GBKStringToUTF8 converts GBK encoded string gbkString to UTF-8 string.

GBKToUTF8 converts GBK encoded byte slice gbkBytes to UTF-8 byte slice.

HaveUTF8BOMHead checks whether data starts with UTF-8-BOM header.

IsUTF8 Checks whether data in utf8 format.

IsUTF8BOM checks where data encoded in UTF-8-BOM.

UTF8StringToGBK converts UTF-8 encoded string utf8String to GBK string.

UTF8ToGBK converts UTF-8 encoded byte slice utfBytes to GBK byte slice.