hash(9) - NetBSD Manual Pages

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HASH(9)                NetBSD Kernel Developer's Manual                HASH(9)


NAME
hash, hash32_buf, hash32_str, hash32_strn -- kernel hash functions
SYNOPSIS
#include <sys/types.h> #include <sys/hash.h> uint32_t hash32_buf(const void *buf, size_t len, uint32_t ihash); uint32_t hash32_str(const void *buf, uint32_t ihash); uint32_t hash32_strn(const void *buf, size_t len, uint32_t ihash);
DESCRIPTION
The hash functions returns a hash of the given buffer. The hash32_buf() function returns a 32 bit hash of buf, which is len bytes long, seeded with an initial hash of ihash (which is usually HASH32_BUF_INIT). This function may use a different algorithm to hash32_str() and hash32_strn(). The hash32_str() function returns a 32 bit hash of buf, which is a NUL terminated ASCII string, seeded with an initial hash of ihash (which is usually HASH32_STR_INIT). This function must use the same algorithm as hash32_strn(), so that the same data returns the same hash. The hash32_strn() function returns a 32 bit hash of buf, which is a NUL terminated ASCII string, up to a maximum of len bytes, seeded with an initial hash of ihash (which is usually HASH32_STR_INIT). This function must use the same algorithm as hash32_str(), so that the same data returns the same hash. The ihash parameter is provided to allow for incremental hashing by allowing successive calls to use a previous hash value.
RETURN VALUES
The hash32_* functions return a 32 bit hash of the provided buffer.
HISTORY
The kernel hashing API first appeared in NetBSD 1.6. NetBSD 9.99 December 5, 2001 NetBSD 9.99
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Modified for NetBSD by Kimmo Suominen