File: PMurHash.h

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libmurmurhash 1.3-2
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/*-----------------------------------------------------------------------------
 * MurmurHash3 was written by Austin Appleby, and is placed in the public
 * domain.
 *
 * This implementation was written by Shane Day, and is also public domain.
 *
 * This is a portable ANSI C implementation of MurmurHash3_x86_32 (Murmur3A)
 * with support for progressive processing.
 */

/* ------------------------------------------------------------------------- */
/* Determine what native type to use for uint32_t */

/* We can't use the name 'uint32_t' here because it will conflict with
 * any version provided by the system headers or application. */

/* First look for special cases */
#if defined(_MSC_VER)
#define MH_UINT32 unsigned long
#endif

/* If the compiler says it's C99 then take its word for it */
#if !defined(MH_UINT32) &&                                                     \
	(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
#include <stdint.h>
#define MH_UINT32 uint32_t
#endif

/* Otherwise try testing against max value macros from limit.h */
#if !defined(MH_UINT32)
#include <limits.h>
#if (USHRT_MAX == 0xffffffffUL)
#define MH_UINT32 unsigned short
#elif (UINT_MAX == 0xffffffffUL)
#define MH_UINT32 unsigned int
#elif (ULONG_MAX == 0xffffffffUL)
#define MH_UINT32 unsigned long
#endif
#endif

#if !defined(MH_UINT32)
#error Unable to determine type name for unsigned 32-bit int
#endif

/* I'm yet to work on a platform where 'unsigned char' is not 8 bits */
#define MH_UINT8 unsigned char

/* ------------------------------------------------------------------------- */
/* Prototypes */

#ifdef __cplusplus
extern "C" {
#endif

void PMurHash32_Process(MH_UINT32 *ph1, MH_UINT32 *pcarry, const void *key,
						int len);
MH_UINT32 PMurHash32_Result(MH_UINT32 h1, MH_UINT32 carry,
							MH_UINT32 total_length);
MH_UINT32 PMurHash32(MH_UINT32 seed, const void *key, int len);

void PMurHash32_test(const void *key, int len, MH_UINT32 seed, void *out);

#ifdef __cplusplus
}
#endif