Leaked source code of windows server 2003
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/*
* $Header: /entproj/all/base/etfile/crcutil.h_v 1.3 Wed Dec 07 15:05:30 1994 markbc $ * $Log: /entproj/all/base/etfile/crcutil.h_v $ * * Rev 1.3 Wed Dec 07 15:05:30 1994 markbc * Alpha port checkin * * Rev 1.2 19 Oct 1994 15:44:08 chucker * Synced up headers with the code. * * Rev 1.1 18 Aug 1994 11:33:46 dilkie * Protected INIFILE stuff * * Rev 1.0 11 Aug 1994 17:22:46 JackK * Initial file check in */
/***********************************************************************
* Prototypes and typedefs for the CRC utility routines.** Author: Gary P. Mussar* This code is released to the public domain. There are no restrictions,* however, acknowledging the author by keeping this comment around* would be appreciated.***********************************************************************/
//#include <os_spec.h>
/***********************************************************************
* If we can handle ANSI prototyping, lets do it.***********************************************************************///#ifdef __cplusplus
//extern "C" { /* Assume C declarations for C++ */
//#endif /* __cplusplus */
//#ifdef NEEDPROTOS
#define PARMS(x) x
//#else
//#define PARMS(x) ()
//#endif
/***********************************************************************
* The following #defines are used to define the types of variables* used to hold or manipulate CRCs. The 16 bit CRCs require a data* type with at least 16 bits. The 32 bit CRCs require a data type* with at least 32 bits. In addition, the data bits reserved for the* CRC must be manipulated in an unsigned fashion. It is possible to* define a data type which is larger than required to hold the CRC,* however, this is an inefficient use of memory and usually results* in less efficient code when manipulating the CRCs.***********************************************************************/
#define CRC16 unsigned short int
#define CRC32 UINT32
/***********************************************************************
* Utilities for fast CRC using table lookup** I_CRCxx - Initialize the 256 entry CRC lookup table based on the* specified generator polynomial.* Input:* Table[256] - Lookup table* *GenPolynomial - Pointer to generator polynomial** F_CRCxx - Calculate CRC over an array of characters using fast* table lookup.* Input:* Table[256] - Lookup table* *CRC - Pointer to the variable containing the result of* CRC calculations of previous characters. The CRC* variable must be initialized to a known value* before the first call to this routine.* *dataptr - Pointer to array of characters to be included in* the CRC calculation.* count - Number of characters in the array.** S_CRCxx - Calculate CRC over an array of characters using slower but* smaller non-table lookup method.* Input:* *GenPolynomial - Pointer to generator polynomial* *CRC - Pointer to the variable containing the result of* CRC calculations of previous characters. The CRC* variable must be initialized to a known value* before the first call to this routine.* *dataptr - Pointer to array of characters to be included in* the CRC calculation.* count - Number of characters in the array.***********************************************************************/extern void I_CRC16 PARMS((CRC16 Table[256], \ CRC16 *GenPolynomial));
extern void F_CRC16 PARMS((CRC16 Table[256], \ CRC16 *CRC, \ const void *dataptr, \ unsigned int count));
extern void S_CRC16 PARMS((CRC16 *GenPolynomial, \ CRC16 *CRC, \ const void *dataptr, \ unsigned int count));
extern void I_CRC32 PARMS((CRC32 Table[256], \ CRC32 *GenPolynomial));
extern void F_CRC32 PARMS((CRC32 Table[256], \ CRC32 *CRC, \ const void *dataptr, \ unsigned int count));
extern void S_CRC32 PARMS((CRC32 *GenPolynomial, \ CRC32 *CRC, \ const void *dataptr, \ unsigned int count));//#ifdef __cplusplus
//} /* Assume C declarations for C++ */
//#endif /* __cplusplus */
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