/home/ben/Projects/got/got/../lib/pack.c

Bug Summary

File:	got/../lib/pack.c
Warning:	line 866, column 9 6th function call argument is an uninitialized value
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd6.9 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name pack.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/local/lib/clang/11.1.0 -I /home/ben/Projects/got/got/../include -I /home/ben/Projects/got/got/../lib -D GOT_LIBEXECDIR=/home/ben/bin -D GOT_VERSION=0.53-current -internal-isystem /usr/local/lib/clang/11.1.0/include -internal-externc-isystem /usr/include -O0 -fdebug-compilation-dir /home/ben/Projects/got/got/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /home/ben/Projects/got/scan/2021-05-28-230913-68537-1 -x c /home/ben/Projects/got/got/../lib/pack.c
1/*
* Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

17#include <sys/types.h>
18#include <sys/stat.h>
19#include <sys/queue.h>
20#include <sys/uio.h>
21#include <sys/mman.h>

23#include <fcntl.h>
24#include <errno(*__errno()).h>
25#include <stdio.h>
26#include <stdint.h>
27#include <stdlib.h>
28#include <string.h>
29#include <limits.h>
30#include <sha1.h>
31#include <endian.h>
32#include <unistd.h>
33#include <zlib.h>
34#include <imsg.h>

36#include "got_error.h"
37#include "got_object.h"
38#include "got_opentemp.h"
39#include "got_path.h"

41#include "got_lib_sha1.h"
42#include "got_lib_delta.h"
43#include "got_lib_delta_cache.h"
44#include "got_lib_inflate.h"
45#include "got_lib_object.h"
46#include "got_lib_object_parse.h"
47#include "got_lib_privsep.h"
48#include "got_lib_pack.h"

50#ifndef nitems
51#define nitems(_a)(sizeof(_a) / sizeof((_a)[0])) (sizeof(_a) / sizeof((_a)[0]))
52#endif

54#ifndef MIN
55#define	MIN(_a,_b)((_a) < (_b) ? (_a) : (_b)) ((_a) < (_b) ? (_a) : (_b))
56#endif

58static const struct got_error *
59verify_fanout_table(uint32_t *fanout_table)
60{
int i;

for (i = 0; i < 0xff - 1; i++) {
if (be32toh(fanout_table[i])(__uint32_t)(__builtin_constant_p(fanout_table[i]) ? (__uint32_t
)(((__uint32_t)(fanout_table[i]) & 0xff) << 24 | ((
__uint32_t)(fanout_table[i]) & 0xff00) << 8 | ((__uint32_t
)(fanout_table[i]) & 0xff0000) >> 8 | ((__uint32_t)
(fanout_table[i]) & 0xff000000) >> 24) : __swap32md
(fanout_table[i])) > be32toh(fanout_table[i + 1])(__uint32_t)(__builtin_constant_p(fanout_table[i + 1]) ? (__uint32_t
)(((__uint32_t)(fanout_table[i + 1]) & 0xff) << 24 |
 ((__uint32_t)(fanout_table[i + 1]) & 0xff00) << 8 |
 ((__uint32_t)(fanout_table[i + 1]) & 0xff0000) >> 8
 | ((__uint32_t)(fanout_table[i + 1]) & 0xff000000) >>
 24) : __swap32md(fanout_table[i + 1])))
	return got_error(GOT_ERR_BAD_PACKIDX14);
}

return NULL((void *)0);
69}

71const struct got_error *
72got_packidx_init_hdr(struct got_packidx *p, int verify)
73{
const struct got_error *err = NULL((void *)0);
struct got_packidx_v2_hdr *h;
SHA1_CTX ctx;
uint8_t sha1[SHA1_DIGEST_LENGTH20];
size_t nobj, len_fanout, len_ids, offset, remain;
ssize_t n;
int i;

SHA1Init(&ctx);

h = &p->hdr;
offset = 0;
remain = p->len;

if (remain < sizeof(*h->magic)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->magic = (uint32_t *)(p->map + offset);
else {
h->magic = malloc(sizeof(*h->magic));
if (h->magic == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->magic, sizeof(*h->magic));
if (n < 0) {
	err = got_error_from_errno("read");
	goto done;
} else if (n != sizeof(*h->magic)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (*h->magic != htobe32(GOT_PACKIDX_V2_MAGIC)(__uint32_t)(__builtin_constant_p(0xff744f63) ? (__uint32_t)(
((__uint32_t)(0xff744f63) & 0xff) << 24 | ((__uint32_t
)(0xff744f63) & 0xff00) << 8 | ((__uint32_t)(0xff744f63
) & 0xff0000) >> 8 | ((__uint32_t)(0xff744f63) &
 0xff000000) >> 24) : __swap32md(0xff744f63))) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
offset += sizeof(*h->magic);
remain -= sizeof(*h->magic);

if (verify)
SHA1Update(&ctx, (uint8_t *)h->magic, sizeof(*h->magic));

if (remain < sizeof(*h->version)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->version = (uint32_t *)(p->map + offset);
else {
h->version = malloc(sizeof(*h->version));
if (h->version == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->version, sizeof(*h->version));
if (n < 0) {
	err = got_error_from_errno("read");
	goto done;
} else if (n != sizeof(*h->version)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (*h->version != htobe32(GOT_PACKIDX_VERSION)(__uint32_t)(__builtin_constant_p(2) ? (__uint32_t)(((__uint32_t
)(2) & 0xff) << 24 | ((__uint32_t)(2) & 0xff00)
 << 8 | ((__uint32_t)(2) & 0xff0000) >> 8 | (
(__uint32_t)(2) & 0xff000000) >> 24) : __swap32md(2
))) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
offset += sizeof(*h->version);
remain -= sizeof(*h->version);

if (verify)
SHA1Update(&ctx, (uint8_t *)h->version, sizeof(*h->version));

len_fanout =
   sizeof(*h->fanout_table) * GOT_PACKIDX_V2_FANOUT_TABLE_ITEMS(0xff + 1);
if (remain < len_fanout) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->fanout_table = (uint32_t *)(p->map + offset);
else {
h->fanout_table = malloc(len_fanout);
if (h->fanout_table == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->fanout_table, len_fanout);
if (n < 0) {
	err = got_error_from_errno("read");
	goto done;
} else if (n != len_fanout) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
err = verify_fanout_table(h->fanout_table);
if (err)
goto done;
if (verify)
SHA1Update(&ctx, (uint8_t *)h->fanout_table, len_fanout);
offset += len_fanout;
remain -= len_fanout;

