
 161 fc79a48d 2018-07-09 stsp 		if (h->fanout_table == NULL) {
 162 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 163 fc79a48d 2018-07-09 stsp 			goto done;
 164 fc79a48d 2018-07-09 stsp 		}
 165 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->fanout_table, len_fanout);
 166 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 167 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 168 c6368c2e 2019-10-11 stsp 			goto done;
 169 c6368c2e 2019-10-11 stsp 		} else if (n != len_fanout) {
 170 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 171 fc79a48d 2018-07-09 stsp 			goto done;
 172 fc79a48d 2018-07-09 stsp 		}
 173 fc79a48d 2018-07-09 stsp 	}
 174 c8262310 2018-06-04 stsp 	err = verify_fanout_table(h->fanout_table);
 175 0a0a3048 2018-01-10 stsp 	if (err)
 176 0a0a3048 2018-01-10 stsp 		goto done;
 177 0cb74cf4 2018-07-08 stsp 	if (verify)
 178 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
 179 57b35b75 2018-06-22 stsp 	offset += len_fanout;
 180 57b35b75 2018-06-22 stsp 	remain -= len_fanout;
 181 0a0a3048 2018-01-10 stsp 
 182 78fb0967 2020-09-09 naddy 	nobj = be32toh(h->fanout_table[0xff]);
 183 57b35b75 2018-06-22 stsp 	len_ids = nobj * sizeof(*h->sorted_ids);
 184 57b35b75 2018-06-22 stsp 	if (len_ids <= nobj || len_ids > remain) {
 185 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 186 0a0a3048 2018-01-10 stsp 		goto done;
 187 0a0a3048 2018-01-10 stsp 	}
 188 fc79a48d 2018-07-09 stsp 	if (p->map)
 189 fc79a48d 2018-07-09 stsp 		h->sorted_ids =
 190 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
 191 fc79a48d 2018-07-09 stsp 	else {
 192 fc79a48d 2018-07-09 stsp 		h->sorted_ids = malloc(len_ids);
 193 fc79a48d 2018-07-09 stsp 		if (h->sorted_ids == NULL) {
 194 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 195 fc79a48d 2018-07-09 stsp 			goto done;
 196 fc79a48d 2018-07-09 stsp 		}
 197 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->sorted_ids, len_ids);
 198 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 199 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 200 faaa1c0f 2018-09-15 stsp 		else if (n != len_ids) {
 201 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 202 fc79a48d 2018-07-09 stsp 			goto done;
 203 fc79a48d 2018-07-09 stsp 		}
 204 fc79a48d 2018-07-09 stsp 	}
 205 0cb74cf4 2018-07-08 stsp 	if (verify)
 206 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
 207 57b35b75 2018-06-22 stsp 	offset += len_ids;
 208 57b35b75 2018-06-22 stsp 	remain -= len_ids;
 209 0a0a3048 2018-01-10 stsp 
 210 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->crc32)) {
 211 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 212 0a0a3048 2018-01-10 stsp 		goto done;
 213 0a0a3048 2018-01-10 stsp 	}
 214 fc79a48d 2018-07-09 stsp 	if (p->map)
 215 fc79a48d 2018-07-09 stsp 		h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
 216 fc79a48d 2018-07-09 stsp 	else {
 217 fc79a48d 2018-07-09 stsp 		h->crc32 = malloc(nobj * sizeof(*h->crc32));
 218 fc79a48d 2018-07-09 stsp 		if (h->crc32 == NULL) {
 219 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 220 fc79a48d 2018-07-09 stsp 			goto done;
 221 fc79a48d 2018-07-09 stsp 		}
 222 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
 223 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 224 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 225 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->crc32)) {
 226 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 227 fc79a48d 2018-07-09 stsp 			goto done;
 228 fc79a48d 2018-07-09 stsp 		}
 229 fc79a48d 2018-07-09 stsp 	}
 230 0cb74cf4 2018-07-08 stsp 	if (verify)
 231 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
 232 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->crc32);
 233 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->crc32);
 234 0ebaf008 2018-01-10 stsp 
 235 57b35b75 2018-06-22 stsp 	if (remain < nobj * sizeof(*h->offsets)) {
 236 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 237 0a0a3048 2018-01-10 stsp 		goto done;
 238 0a0a3048 2018-01-10 stsp 	}
 239 fc79a48d 2018-07-09 stsp 	if (p->map)
 240 fc79a48d 2018-07-09 stsp 		h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
 241 fc79a48d 2018-07-09 stsp 	else {
 242 fc79a48d 2018-07-09 stsp 		h->offsets = malloc(nobj * sizeof(*h->offsets));
 243 fc79a48d 2018-07-09 stsp 		if (h->offsets == NULL) {
 244 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 245 fc79a48d 2018-07-09 stsp 			goto done;
 246 fc79a48d 2018-07-09 stsp 		}
 247 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
 248 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 249 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 250 faaa1c0f 2018-09-15 stsp 		else if (n != nobj * sizeof(*h->offsets)) {
 251 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 252 fc79a48d 2018-07-09 stsp 			goto done;
 253 fc79a48d 2018-07-09 stsp 		}
 254 fc79a48d 2018-07-09 stsp 	}
 255 0cb74cf4 2018-07-08 stsp 	if (verify)
 256 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t *)h->offsets,
 257 0cb74cf4 2018-07-08 stsp 		    nobj * sizeof(*h->offsets));
 258 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->offsets);
 259 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->offsets);
 260 0ebaf008 2018-01-10 stsp 
 261 0a0a3048 2018-01-10 stsp 	/* Large file offsets are contained only in files > 2GB. */
 262 c3564dfa 2021-07-15 stsp 	if (verify || packfile_size > 0x7fffffff) {
 263 c3564dfa 2021-07-15 stsp 		for (i = 0; i < nobj; i++) {
 264 c3564dfa 2021-07-15 stsp 			uint32_t o = h->offsets[i];
 265 c3564dfa 2021-07-15 stsp 			if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
 266 c3564dfa 2021-07-15 stsp 				p->nlargeobj++;
 267 c3564dfa 2021-07-15 stsp 		}
 268 5e6be232 2019-11-08 stsp 	}
 269 5e6be232 2019-11-08 stsp 	if (p->nlargeobj == 0)
 270 0a0a3048 2018-01-10 stsp 		goto checksum;
 271 c3564dfa 2021-07-15 stsp 	else if (packfile_size <= 0x7fffffff) {
 272 c3564dfa 2021-07-15 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 273 c3564dfa 2021-07-15 stsp 		goto done;
 274 c3564dfa 2021-07-15 stsp 	}
 275 0a0a3048 2018-01-10 stsp 
 276 5e6be232 2019-11-08 stsp 	if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
 277 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 278 0a0a3048 2018-01-10 stsp 		goto done;
 279 0a0a3048 2018-01-10 stsp 	}
 280 fc79a48d 2018-07-09 stsp 	if (p->map)
 281 fc79a48d 2018-07-09 stsp 		h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
 282 fc79a48d 2018-07-09 stsp 	else {
 283 5e6be232 2019-11-08 stsp 		h->large_offsets = malloc(p->nlargeobj *
 284 5e6be232 2019-11-08 stsp 		    sizeof(*h->large_offsets));
 285 de30857e 2019-08-23 stsp 		if (h->large_offsets == NULL) {
 286 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 287 fc79a48d 2018-07-09 stsp 			goto done;
 288 fc79a48d 2018-07-09 stsp 		}
 289 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->large_offsets,
 290 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 291 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 292 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 293 5e6be232 2019-11-08 stsp 		else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
 294 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 295 fc79a48d 2018-07-09 stsp 			goto done;
 296 fc79a48d 2018-07-09 stsp 		}
 297 fc79a48d 2018-07-09 stsp 	}
 298 0cb74cf4 2018-07-08 stsp 	if (verify)
 299 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, (uint8_t*)h->large_offsets,
 300 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 301 5e6be232 2019-11-08 stsp 	remain -= p->nlargeobj * sizeof(*h->large_offsets);
 302 5e6be232 2019-11-08 stsp 	offset += p->nlargeobj * sizeof(*h->large_offsets);
 303 0ebaf008 2018-01-10 stsp 
 304 0a0a3048 2018-01-10 stsp checksum:
 305 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->trailer)) {
 306 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 307 0a0a3048 2018-01-10 stsp 		goto done;
 308 0a0a3048 2018-01-10 stsp 	}
 309 fc79a48d 2018-07-09 stsp 	if (p->map)
 310 fc79a48d 2018-07-09 stsp 		h->trailer =
 311 fc79a48d 2018-07-09 stsp 		    (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
 312 fc79a48d 2018-07-09 stsp 	else {
 313 fc79a48d 2018-07-09 stsp 		h->trailer = malloc(sizeof(*h->trailer));
 314 fc79a48d 2018-07-09 stsp 		if (h->trailer == NULL) {
 315 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 316 fc79a48d 2018-07-09 stsp 			goto done;
 317 fc79a48d 2018-07-09 stsp 		}
 318 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->trailer, sizeof(*h->trailer));
 319 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 320 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 321 faaa1c0f 2018-09-15 stsp 		else if (n != sizeof(*h->trailer)) {
 322 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 323 fc79a48d 2018-07-09 stsp 			goto done;
 324 fc79a48d 2018-07-09 stsp 		}
 325 fc79a48d 2018-07-09 stsp 	}
 326 0cb74cf4 2018-07-08 stsp 	if (verify) {
 327 0cb74cf4 2018-07-08 stsp 		SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH);
 328 0cb74cf4 2018-07-08 stsp 		SHA1Final(sha1, &ctx);
 329 0cb74cf4 2018-07-08 stsp 		if (memcmp(h->trailer->packidx_sha1, sha1,
 330 0cb74cf4 2018-07-08 stsp 		    SHA1_DIGEST_LENGTH) != 0)
 331 0cb74cf4 2018-07-08 stsp 			err = got_error(GOT_ERR_PACKIDX_CSUM);
 332 0cb74cf4 2018-07-08 stsp 	}
 333 0a0a3048 2018-01-10 stsp done:
 334 817c5a18 2018-09-09 stsp 	return err;
 335 817c5a18 2018-09-09 stsp }
 336 817c5a18 2018-09-09 stsp 
 337 817c5a18 2018-09-09 stsp const struct got_error *
 338 6d5a9006 2020-12-16 yzhong got_packidx_open(struct got_packidx **packidx,
 339 6d5a9006 2020-12-16 yzhong     int dir_fd, const char *relpath, int verify)
 340 817c5a18 2018-09-09 stsp {
 341 817c5a18 2018-09-09 stsp 	const struct got_error *err = NULL;
 342 1124fe40 2021-07-07 stsp 	struct got_packidx *p = NULL;
 343 1124fe40 2021-07-07 stsp 	char *pack_relpath;
 344 c3564dfa 2021-07-15 stsp 	struct stat idx_sb, pack_sb;
 345 817c5a18 2018-09-09 stsp 
 346 817c5a18 2018-09-09 stsp 	*packidx = NULL;
 347 1124fe40 2021-07-07 stsp 
 348 1124fe40 2021-07-07 stsp 	err = got_packidx_get_packfile_path(&pack_relpath, relpath);
 349 1124fe40 2021-07-07 stsp 	if (err)
 350 1124fe40 2021-07-07 stsp 		return err;
 351 1124fe40 2021-07-07 stsp 
 352 1124fe40 2021-07-07 stsp 	/*
 353 1124fe40 2021-07-07 stsp 	 * Ensure that a corresponding pack file exists.
 354 1124fe40 2021-07-07 stsp 	 * Some Git repositories have this problem. Git seems to ignore
 355 1124fe40 2021-07-07 stsp 	 * the existence of lonely pack index files but we do not.
