         <<< MOVIES::DISK$SYSDATA:[NOTES$LIBRARY]DOLLAR_INFO.NOTE;1 >>>
                      -< Dollar File System Information >-
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Note 86.6                Additional Product Requirements                  6 of 8
LEDER1::PETTENGILL "mulp"                            51 lines  30-APR-1994 03:30
     -< ctm_ssi_checksum.h: code written by Stefano Santoro while in CVG >-
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/*
*****************************************************************************
**                                                                           *
**  DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASSACHUSETTS.                   *
**  COPYRIGHT ©   1992                                                       *
**  ALL RIGHTS RESERVED.                                                     *
**                                                                           *
**  THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED    *
**  ONLY IN  ACCORDANCE WITH  THE  TERMS  OF  SUCH  LICENSE  AND WITH THE    *
**  INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR  ANY  OTHER    *
**  COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY    *
**  OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE  SOFTWARE IS  HEREBY    *
**  TRANSFERRED.                                                             *
**                                                                           *
**  THE INFORMATION IN THIS SOFTWARE IS  SUBJECT TO CHANGE WITHOUT NOTICE    *
**  AND  SHOULD  NOT  BE  CONSTRUED AS  A COMMITMENT BY DIGITAL EQUIPMENT    *
**  CORPORATION.                                                             *
**                                                                           *
**  DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE  OR  RELIABILITY OF ITS    *
**  SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.                  *
**                                                                           *
**                                                                           *
******************************************************************************
*/

/*
** CTM SSI Checksum data type and constant definition file.
**
** Author: Stefano Santoro
** 
*/
#ifdef CTM_SSI_CHECKSUM
#include ctype
#endif

#define CHECKSUM_MODULO	255

/* Checksum is composed of two bytes, which when computed are storred
** in the first two characters of the aggregate, these are then one
** complemented to the remaing two charecters.
*/
typedef union ChkSmAgr_Tag {
  unsigned char		ByChr[sizeof( unsigned int)];
  unsigned short	ByWrd[sizeof( unsigned short)];
  unsigned int		ByInt;
} T_ChkSmAgr, *TP_ChkSmAgr;

#ifndef CTM_SSI_CHECKSUM
extern unsigned int CmpChkSm( char *Bff, int BffSz);
extern unsigned int VldChkSm( unsigned int PrmChkSm);
#endif