nobj = be32toh(h->fanout_table[0xff])(__uint32_t)(__builtin_constant_p(h->fanout_table[0xff]) ?
 (__uint32_t)(((__uint32_t)(h->fanout_table[0xff]) & 0xff
) << 24 | ((__uint32_t)(h->fanout_table[0xff]) &
 0xff00) << 8 | ((__uint32_t)(h->fanout_table[0xff])
 & 0xff0000) >> 8 | ((__uint32_t)(h->fanout_table
[0xff]) & 0xff000000) >> 24) : __swap32md(h->fanout_table
[0xff]));
len_ids = nobj * sizeof(*h->sorted_ids);
if (len_ids <= nobj || len_ids > remain) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->sorted_ids =
    (struct got_packidx_object_id *)((uint8_t*)(p->map + offset));
else {
h->sorted_ids = malloc(len_ids);
if (h->sorted_ids == NULL((void *)0)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
n = read(p->fd, h->sorted_ids, len_ids);
if (n < 0)
	err = got_error_from_errno("read");
else if (n != len_ids) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (verify)
SHA1Update(&ctx, (uint8_t *)h->sorted_ids, len_ids);
offset += len_ids;
remain -= len_ids;

if (remain < nobj * sizeof(*h->crc32)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->crc32 = (uint32_t *)((uint8_t*)(p->map + offset));
else {
h->crc32 = malloc(nobj * sizeof(*h->crc32));
if (h->crc32 == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->crc32, nobj * sizeof(*h->crc32));
if (n < 0)
	err = got_error_from_errno("read");
else if (n != nobj * sizeof(*h->crc32)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (verify)
SHA1Update(&ctx, (uint8_t *)h->crc32, nobj * sizeof(*h->crc32));
remain -= nobj * sizeof(*h->crc32);
offset += nobj * sizeof(*h->crc32);

if (remain < nobj * sizeof(*h->offsets)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->offsets = (uint32_t *)((uint8_t*)(p->map + offset));
else {
h->offsets = malloc(nobj * sizeof(*h->offsets));
if (h->offsets == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->offsets, nobj * sizeof(*h->offsets));
if (n < 0)
	err = got_error_from_errno("read");
else if (n != nobj * sizeof(*h->offsets)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (verify)
SHA1Update(&ctx, (uint8_t *)h->offsets,
    nobj * sizeof(*h->offsets));
remain -= nobj * sizeof(*h->offsets);
offset += nobj * sizeof(*h->offsets);

/* Large file offsets are contained only in files > 2GB. */
for (i = 0; i < nobj; i++) {
uint32_t o = h->offsets[i];
if (o & htobe32(GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX)(__uint32_t)(__builtin_constant_p(0x80000000) ? (__uint32_t)(
((__uint32_t)(0x80000000) & 0xff) << 24 | ((__uint32_t
)(0x80000000) & 0xff00) << 8 | ((__uint32_t)(0x80000000
) & 0xff0000) >> 8 | ((__uint32_t)(0x80000000) &
 0xff000000) >> 24) : __swap32md(0x80000000)))
	p->nlargeobj++;
}
if (p->nlargeobj == 0)
goto checksum;

if (remain < p->nlargeobj * sizeof(*h->large_offsets)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->large_offsets = (uint64_t *)((uint8_t*)(p->map + offset));
else {
h->large_offsets = malloc(p->nlargeobj *
    sizeof(*h->large_offsets));
if (h->large_offsets == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->large_offsets,
    p->nlargeobj * sizeof(*h->large_offsets));
if (n < 0)
	err = got_error_from_errno("read");
else if (n != p->nlargeobj * sizeof(*h->large_offsets)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (verify)
SHA1Update(&ctx, (uint8_t*)h->large_offsets,
    p->nlargeobj * sizeof(*h->large_offsets));
remain -= p->nlargeobj * sizeof(*h->large_offsets);
offset += p->nlargeobj * sizeof(*h->large_offsets);

297checksum:
if (remain < sizeof(*h->trailer)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
goto done;
}
if (p->map)
h->trailer =
    (struct got_packidx_trailer *)((uint8_t*)(p->map + offset));
else {
h->trailer = malloc(sizeof(*h->trailer));
if (h->trailer == NULL((void *)0)) {
	err = got_error_from_errno("malloc");
	goto done;
}
n = read(p->fd, h->trailer, sizeof(*h->trailer));
if (n < 0)
	err = got_error_from_errno("read");
else if (n != sizeof(*h->trailer)) {
	err = got_error(GOT_ERR_BAD_PACKIDX14);
	goto done;
}
}
if (verify) {
SHA1Update(&ctx, h->trailer->packfile_sha1, SHA1_DIGEST_LENGTH20);
SHA1Final(sha1, &ctx);
if (memcmp(h->trailer->packidx_sha1, sha1,
    SHA1_DIGEST_LENGTH20) != 0)
	err = got_error(GOT_ERR_PACKIDX_CSUM15);
}
326done:
return err;
328}

330const struct got_error *
331got_packidx_open(struct got_packidx **packidx,
  int dir_fd, const char *relpath, int verify)
333{
const struct got_error *err = NULL((void *)0);
struct got_packidx *p;
struct stat sb;

*packidx = NULL((void *)0);

p = calloc(1, sizeof(*p));
if (p == NULL((void *)0))
return got_error_from_errno("calloc");

p->fd = openat(dir_fd, relpath, O_RDONLY0x0000 | O_NOFOLLOW0x0100);
if (p->fd == -1) {
err = got_error_from_errno2("openat", relpath);
free(p);
return err;
}

if (fstat(p->fd, &sb) != 0) {
err = got_error_from_errno2("fstat", relpath);
close(p->fd);
free(p);
return err;
}
p->len = sb.st_size;
if (p->len < sizeof(p->hdr)) {
err = got_error(GOT_ERR_BAD_PACKIDX14);
close(p->fd);
free(p);
return err;
}

p->path_packidx = strdup(relpath);
if (p->path_packidx == NULL((void *)0)) {
err = got_error_from_errno("strdup");
goto done;
}

371#ifndef GOT_PACK_NO_MMAP
p->map = mmap(NULL((void *)0), p->len, PROT_READ0x01, MAP_PRIVATE0x0002, p->fd, 0);
if (p->map == MAP_FAILED((void *)-1)) {
if (errno(*__errno()) != ENOMEM12) {
	err = got_error_from_errno("mmap");
	goto done;
}
p->map = NULL((void *)0); /* fall back to read(2) */
}
380#endif

err = got_packidx_init_hdr(p, verify);
383done:
if (err)
got_packidx_close(p);
else
*packidx = p;

return err;
390}

392const struct got_error *
393got_packidx_close(struct got_packidx *packidx)
394{
const struct got_error *err = NULL((void *)0);

free(packidx->path_packidx);
if (packidx->map) {
if (munmap(packidx->map, packidx->len) == -1)
	err = got_error_from_errno("munmap");
} else {
free(packidx->hdr.magic);
free(packidx->hdr.version);
free(packidx->hdr.fanout_table);
free(packidx->hdr.sorted_ids);
free(packidx->hdr.crc32);
free(packidx->hdr.offsets);
free(packidx->hdr.large_offsets);
free(packidx->hdr.trailer);
}
if (close(packidx->fd) == -1 && err == NULL((void *)0))
err = got_error_from_errno("close");
free(packidx);

return err;
416}

418const struct got_error *
419got_packidx_get_packfile_path(char **path_packfile, struct got_packidx *packidx)
420{
size_t size;

