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index-pack.c
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1959 lines (1752 loc) · 51.9 KB
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#include "builtin.h"
#include "config.h"
#include "delta.h"
#include "pack.h"
#include "csum-file.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree.h"
#include "progress.h"
#include "fsck.h"
#include "exec-cmd.h"
#include "streaming.h"
#include "thread-utils.h"
#include "packfile.h"
#include "object-store.h"
#include "promisor-remote.h"
static const char index_pack_usage[] =
"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--[no-]rev-index] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
struct object_entry {
struct pack_idx_entry idx;
unsigned long size;
unsigned char hdr_size;
signed char type;
signed char real_type;
};
struct object_stat {
unsigned delta_depth;
int base_object_no;
};
struct base_data {
/* Initialized by make_base(). */
struct base_data *base;
struct object_entry *obj;
int ref_first, ref_last;
int ofs_first, ofs_last;
/*
* Threads should increment retain_data if they are about to call
* patch_delta() using this struct's data as a base, and decrement this
* when they are done. While retain_data is nonzero, this struct's data
* will not be freed even if the delta base cache limit is exceeded.
*/
int retain_data;
/*
* The number of direct children that have not been fully processed
* (entered work_head, entered done_head, left done_head). When this
* number reaches zero, this struct base_data can be freed.
*/
int children_remaining;
/* Not initialized by make_base(). */
struct list_head list;
void *data;
unsigned long size;
};
/*
* Stack of struct base_data that have unprocessed children.
* threaded_second_pass() uses this as a source of work (the other being the
* objects array).
*
* Guarded by work_mutex.
*/
static LIST_HEAD(work_head);
/*
* Stack of struct base_data that have children, all of whom have been
* processed or are being processed, and at least one child is being processed.
* These struct base_data must be kept around until the last child is
* processed.
*
* Guarded by work_mutex.
*/
static LIST_HEAD(done_head);
/*
* All threads share one delta base cache.
*
* base_cache_used is guarded by work_mutex, and base_cache_limit is read-only
* in a thread.
*/
static size_t base_cache_used;
static size_t base_cache_limit;
struct thread_local {
pthread_t thread;
int pack_fd;
};
/* Remember to update object flag allocation in object.h */
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
struct ofs_delta_entry {
off_t offset;
int obj_no;
};
struct ref_delta_entry {
struct object_id oid;
int obj_no;
};
static struct object_entry *objects;
static struct object_stat *obj_stat;
static struct ofs_delta_entry *ofs_deltas;
static struct ref_delta_entry *ref_deltas;
static struct thread_local nothread_data;
static int nr_objects;
static int nr_ofs_deltas;
static int nr_ref_deltas;
static int ref_deltas_alloc;
static int nr_resolved_deltas;
static int nr_threads;
static int from_stdin;
static int strict;
static int do_fsck_object;
static struct fsck_options fsck_options = FSCK_OPTIONS_MISSING_GITMODULES;
static int verbose;
static const char *progress_title;
static int show_resolving_progress;
static int show_stat;
static int check_self_contained_and_connected;
static struct progress *progress;
/* We always read in 4kB chunks. */
static unsigned char input_buffer[4096];
static unsigned int input_offset, input_len;
static off_t consumed_bytes;
static off_t max_input_size;
static unsigned deepest_delta;
static git_hash_ctx input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd;
static const char *curr_pack;
static struct thread_local *thread_data;
static int nr_dispatched;
static int threads_active;
static pthread_mutex_t read_mutex;
#define read_lock() lock_mutex(&read_mutex)
#define read_unlock() unlock_mutex(&read_mutex)
static pthread_mutex_t counter_mutex;
#define counter_lock() lock_mutex(&counter_mutex)
#define counter_unlock() unlock_mutex(&counter_mutex)
static pthread_mutex_t work_mutex;
#define work_lock() lock_mutex(&work_mutex)
#define work_unlock() unlock_mutex(&work_mutex)
static pthread_mutex_t deepest_delta_mutex;
#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
static pthread_key_t key;
static inline void lock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_lock(mutex);
}
static inline void unlock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_unlock(mutex);
}
/*
* Mutex and conditional variable can't be statically-initialized on Windows.
