ASP编码和解码函数详解

Function URLDecode(enStr) 
 dim deStr,strSpecial 
 dim c,i,v 
  deStr=""
  strSpecial="!""#$%&'()*+,.-_/:;<=>?@[/]^`{|}~%"
  for i=1 to len(enStr) 
   c=Mid(enStr,i,1) 
   if c="%" then 
    v=eval("&h"+Mid(enStr,i+1,2)) 
    if inStr(strSpecial,chr(v))>0 then 
     deStr=deStr&chr(v) 
     i=i+2 
    else
     v=eval("&h"+ Mid(enStr,i+1,2) + Mid(enStr,i+4,2)) 
     deStr=deStr & chr(v) 
     i=i+5 
    end if
   else
    if c="+" then 
     deStr=deStr&" "
    else
     deStr=deStr&c 
    end if
   end if
  next 
  URLDecode=deStr 
End function

private Function URLEncoding(vstrIn) 
  strReturn = ""
  For i = 1 To Len(vstrIn) 
  ThisChr = Mid(vStrIn,i,1) 
  If Abs(Asc(ThisChr)) < &HFF Then 
  strReturn = strReturn & ThisChr 
  Else 
  innerCode = Asc(ThisChr) 
  If innerCode < 0 Then 
  innerCode = innerCode + &H10000 
  End If 
  Hight8 = (innerCode And &HFF00)/ &HFF 
  Low8 = innerCode And &HFF 
  strReturn = strReturn & "%" & Hex(Hight8) & "%" & Hex(Low8) 
  End If 
  Next 
  URLEncoding = strReturn 
End Function