DKEYMAKE.C

#include "stdio.h"

#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long


typedef struct
{
uchar index;
uchar byte;
} sort;

int read_file(FILE *infile,sort *data);
int make(FILE *infile,FILE *outfile,sort *data);
int sortx(sort *data);
int file_error(void);
int write_file(FILE *outfile,sort *data);

main(int numargs,char *args[])
{
sort data[256];
FILE *infile;
FILE *outfile;

infile=fopen(args[1],"rb");
if (!infile)
file_error();

outfile=fopen("dekey.fil","wb");
if (!outfile)
file_error();




}

int file_error(void)
{
perror("A error occured opening files");
exit(1);

return 0;
}
 
int sortx(sort *data)
{
uchar flag;
int loop;

while (!flag)
{
flag=0;
for (loop=0;loop<=254;loop++)
{
if (*(data+loop).byte>*(data+loop+1).byte)
{
*(data+loop+1).byte=*(data+loop).byte;
*(data+loop).byte=*(data+loop+1).byte;
*(data+loop+1).index=*(data+loop).index;
*(data+loop).index=*(data+loop+1).index;
flag=1;
}
}
}


}

int make(FILE *infile,FILE *outfile,sort *data)
{
int loop;

for (loop=0;loop<=255;loop++)
{
read_file(infile,data);

sortx(data);

write_file(infile,data);

}



}


int read_file(FILE *infile,sort *data)
{
int loop;

for (loop=0;loop<=255;loop++)
{
*(data).index=loop;
*(data).byte=fgetc(infile);
}

return 0;

}


int write_file(FILE *outfile,sort *data)
{
int loop;

for (loop=0;loop<=255;loop++)
putc(*(data+loop).index,outfile);

}