*/
static void init_thread(void)
{
int i;
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
if (show_stat)
pthread_mutex_init(&deepest_delta_mutex, NULL);
pthread_key_create(&key, NULL);
CALLOC_ARRAY(thread_data, nr_threads);
for (i = 0; i < nr_threads; i++) {
thread_data[i].pack_fd = xopen(curr_pack, O_RDONLY);
}
threads_active = 1;
}
static void cleanup_thread(void)
{
int i;
if (!threads_active)
return;
threads_active = 0;
pthread_mutex_destroy(&read_mutex);
pthread_mutex_destroy(&counter_mutex);
pthread_mutex_destroy(&work_mutex);
if (show_stat)
pthread_mutex_destroy(&deepest_delta_mutex);
for (i = 0; i < nr_threads; i++)
close(thread_data[i].pack_fd);
pthread_key_delete(key);
free(thread_data);
}
static int mark_link(struct object *obj, enum object_type type,
void *data, struct fsck_options *options)
{
if (!obj)
return -1;
if (type != OBJ_ANY && obj->type != type)
die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
obj->flags |= FLAG_LINK;
return 0;
}
/* The content of each linked object must have been checked
or it must be already present in the object database */
static unsigned check_object(struct object *obj)
{
if (!obj)
return 0;
if (!(obj->flags & FLAG_LINK))
return 0;
if (!(obj->flags & FLAG_CHECKED)) {
unsigned long size;
int type = oid_object_info(the_repository, &obj->oid, &size);
if (type <= 0)
die(_("did not receive expected object %s"),
oid_to_hex(&obj->oid));
if (type != obj->type)
die(_("object %s: expected type %s, found %s"),
oid_to_hex(&obj->oid),
type_name(obj->type), type_name(type));
obj->flags |= FLAG_CHECKED;
return 1;
}
return 0;
}
static unsigned check_objects(void)
{
unsigned i, max, foreign_nr = 0;
max = get_max_object_index();
if (verbose)
progress = start_delayed_progress(_("Checking objects"), max);
for (i = 0; i < max; i++) {
foreign_nr += check_object(get_indexed_object(i));
display_progress(progress, i + 1);
}
stop_progress(&progress);
return foreign_nr;
}
/* Discard current buffer used content. */
static void flush(void)
{
if (input_offset) {
if (output_fd >= 0)
write_or_die(output_fd, input_buffer, input_offset);
the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset);
memmove(input_buffer, input_buffer + input_offset, input_len);
input_offset = 0;
}
}
/*
* Make sure at least "min" bytes are available in the buffer, and
* return the pointer to the buffer.
*/
static void *fill(int min)
{
if (min <= input_len)
return input_buffer + input_offset;
if (min > sizeof(input_buffer))
die(Q_("cannot fill %d byte",
"cannot fill %d bytes",
min),
min);
flush();
do {
ssize_t ret = xread(input_fd, input_buffer + input_len,
sizeof(input_buffer) - input_len);
if (ret <= 0) {
if (!ret)
die(_("early EOF"));
die_errno(_("read error on input"));
}
input_len += ret;
if (from_stdin)
display_throughput(progress, consumed_bytes + input_len);
} while (input_len < min);
return input_buffer;
}
static void use(int bytes)
{
if (bytes > input_len)
die(_("used more bytes than were available"));
input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
input_len -= bytes;
input_offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die(_("pack too large for current definition of off_t"));
consumed_bytes += bytes;
if (max_input_size && consumed_bytes > max_input_size) {
struct strbuf size_limit = STRBUF_INIT;
strbuf_humanise_bytes(&size_limit, max_input_size);
die(_("pack exceeds maximum allowed size (%s)"),
size_limit.buf);
}
}
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
struct strbuf tmp_file = STRBUF_INIT;
output_fd = odb_mkstemp(&tmp_file,
"pack/tmp_pack_XXXXXX");
pack_name = strbuf_detach(&tmp_file, NULL);
} else {
output_fd = xopen(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
}
nothread_data.pack_fd = output_fd;
} else {
input_fd = xopen(pack_name, O_RDONLY);
output_fd = -1;
nothread_data.pack_fd = input_fd;
}
the_hash_algo->init_fn(&input_ctx);
return pack_name;
}
static void parse_pack_header(void)
{
struct pack_header *hdr = fill(sizeof(struct pack_header));
/* Header consistency check */
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
die(_("pack signature mismatch"));
if (!pack_version_ok(hdr->hdr_version))
die(_("pack version %"PRIu32" unsupported"),
ntohl(hdr->hdr_version));
nr_objects = ntohl(hdr->hdr_entries);
use(sizeof(struct pack_header));
}
__attribute__((format (printf, 2, 3)))
static NORETURN void bad_object(off_t offset, const char *format, ...)