 356 1124fe40 2021-07-07 stsp 	 */
 357 c3564dfa 2021-07-15 stsp 	if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
 358 1124fe40 2021-07-07 stsp 		if (errno == ENOENT) {
 359 1124fe40 2021-07-07 stsp 			err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
 360 1124fe40 2021-07-07 stsp 			    "%s", relpath);
 361 1124fe40 2021-07-07 stsp 		} else
 362 1124fe40 2021-07-07 stsp 			err = got_error_from_errno2("fstatat", pack_relpath);
 363 1124fe40 2021-07-07 stsp 		goto done;
 364 1124fe40 2021-07-07 stsp 	}
 365 817c5a18 2018-09-09 stsp 
 366 817c5a18 2018-09-09 stsp 	p = calloc(1, sizeof(*p));
 367 1124fe40 2021-07-07 stsp 	if (p == NULL) {
 368 1124fe40 2021-07-07 stsp 		err = got_error_from_errno("calloc");
 369 1124fe40 2021-07-07 stsp 		goto done;
 370 1124fe40 2021-07-07 stsp 	}
 371 817c5a18 2018-09-09 stsp 
 372 e7ae0baf 2021-12-31 stsp 	p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 373 6772cf22 2019-08-28 hiltjo 	if (p->fd == -1) {
 374 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("openat", relpath);
 375 1124fe40 2021-07-07 stsp 		goto done;
 376 6772cf22 2019-08-28 hiltjo 	}
 377 817c5a18 2018-09-09 stsp 
 378 c3564dfa 2021-07-15 stsp 	if (fstat(p->fd, &idx_sb) != 0) {
 379 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("fstat", relpath);
 380 1124fe40 2021-07-07 stsp 		goto done;
 381 817c5a18 2018-09-09 stsp 	}
 382 c3564dfa 2021-07-15 stsp 	p->len = idx_sb.st_size;
 383 817c5a18 2018-09-09 stsp 	if (p->len < sizeof(p->hdr)) {
 384 817c5a18 2018-09-09 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 385 1124fe40 2021-07-07 stsp 		goto done;
 386 817c5a18 2018-09-09 stsp 	}
 387 817c5a18 2018-09-09 stsp 
 388 6d5a9006 2020-12-16 yzhong 	p->path_packidx = strdup(relpath);
 389 817c5a18 2018-09-09 stsp 	if (p->path_packidx == NULL) {
 390 638f9024 2019-05-13 stsp 		err = got_error_from_errno("strdup");
 391 817c5a18 2018-09-09 stsp 		goto done;
 392 817c5a18 2018-09-09 stsp 	}
 393 817c5a18 2018-09-09 stsp 
 394 817c5a18 2018-09-09 stsp #ifndef GOT_PACK_NO_MMAP
 395 1c28a361 2022-10-25 op 	if (p->len > 0 && p->len <= SIZE_MAX) {
 396 1c28a361 2022-10-25 op 		p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
 397 1c28a361 2022-10-25 op 		if (p->map == MAP_FAILED) {
 398 1c28a361 2022-10-25 op 			if (errno != ENOMEM) {
 399 1c28a361 2022-10-25 op 				err = got_error_from_errno("mmap");
 400 1c28a361 2022-10-25 op 				goto done;
 401 1c28a361 2022-10-25 op 			}
 402 1c28a361 2022-10-25 op 			p->map = NULL; /* fall back to read(2) */
 403 3a11398b 2019-02-21 stsp 		}
 404 3a11398b 2019-02-21 stsp 	}
 405 817c5a18 2018-09-09 stsp #endif
 406 817c5a18 2018-09-09 stsp 
 407 c3564dfa 2021-07-15 stsp 	err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
 408 817c5a18 2018-09-09 stsp done:
 409 1124fe40 2021-07-07 stsp 	if (err) {
 410 1124fe40 2021-07-07 stsp 		if (p)
 411 1124fe40 2021-07-07 stsp 			got_packidx_close(p);
 412 1124fe40 2021-07-07 stsp 	} else
 413 0a0a3048 2018-01-10 stsp 		*packidx = p;
 414 1124fe40 2021-07-07 stsp 	free(pack_relpath);
 415 0a0a3048 2018-01-10 stsp 	return err;
 416 0a0a3048 2018-01-10 stsp }
 417 0a0a3048 2018-01-10 stsp 
 418 57b35b75 2018-06-22 stsp const struct got_error *
 419 6fd11751 2018-06-04 stsp got_packidx_close(struct got_packidx *packidx)
 420 0a0a3048 2018-01-10 stsp {
 421 57b35b75 2018-06-22 stsp 	const struct got_error *err = NULL;
 422 57b35b75 2018-06-22 stsp 
 423 6fd11751 2018-06-04 stsp 	free(packidx->path_packidx);
 424 fc79a48d 2018-07-09 stsp 	if (packidx->map) {
 425 57b35b75 2018-06-22 stsp 		if (munmap(packidx->map, packidx->len) == -1)
 426 638f9024 2019-05-13 stsp 			err = got_error_from_errno("munmap");
 427 fc79a48d 2018-07-09 stsp 	} else {
 428 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.magic);
 429 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.version);
 430 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.fanout_table);
 431 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.sorted_ids);
 432 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.crc32);
 433 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.offsets);
 434 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.large_offsets);
 435 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.trailer);
 436 57b35b75 2018-06-22 stsp 	}
 437 08578a35 2021-01-22 stsp 	if (close(packidx->fd) == -1 && err == NULL)
 438 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 439 67fd6849 2022-02-13 stsp 	free(packidx->sorted_offsets);
 440 67fd6849 2022-02-13 stsp 	free(packidx->sorted_large_offsets);
 441 0a0a3048 2018-01-10 stsp 	free(packidx);
 442 57b35b75 2018-06-22 stsp 
 443 57b35b75 2018-06-22 stsp 	return err;
 444 a1fd68d8 2018-01-12 stsp }
 445 509c9973 2021-04-10 stsp 
 446 509c9973 2021-04-10 stsp const struct got_error *
 447 aea75d87 2021-07-06 stsp got_packidx_get_packfile_path(char **path_packfile, const char *path_packidx)
 448 509c9973 2021-04-10 stsp {
 449 509c9973 2021-04-10 stsp 	size_t size;
 450 509c9973 2021-04-10 stsp 
 451 509c9973 2021-04-10 stsp 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
 452 aea75d87 2021-07-06 stsp 	size = strlen(path_packidx) + 2;
 453 509c9973 2021-04-10 stsp 	if (size < GOT_PACKFILE_NAMELEN + 1)
 454 aea75d87 2021-07-06 stsp 		return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
 455 a1fd68d8 2018-01-12 stsp 
 456 509c9973 2021-04-10 stsp 	*path_packfile = malloc(size);
 457 509c9973 2021-04-10 stsp 	if (*path_packfile == NULL)
 458 509c9973 2021-04-10 stsp 		return got_error_from_errno("malloc");
 459 509c9973 2021-04-10 stsp 
 460 509c9973 2021-04-10 stsp 	/* Copy up to and excluding ".idx". */
 461 aea75d87 2021-07-06 stsp 	if (strlcpy(*path_packfile, path_packidx,
 462 509c9973 2021-04-10 stsp 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
 463 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 464 509c9973 2021-04-10 stsp 
 465 509c9973 2021-04-10 stsp 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
 466 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 467 509c9973 2021-04-10 stsp 
 468 509c9973 2021-04-10 stsp 	return NULL;
 469 509c9973 2021-04-10 stsp }
 470 509c9973 2021-04-10 stsp 
 471 02828bfd 2021-06-22 stsp off_t
 472 02828bfd 2021-06-22 stsp got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
 473 a1fd68d8 2018-01-12 stsp {
 474 78fb0967 2020-09-09 naddy 	uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
 475 a1fd68d8 2018-01-12 stsp 	if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 476 a1fd68d8 2018-01-12 stsp 		uint64_t loffset;
 477 a1fd68d8 2018-01-12 stsp 		idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 478 5e6be232 2019-11-08 stsp 		if (idx < 0 || idx >= packidx->nlargeobj ||
 479 6fd11751 2018-06-04 stsp 		    packidx->hdr.large_offsets == NULL)
 480 a1fd68d8 2018-01-12 stsp 			return -1;
 481 78fb0967 2020-09-09 naddy 		loffset = be64toh(packidx->hdr.large_offsets[idx]);
 482 a1fd68d8 2018-01-12 stsp 		return (loffset > INT64_MAX ? -1 : (off_t)loffset);
 483 a1fd68d8 2018-01-12 stsp 	}
 484 a1fd68d8 2018-01-12 stsp 	return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
 485 a1fd68d8 2018-01-12 stsp }
 486 a1fd68d8 2018-01-12 stsp 
 487 1510f469 2018-09-09 stsp int
 488 c0df5966 2021-12-31 stsp got_packidx_get_object_idx(struct got_packidx *packidx,
 489 c0df5966 2021-12-31 stsp     struct got_object_id *id)
 490 a1fd68d8 2018-01-12 stsp {
 491 00927983 2020-04-19 stsp 	u_int8_t id0 = id->sha1[0];
 492 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 493 40aeb19c 2018-06-22 stsp 	int left = 0, right = totobj - 1;
 494 a1fd68d8 2018-01-12 stsp 
 495 a1fd68d8 2018-01-12 stsp 	if (id0 > 0)
 496 78fb0967 2020-09-09 naddy 		left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 497 a1fd68d8 2018-01-12 stsp 
 498 40aeb19c 2018-06-22 stsp 	while (left <= right) {
 499 57b35b75 2018-06-22 stsp 		struct got_packidx_object_id *oid;
 500 40aeb19c 2018-06-22 stsp 		int i, cmp;
 501 a1fd68d8 2018-01-12 stsp 
 502 40aeb19c 2018-06-22 stsp 		i = ((left + right) / 2);
 503 40aeb19c 2018-06-22 stsp 		oid = &packidx->hdr.sorted_ids[i];
 504 00927983 2020-04-19 stsp 		cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 505 16dcbf91 2018-04-01 stsp 		if (cmp == 0)
 506 6c00b545 2018-01-17 stsp 			return i;
 507 40aeb19c 2018-06-22 stsp 		else if (cmp > 0)
 508 40aeb19c 2018-06-22 stsp 			left = i + 1;
 509 40aeb19c 2018-06-22 stsp 		else if (cmp < 0)
 510 40aeb19c 2018-06-22 stsp 			right = i - 1;
 511 a1fd68d8 2018-01-12 stsp 	}
 512 a1fd68d8 2018-01-12 stsp 
 513 a1fd68d8 2018-01-12 stsp 	return -1;
 514 67fd6849 2022-02-13 stsp }
 515 67fd6849 2022-02-13 stsp 
 516 67fd6849 2022-02-13 stsp static int
 517 67fd6849 2022-02-13 stsp offset_cmp(const void *pa, const void *pb)
 518 67fd6849 2022-02-13 stsp {
 519 67fd6849 2022-02-13 stsp 	const struct got_pack_offset_index *a, *b;
 520 67fd6849 2022-02-13 stsp 
 521 67fd6849 2022-02-13 stsp 	a = (const struct got_pack_offset_index *)pa;
 522 67fd6849 2022-02-13 stsp 	b = (const struct got_pack_offset_index *)pb;
 523 67fd6849 2022-02-13 stsp 
 524 67fd6849 2022-02-13 stsp 	if (a->offset < b->offset)
 525 67fd6849 2022-02-13 stsp 		return -1;
 526 67fd6849 2022-02-13 stsp 	else if (a->offset > b->offset)
 527 67fd6849 2022-02-13 stsp 		return 1;
 528 67fd6849 2022-02-13 stsp 
 529 67fd6849 2022-02-13 stsp 	return 0;
 530 876c234b 2018-09-10 stsp }
 531 876c234b 2018-09-10 stsp 
 532 67fd6849 2022-02-13 stsp static int
 533 67fd6849 2022-02-13 stsp large_offset_cmp(const void *pa, const void *pb)
 534 67fd6849 2022-02-13 stsp {
 535 67fd6849 2022-02-13 stsp 	const struct got_pack_large_offset_index *a, *b;
 536 67fd6849 2022-02-13 stsp 
 537 67fd6849 2022-02-13 stsp 	a = (const struct got_pack_large_offset_index *)pa;
 538 67fd6849 2022-02-13 stsp 	b = (const struct got_pack_large_offset_index *)pb;
 539 67fd6849 2022-02-13 stsp 
 540 67fd6849 2022-02-13 stsp 	if (a->offset < b->offset)
 541 67fd6849 2022-02-13 stsp 		return -1;
 542 67fd6849 2022-02-13 stsp 	else if (a->offset > b->offset)
 543 67fd6849 2022-02-13 stsp 		return 1;
 544 67fd6849 2022-02-13 stsp 
 545 67fd6849 2022-02-13 stsp 	return 0;
 546 67fd6849 2022-02-13 stsp }
 547 67fd6849 2022-02-13 stsp 
 548 67fd6849 2022-02-13 stsp static const struct got_error *
 549 67fd6849 2022-02-13 stsp build_offset_index(struct got_packidx *p)
 550 67fd6849 2022-02-13 stsp {
 551 67fd6849 2022-02-13 stsp 	uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
 552 67fd6849 2022-02-13 stsp 	unsigned int i, j, k;
 553 67fd6849 2022-02-13 stsp 
 554 67fd6849 2022-02-13 stsp 	p->sorted_offsets = calloc(nobj - p->nlargeobj,
 555 67fd6849 2022-02-13 stsp 	    sizeof(p->sorted_offsets[0]));
 556 67fd6849 2022-02-13 stsp 	if (p->sorted_offsets == NULL)
 557 67fd6849 2022-02-13 stsp 		return got_error_from_errno("calloc");
 558 67fd6849 2022-02-13 stsp 
 559 67fd6849 2022-02-13 stsp 	if (p->nlargeobj > 0) {
 560 67fd6849 2022-02-13 stsp 		p->sorted_large_offsets = calloc(p->nlargeobj,
 561 67fd6849 2022-02-13 stsp 		    sizeof(p->sorted_large_offsets[0]));
 562 67fd6849 2022-02-13 stsp 		if (p->sorted_large_offsets == NULL)
 563 67fd6849 2022-02-13 stsp 			return got_error_from_errno("calloc");
 564 67fd6849 2022-02-13 stsp 	}
 565 67fd6849 2022-02-13 stsp 
 566 67fd6849 2022-02-13 stsp 	j = 0;
 567 67fd6849 2022-02-13 stsp 	k = 0;
 568 67fd6849 2022-02-13 stsp 	for (i = 0; i < nobj; i++) {
 569 67fd6849 2022-02-13 stsp 		uint32_t offset = be32toh(p->hdr.offsets[i]);
 570 67fd6849 2022-02-13 stsp 		if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 571 67fd6849 2022-02-13 stsp 			uint64_t loffset;
 572 67fd6849 2022-02-13 stsp 			uint32_t idx;
 573 67fd6849 2022-02-13 stsp 			idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 574 67fd6849 2022-02-13 stsp 			if (idx >= p->nlargeobj ||
 575 67fd6849 2022-02-13 stsp 			    p->nlargeobj == 0 ||
 576 67fd6849 2022-02-13 stsp 			    p->hdr.large_offsets == NULL)
 577 67fd6849 2022-02-13 stsp 				return got_error(GOT_ERR_BAD_PACKIDX);
 578 67fd6849 2022-02-13 stsp 			loffset = be64toh(p->hdr.large_offsets[idx]);
 579 67fd6849 2022-02-13 stsp 			p->sorted_large_offsets[j].offset = loffset;
 580 67fd6849 2022-02-13 stsp 			p->sorted_large_offsets[j].idx = i;
 581 67fd6849 2022-02-13 stsp 			j++;
 582 67fd6849 2022-02-13 stsp 		} else {
 583 67fd6849 2022-02-13 stsp 			p->sorted_offsets[k].offset = offset;
 584 67fd6849 2022-02-13 stsp 			p->sorted_offsets[k].idx = i;
 585 67fd6849 2022-02-13 stsp 			k++;
 586 67fd6849 2022-02-13 stsp 		}
 587 67fd6849 2022-02-13 stsp 	}
 588 67fd6849 2022-02-13 stsp 	if (j != p->nlargeobj || k != nobj - p->nlargeobj)
 589 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
 590 67fd6849 2022-02-13 stsp 
 591 67fd6849 2022-02-13 stsp 	qsort(p->sorted_offsets, nobj - p->nlargeobj,
 592 67fd6849 2022-02-13 stsp 	    sizeof(p->sorted_offsets[0]), offset_cmp);
 593 67fd6849 2022-02-13 stsp 
 594 67fd6849 2022-02-13 stsp 	if (p->sorted_large_offsets)
 595 67fd6849 2022-02-13 stsp 		qsort(p->sorted_large_offsets, p->nlargeobj,
