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 e83f12a6 2023-02-12 op #include <sha2.h>
  34 0a0a3048 2018-01-10 stsp #include <endian.h>
  35 81a12da5 2020-09-09 naddy #include <unistd.h>
  36 a1fd68d8 2018-01-12 stsp #include <zlib.h>
  37 876c234b 2018-09-10 stsp #include <imsg.h>
  38 0a0a3048 2018-01-10 stsp 
  39 0a0a3048 2018-01-10 stsp #include "got_error.h"
  40 a1fd68d8 2018-01-12 stsp #include "got_object.h"
  41 324d37e7 2019-05-11 stsp #include "got_path.h"
  42 0a0a3048 2018-01-10 stsp 
  43 4123af3c 2023-02-12 op #include "got_lib_hash.h"
  44 718b3ab0 2018-03-17 stsp #include "got_lib_delta.h"
  45 ab2f42e7 2019-11-10 stsp #include "got_lib_delta_cache.h"
  46 63581804 2018-07-09 stsp #include "got_lib_inflate.h"
  47 718b3ab0 2018-03-17 stsp #include "got_lib_object.h"
  48 dd88155e 2019-06-29 stsp #include "got_lib_object_parse.h"
  49 876c234b 2018-09-10 stsp #include "got_lib_privsep.h"
  50 15a94983 2018-12-23 stsp #include "got_lib_pack.h"
  51 79b11c62 2018-03-09 stsp 
  52 79b11c62 2018-03-09 stsp #ifndef nitems
  53 79b11c62 2018-03-09 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  54 79b11c62 2018-03-09 stsp #endif
  55 1411938b 2018-02-12 stsp 
  56 a1fd68d8 2018-01-12 stsp #ifndef MIN
  57 a1fd68d8 2018-01-12 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  58 a1fd68d8 2018-01-12 stsp #endif
  59 a1fd68d8 2018-01-12 stsp 
  60 0a0a3048 2018-01-10 stsp static const struct got_error *
  61 0a0a3048 2018-01-10 stsp verify_fanout_table(uint32_t *fanout_table)
  62 0a0a3048 2018-01-10 stsp {
  63 0a0a3048 2018-01-10 stsp 	int i;
  64 0a0a3048 2018-01-10 stsp 
  65 0a0a3048 2018-01-10 stsp 	for (i = 0; i < 0xff - 1; i++) {
  66 a1fd68d8 2018-01-12 stsp 		if (be32toh(fanout_table[i]) > be32toh(fanout_table[i + 1]))
  67 0a0a3048 2018-01-10 stsp 			return got_error(GOT_ERR_BAD_PACKIDX);
  68 0a0a3048 2018-01-10 stsp 	}
  69 0a0a3048 2018-01-10 stsp 
  70 0a0a3048 2018-01-10 stsp 	return NULL;
  71 0a0a3048 2018-01-10 stsp }
  72 0a0a3048 2018-01-10 stsp 
  73 1510f469 2018-09-09 stsp const struct got_error *
  74 c3564dfa 2021-07-15 stsp got_packidx_init_hdr(struct got_packidx *p, int verify, off_t packfile_size)
  75 0a0a3048 2018-01-10 stsp {
  76 0a0a3048 2018-01-10 stsp 	const struct got_error *err = NULL;
  77 817c5a18 2018-09-09 stsp 	struct got_packidx_v2_hdr *h;
  78 3f81ccbd 2023-02-12 op 	struct got_hash ctx;
  79 3f81ccbd 2023-02-12 op 	uint8_t hash[GOT_OBJECT_ID_MAXLEN];
  80 817c5a18 2018-09-09 stsp 	size_t nobj, len_fanout, len_ids, offset, remain;
  81 817c5a18 2018-09-09 stsp 	ssize_t n;
  82 5e6be232 2019-11-08 stsp 	int i;
  83 0a0a3048 2018-01-10 stsp 
  84 42b6bfc8 2023-02-12 op 	got_hash_init(&ctx, p->algo);
  85 0ebaf008 2018-01-10 stsp 
  86 57b35b75 2018-06-22 stsp 	h = &p->hdr;
  87 57b35b75 2018-06-22 stsp 	offset = 0;
  88 57b35b75 2018-06-22 stsp 	remain = p->len;
  89 0a0a3048 2018-01-10 stsp 
  90 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->magic)) {
  91 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
  92 0a0a3048 2018-01-10 stsp 		goto done;
  93 0a0a3048 2018-01-10 stsp 	}
  94 fc79a48d 2018-07-09 stsp 	if (p->map)
  95 fc79a48d 2018-07-09 stsp 		h->magic = (uint32_t *)(p->map + offset);
  96 fc79a48d 2018-07-09 stsp 	else {
  97 fc79a48d 2018-07-09 stsp 		h->magic = malloc(sizeof(*h->magic));
  98 fc79a48d 2018-07-09 stsp 		if (h->magic == NULL) {
  99 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 100 fc79a48d 2018-07-09 stsp 			goto done;
 101 fc79a48d 2018-07-09 stsp 		}
 102 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->magic, sizeof(*h->magic));
 103 b1317e77 2019-09-22 stsp 		if (n < 0) {
 104 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 105 b1317e77 2019-09-22 stsp 			goto done;
 106 b1317e77 2019-09-22 stsp 		} else if (n != sizeof(*h->magic)) {
 107 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 108 fc79a48d 2018-07-09 stsp 			goto done;
 109 fc79a48d 2018-07-09 stsp 		}
 110 fc79a48d 2018-07-09 stsp 	}
 111 ac62b712 2021-03-30 stsp 	if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)) {
 112 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 113 57b35b75 2018-06-22 stsp 		goto done;
 114 57b35b75 2018-06-22 stsp 	}
 115 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->magic);
 116 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->magic);
 117 0a0a3048 2018-01-10 stsp 
 118 0cb74cf4 2018-07-08 stsp 	if (verify)
 119 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, h->magic, sizeof(*h->magic));
 120 0ebaf008 2018-01-10 stsp 
 121 57b35b75 2018-06-22 stsp 	if (remain < sizeof(*h->version)) {
 122 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 123 0a0a3048 2018-01-10 stsp 		goto done;
 124 0a0a3048 2018-01-10 stsp 	}
 125 fc79a48d 2018-07-09 stsp 	if (p->map)
 126 fc79a48d 2018-07-09 stsp 		h->version = (uint32_t *)(p->map + offset);
 127 fc79a48d 2018-07-09 stsp 	else {
 128 fc79a48d 2018-07-09 stsp 		h->version = malloc(sizeof(*h->version));
 129 fc79a48d 2018-07-09 stsp 		if (h->version == NULL) {
 130 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 131 fc79a48d 2018-07-09 stsp 			goto done;
 132 fc79a48d 2018-07-09 stsp 		}
 133 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->version, sizeof(*h->version));
 134 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 135 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 136 c6368c2e 2019-10-11 stsp 			goto done;
 137 c6368c2e 2019-10-11 stsp 		} else if (n != sizeof(*h->version)) {
 138 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 139 fc79a48d 2018-07-09 stsp 			goto done;
 140 fc79a48d 2018-07-09 stsp 		}
 141 fc79a48d 2018-07-09 stsp 	}
 142 ac62b712 2021-03-30 stsp 	if (*h->version != htobe32(GOT_PACKIDX_VERSION)) {
 143 0a0a3048 2018-01-10 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 144 0a0a3048 2018-01-10 stsp 		goto done;
 145 0a0a3048 2018-01-10 stsp 	}
 146 57b35b75 2018-06-22 stsp 	offset += sizeof(*h->version);
 147 57b35b75 2018-06-22 stsp 	remain -= sizeof(*h->version);
 148 0a0a3048 2018-01-10 stsp 
 149 0cb74cf4 2018-07-08 stsp 	if (verify)
 150 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, h->version, sizeof(*h->version));
 151 0ebaf008 2018-01-10 stsp 
 152 57b35b75 2018-06-22 stsp 	len_fanout =
 153 57b35b75 2018-06-22 stsp 	    sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS;
 154 57b35b75 2018-06-22 stsp 	if (remain < len_fanout) {
 155 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 156 0a0a3048 2018-01-10 stsp 		goto done;
 157 0a0a3048 2018-01-10 stsp 	}
 158 fc79a48d 2018-07-09 stsp 	if (p->map)
 159 fc79a48d 2018-07-09 stsp 		h->fanout_table = (uint32_t *)(p->map + offset);
 160 fc79a48d 2018-07-09 stsp 	else {
 161 fc79a48d 2018-07-09 stsp 		h->fanout_table = malloc(len_fanout);
 162 fc79a48d 2018-07-09 stsp 		if (h->fanout_table == NULL) {
 163 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 164 fc79a48d 2018-07-09 stsp 			goto done;
 165 fc79a48d 2018-07-09 stsp 		}
 166 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->fanout_table, len_fanout);
 167 c6368c2e 2019-10-11 stsp 		if (n < 0) {
 168 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 169 c6368c2e 2019-10-11 stsp 			goto done;
 170 c6368c2e 2019-10-11 stsp 		} else if (n != len_fanout) {
 171 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 172 fc79a48d 2018-07-09 stsp 			goto done;
 173 fc79a48d 2018-07-09 stsp 		}
 174 fc79a48d 2018-07-09 stsp 	}
 175 c8262310 2018-06-04 stsp 	err = verify_fanout_table(h->fanout_table);
 176 0a0a3048 2018-01-10 stsp 	if (err)
 177 0a0a3048 2018-01-10 stsp 		goto done;
 178 0cb74cf4 2018-07-08 stsp 	if (verify)
 179 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, h->fanout_table, len_fanout);
 180 57b35b75 2018-06-22 stsp 	offset += len_fanout;
 181 57b35b75 2018-06-22 stsp 	remain -= len_fanout;
 182 0a0a3048 2018-01-10 stsp 
 183 78fb0967 2020-09-09 naddy 	nobj = be32toh(h->fanout_table[0xff]);
 184 42b6bfc8 2023-02-12 op 	len_ids = nobj * got_hash_digest_length(p->algo);
 185 57b35b75 2018-06-22 stsp 	if (len_ids <= nobj || len_ids > remain) {
 186 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 187 0a0a3048 2018-01-10 stsp 		goto done;
 188 0a0a3048 2018-01-10 stsp 	}
 189 fc79a48d 2018-07-09 stsp 	if (p->map)
 190 f57598a2 2023-02-12 op 		h->sorted_ids = 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 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, 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 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, 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 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, h->offsets, nobj * sizeof(*h->offsets));
 257 57b35b75 2018-06-22 stsp 	remain -= nobj * sizeof(*h->offsets);
 258 57b35b75 2018-06-22 stsp 	offset += nobj * sizeof(*h->offsets);
 259 0ebaf008 2018-01-10 stsp 
 260 0a0a3048 2018-01-10 stsp 	/* Large file offsets are contained only in files > 2GB. */
 261 c3564dfa 2021-07-15 stsp 	if (verify || packfile_size > 0x7fffffff) {
 262 c3564dfa 2021-07-15 stsp 		for (i = 0; i < nobj; i++) {
 263 c3564dfa 2021-07-15 stsp 			uint32_t o = h->offsets[i];
 264 c3564dfa 2021-07-15 stsp 			if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX))
 265 c3564dfa 2021-07-15 stsp 				p->nlargeobj++;
 266 c3564dfa 2021-07-15 stsp 		}
 267 5e6be232 2019-11-08 stsp 	}
 268 5e6be232 2019-11-08 stsp 	if (p->nlargeobj == 0)
 269 0a0a3048 2018-01-10 stsp 		goto checksum;
 270 c3564dfa 2021-07-15 stsp 	else if (packfile_size <= 0x7fffffff) {
 271 c3564dfa 2021-07-15 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 272 c3564dfa 2021-07-15 stsp 		goto done;
 273 c3564dfa 2021-07-15 stsp 	}
 274 0a0a3048 2018-01-10 stsp 
 275 5e6be232 2019-11-08 stsp 	if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
 276 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 277 0a0a3048 2018-01-10 stsp 		goto done;
 278 0a0a3048 2018-01-10 stsp 	}
 279 fc79a48d 2018-07-09 stsp 	if (p->map)
 280 fc79a48d 2018-07-09 stsp 		h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
 281 fc79a48d 2018-07-09 stsp 	else {
 282 5e6be232 2019-11-08 stsp 		h->large_offsets = malloc(p->nlargeobj *
 283 5e6be232 2019-11-08 stsp 		    sizeof(*h->large_offsets));
 284 de30857e 2019-08-23 stsp 		if (h->large_offsets == NULL) {
 285 638f9024 2019-05-13 stsp 			err = got_error_from_errno("malloc");
 286 fc79a48d 2018-07-09 stsp 			goto done;
 287 fc79a48d 2018-07-09 stsp 		}
 288 fc79a48d 2018-07-09 stsp 		n = read(p->fd, h->large_offsets,
 289 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 290 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 291 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 292 5e6be232 2019-11-08 stsp 		else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
 293 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 294 fc79a48d 2018-07-09 stsp 			goto done;
 295 fc79a48d 2018-07-09 stsp 		}
 296 fc79a48d 2018-07-09 stsp 	}
 297 0cb74cf4 2018-07-08 stsp 	if (verify)
 298 3f81ccbd 2023-02-12 op 		got_hash_update(&ctx, h->large_offsets,
 299 5e6be232 2019-11-08 stsp 		    p->nlargeobj * sizeof(*h->large_offsets));
 300 5e6be232 2019-11-08 stsp 	remain -= p->nlargeobj * sizeof(*h->large_offsets);
 301 5e6be232 2019-11-08 stsp 	offset += p->nlargeobj * sizeof(*h->large_offsets);
 302 0ebaf008 2018-01-10 stsp 
 303 0a0a3048 2018-01-10 stsp checksum:
 304 fb2a9ab8 2023-02-12 op 	if (remain < 2 * got_hash_digest_length(p->algo)) {
 305 57b35b75 2018-06-22 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 306 0a0a3048 2018-01-10 stsp 		goto done;
 307 0a0a3048 2018-01-10 stsp 	}
 308 fb2a9ab8 2023-02-12 op 	if (p->map) {
 309 fb2a9ab8 2023-02-12 op 		const uint8_t *base = p->map + offset;
 310 fb2a9ab8 2023-02-12 op 
 311 fb2a9ab8 2023-02-12 op 		memcpy(&h->trailer.packfile_hash, base,
 312 fb2a9ab8 2023-02-12 op 		    got_hash_digest_length(p->algo));
 313 fb2a9ab8 2023-02-12 op 		base += got_hash_digest_length(p->algo);
 314 fb2a9ab8 2023-02-12 op 		memcpy(&h->trailer.packidx_hash, base,
 315 fb2a9ab8 2023-02-12 op 		    got_hash_digest_length(p->algo));
 316 fb2a9ab8 2023-02-12 op 	} else {
 317 fb2a9ab8 2023-02-12 op 		err = NULL;
 318 fb2a9ab8 2023-02-12 op 		n = read(p->fd, &h->trailer.packfile_hash,
 319 fb2a9ab8 2023-02-12 op 		    got_hash_digest_length(p->algo));
 320 fb2a9ab8 2023-02-12 op 		if (n < 0)
 321 fb2a9ab8 2023-02-12 op 			err = got_error_from_errno("read");
 322 fb2a9ab8 2023-02-12 op 		else if (n != got_hash_digest_length(p->algo))
 323 fb2a9ab8 2023-02-12 op 			err = got_error(GOT_ERR_BAD_PACKIDX);
 324 fb2a9ab8 2023-02-12 op 		if (err)
 325 fc79a48d 2018-07-09 stsp 			goto done;
 326 fb2a9ab8 2023-02-12 op 
 327 fb2a9ab8 2023-02-12 op 		n = read(p->fd, &h->trailer.packidx_hash,
 328 fb2a9ab8 2023-02-12 op 		    got_hash_digest_length(p->algo));
 329 faaa1c0f 2018-09-15 stsp 		if (n < 0)
 330 638f9024 2019-05-13 stsp 			err = got_error_from_errno("read");
 331 fb2a9ab8 2023-02-12 op 		else if (n != got_hash_digest_length(p->algo))
 332 fc79a48d 2018-07-09 stsp 			err = got_error(GOT_ERR_BAD_PACKIDX);
 333 fb2a9ab8 2023-02-12 op 		if (err)
 334 fc79a48d 2018-07-09 stsp 			goto done;
 335 fc79a48d 2018-07-09 stsp 	}
 336 0cb74cf4 2018-07-08 stsp 	if (verify) {
 337 fb2a9ab8 2023-02-12 op 		got_hash_update(&ctx, h->trailer.packfile_hash,
 338 42b6bfc8 2023-02-12 op 		    got_hash_digest_length(p->algo));
 339 3f81ccbd 2023-02-12 op 		got_hash_final(&ctx, hash);
 340 fb2a9ab8 2023-02-12 op 		if (got_hash_cmp(&ctx, hash, h->trailer.packidx_hash) != 0)
 341 0cb74cf4 2018-07-08 stsp 			err = got_error(GOT_ERR_PACKIDX_CSUM);
 342 0cb74cf4 2018-07-08 stsp 	}
 343 0a0a3048 2018-01-10 stsp done:
 344 817c5a18 2018-09-09 stsp 	return err;
 345 817c5a18 2018-09-09 stsp }
 346 817c5a18 2018-09-09 stsp 
 347 817c5a18 2018-09-09 stsp const struct got_error *
 348 6d5a9006 2020-12-16 yzhong got_packidx_open(struct got_packidx **packidx,
 349 42b6bfc8 2023-02-12 op     int dir_fd, const char *relpath, int verify,
 350 42b6bfc8 2023-02-12 op     enum got_hash_algorithm algo)
 351 817c5a18 2018-09-09 stsp {
 352 817c5a18 2018-09-09 stsp 	const struct got_error *err = NULL;
 353 1124fe40 2021-07-07 stsp 	struct got_packidx *p = NULL;
 354 1124fe40 2021-07-07 stsp 	char *pack_relpath;
 355 c3564dfa 2021-07-15 stsp 	struct stat idx_sb, pack_sb;
 356 817c5a18 2018-09-09 stsp 
 357 817c5a18 2018-09-09 stsp 	*packidx = NULL;
 358 1124fe40 2021-07-07 stsp 
 359 1124fe40 2021-07-07 stsp 	err = got_packidx_get_packfile_path(&pack_relpath, relpath);
 360 1124fe40 2021-07-07 stsp 	if (err)
 361 1124fe40 2021-07-07 stsp 		return err;
 362 1124fe40 2021-07-07 stsp 
 363 1124fe40 2021-07-07 stsp 	/*
 364 1124fe40 2021-07-07 stsp 	 * Ensure that a corresponding pack file exists.
