extract.c

从简单加密的文件中释放出原文件中

// Hero Tech. Copyright 2007 by AlexMozh

/*	Extract file sre.bmp       */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <process.h>
#include <dos.h>
#include <bios.h>
#include <io.h>

int main()
{

  FILE *fp,*fromfp,*tofp;
  int i,j,k,l;
  long unitlen=2048;
  long baseadd=0x1000;
  char ch;
  char sh[21];
  char pw[21]={"AronAlex2006"};
  char pw1[21]={"HeroTech"};
  char mysh[21]={""};
  char filename[128]={"kov.zip"};
  char toname[128]={"sre.bmp"};
  char buf[2048];
  unsigned attrib;
  unsigned id;
  unsigned cw[257];
  unsigned long m=0;
  long len,adds;
  unsigned char hdno=0x80;
  char secbuf[512];



// ========== Open the file <filename> ==========

  if ((fp=fopen(filename,"rb"))==NULL)
  {
    return 1 ;
  }


// ========= Restort sre.bmp from file <filename> to d:\ ===========

  if ((tofp=fopen(toname,"wb"))==NULL)
  {
    return 1 ;
  }

  fseek(fp,baseadd,SEEK_SET);
  fread(&adds,4,1,fp);
  fread(&len,4,1,fp);
  j=len / unitlen;
  k=len % unitlen;

  fseek(fp,adds,SEEK_SET);

  for (i=0;i<j;i++)
  {
    fread(buf,unitlen,1,fp);
    fwrite(buf,unitlen,1,tofp);
    fseek(fp,1,SEEK_CUR);
  }

  if (k>0)
  {
    fread(buf,k,1,fp);
    fwrite(buf,k,1,tofp);
  }


  fclose(fp);
  fclose(tofp);

  return 0;

}