{
va_list params;
char buf[1024];
va_start(params, format);
vsnprintf(buf, sizeof(buf), format, params);
va_end(params);
die(_("pack has bad object at offset %"PRIuMAX": %s"),
(uintmax_t)offset, buf);
}
static inline struct thread_local *get_thread_data(void)
{
if (HAVE_THREADS) {
if (threads_active)
return pthread_getspecific(key);
assert(!threads_active &&
"This should only be reached when all threads are gone");
}
return ¬hread_data;
}
static void set_thread_data(struct thread_local *data)
{
if (threads_active)
pthread_setspecific(key, data);
}
static void free_base_data(struct base_data *c)
{
if (c->data) {
FREE_AND_NULL(c->data);
base_cache_used -= c->size;
}
}
static void prune_base_data(struct base_data *retain)
{
struct list_head *pos;
if (base_cache_used <= base_cache_limit)
return;
list_for_each_prev(pos, &done_head) {
struct base_data *b = list_entry(pos, struct base_data, list);
if (b->retain_data || b == retain)
continue;
if (b->data) {
free_base_data(b);
if (base_cache_used <= base_cache_limit)
return;
}
}
list_for_each_prev(pos, &work_head) {
struct base_data *b = list_entry(pos, struct base_data, list);
if (b->retain_data || b == retain)
continue;
if (b->data) {
free_base_data(b);
if (base_cache_used <= base_cache_limit)
return;
}
}
}
static int is_delta_type(enum object_type type)
{
return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
}
static void *unpack_entry_data(off_t offset, unsigned long size,
enum object_type type, struct object_id *oid)
{
static char fixed_buf[8192];
int status;
git_zstream stream;
void *buf;
git_hash_ctx c;
char hdr[32];
int hdrlen;
if (!is_delta_type(type)) {
hdrlen = format_object_header(hdr, sizeof(hdr), type, size);
the_hash_algo->init_fn(&c);
the_hash_algo->update_fn(&c, hdr, hdrlen);
} else
oid = NULL;
if (type == OBJ_BLOB && size > big_file_threshold)
buf = fixed_buf;
else
buf = xmallocz(size);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = buf;
stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
do {
unsigned char *last_out = stream.next_out;
stream.next_in = fill(1);
stream.avail_in = input_len;
status = git_inflate(&stream, 0);
use(input_len - stream.avail_in);
if (oid)
the_hash_algo->update_fn(&c, last_out, stream.next_out - last_out);
if (buf == fixed_buf) {
stream.next_out = buf;
stream.avail_out = sizeof(fixed_buf);
}
} while (status == Z_OK);
if (stream.total_out != size || status != Z_STREAM_END)
bad_object(offset, _("inflate returned %d"), status);
git_inflate_end(&stream);
if (oid)
the_hash_algo->final_oid_fn(oid, &c);
return buf == fixed_buf ? NULL : buf;
}
static void *unpack_raw_entry(struct object_entry *obj,
off_t *ofs_offset,
struct object_id *ref_oid,
struct object_id *oid)
{
unsigned char *p;
unsigned long size, c;
off_t base_offset;
unsigned shift;
void *data;
obj->idx.offset = consumed_bytes;
input_crc32 = crc32(0, NULL, 0);
p = fill(1);
c = *p;
use(1);
obj->type = (c >> 4) & 7;
size = (c & 15);
shift = 4;
while (c & 0x80) {
p = fill(1);
c = *p;
use(1);
size += (c & 0x7f) << shift;
shift += 7;
}
obj->size = size;
switch (obj->type) {
case OBJ_REF_DELTA:
oidread(ref_oid, fill(the_hash_algo->rawsz));
use(the_hash_algo->rawsz);
break;
case OBJ_OFS_DELTA:
p = fill(1);
c = *p;
use(1);
base_offset = c & 127;
while (c & 128) {
base_offset += 1;
if (!base_offset || MSB(base_offset, 7))
bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
p = fill(1);
c = *p;
use(1);
base_offset = (base_offset << 7) + (c & 127);
}
*ofs_offset = obj->idx.offset - base_offset;
if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
bad_object(obj->idx.offset, _("delta base offset is out of bound"));
break;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
break;
default:
bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
}
obj->hdr_size = consumed_bytes - obj->idx.offset;
data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, oid);
obj->idx.crc32 = input_crc32;
return data;
}
static void *unpack_data(struct object_entry *obj,
int (*consume)(const unsigned char *, unsigned long, void *),
void *cb_data)
{
off_t from = obj[0].idx.offset + obj[0].hdr_size;
off_t len = obj[1].idx.offset - from;
unsigned char *data, *inbuf;
git_zstream stream;
int status;
data = xmallocz(consume ? 64*1024 : obj->size);
inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = data;
stream.avail_out = consume ? 64*1024 : obj->size;
do {
ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
if (n < 0)
die_errno(_("cannot pread pack file"));
if (!n)
die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
"premature end of pack file, %"PRIuMAX" bytes missing",
len),
(uintmax_t)len);
from += n;
len -= n;
stream.next_in = inbuf;
stream.avail_in = n;
if (!consume)
status = git_inflate(&stream, 0);
else {
do {
status = git_inflate(&stream, 0);
if (consume(data, stream.next_out - data, cb_data)) {
free(inbuf);
free(data);
return NULL;
}
stream.next_out = data;
stream.avail_out = 64*1024;
} while (status == Z_OK && stream.avail_in);
}
} while (len && status == Z_OK && !stream.avail_in);
/* This has been inflated OK when first encountered, so... */
if (status != Z_STREAM_END || stream.total_out != obj->size)
die(_("serious inflate inconsistency"));
git_inflate_end(&stream);
free(inbuf);
if (consume) {
FREE_AND_NULL(data);
}
return data;
}
static void *get_data_from_pack(struct object_entry *obj)
{
return unpack_data(obj, NULL, NULL);
}
static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return offset1 < offset2 ? -1 :
offset1 > offset2 ? 1 :
0;
}
static int find_ofs_delta(const off_t offset)
{
int first = 0, last = nr_ofs_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ofs_delta_entry *delta = &ofs_deltas[next];
int cmp;
cmp = compare_ofs_delta_bases(offset, delta->offset,
OBJ_OFS_DELTA,
objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ofs_delta_children(off_t offset,
int *first_index, int *last_index)
{
int first = find_ofs_delta(offset);
int last = first;
int end = nr_ofs_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && ofs_deltas[first - 1].offset == offset)
--first;
while (last < end && ofs_deltas[last + 1].offset == offset)
++last;
*first_index = first;
*last_index = last;
}
static int compare_ref_delta_bases(const struct object_id *oid1,
const struct object_id *oid2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return oidcmp(oid1, oid2);
}
static int find_ref_delta(const struct object_id *oid)
{
int first = 0, last = nr_ref_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ref_delta_entry *delta = &ref_deltas[next];
int cmp;
cmp = compare_ref_delta_bases(oid, &delta->oid,
OBJ_REF_DELTA,
objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ref_delta_children(const struct object_id *oid,