 596 67fd6849 2022-02-13 stsp 		    sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
 597 67fd6849 2022-02-13 stsp 
 598 67fd6849 2022-02-13 stsp 	return NULL;
 599 67fd6849 2022-02-13 stsp }
 600 67fd6849 2022-02-13 stsp 
 601 876c234b 2018-09-10 stsp const struct got_error *
 602 67fd6849 2022-02-13 stsp got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
 603 67fd6849 2022-02-13 stsp {
 604 67fd6849 2022-02-13 stsp 	const struct got_error *err;
 605 67fd6849 2022-02-13 stsp 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 606 67fd6849 2022-02-13 stsp 	int i, left, right;
 607 67fd6849 2022-02-13 stsp 
 608 67fd6849 2022-02-13 stsp 	*idx = -1;
 609 67fd6849 2022-02-13 stsp 
 610 67fd6849 2022-02-13 stsp 	if (packidx->sorted_offsets == NULL) {
 611 67fd6849 2022-02-13 stsp 		err = build_offset_index(packidx);
 612 67fd6849 2022-02-13 stsp 		if (err)
 613 67fd6849 2022-02-13 stsp 			return err;
 614 67fd6849 2022-02-13 stsp 	}
 615 67fd6849 2022-02-13 stsp 
 616 67fd6849 2022-02-13 stsp 	if (offset >= 0x7fffffff) {
 617 67fd6849 2022-02-13 stsp 		uint64_t lo;
 618 67fd6849 2022-02-13 stsp 		left = 0, right = packidx->nlargeobj - 1;
 619 67fd6849 2022-02-13 stsp 		while (left <= right) {
 620 67fd6849 2022-02-13 stsp 			i = ((left + right) / 2);
 621 67fd6849 2022-02-13 stsp 			lo = packidx->sorted_large_offsets[i].offset;
 622 67fd6849 2022-02-13 stsp 			if (lo == offset) {
 623 67fd6849 2022-02-13 stsp 				*idx = packidx->sorted_large_offsets[i].idx;
 624 67fd6849 2022-02-13 stsp 				break;
 625 67fd6849 2022-02-13 stsp 			} else if (offset > lo)
 626 67fd6849 2022-02-13 stsp 				left = i + 1;
 627 67fd6849 2022-02-13 stsp 			else if (offset < lo)
 628 67fd6849 2022-02-13 stsp 				right = i - 1;
 629 67fd6849 2022-02-13 stsp 		}
 630 67fd6849 2022-02-13 stsp 	} else {
 631 67fd6849 2022-02-13 stsp 		uint32_t o;
 632 67fd6849 2022-02-13 stsp 		left = 0, right = totobj - packidx->nlargeobj - 1;
 633 67fd6849 2022-02-13 stsp 		while (left <= right) {
 634 67fd6849 2022-02-13 stsp 			i = ((left + right) / 2);
 635 67fd6849 2022-02-13 stsp 			o = packidx->sorted_offsets[i].offset;
 636 67fd6849 2022-02-13 stsp 			if (o == offset) {
 637 67fd6849 2022-02-13 stsp 				*idx = packidx->sorted_offsets[i].idx;
 638 67fd6849 2022-02-13 stsp 				break;
 639 67fd6849 2022-02-13 stsp 			} else if (offset > o)
 640 67fd6849 2022-02-13 stsp 				left = i + 1;
 641 67fd6849 2022-02-13 stsp 			else if (offset < o)
 642 67fd6849 2022-02-13 stsp 				right = i - 1;
 643 67fd6849 2022-02-13 stsp 		}
 644 67fd6849 2022-02-13 stsp 	}
 645 67fd6849 2022-02-13 stsp 
 646 67fd6849 2022-02-13 stsp 	return NULL;
 647 67fd6849 2022-02-13 stsp }
 648 67fd6849 2022-02-13 stsp 
 649 67fd6849 2022-02-13 stsp const struct got_error *
 650 67fd6849 2022-02-13 stsp got_packidx_get_object_id(struct got_object_id *id,
 651 67fd6849 2022-02-13 stsp     struct got_packidx *packidx, int idx)
 652 67fd6849 2022-02-13 stsp {
 653 67fd6849 2022-02-13 stsp 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 654 67fd6849 2022-02-13 stsp 	struct got_packidx_object_id *oid;
 655 67fd6849 2022-02-13 stsp 
 656 67fd6849 2022-02-13 stsp 	if (idx < 0 || idx >= totobj)
 657 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_NO_OBJ);
 658 67fd6849 2022-02-13 stsp 
 659 67fd6849 2022-02-13 stsp 	oid = &packidx->hdr.sorted_ids[idx];
 660 67fd6849 2022-02-13 stsp 	memcpy(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 661 67fd6849 2022-02-13 stsp 	return NULL;
 662 67fd6849 2022-02-13 stsp }
 663 67fd6849 2022-02-13 stsp 
 664 67fd6849 2022-02-13 stsp const struct got_error *
 665 dd88155e 2019-06-29 stsp got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
 666 4277420a 2019-06-29 stsp     struct got_packidx *packidx, const char *id_str_prefix)
 667 e09a504c 2019-06-28 stsp {
 668 dd88155e 2019-06-29 stsp 	const struct got_error *err = NULL;
 669 4277420a 2019-06-29 stsp 	u_int8_t id0;
 670 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 671 4277420a 2019-06-29 stsp 	char hex[3];
 672 4277420a 2019-06-29 stsp 	size_t prefix_len = strlen(id_str_prefix);
 673 e09a504c 2019-06-28 stsp 	struct got_packidx_object_id *oid;
 674 404bde06 2022-01-03 stsp 	uint32_t i = 0;
 675 e09a504c 2019-06-28 stsp 
 676 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(matched_ids);
 677 4277420a 2019-06-29 stsp 
 678 4277420a 2019-06-29 stsp 	if (prefix_len < 2)
 679 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 680 4277420a 2019-06-29 stsp 
 681 4277420a 2019-06-29 stsp 	hex[0] = id_str_prefix[0];
 682 4277420a 2019-06-29 stsp 	hex[1] = id_str_prefix[1];
 683 4277420a 2019-06-29 stsp 	hex[2] = '\0';
 684 4277420a 2019-06-29 stsp 	if (!got_parse_xdigit(&id0, hex))
 685 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 686 4277420a 2019-06-29 stsp 
 687 404bde06 2022-01-03 stsp 	if (id0 > 0)
 688 404bde06 2022-01-03 stsp 		i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 689 4277420a 2019-06-29 stsp 	oid = &packidx->hdr.sorted_ids[i];
 690 4277420a 2019-06-29 stsp 	while (i < totobj && oid->sha1[0] == id0) {
 691 4277420a 2019-06-29 stsp 		char id_str[SHA1_DIGEST_STRING_LENGTH];
 692 dd88155e 2019-06-29 stsp 		struct got_object_qid *qid;
 693 4277420a 2019-06-29 stsp 		int cmp;
 694 4277420a 2019-06-29 stsp 
 695 4277420a 2019-06-29 stsp 		if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
 696 4277420a 2019-06-29 stsp 		        return got_error(GOT_ERR_NO_SPACE);
 697 4277420a 2019-06-29 stsp 
 698 4277420a 2019-06-29 stsp 		cmp = strncmp(id_str, id_str_prefix, prefix_len);
 699 4277420a 2019-06-29 stsp 		if (cmp < 0) {
 700 4277420a 2019-06-29 stsp 			oid = &packidx->hdr.sorted_ids[++i];
 701 4277420a 2019-06-29 stsp 			continue;
 702 4277420a 2019-06-29 stsp 		} else if (cmp > 0)
 703 e09a504c 2019-06-28 stsp 			break;
 704 4277420a 2019-06-29 stsp 
 705 dd88155e 2019-06-29 stsp 		err = got_object_qid_alloc_partial(&qid);
 706 dd88155e 2019-06-29 stsp 		if (err)
 707 dd88155e 2019-06-29 stsp 			break;
 708 d7b5a0e8 2022-04-20 stsp 		memcpy(qid->id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
 709 dbdddfee 2021-06-23 naddy 		STAILQ_INSERT_TAIL(matched_ids, qid, entry);
 710 4277420a 2019-06-29 stsp 
 711 4277420a 2019-06-29 stsp 		oid = &packidx->hdr.sorted_ids[++i];
 712 e09a504c 2019-06-28 stsp 	}
 713 e09a504c 2019-06-28 stsp 
 714 0adc7bcc 2019-06-29 stsp 	if (err)
 715 0adc7bcc 2019-06-29 stsp 		got_object_id_queue_free(matched_ids);
 716 3d589bee 2022-06-25 stsp 	return err;
 717 3d589bee 2022-06-25 stsp }
 718 3d589bee 2022-06-25 stsp 
 719 3d589bee 2022-06-25 stsp static void
 720 3d589bee 2022-06-25 stsp set_max_datasize(void)
 721 3d589bee 2022-06-25 stsp {
 722 3d589bee 2022-06-25 stsp 	struct rlimit rl;
 723 3d589bee 2022-06-25 stsp 
 724 3d589bee 2022-06-25 stsp 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
 725 3d589bee 2022-06-25 stsp 		return;
 726 3d589bee 2022-06-25 stsp 
 727 3d589bee 2022-06-25 stsp 	rl.rlim_cur = rl.rlim_max;
 728 3d589bee 2022-06-25 stsp 	setrlimit(RLIMIT_DATA, &rl);
 729 3d589bee 2022-06-25 stsp }
 730 3d589bee 2022-06-25 stsp 
 731 3d589bee 2022-06-25 stsp const struct got_error *
 732 3d589bee 2022-06-25 stsp got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
 733 3d589bee 2022-06-25 stsp {
 734 3d589bee 2022-06-25 stsp 	const struct got_error *err = NULL;
 735 3d589bee 2022-06-25 stsp 	int imsg_fds[2];
 736 3d589bee 2022-06-25 stsp 	pid_t pid;
 737 3d589bee 2022-06-25 stsp 	struct imsgbuf *ibuf;
 738 3d589bee 2022-06-25 stsp 
 739 3d589bee 2022-06-25 stsp 	ibuf = calloc(1, sizeof(*ibuf));
 740 3d589bee 2022-06-25 stsp 	if (ibuf == NULL)
 741 3d589bee 2022-06-25 stsp 		return got_error_from_errno("calloc");
 742 3d589bee 2022-06-25 stsp 
 743 3d589bee 2022-06-25 stsp 	pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
 744 3d589bee 2022-06-25 stsp 	if (pack->privsep_child == NULL) {
 745 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("calloc");
 746 3d589bee 2022-06-25 stsp 		free(ibuf);
 747 3d589bee 2022-06-25 stsp 		return err;
 748 3d589bee 2022-06-25 stsp 	}
 749 3d589bee 2022-06-25 stsp 	pack->child_has_tempfiles = 0;
 750 3d589bee 2022-06-25 stsp 	pack->child_has_delta_outfd = 0;
 751 3d589bee 2022-06-25 stsp 
 752 3d589bee 2022-06-25 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
 753 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("socketpair");
 754 3d589bee 2022-06-25 stsp 		goto done;
 755 3d589bee 2022-06-25 stsp 	}
 756 3d589bee 2022-06-25 stsp 
 757 3d589bee 2022-06-25 stsp 	pid = fork();
 758 3d589bee 2022-06-25 stsp 	if (pid == -1) {
 759 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("fork");
 760 3d589bee 2022-06-25 stsp 		goto done;
 761 3d589bee 2022-06-25 stsp 	} else if (pid == 0) {
 762 3d589bee 2022-06-25 stsp 		set_max_datasize();
 763 3d589bee 2022-06-25 stsp 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
 764 3d589bee 2022-06-25 stsp 		    pack->path_packfile);
 765 3d589bee 2022-06-25 stsp 		/* not reached */
 766 3d589bee 2022-06-25 stsp 	}
 767 3d589bee 2022-06-25 stsp 
 768 3d589bee 2022-06-25 stsp 	if (close(imsg_fds[1]) == -1)
 769 3d589bee 2022-06-25 stsp 		return got_error_from_errno("close");
 770 3d589bee 2022-06-25 stsp 	pack->privsep_child->imsg_fd = imsg_fds[0];
 771 3d589bee 2022-06-25 stsp 	pack->privsep_child->pid = pid;
 772 3d589bee 2022-06-25 stsp 	imsg_init(ibuf, imsg_fds[0]);
 773 3d589bee 2022-06-25 stsp 	pack->privsep_child->ibuf = ibuf;
 774 3d589bee 2022-06-25 stsp 
 775 3d589bee 2022-06-25 stsp 	err = got_privsep_init_pack_child(ibuf, pack, packidx);
 776 3d589bee 2022-06-25 stsp 	if (err) {
 777 3d589bee 2022-06-25 stsp 		const struct got_error *child_err;
 778 3d589bee 2022-06-25 stsp 		err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 779 3d589bee 2022-06-25 stsp 		child_err = got_privsep_wait_for_child(
 780 3d589bee 2022-06-25 stsp 		    pack->privsep_child->pid);
 781 3d589bee 2022-06-25 stsp 		if (child_err && err == NULL)
 782 3d589bee 2022-06-25 stsp 			err = child_err;
 783 3d589bee 2022-06-25 stsp 	}
 784 3d589bee 2022-06-25 stsp done:
 785 3d589bee 2022-06-25 stsp 	if (err) {
 786 3d589bee 2022-06-25 stsp 		free(ibuf);
 787 3d589bee 2022-06-25 stsp 		free(pack->privsep_child);
 788 3d589bee 2022-06-25 stsp 		pack->privsep_child = NULL;
 789 3d589bee 2022-06-25 stsp 	}
 790 dd88155e 2019-06-29 stsp 	return err;
 791 e09a504c 2019-06-28 stsp }
 792 e09a504c 2019-06-28 stsp 
 793 b4f37570 2021-06-19 stsp static const struct got_error *
 794 b4f37570 2021-06-19 stsp pack_stop_privsep_child(struct got_pack *pack)
 795 876c234b 2018-09-10 stsp {
 796 74ef8aae 2022-10-24 stsp 	const struct got_error *err = NULL, *close_err = NULL;
 797 876c234b 2018-09-10 stsp 
 798 876c234b 2018-09-10 stsp 	if (pack->privsep_child == NULL)
 799 876c234b 2018-09-10 stsp 		return NULL;
 800 876c234b 2018-09-10 stsp 
 801 876c234b 2018-09-10 stsp 	err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 802 96732e0b 2018-11-11 stsp 	if (err)
 803 96732e0b 2018-11-11 stsp 		return err;
 804 74ef8aae 2022-10-24 stsp 	if (close(pack->privsep_child->imsg_fd) == -1)
 805 74ef8aae 2022-10-24 stsp 		close_err = got_error_from_errno("close");
 806 96732e0b 2018-11-11 stsp 	err = got_privsep_wait_for_child(pack->privsep_child->pid);
 807 74ef8aae 2022-10-24 stsp 	if (close_err && err == NULL)
 808 74ef8aae 2022-10-24 stsp 		err = close_err;
 809 74ef8aae 2022-10-24 stsp 	imsg_clear(pack->privsep_child->ibuf);
 810 cc2a8ef4 2021-06-19 tracey 	free(pack->privsep_child->ibuf);
 811 876c234b 2018-09-10 stsp 	free(pack->privsep_child);
 812 876c234b 2018-09-10 stsp 	pack->privsep_child = NULL;
 813 876c234b 2018-09-10 stsp 	return err;
 814 7e656b93 2018-03-17 stsp }
 815 7e656b93 2018-03-17 stsp 
 816 d7464085 2018-07-09 stsp const struct got_error *
 817 7e656b93 2018-03-17 stsp got_pack_close(struct got_pack *pack)
 818 7e656b93 2018-03-17 stsp {
 819 d7464085 2018-07-09 stsp 	const struct got_error *err = NULL;
 820 d7464085 2018-07-09 stsp 
 821 b4f37570 2021-06-19 stsp 	err = pack_stop_privsep_child(pack);
 822 876c234b 2018-09-10 stsp 	if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
 823 638f9024 2019-05-13 stsp 		err = got_error_from_errno("munmap");
 824 08578a35 2021-01-22 stsp 	if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
 825 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 826 8b2180d4 2018-04-26 stsp 	pack->fd = -1;
 827 4589e373 2018-03-17 stsp 	free(pack->path_packfile);
 828 4589e373 2018-03-17 stsp 	pack->path_packfile = NULL;
 829 4589e373 2018-03-17 stsp 	pack->filesize = 0;
 830 ab2f42e7 2019-11-10 stsp 	if (pack->delta_cache) {
 831 ab2f42e7 2019-11-10 stsp 		got_delta_cache_free(pack->delta_cache);
 832 ab2f42e7 2019-11-10 stsp 		pack->delta_cache = NULL;
 833 ab2f42e7 2019-11-10 stsp 	}
 834 7e656b93 2018-03-17 stsp 
 835 57160834 2022-05-31 stsp 	/*
 836 57160834 2022-05-31 stsp 	 * Leave accumfd and basefd alone. They are managed by the
 837 57160834 2022-05-31 stsp 	 * repository layer and can be reused.
