// vim:fileencoding=utf-8:foldmethod=marker

#ifndef HASHER_H
#define HASHER_H

#include "../../stream/stream.h"
#include "../../../common/aliases/aliases.h"

#ifdef WP_PLATFORM_CPP
BEGIN_C_LINKAGE
#endif // !WP_PLATFORM_CPP

typedef struct WpU128 {
	u64 value[2];
} WpU128;

typedef enum WpHasherCtxType {
	WP_HASHER_CTX_MURMUR3,
	WP_HASHER_CTX_SIPHASH,
	WP_HASHER_CTX_USER_DEFINED,

	COUNT_HASHER_CTX,
} WpHasherCtxType;

typedef struct WpSiphashCtx {
	WpU128 key;
	u64    compression;
	u64    finalisation;
} WpSiphashCtx;

typedef struct WpHasherCtx {
	WpHasherCtxType type;
	union {
		WpSiphashCtx siphash;
		void        *user;
		u32          murmur3;
	};
} WpHasherCtx;

typedef WpU128 (*WpHashFunc)(WpU8Stream *stream, WpHasherCtx ctx);

typedef struct WpHasher {
	WpHashFunc  func;
	WpHasherCtx ctx;
} WpHasher;

WpHasher wpCustomHasher(WpHashFunc func, void *ctx);
WpU128   wpHasherGetHash128(const WpHasher *hasher, WpU8Stream *stream);
u64      wpHasherGetHash64(const WpHasher *hasher, WpU8Stream *stream);

#ifdef WP_PLATFORM_CPP
END_C_LINKAGE
#endif // !WP_PLATFORM_CPP

#endif // !HASHER_H