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8302259013
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19159)
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
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* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_UINT_SET_H
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# define OSSL_UINT_SET_H
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#include "openssl/params.h"
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/*
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* uint64_t Integer Sets
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* =====================
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*
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* Utilities for managing a logical set of unsigned 64-bit integers. The
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* structure tracks each contiguous range of integers using one allocation and
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* is thus optimised for cases where integers tend to appear consecutively.
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* Queries are optimised under the assumption that they will generally be made
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* on integers near the end of the set.
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*
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* Discussion of implementation details can be found in uint_set.c.
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*/
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typedef struct uint_range_st {
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uint64_t start, end;
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} UINT_RANGE;
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typedef struct uint_set_item_st {
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struct uint_set_item_st *prev, *next;
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UINT_RANGE range;
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} UINT_SET_ITEM;
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typedef struct uint_set_st {
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UINT_SET_ITEM *head, *tail;
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/* Number of ranges (not integers) in the set. */
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size_t num_ranges;
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} UINT_SET;
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void ossl_uint_set_init(UINT_SET *s);
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void ossl_uint_set_destroy(UINT_SET *s);
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/*
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* Insert a range into a integer set. Returns 0 on allocation failure, in which
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* case the integer set is in a valid but undefined state. Otherwise, returns 1.
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* Ranges can overlap existing ranges without limitation. If a range is a subset
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* of an existing range in the set, this is a no-op and returns 1.
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*/
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int ossl_uint_set_insert(UINT_SET *s, const UINT_RANGE *range);
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/*
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* Remove a range from the set. Returns 0 on allocation failure, in which case
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* the integer set is unchanged. Otherwise, returns 1. Ranges which are not
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* already in the set can be removed without issue. If a passed range is not in
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* the integer set at all, this is a no-op and returns 1.
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*/
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int ossl_uint_set_remove(UINT_SET *s, const UINT_RANGE *range);
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/* Returns 1 iff the given integer is in the integer set. */
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int ossl_uint_set_query(const UINT_SET *s, uint64_t v);
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#endif
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