 838 57160834 2022-05-31 stsp 	 */
 839 57160834 2022-05-31 stsp 
 840 c7fe698a 2018-01-23 stsp 	return err;
 841 c7fe698a 2018-01-23 stsp }
 842 c7fe698a 2018-01-23 stsp 
 843 668a20f6 2020-03-18 stsp const struct got_error *
 844 668a20f6 2020-03-18 stsp got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
 845 d7464085 2018-07-09 stsp     struct got_pack *pack, off_t offset)
 846 a487c1d0 2018-01-14 stsp {
 847 a487c1d0 2018-01-14 stsp 	uint8_t t = 0;
 848 a487c1d0 2018-01-14 stsp 	uint64_t s = 0;
 849 a487c1d0 2018-01-14 stsp 	uint8_t sizeN;
 850 d7464085 2018-07-09 stsp 	size_t mapoff = 0;
 851 a487c1d0 2018-01-14 stsp 	int i = 0;
 852 d7464085 2018-07-09 stsp 
 853 d7464085 2018-07-09 stsp 	*len = 0;
 854 d7464085 2018-07-09 stsp 
 855 d7464085 2018-07-09 stsp 	if (offset >= pack->filesize)
 856 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 857 d7464085 2018-07-09 stsp 
 858 d7464085 2018-07-09 stsp 	if (pack->map) {
 859 d7464085 2018-07-09 stsp 		mapoff = (size_t)offset;
 860 d7464085 2018-07-09 stsp 	} else {
 861 d7464085 2018-07-09 stsp 		if (lseek(pack->fd, offset, SEEK_SET) == -1)
 862 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
 863 d7464085 2018-07-09 stsp 	}
 864 a487c1d0 2018-01-14 stsp 
 865 a1fd68d8 2018-01-12 stsp 	do {
 866 a1fd68d8 2018-01-12 stsp 		/* We do not support size values which don't fit in 64 bit. */
 867 a487c1d0 2018-01-14 stsp 		if (i > 9)
 868 09ee8ded 2022-10-20 stsp 			return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
 869 e082ed67 2022-10-24 naddy 			    "packfile offset %lld", (long long)offset);
 870 a1fd68d8 2018-01-12 stsp 
 871 d7464085 2018-07-09 stsp 		if (pack->map) {
 872 3976db15 2022-01-10 stsp 			if (mapoff + sizeof(sizeN) >= pack->filesize)
 873 3976db15 2022-01-10 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 874 d7464085 2018-07-09 stsp 			sizeN = *(pack->map + mapoff);
 875 d7464085 2018-07-09 stsp 			mapoff += sizeof(sizeN);
 876 d7464085 2018-07-09 stsp 		} else {
 877 d7464085 2018-07-09 stsp 			ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
 878 d7464085 2018-07-09 stsp 			if (n < 0)
 879 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 880 d7464085 2018-07-09 stsp 			if (n != sizeof(sizeN))
 881 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 882 d7464085 2018-07-09 stsp 		}
 883 d7464085 2018-07-09 stsp 		*len += sizeof(sizeN);
 884 8251fdbc 2018-01-12 stsp 
 885 a1fd68d8 2018-01-12 stsp 		if (i == 0) {
 886 a487c1d0 2018-01-14 stsp 			t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
 887 a1fd68d8 2018-01-12 stsp 			    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
 888 a487c1d0 2018-01-14 stsp 			s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
 889 a1fd68d8 2018-01-12 stsp 		} else {
 890 a1fd68d8 2018-01-12 stsp 			size_t shift = 4 + 7 * (i - 1);
 891 a487c1d0 2018-01-14 stsp 			s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
 892 a1fd68d8 2018-01-12 stsp 		}
 893 a1fd68d8 2018-01-12 stsp 		i++;
 894 a1fd68d8 2018-01-12 stsp 	} while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
 895 a1fd68d8 2018-01-12 stsp 
 896 a487c1d0 2018-01-14 stsp 	*type = t;
 897 a487c1d0 2018-01-14 stsp 	*size = s;
 898 a487c1d0 2018-01-14 stsp 	return NULL;
 899 0a0a3048 2018-01-10 stsp }
 900 c54542a0 2018-01-13 stsp 
 901 a1fd68d8 2018-01-12 stsp static const struct got_error *
 902 5f25cc85 2019-11-26 stsp open_plain_object(struct got_object **obj, struct got_object_id *id,
 903 5f25cc85 2019-11-26 stsp     uint8_t type, off_t offset, size_t size, int idx)
 904 6ccb713b 2018-01-19 stsp {
 905 6ccb713b 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
 906 6ccb713b 2018-01-19 stsp 	if (*obj == NULL)
 907 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 908 6ccb713b 2018-01-19 stsp 
 909 6ccb713b 2018-01-19 stsp 	(*obj)->type = type;
 910 6ccb713b 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
 911 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
 912 6ccb713b 2018-01-19 stsp 	(*obj)->hdrlen = 0;
 913 6ccb713b 2018-01-19 stsp 	(*obj)->size = size;
 914 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
 915 6ccb713b 2018-01-19 stsp 	(*obj)->pack_offset = offset;
 916 b107e67f 2018-01-19 stsp 
 917 b107e67f 2018-01-19 stsp 	return NULL;
 918 b107e67f 2018-01-19 stsp }
 919 b107e67f 2018-01-19 stsp 
 920 b107e67f 2018-01-19 stsp static const struct got_error *
 921 d7464085 2018-07-09 stsp parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
 922 d7464085 2018-07-09 stsp     off_t delta_offset)
 923 b107e67f 2018-01-19 stsp {
 924 b107e67f 2018-01-19 stsp 	int64_t o = 0;
 925 b107e67f 2018-01-19 stsp 	uint8_t offN;
 926 b107e67f 2018-01-19 stsp 	int i = 0;
 927 b107e67f 2018-01-19 stsp 
 928 a0de39f3 2019-08-09 stsp 	*offset = 0;
 929 d7464085 2018-07-09 stsp 	*len = 0;
 930 d7464085 2018-07-09 stsp 
 931 b107e67f 2018-01-19 stsp 	do {
 932 b107e67f 2018-01-19 stsp 		/* We do not support offset values which don't fit in 64 bit. */
 933 b107e67f 2018-01-19 stsp 		if (i > 8)
 934 b107e67f 2018-01-19 stsp 			return got_error(GOT_ERR_NO_SPACE);
 935 b107e67f 2018-01-19 stsp 
 936 d7464085 2018-07-09 stsp 		if (pack->map) {
 937 d7464085 2018-07-09 stsp 			size_t mapoff;
 938 d7464085 2018-07-09 stsp 			mapoff = (size_t)delta_offset + *len;
 939 3976db15 2022-01-10 stsp 			if (mapoff + sizeof(offN) >= pack->filesize)
 940 3976db15 2022-01-10 stsp 				return got_error(GOT_ERR_PACK_OFFSET);
 941 d7464085 2018-07-09 stsp 			offN = *(pack->map + mapoff);
 942 d7464085 2018-07-09 stsp 		} else {
 943 d7464085 2018-07-09 stsp 			ssize_t n;
 944 d7464085 2018-07-09 stsp 			n = read(pack->fd, &offN, sizeof(offN));
 945 d7464085 2018-07-09 stsp 			if (n < 0)
 946 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 947 d7464085 2018-07-09 stsp 			if (n != sizeof(offN))
 948 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 949 d7464085 2018-07-09 stsp 		}
 950 d7464085 2018-07-09 stsp 		*len += sizeof(offN);
 951 b107e67f 2018-01-19 stsp 
 952 b107e67f 2018-01-19 stsp 		if (i == 0)
 953 b107e67f 2018-01-19 stsp 			o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 954 b107e67f 2018-01-19 stsp 		else {
 955 cecc778e 2018-01-23 stsp 			o++;
 956 b107e67f 2018-01-19 stsp 			o <<= 7;
 957 cecc778e 2018-01-23 stsp 			o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
 958 b107e67f 2018-01-19 stsp 		}
 959 b107e67f 2018-01-19 stsp 		i++;
 960 b107e67f 2018-01-19 stsp 	} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
 961 6ccb713b 2018-01-19 stsp 
 962 b107e67f 2018-01-19 stsp 	*offset = o;
 963 6ccb713b 2018-01-19 stsp 	return NULL;
 964 6ccb713b 2018-01-19 stsp }
 965 6ccb713b 2018-01-19 stsp 
 966 668a20f6 2020-03-18 stsp const struct got_error *
 967 c0df5966 2021-12-31 stsp got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
 968 24d916d2 2022-10-24 op     struct got_pack *pack, off_t offset, size_t tslen)
 969 b107e67f 2018-01-19 stsp {
 970 96f5e8b3 2018-01-23 stsp 	const struct got_error *err;
 971 b107e67f 2018-01-19 stsp 	int64_t negoffset;
 972 b107e67f 2018-01-19 stsp 	size_t negofflen;
 973 b107e67f 2018-01-19 stsp 
 974 d7464085 2018-07-09 stsp 	*len = 0;
 975 d7464085 2018-07-09 stsp 
 976 d7464085 2018-07-09 stsp 	err = parse_negative_offset(&negoffset, &negofflen, pack,
 977 d7464085 2018-07-09 stsp 	    offset + tslen);
 978 b107e67f 2018-01-19 stsp 	if (err)
 979 b107e67f 2018-01-19 stsp 		return err;
 980 b107e67f 2018-01-19 stsp 
 981 b107e67f 2018-01-19 stsp 	/* Compute the base object's offset (must be in the same pack file). */
 982 96f5e8b3 2018-01-23 stsp 	*base_offset = (offset - negoffset);
 983 96f5e8b3 2018-01-23 stsp 	if (*base_offset <= 0)
 984 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_BAD_PACKFILE);
 985 b107e67f 2018-01-19 stsp 
 986 d7464085 2018-07-09 stsp 	*len = negofflen;
 987 96f5e8b3 2018-01-23 stsp 	return NULL;
 988 96f5e8b3 2018-01-23 stsp }
 989 96f5e8b3 2018-01-23 stsp 
 990 0e22967e 2018-02-11 stsp static const struct got_error *
 991 42c69117 2019-11-10 stsp read_delta_data(uint8_t **delta_buf, size_t *delta_len,
 992 2d9e6abf 2022-05-04 stsp     size_t *delta_compressed_len, size_t delta_data_offset,
 993 2d9e6abf 2022-05-04 stsp     struct got_pack *pack)
 994 42c69117 2019-11-10 stsp {
 995 42c69117 2019-11-10 stsp 	const struct got_error *err = NULL;
 996 2d9e6abf 2022-05-04 stsp 	size_t consumed = 0;
 997 42c69117 2019-11-10 stsp 
 998 42c69117 2019-11-10 stsp 	if (pack->map) {
 999 42c69117 2019-11-10 stsp 		if (delta_data_offset >= pack->filesize)
1000 42c69117 2019-11-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1001 2e5a6fad 2020-03-18 stsp 		err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1002 2d9e6abf 2022-05-04 stsp 		    &consumed, NULL, pack->map, delta_data_offset,
1003 2e5a6fad 2020-03-18 stsp 		    pack->filesize - delta_data_offset);
1004 2d9e6abf 2022-05-04 stsp 		if (err)
1005 2d9e6abf 2022-05-04 stsp 			return err;
1006 42c69117 2019-11-10 stsp 	} else {
1007 42c69117 2019-11-10 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1008 42c69117 2019-11-10 stsp 			return got_error_from_errno("lseek");
1009 2d9e6abf 2022-05-04 stsp 		err = got_inflate_to_mem_fd(delta_buf, delta_len,
1010 2d9e6abf 2022-05-04 stsp 		    &consumed, NULL, 0, pack->fd);
1011 2d9e6abf 2022-05-04 stsp 		if (err)
1012 2d9e6abf 2022-05-04 stsp 			return err;
1013 42c69117 2019-11-10 stsp 	}
1014 2d9e6abf 2022-05-04 stsp 
1015 2d9e6abf 2022-05-04 stsp 	if (delta_compressed_len)
1016 2d9e6abf 2022-05-04 stsp 		*delta_compressed_len = consumed;
1017 2d9e6abf 2022-05-04 stsp 
1018 2d9e6abf 2022-05-04 stsp 	return NULL;
1019 42c69117 2019-11-10 stsp }
1020 a3500804 2018-01-23 stsp 
1021 96f5e8b3 2018-01-23 stsp static const struct got_error *
1022 c336f889 2018-07-23 stsp add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1023 42c69117 2019-11-10 stsp     int delta_type, size_t delta_size, size_t delta_data_offset)
1024 bdd2fbb3 2018-02-11 stsp {
1025 bdd2fbb3 2018-02-11 stsp 	struct got_delta *delta;
1026 bdd2fbb3 2018-02-11 stsp 
1027 c336f889 2018-07-23 stsp 	delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1028 42c69117 2019-11-10 stsp 	    delta_data_offset);
1029 bdd2fbb3 2018-02-11 stsp 	if (delta == NULL)
1030 638f9024 2019-05-13 stsp 		return got_error_from_errno("got_delta_open");
1031 bdd2fbb3 2018-02-11 stsp 	/* delta is freed in got_object_close() */
1032 bdd2fbb3 2018-02-11 stsp 	deltas->nentries++;
1033 dbdddfee 2021-06-23 naddy 	STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1034 bdd2fbb3 2018-02-11 stsp 	return NULL;
1035 bdd2fbb3 2018-02-11 stsp }
1036 bdd2fbb3 2018-02-11 stsp 
1037 bdd2fbb3 2018-02-11 stsp static const struct got_error *
1038 6b9c9673 2018-01-23 stsp resolve_offset_delta(struct got_delta_chain *deltas,
1039 c8ecd499 2018-09-09 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1040 c8ecd499 2018-09-09 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1041 a3500804 2018-01-23 stsp {
1042 a3500804 2018-01-23 stsp 	const struct got_error *err;
1043 c3703302 2018-01-23 stsp 	off_t base_offset;
1044 c3703302 2018-01-23 stsp 	uint8_t base_type;
1045 c3703302 2018-01-23 stsp 	uint64_t base_size;
1046 c3703302 2018-01-23 stsp 	size_t base_tslen;
1047 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1048 42c69117 2019-11-10 stsp 	size_t consumed;
1049 a3500804 2018-01-23 stsp 
1050 668a20f6 2020-03-18 stsp 	err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1051 d7464085 2018-07-09 stsp 	    delta_offset, tslen);
