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#import <CommonCrypto/CommonDigest.h>

- (NSString *)localPathForURL:(NSURL *)url {
	const char *cStr = [[url absoluteString] UTF8String];
	unsigned char result[16];
	CC_MD5( cStr, strlen(cStr), result );
	NSString *md5sum = [NSString stringWithFormat:
						@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
						result[0], result[1], result[2], result[3], 
						result[4], result[5], result[6], result[7],
						result[8], result[9], result[10], result[11],
						result[12], result[13], result[14], result[15]
						];
	
	return [[self cacheDir] stringByAppendingPathComponent: md5sum];	
}