1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "spdk/crc32.h" 35 36 void 37 spdk_crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect) 38 { 39 int i, j; 40 uint32_t val; 41 42 for (i = 0; i < 256; i++) { 43 val = i; 44 for (j = 0; j < 8; j++) { 45 if (val & 1) { 46 val = (val >> 1) ^ polynomial_reflect; 47 } else { 48 val = (val >> 1); 49 } 50 } 51 table->table[i] = val; 52 } 53 } 54 55 uint32_t 56 spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 57 { 58 const uint8_t *buf_u8 = buf; 59 size_t i; 60 61 for (i = 0; i < len; i++) { 62 crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff]; 63 } 64 65 return crc; 66 } 67