nginx-0.0.1-2003-11-30-23:03:18 import
diff --git a/src/core/ngx_crc.h b/src/core/ngx_crc.h
new file mode 100644
index 0000000..df64889
--- /dev/null
+++ b/src/core/ngx_crc.h
@@ -0,0 +1,26 @@
+#ifndef _NGX_CRC_H_INCLUDED_
+#define _NGX_CRC_H_INCLUDED_
+
+
+/* 32-bit crc16 */
+
+ngx_inline static uint32_t ngx_crc(char *data, size_t len)
+{
+ uint32_t sum;
+
+ for (sum = 0; len; len--) {
+ /*
+ * gcc 2.95.2 x86 and icc 7.1.006 compile that operator
+ * into the single rol opcode.
+ * msvc 6.0sp2 compiles it into four opcodes.
+ */
+ sum = sum >> 1 | sum << 31;
+
+ sum += *data++;
+ }
+
+ return sum;
+}
+
+
+#endif /* _NGX_CRC_H_INCLUDED_ */
