?? arcmak.c
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#define NRANSI#include "nrutil.h"#include <limits.h>#define MC 512#ifdef ULONG_MAX#define MAXINT (ULONG_MAX >> 1)#else#define MAXINT 2147483647#endiftypedef struct { unsigned long *ilob,*iupb,*ncumfq,jdif,nc,minint,nch,ncum,nrad;} arithcode;void arcmak(unsigned long nfreq[], unsigned long nchh, unsigned long nradd, arithcode *acode){ unsigned long j; if (nchh > MC) nrerror("input radix may not exceed MC in arcmak."); if (nradd > 256) nrerror("output radix may not exceed 256 in arcmak."); acode->minint=MAXINT/nradd; acode->nch=nchh; acode->nrad=nradd; acode->ncumfq[1]=0; for (j=2;j<=acode->nch+1;j++) acode->ncumfq[j]=acode->ncumfq[j-1]+IMAX(nfreq[j-1],1); acode->ncum=acode->ncumfq[acode->nch+2]=acode->ncumfq[acode->nch+1]+1;}#undef MC#undef MAXINT#undef NRANSI
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