 365 1124fe40 2021-07-07 stsp 	 * Some Git repositories have this problem. Git seems to ignore
 366 1124fe40 2021-07-07 stsp 	 * the existence of lonely pack index files but we do not.
 367 1124fe40 2021-07-07 stsp 	 */
 368 c3564dfa 2021-07-15 stsp 	if (fstatat(dir_fd, pack_relpath, &pack_sb, 0) == -1) {
 369 1124fe40 2021-07-07 stsp 		if (errno == ENOENT) {
 370 1124fe40 2021-07-07 stsp 			err = got_error_fmt(GOT_ERR_LONELY_PACKIDX,
 371 1124fe40 2021-07-07 stsp 			    "%s", relpath);
 372 1124fe40 2021-07-07 stsp 		} else
 373 1124fe40 2021-07-07 stsp 			err = got_error_from_errno2("fstatat", pack_relpath);
 374 1124fe40 2021-07-07 stsp 		goto done;
 375 1124fe40 2021-07-07 stsp 	}
 376 817c5a18 2018-09-09 stsp 
 377 817c5a18 2018-09-09 stsp 	p = calloc(1, sizeof(*p));
 378 1124fe40 2021-07-07 stsp 	if (p == NULL) {
 379 1124fe40 2021-07-07 stsp 		err = got_error_from_errno("calloc");
 380 1124fe40 2021-07-07 stsp 		goto done;
 381 1124fe40 2021-07-07 stsp 	}
 382 42b6bfc8 2023-02-12 op 
 383 42b6bfc8 2023-02-12 op 	p->algo = algo;
 384 817c5a18 2018-09-09 stsp 
 385 e7ae0baf 2021-12-31 stsp 	p->fd = openat(dir_fd, relpath, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
 386 6772cf22 2019-08-28 hiltjo 	if (p->fd == -1) {
 387 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("openat", relpath);
 388 1124fe40 2021-07-07 stsp 		goto done;
 389 6772cf22 2019-08-28 hiltjo 	}
 390 817c5a18 2018-09-09 stsp 
 391 c3564dfa 2021-07-15 stsp 	if (fstat(p->fd, &idx_sb) != 0) {
 392 6d5a9006 2020-12-16 yzhong 		err = got_error_from_errno2("fstat", relpath);
 393 1124fe40 2021-07-07 stsp 		goto done;
 394 817c5a18 2018-09-09 stsp 	}
 395 c3564dfa 2021-07-15 stsp 	p->len = idx_sb.st_size;
 396 817c5a18 2018-09-09 stsp 	if (p->len < sizeof(p->hdr)) {
 397 817c5a18 2018-09-09 stsp 		err = got_error(GOT_ERR_BAD_PACKIDX);
 398 1124fe40 2021-07-07 stsp 		goto done;
 399 817c5a18 2018-09-09 stsp 	}
 400 817c5a18 2018-09-09 stsp 
 401 6d5a9006 2020-12-16 yzhong 	p->path_packidx = strdup(relpath);
 402 817c5a18 2018-09-09 stsp 	if (p->path_packidx == NULL) {
 403 638f9024 2019-05-13 stsp 		err = got_error_from_errno("strdup");
 404 817c5a18 2018-09-09 stsp 		goto done;
 405 817c5a18 2018-09-09 stsp 	}
 406 817c5a18 2018-09-09 stsp 
 407 817c5a18 2018-09-09 stsp #ifndef GOT_PACK_NO_MMAP
 408 1c28a361 2022-10-25 op 	if (p->len > 0 && p->len <= SIZE_MAX) {
 409 1c28a361 2022-10-25 op 		p->map = mmap(NULL, p->len, PROT_READ, MAP_PRIVATE, p->fd, 0);
 410 1c28a361 2022-10-25 op 		if (p->map == MAP_FAILED) {
 411 1c28a361 2022-10-25 op 			if (errno != ENOMEM) {
 412 1c28a361 2022-10-25 op 				err = got_error_from_errno("mmap");
 413 1c28a361 2022-10-25 op 				goto done;
 414 1c28a361 2022-10-25 op 			}
 415 1c28a361 2022-10-25 op 			p->map = NULL; /* fall back to read(2) */
 416 3a11398b 2019-02-21 stsp 		}
 417 3a11398b 2019-02-21 stsp 	}
 418 817c5a18 2018-09-09 stsp #endif
 419 817c5a18 2018-09-09 stsp 
 420 c3564dfa 2021-07-15 stsp 	err = got_packidx_init_hdr(p, verify, pack_sb.st_size);
 421 817c5a18 2018-09-09 stsp done:
 422 1124fe40 2021-07-07 stsp 	if (err) {
 423 1124fe40 2021-07-07 stsp 		if (p)
 424 1124fe40 2021-07-07 stsp 			got_packidx_close(p);
 425 1124fe40 2021-07-07 stsp 	} else
 426 0a0a3048 2018-01-10 stsp 		*packidx = p;
 427 1124fe40 2021-07-07 stsp 	free(pack_relpath);
 428 0a0a3048 2018-01-10 stsp 	return err;
 429 0a0a3048 2018-01-10 stsp }
 430 0a0a3048 2018-01-10 stsp 
 431 57b35b75 2018-06-22 stsp const struct got_error *
 432 6fd11751 2018-06-04 stsp got_packidx_close(struct got_packidx *packidx)
 433 0a0a3048 2018-01-10 stsp {
 434 57b35b75 2018-06-22 stsp 	const struct got_error *err = NULL;
 435 57b35b75 2018-06-22 stsp 
 436 6fd11751 2018-06-04 stsp 	free(packidx->path_packidx);
 437 fc79a48d 2018-07-09 stsp 	if (packidx->map) {
 438 57b35b75 2018-06-22 stsp 		if (munmap(packidx->map, packidx->len) == -1)
 439 638f9024 2019-05-13 stsp 			err = got_error_from_errno("munmap");
 440 fc79a48d 2018-07-09 stsp 	} else {
 441 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.magic);
 442 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.version);
 443 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.fanout_table);
 444 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.sorted_ids);
 445 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.crc32);
 446 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.offsets);
 447 fc79a48d 2018-07-09 stsp 		free(packidx->hdr.large_offsets);
 448 57b35b75 2018-06-22 stsp 	}
 449 08578a35 2021-01-22 stsp 	if (close(packidx->fd) == -1 && err == NULL)
 450 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 451 67fd6849 2022-02-13 stsp 	free(packidx->sorted_offsets);
 452 67fd6849 2022-02-13 stsp 	free(packidx->sorted_large_offsets);
 453 0a0a3048 2018-01-10 stsp 	free(packidx);
 454 57b35b75 2018-06-22 stsp 
 455 57b35b75 2018-06-22 stsp 	return err;
 456 a1fd68d8 2018-01-12 stsp }
 457 509c9973 2021-04-10 stsp 
 458 2d9874c2 2023-02-12 op static const struct got_error *
 459 2d9874c2 2023-02-12 op packfile_path(char **path_packfile, const char *path_packidx)
 460 509c9973 2021-04-10 stsp {
 461 509c9973 2021-04-10 stsp 	size_t size;
 462 509c9973 2021-04-10 stsp 
 463 509c9973 2021-04-10 stsp 	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
 464 aea75d87 2021-07-06 stsp 	size = strlen(path_packidx) + 2;
 465 509c9973 2021-04-10 stsp 	if (size < GOT_PACKFILE_NAMELEN + 1)
 466 aea75d87 2021-07-06 stsp 		return got_error_path(path_packidx, GOT_ERR_BAD_PATH);
 467 a1fd68d8 2018-01-12 stsp 
 468 509c9973 2021-04-10 stsp 	*path_packfile = malloc(size);
 469 509c9973 2021-04-10 stsp 	if (*path_packfile == NULL)
 470 509c9973 2021-04-10 stsp 		return got_error_from_errno("malloc");
 471 509c9973 2021-04-10 stsp 
 472 509c9973 2021-04-10 stsp 	/* Copy up to and excluding ".idx". */
 473 aea75d87 2021-07-06 stsp 	if (strlcpy(*path_packfile, path_packidx,
 474 509c9973 2021-04-10 stsp 	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
 475 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 476 509c9973 2021-04-10 stsp 
 477 509c9973 2021-04-10 stsp 	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
 478 509c9973 2021-04-10 stsp 		return got_error(GOT_ERR_NO_SPACE);
 479 509c9973 2021-04-10 stsp 
 480 509c9973 2021-04-10 stsp 	return NULL;
 481 509c9973 2021-04-10 stsp }
 482 509c9973 2021-04-10 stsp 
 483 2d9874c2 2023-02-12 op const struct got_error *
 484 2d9874c2 2023-02-12 op got_packidx_get_packfile_path(char **path_packfile, const char *path)
 485 2d9874c2 2023-02-12 op {
 486 2d9874c2 2023-02-12 op 	const struct got_error *err;
 487 2d9874c2 2023-02-12 op 
 488 2d9874c2 2023-02-12 op 	err = packfile_path(path_packfile, path);
 489 2d9874c2 2023-02-12 op 	if (err) {
 490 2d9874c2 2023-02-12 op 		fprintf(stderr, "%s: failed for path %s: %s\n",
 491 2d9874c2 2023-02-12 op 		    __func__, path, err->msg);
 492 2d9874c2 2023-02-12 op 	}
 493 2d9874c2 2023-02-12 op 	return err;
 494 2d9874c2 2023-02-12 op }
 495 2d9874c2 2023-02-12 op 
 496 02828bfd 2021-06-22 stsp off_t
 497 02828bfd 2021-06-22 stsp got_packidx_get_object_offset(struct got_packidx *packidx, int idx)
 498 a1fd68d8 2018-01-12 stsp {
 499 78fb0967 2020-09-09 naddy 	uint32_t offset = be32toh(packidx->hdr.offsets[idx]);
 500 a1fd68d8 2018-01-12 stsp 	if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 501 a1fd68d8 2018-01-12 stsp 		uint64_t loffset;
 502 a1fd68d8 2018-01-12 stsp 		idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 503 5e6be232 2019-11-08 stsp 		if (idx < 0 || idx >= packidx->nlargeobj ||
 504 6fd11751 2018-06-04 stsp 		    packidx->hdr.large_offsets == NULL)
 505 a1fd68d8 2018-01-12 stsp 			return -1;
 506 78fb0967 2020-09-09 naddy 		loffset = be64toh(packidx->hdr.large_offsets[idx]);
 507 a1fd68d8 2018-01-12 stsp 		return (loffset > INT64_MAX ? -1 : (off_t)loffset);
 508 a1fd68d8 2018-01-12 stsp 	}
 509 a1fd68d8 2018-01-12 stsp 	return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK);
 510 a1fd68d8 2018-01-12 stsp }
 511 a1fd68d8 2018-01-12 stsp 
 512 1510f469 2018-09-09 stsp int
 513 c0df5966 2021-12-31 stsp got_packidx_get_object_idx(struct got_packidx *packidx,
 514 c0df5966 2021-12-31 stsp     struct got_object_id *id)
 515 a1fd68d8 2018-01-12 stsp {
 516 a41a7d4a 2023-02-12 op 	u_int8_t id0 = id->hash[0];
 517 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 518 40aeb19c 2018-06-22 stsp 	int left = 0, right = totobj - 1;
 519 f57598a2 2023-02-12 op 	size_t idlen;
 520 f57598a2 2023-02-12 op 
 521 42b6bfc8 2023-02-12 op 	idlen = got_hash_digest_length(packidx->algo);
 522 a1fd68d8 2018-01-12 stsp 
 523 a1fd68d8 2018-01-12 stsp 	if (id0 > 0)
 524 78fb0967 2020-09-09 naddy 		left = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 525 a1fd68d8 2018-01-12 stsp 
 526 40aeb19c 2018-06-22 stsp 	while (left <= right) {
 527 57b35b75 2018-06-22 stsp 		struct got_packidx_object_id *oid;
 528 40aeb19c 2018-06-22 stsp 		int i, cmp;
 529 a1fd68d8 2018-01-12 stsp 
 530 40aeb19c 2018-06-22 stsp 		i = ((left + right) / 2);
 531 f57598a2 2023-02-12 op 		oid = packidx->hdr.sorted_ids + idlen * i;
 532 f57598a2 2023-02-12 op 		cmp = memcmp(id->hash, oid->hash, idlen);
 533 16dcbf91 2018-04-01 stsp 		if (cmp == 0)
 534 6c00b545 2018-01-17 stsp 			return i;
 535 40aeb19c 2018-06-22 stsp 		else if (cmp > 0)
 536 40aeb19c 2018-06-22 stsp 			left = i + 1;
 537 40aeb19c 2018-06-22 stsp 		else if (cmp < 0)
 538 40aeb19c 2018-06-22 stsp 			right = i - 1;
 539 a1fd68d8 2018-01-12 stsp 	}
 540 a1fd68d8 2018-01-12 stsp 
 541 a1fd68d8 2018-01-12 stsp 	return -1;
 542 67fd6849 2022-02-13 stsp }
 543 67fd6849 2022-02-13 stsp 
 544 67fd6849 2022-02-13 stsp static int
 545 67fd6849 2022-02-13 stsp offset_cmp(const void *pa, const void *pb)
 546 67fd6849 2022-02-13 stsp {
 547 67fd6849 2022-02-13 stsp 	const struct got_pack_offset_index *a, *b;
 548 67fd6849 2022-02-13 stsp 
 549 67fd6849 2022-02-13 stsp 	a = (const struct got_pack_offset_index *)pa;
 550 67fd6849 2022-02-13 stsp 	b = (const struct got_pack_offset_index *)pb;
 551 67fd6849 2022-02-13 stsp 
 552 67fd6849 2022-02-13 stsp 	if (a->offset < b->offset)
 553 67fd6849 2022-02-13 stsp 		return -1;
 554 67fd6849 2022-02-13 stsp 	else if (a->offset > b->offset)
 555 67fd6849 2022-02-13 stsp 		return 1;
 556 67fd6849 2022-02-13 stsp 
 557 67fd6849 2022-02-13 stsp 	return 0;
 558 876c234b 2018-09-10 stsp }
 559 876c234b 2018-09-10 stsp 
 560 67fd6849 2022-02-13 stsp static int
 561 67fd6849 2022-02-13 stsp large_offset_cmp(const void *pa, const void *pb)
 562 67fd6849 2022-02-13 stsp {
 563 67fd6849 2022-02-13 stsp 	const struct got_pack_large_offset_index *a, *b;
 564 67fd6849 2022-02-13 stsp 
 565 67fd6849 2022-02-13 stsp 	a = (const struct got_pack_large_offset_index *)pa;
 566 67fd6849 2022-02-13 stsp 	b = (const struct got_pack_large_offset_index *)pb;
 567 67fd6849 2022-02-13 stsp 
 568 67fd6849 2022-02-13 stsp 	if (a->offset < b->offset)
 569 67fd6849 2022-02-13 stsp 		return -1;
 570 67fd6849 2022-02-13 stsp 	else if (a->offset > b->offset)
 571 67fd6849 2022-02-13 stsp 		return 1;
 572 67fd6849 2022-02-13 stsp 
 573 67fd6849 2022-02-13 stsp 	return 0;
 574 67fd6849 2022-02-13 stsp }
 575 67fd6849 2022-02-13 stsp 
 576 67fd6849 2022-02-13 stsp static const struct got_error *
 577 67fd6849 2022-02-13 stsp build_offset_index(struct got_packidx *p)
 578 67fd6849 2022-02-13 stsp {
 579 67fd6849 2022-02-13 stsp 	uint32_t nobj = be32toh(p->hdr.fanout_table[0xff]);
 580 67fd6849 2022-02-13 stsp 	unsigned int i, j, k;
 581 67fd6849 2022-02-13 stsp 
 582 67fd6849 2022-02-13 stsp 	p->sorted_offsets = calloc(nobj - p->nlargeobj,
 583 67fd6849 2022-02-13 stsp 	    sizeof(p->sorted_offsets[0]));
 584 67fd6849 2022-02-13 stsp 	if (p->sorted_offsets == NULL)
 585 67fd6849 2022-02-13 stsp 		return got_error_from_errno("calloc");
 586 67fd6849 2022-02-13 stsp 
 587 67fd6849 2022-02-13 stsp 	if (p->nlargeobj > 0) {
 588 67fd6849 2022-02-13 stsp 		p->sorted_large_offsets = calloc(p->nlargeobj,
 589 67fd6849 2022-02-13 stsp 		    sizeof(p->sorted_large_offsets[0]));
 590 67fd6849 2022-02-13 stsp 		if (p->sorted_large_offsets == NULL)
 591 67fd6849 2022-02-13 stsp 			return got_error_from_errno("calloc");
 592 67fd6849 2022-02-13 stsp 	}
 593 67fd6849 2022-02-13 stsp 
 594 67fd6849 2022-02-13 stsp 	j = 0;
 595 67fd6849 2022-02-13 stsp 	k = 0;
 596 67fd6849 2022-02-13 stsp 	for (i = 0; i < nobj; i++) {
 597 67fd6849 2022-02-13 stsp 		uint32_t offset = be32toh(p->hdr.offsets[i]);
 598 67fd6849 2022-02-13 stsp 		if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX) {
 599 67fd6849 2022-02-13 stsp 			uint64_t loffset;
 600 67fd6849 2022-02-13 stsp 			uint32_t idx;
 601 67fd6849 2022-02-13 stsp 			idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK;
 602 67fd6849 2022-02-13 stsp 			if (idx >= p->nlargeobj ||
 603 67fd6849 2022-02-13 stsp 			    p->nlargeobj == 0 ||
 604 67fd6849 2022-02-13 stsp 			    p->hdr.large_offsets == NULL)
 605 67fd6849 2022-02-13 stsp 				return got_error(GOT_ERR_BAD_PACKIDX);
 606 67fd6849 2022-02-13 stsp 			loffset = be64toh(p->hdr.large_offsets[idx]);
 607 67fd6849 2022-02-13 stsp 			p->sorted_large_offsets[j].offset = loffset;
 608 67fd6849 2022-02-13 stsp 			p->sorted_large_offsets[j].idx = i;
 609 67fd6849 2022-02-13 stsp 			j++;
 610 67fd6849 2022-02-13 stsp 		} else {
 611 67fd6849 2022-02-13 stsp 			p->sorted_offsets[k].offset = offset;
 612 67fd6849 2022-02-13 stsp 			p->sorted_offsets[k].idx = i;
 613 67fd6849 2022-02-13 stsp 			k++;
 614 67fd6849 2022-02-13 stsp 		}
 615 67fd6849 2022-02-13 stsp 	}
 616 67fd6849 2022-02-13 stsp 	if (j != p->nlargeobj || k != nobj - p->nlargeobj)
 617 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
 618 67fd6849 2022-02-13 stsp 
