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1 /* $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
8 //-------------------------------------------------------------------------------------------------
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681 //into proprietary programs. If your program is a subroutine library, you
682 //may consider it more useful to permit linking proprietary applications with
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684 //Public License instead of this License. But first, please read
685 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
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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