/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
size = strlen(packidx->path_packidx) + 2;
if (size < GOT_PACKFILE_NAMELEN(strlen("pack-") + (20 * 2 + 1) - 1 + strlen(".pack")) + 1)
return got_error_path(packidx->path_packidx, GOT_ERR_BAD_PATH4);

*path_packfile = malloc(size);
if (*path_packfile == NULL((void *)0))
return got_error_from_errno("malloc");

/* Copy up to and excluding ".idx". */
if (strlcpy(*path_packfile, packidx->path_packidx,
   size - strlen(GOT_PACKIDX_SUFFIX".idx") - 1) >= size)
return got_error(GOT_ERR_NO_SPACE9);

if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX".pack", size) >= size)
return got_error(GOT_ERR_NO_SPACE9);

return NULL((void *)0);
441}

443static off_t
444get_object_offset(struct got_packidx *packidx, int idx)
445{
uint32_t offset = be32toh(packidx->hdr.offsets[idx])(__uint32_t)(__builtin_constant_p(packidx->hdr.offsets[idx
]) ? (__uint32_t)(((__uint32_t)(packidx->hdr.offsets[idx])
 & 0xff) << 24 | ((__uint32_t)(packidx->hdr.offsets
[idx]) & 0xff00) << 8 | ((__uint32_t)(packidx->hdr
.offsets[idx]) & 0xff0000) >> 8 | ((__uint32_t)(packidx
->hdr.offsets[idx]) & 0xff000000) >> 24) : __swap32md
(packidx->hdr.offsets[idx]));
if (offset & GOT_PACKIDX_OFFSET_VAL_IS_LARGE_IDX0x80000000) {
uint64_t loffset;
idx = offset & GOT_PACKIDX_OFFSET_VAL_MASK0x7fffffff;
if (idx < 0 || idx >= packidx->nlargeobj ||
    packidx->hdr.large_offsets == NULL((void *)0))
	return -1;
loffset = be64toh(packidx->hdr.large_offsets[idx])(__uint64_t)(__builtin_constant_p(packidx->hdr.large_offsets
[idx]) ? (__uint64_t)((((__uint64_t)(packidx->hdr.large_offsets
[idx]) & 0xff) << 56) | ((__uint64_t)(packidx->hdr
.large_offsets[idx]) & 0xff00ULL) << 40 | ((__uint64_t
)(packidx->hdr.large_offsets[idx]) & 0xff0000ULL) <<
| ((__uint64_t)(packidx->hdr.large_offsets[idx]) &
 0xff000000ULL) << 8 | ((__uint64_t)(packidx->hdr.large_offsets
[idx]) & 0xff00000000ULL) >> 8 | ((__uint64_t)(packidx
->hdr.large_offsets[idx]) & 0xff0000000000ULL) >>
| ((__uint64_t)(packidx->hdr.large_offsets[idx]) &
 0xff000000000000ULL) >> 40 | ((__uint64_t)(packidx->
hdr.large_offsets[idx]) & 0xff00000000000000ULL) >>
 56) : __swap64md(packidx->hdr.large_offsets[idx]));
return (loffset > INT64_MAX0x7fffffffffffffffLL ? -1 : (off_t)loffset);
}
return (off_t)(offset & GOT_PACKIDX_OFFSET_VAL_MASK0x7fffffff);
457}

459int
460got_packidx_get_object_idx(struct got_packidx *packidx, struct got_object_id *id)
461{
u_int8_t id0 = id->sha1[0];
uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff])(__uint32_t)(__builtin_constant_p(packidx->hdr.fanout_table
[0xff]) ? (__uint32_t)(((__uint32_t)(packidx->hdr.fanout_table
[0xff]) & 0xff) << 24 | ((__uint32_t)(packidx->hdr
.fanout_table[0xff]) & 0xff00) << 8 | ((__uint32_t)
(packidx->hdr.fanout_table[0xff]) & 0xff0000) >>
| ((__uint32_t)(packidx->hdr.fanout_table[0xff]) & 0xff000000
) >> 24) : __swap32md(packidx->hdr.fanout_table[0xff
]));
int left = 0, right = totobj - 1;

if (id0 > 0)
left = be32toh(packidx->hdr.fanout_table[id0 - 1])(__uint32_t)(__builtin_constant_p(packidx->hdr.fanout_table
[id0 - 1]) ? (__uint32_t)(((__uint32_t)(packidx->hdr.fanout_table
[id0 - 1]) & 0xff) << 24 | ((__uint32_t)(packidx->
hdr.fanout_table[id0 - 1]) & 0xff00) << 8 | ((__uint32_t
)(packidx->hdr.fanout_table[id0 - 1]) & 0xff0000) >>
| ((__uint32_t)(packidx->hdr.fanout_table[id0 - 1]) &
 0xff000000) >> 24) : __swap32md(packidx->hdr.fanout_table
[id0 - 1]));

while (left <= right) {
struct got_packidx_object_id *oid;
int i, cmp;

i = ((left + right) / 2);
oid = &packidx->hdr.sorted_ids[i];
cmp = memcmp(id->sha1, oid->sha1, SHA1_DIGEST_LENGTH20);
if (cmp == 0)
	return i;
else if (cmp > 0)
	left = i + 1;
else if (cmp < 0)
	right = i - 1;
}

return -1;
485}

487const struct got_error *
488got_packidx_match_id_str_prefix(struct got_object_id_queue *matched_ids,
  struct got_packidx *packidx, const char *id_str_prefix)
490{
const struct got_error *err = NULL((void *)0);
u_int8_t id0;
uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff])(__uint32_t)(__builtin_constant_p(packidx->hdr.fanout_table
[0xff]) ? (__uint32_t)(((__uint32_t)(packidx->hdr.fanout_table
[0xff]) & 0xff) << 24 | ((__uint32_t)(packidx->hdr
.fanout_table[0xff]) & 0xff00) << 8 | ((__uint32_t)
(packidx->hdr.fanout_table[0xff]) & 0xff0000) >>
| ((__uint32_t)(packidx->hdr.fanout_table[0xff]) & 0xff000000
) >> 24) : __swap32md(packidx->hdr.fanout_table[0xff
]));
char hex[3];
size_t prefix_len = strlen(id_str_prefix);
struct got_packidx_object_id *oid;
uint32_t i;