 619 67fd6849 2022-02-13 stsp 	qsort(p->sorted_offsets, nobj - p->nlargeobj,
 620 67fd6849 2022-02-13 stsp 	    sizeof(p->sorted_offsets[0]), offset_cmp);
 621 67fd6849 2022-02-13 stsp 
 622 67fd6849 2022-02-13 stsp 	if (p->sorted_large_offsets)
 623 67fd6849 2022-02-13 stsp 		qsort(p->sorted_large_offsets, p->nlargeobj,
 624 67fd6849 2022-02-13 stsp 		    sizeof(p->sorted_large_offsets[0]), large_offset_cmp);
 625 67fd6849 2022-02-13 stsp 
 626 67fd6849 2022-02-13 stsp 	return NULL;
 627 67fd6849 2022-02-13 stsp }
 628 67fd6849 2022-02-13 stsp 
 629 876c234b 2018-09-10 stsp const struct got_error *
 630 67fd6849 2022-02-13 stsp got_packidx_get_offset_idx(int *idx, struct got_packidx *packidx, off_t offset)
 631 67fd6849 2022-02-13 stsp {
 632 67fd6849 2022-02-13 stsp 	const struct got_error *err;
 633 67fd6849 2022-02-13 stsp 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 634 67fd6849 2022-02-13 stsp 	int i, left, right;
 635 67fd6849 2022-02-13 stsp 
 636 67fd6849 2022-02-13 stsp 	*idx = -1;
 637 67fd6849 2022-02-13 stsp 
 638 67fd6849 2022-02-13 stsp 	if (packidx->sorted_offsets == NULL) {
 639 67fd6849 2022-02-13 stsp 		err = build_offset_index(packidx);
 640 67fd6849 2022-02-13 stsp 		if (err)
 641 67fd6849 2022-02-13 stsp 			return err;
 642 67fd6849 2022-02-13 stsp 	}
 643 67fd6849 2022-02-13 stsp 
 644 67fd6849 2022-02-13 stsp 	if (offset >= 0x7fffffff) {
 645 67fd6849 2022-02-13 stsp 		uint64_t lo;
 646 67fd6849 2022-02-13 stsp 		left = 0, right = packidx->nlargeobj - 1;
 647 67fd6849 2022-02-13 stsp 		while (left <= right) {
 648 67fd6849 2022-02-13 stsp 			i = ((left + right) / 2);
 649 67fd6849 2022-02-13 stsp 			lo = packidx->sorted_large_offsets[i].offset;
 650 67fd6849 2022-02-13 stsp 			if (lo == offset) {
 651 67fd6849 2022-02-13 stsp 				*idx = packidx->sorted_large_offsets[i].idx;
 652 67fd6849 2022-02-13 stsp 				break;
 653 67fd6849 2022-02-13 stsp 			} else if (offset > lo)
 654 67fd6849 2022-02-13 stsp 				left = i + 1;
 655 67fd6849 2022-02-13 stsp 			else if (offset < lo)
 656 67fd6849 2022-02-13 stsp 				right = i - 1;
 657 67fd6849 2022-02-13 stsp 		}
 658 67fd6849 2022-02-13 stsp 	} else {
 659 67fd6849 2022-02-13 stsp 		uint32_t o;
 660 67fd6849 2022-02-13 stsp 		left = 0, right = totobj - packidx->nlargeobj - 1;
 661 67fd6849 2022-02-13 stsp 		while (left <= right) {
 662 67fd6849 2022-02-13 stsp 			i = ((left + right) / 2);
 663 67fd6849 2022-02-13 stsp 			o = packidx->sorted_offsets[i].offset;
 664 67fd6849 2022-02-13 stsp 			if (o == offset) {
 665 67fd6849 2022-02-13 stsp 				*idx = packidx->sorted_offsets[i].idx;
 666 67fd6849 2022-02-13 stsp 				break;
 667 67fd6849 2022-02-13 stsp 			} else if (offset > o)
 668 67fd6849 2022-02-13 stsp 				left = i + 1;
 669 67fd6849 2022-02-13 stsp 			else if (offset < o)
 670 67fd6849 2022-02-13 stsp 				right = i - 1;
 671 67fd6849 2022-02-13 stsp 		}
 672 67fd6849 2022-02-13 stsp 	}
 673 67fd6849 2022-02-13 stsp 
 674 67fd6849 2022-02-13 stsp 	return NULL;
 675 67fd6849 2022-02-13 stsp }
 676 67fd6849 2022-02-13 stsp 
 677 67fd6849 2022-02-13 stsp const struct got_error *
 678 67fd6849 2022-02-13 stsp got_packidx_get_object_id(struct got_object_id *id,
 679 67fd6849 2022-02-13 stsp     struct got_packidx *packidx, int idx)
 680 67fd6849 2022-02-13 stsp {
 681 67fd6849 2022-02-13 stsp 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 682 67fd6849 2022-02-13 stsp 	struct got_packidx_object_id *oid;
 683 f57598a2 2023-02-12 op 	size_t idlen;
 684 67fd6849 2022-02-13 stsp 
 685 42b6bfc8 2023-02-12 op 	idlen = got_hash_digest_length(packidx->algo);
 686 f57598a2 2023-02-12 op 
 687 67fd6849 2022-02-13 stsp 	if (idx < 0 || idx >= totobj)
 688 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_NO_OBJ);
 689 67fd6849 2022-02-13 stsp 
 690 f57598a2 2023-02-12 op 	oid = packidx->hdr.sorted_ids + (idx * idlen);
 691 f57598a2 2023-02-12 op 	memcpy(id->hash, oid->hash, idlen);
 692 67fd6849 2022-02-13 stsp 	return NULL;
 693 67fd6849 2022-02-13 stsp }
 694 67fd6849 2022-02-13 stsp 
 695 67fd6849 2022-02-13 stsp const struct got_error *
 696 dd88155e 2019-06-29 stsp got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
 697 4277420a 2019-06-29 stsp     struct got_packidx *packidx, const char *id_str_prefix)
 698 e09a504c 2019-06-28 stsp {
 699 dd88155e 2019-06-29 stsp 	const struct got_error *err = NULL;
 700 4277420a 2019-06-29 stsp 	u_int8_t id0;
 701 78fb0967 2020-09-09 naddy 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
 702 4277420a 2019-06-29 stsp 	char hex[3];
 703 f57598a2 2023-02-12 op 	size_t idlen, prefix_len = strlen(id_str_prefix);
 704 e09a504c 2019-06-28 stsp 	struct got_packidx_object_id *oid;
 705 404bde06 2022-01-03 stsp 	uint32_t i = 0;
 706 e09a504c 2019-06-28 stsp 
 707 42b6bfc8 2023-02-12 op 	idlen = got_hash_digest_length(packidx->algo);
 708 f57598a2 2023-02-12 op 
 709 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(matched_ids);
 710 4277420a 2019-06-29 stsp 
 711 4277420a 2019-06-29 stsp 	if (prefix_len < 2)
 712 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 713 4277420a 2019-06-29 stsp 
 714 4277420a 2019-06-29 stsp 	hex[0] = id_str_prefix[0];
 715 4277420a 2019-06-29 stsp 	hex[1] = id_str_prefix[1];
 716 4277420a 2019-06-29 stsp 	hex[2] = '\0';
 717 4277420a 2019-06-29 stsp 	if (!got_parse_xdigit(&id0, hex))
 718 6dd1ece6 2019-11-10 stsp 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 719 4277420a 2019-06-29 stsp 
 720 404bde06 2022-01-03 stsp 	if (id0 > 0)
 721 404bde06 2022-01-03 stsp 		i = be32toh(packidx->hdr.fanout_table[id0 - 1]);
 722 f57598a2 2023-02-12 op 	oid = packidx->hdr.sorted_ids + i * idlen;
 723 a41a7d4a 2023-02-12 op 	while (i < totobj && oid->hash[0] == id0) {
 724 82f7e4c8 2023-02-12 op 		char id_str[GOT_OBJECT_ID_HEX_MAXLEN];
 725 dd88155e 2019-06-29 stsp 		struct got_object_qid *qid;
 726 4277420a 2019-06-29 stsp 		int cmp;
 727 4277420a 2019-06-29 stsp 
 728 a41a7d4a 2023-02-12 op 		if (!got_hash_digest_to_str(oid->hash, id_str, sizeof(id_str),
 729 42b6bfc8 2023-02-12 op 		    packidx->algo))
 730 4277420a 2019-06-29 stsp 		        return got_error(GOT_ERR_NO_SPACE);
 731 4277420a 2019-06-29 stsp 
 732 4277420a 2019-06-29 stsp 		cmp = strncmp(id_str, id_str_prefix, prefix_len);
 733 4277420a 2019-06-29 stsp 		if (cmp < 0) {
 734 4277420a 2019-06-29 stsp 			oid = &packidx->hdr.sorted_ids[++i];
 735 4277420a 2019-06-29 stsp 			continue;
 736 4277420a 2019-06-29 stsp 		} else if (cmp > 0)
 737 e09a504c 2019-06-28 stsp 			break;
 738 4277420a 2019-06-29 stsp 
 739 dd88155e 2019-06-29 stsp 		err = got_object_qid_alloc_partial(&qid);
 740 dd88155e 2019-06-29 stsp 		if (err)
 741 dd88155e 2019-06-29 stsp 			break;
 742 f57598a2 2023-02-12 op 		memcpy(qid->id.hash, oid->hash, idlen);
 743 dbdddfee 2021-06-23 naddy 		STAILQ_INSERT_TAIL(matched_ids, qid, entry);
 744 4277420a 2019-06-29 stsp 
 745 f57598a2 2023-02-12 op 		i++;
 746 f57598a2 2023-02-12 op 		oid = packidx->hdr.sorted_ids + i * idlen;
 747 e09a504c 2019-06-28 stsp 	}
 748 e09a504c 2019-06-28 stsp 
 749 0adc7bcc 2019-06-29 stsp 	if (err)
 750 0adc7bcc 2019-06-29 stsp 		got_object_id_queue_free(matched_ids);
 751 3d589bee 2022-06-25 stsp 	return err;
 752 3d589bee 2022-06-25 stsp }
 753 3d589bee 2022-06-25 stsp 
 754 3d589bee 2022-06-25 stsp static void
 755 3d589bee 2022-06-25 stsp set_max_datasize(void)
 756 3d589bee 2022-06-25 stsp {
 757 3d589bee 2022-06-25 stsp 	struct rlimit rl;
 758 3d589bee 2022-06-25 stsp 
 759 3d589bee 2022-06-25 stsp 	if (getrlimit(RLIMIT_DATA, &rl) != 0)
 760 3d589bee 2022-06-25 stsp 		return;
 761 3d589bee 2022-06-25 stsp 
 762 3d589bee 2022-06-25 stsp 	rl.rlim_cur = rl.rlim_max;
 763 3d589bee 2022-06-25 stsp 	setrlimit(RLIMIT_DATA, &rl);
 764 3d589bee 2022-06-25 stsp }
 765 3d589bee 2022-06-25 stsp 
 766 3d589bee 2022-06-25 stsp const struct got_error *
 767 3d589bee 2022-06-25 stsp got_pack_start_privsep_child(struct got_pack *pack, struct got_packidx *packidx)
 768 3d589bee 2022-06-25 stsp {
 769 3d589bee 2022-06-25 stsp 	const struct got_error *err = NULL;
 770 3d589bee 2022-06-25 stsp 	int imsg_fds[2];
 771 3d589bee 2022-06-25 stsp 	pid_t pid;
 772 3d589bee 2022-06-25 stsp 	struct imsgbuf *ibuf;
 773 3d589bee 2022-06-25 stsp 
 774 3d589bee 2022-06-25 stsp 	ibuf = calloc(1, sizeof(*ibuf));
 775 3d589bee 2022-06-25 stsp 	if (ibuf == NULL)
 776 3d589bee 2022-06-25 stsp 		return got_error_from_errno("calloc");
 777 3d589bee 2022-06-25 stsp 
 778 3d589bee 2022-06-25 stsp 	pack->privsep_child = calloc(1, sizeof(*pack->privsep_child));
 779 3d589bee 2022-06-25 stsp 	if (pack->privsep_child == NULL) {
 780 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("calloc");
 781 3d589bee 2022-06-25 stsp 		free(ibuf);
 782 3d589bee 2022-06-25 stsp 		return err;
 783 3d589bee 2022-06-25 stsp 	}
 784 3d589bee 2022-06-25 stsp 	pack->child_has_tempfiles = 0;
 785 3d589bee 2022-06-25 stsp 	pack->child_has_delta_outfd = 0;
 786 3d589bee 2022-06-25 stsp 
 787 3d589bee 2022-06-25 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
 788 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("socketpair");
 789 3d589bee 2022-06-25 stsp 		goto done;
 790 3d589bee 2022-06-25 stsp 	}
 791 3d589bee 2022-06-25 stsp 
 792 3d589bee 2022-06-25 stsp 	pid = fork();
 793 3d589bee 2022-06-25 stsp 	if (pid == -1) {
 794 3d589bee 2022-06-25 stsp 		err = got_error_from_errno("fork");
 795 3d589bee 2022-06-25 stsp 		goto done;
 796 3d589bee 2022-06-25 stsp 	} else if (pid == 0) {
 797 3d589bee 2022-06-25 stsp 		set_max_datasize();
 798 3d589bee 2022-06-25 stsp 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_PACK,
 799 3d589bee 2022-06-25 stsp 		    pack->path_packfile);
 800 3d589bee 2022-06-25 stsp 		/* not reached */
 801 3d589bee 2022-06-25 stsp 	}
 802 3d589bee 2022-06-25 stsp 
 803 3d589bee 2022-06-25 stsp 	if (close(imsg_fds[1]) == -1)
 804 3d589bee 2022-06-25 stsp 		return got_error_from_errno("close");
 805 3d589bee 2022-06-25 stsp 	pack->privsep_child->imsg_fd = imsg_fds[0];
 806 3d589bee 2022-06-25 stsp 	pack->privsep_child->pid = pid;
 807 3d589bee 2022-06-25 stsp 	imsg_init(ibuf, imsg_fds[0]);
 808 3d589bee 2022-06-25 stsp 	pack->privsep_child->ibuf = ibuf;
 809 3d589bee 2022-06-25 stsp 
 810 3d589bee 2022-06-25 stsp 	err = got_privsep_init_pack_child(ibuf, pack, packidx);
 811 3d589bee 2022-06-25 stsp 	if (err) {
 812 3d589bee 2022-06-25 stsp 		const struct got_error *child_err;
 813 3d589bee 2022-06-25 stsp 		err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 814 3d589bee 2022-06-25 stsp 		child_err = got_privsep_wait_for_child(
 815 3d589bee 2022-06-25 stsp 		    pack->privsep_child->pid);
 816 3d589bee 2022-06-25 stsp 		if (child_err && err == NULL)
 817 3d589bee 2022-06-25 stsp 			err = child_err;
 818 3d589bee 2022-06-25 stsp 	}
 819 3d589bee 2022-06-25 stsp done:
 820 3d589bee 2022-06-25 stsp 	if (err) {
 821 3d589bee 2022-06-25 stsp 		free(ibuf);
 822 3d589bee 2022-06-25 stsp 		free(pack->privsep_child);
 823 3d589bee 2022-06-25 stsp 		pack->privsep_child = NULL;
 824 3d589bee 2022-06-25 stsp 	}
 825 dd88155e 2019-06-29 stsp 	return err;
 826 e09a504c 2019-06-28 stsp }
 827 e09a504c 2019-06-28 stsp 
 828 b4f37570 2021-06-19 stsp static const struct got_error *
 829 b4f37570 2021-06-19 stsp pack_stop_privsep_child(struct got_pack *pack)
 830 876c234b 2018-09-10 stsp {
 831 74ef8aae 2022-10-24 stsp 	const struct got_error *err = NULL, *close_err = NULL;
 832 876c234b 2018-09-10 stsp 
 833 876c234b 2018-09-10 stsp 	if (pack->privsep_child == NULL)
 834 876c234b 2018-09-10 stsp 		return NULL;
 835 876c234b 2018-09-10 stsp 
 836 876c234b 2018-09-10 stsp 	err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
 837 96732e0b 2018-11-11 stsp 	if (err)
 838 96732e0b 2018-11-11 stsp 		return err;
 839 74ef8aae 2022-10-24 stsp 	if (close(pack->privsep_child->imsg_fd) == -1)
 840 74ef8aae 2022-10-24 stsp 		close_err = got_error_from_errno("close");
 841 96732e0b 2018-11-11 stsp 	err = got_privsep_wait_for_child(pack->privsep_child->pid);
 842 74ef8aae 2022-10-24 stsp 	if (close_err && err == NULL)
 843 74ef8aae 2022-10-24 stsp 		err = close_err;
 844 74ef8aae 2022-10-24 stsp 	imsg_clear(pack->privsep_child->ibuf);
 845 cc2a8ef4 2021-06-19 tracey 	free(pack->privsep_child->ibuf);
 846 876c234b 2018-09-10 stsp 	free(pack->privsep_child);
 847 876c234b 2018-09-10 stsp 	pack->privsep_child = NULL;
 848 876c234b 2018-09-10 stsp 	return err;
 849 7e656b93 2018-03-17 stsp }
 850 7e656b93 2018-03-17 stsp 
 851 d7464085 2018-07-09 stsp const struct got_error *
 852 7e656b93 2018-03-17 stsp got_pack_close(struct got_pack *pack)
 853 7e656b93 2018-03-17 stsp {
 854 d7464085 2018-07-09 stsp 	const struct got_error *err = NULL;
 855 d7464085 2018-07-09 stsp 
 856 b4f37570 2021-06-19 stsp 	err = pack_stop_privsep_child(pack);
 857 876c234b 2018-09-10 stsp 	if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
 858 638f9024 2019-05-13 stsp 		err = got_error_from_errno("munmap");
 859 08578a35 2021-01-22 stsp 	if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL)
 860 638f9024 2019-05-13 stsp 		err = got_error_from_errno("close");
 861 8b2180d4 2018-04-26 stsp 	pack->fd = -1;
 862 4589e373 2018-03-17 stsp 	free(pack->path_packfile);
 863 4589e373 2018-03-17 stsp 	pack->path_packfile = NULL;
 864 4589e373 2018-03-17 stsp 	pack->filesize = 0;
 865 ab2f42e7 2019-11-10 stsp 	if (pack->delta_cache) {
 866 ab2f42e7 2019-11-10 stsp 		got_delta_cache_free(pack->delta_cache);
 867 ab2f42e7 2019-11-10 stsp 		pack->delta_cache = NULL;
 868 ab2f42e7 2019-11-10 stsp 	}
 869 7e656b93 2018-03-17 stsp 
 870 57160834 2022-05-31 stsp 	/*
 871 57160834 2022-05-31 stsp 	 * Leave accumfd and basefd alone. They are managed by the
 872 57160834 2022-05-31 stsp 	 * repository layer and can be reused.
