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diff src/core/ngx_crc32.h @ 250:fbf2b2f66c9f NGINX_0_4_10

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nginx 0.4.10 *) Feature: the POP3 proxy supports the APOP command. *) Bugfix: if the select, poll or /dev/poll methods were used, then while waiting authentication server response the IMAP/POP3 proxy hogged CPU. *) Bugfix: a segmentation fault might occur if the $server_addr variable was used in the "map" directive. *) Bugfix: the ngx_http_flv_module did not support the byte ranges for full responses; bug appeared in 0.4.7. *) Bugfix: nginx could not be built on Debian amd64; bug appeared in 0.4.9.
author Igor Sysoev <http://sysoev.ru>
date Mon, 23 Oct 2006 00:00:00 +0400
parents
children 6eb1e38f0f1f
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new file mode 100644
--- /dev/null
+++ b/src/core/ngx_crc32.h
@@ -0,0 +1,55 @@
+
+/*
+ * 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;
+}
+
+
+ngx_int_t ngx_crc32_init(ngx_pool_t *pool);
+
+
+#endif /* _NGX_CRC32_H_INCLUDED_ */