SIMPLEQ_INIT(matched_ids)do { (matched_ids)->sqh_first = ((void *)0); (matched_ids)
->sqh_last = &(matched_ids)->sqh_first; } while (0);

if (prefix_len < 2)
return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR23);

hex[0] = id_str_prefix[0];
hex[1] = id_str_prefix[1];
hex[2] = '\0';
if (!got_parse_xdigit(&id0, hex))
return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR23);

i = be32toh(packidx->hdr.fanout_table[id0 - 1])(__uint32_t)(__builtin_constant_p(packidx->hdr.fanout_table
[id0 - 1]) ? (__uint32_t)(((__uint32_t)(packidx->hdr.fanout_table
[id0 - 1]) & 0xff) << 24 | ((__uint32_t)(packidx->
hdr.fanout_table[id0 - 1]) & 0xff00) << 8 | ((__uint32_t
)(packidx->hdr.fanout_table[id0 - 1]) & 0xff0000) >>
| ((__uint32_t)(packidx->hdr.fanout_table[id0 - 1]) &
 0xff000000) >> 24) : __swap32md(packidx->hdr.fanout_table
[id0 - 1]));
oid = &packidx->hdr.sorted_ids[i];
while (i < totobj && oid->sha1[0] == id0) {
char id_str[SHA1_DIGEST_STRING_LENGTH(20 * 2 + 1)];
struct got_object_qid *qid;
int cmp;

if (!got_sha1_digest_to_str(oid->sha1, id_str, sizeof(id_str)))
        return got_error(GOT_ERR_NO_SPACE9);

cmp = strncmp(id_str, id_str_prefix, prefix_len);
if (cmp < 0) {
	oid = &packidx->hdr.sorted_ids[++i];
	continue;
} else if (cmp > 0)
	break;

err = got_object_qid_alloc_partial(&qid);
if (err)
	break;
memcpy(qid->id->sha1, oid->sha1, SHA1_DIGEST_LENGTH20);
SIMPLEQ_INSERT_TAIL(matched_ids, qid, entry)do { (qid)->entry.sqe_next = ((void *)0); *(matched_ids)->
sqh_last = (qid); (matched_ids)->sqh_last = &(qid)->
entry.sqe_next; } while (0);

oid = &packidx->hdr.sorted_ids[++i];
}

if (err)
got_object_id_queue_free(matched_ids);
return err;
539}

541const struct got_error *
542got_pack_stop_privsep_child(struct got_pack *pack)
543{
const struct got_error *err = NULL((void *)0);

if (pack->privsep_child == NULL((void *)0))
return NULL((void *)0);

err = got_privsep_send_stop(pack->privsep_child->imsg_fd);
if (err)
return err;
err = got_privsep_wait_for_child(pack->privsep_child->pid);
if (close(pack->privsep_child->imsg_fd) == -1 && err == NULL((void *)0))
err = got_error_from_errno("close");
free(pack->privsep_child);
pack->privsep_child = NULL((void *)0);
return err;
558}

560const struct got_error *
561got_pack_close(struct got_pack *pack)
562{
const struct got_error *err = NULL((void *)0);

err = got_pack_stop_privsep_child(pack);
if (pack->map && munmap(pack->map, pack->filesize) == -1 && !err)
err = got_error_from_errno("munmap");
if (pack->fd != -1 && close(pack->fd) == -1 && err == NULL((void *)0))
err = got_error_from_errno("close");
pack->fd = -1;
free(pack->path_packfile);
pack->path_packfile = NULL((void *)0);
pack->filesize = 0;
if (pack->delta_cache) {
got_delta_cache_free(pack->delta_cache);
pack->delta_cache = NULL((void *)0);
}

return err;
580}

582const struct got_error *
583got_pack_parse_object_type_and_size(uint8_t *type, uint64_t *size, size_t *len,
  struct got_pack *pack, off_t offset)
585{
uint8_t t = 0;
uint64_t s = 0;
uint8_t sizeN;
size_t mapoff = 0;
int i = 0;

*len = 0;

if (offset51.1
'offset' is < field 'filesize'
 >= pack->filesize)
3
←
Assuming 'offset' is < field 'filesize'→
4
←
Taking false branch→
52
←
Taking false branch→
return got_error(GOT_ERR_PACK_OFFSET42);

if (pack->map52.1
Field 'map' is null
) {
5
←
Assuming field 'map' is null→
6
←
Taking false branch→
53
←
Taking false branch→
mapoff = (size_t)offset;
} else {
if (lseek(pack->fd, offset, SEEK_SET0) == -1)
7
←
Assuming the condition is false→
8
←
Taking false branch→
54
←
Assuming the condition is true→
55
←
Taking true branch→
	return got_error_from_errno("lseek");
56
←
Returning without writing to '*type'→
57
←
Returning pointer, which participates in a condition later→
}

do {
16
←
Loop condition is false.  Exiting loop→
/* We do not support size values which don't fit in 64 bit. */
if (i8.1
'i' is <= 9
 > 9)
9
←
Taking false branch→
	return got_error(GOT_ERR_NO_SPACE9);

if (pack->map9.1
Field 'map' is null
) {
10
←
Taking false branch→
	sizeN = *(pack->map + mapoff);
	mapoff += sizeof(sizeN);
} else {
	ssize_t n = read(pack->fd, &sizeN, sizeof(sizeN));
	if (n < 0)
11
←
Assuming 'n' is >= 0→
12
←
Taking false branch→
		return got_error_from_errno("read");
	if (n != sizeof(sizeN))
13
←
Assuming the condition is false→
14
←
Taking false branch→
		return got_error(GOT_ERR_BAD_PACKFILE16);
}
*len += sizeof(sizeN);

if (i14.1
'i' is equal to 0
 == 0) {
15
←
Taking true branch→
	t = (sizeN & GOT_PACK_OBJ_SIZE0_TYPE_MASK0x70) >>
	    GOT_PACK_OBJ_SIZE0_TYPE_MASK_SHIFT4;
	s = (sizeN & GOT_PACK_OBJ_SIZE0_VAL_MASK0x0f);
} else {
	size_t shift = 4 + 7 * (i - 1);
	s |= ((sizeN & GOT_PACK_OBJ_SIZE_VAL_MASK0x7f) << shift);
}
i++;
} while (sizeN & GOT_PACK_OBJ_SIZE_MORE0x80);

*type = t;
*size = s;
return NULL((void *)0);
17
←
Returning without writing to 'pack->map', which participates in a condition later→
635}

637static const struct got_error *
638open_plain_object(struct got_object **obj, struct got_object_id *id,
  uint8_t type, off_t offset, size_t size, int idx)
640{
*obj = calloc(1, sizeof(**obj));
if (*obj == NULL((void *)0))
return got_error_from_errno("calloc");

(*obj)->type = type;
(*obj)->flags = GOT_OBJ_FLAG_PACKED0x01;
(*obj)->pack_idx = idx;
(*obj)->hdrlen = 0;
(*obj)->size = size;
memcpy(&(*obj)->id, id, sizeof((*obj)->id));
(*obj)->pack_offset = offset;

return NULL((void *)0);
654}

656static const struct got_error *
657parse_negative_offset(int64_t *offset, size_t *len, struct got_pack *pack,
  off_t delta_offset)
659{
int64_t o = 0;
uint8_t offN;
int i = 0;