 873 57160834 2022-05-31 stsp 	 */
 874 57160834 2022-05-31 stsp 
 875 c7fe698a 2018-01-23 stsp 	return err;
 876 c7fe698a 2018-01-23 stsp }
 877 c7fe698a 2018-01-23 stsp 
 878 668a20f6 2020-03-18 stsp const struct got_error *
 879 668a20f6 2020-03-18 stsp got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
 880 d7464085 2018-07-09 stsp     struct got_pack *pack, off_t offset)
 881 a487c1d0 2018-01-14 stsp {
 882 a487c1d0 2018-01-14 stsp 	uint8_t t = 0;
 883 a487c1d0 2018-01-14 stsp 	uint64_t s = 0;
 884 a487c1d0 2018-01-14 stsp 	uint8_t sizeN;
 885 d7464085 2018-07-09 stsp 	size_t mapoff = 0;
 886 a487c1d0 2018-01-14 stsp 	int i = 0;
 887 d7464085 2018-07-09 stsp 
 888 d7464085 2018-07-09 stsp 	*len = 0;
 889 d7464085 2018-07-09 stsp 
 890 d7464085 2018-07-09 stsp 	if (offset >= pack->filesize)
 891 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
 892 d7464085 2018-07-09 stsp 
 893 d7464085 2018-07-09 stsp 	if (pack->map) {
 894 ad4cc361 2022-10-27 op 		if (offset > SIZE_MAX) {
 895 ad4cc361 2022-10-27 op 			return got_error_fmt(GOT_ERR_PACK_OFFSET,
 896 ad4cc361 2022-10-27 op 			    "offset %lld overflows size_t",
 897 ad4cc361 2022-10-27 op 			    (long long)offset);
 898 ad4cc361 2022-10-27 op 		}
 899 ad4cc361 2022-10-27 op 
 900 d7464085 2018-07-09 stsp 		mapoff = (size_t)offset;
 901 d7464085 2018-07-09 stsp 	} else {
 902 d7464085 2018-07-09 stsp 		if (lseek(pack->fd, offset, SEEK_SET) == -1)
 903 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
 904 d7464085 2018-07-09 stsp 	}
 905 a487c1d0 2018-01-14 stsp 
 906 a1fd68d8 2018-01-12 stsp 	do {
 907 a1fd68d8 2018-01-12 stsp 		/* We do not support size values which don't fit in 64 bit. */
 908 a487c1d0 2018-01-14 stsp 		if (i > 9)
 909 09ee8ded 2022-10-20 stsp 			return got_error_fmt(GOT_ERR_OBJ_TOO_LARGE,
 910 e082ed67 2022-10-24 naddy 			    "packfile offset %lld", (long long)offset);
 911 a1fd68d8 2018-01-12 stsp 
 912 d7464085 2018-07-09 stsp 		if (pack->map) {
 913 3976db15 2022-01-10 stsp 			if (mapoff + sizeof(sizeN) >= pack->filesize)
 914 3976db15 2022-01-10 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 915 d7464085 2018-07-09 stsp 			sizeN = *(pack->map + mapoff);
 916 d7464085 2018-07-09 stsp 			mapoff += sizeof(sizeN);
 917 d7464085 2018-07-09 stsp 		} else {
 918 d7464085 2018-07-09 stsp 			ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
 919 d7464085 2018-07-09 stsp 			if (n < 0)
 920 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 921 d7464085 2018-07-09 stsp 			if (n != sizeof(sizeN))
 922 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 923 d7464085 2018-07-09 stsp 		}
 924 d7464085 2018-07-09 stsp 		*len += sizeof(sizeN);
 925 8251fdbc 2018-01-12 stsp 
 926 a1fd68d8 2018-01-12 stsp 		if (i == 0) {
 927 a487c1d0 2018-01-14 stsp 			t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK) >>
 928 a1fd68d8 2018-01-12 stsp 			    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT;
 929 a487c1d0 2018-01-14 stsp 			s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK);
 930 a1fd68d8 2018-01-12 stsp 		} else {
 931 a1fd68d8 2018-01-12 stsp 			size_t shift = 4 + 7 * (i - 1);
 932 a487c1d0 2018-01-14 stsp 			s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK) << shift);
 933 a1fd68d8 2018-01-12 stsp 		}
 934 a1fd68d8 2018-01-12 stsp 		i++;
 935 a1fd68d8 2018-01-12 stsp 	} while (sizeN & GOT_PACK_OBJ_SIZE_MORE);
 936 a1fd68d8 2018-01-12 stsp 
 937 a487c1d0 2018-01-14 stsp 	*type = t;
 938 a487c1d0 2018-01-14 stsp 	*size = s;
 939 a487c1d0 2018-01-14 stsp 	return NULL;
 940 0a0a3048 2018-01-10 stsp }
 941 c54542a0 2018-01-13 stsp 
 942 a1fd68d8 2018-01-12 stsp static const struct got_error *
 943 5f25cc85 2019-11-26 stsp open_plain_object(struct got_object **obj, struct got_object_id *id,
 944 5f25cc85 2019-11-26 stsp     uint8_t type, off_t offset, size_t size, int idx)
 945 6ccb713b 2018-01-19 stsp {
 946 6ccb713b 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
 947 6ccb713b 2018-01-19 stsp 	if (*obj == NULL)
 948 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 949 6ccb713b 2018-01-19 stsp 
 950 6ccb713b 2018-01-19 stsp 	(*obj)->type = type;
 951 6ccb713b 2018-01-19 stsp 	(*obj)->flags = GOT_OBJ_FLAG_PACKED;
 952 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
 953 6ccb713b 2018-01-19 stsp 	(*obj)->hdrlen = 0;
 954 6ccb713b 2018-01-19 stsp 	(*obj)->size = size;
 955 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
 956 6ccb713b 2018-01-19 stsp 	(*obj)->pack_offset = offset;
 957 b107e67f 2018-01-19 stsp 
 958 b107e67f 2018-01-19 stsp 	return NULL;
 959 b107e67f 2018-01-19 stsp }
 960 b107e67f 2018-01-19 stsp 
 961 b107e67f 2018-01-19 stsp static const struct got_error *
 962 d7464085 2018-07-09 stsp parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
 963 d7464085 2018-07-09 stsp     off_t delta_offset)
 964 b107e67f 2018-01-19 stsp {
 965 b107e67f 2018-01-19 stsp 	int64_t o = 0;
 966 b107e67f 2018-01-19 stsp 	uint8_t offN;
 967 b107e67f 2018-01-19 stsp 	int i = 0;
 968 b107e67f 2018-01-19 stsp 
 969 a0de39f3 2019-08-09 stsp 	*offset = 0;
 970 d7464085 2018-07-09 stsp 	*len = 0;
 971 d7464085 2018-07-09 stsp 
 972 b107e67f 2018-01-19 stsp 	do {
 973 b107e67f 2018-01-19 stsp 		/* We do not support offset values which don't fit in 64 bit. */
 974 b107e67f 2018-01-19 stsp 		if (i > 8)
 975 b107e67f 2018-01-19 stsp 			return got_error(GOT_ERR_NO_SPACE);
 976 b107e67f 2018-01-19 stsp 
 977 d7464085 2018-07-09 stsp 		if (pack->map) {
 978 d7464085 2018-07-09 stsp 			size_t mapoff;
 979 ad4cc361 2022-10-27 op 
 980 ad4cc361 2022-10-27 op 			if (delta_offset + *len > SIZE_MAX) {
 981 ad4cc361 2022-10-27 op 				return got_error_fmt(GOT_ERR_PACK_OFFSET,
 982 ad4cc361 2022-10-27 op 				    "mapoff %lld would overflow size_t",
 983 ad4cc361 2022-10-27 op 				    (long long)delta_offset + *len);
 984 ad4cc361 2022-10-27 op 			}
 985 ad4cc361 2022-10-27 op 
 986 d7464085 2018-07-09 stsp 			mapoff = (size_t)delta_offset + *len;
 987 3976db15 2022-01-10 stsp 			if (mapoff + sizeof(offN) >= pack->filesize)
 988 3976db15 2022-01-10 stsp 				return got_error(GOT_ERR_PACK_OFFSET);
 989 d7464085 2018-07-09 stsp 			offN = *(pack->map + mapoff);
 990 d7464085 2018-07-09 stsp 		} else {
 991 d7464085 2018-07-09 stsp 			ssize_t n;
 992 d7464085 2018-07-09 stsp 			n = read(pack->fd, &offN, sizeof(offN));
 993 d7464085 2018-07-09 stsp 			if (n < 0)
 994 638f9024 2019-05-13 stsp 				return got_error_from_errno("read");
 995 d7464085 2018-07-09 stsp 			if (n != sizeof(offN))
 996 d7464085 2018-07-09 stsp 				return got_error(GOT_ERR_BAD_PACKFILE);
 997 d7464085 2018-07-09 stsp 		}
 998 d7464085 2018-07-09 stsp 		*len += sizeof(offN);
 999 b107e67f 2018-01-19 stsp 
1000 b107e67f 2018-01-19 stsp 		if (i == 0)
1001 b107e67f 2018-01-19 stsp 			o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
1002 b107e67f 2018-01-19 stsp 		else {
1003 cecc778e 2018-01-23 stsp 			o++;
1004 b107e67f 2018-01-19 stsp 			o <<= 7;
1005 cecc778e 2018-01-23 stsp 			o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK);
1006 b107e67f 2018-01-19 stsp 		}
1007 b107e67f 2018-01-19 stsp 		i++;
1008 b107e67f 2018-01-19 stsp 	} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE);
1009 6ccb713b 2018-01-19 stsp 
1010 b107e67f 2018-01-19 stsp 	*offset = o;
1011 6ccb713b 2018-01-19 stsp 	return NULL;
1012 6ccb713b 2018-01-19 stsp }
1013 6ccb713b 2018-01-19 stsp 
1014 668a20f6 2020-03-18 stsp const struct got_error *
1015 c0df5966 2021-12-31 stsp got_pack_parse_offset_delta(off_t *base_offset, size_t *len,
1016 24d916d2 2022-10-24 op     struct got_pack *pack, off_t offset, size_t tslen)
1017 b107e67f 2018-01-19 stsp {
1018 96f5e8b3 2018-01-23 stsp 	const struct got_error *err;
1019 b107e67f 2018-01-19 stsp 	int64_t negoffset;
1020 b107e67f 2018-01-19 stsp 	size_t negofflen;
1021 b107e67f 2018-01-19 stsp 
1022 d7464085 2018-07-09 stsp 	*len = 0;
1023 d7464085 2018-07-09 stsp 
1024 d7464085 2018-07-09 stsp 	err = parse_negative_offset(&negoffset, &negofflen, pack,
1025 d7464085 2018-07-09 stsp 	    offset + tslen);
1026 b107e67f 2018-01-19 stsp 	if (err)
1027 b107e67f 2018-01-19 stsp 		return err;
1028 b107e67f 2018-01-19 stsp 
1029 b107e67f 2018-01-19 stsp 	/* Compute the base object's offset (must be in the same pack file). */
1030 96f5e8b3 2018-01-23 stsp 	*base_offset = (offset - negoffset);
1031 96f5e8b3 2018-01-23 stsp 	if (*base_offset <= 0)
1032 b107e67f 2018-01-19 stsp 		return got_error(GOT_ERR_BAD_PACKFILE);
1033 b107e67f 2018-01-19 stsp 
1034 d7464085 2018-07-09 stsp 	*len = negofflen;
1035 96f5e8b3 2018-01-23 stsp 	return NULL;
1036 96f5e8b3 2018-01-23 stsp }
1037 96f5e8b3 2018-01-23 stsp 
1038 0e22967e 2018-02-11 stsp static const struct got_error *
1039 42c69117 2019-11-10 stsp read_delta_data(uint8_t **delta_buf, size_t *delta_len,
1040 2d9e6abf 2022-05-04 stsp     size_t *delta_compressed_len, size_t delta_data_offset,
1041 2d9e6abf 2022-05-04 stsp     struct got_pack *pack)
1042 42c69117 2019-11-10 stsp {
1043 42c69117 2019-11-10 stsp 	const struct got_error *err = NULL;
1044 2d9e6abf 2022-05-04 stsp 	size_t consumed = 0;
1045 42c69117 2019-11-10 stsp 
1046 42c69117 2019-11-10 stsp 	if (pack->map) {
1047 42c69117 2019-11-10 stsp 		if (delta_data_offset >= pack->filesize)
1048 42c69117 2019-11-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1049 2e5a6fad 2020-03-18 stsp 		err = got_inflate_to_mem_mmap(delta_buf, delta_len,
1050 2d9e6abf 2022-05-04 stsp 		    &consumed, NULL, pack->map, delta_data_offset,
1051 2e5a6fad 2020-03-18 stsp 		    pack->filesize - delta_data_offset);
1052 2d9e6abf 2022-05-04 stsp 		if (err)
1053 2d9e6abf 2022-05-04 stsp 			return err;
1054 42c69117 2019-11-10 stsp 	} else {
1055 42c69117 2019-11-10 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1)
1056 42c69117 2019-11-10 stsp 			return got_error_from_errno("lseek");
1057 2d9e6abf 2022-05-04 stsp 		err = got_inflate_to_mem_fd(delta_buf, delta_len,
1058 2d9e6abf 2022-05-04 stsp 		    &consumed, NULL, 0, pack->fd);
1059 2d9e6abf 2022-05-04 stsp 		if (err)
1060 2d9e6abf 2022-05-04 stsp 			return err;
1061 42c69117 2019-11-10 stsp 	}
1062 2d9e6abf 2022-05-04 stsp 
1063 2d9e6abf 2022-05-04 stsp 	if (delta_compressed_len)
1064 2d9e6abf 2022-05-04 stsp 		*delta_compressed_len = consumed;
1065 2d9e6abf 2022-05-04 stsp 
1066 2d9e6abf 2022-05-04 stsp 	return NULL;
1067 42c69117 2019-11-10 stsp }
1068 a3500804 2018-01-23 stsp 
1069 96f5e8b3 2018-01-23 stsp static const struct got_error *
1070 c336f889 2018-07-23 stsp add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
1071 e5792992 2022-10-28 op     int delta_type, size_t delta_size, off_t delta_data_offset)
1072 bdd2fbb3 2018-02-11 stsp {
1073 bdd2fbb3 2018-02-11 stsp 	struct got_delta *delta;
1074 bdd2fbb3 2018-02-11 stsp 
1075 c336f889 2018-07-23 stsp 	delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
1076 42c69117 2019-11-10 stsp 	    delta_data_offset);
1077 bdd2fbb3 2018-02-11 stsp 	if (delta == NULL)
1078 638f9024 2019-05-13 stsp 		return got_error_from_errno("got_delta_open");
1079 bdd2fbb3 2018-02-11 stsp 	/* delta is freed in got_object_close() */
1080 bdd2fbb3 2018-02-11 stsp 	deltas->nentries++;
1081 dbdddfee 2021-06-23 naddy 	STAILQ_INSERT_HEAD(&deltas->entries, delta, entry);
1082 bdd2fbb3 2018-02-11 stsp 	return NULL;
1083 bdd2fbb3 2018-02-11 stsp }
1084 bdd2fbb3 2018-02-11 stsp 
1085 bdd2fbb3 2018-02-11 stsp static const struct got_error *
1086 6b9c9673 2018-01-23 stsp resolve_offset_delta(struct got_delta_chain *deltas,
1087 c8ecd499 2018-09-09 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1088 c8ecd499 2018-09-09 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1089 a3500804 2018-01-23 stsp {
1090 a3500804 2018-01-23 stsp 	const struct got_error *err;
1091 c3703302 2018-01-23 stsp 	off_t base_offset;
1092 c3703302 2018-01-23 stsp 	uint8_t base_type;
1093 c3703302 2018-01-23 stsp 	uint64_t base_size;
1094 c3703302 2018-01-23 stsp 	size_t base_tslen;
1095 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1096 42c69117 2019-11-10 stsp 	size_t consumed;
1097 a3500804 2018-01-23 stsp 
1098 668a20f6 2020-03-18 stsp 	err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
1099 d7464085 2018-07-09 stsp 	    delta_offset, tslen);
1100 a3500804 2018-01-23 stsp 	if (err)
1101 a3500804 2018-01-23 stsp 		return err;
1102 a3500804 2018-01-23 stsp 
1103 d7464085 2018-07-09 stsp 	delta_data_offset = delta_offset + tslen + consumed;
1104 d7464085 2018-07-09 stsp 	if (delta_data_offset >= pack->filesize)
1105 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1106 a53d2f13 2018-03-17 stsp 
