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include/tl/murmur_hash.h

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+#pragma once
+
+#include "tl/detail/prologue.h"
+#include <cstdint>
+#include <cstddef>
+
+namespace tl
+{
+
+//case insensitive murmur hash. Used for case insensitive strings
+//uint32_t murmur32_ci(const void* buffer, size_t size, uint32_t seed);
+//uint32_t murmur32_ci(const char* c_str, uint32_t seed);
+
+TL_API uint32_t murmur32(const void* buffer, size_t size, uint32_t seed);
+TL_API uint64_t murmur64(const void* buffer, size_t size, uint32_t seed);
+TL_API uint64_t murmur64_seed64(const void* buffer, size_t size, uint64_t seed);
+
+TL_API uint32_t murmur32(const char* c_str, uint32_t seed);
+TL_API uint64_t murmur64(const char* c_str, uint32_t seed);
+TL_API uint32_t murmur_unaligned32(const char* c_str, uint32_t seed);
+TL_API uint64_t murmur_unaligned64(const char* c_str, uint32_t seed);
+
+TL_API uint32_t murmur_unaligned32(const void* i_buffer, size_t i_size, uint32_t i_seed);
+TL_API uint64_t murmur_unaligned64(const void* i_buffer, size_t i_size, uint64_t i_seed);
+
+//templated interface for metaprogramming
+
+//buffer + size hashing
+template<typename T> T murmur(const void* buffer, size_t size, uint32_t seed); //intentionally left without implementation to fail compilation for unsupported types
+template<> inline uint8_t murmur(const void* buffer, size_t size, uint32_t seed) { return murmur32(buffer, size, seed) & 0xff; }
+template<> inline uint16_t murmur(const void* buffer, size_t size, uint32_t seed) { return murmur32(buffer, size, seed) & 0xffff; }
+template<> inline uint32_t murmur(const void* buffer, size_t size, uint32_t seed) { return murmur32(buffer, size, seed); }
+template<> inline uint64_t murmur(const void* buffer, size_t size, uint32_t seed) { return murmur64(buffer, size, seed); }
+
+//c string hashing
+template<typename T> T murmur(const char* c_str, uint32_t seed); //intentionally left without implementation to fail compilation for unsupported types
+template<> inline uint8_t murmur(const char* c_str, uint32_t seed) { return murmur32(c_str, seed) & 0xF; }
+template<> inline uint16_t murmur(const char* c_str, uint32_t seed) { return murmur32(c_str, seed) & 0xFF; }
+template<> inline uint32_t murmur(const char* c_str, uint32_t seed) { return murmur32(c_str, seed); }
+template<> inline uint64_t murmur(const char* c_str, uint32_t seed) { return murmur64(c_str, seed); }
+
+}
+