mirror of
https://github.com/blawar/GLideN64.git
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71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
// Copyright (c) 2017-Present Stefan Eschenbacher. All rights reserved.
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//
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// This ARMv8 CRC32 code, is dual-licensed under GNU General Public License
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// version 2 ("GPL") and the Apache License version 2 ("ASL"). For the GPL,
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// please see LICENSE. For the ASL, you may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
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// either express or implied. See the LICENSE file for specific language governing
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// rights and limitations of this software.
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#include "CRC.h"
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#include <arm_acle.h>
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void CRC_Init()
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{
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}
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u64 CRC_Calculate( u64 crc, const void * buffer, u32 count )
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{
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u8 *p;
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u32 crc32 = static_cast<u32>(crc);
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u32 orig = crc32;
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p = (u8*) buffer;
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// use eight byte crc intrinsic __crc32d if count is high enough.
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// __crc32d, __crc32w, __crc32h and __crc32b use polynomial 0x04C11DB7
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while (count >= 8) {
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crc32 = __crc32d(crc32, *((u64*)p));
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p += 8;
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count -= 8;
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}
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if (count >= 4) {
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crc32 = __crc32w(crc32, *((u32*)p));
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p += 4;
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count -= 4;
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}
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if (count >= 2) {
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crc32 = __crc32h(crc32, *((u16*)p));
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p += 2;
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count -= 2;
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}
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if (count == 1)
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crc32 = __crc32b(crc32, *p);
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return crc32 ^ orig;
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}
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u32 CRC_Calculate_Strict( u32 crc, const void * buffer, u32 count )
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{
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return CRC_Calculate(crc, buffer, count);
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}
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u64 CRC_CalculatePalette(u64 crc, const void * buffer, u32 count )
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{
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u8 *p;
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u32 crc32 = static_cast<u32>(crc);
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u32 orig = crc32;
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p = (u8*) buffer;
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while (count--) {
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// use two byte intrinsic __crc32h
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crc32 = __crc32h(crc32, *((u16*)p));
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p += 8;
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}
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return crc32 ^ orig;
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}
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