1107 d7464085 2018-07-09 stsp 	if (pack->map == NULL) {
1108 d7464085 2018-07-09 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1109 d7464085 2018-07-09 stsp 		if (delta_data_offset == -1)
1110 638f9024 2019-05-13 stsp 			return got_error_from_errno("lseek");
1111 d7464085 2018-07-09 stsp 	}
1112 bdd2fbb3 2018-02-11 stsp 
1113 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1114 e5792992 2022-10-28 op 	    delta_data_offset);
1115 bdd2fbb3 2018-02-11 stsp 	if (err)
1116 1a35c1bc 2019-05-22 stsp 		return err;
1117 bdd2fbb3 2018-02-11 stsp 
1118 c3703302 2018-01-23 stsp 	/* An offset delta must be in the same packfile. */
1119 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1120 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1121 b107e67f 2018-01-19 stsp 
1122 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1123 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1124 b107e67f 2018-01-19 stsp 	if (err)
1125 1a35c1bc 2019-05-22 stsp 		return err;
1126 b107e67f 2018-01-19 stsp 
1127 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1128 b0e2201a 2018-06-22 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1129 c3703302 2018-01-23 stsp }
1130 c4330eff 2021-06-22 stsp 
1131 c4330eff 2021-06-22 stsp const struct got_error *
1132 c4330eff 2021-06-22 stsp got_pack_parse_ref_delta(struct got_object_id *id,
1133 c4330eff 2021-06-22 stsp     struct got_pack *pack, off_t delta_offset, int tslen)
1134 c4330eff 2021-06-22 stsp {
1135 079a296c 2023-02-12 op 	size_t idlen;
1136 079a296c 2023-02-12 op 
1137 079a296c 2023-02-12 op 	idlen = got_hash_digest_length(pack->algo);
1138 079a296c 2023-02-12 op 	memset(id, 0, sizeof(*id));
1139 079a296c 2023-02-12 op 
1140 c4330eff 2021-06-22 stsp 	if (pack->map) {
1141 ad4cc361 2022-10-27 op 		size_t mapoff;
1142 ad4cc361 2022-10-27 op 
1143 ad4cc361 2022-10-27 op 		if (delta_offset + tslen > SIZE_MAX) {
1144 ad4cc361 2022-10-27 op 			return got_error_fmt(GOT_ERR_PACK_OFFSET,
1145 ad4cc361 2022-10-27 op 			    "mapoff %lld would overflow size_t",
1146 ad4cc361 2022-10-27 op 			    (long long)delta_offset + tslen);
1147 ad4cc361 2022-10-27 op 		}
1148 ad4cc361 2022-10-27 op 
1149 ad4cc361 2022-10-27 op 		mapoff = delta_offset + tslen;
1150 079a296c 2023-02-12 op 		if (mapoff + idlen >= pack->filesize)
1151 3976db15 2022-01-10 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1152 079a296c 2023-02-12 op 		memcpy(id->hash, pack->map + mapoff, idlen);
1153 c4330eff 2021-06-22 stsp 	} else {
1154 c4330eff 2021-06-22 stsp 		ssize_t n;
1155 079a296c 2023-02-12 op 		n = read(pack->fd, id->hash, idlen);
1156 c4330eff 2021-06-22 stsp 		if (n < 0)
1157 c4330eff 2021-06-22 stsp 			return got_error_from_errno("read");
1158 c4330eff 2021-06-22 stsp 		if (n != sizeof(*id))
1159 c4330eff 2021-06-22 stsp 			return got_error(GOT_ERR_BAD_PACKFILE);
1160 c4330eff 2021-06-22 stsp 	}
1161 c3703302 2018-01-23 stsp 
1162 c4330eff 2021-06-22 stsp 	return NULL;
1163 c4330eff 2021-06-22 stsp }
1164 c4330eff 2021-06-22 stsp 
1165 c3703302 2018-01-23 stsp static const struct got_error *
1166 c8ecd499 2018-09-09 stsp resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
1167 c8ecd499 2018-09-09 stsp     struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
1168 c8ecd499 2018-09-09 stsp     size_t delta_size, unsigned int recursion)
1169 c3703302 2018-01-23 stsp {
1170 6b9c9673 2018-01-23 stsp 	const struct got_error *err;
1171 6b9c9673 2018-01-23 stsp 	struct got_object_id id;
1172 6b9c9673 2018-01-23 stsp 	int idx;
1173 6b9c9673 2018-01-23 stsp 	off_t base_offset;
1174 6b9c9673 2018-01-23 stsp 	uint8_t base_type;
1175 6b9c9673 2018-01-23 stsp 	uint64_t base_size;
1176 6b9c9673 2018-01-23 stsp 	size_t base_tslen;
1177 bdd2fbb3 2018-02-11 stsp 	off_t delta_data_offset;
1178 6b9c9673 2018-01-23 stsp 
1179 42c69117 2019-11-10 stsp 	if (delta_offset + tslen >= pack->filesize)
1180 d7464085 2018-07-09 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1181 a53d2f13 2018-03-17 stsp 
1182 c4330eff 2021-06-22 stsp 	err = got_pack_parse_ref_delta(&id, pack, delta_offset, tslen);
1183 c4330eff 2021-06-22 stsp 	if (err)
1184 c4330eff 2021-06-22 stsp 		return err;
1185 d7464085 2018-07-09 stsp 	if (pack->map) {
1186 c4330eff 2021-06-22 stsp 		delta_data_offset = delta_offset + tslen + sizeof(id);
1187 d7464085 2018-07-09 stsp 	} else {
1188 e40b19ed 2020-01-06 stsp 		delta_data_offset = lseek(pack->fd, 0, SEEK_CUR);
1189 e40b19ed 2020-01-06 stsp 		if (delta_data_offset == -1)
1190 e40b19ed 2020-01-06 stsp 			return got_error_from_errno("lseek");
1191 d7464085 2018-07-09 stsp 	}
1192 d7464085 2018-07-09 stsp 
1193 c336f889 2018-07-23 stsp 	err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
1194 e5792992 2022-10-28 op 	    delta_data_offset);
1195 bdd2fbb3 2018-02-11 stsp 	if (err)
1196 1a35c1bc 2019-05-22 stsp 		return err;
1197 bdd2fbb3 2018-02-11 stsp 
1198 652b2703 2018-06-22 stsp 	/* Delta base must be in the same pack file. */
1199 1510f469 2018-09-09 stsp 	idx = got_packidx_get_object_idx(packidx, &id);
1200 1a35c1bc 2019-05-22 stsp 	if (idx == -1)
1201 668a20f6 2020-03-18 stsp 		return got_error(GOT_ERR_NO_OBJ);
1202 6b9c9673 2018-01-23 stsp 
1203 02828bfd 2021-06-22 stsp 	base_offset = got_packidx_get_object_offset(packidx, idx);
1204 04aed155 2022-07-24 naddy 	if (base_offset == -1)
1205 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1206 6b9c9673 2018-01-23 stsp 
1207 1a35c1bc 2019-05-22 stsp 	if (base_offset >= pack->filesize)
1208 1a35c1bc 2019-05-22 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1209 6b9c9673 2018-01-23 stsp 
1210 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&base_type, &base_size,
1211 668a20f6 2020-03-18 stsp 	    &base_tslen, pack, base_offset);
1212 6b9c9673 2018-01-23 stsp 	if (err)
1213 1a35c1bc 2019-05-22 stsp 		return err;
1214 6b9c9673 2018-01-23 stsp 
1215 668a20f6 2020-03-18 stsp 	return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
1216 0c048b15 2018-04-27 stsp 	    base_tslen, base_type, base_size, recursion - 1);
1217 6b9c9673 2018-01-23 stsp }
1218 6b9c9673 2018-01-23 stsp 
1219 668a20f6 2020-03-18 stsp const struct got_error *
1220 668a20f6 2020-03-18 stsp got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
1221 668a20f6 2020-03-18 stsp     struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
1222 668a20f6 2020-03-18 stsp     size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
1223 6b9c9673 2018-01-23 stsp {
1224 c3703302 2018-01-23 stsp 	const struct got_error *err = NULL;
1225 c3703302 2018-01-23 stsp 
1226 5b7e13a7 2018-04-02 stsp 	if (--recursion == 0)
1227 5b7e13a7 2018-04-02 stsp 		return got_error(GOT_ERR_RECURSION);
1228 5b7e13a7 2018-04-02 stsp 
1229 c3703302 2018-01-23 stsp 	switch (delta_type) {
1230 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_COMMIT:
1231 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TREE:
1232 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_BLOB:
1233 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_TAG:
1234 c3703302 2018-01-23 stsp 		/* Plain types are the final delta base. Recursion ends. */
1235 c336f889 2018-07-23 stsp 		err = add_delta(deltas, delta_offset, tslen, delta_type,
1236 42c69117 2019-11-10 stsp 		    delta_size, 0);
1237 4e8cda55 2018-01-19 stsp 		break;
1238 a3500804 2018-01-23 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1239 c8ecd499 2018-09-09 stsp 		err = resolve_offset_delta(deltas, packidx, pack,
1240 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1241 96f5e8b3 2018-01-23 stsp 		break;
1242 4e8cda55 2018-01-19 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1243 c8ecd499 2018-09-09 stsp 		err = resolve_ref_delta(deltas, packidx, pack,
1244 b0e2201a 2018-06-22 stsp 		    delta_offset, tslen, delta_type, delta_size, recursion - 1);
1245 6b9c9673 2018-01-23 stsp 		break;
1246 4e8cda55 2018-01-19 stsp 	default:
1247 4810de4a 2018-04-01 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1248 4e8cda55 2018-01-19 stsp 	}
1249 96f5e8b3 2018-01-23 stsp 
1250 96f5e8b3 2018-01-23 stsp 	return err;
1251 96f5e8b3 2018-01-23 stsp }
1252 96f5e8b3 2018-01-23 stsp 
1253 96f5e8b3 2018-01-23 stsp static const struct got_error *
1254 a98c62b1 2018-09-09 stsp open_delta_object(struct got_object **obj, struct got_packidx *packidx,
1255 a98c62b1 2018-09-09 stsp     struct got_pack *pack, struct got_object_id *id, off_t offset,
1256 c59b3346 2018-09-11 stsp     size_t tslen, int delta_type, size_t delta_size, int idx)
1257 96f5e8b3 2018-01-23 stsp {
1258 96f5e8b3 2018-01-23 stsp 	const struct got_error *err = NULL;
1259 96f5e8b3 2018-01-23 stsp 	int resolved_type;
1260 4e8cda55 2018-01-19 stsp 
1261 b107e67f 2018-01-19 stsp 	*obj = calloc(1, sizeof(**obj));
1262 b107e67f 2018-01-19 stsp 	if (*obj == NULL)
1263 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
1264 b107e67f 2018-01-19 stsp 
1265 96f5e8b3 2018-01-23 stsp 	(*obj)->flags = 0;
1266 b107e67f 2018-01-19 stsp 	(*obj)->hdrlen = 0;
1267 39e73dc9 2018-03-03 stsp 	(*obj)->size = 0; /* Not known because deltas aren't applied yet. */
1268 106807b4 2018-09-15 stsp 	memcpy(&(*obj)->id, id, sizeof((*obj)->id));
1269 cecc778e 2018-01-23 stsp 	(*obj)->pack_offset = offset + tslen;
1270 1a35c1bc 2019-05-22 stsp 
1271 dbdddfee 2021-06-23 naddy 	STAILQ_INIT(&(*obj)->deltas.entries);
1272 1a35c1bc 2019-05-22 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED;
1273 96f5e8b3 2018-01-23 stsp 	(*obj)->flags |= GOT_OBJ_FLAG_PACKED;
1274 c59b3346 2018-09-11 stsp 	(*obj)->pack_idx = idx;
1275 96f5e8b3 2018-01-23 stsp 
1276 668a20f6 2020-03-18 stsp 	err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
1277 668a20f6 2020-03-18 stsp 	    offset, tslen, delta_type, delta_size,
1278 668a20f6 2020-03-18 stsp 	    GOT_DELTA_CHAIN_RECURSION_MAX);
1279 96f5e8b3 2018-01-23 stsp 	if (err)
1280 96f5e8b3 2018-01-23 stsp 		goto done;
1281 96f5e8b3 2018-01-23 stsp 
1282 96f5e8b3 2018-01-23 stsp 	err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
1283 96f5e8b3 2018-01-23 stsp 	if (err)
1284 96f5e8b3 2018-01-23 stsp 		goto done;
1285 96f5e8b3 2018-01-23 stsp 	(*obj)->type = resolved_type;
1286 96f5e8b3 2018-01-23 stsp done:
1287 96f5e8b3 2018-01-23 stsp 	if (err) {
1288 96f5e8b3 2018-01-23 stsp 		got_object_close(*obj);
1289 96f5e8b3 2018-01-23 stsp 		*obj = NULL;
1290 96f5e8b3 2018-01-23 stsp 	}
1291 96f5e8b3 2018-01-23 stsp 	return err;
1292 b107e67f 2018-01-19 stsp }
1293 b107e67f 2018-01-19 stsp 
1294 2090a03d 2018-09-09 stsp const struct got_error *
1295 2090a03d 2018-09-09 stsp got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
1296 6fd11751 2018-06-04 stsp     struct got_packidx *packidx, int idx, struct got_object_id *id)
1297 a1fd68d8 2018-01-12 stsp {
1298 a1fd68d8 2018-01-12 stsp 	const struct got_error *err = NULL;
1299 a1fd68d8 2018-01-12 stsp 	off_t offset;
1300 6c00b545 2018-01-17 stsp 	uint8_t type;
1301 6c00b545 2018-01-17 stsp 	uint64_t size;
1302 3ee5fc21 2018-01-17 stsp 	size_t tslen;
1303 a1fd68d8 2018-01-12 stsp 
1304 6c00b545 2018-01-17 stsp 	*obj = NULL;
1305 a1fd68d8 2018-01-12 stsp 
1306 02828bfd 2021-06-22 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1307 04aed155 2022-07-24 naddy 	if (offset == -1)
1308 a1fd68d8 2018-01-12 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1309 a1fd68d8 2018-01-12 stsp 
1310 668a20f6 2020-03-18 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1311 668a20f6 2020-03-18 stsp 	    pack, offset);
1312 a1fd68d8 2018-01-12 stsp 	if (err)
1313 35c73765 2018-09-09 stsp 		return err;
1314 a1fd68d8 2018-01-12 stsp 
1315 6c00b545 2018-01-17 stsp 	switch (type) {
1316 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_COMMIT:
1317 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_TREE:
1318 6c00b545 2018-01-17 stsp 	case GOT_OBJ_TYPE_BLOB:
1319 d33fc9ef 2018-01-23 stsp 	case GOT_OBJ_TYPE_TAG:
1320 5f25cc85 2019-11-26 stsp 		err = open_plain_object(obj, id, type, offset + tslen,
1321 5f25cc85 2019-11-26 stsp 		    size, idx);
1322 6c00b545 2018-01-17 stsp 		break;
1323 b107e67f 2018-01-19 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1324 a48db7e5 2018-01-23 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1325 a98c62b1 2018-09-09 stsp 		err = open_delta_object(obj, packidx, pack, id, offset,
1326 c59b3346 2018-09-11 stsp 		    tslen, type, size, idx);
1327 b107e67f 2018-01-19 stsp 		break;
1328 6c00b545 2018-01-17 stsp 	default:
1329 4810de4a 2018-04-01 stsp 		err = got_error(GOT_ERR_OBJ_TYPE);
1330 35c73765 2018-09-09 stsp 		break;
1331 35c73765 2018-09-09 stsp 	}
1332 35c73765 2018-09-09 stsp 
