1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
#include "cache.h"
#include "split-index.h"
struct split_index *init_split_index(struct index_state *istate)
{
if (!istate->split_index) {
istate->split_index = xcalloc(1, sizeof(*istate->split_index));
istate->split_index->refcount = 1;
}
return istate->split_index;
}
int read_link_extension(struct index_state *istate,
const void *data_, unsigned long sz)
{
const unsigned char *data = data_;
struct split_index *si;
if (sz < 20)
return error("corrupt link extension (too short)");
si = init_split_index(istate);
hashcpy(si->base_sha1, data);
data += 20;
sz -= 20;
if (sz)
return error("garbage at the end of link extension");
return 0;
}
int write_link_extension(struct strbuf *sb,
struct index_state *istate)
{
struct split_index *si = istate->split_index;
strbuf_add(sb, si->base_sha1, 20);
return 0;
}
static void mark_base_index_entries(struct index_state *base)
{
int i;
/*
* To keep track of the shared entries between
* istate->base->cache[] and istate->cache[], base entry
* position is stored in each base entry. All positions start
* from 1 instead of 0, which is resrved to say "this is a new
* entry".
*/
for (i = 0; i < base->cache_nr; i++)
base->cache[i]->index = i + 1;
}
void merge_base_index(struct index_state *istate)
{
struct split_index *si = istate->split_index;
mark_base_index_entries(si->base);
istate->cache_nr = si->base->cache_nr;
ALLOC_GROW(istate->cache, istate->cache_nr, istate->cache_alloc);
memcpy(istate->cache, si->base->cache,
sizeof(*istate->cache) * istate->cache_nr);
}
void prepare_to_write_split_index(struct index_state *istate)
{
struct split_index *si = init_split_index(istate);
/* take cache[] out temporarily */
si->saved_cache_nr = istate->cache_nr;
istate->cache_nr = 0;
}
void finish_writing_split_index(struct index_state *istate)
{
struct split_index *si = init_split_index(istate);
istate->cache_nr = si->saved_cache_nr;
}
void discard_split_index(struct index_state *istate)
{
struct split_index *si = istate->split_index;
if (!si)
return;
istate->split_index = NULL;
si->refcount--;
if (si->refcount)
return;
if (si->base) {
discard_index(si->base);
free(si->base);
}
free(si);
}
void save_or_free_index_entry(struct index_state *istate, struct cache_entry *ce)
{
if (ce->index &&
istate->split_index &&
istate->split_index->base &&
ce->index <= istate->split_index->base->cache_nr &&
ce == istate->split_index->base->cache[ce->index - 1])
ce->ce_flags |= CE_REMOVE;
else
free(ce);
}
void replace_index_entry_in_base(struct index_state *istate,
struct cache_entry *old,
struct cache_entry *new)
{
if (old->index &&
istate->split_index &&
istate->split_index->base &&
old->index <= istate->split_index->base->cache_nr) {
new->index = old->index;
if (old != istate->split_index->base->cache[new->index - 1])
free(istate->split_index->base->cache[new->index - 1]);
istate->split_index->base->cache[new->index - 1] = new;
}
}
|
