1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>. 5 * Copyright (c) Intel Corporation. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * * Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * * Neither the name of Intel Corporation nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include "spdk/crc32.h" 36 37 void 38 spdk_crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect) 39 { 40 int i, j; 41 uint32_t val; 42 43 for (i = 0; i < 256; i++) { 44 val = i; 45 for (j = 0; j < 8; j++) { 46 if (val & 1) { 47 val = (val >> 1) ^ polynomial_reflect; 48 } else { 49 val = (val >> 1); 50 } 51 } 52 table->table[i] = val; 53 } 54 } 55 56 uint32_t 57 spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 58 { 59 const uint8_t *buf_u8 = buf; 60 size_t i; 61 62 for (i = 0; i < len; i++) { 63 crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff]; 64 } 65 66 return crc; 67 } 68