How to set receivedDataEncoding for big5 chinese?

I have a trouble in received data with chinese-big5 encoded web-page, and I tried to get some sample code but can not find I need for big5 like below:

if ([encodingName isEqualToString:@"euc-jp"]) {
    receivedDataEncoding = NSJapaneseEUCSStringEncoding;
} else {
receivedDataEncoding = NSUTF8StringEncoding};
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How to replace the part of "NSJapaneseEUCSStringEncoding" for big5 chinese encoding?

Thanks for answer first.

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You can use the kCFStringEncodingBig5_E constant which is available in

CoreFoundation/CFStringEncodingExt.h