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#import "XADXORHandle.h"
@implementation XADXORHandle
-(id)initWithHandle:(CSHandle *)handle password:(NSData *)passdata
{
if((self=[super initWithName:[handle name]]))
{
parent=[handle retain];
password=[passdata retain];
passwordbytes=[password bytes];
passwordlength=[password length];
}
return self;
}
-(id)initAsCopyOf:(XADXORHandle *)other
{
[self _raiseNotSupported:_cmd];
return nil;
}
-(void)dealloc
{
[parent release];
[password release];
[super dealloc];
}
-(off_t)fileSize { return [parent fileSize]; }
-(off_t)offsetInFile { return [parent offsetInFile]; }
-(BOOL)atEndOfFile { return [parent atEndOfFile]; }
-(void)seekToFileOffset:(off_t)offs { [parent seekToFileOffset:offs]; }
-(void)seekToEndOfFile { [parent seekToEndOfFile]; }
-(int)readAtMost:(int)num toBuffer:(void *)buffer
{
off_t pos=[parent offsetInFile];
int actual=[parent readAtMost:num toBuffer:buffer];
if(passwordlength)
{
uint8_t *buf=(uint8_t *)buffer;
for(int i=0;i<actual;i++) buf[i]^=passwordbytes[(pos+i)%passwordlength];
}
return actual;
}
@end
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