d29384bf97
Change-Id: I28f3f4723a66f845eb478a6873d7aedb8f5409b8 Signed-off-by: Ben Walker <benjamin.walker@intel.com>
137 lines
3.6 KiB
C
137 lines
3.6 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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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
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* are met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <inttypes.h>
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#include <stdint.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/uio.h>
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#include "iscsi/iscsi.h"
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#include "iscsi/crc32c.h"
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#ifndef USE_ISAL
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#define SPDK_USE_CRC32C_TABLE
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#endif
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#ifdef SPDK_USE_CRC32C_TABLE
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static uint32_t spdk_crc32c_table[256];
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__attribute__((constructor)) static void
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spdk_init_crc32c(void)
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{
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int i, j;
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uint32_t val;
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for (i = 0; i < 256; i++) {
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val = i;
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for (j = 0; j < 8; j++) {
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if (val & 1) {
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val = (val >> 1) ^ SPDK_CRC32C_POLYNOMIAL_REFLECT;
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} else {
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val = (val >> 1);
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}
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}
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spdk_crc32c_table[i] = val;
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}
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}
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#endif /* SPDK_USE_CRC32C_TABLE */
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#ifndef USE_ISAL
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uint32_t
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spdk_update_crc32c(const uint8_t *buf, size_t len, uint32_t crc)
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{
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size_t s;
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#ifndef SPDK_USE_CRC32C_TABLE
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int i;
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uint32_t val;
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#endif /* SPDK_USE_CRC32C_TABLE */
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for (s = 0; s < len; s++) {
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#ifdef SPDK_USE_CRC32C_TABLE
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crc = (crc >> 8) ^ spdk_crc32c_table[(crc ^ buf[s]) & 0xff];
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#else
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val = buf[s];
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for (i = 0; i < 8; i++) {
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if ((crc ^ val) & 1) {
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crc = (crc >> 1) ^ SPDK_CRC32C_POLYNOMIAL_REFLECT;
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} else {
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crc = (crc >> 1);
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}
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val = val >> 1;
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}
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#endif /* SPDK_USE_CRC32C_TABLE */
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}
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return crc;
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}
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#endif /* USE_ISAL */
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uint32_t
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spdk_fixup_crc32c(size_t total, uint32_t crc)
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{
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uint8_t padding[ISCSI_ALIGNMENT];
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size_t pad_length;
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size_t rest;
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if (total == 0)
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return crc;
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rest = total % ISCSI_ALIGNMENT;
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if (rest != 0) {
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pad_length = ISCSI_ALIGNMENT;
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pad_length -= rest;
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if (pad_length > 0 && pad_length < sizeof padding) {
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memset(padding, 0, sizeof padding);
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crc = spdk_update_crc32c(padding, pad_length, crc);
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}
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}
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return crc;
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}
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uint32_t
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spdk_crc32c(const uint8_t *buf, size_t len)
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{
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uint32_t crc32c;
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crc32c = SPDK_CRC32C_INITIAL;
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crc32c = spdk_update_crc32c(buf, len, crc32c);
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if ((len % ISCSI_ALIGNMENT) != 0) {
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crc32c = spdk_fixup_crc32c(len, crc32c);
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}
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crc32c = crc32c ^ SPDK_CRC32C_XOR;
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return crc32c;
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}
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