Git 1.7.9.7
[git/git.git] / patch-ids.c
CommitLineData
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1#include "cache.h"
2#include "diff.h"
3#include "commit.h"
5289bae1 4#include "sha1-lookup.h"
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5#include "patch-ids.h"
6
7static int commit_patch_id(struct commit *commit, struct diff_options *options,
8 unsigned char *sha1)
9{
10 if (commit->parents)
11 diff_tree_sha1(commit->parents->item->object.sha1,
12 commit->object.sha1, "", options);
13 else
14 diff_root_tree_sha1(commit->object.sha1, "", options);
15 diffcore_std(options);
16 return diff_flush_patch_id(options, sha1);
17}
18
5289bae1 19static const unsigned char *patch_id_access(size_t index, void *table)
5d23e133 20{
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21 struct patch_id **id_table = table;
22 return id_table[index]->patch_id;
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23}
24
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25static int patch_pos(struct patch_id **table, int nr, const unsigned char *id)
26{
5289bae1 27 return sha1_pos(id, table, nr, patch_id_access);
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28}
29
30#define BUCKET_SIZE 190 /* 190 * 21 = 3990, with slop close enough to 4K */
31struct patch_id_bucket {
32 struct patch_id_bucket *next;
33 int nr;
34 struct patch_id bucket[BUCKET_SIZE];
35};
36
37int init_patch_ids(struct patch_ids *ids)
38{
39 memset(ids, 0, sizeof(*ids));
40 diff_setup(&ids->diffopts);
8f67f8ae 41 DIFF_OPT_SET(&ids->diffopts, RECURSIVE);
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42 if (diff_setup_done(&ids->diffopts) < 0)
43 return error("diff_setup_done failed");
44 return 0;
45}
46
47int free_patch_ids(struct patch_ids *ids)
48{
49 struct patch_id_bucket *next, *patches;
50
51 free(ids->table);
52 for (patches = ids->patches; patches; patches = next) {
53 next = patches->next;
54 free(patches);
55 }
56 return 0;
57}
58
59static struct patch_id *add_commit(struct commit *commit,
60 struct patch_ids *ids,
61 int no_add)
62{
63 struct patch_id_bucket *bucket;
64 struct patch_id *ent;
65 unsigned char sha1[20];
66 int pos;
67
68 if (commit_patch_id(commit, &ids->diffopts, sha1))
69 return NULL;
70 pos = patch_pos(ids->table, ids->nr, sha1);
71 if (0 <= pos)
72 return ids->table[pos];
73 if (no_add)
74 return NULL;
75
76 pos = -1 - pos;
77
78 bucket = ids->patches;
79 if (!bucket || (BUCKET_SIZE <= bucket->nr)) {
80 bucket = xcalloc(1, sizeof(*bucket));
81 bucket->next = ids->patches;
82 ids->patches = bucket;
83 }
84 ent = &bucket->bucket[bucket->nr++];
85 hashcpy(ent->patch_id, sha1);
86
87 if (ids->alloc <= ids->nr) {
88 ids->alloc = alloc_nr(ids->nr);
89 ids->table = xrealloc(ids->table, sizeof(ent) * ids->alloc);
90 }
91 if (pos < ids->nr)
92 memmove(ids->table + pos + 1, ids->table + pos,
93 sizeof(ent) * (ids->nr - pos));
94 ids->nr++;
95 ids->table[pos] = ent;
96 return ids->table[pos];
97}
98
99struct patch_id *has_commit_patch_id(struct commit *commit,
100 struct patch_ids *ids)
101{
102 return add_commit(commit, ids, 1);
103}
104
105struct patch_id *add_commit_patch_id(struct commit *commit,
106 struct patch_ids *ids)
107{
108 return add_commit(commit, ids, 0);
109}