1052 a3500804 2018-01-23 stsp 	if (err)
1053 a3500804 2018-01-23 stsp 		return err;
1054 a3500804 2018-01-23 stsp 
1055 d7464085 2018-07-09 stsp 	delta_data_offset = delta_offset + tslen + consumed;
1056 d7464085 2018-07-09 stsp 	if (delta_data_offset >= pack->filesize)
1057 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1058 a53d2f13 2018-03-17 stsp 
1059 d7464085 2018-07-09 stsp 	if (pack->map == NULL) {
1060 d7464085 2018-07-09 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1061 d7464085 2018-07-09 stsp 		if (delta_data_offset == -1)
1062 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
1063 d7464085 2018-07-09 stsp 	}
1064 bdd2fbb3 2018-02-11 stsp 
1065 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1066 42c69117 2019-11-10 stsp 	    delta_data_offset);
1067 bdd2fbb3 2018-02-11 stsp 	if (err)
1068 1a35c1bc 2019-05-22 stsp 		return err;
1069 bdd2fbb3 2018-02-11 stsp 
1070 c3703302 2018-01-23 stsp 	/* An offset delta must be in the same packfile. */
1071 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1072 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1073 b107e67f 2018-01-19 stsp 
1074 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1075 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1076 b107e67f 2018-01-19 stsp 	if (err)
1077 1a35c1bc 2019-05-22 stsp 		return err;
1078 b107e67f 2018-01-19 stsp 
1079 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1080 b0e2201a 2018-06-22 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1081 c3703302 2018-01-23 stsp }
1082 c4330eff 2021-06-22 stsp 
1083 c4330eff 2021-06-22 stsp const struct got_error *
1084 c4330eff 2021-06-22 stsp got_pack_parse_ref_delta(struct got_object_id *id,
1085 c4330eff 2021-06-22 stsp     struct got_pack *pack, off_t delta_offset, int tslen)
1086 c4330eff 2021-06-22 stsp {
1087 c4330eff 2021-06-22 stsp 	if (pack->map) {
1088 c4330eff 2021-06-22 stsp 		size_t mapoff = delta_offset + tslen;
1089 3976db15 2022-01-10 stsp 		if (mapoff + sizeof(*id) >= pack->filesize)
1090 3976db15 2022-01-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1091 c4330eff 2021-06-22 stsp 		memcpy(id, pack->map + mapoff, sizeof(*id));
1092 c4330eff 2021-06-22 stsp 	} else {
1093 c4330eff 2021-06-22 stsp 		ssize_t n;
1094 c4330eff 2021-06-22 stsp 		n = read(pack->fd, id, sizeof(*id));
1095 c4330eff 2021-06-22 stsp 		if (n < 0)
1096 c4330eff 2021-06-22 stsp 			return got_error_from_errno("read");
1097 c4330eff 2021-06-22 stsp 		if (n != sizeof(*id))
1098 c4330eff 2021-06-22 stsp 			return got_error(GOT_ERR_BAD_PACKFILE);
1099 c4330eff 2021-06-22 stsp 	}
1100 c3703302 2018-01-23 stsp 
1101 c4330eff 2021-06-22 stsp 	return NULL;
1102 c4330eff 2021-06-22 stsp }
1103 c4330eff 2021-06-22 stsp 
1104 c3703302 2018-01-23 stsp static const struct got_error *
1105 c8ecd499 2018-09-09 stsp resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1106 c8ecd499 2018-09-09 stsp     struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1107 c8ecd499 2018-09-09 stsp     size_t delta_size, unsigned int recursion)
1108 c3703302 2018-01-23 stsp {
1109 6b9c9673 2018-01-23 stsp 	const struct got_error *err;
1110 6b9c9673 2018-01-23 stsp 	struct got_object_id id;
1111 6b9c9673 2018-01-23 stsp 	int idx;
1112 6b9c9673 2018-01-23 stsp 	off_t base_offset;
1113 6b9c9673 2018-01-23 stsp 	uint8_t base_type;
1114 6b9c9673 2018-01-23 stsp 	uint64_t base_size;
1115 6b9c9673 2018-01-23 stsp 	size_t base_tslen;
1116 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1117 6b9c9673 2018-01-23 stsp 
1118 42c69117 2019-11-10 stsp 	if (delta_offset + tslen >= pack->filesize)
1119 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1120 a53d2f13 2018-03-17 stsp 
1121 c4330eff 2021-06-22 stsp 	err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1122 c4330eff 2021-06-22 stsp 	if (err)
1123 c4330eff 2021-06-22 stsp 		return err;
1124 d7464085 2018-07-09 stsp 	if (pack->map) {
1125 c4330eff 2021-06-22 stsp 		delta_data_offset = delta_offset + tslen + sizeof(id);
1126 d7464085 2018-07-09 stsp 	} else {
1127 e40b19ed 2020-01-06 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1128 e40b19ed 2020-01-06 stsp 		if (delta_data_offset == -1)
1129 e40b19ed 2020-01-06 stsp 			return got_error_from_errno("lseek");
1130 d7464085 2018-07-09 stsp 	}
1131 d7464085 2018-07-09 stsp 
1132 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1133 42c69117 2019-11-10 stsp 	    delta_data_offset);
1134 bdd2fbb3 2018-02-11 stsp 	if (err)
1135 1a35c1bc 2019-05-22 stsp 		return err;
1136 bdd2fbb3 2018-02-11 stsp 
1137 652b2703 2018-06-22 stsp 	/* Delta base must be in the same pack file. */
1138 1510f469 2018-09-09 stsp 	idx = got_packidx_get_object_idx(packidx, &id);
1139 1a35c1bc 2019-05-22 stsp 	if (idx == -1)
1140 668a20f6 2020-03-18 stsp 		return got_error(GOT_ERR_NO_OBJ);
1141 6b9c9673 2018-01-23 stsp 
1142 02828bfd 2021-06-22 stsp 	base_offset = got_packidx_get_object_offset(packidx, idx);
1143 04aed155 2022-07-24 naddy 	if (base_offset == -1)
1144 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1145 6b9c9673 2018-01-23 stsp 
1146 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1147 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1148 6b9c9673 2018-01-23 stsp 
1149 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1150 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1151 6b9c9673 2018-01-23 stsp 	if (err)
1152 1a35c1bc 2019-05-22 stsp 		return err;
1153 6b9c9673 2018-01-23 stsp 
1154 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1155 0c048b15 2018-04-27 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1156 6b9c9673 2018-01-23 stsp }
1157 6b9c9673 2018-01-23 stsp 
1158 668a20f6 2020-03-18 stsp const struct got_error *
1159 668a20f6 2020-03-18 stsp got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1160 668a20f6 2020-03-18 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1161 668a20f6 2020-03-18 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1162 6b9c9673 2018-01-23 stsp {
1163 c3703302 2018-01-23 stsp 	const struct got_error *err = NULL;
1164 c3703302 2018-01-23 stsp 
1165 5b7e13a7 2018-04-02 stsp 	if (--recursion == 0)
1166 5b7e13a7 2018-04-02 stsp 		return got_error(GOT_ERR_RECURSION);
1167 5b7e13a7 2018-04-02 stsp 
1168 c3703302 2018-01-23 stsp 	switch (delta_type) {
1169 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_COMMIT:
1170 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TREE:
1171 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_BLOB:
1172 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TAG:
1173 c3703302 2018-01-23 stsp 		/* Plain types are the final delta base. Recursion ends. */
1174 c336f889 2018-07-23 stsp 		err = add_delta(deltas, delta_offset, tslen, delta_type,
1175 42c69117 2019-11-10 stsp 		    delta_size, 0);
1176 4e8cda55 2018-01-19 stsp 		break;
1177 a3500804 2018-01-23 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1178 c8ecd499 2018-09-09 stsp 		err = resolve_offset_delta(deltas, packidx, pack,
1179 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1180 96f5e8b3 2018-01-23 stsp 		break;
1181 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1182 c8ecd499 2018-09-09 stsp 		err = resolve_ref_delta(deltas, packidx, pack,
1183 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1184 6b9c9673 2018-01-23 stsp 		break;
1185 4e8cda55 2018-01-19 stsp 	default:
1186 4810de4a 2018-04-01 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1187 4e8cda55 2018-01-19 stsp 	}
1188 96f5e8b3 2018-01-23 stsp 
1189 96f5e8b3 2018-01-23 stsp 	return err;
1190 96f5e8b3 2018-01-23 stsp }
1191 96f5e8b3 2018-01-23 stsp 
1192 96f5e8b3 2018-01-23 stsp static const struct got_error *
1193 a98c62b1 2018-09-09 stsp open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1194 a98c62b1 2018-09-09 stsp     struct got_pack *pack, struct got_object_id *id, off_t offset,
1195 c59b3346 2018-09-11 stsp     size_t tslen, int delta_type, size_t delta_size, int idx)
1196 96f5e8b3 2018-01-23 stsp {
1197 96f5e8b3 2018-01-23 stsp 	const struct got_error *err = NULL;
1198 96f5e8b3 2018-01-23 stsp 	int resolved_type;
1199 4e8cda55 2018-01-19 stsp 
1200 b107e67f 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
1201 b107e67f 2018-01-19 stsp 	if (*obj == NULL)
1202 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
1203 b107e67f 2018-01-19 stsp 
1204 96f5e8b3 2018-01-23 stsp 	(*obj)->flags = 0;
1205 b107e67f 2018-01-19 stsp 	(*obj)->hdrlen = 0;
1206 39e73dc9 2018-03-03 stsp 	(*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1207 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1208 cecc778e 2018-01-23 stsp 	(*obj)->pack_offset = offset + tslen;
1209 1a35c1bc 2019-05-22 stsp 
1210 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(&(*obj)->deltas.entries);
1211 1a35c1bc 2019-05-22 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1212 96f5e8b3 2018-01-23 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1213 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
1214 96f5e8b3 2018-01-23 stsp 
1215 668a20f6 2020-03-18 stsp 	err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1216 668a20f6 2020-03-18 stsp 	    offset, tslen, delta_type, delta_size,
1217 668a20f6 2020-03-18 stsp 	    GOT_DELTA_CHAIN_RECURSION_MAX);
1218 96f5e8b3 2018-01-23 stsp 	if (err)
1219 96f5e8b3 2018-01-23 stsp 		goto done;
1220 96f5e8b3 2018-01-23 stsp 
1221 96f5e8b3 2018-01-23 stsp 	err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1222 96f5e8b3 2018-01-23 stsp 	if (err)
1223 96f5e8b3 2018-01-23 stsp 		goto done;
1224 96f5e8b3 2018-01-23 stsp 	(*obj)->type = resolved_type;
1225 96f5e8b3 2018-01-23 stsp done:
1226 96f5e8b3 2018-01-23 stsp 	if (err) {
1227 96f5e8b3 2018-01-23 stsp 		got_object_close(*obj);
1228 96f5e8b3 2018-01-23 stsp 		*obj = NULL;
1229 96f5e8b3 2018-01-23 stsp 	}
1230 96f5e8b3 2018-01-23 stsp 	return err;
1231 b107e67f 2018-01-19 stsp }
1232 b107e67f 2018-01-19 stsp 
1233 2090a03d 2018-09-09 stsp const struct got_error *
1234 2090a03d 2018-09-09 stsp got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1235 6fd11751 2018-06-04 stsp     struct got_packidx *packidx, int idx, struct got_object_id *id)
1236 a1fd68d8 2018-01-12 stsp {
1237 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
1238 a1fd68d8 2018-01-12 stsp 	off_t offset;
1239 6c00b545 2018-01-17 stsp 	uint8_t type;
1240 6c00b545 2018-01-17 stsp 	uint64_t size;
1241 3ee5fc21 2018-01-17 stsp 	size_t tslen;
1242 a1fd68d8 2018-01-12 stsp 
1243 6c00b545 2018-01-17 stsp 	*obj = NULL;
1244 a1fd68d8 2018-01-12 stsp 
1245 02828bfd 2021-06-22 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1246 04aed155 2022-07-24 naddy 	if (offset == -1)
1247 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1248 a1fd68d8 2018-01-12 stsp 
1249 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1250 668a20f6 2020-03-18 stsp 	    pack, offset);
1251 a1fd68d8 2018-01-12 stsp 	if (err)
1252 35c73765 2018-09-09 stsp 		return err;
1253 a1fd68d8 2018-01-12 stsp 
1254 6c00b545 2018-01-17 stsp 	switch (type) {
1255 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
1256 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
1257 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
1258 d33fc9ef 2018-01-23 stsp 	case GOT_OBJ_TYPE_TAG:
1259 5f25cc85 2019-11-26 stsp 		err = open_plain_object(obj, id, type, offset + tslen,
1260 5f25cc85 2019-11-26 stsp 		    size, idx);
1261 6c00b545 2018-01-17 stsp 		break;
1262 b107e67f 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1263 a48db7e5 2018-01-23 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1264 a98c62b1 2018-09-09 stsp 		err = open_delta_object(obj, packidx, pack, id, offset,