*offset = 0;
*len = 0;

do {
/* We do not support offset values which don't fit in 64 bit. */
if (i > 8)
	return got_error(GOT_ERR_NO_SPACE9);

if (pack->map) {
	size_t mapoff;
	if (delta_offset >= pack->filesize)
		return got_error(GOT_ERR_PACK_OFFSET42);
	mapoff = (size_t)delta_offset + *len;
	offN = *(pack->map + mapoff);
} else {
	ssize_t n;
	n = read(pack->fd, &offN, sizeof(offN));
	if (n < 0)
		return got_error_from_errno("read");
	if (n != sizeof(offN))
		return got_error(GOT_ERR_BAD_PACKFILE16);
}
*len += sizeof(offN);

if (i == 0)
	o = (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK0x7f);
else {
	o++;
	o <<= 7;
	o += (offN & GOT_PACK_OBJ_DELTA_OFF_VAL_MASK0x7f);
}
i++;
} while (offN & GOT_PACK_OBJ_DELTA_OFF_MORE0x80);

*offset = o;
return NULL((void *)0);
700}

702const struct got_error *
703got_pack_parse_offset_delta(off_t *base_offset, size_t *len, struct got_pack *pack,
  off_t offset, int tslen)
705{
const struct got_error *err;
int64_t negoffset;
size_t negofflen;

*len = 0;

err = parse_negative_offset(&negoffset, &negofflen, pack,
   offset + tslen);
if (err)
return err;

/* Compute the base object's offset (must be in the same pack file). */
*base_offset = (offset - negoffset);
if (*base_offset <= 0)
return got_error(GOT_ERR_BAD_PACKFILE16);

*len = negofflen;
return NULL((void *)0);
724}

726static const struct got_error *
727read_delta_data(uint8_t **delta_buf, size_t *delta_len,
  size_t delta_data_offset, struct got_pack *pack)
729{
const struct got_error *err = NULL((void *)0);

if (pack->map) {
if (delta_data_offset >= pack->filesize)
	return got_error(GOT_ERR_PACK_OFFSET42);
err = got_inflate_to_mem_mmap(delta_buf, delta_len,
    NULL((void *)0), NULL((void *)0), pack->map, delta_data_offset,
    pack->filesize - delta_data_offset);
} else {
if (lseek(pack->fd, delta_data_offset, SEEK_SET0) == -1)
	return got_error_from_errno("lseek");
err = got_inflate_to_mem_fd(delta_buf, delta_len, NULL((void *)0),
    NULL((void *)0), 0, pack->fd);
}
return err;
745}

747static const struct got_error *
748add_delta(struct got_delta_chain *deltas, off_t delta_offset, size_t tslen,
  int delta_type, size_t delta_size, size_t delta_data_offset)
750{
struct got_delta *delta;

delta = got_delta_open(delta_offset, tslen, delta_type, delta_size,
   delta_data_offset);
if (delta == NULL((void *)0))
40
←
Assuming 'delta' is equal to NULL→
41
←
Taking true branch→
return got_error_from_errno("got_delta_open");
42
←
Returning pointer, which participates in a condition later→
/* delta is freed in got_object_close() */
deltas->nentries++;
SIMPLEQ_INSERT_HEAD(&deltas->entries, delta, entry)do { if (((delta)->entry.sqe_next = (&deltas->entries
)->sqh_first) == ((void *)0)) (&deltas->entries)->
sqh_last = &(delta)->entry.sqe_next; (&deltas->
entries)->sqh_first = (delta); } while (0);
return NULL((void *)0);
761}

763static const struct got_error *
764resolve_offset_delta(struct got_delta_chain *deltas,
  struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
  size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)

768{
const struct got_error *err;
off_t base_offset;
uint8_t base_type;
uint64_t base_size;
size_t base_tslen;
off_t delta_data_offset;
size_t consumed;

err = got_pack_parse_offset_delta(&base_offset, &consumed, pack,
   delta_offset, tslen);
if (err)
return err;

delta_data_offset = delta_offset + tslen + consumed;
if (delta_data_offset >= pack->filesize)
return got_error(GOT_ERR_PACK_OFFSET42);

if (pack->map == NULL((void *)0)) {
delta_data_offset = lseek(pack->fd, 0, SEEK_CUR1);
if (delta_data_offset == -1)
	return got_error_from_errno("lseek");
}

err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
   delta_data_offset);
if (err)
return err;

/* An offset delta must be in the same packfile. */
if (base_offset >= pack->filesize)
return got_error(GOT_ERR_PACK_OFFSET42);

err = got_pack_parse_object_type_and_size(&base_type, &base_size,
   &base_tslen, pack, base_offset);
if (err)
return err;

return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
   base_tslen, base_type, base_size, recursion - 1);
808}

810static const struct got_error *
811resolve_ref_delta(struct got_delta_chain *deltas, struct got_packidx *packidx,
  struct got_pack *pack, off_t delta_offset, size_t tslen, int delta_type,
  size_t delta_size, unsigned int recursion)
814{
const struct got_error *err;
struct got_object_id id;
int idx;
off_t base_offset;
uint8_t base_type;
29
←
'base_type' declared without an initial value→
uint64_t base_size;
size_t base_tslen;
off_t delta_data_offset;

if (delta_offset + tslen >= pack->filesize)
30
←
Assuming the condition is false→
31
←
Taking false branch→
return got_error(GOT_ERR_PACK_OFFSET42);

if (pack->map31.1
Field 'map' is null
) {
32
←
Taking false branch→
size_t mapoff = delta_offset + tslen;
memcpy(&id, pack->map + mapoff, sizeof(id));
mapoff += sizeof(id);
delta_data_offset = (off_t)mapoff;
} else {
ssize_t n;
n = read(pack->fd, &id, sizeof(id));
if (n < 0)
33
←
Assuming 'n' is >= 0→
34
←
Taking false branch→
	return got_error_from_errno("read");
if (n != sizeof(id))
35
←
Assuming the condition is false→
36
←
Taking false branch→
	return got_error(GOT_ERR_BAD_PACKFILE16);
delta_data_offset = lseek(pack->fd, 0, SEEK_CUR1);
if (delta_data_offset == -1)
37
←
Assuming the condition is false→
38
←
Taking false branch→
	return got_error_from_errno("lseek");
}

err = add_delta(deltas, delta_offset, tslen, delta_type, delta_size,
39
←
Calling 'add_delta'→
43
←
Returning from 'add_delta'→
   delta_data_offset);
if (err)
44
←
Assuming 'err' is null→
45
←
Taking false branch→
return err;

