46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 1998-1999, Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
|
||
|
|
crc-32.cpp
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
#include <windows.h>
|
||
|
|
#include "crc-32.h"
|
||
|
|
|
||
|
|
|
||
|
|
DWORD CRC_32(LPBYTE pb, DWORD cb)
|
||
|
|
{
|
||
|
|
|
||
|
|
// CRC-32 algorithm used in PKZip, AUTODIN II, Ethernet, and FDDI
|
||
|
|
// but xor out (xorot) has been changed from 0xFFFFFFFF to 0 so
|
||
|
|
// we can store the CRC at the end of the block and expect 0 to be
|
||
|
|
// the value of the CRC of the resulting block (including the stored
|
||
|
|
// CRC).
|
||
|
|
|
||
|
|
cm_t cmt = {
|
||
|
|
32, // cm_width Parameter: Width in bits [8,32].
|
||
|
|
0x04C11DB7, // cm_poly Parameter: The algorithm's polynomial.
|
||
|
|
0xFFFFFFFF, // cm_init Parameter: Initial register value.
|
||
|
|
TRUE, // cm_refin Parameter: Reflect input bytes?
|
||
|
|
TRUE, // cm_refot Parameter: Reflect output CRC?
|
||
|
|
0, // cm_xorot Parameter: XOR this to output CRC.
|
||
|
|
0 // cm_reg Context: Context during execution.
|
||
|
|
};
|
||
|
|
|
||
|
|
// Documented test case for CRC-32:
|
||
|
|
// Checking "123456789" should return 0xCBF43926
|
||
|
|
|
||
|
|
cm_ini(&cmt);
|
||
|
|
cm_blk(&cmt, pb, cb);
|
||
|
|
|
||
|
|
return cm_crc(&cmt);
|
||
|
|
}
|
||
|
|
|