Mercurial > hg > nginx
changeset 3891:203eb026ec07
ngx_murmur_hash2()
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 15 Apr 2011 10:59:24 +0000 |
| parents | 53e93bd521ff |
| children | 12d8d2f30205 |
| files | auto/sources src/core/ngx_core.h src/core/ngx_murmurhash.c src/core/ngx_murmurhash.h |
| diffstat | 4 files changed, 71 insertions(+), 0 deletions(-) [+] |
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--- a/auto/sources +++ b/auto/sources @@ -22,6 +22,7 @@ CORE_DEPS="src/core/nginx.h \ src/core/ngx_file.h \ src/core/ngx_crc.h \ src/core/ngx_crc32.h \ + src/core/ngx_murmurhash.h \ src/core/ngx_md5.h \ src/core/ngx_sha1.h \ src/core/ngx_rbtree.h \ @@ -50,6 +51,7 @@ CORE_SRCS="src/core/nginx.c \ src/core/ngx_inet.c \ src/core/ngx_file.c \ src/core/ngx_crc32.c \ + src/core/ngx_murmurhash.c \ src/core/ngx_rbtree.c \ src/core/ngx_radix_tree.c \ src/core/ngx_slab.c \
--- a/src/core/ngx_core.h +++ b/src/core/ngx_core.h @@ -58,6 +58,7 @@ typedef void (*ngx_connection_handler_pt #include <ngx_file.h> #include <ngx_crc.h> #include <ngx_crc32.h> +#include <ngx_murmurhash.h> #if (NGX_PCRE) #include <ngx_regex.h> #endif
new file mode 100644 --- /dev/null +++ b/src/core/ngx_murmurhash.c @@ -0,0 +1,50 @@ + +/* + * Copyright (C) Austin Appleby + */ + + +#include <ngx_config.h> +#include <ngx_core.h> + + +uint32_t +ngx_murmur_hash2(u_char *data, size_t len) +{ + uint32_t h, k; + + h = 0 ^ len; + + while (len >= 4) { + k = data[0]; + k |= data[1] << 8; + k |= data[2] << 16; + k |= data[3] << 24; + + k *= 0x5bd1e995; + k ^= k >> 24; + k *= 0x5bd1e995; + + h *= 0x5bd1e995; + h ^= k; + + data += 4; + len -= 4; + } + + switch (len) { + case 3: + h ^= data[2] << 16; + case 2: + h ^= data[1] << 8; + case 1: + h ^= data[0]; + h *= 0x5bd1e995; + } + + h ^= h >> 13; + h *= 0x5bd1e995; + h ^= h >> 15; + + return h; +}
new file mode 100644 --- /dev/null +++ b/src/core/ngx_murmurhash.h @@ -0,0 +1,18 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#ifndef _NGX_MURMURHASH_H_INCLUDED_ +#define _NGX_MURMURHASH_H_INCLUDED_ + + +#include <ngx_config.h> +#include <ngx_core.h> + + +uint32_t ngx_murmur_hash2(u_char *data, size_t len); + + +#endif /* _NGX_CRC_H_INCLUDED_ */