cpbin.c

JPEG压缩和解压程序和一些相关的说明文档 内容比较全

#include "stddef.h"
#include "stdio.h"
main(int argc,char *argv[])
{
  FILE *file1,*file2;
  int count=0,start_position=0,diff=0,same=0,diffmeasure,diffmax=0;
  if ((file1=fopen(argv[1],"rb"))==NULL)
    printf("the %scan't  be opened",argv[1]);
  if ((file2=fopen(argv[2],"rb"))==NULL)
    printf("the %scan't  be opened",argv[2]);
  {int c1,c2;
  while(1){
    count+=1;
    if ((c1= fgetc(file1))==EOF || (c2=fgetc(file2))==EOF){
      if (same==0)
	printf("Di Nu:%d F:%d T%d\n",diff,start_position,count-1);
      else
        printf("Sa Nu:%d F:%d T%d\n",same,start_position,count-1);
      printf("The max diff is %d.\n",diffmax);
      printf("the count is %d\n",count-1);
      printf("One of the file is over now\n");
      return(0);
    }
    if ((diffmeasure=c1-c2)!=0){
      diffmeasure =diffmeasure>=0 ? diffmeasure :-diffmeasure;
      if (diffmeasure>diffmax)  diffmax=diffmeasure; 
      /*printf("c1=%d,c2=%d\n",c1,c2);*/
      if (diff++==0){
	/*printf("Sa Nu:%d F:%d T%d\n",same,start_position,count-1);*/
	same=0;
	start_position=count;
      }
    } else {
	if (same++==0){
          printf("Di Nu:%d F:%d T%d\n",diff,start_position,count-1);
	  diff=0;
	  start_position=count;
	}
      }
       


    }
    
  }

}