/* Delta base must be in the same pack file. */
idx = got_packidx_get_object_idx(packidx, &id);
if (idx == -1)
46
←
Assuming the condition is false→
47
←
Taking false branch→
return got_error(GOT_ERR_NO_OBJ17);

base_offset = get_object_offset(packidx, idx);
if (base_offset == (uint64_t)-1)
48
←
Taking false branch→
return got_error(GOT_ERR_BAD_PACKIDX14);

if (base_offset >= pack->filesize)
49
←
Assuming 'base_offset' is < field 'filesize'→
50
←
Taking false branch→
return got_error(GOT_ERR_PACK_OFFSET42);

err = got_pack_parse_object_type_and_size(&base_type, &base_size,
51
←
Calling 'got_pack_parse_object_type_and_size'→
58
←
Returning from 'got_pack_parse_object_type_and_size'→
   &base_tslen, pack, base_offset);
if (err)
59
←
Assuming 'err' is null→
60
←
Taking false branch→
return err;

return got_pack_resolve_delta_chain(deltas, packidx, pack, base_offset,
61
←
6th function call argument is an uninitialized value
   base_tslen, base_type, base_size, recursion - 1);
868}

870const struct got_error *
871got_pack_resolve_delta_chain(struct got_delta_chain *deltas,
  struct got_packidx *packidx, struct got_pack *pack, off_t delta_offset,
  size_t tslen, int delta_type, size_t delta_size, unsigned int recursion)
874{
const struct got_error *err = NULL((void *)0);

if (--recursion == 0)
26
←
Taking false branch→
return got_error(GOT_ERR_RECURSION32);

switch (delta_type) {
27
←
Control jumps to 'case 7:'  at line 893→
case GOT_OBJ_TYPE_COMMIT1:
case GOT_OBJ_TYPE_TREE2:
case GOT_OBJ_TYPE_BLOB3:
case GOT_OBJ_TYPE_TAG4:
/* Plain types are the final delta base. Recursion ends. */
err = add_delta(deltas, delta_offset, tslen, delta_type,
    delta_size, 0);
break;
case GOT_OBJ_TYPE_OFFSET_DELTA6:
err = resolve_offset_delta(deltas, packidx, pack,
    delta_offset, tslen, delta_type, delta_size, recursion - 1);
break;
case GOT_OBJ_TYPE_REF_DELTA7:
err = resolve_ref_delta(deltas, packidx, pack,
28
←
Calling 'resolve_ref_delta'→
    delta_offset, tslen, delta_type, delta_size, recursion - 1);
break;
default:
return got_error(GOT_ERR_OBJ_TYPE11);
}

return err;
902}

904static const struct got_error *
905open_delta_object(struct got_object **obj, struct got_packidx *packidx,
  struct got_pack *pack, struct got_object_id *id, off_t offset,
  size_t tslen, int delta_type, size_t delta_size, int idx)
908{
const struct got_error *err = NULL((void *)0);
int resolved_type;

*obj = calloc(1, sizeof(**obj));
if (*obj == NULL((void *)0))
22
←
Assuming the condition is false→
23
←
Taking false branch→
return got_error_from_errno("calloc");

(*obj)->flags = 0;
(*obj)->hdrlen = 0;
(*obj)->size = 0; /* Not known because deltas aren't applied yet. */
memcpy(&(*obj)->id, id, sizeof((*obj)->id));
(*obj)->pack_offset = offset + tslen;

SIMPLEQ_INIT(&(*obj)->deltas.entries)do { (&(*obj)->deltas.entries)->sqh_first = ((void *
)0); (&(*obj)->deltas.entries)->sqh_last = &(&
(*obj)->deltas.entries)->sqh_first; } while (0);
24
←
Loop condition is false.  Exiting loop→
(*obj)->flags |= GOT_OBJ_FLAG_DELTIFIED0x02;
(*obj)->flags |= GOT_OBJ_FLAG_PACKED0x01;
(*obj)->pack_idx = idx;

err = got_pack_resolve_delta_chain(&(*obj)->deltas, packidx, pack,
25
←
Calling 'got_pack_resolve_delta_chain'→
   offset, tslen, delta_type, delta_size,
   GOT_DELTA_CHAIN_RECURSION_MAX500);
if (err)
goto done;

err = got_delta_chain_get_base_type(&resolved_type, &(*obj)->deltas);
if (err)
goto done;
(*obj)->type = resolved_type;
937done:
if (err) {
got_object_close(*obj);
*obj = NULL((void *)0);
}
return err;
943}

945const struct got_error *
946got_packfile_open_object(struct got_object **obj, struct got_pack *pack,
  struct got_packidx *packidx, int idx, struct got_object_id *id)
948{
const struct got_error *err = NULL((void *)0);
off_t offset;
uint8_t type;
uint64_t size;
size_t tslen;

*obj = NULL((void *)0);

offset = get_object_offset(packidx, idx);
if (offset == (uint64_t)-1)
1
Taking false branch→
return got_error(GOT_ERR_BAD_PACKIDX14);

err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
2
←
Calling 'got_pack_parse_object_type_and_size'→
18
←
Returning from 'got_pack_parse_object_type_and_size'→
   pack, offset);
if (err18.1
'err' is null
)
19
←
Taking false branch→
return err;

switch (type) {
20
←
Control jumps to 'case 7:'  at line 975→
case GOT_OBJ_TYPE_COMMIT1:
case GOT_OBJ_TYPE_TREE2:
case GOT_OBJ_TYPE_BLOB3:
case GOT_OBJ_TYPE_TAG4:
err = open_plain_object(obj, id, type, offset + tslen,
    size, idx);
break;
case GOT_OBJ_TYPE_OFFSET_DELTA6:
case GOT_OBJ_TYPE_REF_DELTA7:
err = open_delta_object(obj, packidx, pack, id, offset,
21
←
Calling 'open_delta_object'→
    tslen, type, size, idx);
break;
default:
err = got_error(GOT_ERR_OBJ_TYPE11);
break;
}

return err;
985}

987const struct got_error *
988got_pack_get_delta_chain_max_size(uint64_t *max_size, struct got_delta_chain *deltas,
  struct got_pack *pack)
990{
struct got_delta *delta;
uint64_t base_size = 0, result_size = 0;