1333 3ee5fc21 2018-01-17 stsp 	return err;
1334 3ee5fc21 2018-01-17 stsp }
1335 efd2a263 2018-01-19 stsp 
1336 d582f26c 2020-03-18 stsp const struct got_error *
1337 c0df5966 2021-12-31 stsp got_pack_get_delta_chain_max_size(uint64_t *max_size,
1338 c0df5966 2021-12-31 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1339 22484865 2018-03-13 stsp {
1340 22484865 2018-03-13 stsp 	struct got_delta *delta;
1341 22484865 2018-03-13 stsp 	uint64_t base_size = 0, result_size = 0;
1342 22484865 2018-03-13 stsp 
1343 22484865 2018-03-13 stsp 	*max_size = 0;
1344 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1345 22484865 2018-03-13 stsp 		/* Plain object types are the delta base. */
1346 22484865 2018-03-13 stsp 		if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1347 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TREE &&
1348 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_BLOB &&
1349 22484865 2018-03-13 stsp 		    delta->type != GOT_OBJ_TYPE_TAG) {
1350 22484865 2018-03-13 stsp 			const struct got_error *err;
1351 aabb25f8 2022-10-17 stsp 			uint8_t *delta_buf = NULL;
1352 42c69117 2019-11-10 stsp 			size_t delta_len;
1353 ab2f42e7 2019-11-10 stsp 			int cached = 1;
1354 42c69117 2019-11-10 stsp 
1355 aabb25f8 2022-10-17 stsp 			if (pack->delta_cache) {
1356 aabb25f8 2022-10-17 stsp 				got_delta_cache_get(&delta_buf, &delta_len,
1357 aabb25f8 2022-10-17 stsp 				    pack->delta_cache, delta->data_offset);
1358 aabb25f8 2022-10-17 stsp 			}
1359 ab2f42e7 2019-11-10 stsp 			if (delta_buf == NULL) {
1360 ab2f42e7 2019-11-10 stsp 				cached = 0;
1361 ab2f42e7 2019-11-10 stsp 				err = read_delta_data(&delta_buf, &delta_len,
1362 2d9e6abf 2022-05-04 stsp 				    NULL, delta->data_offset, pack);
1363 ab2f42e7 2019-11-10 stsp 				if (err)
1364 ab2f42e7 2019-11-10 stsp 					return err;
1365 aabb25f8 2022-10-17 stsp 			}
1366 aabb25f8 2022-10-17 stsp 			if (pack->delta_cache && !cached) {
1367 ab2f42e7 2019-11-10 stsp 				err = got_delta_cache_add(pack->delta_cache,
1368 ab2f42e7 2019-11-10 stsp 				    delta->data_offset, delta_buf, delta_len);
1369 ab2f42e7 2019-11-10 stsp 				if (err == NULL)
1370 ab2f42e7 2019-11-10 stsp 					cached = 1;
1371 ab2f42e7 2019-11-10 stsp 				else if (err->code != GOT_ERR_NO_SPACE) {
1372 ab2f42e7 2019-11-10 stsp 					free(delta_buf);
1373 ab2f42e7 2019-11-10 stsp 					return err;
1374 ab2f42e7 2019-11-10 stsp 				}
1375 ab2f42e7 2019-11-10 stsp 			}
1376 a53d2f13 2018-03-17 stsp 			err = got_delta_get_sizes(&base_size, &result_size,
1377 42c69117 2019-11-10 stsp 			    delta_buf, delta_len);
1378 ab2f42e7 2019-11-10 stsp 			if (!cached)
1379 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1380 22484865 2018-03-13 stsp 			if (err)
1381 22484865 2018-03-13 stsp 				return err;
1382 22484865 2018-03-13 stsp 		} else
1383 22484865 2018-03-13 stsp 			base_size = delta->size;
1384 22484865 2018-03-13 stsp 		if (base_size > *max_size)
1385 22484865 2018-03-13 stsp 			*max_size = base_size;
1386 22484865 2018-03-13 stsp 		if (result_size > *max_size)
1387 22484865 2018-03-13 stsp 			*max_size = result_size;
1388 22484865 2018-03-13 stsp 	}
1389 bd1223b9 2018-03-14 stsp 
1390 9feb4ff2 2018-03-14 stsp 	return NULL;
1391 ac544f8c 2019-01-13 stsp }
1392 ac544f8c 2019-01-13 stsp 
1393 ac544f8c 2019-01-13 stsp const struct got_error *
1394 42c69117 2019-11-10 stsp got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
1395 42c69117 2019-11-10 stsp     struct got_pack *pack)
1396 ac544f8c 2019-01-13 stsp {
1397 85a703fa 2019-01-13 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0)
1398 85a703fa 2019-01-13 stsp 		return got_error(GOT_ERR_OBJ_TYPE);
1399 85a703fa 2019-01-13 stsp 
1400 d582f26c 2020-03-18 stsp 	return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1401 22484865 2018-03-13 stsp }
1402 22484865 2018-03-13 stsp 
1403 668a20f6 2020-03-18 stsp const struct got_error *
1404 4788f1ce 2020-03-18 stsp got_pack_dump_delta_chain_to_file(size_t *result_size,
1405 4788f1ce 2020-03-18 stsp     struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
1406 4788f1ce 2020-03-18 stsp     FILE *base_file, FILE *accum_file)
1407 efd2a263 2018-01-19 stsp {
1408 efd2a263 2018-01-19 stsp 	const struct got_error *err = NULL;
1409 6691714a 2018-01-23 stsp 	struct got_delta *delta;
1410 aabb25f8 2022-10-17 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1411 6395114c 2022-05-31 stsp 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1412 6395114c 2022-05-31 stsp 	/* We process small enough files entirely in memory for speed. */
1413 6395114c 2022-05-31 stsp 	const size_t max_bufsize = GOT_DELTA_RESULT_SIZE_CACHED_MAX;
1414 6395114c 2022-05-31 stsp 	uint64_t max_size = 0;
1415 6691714a 2018-01-23 stsp 	int n = 0;
1416 b29656e2 2018-03-16 stsp 
1417 b29656e2 2018-03-16 stsp 	*result_size = 0;
1418 3ee5fc21 2018-01-17 stsp 
1419 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1420 6691714a 2018-01-23 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1421 efd2a263 2018-01-19 stsp 
1422 6395114c 2022-05-31 stsp 	if (fseeko(base_file, 0L, SEEK_SET) == -1)
1423 6395114c 2022-05-31 stsp 		return got_error_from_errno("fseeko");
1424 6395114c 2022-05-31 stsp 	if (fseeko(accum_file, 0L, SEEK_SET) == -1)
1425 6395114c 2022-05-31 stsp 		return got_error_from_errno("fseeko");
1426 efd2a263 2018-01-19 stsp 
1427 6691714a 2018-01-23 stsp 	/* Deltas are ordered in ascending order. */
1428 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1429 aabb25f8 2022-10-17 stsp 		uint8_t *delta_buf = NULL;
1430 6395114c 2022-05-31 stsp 		uint64_t base_size, result_size = 0;
1431 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1432 a6b158cc 2018-02-11 stsp 		if (n == 0) {
1433 34fca9c3 2018-11-11 stsp 			size_t mapoff;
1434 0c048b15 2018-04-27 stsp 			off_t delta_data_offset;
1435 9db65d41 2018-03-14 stsp 
1436 a6b158cc 2018-02-11 stsp 			/* Plain object types are the delta base. */
1437 a6b158cc 2018-02-11 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1438 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1439 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1440 a6b158cc 2018-02-11 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1441 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1442 72eb3431 2018-04-01 stsp 				goto done;
1443 72eb3431 2018-04-01 stsp 			}
1444 72eb3431 2018-04-01 stsp 
1445 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1446 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1447 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1448 0c048b15 2018-04-27 stsp 				goto done;
1449 0c048b15 2018-04-27 stsp 			}
1450 d7464085 2018-07-09 stsp 			if (pack->map == NULL) {
1451 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1452 d7464085 2018-07-09 stsp 				    == -1) {
1453 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1454 d7464085 2018-07-09 stsp 					goto done;
1455 d7464085 2018-07-09 stsp 				}
1456 bdd2fbb3 2018-02-11 stsp 			}
1457 6395114c 2022-05-31 stsp 			if (delta->size > max_size)
1458 6395114c 2022-05-31 stsp 				max_size = delta->size;
1459 6395114c 2022-05-31 stsp 			if (max_size > max_bufsize) {
1460 d7464085 2018-07-09 stsp 				if (pack->map) {
1461 ad4cc361 2022-10-27 op 					if (delta_data_offset > SIZE_MAX) {
1462 ad4cc361 2022-10-27 op 						return got_error_fmt(
1463 ad4cc361 2022-10-27 op 						    GOT_ERR_RANGE,
1464 ad4cc361 2022-10-27 op 						    "delta offset %lld "
1465 ad4cc361 2022-10-27 op 						    "overflows size_t",
1466 ad4cc361 2022-10-27 op 						    (long long)
1467 ad4cc361 2022-10-27 op 						    delta_data_offset);
1468 ad4cc361 2022-10-27 op 					}
1469 ad4cc361 2022-10-27 op 
1470 ad4cc361 2022-10-27 op 					mapoff = delta_data_offset;
1471 d7464085 2018-07-09 stsp 					err = got_inflate_to_file_mmap(
1472 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->map,
1473 4788f1ce 2020-03-18 stsp 					    mapoff, pack->filesize - mapoff,
1474 4788f1ce 2020-03-18 stsp 					    base_file);
1475 d7464085 2018-07-09 stsp 				} else
1476 34fca9c3 2018-11-11 stsp 					err = got_inflate_to_file_fd(
1477 4788f1ce 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, pack->fd,
1478 4788f1ce 2020-03-18 stsp 					    base_file);
1479 d7464085 2018-07-09 stsp 			} else {
1480 6395114c 2022-05-31 stsp 				accum_buf = malloc(max_size);
1481 6395114c 2022-05-31 stsp 				if (accum_buf == NULL) {
1482 6395114c 2022-05-31 stsp 					err = got_error_from_errno("malloc");
1483 6395114c 2022-05-31 stsp 					goto done;
1484 6395114c 2022-05-31 stsp 				}
1485 6395114c 2022-05-31 stsp 				accum_bufsz = max_size;
1486 d7464085 2018-07-09 stsp 				if (pack->map) {
1487 ad4cc361 2022-10-27 op 					if (delta_data_offset > SIZE_MAX) {
1488 ad4cc361 2022-10-27 op 						return got_error_fmt(
1489 ad4cc361 2022-10-27 op 						    GOT_ERR_RANGE,
1490 ad4cc361 2022-10-27 op 						    "delta offset %lld "
1491 ad4cc361 2022-10-27 op 						    "overflows size_t",
1492 ad4cc361 2022-10-27 op 						    (long long)
1493 ad4cc361 2022-10-27 op 						    delta_data_offset);
1494 ad4cc361 2022-10-27 op 					}
1495 ad4cc361 2022-10-27 op 
1496 ad4cc361 2022-10-27 op 					mapoff = delta_data_offset;
1497 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_mmap(&base_buf,
1498 2e5a6fad 2020-03-18 stsp 					    &base_bufsz, NULL, NULL,
1499 2e5a6fad 2020-03-18 stsp 					    pack->map, mapoff,
1500 d7464085 2018-07-09 stsp 					    pack->filesize - mapoff);
1501 d7464085 2018-07-09 stsp 				} else
1502 d7464085 2018-07-09 stsp 					err = got_inflate_to_mem_fd(&base_buf,
1503 55fdd257 2020-03-18 stsp 					    &base_bufsz, NULL, NULL, max_size,
1504 55fdd257 2020-03-18 stsp 					    pack->fd);
1505 8628c62d 2018-03-15 stsp 			}
1506 a6b158cc 2018-02-11 stsp 			if (err)
1507 a6b158cc 2018-02-11 stsp 				goto done;
1508 a6b158cc 2018-02-11 stsp 			n++;
1509 6395114c 2022-05-31 stsp 			if (base_buf == NULL)
1510 8628c62d 2018-03-15 stsp 				rewind(base_file);
1511 a6b158cc 2018-02-11 stsp 			continue;
1512 9db65d41 2018-03-14 stsp 		}
1513 885d3e02 2018-01-27 stsp 
1514 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache) {
1515 aabb25f8 2022-10-17 stsp 			got_delta_cache_get(&delta_buf, &delta_len,
1516 aabb25f8 2022-10-17 stsp 			    pack->delta_cache, delta->data_offset);
1517 aabb25f8 2022-10-17 stsp 		}
1518 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1519 ab2f42e7 2019-11-10 stsp 			cached = 0;
1520 2d9e6abf 2022-05-04 stsp 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1521 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1522 ab2f42e7 2019-11-10 stsp 			if (err)
1523 ab2f42e7 2019-11-10 stsp 				goto done;
1524 aabb25f8 2022-10-17 stsp 		}
1525 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache && !cached) {
1526 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1527 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1528 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1529 ab2f42e7 2019-11-10 stsp 				cached = 1;
1530 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1531 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1532 ab2f42e7 2019-11-10 stsp 				goto done;
1533 ab2f42e7 2019-11-10 stsp 			}
1534 ab2f42e7 2019-11-10 stsp 		}
1535 6395114c 2022-05-31 stsp 
1536 6395114c 2022-05-31 stsp 		err = got_delta_get_sizes(&base_size, &result_size,
1537 6395114c 2022-05-31 stsp 		    delta_buf, delta_len);
1538 e62fc520 2022-11-08 stsp 		if (err) {
1539 e62fc520 2022-11-08 stsp 			if (!cached)
1540 e62fc520 2022-11-08 stsp 				free(delta_buf);
1541 6395114c 2022-05-31 stsp 			goto done;
1542 e62fc520 2022-11-08 stsp 		}
1543 6395114c 2022-05-31 stsp 		if (base_size > max_size)
1544 6395114c 2022-05-31 stsp 			max_size = base_size;
1545 6395114c 2022-05-31 stsp 		if (result_size > max_size)
1546 6395114c 2022-05-31 stsp 			max_size = result_size;
1547 6395114c 2022-05-31 stsp 
1548 6395114c 2022-05-31 stsp 		if (base_buf && max_size > max_bufsize) {
1549 6395114c 2022-05-31 stsp 			/* Switch from buffers to temporary files. */
1550 6395114c 2022-05-31 stsp 			size_t w = fwrite(base_buf, 1, base_bufsz,
1551 6395114c 2022-05-31 stsp 			    base_file);
1552 6395114c 2022-05-31 stsp 			if (w != base_bufsz) {
1553 6395114c 2022-05-31 stsp 				err = got_ferror(outfile, GOT_ERR_IO);
1554 e62fc520 2022-11-08 stsp 				if (!cached)
1555 e62fc520 2022-11-08 stsp 					free(delta_buf);
1556 6395114c 2022-05-31 stsp 				goto done;
1557 6395114c 2022-05-31 stsp 			}
1558 6395114c 2022-05-31 stsp 			free(base_buf);
1559 6395114c 2022-05-31 stsp 			base_buf = NULL;
1560 6395114c 2022-05-31 stsp 			free(accum_buf);
