thomas
087dc65d9a
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4241 818b1a75-f10b-46b9-bf7c-635c3b92a50f
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
#include "../../../defs.h"
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/*==============================================================================
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* taus.c
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*
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* Returns random unsigned chars as well as the new seeds.
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*
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* example: [rchar seeds] = taus(len, seeds)
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*
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* Author: Sebastian Wagner
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* Date: 23-07-2012
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*
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===============================================================================*/
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unsigned int s0, s1, s2, b;
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inline unsigned int mtaus() {
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b = (((s0 << 13) ^ s0) >> 19);
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s0 = (((s0 & 0xFFFFFFFE) << 12)^ b);
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b = (((s1 << 2) ^ s1) >> 25);
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s1 = (((s1 & 0xFFFFFFF8) << 4)^ b);
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b = (((s2 << 3) ^ s2) >> 11);
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s2 = (((s2 & 0xFFFFFFF0) << 17)^ b);
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return s0 ^ s1 ^ s2;
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}
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void mexFunction( int nlhs, mxArray *plhs[],
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int nrhs, const mxArray *prhs[]
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)
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{
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/* Declare */
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unsigned int len, *tseeds, *tseeds_out;
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unsigned char *out;
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int i;
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if(nrhs!=2)
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mexErrMsgTxt("Two inputs required.");
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else if(nlhs > 2)
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mexErrMsgTxt("Too many output arguments.");
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/* Allocate input */
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len = (unsigned int) mxGetScalar(prhs[0]);
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tseeds = (unsigned int*) mxGetData(prhs[1]);
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if (mxGetM(prhs[1])!=3 && mxGetN(prhs[1])!=3)
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mexErrMsgTxt("Three seeds are required.");
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s0 = tseeds[0];
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s1 = tseeds[1];
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s2 = tseeds[2];
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/* Allocate Output */
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plhs[0] = mxCreateNumericMatrix(len, 1, mxUINT8_CLASS, mxREAL);
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out = (unsigned char*) mxGetPr(plhs[0]);
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plhs[1] = mxCreateNumericMatrix(3, 1, mxUINT32_CLASS, mxREAL);
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tseeds_out = (unsigned int*) mxGetPr(plhs[1]);
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/* Algo */
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for(i=0;i<len;i++)
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out[i] = (unsigned char)(mtaus()&0xff);
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tseeds_out[0] = s0;
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tseeds_out[1] = s1;
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tseeds_out[2] = s2;
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} |