1265 c59b3346 2018-09-11 stsp 		    tslen, type, size, idx);
1266 b107e67f 2018-01-19 stsp 		break;
1267 6c00b545 2018-01-17 stsp 	default:
1268 4810de4a 2018-04-01 stsp 		err = got_error(GOT_ERR_OBJ_TYPE);
1269 35c73765 2018-09-09 stsp 		break;
1270 35c73765 2018-09-09 stsp 	}
1271 35c73765 2018-09-09 stsp 
1272 3ee5fc21 2018-01-17 stsp 	return err;
1273 3ee5fc21 2018-01-17 stsp }
1274 efd2a263 2018-01-19 stsp 
1275 d582f26c 2020-03-18 stsp const struct got_error *
1276 c0df5966 2021-12-31 stsp got_pack_get_delta_chain_max_size(uint64_t *max_size,
1277 c0df5966 2021-12-31 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1278 22484865 2018-03-13 stsp {
1279 22484865 2018-03-13 stsp 	struct got_delta *delta;
1280 22484865 2018-03-13 stsp 	uint64_t base_size = 0, result_size = 0;
1281 22484865 2018-03-13 stsp 
1282 22484865 2018-03-13 stsp 	*max_size = 0;
1283 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1284 22484865 2018-03-13 stsp 		/* Plain object types are the delta base. */
1285 22484865 2018-03-13 stsp 		if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1286 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TREE &&
1287 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_BLOB &&
1288 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TAG) {
1289 22484865 2018-03-13 stsp 			const struct got_error *err;
1290 aabb25f8 2022-10-17 stsp 			uint8_t *delta_buf = NULL;
1291 42c69117 2019-11-10 stsp 			size_t delta_len;
1292 ab2f42e7 2019-11-10 stsp 			int cached = 1;
1293 42c69117 2019-11-10 stsp 
1294 aabb25f8 2022-10-17 stsp 			if (pack->delta_cache) {
1295 aabb25f8 2022-10-17 stsp 				got_delta_cache_get(&delta_buf, &delta_len,
1296 aabb25f8 2022-10-17 stsp 				    pack->delta_cache, delta->data_offset);
1297 aabb25f8 2022-10-17 stsp 			}
1298 ab2f42e7 2019-11-10 stsp 			if (delta_buf == NULL) {
1299 ab2f42e7 2019-11-10 stsp 				cached = 0;
1300 ab2f42e7 2019-11-10 stsp 				err = read_delta_data(&delta_buf, &delta_len,
1301 2d9e6abf 2022-05-04 stsp 				    NULL, delta->data_offset, pack);
1302 ab2f42e7 2019-11-10 stsp 				if (err)
1303 ab2f42e7 2019-11-10 stsp 					return err;
1304 aabb25f8 2022-10-17 stsp 			}
1305 aabb25f8 2022-10-17 stsp 			if (pack->delta_cache && !cached) {
1306 ab2f42e7 2019-11-10 stsp 				err = got_delta_cache_add(pack->delta_cache,
1307 ab2f42e7 2019-11-10 stsp 				    delta->data_offset, delta_buf, delta_len);
1308 ab2f42e7 2019-11-10 stsp 				if (err == NULL)
1309 ab2f42e7 2019-11-10 stsp 					cached = 1;
1310 ab2f42e7 2019-11-10 stsp 				else if (err->code != GOT_ERR_NO_SPACE) {
1311 ab2f42e7 2019-11-10 stsp 					free(delta_buf);
1312 ab2f42e7 2019-11-10 stsp 					return err;
1313 ab2f42e7 2019-11-10 stsp 				}
1314 ab2f42e7 2019-11-10 stsp 			}
1315 a53d2f13 2018-03-17 stsp 			err = got_delta_get_sizes(&base_size, &result_size,
1316 42c69117 2019-11-10 stsp 			    delta_buf, delta_len);
1317 ab2f42e7 2019-11-10 stsp 			if (!cached)
1318 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1319 22484865 2018-03-13 stsp 			if (err)
1320 22484865 2018-03-13 stsp 				return err;
1321 22484865 2018-03-13 stsp 		} else
1322 22484865 2018-03-13 stsp 			base_size = delta->size;
1323 22484865 2018-03-13 stsp 		if (base_size > *max_size)
1324 22484865 2018-03-13 stsp 			*max_size = base_size;
1325 22484865 2018-03-13 stsp 		if (result_size > *max_size)
1326 22484865 2018-03-13 stsp 			*max_size = result_size;
1327 22484865 2018-03-13 stsp 	}
1328 bd1223b9 2018-03-14 stsp 
1329 9feb4ff2 2018-03-14 stsp 	return NULL;
1330 ac544f8c 2019-01-13 stsp }
1331 ac544f8c 2019-01-13 stsp 
1332 ac544f8c 2019-01-13 stsp const struct got_error *
1333 42c69117 2019-11-10 stsp got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1334 42c69117 2019-11-10 stsp     struct got_pack *pack)
1335 ac544f8c 2019-01-13 stsp {
1336 85a703fa 2019-01-13 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1337 85a703fa 2019-01-13 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1338 85a703fa 2019-01-13 stsp 
1339 d582f26c 2020-03-18 stsp 	return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1340 22484865 2018-03-13 stsp }
1341 22484865 2018-03-13 stsp 
1342 668a20f6 2020-03-18 stsp const struct got_error *
1343 4788f1ce 2020-03-18 stsp got_pack_dump_delta_chain_to_file(size_t *result_size,
1344 4788f1ce 2020-03-18 stsp     struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1345 4788f1ce 2020-03-18 stsp     FILE *base_file, FILE *accum_file)
1346 efd2a263 2018-01-19 stsp {
1347 efd2a263 2018-01-19 stsp 	const struct got_error *err = NULL;
1348 6691714a 2018-01-23 stsp 	struct got_delta *delta;
1349 aabb25f8 2022-10-17 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1350 6395114c 2022-05-31 stsp 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1351 6395114c 2022-05-31 stsp 	/* We process small enough files entirely in memory for speed. */
1352 6395114c 2022-05-31 stsp 	const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1353 6395114c 2022-05-31 stsp 	uint64_t max_size = 0;
1354 6691714a 2018-01-23 stsp 	int n = 0;
1355 b29656e2 2018-03-16 stsp 
1356 b29656e2 2018-03-16 stsp 	*result_size = 0;
1357 3ee5fc21 2018-01-17 stsp 
1358 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1359 6691714a 2018-01-23 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1360 efd2a263 2018-01-19 stsp 
1361 6395114c 2022-05-31 stsp 	if (fseeko(base_file, 0L, SEEK_SET) == -1)
1362 6395114c 2022-05-31 stsp 		return got_error_from_errno("fseeko");
1363 6395114c 2022-05-31 stsp 	if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1364 6395114c 2022-05-31 stsp 		return got_error_from_errno("fseeko");
1365 efd2a263 2018-01-19 stsp 
1366 6691714a 2018-01-23 stsp 	/* Deltas are ordered in ascending order. */
1367 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1368 aabb25f8 2022-10-17 stsp 		uint8_t *delta_buf = NULL;
1369 6395114c 2022-05-31 stsp 		uint64_t base_size, result_size = 0;
1370 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1371 a6b158cc 2018-02-11 stsp 		if (n == 0) {
1372 34fca9c3 2018-11-11 stsp 			size_t mapoff;
1373 0c048b15 2018-04-27 stsp 			off_t delta_data_offset;
1374 9db65d41 2018-03-14 stsp 
1375 a6b158cc 2018-02-11 stsp 			/* Plain object types are the delta base. */
1376 a6b158cc 2018-02-11 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1377 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1378 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1379 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1380 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1381 72eb3431 2018-04-01 stsp 				goto done;
1382 72eb3431 2018-04-01 stsp 			}
1383 72eb3431 2018-04-01 stsp 
1384 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1385 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1386 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1387 0c048b15 2018-04-27 stsp 				goto done;
1388 0c048b15 2018-04-27 stsp 			}
1389 d7464085 2018-07-09 stsp 			if (pack->map == NULL) {
1390 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1391 d7464085 2018-07-09 stsp 				    == -1) {
1392 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1393 d7464085 2018-07-09 stsp 					goto done;
1394 d7464085 2018-07-09 stsp 				}
1395 bdd2fbb3 2018-02-11 stsp 			}
1396 6395114c 2022-05-31 stsp 			if (delta->size > max_size)
1397 6395114c 2022-05-31 stsp 				max_size = delta->size;
1398 6395114c 2022-05-31 stsp 			if (max_size > max_bufsize) {
1399 d7464085 2018-07-09 stsp 				if (pack->map) {
1400 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1401 d7464085 2018-07-09 stsp 					err = got_inflate_to_file_mmap(
1402 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->map,
1403 4788f1ce 2020-03-18 stsp 					    mapoff, pack->filesize - mapoff,
1404 4788f1ce 2020-03-18 stsp 					    base_file);
1405 d7464085 2018-07-09 stsp 				} else
1406 34fca9c3 2018-11-11 stsp 					err = got_inflate_to_file_fd(
1407 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->fd,
1408 4788f1ce 2020-03-18 stsp 					    base_file);
1409 d7464085 2018-07-09 stsp 			} else {
1410 6395114c 2022-05-31 stsp 				accum_buf = malloc(max_size);
1411 6395114c 2022-05-31 stsp 				if (accum_buf == NULL) {
1412 6395114c 2022-05-31 stsp 					err = got_error_from_errno("malloc");
1413 6395114c 2022-05-31 stsp 					goto done;
1414 6395114c 2022-05-31 stsp 				}
1415 6395114c 2022-05-31 stsp 				accum_bufsz = max_size;
1416 d7464085 2018-07-09 stsp 				if (pack->map) {
1417 d7464085 2018-07-09 stsp 					mapoff = (size_t)delta_data_offset;
1418 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_mmap(&base_buf,
1419 2e5a6fad 2020-03-18 stsp 					    &base_bufsz, NULL, NULL,
1420 2e5a6fad 2020-03-18 stsp 					    pack->map, mapoff,
1421 d7464085 2018-07-09 stsp 					    pack->filesize - mapoff);
1422 d7464085 2018-07-09 stsp 				} else
1423 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_fd(&base_buf,
1424 55fdd257 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, max_size,
1425 55fdd257 2020-03-18 stsp 					    pack->fd);
1426 8628c62d 2018-03-15 stsp 			}
1427 a6b158cc 2018-02-11 stsp 			if (err)
1428 a6b158cc 2018-02-11 stsp 				goto done;
1429 a6b158cc 2018-02-11 stsp 			n++;
1430 6395114c 2022-05-31 stsp 			if (base_buf == NULL)
1431 8628c62d 2018-03-15 stsp 				rewind(base_file);
1432 a6b158cc 2018-02-11 stsp 			continue;
1433 9db65d41 2018-03-14 stsp 		}
1434 885d3e02 2018-01-27 stsp 
1435 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache) {
1436 aabb25f8 2022-10-17 stsp 			got_delta_cache_get(&delta_buf, &delta_len,
1437 aabb25f8 2022-10-17 stsp 			    pack->delta_cache, delta->data_offset);
1438 aabb25f8 2022-10-17 stsp 		}
1439 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1440 ab2f42e7 2019-11-10 stsp 			cached = 0;
1441 2d9e6abf 2022-05-04 stsp 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1442 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1443 ab2f42e7 2019-11-10 stsp 			if (err)
1444 ab2f42e7 2019-11-10 stsp 				goto done;
1445 aabb25f8 2022-10-17 stsp 		}
1446 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache && !cached) {
1447 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1448 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1449 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1450 ab2f42e7 2019-11-10 stsp 				cached = 1;
1451 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1452 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1453 ab2f42e7 2019-11-10 stsp 				goto done;
1454 ab2f42e7 2019-11-10 stsp 			}
1455 ab2f42e7 2019-11-10 stsp 		}
1456 6395114c 2022-05-31 stsp 
1457 6395114c 2022-05-31 stsp 		err = got_delta_get_sizes(&base_size, &result_size,
1458 6395114c 2022-05-31 stsp 		    delta_buf, delta_len);
1459 6395114c 2022-05-31 stsp 		if (err)
1460 6395114c 2022-05-31 stsp 			goto done;
1461 6395114c 2022-05-31 stsp 		if (base_size > max_size)
1462 6395114c 2022-05-31 stsp 			max_size = base_size;
1463 6395114c 2022-05-31 stsp 		if (result_size > max_size)
1464 6395114c 2022-05-31 stsp 			max_size = result_size;
1465 6395114c 2022-05-31 stsp 
1466 6395114c 2022-05-31 stsp 		if (base_buf && max_size > max_bufsize) {
1467 6395114c 2022-05-31 stsp 			/* Switch from buffers to temporary files. */
1468 6395114c 2022-05-31 stsp 			size_t w = fwrite(base_buf, 1, base_bufsz,
1469 6395114c 2022-05-31 stsp 			    base_file);
1470 6395114c 2022-05-31 stsp 			if (w != base_bufsz) {
