mirror of
https://github.com/blawar/GLideN64.git
synced 2024-07-02 09:03:37 +00:00
57 lines
980 B
C++
57 lines
980 B
C++
#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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u32 CRC_Calculate( u32 crc, const void * buffer, u32 count )
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{
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u8 *p;
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u32 orig = crc;
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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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crc = __crc32d(crc, *((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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crc = __crc32w(crc, *((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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crc = __crc32h(crc, *((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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crc = __crc32b(crc, *p);
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return crc ^ 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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u32 CRC_CalculatePalette(u32 crc, const void * buffer, u32 count )
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{
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u8 *p;
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u32 orig = crc;
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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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crc = __crc32h(crc, *((u16*)p));
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p += 8;
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}
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return crc ^ orig;
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}
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