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1 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_rand_int.c,v 1.4 2002/05/19 23:50:49 dtashley Exp $
2 **
3 ** A description of the functionality of this module and the public interface
4 ** definition is contained in the associated .H file.
5 */
6
7 //--------------------------------------------------------------------------------
8 //Copyright 2001 David T. Ashley
9 //-------------------------------------------------------------------------------------------------
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685 //Public License instead of this License. But first, please read
686 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
687 //-------------------------------------------------------------------------------------------------
688 //--------------------------------------------------------------------------------
689 #define MODULE_ESRG_RAND_INT
690
691 #include <assert.h>
692 #include <string.h>
693 #include <time.h>
694
695 #include "esrg_rand_int.h"
696 #include "intfunc.h"
697
698
699 void ESRG_RAND_INT_Alg01_Init(struct ESRG_RAND_INT_Alg01RngState *state,
700 int init_val)
701 {
702 int i;
703
704 assert(state != NULL);
705 assert((init_val==-1) || (init_val>0));
706
707 //Regardless of init type, zero out the structure. Among other things,
708 //this sets the number of remaining random bits to zero.
709 memset(state, 0, sizeof(*state));
710
711 if (init_val == -1)
712 {
713 //This is the system randomness initialization case. Some value
714 //of system time should be adequate to start with.
715 state->rn_seed_whole = time(NULL);
716 state->rn_seed_fractional = time(NULL);
717
718 //Flip a few bits in the seeds to hopefully make them different
719 //(but it doesn't matter if they aren't).
720 state->rn_seed_whole ^= 0xA5A5A5A5;
721 state->rn_seed_fractional ^= 0x5A5A5A5A;
722
723 //Be absolutely sure that the seeds can't be zero.
724 state->rn_seed_whole |= 0x1;
725 state->rn_seed_fractional |= 0x2;
726
727 //Iterate a small number of times to add further randomness
728 //to the two seeds.
729 for (i=0; i<3; i++)
730 {
731 state->rn_seed_whole
732 = INTFUNC_rn_power_res_16807_mapping(state->rn_seed_whole);
733 }
734
735 for (i=0; i<7; i++)
736 {
737 state->rn_seed_fractional
738 = INTFUNC_rn_power_res_16807_mapping(state->rn_seed_fractional);
739 }
740 }
741 else
742 {
743 //This is the branch where the random seed is supplied. We can
744 //use very much the same approach as above to try to get something
745 //random.
746 state->rn_seed_whole = init_val;
747 state->rn_seed_fractional = init_val;
748
749 //Flip a few bits in the seeds to hopefully make them different
750 //(but it doesn't matter if they aren't).
751 state->rn_seed_whole ^= 0xA5A5A5A5;
752 state->rn_seed_fractional ^= 0x5A5A5A5A;
753
754 //Be absolutely sure that the seeds can't be zero.
755 state->rn_seed_whole |= 0x1;
756 state->rn_seed_fractional |= 0x2;
757
758 //Iterate a small number of times to add further randomness
759 //to the two seeds.
760 for (i=0; i<3; i++)
761 {
762 state->rn_seed_whole
763 = INTFUNC_rn_power_res_16807_mapping(state->rn_seed_whole);
764 }
765
766 for (i=0; i<7; i++)
767 {
768 state->rn_seed_fractional
769 = INTFUNC_rn_power_res_16807_mapping(state->rn_seed_fractional);
770 }
771 }
772
773 //At this point the state is randomized. The number of bits valid
774 //in the bit reservoir is set to zero, so will force a restock
775 //next time.
776 }
777
778
779 //Restocks the bit reservoir.
780 static void ESRG_RAND_INT_Alg01_RestockBitBuffer(
781 struct ESRG_RAND_INT_Alg01RngState *state
782 )
783 {
784 assert(state != NULL);
785
786 //We need to keep chugging along until we get an integer with the top two
787 //bits clear. This is the only way to get a random distribution of bits.
788 do
789 {
790 assert(state->rn_seed_fractional != 0);
791 state->rn_seed_fractional
792 = INTFUNC_rn_power_res_16807_mapping(state->rn_seed_fractional);
793 } while (state->rn_seed_fractional & 0xC0000000);
794
795 //At this point the lower 30 bits should be random.
796 state->bit_buffer = state->rn_seed_fractional;
797 state->n_bb_valid = 30;
798 }
799
800
801 unsigned int ESRG_RAND_INT_Alg01_RandomBit(
802 struct ESRG_RAND_INT_Alg01RngState *state
803 )
804 {
805 int rv;
806
807 assert(state != NULL);
808
809 //Restock the supply of bits if necessary.
810 if (state->n_bb_valid == 0)
811 ESRG_RAND_INT_Alg01_RestockBitBuffer(state);
812
813 if (state->bit_buffer & 0x01)
814 rv = 1;
815 else
816 rv = 0;
817
818 state->bit_buffer >>= 1;
819 state->n_bb_valid--;
820
821 return(rv);
822 }
823
824
825 unsigned int ESRG_RAND_INT_Alg01_RandomByte(
826 struct ESRG_RAND_INT_Alg01RngState *state
827 )
828 {
829 int rv;
830
831 assert(state != NULL);
832
833 //Be sure enough bits to yank a byte.
834 if (state->n_bb_valid < 8)
835 ESRG_RAND_INT_Alg01_RestockBitBuffer(state);
836
837 //Grab the byte and return.
838 rv = state->bit_buffer & 0xFF;
839 state->bit_buffer >>= 8; //Must roll down to get new set of bits.
840 state->n_bb_valid -= 8;
841
842 return(rv);
843 }
844
845
846 const char *ESRG_RAND_INT_cvcinfo(void)
847 {
848 return("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_rand_int.c,v 1.4 2002/05/19 23:50:49 dtashley Exp $");
849 }
850
851
852 const char *ESRG_RAND_INT_hvcinfo(void)
853 {
854 return(ESRG_RAND_INT_H_VERSION);
855 }
856
857
858 /******************************************************************************
859 ** $Log: esrg_rand_int.c,v $
860 ** Revision 1.4 2002/05/19 23:50:49 dtashley
861 ** Minor bug corrected where same random byte would be supplied 3 times
862 ** in a row before new byte was supplied.
863 **
864 ** Revision 1.3 2002/05/15 21:59:22 dtashley
865 ** Checkin before .ZIP'ing up source code for assistance of newsgroup
866 ** posters.
867 **
868 ** Revision 1.2 2002/05/15 11:17:37 dtashley
869 ** Edits.
870 **
871 ** Revision 1.1 2002/05/15 09:00:57 dtashley
872 ** Initial checkin.
873 *******************************************************************************
874 ** End of ESRG_RAND_INT.C. */

dashley@gmail.com
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