1471 6395114c 2022-05-31 stsp 				err = got_ferror(outfile, GOT_ERR_IO);
1472 6395114c 2022-05-31 stsp 				goto done;
1473 6395114c 2022-05-31 stsp 			}
1474 6395114c 2022-05-31 stsp 			free(base_buf);
1475 6395114c 2022-05-31 stsp 			base_buf = NULL;
1476 6395114c 2022-05-31 stsp 			free(accum_buf);
1477 6395114c 2022-05-31 stsp 			accum_buf = NULL;
1478 6395114c 2022-05-31 stsp 		}
1479 6395114c 2022-05-31 stsp 
1480 6395114c 2022-05-31 stsp 		if (base_buf && max_size > base_bufsz) {
1481 6395114c 2022-05-31 stsp 			uint8_t *p = realloc(base_buf, max_size);
1482 6395114c 2022-05-31 stsp 			if (p == NULL) {
1483 6395114c 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1484 6395114c 2022-05-31 stsp 				goto done;
1485 6395114c 2022-05-31 stsp 			}
1486 6395114c 2022-05-31 stsp 			base_buf = p;
1487 6395114c 2022-05-31 stsp 			base_bufsz = max_size;
1488 6395114c 2022-05-31 stsp 		}
1489 6395114c 2022-05-31 stsp 
1490 6395114c 2022-05-31 stsp 		if (accum_buf && max_size > accum_bufsz) {
1491 6395114c 2022-05-31 stsp 			uint8_t *p = realloc(accum_buf, max_size);
1492 6395114c 2022-05-31 stsp 			if (p == NULL) {
1493 6395114c 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1494 6395114c 2022-05-31 stsp 				goto done;
1495 6395114c 2022-05-31 stsp 			}
1496 6395114c 2022-05-31 stsp 			accum_buf = p;
1497 6395114c 2022-05-31 stsp 			accum_bufsz = max_size;
1498 6395114c 2022-05-31 stsp 		}
1499 6395114c 2022-05-31 stsp 
1500 8628c62d 2018-03-15 stsp 		if (base_buf) {
1501 34fca9c3 2018-11-11 stsp 			err = got_delta_apply_in_mem(base_buf, base_bufsz,
1502 42c69117 2019-11-10 stsp 			    delta_buf, delta_len, accum_buf,
1503 34fca9c3 2018-11-11 stsp 			    &accum_size, max_size);
1504 8628c62d 2018-03-15 stsp 			n++;
1505 8628c62d 2018-03-15 stsp 		} else {
1506 42c69117 2019-11-10 stsp 			err = got_delta_apply(base_file, delta_buf,
1507 42c69117 2019-11-10 stsp 			    delta_len,
1508 8628c62d 2018-03-15 stsp 			    /* Final delta application writes to output file. */
1509 b29656e2 2018-03-16 stsp 			    ++n < deltas->nentries ? accum_file : outfile,
1510 b29656e2 2018-03-16 stsp 			    &accum_size);
1511 8628c62d 2018-03-15 stsp 		}
1512 ab2f42e7 2019-11-10 stsp 		if (!cached)
1513 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1514 6691714a 2018-01-23 stsp 		if (err)
1515 6691714a 2018-01-23 stsp 			goto done;
1516 6691714a 2018-01-23 stsp 
1517 710bb5ca 2018-01-23 stsp 		if (n < deltas->nentries) {
1518 6691714a 2018-01-23 stsp 			/* Accumulated delta becomes the new base. */
1519 8628c62d 2018-03-15 stsp 			if (base_buf) {
1520 8628c62d 2018-03-15 stsp 				uint8_t *tmp = accum_buf;
1521 6395114c 2022-05-31 stsp 				size_t tmp_size = accum_bufsz;
1522 8628c62d 2018-03-15 stsp 				accum_buf = base_buf;
1523 6395114c 2022-05-31 stsp 				accum_bufsz = base_bufsz;
1524 8628c62d 2018-03-15 stsp 				base_buf = tmp;
1525 6395114c 2022-05-31 stsp 				base_bufsz = tmp_size;
1526 8628c62d 2018-03-15 stsp 			} else {
1527 8628c62d 2018-03-15 stsp 				FILE *tmp = accum_file;
1528 8628c62d 2018-03-15 stsp 				accum_file = base_file;
1529 8628c62d 2018-03-15 stsp 				base_file = tmp;
1530 8628c62d 2018-03-15 stsp 				rewind(base_file);
1531 8628c62d 2018-03-15 stsp 				rewind(accum_file);
1532 8628c62d 2018-03-15 stsp 			}
1533 6691714a 2018-01-23 stsp 		}
1534 6691714a 2018-01-23 stsp 	}
1535 6691714a 2018-01-23 stsp 
1536 6691714a 2018-01-23 stsp done:
1537 8628c62d 2018-03-15 stsp 	free(base_buf);
1538 8628c62d 2018-03-15 stsp 	if (accum_buf) {
1539 8628c62d 2018-03-15 stsp 		size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1540 8628c62d 2018-03-15 stsp 		free(accum_buf);
1541 8628c62d 2018-03-15 stsp 		if (len != accum_size)
1542 673702af 2018-07-23 stsp 			err = got_ferror(outfile, GOT_ERR_IO);
1543 8628c62d 2018-03-15 stsp 	}
1544 6691714a 2018-01-23 stsp 	rewind(outfile);
1545 b29656e2 2018-03-16 stsp 	if (err == NULL)
1546 b29656e2 2018-03-16 stsp 		*result_size = accum_size;
1547 e0ab43e7 2018-03-16 stsp 	return err;
1548 e0ab43e7 2018-03-16 stsp }
1549 e0ab43e7 2018-03-16 stsp 
1550 668a20f6 2020-03-18 stsp const struct got_error *
1551 668a20f6 2020-03-18 stsp got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1552 48095039 2018-09-09 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1553 e0ab43e7 2018-03-16 stsp {
1554 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1555 e0ab43e7 2018-03-16 stsp 	struct got_delta *delta;
1556 aabb25f8 2022-10-17 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1557 f18c433a 2022-05-31 stsp 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1558 f18c433a 2022-05-31 stsp 	uint64_t max_size = 0;
1559 e0ab43e7 2018-03-16 stsp 	int n = 0;
1560 e0ab43e7 2018-03-16 stsp 
1561 e0ab43e7 2018-03-16 stsp 	*outbuf = NULL;
1562 e0ab43e7 2018-03-16 stsp 	*outlen = 0;
1563 e0ab43e7 2018-03-16 stsp 
1564 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1565 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1566 e0ab43e7 2018-03-16 stsp 
1567 e0ab43e7 2018-03-16 stsp 	/* Deltas are ordered in ascending order. */
1568 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1569 aabb25f8 2022-10-17 stsp 		uint8_t *delta_buf = NULL;
1570 f18c433a 2022-05-31 stsp 		uint64_t base_size, result_size = 0;
1571 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1572 e0ab43e7 2018-03-16 stsp 		if (n == 0) {
1573 0c048b15 2018-04-27 stsp 			size_t delta_data_offset;
1574 e0ab43e7 2018-03-16 stsp 
1575 e0ab43e7 2018-03-16 stsp 			/* Plain object types are the delta base. */
1576 e0ab43e7 2018-03-16 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1577 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1578 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1579 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1580 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1581 72eb3431 2018-04-01 stsp 				goto done;
1582 72eb3431 2018-04-01 stsp 			}
1583 72eb3431 2018-04-01 stsp 
1584 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1585 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1586 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1587 0c048b15 2018-04-27 stsp 				goto done;
1588 0c048b15 2018-04-27 stsp 			}
1589 f18c433a 2022-05-31 stsp 
1590 f18c433a 2022-05-31 stsp 			if (delta->size > max_size)
1591 f18c433a 2022-05-31 stsp 				max_size = delta->size;
1592 f18c433a 2022-05-31 stsp 
1593 d7464085 2018-07-09 stsp 			if (pack->map) {
1594 d7464085 2018-07-09 stsp 				size_t mapoff = (size_t)delta_data_offset;
1595 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_mmap(&base_buf,
1596 2e5a6fad 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, pack->map,
1597 2e5a6fad 2020-03-18 stsp 				    mapoff, pack->filesize - mapoff);
1598 d7464085 2018-07-09 stsp 			} else {
1599 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1600 d7464085 2018-07-09 stsp 				    == -1) {
1601 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1602 d7464085 2018-07-09 stsp 					goto done;
1603 d7464085 2018-07-09 stsp 				}
1604 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_fd(&base_buf,
1605 55fdd257 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, max_size,
1606 55fdd257 2020-03-18 stsp 				    pack->fd);
1607 e0ab43e7 2018-03-16 stsp 			}
1608 d7464085 2018-07-09 stsp 			if (err)
1609 d7464085 2018-07-09 stsp 				goto done;
1610 e0ab43e7 2018-03-16 stsp 			n++;
1611 e0ab43e7 2018-03-16 stsp 			continue;
1612 e0ab43e7 2018-03-16 stsp 		}
1613 e0ab43e7 2018-03-16 stsp 
1614 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache) {
1615 aabb25f8 2022-10-17 stsp 			got_delta_cache_get(&delta_buf, &delta_len,
1616 aabb25f8 2022-10-17 stsp 			    pack->delta_cache, delta->data_offset);
1617 aabb25f8 2022-10-17 stsp 		}
1618 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1619 ab2f42e7 2019-11-10 stsp 			cached = 0;
1620 2d9e6abf 2022-05-04 stsp 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1621 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1622 ab2f42e7 2019-11-10 stsp 			if (err)
1623 ab2f42e7 2019-11-10 stsp 				goto done;
1624 aabb25f8 2022-10-17 stsp 		}
1625 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache && !cached) {
1626 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1627 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1628 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1629 ab2f42e7 2019-11-10 stsp 				cached = 1;
1630 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1631 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1632 ab2f42e7 2019-11-10 stsp 				goto done;
1633 ab2f42e7 2019-11-10 stsp 			}
1634 ab2f42e7 2019-11-10 stsp 		}
1635 f18c433a 2022-05-31 stsp 
1636 f18c433a 2022-05-31 stsp 		err = got_delta_get_sizes(&base_size, &result_size,
1637 f18c433a 2022-05-31 stsp 		    delta_buf, delta_len);
1638 f18c433a 2022-05-31 stsp 		if (err)
1639 f18c433a 2022-05-31 stsp 			goto done;
1640 f18c433a 2022-05-31 stsp 		if (base_size > max_size)
1641 f18c433a 2022-05-31 stsp 			max_size = base_size;
1642 f18c433a 2022-05-31 stsp 		if (result_size > max_size)
1643 f18c433a 2022-05-31 stsp 			max_size = result_size;
1644 f18c433a 2022-05-31 stsp 
1645 f18c433a 2022-05-31 stsp 		if (max_size > base_bufsz) {
1646 f18c433a 2022-05-31 stsp 			uint8_t *p = realloc(base_buf, max_size);
1647 f18c433a 2022-05-31 stsp 			if (p == NULL) {
1648 f18c433a 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1649 f18c433a 2022-05-31 stsp 				goto done;
1650 f18c433a 2022-05-31 stsp 			}
1651 f18c433a 2022-05-31 stsp 			base_buf = p;
1652 f18c433a 2022-05-31 stsp 			base_bufsz = max_size;
1653 f18c433a 2022-05-31 stsp 		}
1654 f18c433a 2022-05-31 stsp 
1655 f18c433a 2022-05-31 stsp 		if (max_size > accum_bufsz) {
1656 f18c433a 2022-05-31 stsp 			uint8_t *p = realloc(accum_buf, max_size);
1657 f18c433a 2022-05-31 stsp 			if (p == NULL) {
1658 f18c433a 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1659 f18c433a 2022-05-31 stsp 				goto done;
1660 f18c433a 2022-05-31 stsp 			}
1661 f18c433a 2022-05-31 stsp 			accum_buf = p;
1662 f18c433a 2022-05-31 stsp 			accum_bufsz = max_size;
1663 f18c433a 2022-05-31 stsp 		}
1664 f18c433a 2022-05-31 stsp 
1665 34fca9c3 2018-11-11 stsp 		err = got_delta_apply_in_mem(base_buf, base_bufsz,
1666 42c69117 2019-11-10 stsp 		    delta_buf, delta_len, accum_buf,
1667 34fca9c3 2018-11-11 stsp 		    &accum_size, max_size);
1668 ab2f42e7 2019-11-10 stsp 		if (!cached)
1669 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1670 e0ab43e7 2018-03-16 stsp 		n++;
1671 e0ab43e7 2018-03-16 stsp 		if (err)
1672 e0ab43e7 2018-03-16 stsp 			goto done;
1673 e0ab43e7 2018-03-16 stsp 
1674 e0ab43e7 2018-03-16 stsp 		if (n < deltas->nentries) {
1675 e0ab43e7 2018-03-16 stsp 			/* Accumulated delta becomes the new base. */
1676 e0ab43e7 2018-03-16 stsp 			uint8_t *tmp = accum_buf;
1677 f18c433a 2022-05-31 stsp 			size_t tmp_size = accum_bufsz;
1678 e0ab43e7 2018-03-16 stsp 			accum_buf = base_buf;
1679 f18c433a 2022-05-31 stsp 			accum_bufsz = base_bufsz;
1680 e0ab43e7 2018-03-16 stsp 			base_buf = tmp;
1681 f18c433a 2022-05-31 stsp 			base_bufsz = tmp_size;
1682 e0ab43e7 2018-03-16 stsp 		}
1683 e0ab43e7 2018-03-16 stsp 	}
1684 e0ab43e7 2018-03-16 stsp 
1685 e0ab43e7 2018-03-16 stsp done:
1686 e0ab43e7 2018-03-16 stsp 	free(base_buf);
1687 e0ab43e7 2018-03-16 stsp 	if (err) {
1688 e0ab43e7 2018-03-16 stsp 		free(accum_buf);
1689 e0ab43e7 2018-03-16 stsp 		*outbuf = NULL;
1690 e0ab43e7 2018-03-16 stsp 		*outlen = 0;
1691 e0ab43e7 2018-03-16 stsp 	} else {