int *first_index, int *last_index)
{
int first = find_ref_delta(oid);
int last = first;
int end = nr_ref_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid))
--first;
while (last < end && oideq(&ref_deltas[last + 1].oid, oid))
++last;
*first_index = first;
*last_index = last;
}
struct compare_data {
struct object_entry *entry;
struct git_istream *st;
unsigned char *buf;
unsigned long buf_size;
};
static int compare_objects(const unsigned char *buf, unsigned long size,
void *cb_data)
{
struct compare_data *data = cb_data;
if (data->buf_size < size) {
free(data->buf);
data->buf = xmalloc(size);
data->buf_size = size;
}
while (size) {
ssize_t len = read_istream(data->st, data->buf, size);
if (len == 0)
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&data->entry->idx.oid));
if (len < 0)
die(_("unable to read %s"),
oid_to_hex(&data->entry->idx.oid));
if (memcmp(buf, data->buf, len))
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&data->entry->idx.oid));
size -= len;
buf += len;
}
return 0;
}
static int check_collison(struct object_entry *entry)
{
struct compare_data data;
enum object_type type;
unsigned long size;
if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
return -1;
memset(&data, 0, sizeof(data));
data.entry = entry;
data.st = open_istream(the_repository, &entry->idx.oid, &type, &size,
NULL);
if (!data.st)
return -1;
if (size != entry->size || type != entry->type)
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&entry->idx.oid));
unpack_data(entry, compare_objects, &data);
close_istream(data.st);
free(data.buf);
return 0;
}
static void sha1_object(const void *data, struct object_entry *obj_entry,
unsigned long size, enum object_type type,
const struct object_id *oid)
{
void *new_data = NULL;
int collision_test_needed = 0;
assert(data || obj_entry);
if (startup_info->have_repository) {
read_lock();
collision_test_needed =
has_object_file_with_flags(oid, OBJECT_INFO_QUICK);
read_unlock();
}
if (collision_test_needed && !data) {
read_lock();
if (!check_collison(obj_entry))
collision_test_needed = 0;
read_unlock();
}
if (collision_test_needed) {
void *has_data;
enum object_type has_type;
unsigned long has_size;
read_lock();
has_type = oid_object_info(the_repository, oid, &has_size);
if (has_type < 0)
die(_("cannot read existing object info %s"), oid_to_hex(oid));
if (has_type != type || has_size != size)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
has_data = read_object_file(oid, &has_type, &has_size);
read_unlock();
if (!data)
data = new_data = get_data_from_pack(obj_entry);
if (!has_data)
die(_("cannot read existing object %s"), oid_to_hex(oid));
if (size != has_size || type != has_type ||
memcmp(data, has_data, size) != 0)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
free(has_data);
}
if (strict || do_fsck_object) {
read_lock();
if (type == OBJ_BLOB) {
struct blob *blob = lookup_blob(the_repository, oid);
if (blob)
blob->object.flags |= FLAG_CHECKED;
else
die(_("invalid blob object %s"), oid_to_hex(oid));
if (do_fsck_object &&
fsck_object(&blob->object, (void *)data, size, &fsck_options))
die(_("fsck error in packed object"));
} else {
struct object *obj;
int eaten;
void *buf = (void *) data;
assert(data && "data can only be NULL for large _blobs_");
/*
* we do not need to free the memory here, as the
* buf is deleted by the caller.
