/*- * BSD LICENSE * * Copyright (c) Intel Corporation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "spdk/crc32.h" void spdk_crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect) { int i, j; uint32_t val; for (i = 0; i < 256; i++) { val = i; for (j = 0; j < 8; j++) { if (val & 1) { val = (val >> 1) ^ polynomial_reflect; } else { val = (val >> 1); } } table->table[i] = val; } } #ifdef SPDK_HAVE_ARM_CRC uint32_t spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) { size_t count; const uint64_t *dword_buf; count = len & 7; while (count--) { crc = __crc32b(crc, *(const uint8_t *)buf); buf++; } dword_buf = (const uint64_t *)buf; count = len / 8; while (count--) { crc = __crc32d(crc, *dword_buf); dword_buf++; } return crc; } #else uint32_t spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) { const uint8_t *buf_u8 = buf; size_t i; for (i = 0; i < len; i++) { crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff]; } return crc; } #endif