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https://github.com/aaru-dps/Aaru.Checksums.Native.git
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118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2025 Natalia Portillo.
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* Copyright 2017 The Chromium Authors. 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 are
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* 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
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* 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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#if(defined(__aarch64__) || defined(_M_ARM64) || defined(__arm__) || defined(_M_ARM)) && __ARM_ARCH >= 7
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#if !defined(__ARM_FEATURE_CRC32)
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#define __ARM_FEATURE_CRC32 1
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#endif
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#include <arm_acle.h>
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#include "library.h"
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#include "crc32.h"
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/**
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* @brief Calculates the CRC-32 using the ARMv8 instruction set in little endian mode.
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*
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* This function takes the previous CRC value, data and length as inputs and calculates
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* the new CRC-32 using the ARMv8 instruction set in little endian mode.
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*
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* @param previous_crc The previous CRC value.
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* @param data The input data to calculate the CRC over.
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* @param len The length of the input data.
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* @return The new CRC-32 value.
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*/
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TARGET_ARMV8_WITH_CRC uint32_t armv8_crc32_little(uint32_t previous_crc, const uint8_t *data, uint32_t len)
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{
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uint32_t c = previous_crc;
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#if defined(__aarch64__) || defined(_M_ARM64)
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while(len && ((uintptr_t)data & 7))
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{
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c = __crc32b(c, *data++);
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--len;
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}
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const uint64_t *buf8 = (const uint64_t *)data;
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while(len >= 64)
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{
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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c = __crc32d(c, *buf8++);
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len -= 64;
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}
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while(len >= 8)
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{
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c = __crc32d(c, *buf8++);
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len -= 8;
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}
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data = (const uint8_t *)buf8;
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#else // AARCH64
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while(len && ((uintptr_t)data & 3))
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{
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c = __crc32b(c, *data++);
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--len;
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}
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const uint32_t *buf4 = (const uint32_t *)data;
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while(len >= 32)
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{
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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c = __crc32w(c, *buf4++);
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len -= 32;
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}
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while(len >= 4)
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{
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c = __crc32w(c, *buf4++);
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len -= 4;
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}
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data = (const uint8_t *)buf4;
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#endif
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while(len--) { c = __crc32b(c, *data++); }
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return c;
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}
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#endif
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