1692 e0ab43e7 2018-03-16 stsp 		*outbuf = accum_buf;
1693 e0ab43e7 2018-03-16 stsp 		*outlen = accum_size;
1694 e0ab43e7 2018-03-16 stsp 	}
1695 efd2a263 2018-01-19 stsp 	return err;
1696 efd2a263 2018-01-19 stsp }
1697 efd2a263 2018-01-19 stsp 
1698 3ee5fc21 2018-01-17 stsp const struct got_error *
1699 24140570 2018-09-09 stsp got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1700 3840f4c9 2018-09-12 stsp     FILE *outfile, FILE *base_file, FILE *accum_file)
1701 3ee5fc21 2018-01-17 stsp {
1702 3ee5fc21 2018-01-17 stsp 	const struct got_error *err = NULL;
1703 3ee5fc21 2018-01-17 stsp 
1704 3ee5fc21 2018-01-17 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1705 3ee5fc21 2018-01-17 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1706 2ce68b2f 2018-09-09 stsp 
1707 ef2bccd9 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1708 24140570 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1709 24140570 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1710 72eb3431 2018-04-01 stsp 
1711 d7464085 2018-07-09 stsp 		if (pack->map) {
1712 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1713 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1714 4788f1ce 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff,
1715 4788f1ce 2020-03-18 stsp 			    outfile);
1716 d7464085 2018-07-09 stsp 		} else {
1717 24140570 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1718 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1719 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1720 4788f1ce 2020-03-18 stsp 			    pack->fd, outfile);
1721 d7464085 2018-07-09 stsp 		}
1722 040bf4a1 2018-04-01 stsp 	} else
1723 4788f1ce 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_file(&obj->size,
1724 4788f1ce 2020-03-18 stsp 		    &obj->deltas, pack, outfile, base_file, accum_file);
1725 24140570 2018-09-09 stsp 
1726 a1fd68d8 2018-01-12 stsp 	return err;
1727 a1fd68d8 2018-01-12 stsp }
1728 e0ab43e7 2018-03-16 stsp 
1729 e0ab43e7 2018-03-16 stsp const struct got_error *
1730 e0ab43e7 2018-03-16 stsp got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1731 7e212e3d 2018-09-09 stsp     struct got_object *obj, struct got_pack *pack)
1732 e0ab43e7 2018-03-16 stsp {
1733 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1734 e0ab43e7 2018-03-16 stsp 
1735 e0ab43e7 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1736 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1737 72eb3431 2018-04-01 stsp 
1738 48095039 2018-09-09 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1739 7e212e3d 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1740 7e212e3d 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1741 d7464085 2018-07-09 stsp 		if (pack->map) {
1742 d7464085 2018-07-09 stsp 			size_t mapoff = (size_t)obj->pack_offset;
1743 2e5a6fad 2020-03-18 stsp 			err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1744 2e5a6fad 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff);
1745 d7464085 2018-07-09 stsp 		} else {
1746 7e212e3d 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1747 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1748 1e87a3c3 2020-03-18 stsp 			err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1749 55fdd257 2020-03-18 stsp 			    obj->size, pack->fd);
1750 e0ab43e7 2018-03-16 stsp 		}
1751 e0ab43e7 2018-03-16 stsp 	} else
1752 668a20f6 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1753 668a20f6 2020-03-18 stsp 		    pack);
1754 7e212e3d 2018-09-09 stsp 
1755 e0ab43e7 2018-03-16 stsp 	return err;
1756 e0ab43e7 2018-03-16 stsp }
1757 67fd6849 2022-02-13 stsp 
1758 2d9e6abf 2022-05-04 stsp static const struct got_error *
1759 2d9e6abf 2022-05-04 stsp read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1760 2d9e6abf 2022-05-04 stsp     size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1761 2d9e6abf 2022-05-04 stsp     off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1762 2d9e6abf 2022-05-04 stsp {
1763 2d9e6abf 2022-05-04 stsp 	const struct got_error *err = NULL;
1764 2d9e6abf 2022-05-04 stsp 
1765 2d9e6abf 2022-05-04 stsp 	/* Validate decompression and obtain the decompressed size. */
1766 2d9e6abf 2022-05-04 stsp 	err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1767 2d9e6abf 2022-05-04 stsp 	    delta_data_offset, pack);
1768 2d9e6abf 2022-05-04 stsp 	if (err)
1769 2d9e6abf 2022-05-04 stsp 		return err;
1770 2d9e6abf 2022-05-04 stsp 
1771 2d9e6abf 2022-05-04 stsp 	/* Read delta base/result sizes from head of delta stream. */
1772 2d9e6abf 2022-05-04 stsp 	err = got_delta_get_sizes(base_size, result_size,
1773 2d9e6abf 2022-05-04 stsp 	    *delta_buf, *delta_len);
1774 2d9e6abf 2022-05-04 stsp 	if (err)
1775 2d9e6abf 2022-05-04 stsp 		goto done;
1776 2d9e6abf 2022-05-04 stsp 
1777 2d9e6abf 2022-05-04 stsp 	/* Discard decompressed delta and read it again in compressed form. */
1778 2d9e6abf 2022-05-04 stsp 	free(*delta_buf);
1779 2d9e6abf 2022-05-04 stsp 	*delta_buf = malloc(*delta_len_compressed);
1780 2d9e6abf 2022-05-04 stsp 	if (*delta_buf == NULL) {
1781 2d9e6abf 2022-05-04 stsp 		err = got_error_from_errno("malloc");
1782 2d9e6abf 2022-05-04 stsp 		goto done;
1783 2d9e6abf 2022-05-04 stsp 	}
1784 2d9e6abf 2022-05-04 stsp 	if (pack->map) {
1785 82031ac8 2022-10-24 op 		if (delta_data_offset >= pack->filesize) {
1786 2d9e6abf 2022-05-04 stsp 			err = got_error(GOT_ERR_PACK_OFFSET);
1787 82031ac8 2022-10-24 op 			goto done;
1788 82031ac8 2022-10-24 op 		}
1789 2d9e6abf 2022-05-04 stsp 		memcpy(*delta_buf, pack->map + delta_data_offset,
1790 2d9e6abf 2022-05-04 stsp 		    *delta_len_compressed);
1791 2d9e6abf 2022-05-04 stsp 	} else {
1792 2d9e6abf 2022-05-04 stsp 		ssize_t n;
1793 2d9e6abf 2022-05-04 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1794 2d9e6abf 2022-05-04 stsp 			err = got_error_from_errno("lseek");
1795 2d9e6abf 2022-05-04 stsp 			goto done;
1796 2d9e6abf 2022-05-04 stsp 		}
1797 2d9e6abf 2022-05-04 stsp 		n = read(pack->fd, *delta_buf, *delta_len_compressed);
1798 2d9e6abf 2022-05-04 stsp 		if (n < 0) {
1799 2d9e6abf 2022-05-04 stsp 			err = got_error_from_errno("read");
1800 2d9e6abf 2022-05-04 stsp 			goto done;
1801 2d9e6abf 2022-05-04 stsp 		} else if (n != *delta_len_compressed) {
1802 2d9e6abf 2022-05-04 stsp 			err = got_error(GOT_ERR_IO);
1803 2d9e6abf 2022-05-04 stsp 			goto done;
1804 2d9e6abf 2022-05-04 stsp 		}
1805 2d9e6abf 2022-05-04 stsp 	}
1806 2d9e6abf 2022-05-04 stsp done:
1807 2d9e6abf 2022-05-04 stsp 	if (err) {
1808 2d9e6abf 2022-05-04 stsp 		free(*delta_buf);
1809 2d9e6abf 2022-05-04 stsp 		*delta_buf = NULL;
1810 2d9e6abf 2022-05-04 stsp 		*delta_len = 0;
1811 2d9e6abf 2022-05-04 stsp 		*delta_len_compressed = 0;
1812 2d9e6abf 2022-05-04 stsp 		*base_size = 0;
1813 2d9e6abf 2022-05-04 stsp 		*result_size = 0;
1814 2d9e6abf 2022-05-04 stsp 	}
1815 2d9e6abf 2022-05-04 stsp 	return err;
1816 2d9e6abf 2022-05-04 stsp }
1817 2d9e6abf 2022-05-04 stsp 
1818 67fd6849 2022-02-13 stsp const struct got_error *
1819 67fd6849 2022-02-13 stsp got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1820 2d9e6abf 2022-05-04 stsp     size_t *delta_compressed_size, off_t *delta_offset, off_t *base_offset,
1821 2d9e6abf 2022-05-04 stsp     struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1822 2d9e6abf 2022-05-04 stsp     struct got_pack *pack, struct got_packidx *packidx, int idx)
1823 67fd6849 2022-02-13 stsp {
1824 67fd6849 2022-02-13 stsp 	const struct got_error *err = NULL;
1825 67fd6849 2022-02-13 stsp 	off_t offset;
1826 67fd6849 2022-02-13 stsp 	uint8_t type;
1827 67fd6849 2022-02-13 stsp 	uint64_t size;
1828 67fd6849 2022-02-13 stsp 	size_t tslen, delta_hdrlen;
1829 2d9e6abf 2022-05-04 stsp 	off_t delta_data_offset;
1830 67fd6849 2022-02-13 stsp 
1831 67fd6849 2022-02-13 stsp 	*delta_buf = NULL;
1832 67fd6849 2022-02-13 stsp 	*delta_size = 0;
1833 2d9e6abf 2022-05-04 stsp 	*delta_compressed_size = 0;
1834 67fd6849 2022-02-13 stsp 	*delta_offset = 0;
1835 67fd6849 2022-02-13 stsp 	*base_offset = 0;
1836 67fd6849 2022-02-13 stsp 	*base_size = 0;
1837 67fd6849 2022-02-13 stsp 	*result_size = 0;
1838 67fd6849 2022-02-13 stsp 
1839 67fd6849 2022-02-13 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1840 04aed155 2022-07-24 naddy 	if (offset == -1)
1841 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1842 67fd6849 2022-02-13 stsp 
1843 67fd6849 2022-02-13 stsp 	if (offset >= pack->filesize)
1844 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1845 67fd6849 2022-02-13 stsp 
1846 67fd6849 2022-02-13 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1847 67fd6849 2022-02-13 stsp 	    pack, offset);
1848 67fd6849 2022-02-13 stsp 	if (err)
1849 67fd6849 2022-02-13 stsp 		return err;
1850 67fd6849 2022-02-13 stsp 
1851 67fd6849 2022-02-13 stsp 	if (tslen + size < tslen || offset + size < size ||
1852 67fd6849 2022-02-13 stsp 	    tslen + offset < tslen)
1853 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1854 67fd6849 2022-02-13 stsp 
1855 67fd6849 2022-02-13 stsp 	switch (type) {
1856 67fd6849 2022-02-13 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1857 67fd6849 2022-02-13 stsp 		err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1858 67fd6849 2022-02-13 stsp 		    pack, offset, tslen);
1859 67fd6849 2022-02-13 stsp 		if (err)
1860 67fd6849 2022-02-13 stsp 			return err;
1861 67fd6849 2022-02-13 stsp 		break;
1862 67fd6849 2022-02-13 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1863 67fd6849 2022-02-13 stsp 		err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1864 67fd6849 2022-02-13 stsp 		if (err)
1865 67fd6849 2022-02-13 stsp 			return err;
1866 67fd6849 2022-02-13 stsp 		delta_hdrlen = SHA1_DIGEST_LENGTH;
1867 67fd6849 2022-02-13 stsp 		break;
1868 67fd6849 2022-02-13 stsp 	default:
1869 67fd6849 2022-02-13 stsp 		return got_error_fmt(GOT_ERR_OBJ_TYPE,
1870 04aed155 2022-07-24 naddy 		    "non-delta object type %d found at offset %lld",
1871 04aed155 2022-07-24 naddy 		    type, (long long)offset);
1872 67fd6849 2022-02-13 stsp 	}
1873 67fd6849 2022-02-13 stsp 
1874 67fd6849 2022-02-13 stsp 	if (tslen + delta_hdrlen < delta_hdrlen ||
1875 67fd6849 2022-02-13 stsp 	    offset + delta_hdrlen < delta_hdrlen)
1876 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_DELTA);
1877 67fd6849 2022-02-13 stsp 
1878 2d9e6abf 2022-05-04 stsp 	delta_data_offset = offset + tslen + delta_hdrlen;
1879 2d9e6abf 2022-05-04 stsp 	err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
1880 2d9e6abf 2022-05-04 stsp 	    base_size, result_size, delta_data_offset, pack, packidx);
1881 67fd6849 2022-02-13 stsp 	if (err)
1882 67fd6849 2022-02-13 stsp 		return err;
1883 67fd6849 2022-02-13 stsp 
1884 67fd6849 2022-02-13 stsp 	if (*delta_size != size) {
1885 67fd6849 2022-02-13 stsp 		err = got_error(GOT_ERR_BAD_DELTA);
1886 67fd6849 2022-02-13 stsp 		goto done;
1887 67fd6849 2022-02-13 stsp 	}
1888 67fd6849 2022-02-13 stsp 
1889 67fd6849 2022-02-13 stsp 	*delta_offset = offset;
1890 67fd6849 2022-02-13 stsp done:
1891 67fd6849 2022-02-13 stsp 	if (err) {
1892 67fd6849 2022-02-13 stsp 		free(*delta_buf);
1893 67fd6849 2022-02-13 stsp 		*delta_buf = NULL;
1894 2d9e6abf 2022-05-04 stsp 		*delta_size = 0;
1895 2d9e6abf 2022-05-04 stsp 		*delta_compressed_size = 0;
1896 2d9e6abf 2022-05-04 stsp 		*delta_offset = 0;
1897 2d9e6abf 2022-05-04 stsp 		*base_offset = 0;
1898 2d9e6abf 2022-05-04 stsp 		*base_size = 0;
1899 2d9e6abf 2022-05-04 stsp 		*result_size = 0;
1900 67fd6849 2022-02-13 stsp 	}
1901 67fd6849 2022-02-13 stsp 	return err;
1902 67fd6849 2022-02-13 stsp }