mirror of https://github.com/ARMmbed/mbed-os.git
73 lines
3.1 KiB
C
73 lines
3.1 KiB
C
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/*
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* Copyright (c) 2015-2017, Arm Limited and affiliates.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "nsconfig.h"
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#ifdef HAVE_THREAD
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#include "thread_beacon.h"
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#include "thread_config.h"
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#include "common_functions.h"
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#include "thread_meshcop_lib.h"
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#include <string.h>
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#include "ns_trace.h"
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/*service lib includes */
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#include "Service_Libs/utils/ns_crc.h"
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#define TRACE_GROUP "Tbcn"
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//#define TRACE_DEEP
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#ifdef TRACE_DEEP
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#define tr_deep tr_debug
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#else
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#define tr_deep(...)
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#endif
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uint8_t *thread_beacon_calculate_bloom_filter(uint8_t *bloom_filter_ptr, uint8_t bloom_filter_length, uint8_t *joiner_id_ptr, int joiner_id_length)
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{
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uint8_t bloom_filter_bit_length = bloom_filter_length * 8;
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//Find the CRCCCITT and CRCANSI of joiner_id
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uint16_t crc_ccitt = crc16_ccitt(joiner_id_ptr, joiner_id_length);
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uint16_t crc_ansi = crc16_ansi(joiner_id_ptr, joiner_id_length);
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// byte location is calculated from left
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uint8_t byte_location_hash1 = (bloom_filter_length - ((crc_ccitt % bloom_filter_bit_length) / 8) - 1);
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// bit location is calculated from right within a byte
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uint8_t bit_location_hash1 = ((crc_ccitt % bloom_filter_bit_length) % 8);
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uint8_t bit_hash_1 = 1 << bit_location_hash1;
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uint8_t byte_location_hash2 = (bloom_filter_length - ((crc_ansi % bloom_filter_bit_length) / 8) - 1);
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uint8_t bit_location_hash2 = ((crc_ansi % bloom_filter_bit_length) % 8);
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uint8_t bit_hash_2 = 1 << bit_location_hash2;
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bloom_filter_ptr[byte_location_hash1] = bloom_filter_ptr[byte_location_hash1] | bit_hash_1;
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bloom_filter_ptr[byte_location_hash2] = bloom_filter_ptr[byte_location_hash2] | bit_hash_2;
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return bloom_filter_ptr;
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}
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#endif
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