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Îļþ¼ÓÃܼ¼ÊõÒ»Àý ¸øÎļþ¼ÓÃܵļ¼ÊõºÜ¶à,ÆäÖÐÓÖ·ÖΪ²»Í¬µÈ¼¶,ÒÔÊʺϲ»Í¬³¡ºÏµÄÐèÒª.ÕâÀï¸ø³ö×î¼òµ¥µÄÎļþ¼ÓÃܼ¼Êõ,¼´²ÉÓÃÎļþÖð×Ö½ÚÓëÃÜÂëÒì»ò·½Ê½¶Ô Îļþ½øÐмÓÃÜ,µ±½âÃÜʱ,Ö»ÐèÔÙÔËÐÐÒ»±é¼ÓÃܳÌÐò¼´¿É. ¡¡¡¡ÏÂÃæÊÇÒ»¸öʵÀý³ÌÐò,ÄܶÔÈÎÒâÒ»¸öÎļþ½øÐмÓÃÜ,ÃÜÂëÒªÇóÓû§ÊäÈë,ÏÞ8λÒÔÄÚ(µ±È»Äã¿ÉÒÔÔÙ¸ü¸Ä).³ÌÐòÓкܺõÄÈÝ´íÉè¼Æ,ÕâÊÇÎÒÃÇÓ¦¸Ã ѧϰµÄ. /* Turbo 2.0 pass. give file a password! */ #include<stdio.h> #include<stdlib.h> #include<conio.h> #include<string.h> void dofile(char *in_fname,char *pwd,char *out_fname);/*¶ÔÎļþ½øÐмÓÃܵľßÌ庯Êý*/ void main(int argc,char *argv[])/*¶¨Òåmain()º¯ÊýµÄÃüÁîÐвÎÊý*/ { char in_fname[30];/*Óû§ÊäÈëµÄÒª¼ÓÃܵÄÎļþÃû*/ char out_fname[30]; char pwd[8];/*ÓÃÀ´±£´æÃÜÂë*/ if(argc!=4){/*ÈÝ´í´¦Àí*/ printf("\nIn-fname:\n"); gets(in_fname);/*µÃµ½Òª¼ÓÃܵÄÎļþÃû*/ printf("Password:\n"); gets(pwd);/*µÃµ½ÃÜÂë*/ printf("Out-file:\n"); gets(out_fname);/*µÃµ½¼ÓÃܺóÄãÒªµÄÎļþÃû*/ dofile(in_fname,pwd,out_fname); } else{/*Èç¹ûÃüÁîÐвÎÊýÕýÈ·,±ãÖ±½ÓÔËÐгÌÐò*/ strcpy(in_fname,argv[1]); strcpy(pwd,argv[2]); strcpy(out_fname,argv[3]); dofile(in_fname,pwd,out_fname); } } /*¼ÓÃÜ×Óº¯Êý¿ªÊ¼*/ void dofile(char *in_fname,char *pwd,char *out_file) { FILE *fp1,*fp2; register char ch; int j=0; int j0=0; fp1=fopen(in_fname,"rb"); if(fp1==NULL){ printf("cannot open in-file.\n"); exit(1);/*Èç¹û²»ÄÜ´ò¿ªÒª¼ÓÃܵÄÎļþ,±ãÍ˳ö³ÌÐò*/ } fp2=fopen(out_file,"wb"); if(fp2==NULL){ printf("cannot open or create out-file.\n"); exit(1);/*Èç¹û²»Äܽ¨Á¢¼ÓÃܺóµÄÎļþ,±ãÍ˳ö*/ } while(pwd[++j0]); ch=fgetc(fp1); /*¼ÓÃÜËã·¨¿ªÊ¼*/ while(!feof(fp1)){ fputc(ch^pwd[j>=j0?j=0:j++],fp2);/*Òì»òºóдÈëfp2Îļþ*/ ch=fgetc(fp1); } fclose(fp1);/*¹Ø±ÕÔ´Îļþ*/ fclose(fp2);/*¹Ø±ÕÄ¿±êÎļþ*/ } /*³ÌÐò½áÊø*/    Êղؠ  ·ÖÏí   ¶¥(0)

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