*/
obj = parse_object_buffer(the_repository, oid, type,
size, buf,
&eaten);
if (!obj)
die(_("invalid %s"), type_name(type));
if (do_fsck_object &&
fsck_object(obj, buf, size, &fsck_options))
die(_("fsck error in packed object"));
if (strict && fsck_walk(obj, NULL, &fsck_options))
die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
if (obj->type == OBJ_TREE) {
struct tree *item = (struct tree *) obj;
item->buffer = NULL;
obj->parsed = 0;
}
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
if (detach_commit_buffer(commit, NULL) != data)
BUG("parse_object_buffer transmogrified our buffer");
}
obj->flags |= FLAG_CHECKED;
}
read_unlock();
}
free(new_data);
}
/*
* Ensure that this node has been reconstructed and return its contents.
*
* In the typical and best case, this node would already be reconstructed
* (through the invocation to resolve_delta() in threaded_second_pass()) and it
* would not be pruned. However, if pruning of this node was necessary due to
* reaching delta_base_cache_limit, this function will find the closest
* ancestor with reconstructed data that has not been pruned (or if there is
* none, the ultimate base object), and reconstruct each node in the delta
* chain in order to generate the reconstructed data for this node.
*/
static void *get_base_data(struct base_data *c)
{
if (!c->data) {
struct object_entry *obj = c->obj;
struct base_data **delta = NULL;
int delta_nr = 0, delta_alloc = 0;
while (is_delta_type(c->obj->type) && !c->data) {
ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
delta[delta_nr++] = c;
c = c->base;
}
if (!delta_nr) {
c->data = get_data_from_pack(obj);
c->size = obj->size;
base_cache_used += c->size;
prune_base_data(c);
}
for (; delta_nr > 0; delta_nr--) {
void *base, *raw;
c = delta[delta_nr - 1];
obj = c->obj;
base = get_base_data(c->base);
raw = get_data_from_pack(obj);
c->data = patch_delta(
base, c->base->size,
raw, obj->size,
&c->size);
free(raw);
if (!c->data)
bad_object(obj->idx.offset, _("failed to apply delta"));
base_cache_used += c->size;
prune_base_data(c);
}
free(delta);
}
return c->data;
}
static struct base_data *make_base(struct object_entry *obj,
struct base_data *parent)
{
struct base_data *base = xcalloc(1, sizeof(struct base_data));
base->base = parent;
base->obj = obj;
find_ref_delta_children(&obj->idx.oid,
&base->ref_first, &base->ref_last);
find_ofs_delta_children(obj->idx.offset,
&base->ofs_first, &base->ofs_last);
base->children_remaining = base->ref_last - base->ref_first +
base->ofs_last - base->ofs_first + 2;
return base;
}
static struct base_data *resolve_delta(struct object_entry *delta_obj,
struct base_data *base)
{
void *delta_data, *result_data;
struct base_data *result;
unsigned long result_size;
if (show_stat) {
int i = delta_obj - objects;
int j = base->obj - objects;
obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
deepest_delta_lock();
if (deepest_delta < obj_stat[i].delta_depth)
deepest_delta = obj_stat[i].delta_depth;
deepest_delta_unlock();
obj_stat[i].base_object_no = j;
}
delta_data = get_data_from_pack(delta_obj);
assert(base->data);
result_data = patch_delta(base->data, base->size,
delta_data, delta_obj->size, &result_size);
free(delta_data);
if (!result_data)
bad_object(delta_obj->idx.offset, _("failed to apply delta"));
hash_object_file(the_hash_algo, result_data, result_size,
delta_obj->real_type, &delta_obj->idx.oid);
sha1_object(result_data, NULL, result_size, delta_obj->real_type,
&delta_obj->idx.oid);
result = make_base(delta_obj, base);
result->data = result_data;
result->size = result_size;
counter_lock();
nr_resolved_deltas++;
counter_unlock();
return result;
}
static int compare_ofs_delta_entry(const void *a, const void *b)
{
const struct ofs_delta_entry *delta_a = a;
const struct ofs_delta_entry *delta_b = b;
return delta_a->offset < delta_b->offset ? -1 :
delta_a->offset > delta_b->offset ? 1 :
0;
}