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1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.h,v 1.3 2001/07/26 21:41:21 dtashley Exp $ */
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3     //--------------------------------------------------------------------------------
4     //Copyright 2001 David T. Ashley
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681     //Public License instead of this License. But first, please read
682     //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
683     //-------------------------------------------------------------------------------------------------
684     //--------------------------------------------------------------------------------
685     //This software module is concerned with functions to support the generation
686     //of CRCs and hash functions. CRCs and hash functions are similar in that they
687     //provide an abstraction of a large amount of data, although CRCs may have better
688     //(or different) statistical properties than hash functions. These functions
689     //are split out from any specific application for maximum reusability of the
690     //code.
691    
692     #ifndef CRCHASHFUNCS_H_INCLUDED
693     #define CRCHASHFUNCS_H_INCLUDED
694    
695     #ifdef MODULE_CRCHASHFUNCS
696     #define DECMOD_CRCHASHFUNCS
697     #else
698     #define DECMOD_CRCHASHFUNCS extern
699     #endif
700    
701     //Define the state object that holds CRC-32 intermediate results as the CRC is
702     //being formed. This is conceptually private for the caller.
703     //
704     struct CRCHASHFUNCS_Crc32StateStruct
705     {
706     unsigned crc;
707     //This is the only state for now.
708     };
709    
710     //All CRC32 functions are courtesy of Richard A. Ellingson
711     //from the Internet.
712     //
713     //Checks the CRC-32 table for integrity, returns non-zero if
714     //the table is OK, or 0 if the table is corrupted. The table
715     //is a table of constants in memory--it is not known how
716     //much protection the "const" keyword can give it, i.e. if
717     //the tools can put it in a memory segment where some kind
718     //of protection is afforded by the OS.
719     DECMOD_CRCHASHFUNCS
720     int CRCHASHFUNCS_Crc32TableCheck(void);
721    
722     //Initializes the CRC formation structure.
723     DECMOD_CRCHASHFUNCS
724     void CRCHASHFUNCS_Crc32StateStructOpen(struct CRCHASHFUNCS_Crc32StateStruct *arg);
725    
726     //Adds data to it.
727     DECMOD_CRCHASHFUNCS
728     void CRCHASHFUNCS_Crc32StateStructAddData(struct CRCHASHFUNCS_Crc32StateStruct *arg,
729     void *data,
730     unsigned len);
731    
732     //Reads the CRC out at any time.
733     DECMOD_CRCHASHFUNCS
734     unsigned CRCHASHFUNCS_Crc32Extract(struct CRCHASHFUNCS_Crc32StateStruct *arg);
735    
736     //Closes the structure.
737     DECMOD_CRCHASHFUNCS
738     void CRCHASHFUNCS_Crc32StateStructClose(struct CRCHASHFUNCS_Crc32StateStruct *arg);
739    
740     DECMOD_CRCHASHFUNCS const char *CRCHASHFUNCS_cvcinfo(void);
741     DECMOD_CRCHASHFUNCS const char *CRCHASHFUNCS_hvcinfo(void);
742    
743     //Definition of the version of the H file, used for providing version control
744     //information to external callers.
745     #define CRCHASHFUNCS_H_VERSION ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.h,v 1.3 2001/07/26 21:41:21 dtashley Exp $")
746     #endif
747    
748     // $Log: crchashfuncs.h,v $
749     // Revision 1.3 2001/07/26 21:41:21 dtashley
750     // Completion of CRC32 utility, and the CRCHASHFUNCS module.
751     //
752     // Revision 1.2 2001/07/26 05:01:49 dtashley
753     // Keyword expansion corrected.
754     //
755     // End of CRCHASHFUNCS.H.

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