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/crc16.h" 35 36 uint16_t 37 spdk_crc16_t10dif(uint16_t init_crc, const void *buf, size_t len) 38 { 39 uint32_t j, rem; 40 const uint8_t *data = (const uint8_t *)buf; 41 size_t i; 42 43 uint16_t poly = SPDK_T10DIF_CRC16_POLYNOMIAL; 44 45 rem = init_crc; 46 47 for (i = 0; i < len; i++) { 48 rem = rem ^ (data[i] << 8); 49 for (j = 0; j < 8; j++) { 50 rem = rem << 1; 51 rem = (rem & 0x10000) ? rem ^ poly : rem; 52 } 53 } 54 return (uint16_t)rem; 55 } 56 57 uint16_t 58 spdk_crc16_t10dif_copy(uint16_t init_crc, uint8_t *dst, uint8_t *src, 59 size_t len) 60 { 61 uint32_t j, rem; 62 size_t i; 63 64 uint16_t poly = SPDK_T10DIF_CRC16_POLYNOMIAL; 65 66 rem = init_crc; 67 68 for (i = 0; i < len; i++) { 69 rem = rem ^ (src[i] << 8); 70 dst[i] = src[i]; 71 for (j = 0; j < 8; j++) { 72 rem = rem << 1; 73 rem = (rem & 0x10000) ? rem ^ poly : rem; 74 } 75 } 76 return (uint16_t)rem; 77 } 78