1561 6395114c 2022-05-31 stsp 			accum_buf = NULL;
1562 6395114c 2022-05-31 stsp 		}
1563 6395114c 2022-05-31 stsp 
1564 6395114c 2022-05-31 stsp 		if (base_buf && max_size > base_bufsz) {
1565 6395114c 2022-05-31 stsp 			uint8_t *p = realloc(base_buf, max_size);
1566 6395114c 2022-05-31 stsp 			if (p == NULL) {
1567 6395114c 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1568 e62fc520 2022-11-08 stsp 				if (!cached)
1569 e62fc520 2022-11-08 stsp 					free(delta_buf);
1570 6395114c 2022-05-31 stsp 				goto done;
1571 6395114c 2022-05-31 stsp 			}
1572 6395114c 2022-05-31 stsp 			base_buf = p;
1573 6395114c 2022-05-31 stsp 			base_bufsz = max_size;
1574 6395114c 2022-05-31 stsp 		}
1575 6395114c 2022-05-31 stsp 
1576 6395114c 2022-05-31 stsp 		if (accum_buf && max_size > accum_bufsz) {
1577 6395114c 2022-05-31 stsp 			uint8_t *p = realloc(accum_buf, max_size);
1578 6395114c 2022-05-31 stsp 			if (p == NULL) {
1579 6395114c 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1580 e62fc520 2022-11-08 stsp 				if (!cached)
1581 e62fc520 2022-11-08 stsp 					free(delta_buf);
1582 6395114c 2022-05-31 stsp 				goto done;
1583 6395114c 2022-05-31 stsp 			}
1584 6395114c 2022-05-31 stsp 			accum_buf = p;
1585 6395114c 2022-05-31 stsp 			accum_bufsz = max_size;
1586 6395114c 2022-05-31 stsp 		}
1587 6395114c 2022-05-31 stsp 
1588 8628c62d 2018-03-15 stsp 		if (base_buf) {
1589 34fca9c3 2018-11-11 stsp 			err = got_delta_apply_in_mem(base_buf, base_bufsz,
1590 42c69117 2019-11-10 stsp 			    delta_buf, delta_len, accum_buf,
1591 34fca9c3 2018-11-11 stsp 			    &accum_size, max_size);
1592 8628c62d 2018-03-15 stsp 			n++;
1593 8628c62d 2018-03-15 stsp 		} else {
1594 42c69117 2019-11-10 stsp 			err = got_delta_apply(base_file, delta_buf,
1595 42c69117 2019-11-10 stsp 			    delta_len,
1596 8628c62d 2018-03-15 stsp 			    /* Final delta application writes to output file. */
1597 b29656e2 2018-03-16 stsp 			    ++n < deltas->nentries ? accum_file : outfile,
1598 b29656e2 2018-03-16 stsp 			    &accum_size);
1599 8628c62d 2018-03-15 stsp 		}
1600 ab2f42e7 2019-11-10 stsp 		if (!cached)
1601 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1602 6691714a 2018-01-23 stsp 		if (err)
1603 6691714a 2018-01-23 stsp 			goto done;
1604 6691714a 2018-01-23 stsp 
1605 710bb5ca 2018-01-23 stsp 		if (n < deltas->nentries) {
1606 6691714a 2018-01-23 stsp 			/* Accumulated delta becomes the new base. */
1607 8628c62d 2018-03-15 stsp 			if (base_buf) {
1608 8628c62d 2018-03-15 stsp 				uint8_t *tmp = accum_buf;
1609 6395114c 2022-05-31 stsp 				size_t tmp_size = accum_bufsz;
1610 8628c62d 2018-03-15 stsp 				accum_buf = base_buf;
1611 6395114c 2022-05-31 stsp 				accum_bufsz = base_bufsz;
1612 8628c62d 2018-03-15 stsp 				base_buf = tmp;
1613 6395114c 2022-05-31 stsp 				base_bufsz = tmp_size;
1614 8628c62d 2018-03-15 stsp 			} else {
1615 8628c62d 2018-03-15 stsp 				FILE *tmp = accum_file;
1616 8628c62d 2018-03-15 stsp 				accum_file = base_file;
1617 8628c62d 2018-03-15 stsp 				base_file = tmp;
1618 8628c62d 2018-03-15 stsp 				rewind(base_file);
1619 8628c62d 2018-03-15 stsp 				rewind(accum_file);
1620 8628c62d 2018-03-15 stsp 			}
1621 6691714a 2018-01-23 stsp 		}
1622 6691714a 2018-01-23 stsp 	}
1623 6691714a 2018-01-23 stsp 
1624 6691714a 2018-01-23 stsp done:
1625 8628c62d 2018-03-15 stsp 	free(base_buf);
1626 8628c62d 2018-03-15 stsp 	if (accum_buf) {
1627 8628c62d 2018-03-15 stsp 		size_t len = fwrite(accum_buf, 1, accum_size, outfile);
1628 8628c62d 2018-03-15 stsp 		free(accum_buf);
1629 8628c62d 2018-03-15 stsp 		if (len != accum_size)
1630 673702af 2018-07-23 stsp 			err = got_ferror(outfile, GOT_ERR_IO);
1631 8628c62d 2018-03-15 stsp 	}
1632 6691714a 2018-01-23 stsp 	rewind(outfile);
1633 b29656e2 2018-03-16 stsp 	if (err == NULL)
1634 b29656e2 2018-03-16 stsp 		*result_size = accum_size;
1635 e0ab43e7 2018-03-16 stsp 	return err;
1636 e0ab43e7 2018-03-16 stsp }
1637 e0ab43e7 2018-03-16 stsp 
1638 668a20f6 2020-03-18 stsp const struct got_error *
1639 668a20f6 2020-03-18 stsp got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
1640 48095039 2018-09-09 stsp     struct got_delta_chain *deltas, struct got_pack *pack)
1641 e0ab43e7 2018-03-16 stsp {
1642 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1643 e0ab43e7 2018-03-16 stsp 	struct got_delta *delta;
1644 aabb25f8 2022-10-17 stsp 	uint8_t *base_buf = NULL, *accum_buf = NULL;
1645 f18c433a 2022-05-31 stsp 	size_t base_bufsz = 0, accum_bufsz = 0, accum_size = 0, delta_len;
1646 f18c433a 2022-05-31 stsp 	uint64_t max_size = 0;
1647 e0ab43e7 2018-03-16 stsp 	int n = 0;
1648 e0ab43e7 2018-03-16 stsp 
1649 e0ab43e7 2018-03-16 stsp 	*outbuf = NULL;
1650 e0ab43e7 2018-03-16 stsp 	*outlen = 0;
1651 e0ab43e7 2018-03-16 stsp 
1652 dbdddfee 2021-06-23 naddy 	if (STAILQ_EMPTY(&deltas->entries))
1653 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_BAD_DELTA_CHAIN);
1654 e0ab43e7 2018-03-16 stsp 
1655 e0ab43e7 2018-03-16 stsp 	/* Deltas are ordered in ascending order. */
1656 dbdddfee 2021-06-23 naddy 	STAILQ_FOREACH(delta, &deltas->entries, entry) {
1657 aabb25f8 2022-10-17 stsp 		uint8_t *delta_buf = NULL;
1658 f18c433a 2022-05-31 stsp 		uint64_t base_size, result_size = 0;
1659 ab2f42e7 2019-11-10 stsp 		int cached = 1;
1660 e0ab43e7 2018-03-16 stsp 		if (n == 0) {
1661 ad4cc361 2022-10-27 op 			off_t delta_data_offset;
1662 e0ab43e7 2018-03-16 stsp 
1663 e0ab43e7 2018-03-16 stsp 			/* Plain object types are the delta base. */
1664 e0ab43e7 2018-03-16 stsp 			if (delta->type != GOT_OBJ_TYPE_COMMIT &&
1665 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TREE &&
1666 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_BLOB &&
1667 e0ab43e7 2018-03-16 stsp 			    delta->type != GOT_OBJ_TYPE_TAG) {
1668 72eb3431 2018-04-01 stsp 				err = got_error(GOT_ERR_BAD_DELTA_CHAIN);
1669 72eb3431 2018-04-01 stsp 				goto done;
1670 72eb3431 2018-04-01 stsp 			}
1671 72eb3431 2018-04-01 stsp 
1672 0c048b15 2018-04-27 stsp 			delta_data_offset = delta->offset + delta->tslen;
1673 0c048b15 2018-04-27 stsp 			if (delta_data_offset >= pack->filesize) {
1674 0c048b15 2018-04-27 stsp 				err = got_error(GOT_ERR_PACK_OFFSET);
1675 0c048b15 2018-04-27 stsp 				goto done;
1676 0c048b15 2018-04-27 stsp 			}
1677 f18c433a 2022-05-31 stsp 
1678 f18c433a 2022-05-31 stsp 			if (delta->size > max_size)
1679 f18c433a 2022-05-31 stsp 				max_size = delta->size;
1680 f18c433a 2022-05-31 stsp 
1681 d7464085 2018-07-09 stsp 			if (pack->map) {
1682 ad4cc361 2022-10-27 op 				size_t mapoff;
1683 ad4cc361 2022-10-27 op 
1684 ad4cc361 2022-10-27 op 				if (delta_data_offset > SIZE_MAX) {
1685 ad4cc361 2022-10-27 op 					return got_error_fmt(GOT_ERR_RANGE,
1686 ad4cc361 2022-10-27 op 					    "delta %lld offset would "
1687 ad4cc361 2022-10-27 op 					    "overflow size_t",
1688 ad4cc361 2022-10-27 op 					    (long long)delta_data_offset);
1689 ad4cc361 2022-10-27 op 				}
1690 ad4cc361 2022-10-27 op 
1691 ad4cc361 2022-10-27 op 				mapoff = delta_data_offset;
1692 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_mmap(&base_buf,
1693 2e5a6fad 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, pack->map,
1694 2e5a6fad 2020-03-18 stsp 				    mapoff, pack->filesize - mapoff);
1695 d7464085 2018-07-09 stsp 			} else {
1696 d7464085 2018-07-09 stsp 				if (lseek(pack->fd, delta_data_offset, SEEK_SET)
1697 d7464085 2018-07-09 stsp 				    == -1) {
1698 638f9024 2019-05-13 stsp 					err = got_error_from_errno("lseek");
1699 d7464085 2018-07-09 stsp 					goto done;
1700 d7464085 2018-07-09 stsp 				}
1701 d7464085 2018-07-09 stsp 				err = got_inflate_to_mem_fd(&base_buf,
1702 55fdd257 2020-03-18 stsp 				    &base_bufsz, NULL, NULL, max_size,
1703 55fdd257 2020-03-18 stsp 				    pack->fd);
1704 e0ab43e7 2018-03-16 stsp 			}
1705 d7464085 2018-07-09 stsp 			if (err)
1706 d7464085 2018-07-09 stsp 				goto done;
1707 e0ab43e7 2018-03-16 stsp 			n++;
1708 e0ab43e7 2018-03-16 stsp 			continue;
1709 e0ab43e7 2018-03-16 stsp 		}
1710 e0ab43e7 2018-03-16 stsp 
1711 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache) {
1712 aabb25f8 2022-10-17 stsp 			got_delta_cache_get(&delta_buf, &delta_len,
1713 aabb25f8 2022-10-17 stsp 			    pack->delta_cache, delta->data_offset);
1714 aabb25f8 2022-10-17 stsp 		}
1715 ab2f42e7 2019-11-10 stsp 		if (delta_buf == NULL) {
1716 ab2f42e7 2019-11-10 stsp 			cached = 0;
1717 2d9e6abf 2022-05-04 stsp 			err = read_delta_data(&delta_buf, &delta_len, NULL,
1718 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, pack);
1719 ab2f42e7 2019-11-10 stsp 			if (err)
1720 ab2f42e7 2019-11-10 stsp 				goto done;
1721 aabb25f8 2022-10-17 stsp 		}
1722 aabb25f8 2022-10-17 stsp 		if (pack->delta_cache && !cached) {
1723 ab2f42e7 2019-11-10 stsp 			err = got_delta_cache_add(pack->delta_cache,
1724 ab2f42e7 2019-11-10 stsp 			    delta->data_offset, delta_buf, delta_len);
1725 ab2f42e7 2019-11-10 stsp 			if (err == NULL)
1726 ab2f42e7 2019-11-10 stsp 				cached = 1;
1727 ab2f42e7 2019-11-10 stsp 			else if (err->code != GOT_ERR_NO_SPACE) {
1728 ab2f42e7 2019-11-10 stsp 				free(delta_buf);
1729 ab2f42e7 2019-11-10 stsp 				goto done;
1730 ab2f42e7 2019-11-10 stsp 			}
1731 ab2f42e7 2019-11-10 stsp 		}
1732 f18c433a 2022-05-31 stsp 
1733 f18c433a 2022-05-31 stsp 		err = got_delta_get_sizes(&base_size, &result_size,
1734 f18c433a 2022-05-31 stsp 		    delta_buf, delta_len);
1735 e62fc520 2022-11-08 stsp 		if (err) {
1736 e62fc520 2022-11-08 stsp 			if (!cached)
1737 e62fc520 2022-11-08 stsp 				free(delta_buf);
1738 f18c433a 2022-05-31 stsp 			goto done;
1739 e62fc520 2022-11-08 stsp 		}
1740 f18c433a 2022-05-31 stsp 		if (base_size > max_size)
1741 f18c433a 2022-05-31 stsp 			max_size = base_size;
1742 f18c433a 2022-05-31 stsp 		if (result_size > max_size)
1743 f18c433a 2022-05-31 stsp 			max_size = result_size;
1744 f18c433a 2022-05-31 stsp 
1745 f18c433a 2022-05-31 stsp 		if (max_size > base_bufsz) {
1746 f18c433a 2022-05-31 stsp 			uint8_t *p = realloc(base_buf, max_size);
1747 f18c433a 2022-05-31 stsp 			if (p == NULL) {
1748 f18c433a 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1749 e62fc520 2022-11-08 stsp 				if (!cached)
1750 e62fc520 2022-11-08 stsp 					free(delta_buf);
1751 f18c433a 2022-05-31 stsp 				goto done;
1752 f18c433a 2022-05-31 stsp 			}
1753 f18c433a 2022-05-31 stsp 			base_buf = p;
1754 f18c433a 2022-05-31 stsp 			base_bufsz = max_size;
1755 f18c433a 2022-05-31 stsp 		}
1756 f18c433a 2022-05-31 stsp 
1757 f18c433a 2022-05-31 stsp 		if (max_size > accum_bufsz) {
1758 f18c433a 2022-05-31 stsp 			uint8_t *p = realloc(accum_buf, max_size);
1759 f18c433a 2022-05-31 stsp 			if (p == NULL) {
1760 f18c433a 2022-05-31 stsp 				err = got_error_from_errno("realloc");
1761 e62fc520 2022-11-08 stsp 				if (!cached)
1762 e62fc520 2022-11-08 stsp 					free(delta_buf);
1763 f18c433a 2022-05-31 stsp 				goto done;
1764 f18c433a 2022-05-31 stsp 			}
1765 f18c433a 2022-05-31 stsp 			accum_buf = p;
1766 f18c433a 2022-05-31 stsp 			accum_bufsz = max_size;
1767 f18c433a 2022-05-31 stsp 		}
1768 f18c433a 2022-05-31 stsp 
1769 34fca9c3 2018-11-11 stsp 		err = got_delta_apply_in_mem(base_buf, base_bufsz,
1770 42c69117 2019-11-10 stsp 		    delta_buf, delta_len, accum_buf,
1771 34fca9c3 2018-11-11 stsp 		    &accum_size, max_size);
1772 ab2f42e7 2019-11-10 stsp 		if (!cached)
1773 ab2f42e7 2019-11-10 stsp 			free(delta_buf);
1774 e0ab43e7 2018-03-16 stsp 		n++;
1775 e0ab43e7 2018-03-16 stsp 		if (err)
1776 e0ab43e7 2018-03-16 stsp 			goto done;
1777 e0ab43e7 2018-03-16 stsp 
1778 e0ab43e7 2018-03-16 stsp 		if (n < deltas->nentries) {
1779 e0ab43e7 2018-03-16 stsp 			/* Accumulated delta becomes the new base. */
1780 e0ab43e7 2018-03-16 stsp 			uint8_t *tmp = accum_buf;
1781 f18c433a 2022-05-31 stsp 			size_t tmp_size = accum_bufsz;
1782 e0ab43e7 2018-03-16 stsp 			accum_buf = base_buf;
1783 f18c433a 2022-05-31 stsp 			accum_bufsz = base_bufsz;
1784 e0ab43e7 2018-03-16 stsp 			base_buf = tmp;
1785 f18c433a 2022-05-31 stsp 			base_bufsz = tmp_size;
1786 e0ab43e7 2018-03-16 stsp 		}
1787 e0ab43e7 2018-03-16 stsp 	}
1788 e0ab43e7 2018-03-16 stsp 
1789 e0ab43e7 2018-03-16 stsp done:
1790 e0ab43e7 2018-03-16 stsp 	free(base_buf);
1791 e0ab43e7 2018-03-16 stsp 	if (err) {
1792 e0ab43e7 2018-03-16 stsp 		free(accum_buf);
1793 e0ab43e7 2018-03-16 stsp 		*outbuf = NULL;
1794 e0ab43e7 2018-03-16 stsp 		*outlen = 0;
1795 e0ab43e7 2018-03-16 stsp 	} else {
1796 e0ab43e7 2018-03-16 stsp 		*outbuf = accum_buf;
1797 e0ab43e7 2018-03-16 stsp 		*outlen = accum_size;
1798 e0ab43e7 2018-03-16 stsp 	}
