73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
#include "CHashFNV1A.h"
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const u64 CHashFNV1A::skFNVOffsetBasis32 = 0x811C9DC5;
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const u64 CHashFNV1A::skFNVOffsetBasis64 = 0xCBF29CE484222325;
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const u64 CHashFNV1A::skFNVPrime32 = 0x1000193;
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const u64 CHashFNV1A::skFNVPrime64 = 0x100000001B3;
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CHashFNV1A::CHashFNV1A()
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{
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Init32();
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}
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void CHashFNV1A::Init32()
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{
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mHashLength = e32Bit;
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mHash = skFNVOffsetBasis32;
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}
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void CHashFNV1A::Init64()
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{
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mHashLength = e64Bit;
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mHash = skFNVOffsetBasis64;
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}
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void CHashFNV1A::HashData(const void *pData, u32 Size)
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{
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const char *pCharData = (const char*) pData;
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u64 FNVPrime = (mHashLength == e32Bit) ? skFNVPrime32 : skFNVPrime64;
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for (u32 i = 0; i < Size; i++)
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{
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mHash ^= *pCharData;
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mHash *= FNVPrime;
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pCharData++;
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}
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}
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u32 CHashFNV1A::GetHash32()
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{
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return (u32) mHash;
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}
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u64 CHashFNV1A::GetHash64()
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{
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return mHash;
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}
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// ************ CONVENIENCE FUNCTIONS ************
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void CHashFNV1A::HashByte(const u8& v)
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{
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HashData(&v, 1);
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}
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void CHashFNV1A::HashShort(const u16& v)
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{
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HashData(&v, 2);
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}
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void CHashFNV1A::HashLong(const u32& v)
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{
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HashData(&v, 4);
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}
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void CHashFNV1A::HashFloat(const float& v)
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{
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HashData(&v, 4);
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}
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void CHashFNV1A::HashString(const std::string& v)
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{
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HashData(v.data(), v.size());
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}
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