ASP中实现的类似URLEncode的编码函数及对应解码函数

<%
'Coding.inc.asp
'All Rights Reserved, Room3rd@hotmail.com

Function Encode(Str)
Dim Count, Pos, Ch, Code
Dim SweetCh

'SweetCh中表示不需要进行编码的字符
SweetCh = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz_{}[]()"
Encode = ""

Count = Len(Str)
Pos = 1
Do While Pos<=Count
Ch = Mid(Str, Pos, 1)

Code = Asc(Ch)
If Code>=0 And Code<256 Then '汉字不予处理
If Ch<>"%" Then
If InStr(SweetCh, Ch)=0 Then
Ch = "%" & Right("0" & Hex(Code), 2)
End If
Else
Ch = "%"
End If
End If

Encode = Encode & Ch
Pos = Pos 1
Loop
End Function

Function Decode(Str)
Dim Count, Pos, Ch, Code

Decode = ""

Count = Len(Str)
Pos = 1
Do While Pos<=Count
Ch = Mid(Str, Pos, 1)
If Ch="%" Then
If Pos 2<=Count Then
Ch = Chr((InStr("0123456789ABCDEF", UCase(Mid(Str, Pos 1, 1)))-1) * 16 InStr("0123456789ABCDEF",UCase(Mid(Str, Pos 2, 1))) - 1)
Else
'编码串不正确
Ch = ""
End If
Pos = Pos 2
End If
Decode = Decode & Ch
Pos = Pos 1
Loop
End Function
%>

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