Initial commit of current work on Prime World Editor

Common/CHashFNV1A.cpp

@@ -0,0 +1,72 @@
+#include "CHashFNV1A.h"
+
+const u64 CHashFNV1A::skFNVOffsetBasis32 = 0x811C9DC5;
+const u64 CHashFNV1A::skFNVOffsetBasis64 = 0xCBF29CE484222325;
+const u64 CHashFNV1A::skFNVPrime32 = 0x1000193;
+const u64 CHashFNV1A::skFNVPrime64 = 0x100000001B3;
+
+CHashFNV1A::CHashFNV1A()
+{
+    Init32();
+}
+
+void CHashFNV1A::Init32()
+{
+    mHashLength = e32Bit;
+    mHash = skFNVOffsetBasis32;
+}
+
+void CHashFNV1A::Init64()
+{
+    mHashLength = e64Bit;
+    mHash = skFNVOffsetBasis64;
+}
+
+void CHashFNV1A::HashData(const void *pData, u32 Size)
+{
+    const char *pCharData = (const char*) pData;
+    u64 FNVPrime = (mHashLength == e32Bit) ? skFNVPrime32 : skFNVPrime64;
+
+    for (u32 i = 0; i < Size; i++)
+    {
+        mHash ^= *pCharData;
+        mHash *= FNVPrime;
+        pCharData++;
+    }
+}
+
+u32 CHashFNV1A::GetHash32()
+{
+    return (u32) mHash;
+}
+
+u64 CHashFNV1A::GetHash64()
+{
+    return mHash;
+}
+
+// ************ CONVENIENCE FUNCTIONS ************
+void CHashFNV1A::HashByte(const u8& v)
+{
+    HashData(&v, 1);
+}
+
+void CHashFNV1A::HashShort(const u16& v)
+{
+    HashData(&v, 2);
+}
+
+void CHashFNV1A::HashLong(const u32& v)
+{
+    HashData(&v, 4);
+}
+
+void CHashFNV1A::HashFloat(const float& v)
+{
+    HashData(&v, 4);
+}
+
+void CHashFNV1A::HashString(const std::string& v)
+{
+    HashData(v.data(), v.size());
+}