| #ifndef OIDSET_H |
| #define OIDSET_H |
| |
| #include "khash.h" |
| |
| /** |
| * This API is similar to oid-array, in that it maintains a set of object ids |
| * in a memory-efficient way. The major differences are: |
| * |
| * 1. It uses a hash, so we can do online duplicate removal, rather than |
| * sort-and-uniq at the end. This can reduce memory footprint if you have |
| * a large list of oids with many duplicates. |
| * |
| * 2. The per-unique-oid memory footprint is slightly higher due to hash |
| * table overhead. |
| */ |
| |
| /** |
| * A single oidset; should be zero-initialized (or use OIDSET_INIT). |
| */ |
| struct oidset { |
| kh_oid_set_t set; |
| }; |
| |
| #define OIDSET_INIT { { 0 } } |
| |
| |
| /** |
| * Initialize the oidset structure `set`. |
| * |
| * If `initial_size` is bigger than 0 then preallocate to allow inserting |
| * the specified number of elements without further allocations. |
| */ |
| void oidset_init(struct oidset *set, size_t initial_size); |
| |
| /** |
| * Returns true iff `set` contains `oid`. |
| */ |
| int oidset_contains(const struct oidset *set, const struct object_id *oid); |
| |
| /** |
| * Insert the oid into the set; a copy is made, so "oid" does not need |
| * to persist after this function is called. |
| * |
| * Returns 1 if the oid was already in the set, 0 otherwise. This can be used |
| * to perform an efficient check-and-add. |
| */ |
| int oidset_insert(struct oidset *set, const struct object_id *oid); |
| |
| /** |
| * Remove the oid from the set. |
| * |
| * Returns 1 if the oid was present in the set, 0 otherwise. |
| */ |
| int oidset_remove(struct oidset *set, const struct object_id *oid); |
| |
| /** |
| * Returns the number of oids in the set. |
| */ |
| int oidset_size(struct oidset *set); |
| |
| /** |
| * Remove all entries from the oidset, freeing any resources associated with |
| * it. |
| */ |
| void oidset_clear(struct oidset *set); |
| |
| /** |
| * Add the contents of the file 'path' to an initialized oidset. Each line is |
| * an unabbreviated object name. Comments begin with '#', and trailing comments |
| * are allowed. Leading whitespace and empty or white-space only lines are |
| * ignored. |
| */ |
| void oidset_parse_file(struct oidset *set, const char *path); |
| |
| struct oidset_iter { |
| kh_oid_set_t *set; |
| khiter_t iter; |
| }; |
| |
| static inline void oidset_iter_init(struct oidset *set, |
| struct oidset_iter *iter) |
| { |
| iter->set = &set->set; |
| iter->iter = kh_begin(iter->set); |
| } |
| |
| static inline struct object_id *oidset_iter_next(struct oidset_iter *iter) |
| { |
| for (; iter->iter != kh_end(iter->set); iter->iter++) { |
| if (kh_exist(iter->set, iter->iter)) |
| return &kh_key(iter->set, iter->iter++); |
| } |
| return NULL; |
| } |
| |
| static inline struct object_id *oidset_iter_first(struct oidset *set, |
| struct oidset_iter *iter) |
| { |
| oidset_iter_init(set, iter); |
| return oidset_iter_next(iter); |
| } |
| |
| #endif /* OIDSET_H */ |