1799 efd2a263 2018-01-19 stsp 	return err;
1800 efd2a263 2018-01-19 stsp }
1801 efd2a263 2018-01-19 stsp 
1802 3ee5fc21 2018-01-17 stsp const struct got_error *
1803 24140570 2018-09-09 stsp got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
1804 3840f4c9 2018-09-12 stsp     FILE *outfile, FILE *base_file, FILE *accum_file)
1805 3ee5fc21 2018-01-17 stsp {
1806 3ee5fc21 2018-01-17 stsp 	const struct got_error *err = NULL;
1807 3ee5fc21 2018-01-17 stsp 
1808 3ee5fc21 2018-01-17 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1809 3ee5fc21 2018-01-17 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1810 2ce68b2f 2018-09-09 stsp 
1811 ef2bccd9 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1812 24140570 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1813 24140570 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1814 72eb3431 2018-04-01 stsp 
1815 d7464085 2018-07-09 stsp 		if (pack->map) {
1816 ad4cc361 2022-10-27 op 			size_t mapoff;
1817 ad4cc361 2022-10-27 op 
1818 ad4cc361 2022-10-27 op 			if (obj->pack_offset > SIZE_MAX) {
1819 ad4cc361 2022-10-27 op 				return got_error_fmt(GOT_ERR_RANGE,
1820 ad4cc361 2022-10-27 op 				    "pack offset %lld would overflow size_t",
1821 ad4cc361 2022-10-27 op 				    (long long)obj->pack_offset);
1822 ad4cc361 2022-10-27 op 			}
1823 ad4cc361 2022-10-27 op 
1824 ad4cc361 2022-10-27 op 			mapoff = obj->pack_offset;
1825 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_mmap(&obj->size, NULL, NULL,
1826 4788f1ce 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff,
1827 4788f1ce 2020-03-18 stsp 			    outfile);
1828 d7464085 2018-07-09 stsp 		} else {
1829 24140570 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1830 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1831 4788f1ce 2020-03-18 stsp 			err = got_inflate_to_file_fd(&obj->size, NULL, NULL,
1832 4788f1ce 2020-03-18 stsp 			    pack->fd, outfile);
1833 d7464085 2018-07-09 stsp 		}
1834 040bf4a1 2018-04-01 stsp 	} else
1835 4788f1ce 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_file(&obj->size,
1836 4788f1ce 2020-03-18 stsp 		    &obj->deltas, pack, outfile, base_file, accum_file);
1837 24140570 2018-09-09 stsp 
1838 a1fd68d8 2018-01-12 stsp 	return err;
1839 a1fd68d8 2018-01-12 stsp }
1840 e0ab43e7 2018-03-16 stsp 
1841 e0ab43e7 2018-03-16 stsp const struct got_error *
1842 e0ab43e7 2018-03-16 stsp got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
1843 7e212e3d 2018-09-09 stsp     struct got_object *obj, struct got_pack *pack)
1844 e0ab43e7 2018-03-16 stsp {
1845 e0ab43e7 2018-03-16 stsp 	const struct got_error *err = NULL;
1846 e0ab43e7 2018-03-16 stsp 
1847 e0ab43e7 2018-03-16 stsp 	if ((obj->flags & GOT_OBJ_FLAG_PACKED) == 0)
1848 e0ab43e7 2018-03-16 stsp 		return got_error(GOT_ERR_OBJ_NOT_PACKED);
1849 72eb3431 2018-04-01 stsp 
1850 48095039 2018-09-09 stsp 	if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED) == 0) {
1851 7e212e3d 2018-09-09 stsp 		if (obj->pack_offset >= pack->filesize)
1852 7e212e3d 2018-09-09 stsp 			return got_error(GOT_ERR_PACK_OFFSET);
1853 d7464085 2018-07-09 stsp 		if (pack->map) {
1854 ad4cc361 2022-10-27 op 			size_t mapoff;
1855 ad4cc361 2022-10-27 op 
1856 ad4cc361 2022-10-27 op 			if (obj->pack_offset > SIZE_MAX) {
1857 ad4cc361 2022-10-27 op 				return got_error_fmt(GOT_ERR_RANGE,
1858 ad4cc361 2022-10-27 op 				    "pack offset %lld would overflow size_t",
1859 ad4cc361 2022-10-27 op 				    (long long)obj->pack_offset);
1860 ad4cc361 2022-10-27 op 			}
1861 ad4cc361 2022-10-27 op 
1862 ad4cc361 2022-10-27 op 			mapoff = obj->pack_offset;
1863 2e5a6fad 2020-03-18 stsp 			err = got_inflate_to_mem_mmap(buf, len, NULL, NULL,
1864 2e5a6fad 2020-03-18 stsp 			    pack->map, mapoff, pack->filesize - mapoff);
1865 d7464085 2018-07-09 stsp 		} else {
1866 7e212e3d 2018-09-09 stsp 			if (lseek(pack->fd, obj->pack_offset, SEEK_SET) == -1)
1867 638f9024 2019-05-13 stsp 				return got_error_from_errno("lseek");
1868 1e87a3c3 2020-03-18 stsp 			err = got_inflate_to_mem_fd(buf, len, NULL, NULL,
1869 55fdd257 2020-03-18 stsp 			    obj->size, pack->fd);
1870 e0ab43e7 2018-03-16 stsp 		}
1871 e0ab43e7 2018-03-16 stsp 	} else
1872 668a20f6 2020-03-18 stsp 		err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
1873 668a20f6 2020-03-18 stsp 		    pack);
1874 7e212e3d 2018-09-09 stsp 
1875 e0ab43e7 2018-03-16 stsp 	return err;
1876 e0ab43e7 2018-03-16 stsp }
1877 67fd6849 2022-02-13 stsp 
1878 2d9e6abf 2022-05-04 stsp static const struct got_error *
1879 2d9e6abf 2022-05-04 stsp read_raw_delta_data(uint8_t **delta_buf, size_t *delta_len,
1880 2d9e6abf 2022-05-04 stsp     size_t *delta_len_compressed, uint64_t *base_size, uint64_t *result_size,
1881 2d9e6abf 2022-05-04 stsp     off_t delta_data_offset, struct got_pack *pack, struct got_packidx *packidx)
1882 2d9e6abf 2022-05-04 stsp {
1883 2d9e6abf 2022-05-04 stsp 	const struct got_error *err = NULL;
1884 2d9e6abf 2022-05-04 stsp 
1885 2d9e6abf 2022-05-04 stsp 	/* Validate decompression and obtain the decompressed size. */
1886 2d9e6abf 2022-05-04 stsp 	err = read_delta_data(delta_buf, delta_len, delta_len_compressed,
1887 2d9e6abf 2022-05-04 stsp 	    delta_data_offset, pack);
1888 2d9e6abf 2022-05-04 stsp 	if (err)
1889 2d9e6abf 2022-05-04 stsp 		return err;
1890 2d9e6abf 2022-05-04 stsp 
1891 2d9e6abf 2022-05-04 stsp 	/* Read delta base/result sizes from head of delta stream. */
1892 2d9e6abf 2022-05-04 stsp 	err = got_delta_get_sizes(base_size, result_size,
1893 2d9e6abf 2022-05-04 stsp 	    *delta_buf, *delta_len);
1894 2d9e6abf 2022-05-04 stsp 	if (err)
1895 2d9e6abf 2022-05-04 stsp 		goto done;
1896 2d9e6abf 2022-05-04 stsp 
1897 2d9e6abf 2022-05-04 stsp 	/* Discard decompressed delta and read it again in compressed form. */
1898 2d9e6abf 2022-05-04 stsp 	free(*delta_buf);
1899 2d9e6abf 2022-05-04 stsp 	*delta_buf = malloc(*delta_len_compressed);
1900 2d9e6abf 2022-05-04 stsp 	if (*delta_buf == NULL) {
1901 2d9e6abf 2022-05-04 stsp 		err = got_error_from_errno("malloc");
1902 2d9e6abf 2022-05-04 stsp 		goto done;
1903 2d9e6abf 2022-05-04 stsp 	}
1904 2d9e6abf 2022-05-04 stsp 	if (pack->map) {
1905 82031ac8 2022-10-24 op 		if (delta_data_offset >= pack->filesize) {
1906 2d9e6abf 2022-05-04 stsp 			err = got_error(GOT_ERR_PACK_OFFSET);
1907 82031ac8 2022-10-24 op 			goto done;
1908 82031ac8 2022-10-24 op 		}
1909 2d9e6abf 2022-05-04 stsp 		memcpy(*delta_buf, pack->map + delta_data_offset,
1910 2d9e6abf 2022-05-04 stsp 		    *delta_len_compressed);
1911 2d9e6abf 2022-05-04 stsp 	} else {
1912 2d9e6abf 2022-05-04 stsp 		ssize_t n;
1913 2d9e6abf 2022-05-04 stsp 		if (lseek(pack->fd, delta_data_offset, SEEK_SET) == -1) {
1914 2d9e6abf 2022-05-04 stsp 			err = got_error_from_errno("lseek");
1915 2d9e6abf 2022-05-04 stsp 			goto done;
1916 2d9e6abf 2022-05-04 stsp 		}
1917 2d9e6abf 2022-05-04 stsp 		n = read(pack->fd, *delta_buf, *delta_len_compressed);
1918 2d9e6abf 2022-05-04 stsp 		if (n < 0) {
1919 2d9e6abf 2022-05-04 stsp 			err = got_error_from_errno("read");
1920 2d9e6abf 2022-05-04 stsp 			goto done;
1921 2d9e6abf 2022-05-04 stsp 		} else if (n != *delta_len_compressed) {
1922 2d9e6abf 2022-05-04 stsp 			err = got_error(GOT_ERR_IO);
1923 2d9e6abf 2022-05-04 stsp 			goto done;
1924 2d9e6abf 2022-05-04 stsp 		}
1925 2d9e6abf 2022-05-04 stsp 	}
1926 2d9e6abf 2022-05-04 stsp done:
1927 2d9e6abf 2022-05-04 stsp 	if (err) {
1928 2d9e6abf 2022-05-04 stsp 		free(*delta_buf);
1929 2d9e6abf 2022-05-04 stsp 		*delta_buf = NULL;
1930 2d9e6abf 2022-05-04 stsp 		*delta_len = 0;
1931 2d9e6abf 2022-05-04 stsp 		*delta_len_compressed = 0;
1932 2d9e6abf 2022-05-04 stsp 		*base_size = 0;
1933 2d9e6abf 2022-05-04 stsp 		*result_size = 0;
1934 2d9e6abf 2022-05-04 stsp 	}
1935 2d9e6abf 2022-05-04 stsp 	return err;
1936 2d9e6abf 2022-05-04 stsp }
1937 2d9e6abf 2022-05-04 stsp 
1938 67fd6849 2022-02-13 stsp const struct got_error *
1939 67fd6849 2022-02-13 stsp got_packfile_extract_raw_delta(uint8_t **delta_buf, size_t *delta_size,
1940 24b7de1c 2022-12-03 stsp     size_t *delta_compressed_size, off_t *delta_offset,
1941 24b7de1c 2022-12-03 stsp     off_t *delta_data_offset, off_t *base_offset,
1942 2d9e6abf 2022-05-04 stsp     struct got_object_id *base_id, uint64_t *base_size, uint64_t *result_size,
1943 2d9e6abf 2022-05-04 stsp     struct got_pack *pack, struct got_packidx *packidx, int idx)
1944 67fd6849 2022-02-13 stsp {
1945 67fd6849 2022-02-13 stsp 	const struct got_error *err = NULL;
1946 67fd6849 2022-02-13 stsp 	off_t offset;
1947 67fd6849 2022-02-13 stsp 	uint8_t type;
1948 67fd6849 2022-02-13 stsp 	uint64_t size;
1949 67fd6849 2022-02-13 stsp 	size_t tslen, delta_hdrlen;
1950 67fd6849 2022-02-13 stsp 
1951 67fd6849 2022-02-13 stsp 	*delta_buf = NULL;
1952 67fd6849 2022-02-13 stsp 	*delta_size = 0;
1953 2d9e6abf 2022-05-04 stsp 	*delta_compressed_size = 0;
1954 67fd6849 2022-02-13 stsp 	*delta_offset = 0;
1955 24b7de1c 2022-12-03 stsp 	*delta_data_offset = 0;
1956 67fd6849 2022-02-13 stsp 	*base_offset = 0;
1957 67fd6849 2022-02-13 stsp 	*base_size = 0;
1958 67fd6849 2022-02-13 stsp 	*result_size = 0;
1959 67fd6849 2022-02-13 stsp 
1960 67fd6849 2022-02-13 stsp 	offset = got_packidx_get_object_offset(packidx, idx);
1961 04aed155 2022-07-24 naddy 	if (offset == -1)
1962 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_PACKIDX);
1963 67fd6849 2022-02-13 stsp 
1964 67fd6849 2022-02-13 stsp 	if (offset >= pack->filesize)
1965 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1966 67fd6849 2022-02-13 stsp 
1967 67fd6849 2022-02-13 stsp 	err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
1968 67fd6849 2022-02-13 stsp 	    pack, offset);
1969 67fd6849 2022-02-13 stsp 	if (err)
1970 67fd6849 2022-02-13 stsp 		return err;
1971 67fd6849 2022-02-13 stsp 
1972 67fd6849 2022-02-13 stsp 	if (tslen + size < tslen || offset + size < size ||
1973 67fd6849 2022-02-13 stsp 	    tslen + offset < tslen)
1974 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_PACK_OFFSET);
1975 67fd6849 2022-02-13 stsp 
1976 67fd6849 2022-02-13 stsp 	switch (type) {
1977 67fd6849 2022-02-13 stsp 	case GOT_OBJ_TYPE_OFFSET_DELTA:
1978 67fd6849 2022-02-13 stsp 		err = got_pack_parse_offset_delta(base_offset, &delta_hdrlen,
1979 67fd6849 2022-02-13 stsp 		    pack, offset, tslen);
1980 67fd6849 2022-02-13 stsp 		if (err)
1981 67fd6849 2022-02-13 stsp 			return err;
1982 67fd6849 2022-02-13 stsp 		break;
1983 67fd6849 2022-02-13 stsp 	case GOT_OBJ_TYPE_REF_DELTA:
1984 67fd6849 2022-02-13 stsp 		err = got_pack_parse_ref_delta(base_id, pack, offset, tslen);
1985 67fd6849 2022-02-13 stsp 		if (err)
1986 67fd6849 2022-02-13 stsp 			return err;
1987 67fd6849 2022-02-13 stsp 		delta_hdrlen = SHA1_DIGEST_LENGTH;
1988 67fd6849 2022-02-13 stsp 		break;
1989 67fd6849 2022-02-13 stsp 	default:
1990 67fd6849 2022-02-13 stsp 		return got_error_fmt(GOT_ERR_OBJ_TYPE,
1991 04aed155 2022-07-24 naddy 		    "non-delta object type %d found at offset %lld",
1992 04aed155 2022-07-24 naddy 		    type, (long long)offset);
1993 67fd6849 2022-02-13 stsp 	}
1994 67fd6849 2022-02-13 stsp 
1995 67fd6849 2022-02-13 stsp 	if (tslen + delta_hdrlen < delta_hdrlen ||
1996 67fd6849 2022-02-13 stsp 	    offset + delta_hdrlen < delta_hdrlen)
1997 67fd6849 2022-02-13 stsp 		return got_error(GOT_ERR_BAD_DELTA);
1998 67fd6849 2022-02-13 stsp 
1999 24b7de1c 2022-12-03 stsp 	*delta_data_offset = offset + tslen + delta_hdrlen;
2000 2d9e6abf 2022-05-04 stsp 	err = read_raw_delta_data(delta_buf, delta_size, delta_compressed_size,
2001 24b7de1c 2022-12-03 stsp 	    base_size, result_size, *delta_data_offset, pack, packidx);
2002 67fd6849 2022-02-13 stsp 	if (err)
2003 67fd6849 2022-02-13 stsp 		return err;
2004 67fd6849 2022-02-13 stsp 
2005 67fd6849 2022-02-13 stsp 	if (*delta_size != size) {
2006 67fd6849 2022-02-13 stsp 		err = got_error(GOT_ERR_BAD_DELTA);
2007 67fd6849 2022-02-13 stsp 		goto done;
2008 67fd6849 2022-02-13 stsp 	}
2009 67fd6849 2022-02-13 stsp 
2010 67fd6849 2022-02-13 stsp 	*delta_offset = offset;
2011 67fd6849 2022-02-13 stsp done:
2012 67fd6849 2022-02-13 stsp 	if (err) {
2013 67fd6849 2022-02-13 stsp 		free(*delta_buf);
2014 67fd6849 2022-02-13 stsp 		*delta_buf = NULL;
2015 2d9e6abf 2022-05-04 stsp 		*delta_size = 0;
2016 2d9e6abf 2022-05-04 stsp 		*delta_compressed_size = 0;
2017 2d9e6abf 2022-05-04 stsp 		*delta_offset = 0;
2018 2d9e6abf 2022-05-04 stsp 		*base_offset = 0;
2019 2d9e6abf 2022-05-04 stsp 		*base_size = 0;
2020 2d9e6abf 2022-05-04 stsp 		*result_size = 0;
2021 67fd6849 2022-02-13 stsp 	}
2022 67fd6849 2022-02-13 stsp 	return err;
2023 67fd6849 2022-02-13 stsp }