/[dtapublic]/projs/trunk/shared_source/c_datd/esrg_rand_int.h
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1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_rand_int.h,v 1.3 2002/05/15 21:59:22 dtashley Exp $
2     **
3     ** Provides functions related to the generation of random integers.
4     */
5    
6     //--------------------------------------------------------------------------------
7     //Copyright 2001 David T. Ashley
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686     //-------------------------------------------------------------------------------------------------
687     //--------------------------------------------------------------------------------
688     #ifndef ESRG_RAND_INT_H_INCLUDED
689     #define ESRG_RAND_INT_H_INCLUDED
690    
691     #ifdef MODULE_ESRG_RAND_INT
692     #define DECMOD_ESRG_RAND_INT
693     #else
694     #define DECMOD_ESRG_RAND_INT extern
695     #endif
696    
697     //This module is grouped as a collection of algorithms.
698     //At present, there is only one algorithm, but this may
699     //change.
700     //**************************************************************************
701     //**************************************************************************
702     //********** Algorithm 01: Power Residue 16807 **************************
703     //**************************************************************************
704     //**************************************************************************
705     //This is the state vector. This is conceptually private, and the
706     //caller should not tamper with it or peek into it.
707     struct ESRG_RAND_INT_Alg01RngState
708     {
709     unsigned rn_seed_whole;
710     //The current whole random number. This is the random
711     //number that will be served up when the first algorithm
712     //is used directly or when a random integer over a large
713     //range is required.
714     unsigned rn_seed_fractional;
715     //The current seed in use for requests for bits or
716     //small portions of bits.
717     unsigned bit_buffer;
718     //A buffer maintained to doll out bits and small random
719     //numbers. This buffer is emptied from the right.
720     unsigned n_bb_valid;
721     //The number of valid bits in the bit buffer. When there
722     //are no more valid bits, the bit buffer must be
723     //restocked.
724     };
725    
726     //Initializes the random number generation structure. If
727     //(init_val == -1), then the state will be randomized using the system
728     //clock and other system randomness. This means that the random
729     //sequence generated won't be predictable (it will vary from usage
730     //to usage of this module). If init_val is positive, the positive
731     //value will be used to initialize the state. The mapping from
732     //init_val is guaranteed to be deterministic (the same value always
733     //leads to the same sequences), but uniqueness is not guaranteed:
734     //different values of init_val may lead to the same sequences.
735     DECMOD_ESRG_RAND_INT
736     void ESRG_RAND_INT_Alg01_Init(struct ESRG_RAND_INT_Alg01RngState *state,
737     int init_val);
738    
739     //Returns a single random bit.
740     DECMOD_ESRG_RAND_INT
741     unsigned int ESRG_RAND_INT_Alg01_RandomBit(
742     struct ESRG_RAND_INT_Alg01RngState *state
743     );
744     //Returns a single random byte.
745     DECMOD_ESRG_RAND_INT
746     unsigned int ESRG_RAND_INT_Alg01_RandomByte(
747     struct ESRG_RAND_INT_Alg01RngState *state
748     );
749    
750     DECMOD_ESRG_RAND_INT const char *ESRG_RAND_INT_cvcinfo(void);
751     DECMOD_ESRG_RAND_INT const char *ESRG_RAND_INT_hvcinfo(void);
752     #define ESRG_RAND_INT_H_VERSION ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_rand_int.h,v 1.3 2002/05/15 21:59:22 dtashley Exp $")
753     #endif
754    
755     /***************************************************************************
756     ** $Log: esrg_rand_int.h,v $
757     ** Revision 1.3 2002/05/15 21:59:22 dtashley
758     ** Checkin before .ZIP'ing up source code for assistance of newsgroup
759     ** posters.
760     **
761     ** Revision 1.2 2002/05/15 11:17:37 dtashley
762     ** Edits.
763     **
764     ** Revision 1.1 2002/05/15 09:00:57 dtashley
765     ** Initial checkin.
766     ****************************************************************************
767     ** End of ESRG_RAND_INT.H. */

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