Merge branch 'esr/maint-doc-fast-import'
[git.git] / patch-ids.c
blobbc8a28fdd71ae1476002d26adec64f54841f5cba
1 #include "cache.h"
2 #include "diff.h"
3 #include "commit.h"
4 #include "sha1-lookup.h"
5 #include "patch-ids.h"
7 static int commit_patch_id(struct commit *commit, struct diff_options *options,
8 unsigned char *sha1)
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);
19 static const unsigned char *patch_id_access(size_t index, void *table)
21 struct patch_id **id_table = table;
22 return id_table[index]->patch_id;
25 static int patch_pos(struct patch_id **table, int nr, const unsigned char *id)
27 return sha1_pos(id, table, nr, patch_id_access);
30 #define BUCKET_SIZE 190 /* 190 * 21 = 3990, with slop close enough to 4K */
31 struct patch_id_bucket {
32 struct patch_id_bucket *next;
33 int nr;
34 struct patch_id bucket[BUCKET_SIZE];
37 int init_patch_ids(struct patch_ids *ids)
39 memset(ids, 0, sizeof(*ids));
40 diff_setup(&ids->diffopts);
41 DIFF_OPT_SET(&ids->diffopts, RECURSIVE);
42 diff_setup_done(&ids->diffopts);
43 return 0;
46 int free_patch_ids(struct patch_ids *ids)
48 struct patch_id_bucket *next, *patches;
50 free(ids->table);
51 for (patches = ids->patches; patches; patches = next) {
52 next = patches->next;
53 free(patches);
55 return 0;
58 static struct patch_id *add_commit(struct commit *commit,
59 struct patch_ids *ids,
60 int no_add)
62 struct patch_id_bucket *bucket;
63 struct patch_id *ent;
64 unsigned char sha1[20];
65 int pos;
67 if (commit_patch_id(commit, &ids->diffopts, sha1))
68 return NULL;
69 pos = patch_pos(ids->table, ids->nr, sha1);
70 if (0 <= pos)
71 return ids->table[pos];
72 if (no_add)
73 return NULL;
75 pos = -1 - pos;
77 bucket = ids->patches;
78 if (!bucket || (BUCKET_SIZE <= bucket->nr)) {
79 bucket = xcalloc(1, sizeof(*bucket));
80 bucket->next = ids->patches;
81 ids->patches = bucket;
83 ent = &bucket->bucket[bucket->nr++];
84 hashcpy(ent->patch_id, sha1);
86 if (ids->alloc <= ids->nr) {
87 ids->alloc = alloc_nr(ids->nr);
88 ids->table = xrealloc(ids->table, sizeof(ent) * ids->alloc);
90 if (pos < ids->nr)
91 memmove(ids->table + pos + 1, ids->table + pos,
92 sizeof(ent) * (ids->nr - pos));
93 ids->nr++;
94 ids->table[pos] = ent;
95 return ids->table[pos];
98 struct patch_id *has_commit_patch_id(struct commit *commit,
99 struct patch_ids *ids)
101 return add_commit(commit, ids, 1);
104 struct patch_id *add_commit_patch_id(struct commit *commit,
105 struct patch_ids *ids)
107 return add_commit(commit, ids, 0);