diff options
Diffstat (limited to 'libs/libcurl/src/uint-bset.h')
-rw-r--r-- | libs/libcurl/src/uint-bset.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/libs/libcurl/src/uint-bset.h b/libs/libcurl/src/uint-bset.h new file mode 100644 index 0000000000..7eab4f44bf --- /dev/null +++ b/libs/libcurl/src/uint-bset.h @@ -0,0 +1,114 @@ +#ifndef HEADER_CURL_UINT_BSET_H
+#define HEADER_CURL_UINT_BSET_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+#include <curl/curl.h>
+
+/* A bitset for unsigned int values.
+ * It can hold the numbers from 0 - (nmax - 1),
+ * rounded to the next 64 multiple.
+ *
+ * Optimized for high efficiency in adding/removing numbers.
+ * Efficient storage when the set is (often) relatively full.
+ *
+ * If the set's cardinality is only expected to be a fraction of nmax,
+ * uint_spbset offers a "sparse" variant with more memory efficiency at
+ * the price of slightly slower operations.
+ */
+
+struct uint_bset {
+ curl_uint64_t *slots;
+ unsigned int nslots;
+#ifdef DEBUGBUILD
+ int init;
+#endif
+};
+
+/* Initialize the bitset with capacity 0. */
+void Curl_uint_bset_init(struct uint_bset *bset);
+
+/* Resize the bitset capacity to hold numbers from 0 to `nmax`,
+ * which rounds up `nmax` to the next multiple of 64. */
+CURLcode Curl_uint_bset_resize(struct uint_bset *bset, unsigned int nmax);
+
+/* Destroy the bitset, freeing all resources. */
+void Curl_uint_bset_destroy(struct uint_bset *bset);
+
+/* Get the bitset capacity, e.g. can hold numbers from 0 to capacity - 1. */
+unsigned int Curl_uint_bset_capacity(struct uint_bset *bset);
+
+/* Get the cardinality of the bitset, e.g. numbers present in the set. */
+unsigned int Curl_uint_bset_count(struct uint_bset *bset);
+
+/* TRUE of bitset is empty */
+bool Curl_uint_bset_empty(struct uint_bset *bset);
+
+/* Clear the bitset, making it empty. */
+void Curl_uint_bset_clear(struct uint_bset *bset);
+
+/* Add the number `i` to the bitset. Return FALSE if the number is
+ * outside the set's capacity.
+ * Numbers can be added more than once, without making a difference. */
+bool Curl_uint_bset_add(struct uint_bset *bset, unsigned int i);
+
+/* Remove the number `i` from the bitset. */
+void Curl_uint_bset_remove(struct uint_bset *bset, unsigned int i);
+
+/* Return TRUE if the bitset contains number `i`. */
+bool Curl_uint_bset_contains(struct uint_bset *bset, unsigned int i);
+
+/* Get the first number in the bitset, e.g. the smallest.
+ * Returns FALSE when the bitset is empty. */
+bool Curl_uint_bset_first(struct uint_bset *bset, unsigned int *pfirst);
+
+/* Get the next number in the bitset, following `last` in natural order.
+ * Put another way, this is the smallest number greater than `last` in
+ * the bitset. `last` does not have to be present in the set.
+ *
+ * Returns FALSE when no such number is in the set.
+ *
+ * This allows to iterate the set while being modified:
+ * - added numbers higher than 'last' will be picked up by the iteration.
+ * - added numbers lower than 'last' will not show up.
+ * - removed numbers lower or equal to 'last' will not show up.
+ * - removed numbers higher than 'last' will not be visited. */
+bool Curl_uint_bset_next(struct uint_bset *bset, unsigned int last,
+ unsigned int *pnext);
+
+
+#ifndef CURL_POPCOUNT64
+#define CURL_POPCOUNT64(x) Curl_popcount64(x)
+#define CURL_POPCOUNT64_IMPLEMENT
+unsigned int Curl_popcount64(curl_uint64_t x);
+#endif /* !CURL_POPCOUNT64 */
+
+#ifndef CURL_CTZ64
+#define CURL_CTZ64(x) Curl_ctz64(x)
+#define CURL_CTZ64_IMPLEMENT
+unsigned int Curl_ctz64(curl_uint64_t x);
+#endif /* !CURL_CTZ64 */
+
+#endif /* HEADER_CURL_UINT_BSET_H */
|