55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright (c) 2022, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <arm_acle.h>
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#define CRC_LOOP(op, crc, type, buf, len) \
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while ((len) >= sizeof(type)) { \
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(crc) = op((crc), *(type *)(buf)); \
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(len) -= sizeof(type); \
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buf += sizeof(type); \
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}
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#define CRC_SINGLE(op, crc, type, buf, len) \
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if ((len) >= sizeof(type)) { \
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(crc) = op((crc), *(type *)(buf)); \
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(len) -= sizeof(type); \
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buf += sizeof(type); \
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}
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/* Return 32-bit CRC for the input buffer.
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* Polynomial is 0x1EDC6F41.
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*/
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uint32_t av1_get_crc32c_value_arm_crc32(void *crc_calculator, uint8_t *p,
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size_t len) {
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(void)crc_calculator;
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const uint8_t *buf = p;
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uint32_t crc = 0xFFFFFFFF;
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#if !defined(__aarch64__)
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// Align input to 8-byte boundary (only necessary for 32-bit builds.)
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while (len && ((uintptr_t)buf & 7)) {
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crc = __crc32cb(crc, *buf++);
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len--;
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}
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#endif
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CRC_LOOP(__crc32cd, crc, uint64_t, buf, len)
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CRC_SINGLE(__crc32cw, crc, uint32_t, buf, len)
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CRC_SINGLE(__crc32ch, crc, uint16_t, buf, len)
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CRC_SINGLE(__crc32cb, crc, uint8_t, buf, len)
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return ~crc;
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}
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