view src/core/ngx_crc32.h @ 494:499474178a11 NGINX_0_7_59

nginx 0.7.59 *) Feature: the "proxy_cache_methods" and "fastcgi_cache_methods" directives. *) Bugfix: socket leak; the bug had appeared in 0.7.25. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault occurred in worker process, if a request had no body and the $request_body variable was used; the bug had appeared in 0.7.58. *) Bugfix: the SSL modules might not built on Solaris and Linux; the bug had appeared in 0.7.58. *) Bugfix: ngx_http_xslt_filter_module responses were not handled by SSI, charset, and gzip filters. *) Bugfix: a "charset" directive did not set a charset to ngx_http_gzip_static_module responses.
author Igor Sysoev <http://sysoev.ru>
date Mon, 25 May 2009 00:00:00 +0400
parents b743d290eb3b
children d0f7a625f27c
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


#ifndef _NGX_CRC32_H_INCLUDED_
#define _NGX_CRC32_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


extern uint32_t  *ngx_crc32_table_short;
extern uint32_t   ngx_crc32_table256[];


static ngx_inline uint32_t
ngx_crc32_short(u_char *p, size_t len)
{
    u_char    c;
    uint32_t  crc;

    crc = 0xffffffff;

    while (len--) {
        c = *p++;
        crc = ngx_crc32_table_short[(crc ^ (c & 0xf)) & 0xf] ^ (crc >> 4);
        crc = ngx_crc32_table_short[(crc ^ (c >> 4)) & 0xf] ^ (crc >> 4);
    }

    return crc ^ 0xffffffff;
}


static ngx_inline uint32_t
ngx_crc32_long(u_char *p, size_t len)
{
    uint32_t  crc;

    crc = 0xffffffff;

    while (len--) {
        crc = ngx_crc32_table256[(crc ^ *p++) & 0xff] ^ (crc >> 8);
    }

    return crc ^ 0xffffffff;
}


#define ngx_crc32_init(crc)                                                   \
    crc = 0xffffffff


static ngx_inline void
ngx_crc32_update(uint32_t *crc, u_char *p, size_t len)
{
    uint32_t  c;

    c = *crc;

    while (len--) {
        c = ngx_crc32_table256[(c ^ *p++) & 0xff] ^ (c >> 8);
    }

    *crc = c;
}


#define ngx_crc32_final(crc)                                                  \
    crc ^= 0xffffffff


ngx_int_t ngx_crc32_table_init(void);


#endif /* _NGX_CRC32_H_INCLUDED_ */