Encoding rule

• The Zone bit code, the GBK inner code, and the UNICODE code are all four-digit input codes.
  
  
• The encoding range of the zone bit code is: 0101~9494.
  
  
• The encoding range of the inner code is : 0xA1A1~0xFEFE.
  
  
• The corresponding relationship between zone bit encoding and inner code encoding is: zone bit encoding + 0xA0A0 = inner code encoding.
  
  
• The encoding range of the GBK inner code is: 0x8140~0xFE7E and 0x8180~0xFEFE.
  
  
• The encoding range of the UNICODE code points is: 0x4E00~0x9FA5.