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        #include "cache.h"
      
        #include "oidset.h"
      
        struct oidset_entry {
      
        	struct hashmap_entry hash;
      
        	struct object_id oid;
      
        };
      
        static int oidset_hashcmp(const void *unused_cmp_data,
      
        			  const void *va, const void *vb,
      
        			  const void *vkey)
      
        {
      
        	const struct oidset_entry *a = va, *b = vb;
      
        	const struct object_id *key = vkey;
      
        	return oidcmp(&a->oid, key ? key : &b->oid);
      
        }
      
        int oidset_contains(const struct oidset *set, const struct object_id *oid)
      
        {
      
        	struct hashmap_entry key;
      
        	if (!set->map.cmpfn)
      
        		return 0;
      
        	hashmap_entry_init(&key, sha1hash(oid->hash));
      
        	return !!hashmap_get(&set->map, &key, oid);
      
        }
      
        int oidset_insert(struct oidset *set, const struct object_id *oid)
      
        {
      
        	struct oidset_entry *entry;
      
        	if (!set->map.cmpfn)
      
        		hashmap_init(&set->map, oidset_hashcmp, NULL, 0);
      
        	if (oidset_contains(set, oid))
      
        		return 1;
      
        	entry = xmalloc(sizeof(*entry));
      
        	hashmap_entry_init(&entry->hash, sha1hash(oid->hash));
      
        	oidcpy(&entry->oid, oid);
      
        	hashmap_add(&set->map, entry);
      
        	return 0;
      
        }
      
        void oidset_clear(struct oidset *set)
      
        {
      
        	hashmap_free(&set->map, 1);
      
        }