*max_size = 0;
SIMPLEQ_FOREACH(delta, &deltas->entries, entry)for((delta) = ((&deltas->entries)->sqh_first); (delta
) != ((void *)0); (delta) = ((delta)->entry.sqe_next)) {
/* Plain object types are the delta base. */
if (delta->type != GOT_OBJ_TYPE_COMMIT1 &&
    delta->type != GOT_OBJ_TYPE_TREE2 &&
    delta->type != GOT_OBJ_TYPE_BLOB3 &&
    delta->type != GOT_OBJ_TYPE_TAG4) {
	const struct got_error *err;
	uint8_t *delta_buf;
	size_t delta_len;
	int cached = 1;

	got_delta_cache_get(&delta_buf, &delta_len,
	    pack->delta_cache, delta->data_offset);
	if (delta_buf == NULL((void *)0)) {
		cached = 0;
		err = read_delta_data(&delta_buf, &delta_len,
		    delta->data_offset, pack);
		if (err)
			return err;
		err = got_delta_cache_add(pack->delta_cache,
		    delta->data_offset, delta_buf, delta_len);
		if (err == NULL((void *)0))
			cached = 1;
		else if (err->code != GOT_ERR_NO_SPACE9) {
			free(delta_buf);
			return err;
		}
	}
	err = got_delta_get_sizes(&base_size, &result_size,
	    delta_buf, delta_len);
	if (!cached)
		free(delta_buf);
	if (err)
		return err;
} else
	base_size = delta->size;
if (base_size > *max_size)
	*max_size = base_size;
if (result_size > *max_size)
	*max_size = result_size;
}

return NULL((void *)0);
1038}

1040const struct got_error *
1041got_pack_get_max_delta_object_size(uint64_t *size, struct got_object *obj,
  struct got_pack *pack)
1043{
if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED0x02) == 0)
return got_error(GOT_ERR_OBJ_TYPE11);

return got_pack_get_delta_chain_max_size(size, &obj->deltas, pack);
1048}

1050const struct got_error *
1051got_pack_dump_delta_chain_to_file(size_t *result_size,
  struct got_delta_chain *deltas, struct got_pack *pack, FILE *outfile,
  FILE *base_file, FILE *accum_file)
1054{
const struct got_error *err = NULL((void *)0);
struct got_delta *delta;
uint8_t *base_buf = NULL((void *)0), *accum_buf = NULL((void *)0), *delta_buf;
size_t base_bufsz = 0, accum_size = 0, delta_len;
uint64_t max_size;
int n = 0;

*result_size = 0;

if (SIMPLEQ_EMPTY(&deltas->entries)(((&deltas->entries)->sqh_first) == ((void *)0)))
return got_error(GOT_ERR_BAD_DELTA_CHAIN20);

/* We process small enough files entirely in memory for speed. */
err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
if (err)
return err;
if (max_size < GOT_DELTA_RESULT_SIZE_CACHED_MAX(8 * 1024 * 1024)) {
accum_buf = malloc(max_size);
if (accum_buf == NULL((void *)0))
	return got_error_from_errno("malloc");
base_file = NULL((void *)0);
accum_file = NULL((void *)0);
}

/* Deltas are ordered in ascending order. */
SIMPLEQ_FOREACH(delta, &deltas->entries, entry)for((delta) = ((&deltas->entries)->sqh_first); (delta
) != ((void *)0); (delta) = ((delta)->entry.sqe_next)) {
int cached = 1;
if (n == 0) {
	size_t mapoff;
	off_t delta_data_offset;

	/* Plain object types are the delta base. */
	if (delta->type != GOT_OBJ_TYPE_COMMIT1 &&
	    delta->type != GOT_OBJ_TYPE_TREE2 &&
	    delta->type != GOT_OBJ_TYPE_BLOB3 &&
	    delta->type != GOT_OBJ_TYPE_TAG4) {
		err = got_error(GOT_ERR_BAD_DELTA_CHAIN20);
		goto done;
	}

	delta_data_offset = delta->offset + delta->tslen;
	if (delta_data_offset >= pack->filesize) {
		err = got_error(GOT_ERR_PACK_OFFSET42);
		goto done;
	}
	if (pack->map == NULL((void *)0)) {
		if (lseek(pack->fd, delta_data_offset, SEEK_SET0)
		    == -1) {
			err = got_error_from_errno("lseek");
			goto done;
		}
	}
	if (base_file) {
		if (pack->map) {
			mapoff = (size_t)delta_data_offset;
			err = got_inflate_to_file_mmap(
			    &base_bufsz, NULL((void *)0), NULL((void *)0), pack->map,
			    mapoff, pack->filesize - mapoff,
			    base_file);
		} else
			err = got_inflate_to_file_fd(
			    &base_bufsz, NULL((void *)0), NULL((void *)0), pack->fd,
			    base_file);
	} else {
		if (pack->map) {
			mapoff = (size_t)delta_data_offset;
			err = got_inflate_to_mem_mmap(&base_buf,
			    &base_bufsz, NULL((void *)0), NULL((void *)0),
			    pack->map, mapoff,
			    pack->filesize - mapoff);
		} else
			err = got_inflate_to_mem_fd(&base_buf,
			    &base_bufsz, NULL((void *)0), NULL((void *)0), max_size,
			    pack->fd);
	}
	if (err)
		goto done;
	n++;
	if (base_file)
		rewind(base_file);
	continue;
}

got_delta_cache_get(&delta_buf, &delta_len,
    pack->delta_cache, delta->data_offset);
if (delta_buf == NULL((void *)0)) {
	cached = 0;
	err = read_delta_data(&delta_buf, &delta_len,
	    delta->data_offset, pack);
	if (err)
		goto done;
	err = got_delta_cache_add(pack->delta_cache,
	    delta->data_offset, delta_buf, delta_len);
	if (err == NULL((void *)0))
		cached = 1;
	else if (err->code != GOT_ERR_NO_SPACE9) {
		free(delta_buf);
		goto done;
	}
}
if (base_buf) {
	err = got_delta_apply_in_mem(base_buf, base_bufsz,
	    delta_buf, delta_len, accum_buf,
	    &accum_size, max_size);
	n++;
} else {
	err = got_delta_apply(base_file, delta_buf,
	    delta_len,
	    /* Final delta application writes to output file. */
	    ++n < deltas->nentries ? accum_file : outfile,
	    &accum_size);
}
if (!cached)
	free(delta_buf);
if (err)
	goto done;

if (n < deltas->nentries) {
	/* Accumulated delta becomes the new base. */
	if (base_buf) {
		uint8_t *tmp = accum_buf;
		/*
		 * Base buffer switches roles with accumulation
		 * buffer. Ensure it can hold the largest
		 * result in the delta chain. The initial
		 * allocation might have been smaller.
		 */
		if (base_bufsz < max_size) {
			uint8_t *p;
			p = reallocarray(base_buf, 1, max_size);
			if (p == NULL((void *)0)) {
				err = got_error_from_errno(
				    "reallocarray");
				goto done;
			}
			base_buf = p;
			base_bufsz = max_size;
		}
		accum_buf = base_buf;
		base_buf = tmp;
	} else {
		FILE *tmp = accum_file;
		accum_file = base_file;
		base_file = tmp;
		rewind(base_file);
		rewind(accum_file);
	}
}
}

1205done:
free(base_buf);
if (accum_buf) {
size_t len = fwrite(accum_buf, 1, accum_size, outfile);
free(accum_buf);
if (len != accum_size)
	err = got_ferror(outfile, GOT_ERR_IO6);
}
rewind(outfile);
if (err == NULL((void *)0))
*result_size = accum_size;
return err;
1217}

