83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/*
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* decorate.c - decorate a git object with some arbitrary
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* data.
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*/
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#include "cache.h"
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#include "object.h"
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#include "decorate.h"
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static unsigned int hash_obj(const struct object *obj, unsigned int n)
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{
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return oidhash(&obj->oid) % n;
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}
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static void *insert_decoration(struct decoration *n, const struct object *base, void *decoration)
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{
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int size = n->size;
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struct decoration_entry *entries = n->entries;
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unsigned int j = hash_obj(base, size);
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while (entries[j].base) {
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if (entries[j].base == base) {
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void *old = entries[j].decoration;
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entries[j].decoration = decoration;
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return old;
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}
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if (++j >= size)
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j = 0;
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}
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entries[j].base = base;
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entries[j].decoration = decoration;
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n->nr++;
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return NULL;
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}
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static void grow_decoration(struct decoration *n)
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{
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int i;
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int old_size = n->size;
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struct decoration_entry *old_entries = n->entries;
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n->size = (old_size + 1000) * 3 / 2;
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n->entries = xcalloc(n->size, sizeof(struct decoration_entry));
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n->nr = 0;
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for (i = 0; i < old_size; i++) {
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const struct object *base = old_entries[i].base;
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void *decoration = old_entries[i].decoration;
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if (!decoration)
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continue;
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insert_decoration(n, base, decoration);
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}
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free(old_entries);
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}
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void *add_decoration(struct decoration *n, const struct object *obj,
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void *decoration)
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{
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int nr = n->nr + 1;
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if (nr > n->size * 2 / 3)
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grow_decoration(n);
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return insert_decoration(n, obj, decoration);
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}
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void *lookup_decoration(struct decoration *n, const struct object *obj)
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{
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unsigned int j;
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/* nothing to lookup */
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if (!n->size)
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return NULL;
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j = hash_obj(obj, n->size);
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for (;;) {
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struct decoration_entry *ref = n->entries + j;
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if (ref->base == obj)
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return ref->decoration;
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if (!ref->base)
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return NULL;
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if (++j == n->size)
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j = 0;
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}
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}
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