tbin.cpp

来自「ftplink」· C++ 代码 · 共 93 行

#include <windows.h>
#include <stdio.h>
#include "tkeytab.h"

char passwd[30];
char randm_pwd[30];

int get_value(int ch,int cv)
{
	int	i;
    ch&=0xff;
    cv&=0xff;

	for (i=0;i<256;i++) {
		if (keytab[ch][i]==cv)
			break;
	}
	return i;
}

int Fjm(char *name)
{
	FILE *fpin,*fpout;
	int i,j;
	int jm_len,addr,addr2,chr,value;

	//打开文件
	memset(passwd,0xff,30);
	if ((fpin=fopen(name,"rb"))==NULL) return 0;
	jm_len=fgetc(fpin);
	for (i=0;i<jm_len;i++)
		randm_pwd[i]=(char)fgetc(fpin);
	addr=fgetc(fpin);
	addr+=fgetc(fpin)*256+78;
	addr2=addr+jm_len+3;
	fseek (fpin,addr2,SEEK_SET);
	for (i=0;i<jm_len;i++) {
		chr=fgetc(fpin)^randm_pwd[i];
		passwd[i]=(char)chr;
	}

	if (!GetTempPath(250,name)) {
		fclose(fpin);
		return 0;
	}
	strcat(name,"\\tmpfile");
	if ((fpout=fopen(name,"wb"))==NULL) {
		fclose(fpin);
		return 0;
	}

	//加密区
	fseek(fpin,jm_len+3,SEEK_SET);
	for (j=0,i=0;j<addr;j++,i++)
	{
		if (i==jm_len) i=0;
		value=(unsigned)passwd[i];
		fread(randm_pwd,1,1,fpin);
		chr=randm_pwd[0];
		randm_pwd[0]=(unsigned)get_value(value,chr);
		if (j>=78) fwrite(randm_pwd,1,1,fpout);
	}


	//保留区
	for (;j<addr+jm_len;j++)
	{
		fread(randm_pwd,1,1,fpin);
		fwrite(randm_pwd,1,1,fpout);
	}

	//加密区

	fread(randm_pwd,1,1,fpin);
	chr=randm_pwd[0];

	for (;!feof(fpin);j++,i++)
	{
		if (i==jm_len) i=0;
		value=(unsigned)passwd[i];

		randm_pwd[0]=(unsigned)get_value(value,chr);
		fwrite(randm_pwd,1,1,fpout);

		fread(randm_pwd,1,1,fpin);
		chr=randm_pwd[0];
	}

	fclose(fpin);
	fclose(fpout);
	return 1;
}