1219const struct got_error *
1220got_pack_dump_delta_chain_to_mem(uint8_t **outbuf, size_t *outlen,
  struct got_delta_chain *deltas, struct got_pack *pack)
1222{
const struct got_error *err = NULL((void *)0);
struct got_delta *delta;
uint8_t *base_buf = NULL((void *)0), *accum_buf = NULL((void *)0), *delta_buf;
size_t base_bufsz = 0, accum_size = 0, delta_len;
uint64_t max_size;
int n = 0;

*outbuf = NULL((void *)0);
*outlen = 0;

if (SIMPLEQ_EMPTY(&deltas->entries)(((&deltas->entries)->sqh_first) == ((void *)0)))
return got_error(GOT_ERR_BAD_DELTA_CHAIN20);

err = got_pack_get_delta_chain_max_size(&max_size, deltas, pack);
if (err)
return err;
accum_buf = malloc(max_size);
if (accum_buf == NULL((void *)0))
return got_error_from_errno("malloc");

/* Deltas are ordered in ascending order. */
SIMPLEQ_FOREACH(delta, &deltas->entries, entry)for((delta) = ((&deltas->entries)->sqh_first); (delta
) != ((void *)0); (delta) = ((delta)->entry.sqe_next)) {
int cached = 1;
if (n == 0) {
	size_t delta_data_offset;

	/* Plain object types are the delta base. */
	if (delta->type != GOT_OBJ_TYPE_COMMIT1 &&
	    delta->type != GOT_OBJ_TYPE_TREE2 &&
	    delta->type != GOT_OBJ_TYPE_BLOB3 &&
	    delta->type != GOT_OBJ_TYPE_TAG4) {
		err = got_error(GOT_ERR_BAD_DELTA_CHAIN20);
		goto done;
	}

	delta_data_offset = delta->offset + delta->tslen;
	if (delta_data_offset >= pack->filesize) {
		err = got_error(GOT_ERR_PACK_OFFSET42);
		goto done;
	}
	if (pack->map) {
		size_t mapoff = (size_t)delta_data_offset;
		err = got_inflate_to_mem_mmap(&base_buf,
		    &base_bufsz, NULL((void *)0), NULL((void *)0), pack->map,
		    mapoff, pack->filesize - mapoff);
	} else {
		if (lseek(pack->fd, delta_data_offset, SEEK_SET0)
		    == -1) {
			err = got_error_from_errno("lseek");
			goto done;
		}
		err = got_inflate_to_mem_fd(&base_buf,
		    &base_bufsz, NULL((void *)0), NULL((void *)0), max_size,
		    pack->fd);
	}
	if (err)
		goto done;
	n++;
	continue;
}

got_delta_cache_get(&delta_buf, &delta_len,
    pack->delta_cache, delta->data_offset);
if (delta_buf == NULL((void *)0)) {
	cached = 0;
	err = read_delta_data(&delta_buf, &delta_len,
	    delta->data_offset, pack);
	if (err)
		goto done;
	err = got_delta_cache_add(pack->delta_cache,
	    delta->data_offset, delta_buf, delta_len);
	if (err == NULL((void *)0))
		cached = 1;
	else if (err->code != GOT_ERR_NO_SPACE9) {
		free(delta_buf);
		goto done;
	}
}
err = got_delta_apply_in_mem(base_buf, base_bufsz,
    delta_buf, delta_len, accum_buf,
    &accum_size, max_size);
if (!cached)
	free(delta_buf);
n++;
if (err)
	goto done;

if (n < deltas->nentries) {
	/* Accumulated delta becomes the new base. */
	uint8_t *tmp = accum_buf;
	/*
	 * Base buffer switches roles with accumulation buffer.
	 * Ensure it can hold the largest result in the delta
	 * chain. Initial allocation might have been smaller.
	 */
	if (base_bufsz < max_size) {
		uint8_t *p;
		p = reallocarray(base_buf, 1, max_size);
		if (p == NULL((void *)0)) {
			err = got_error_from_errno(
			    "reallocarray");
			goto done;
		}
		base_buf = p;
		base_bufsz = max_size;
	}
	accum_buf = base_buf;
	base_buf = tmp;
}
}

1334done:
free(base_buf);
if (err) {
free(accum_buf);
*outbuf = NULL((void *)0);
*outlen = 0;
} else {
*outbuf = accum_buf;
*outlen = accum_size;
}
return err;
1345}

1347const struct got_error *
1348got_packfile_extract_object(struct got_pack *pack, struct got_object *obj,
  FILE *outfile, FILE *base_file, FILE *accum_file)
1350{
const struct got_error *err = NULL((void *)0);

if ((obj->flags & GOT_OBJ_FLAG_PACKED0x01) == 0)
return got_error(GOT_ERR_OBJ_NOT_PACKED19);

if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED0x02) == 0) {
if (obj->pack_offset >= pack->filesize)
	return got_error(GOT_ERR_PACK_OFFSET42);

if (pack->map) {
	size_t mapoff = (size_t)obj->pack_offset;
	err = got_inflate_to_file_mmap(&obj->size, NULL((void *)0), NULL((void *)0),
	    pack->map, mapoff, pack->filesize - mapoff,
	    outfile);
} else {
	if (lseek(pack->fd, obj->pack_offset, SEEK_SET0) == -1)
		return got_error_from_errno("lseek");
	err = got_inflate_to_file_fd(&obj->size, NULL((void *)0), NULL((void *)0),
	    pack->fd, outfile);
}
} else
err = got_pack_dump_delta_chain_to_file(&obj->size,
    &obj->deltas, pack, outfile, base_file, accum_file);

return err;
1376}

1378const struct got_error *
1379got_packfile_extract_object_to_mem(uint8_t **buf, size_t *len,
  struct got_object *obj, struct got_pack *pack)
1381{
const struct got_error *err = NULL((void *)0);

if ((obj->flags & GOT_OBJ_FLAG_PACKED0x01) == 0)
return got_error(GOT_ERR_OBJ_NOT_PACKED19);

if ((obj->flags & GOT_OBJ_FLAG_DELTIFIED0x02) == 0) {
if (obj->pack_offset >= pack->filesize)
	return got_error(GOT_ERR_PACK_OFFSET42);
if (pack->map) {
	size_t mapoff = (size_t)obj->pack_offset;
	err = got_inflate_to_mem_mmap(buf, len, NULL((void *)0), NULL((void *)0),
	    pack->map, mapoff, pack->filesize - mapoff);
} else {
	if (lseek(pack->fd, obj->pack_offset, SEEK_SET0) == -1)
		return got_error_from_errno("lseek");
	err = got_inflate_to_mem_fd(buf, len, NULL((void *)0), NULL((void *)0),
	    obj->size, pack->fd);
}
} else
err = got_pack_dump_delta_chain_to_mem(buf, len, &obj->deltas,
    pack);

return err;
1405}