2 * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
9 #ifndef OSSL_UINT_SET_H
10 # define OSSL_UINT_SET_H
12 #include "openssl/params.h"
13 #include "internal/list.h"
16 * uint64_t Integer Sets
17 * =====================
19 * Utilities for managing a logical set of unsigned 64-bit integers. The
20 * structure tracks each contiguous range of integers using one allocation and
21 * is thus optimised for cases where integers tend to appear consecutively.
22 * Queries are optimised under the assumption that they will generally be made
23 * on integers near the end of the set.
25 * Discussion of implementation details can be found in uint_set.c.
27 typedef struct uint_range_st {
31 typedef struct uint_set_item_st UINT_SET_ITEM;
32 struct uint_set_item_st {
33 OSSL_LIST_MEMBER(uint_set, UINT_SET_ITEM);
37 DEFINE_LIST_OF(uint_set, UINT_SET_ITEM);
39 typedef OSSL_LIST(uint_set) UINT_SET;
41 void ossl_uint_set_init(UINT_SET *s);
42 void ossl_uint_set_destroy(UINT_SET *s);
45 * Insert a range into a integer set. Returns 0 on allocation failure, in which
46 * case the integer set is in a valid but undefined state. Otherwise, returns 1.
47 * Ranges can overlap existing ranges without limitation. If a range is a subset
48 * of an existing range in the set, this is a no-op and returns 1.
50 int ossl_uint_set_insert(UINT_SET *s, const UINT_RANGE *range);
53 * Remove a range from the set. Returns 0 on allocation failure, in which case
54 * the integer set is unchanged. Otherwise, returns 1. Ranges which are not
55 * already in the set can be removed without issue. If a passed range is not in
56 * the integer set at all, this is a no-op and returns 1.
58 int ossl_uint_set_remove(UINT_SET *s, const UINT_RANGE *range);
60 /* Returns 1 iff the given integer is in the integer set. */
61 int ossl_uint_set_query(const UINT_SET *s, uint64_t v);