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asp中几个常用的编码转换函数

<%
'UTF转GB
function UTF2GB(UTFStr)
for Dig=1 to len(UTFStr)
  if mid(UTFStr,Dig,1)="%" then
   if len(UTFStr) >= Dig+8 then
    GBStr=GBStr & ConvChinese(mid(UTFStr,Dig,9))
    Dig=Dig+8
   else
    GBStr=GBStr & mid(UTFStr,Dig,1)
   end if
  else
  GBStr=GBStr & mid(UTFStr,Dig,1)
  end if
next
UTF2GB=GBStr
end function

function ConvChinese(x)
A=split(mid(x,2),"%")
i=0
j=0

for i=0 to ubound(A)
  A(i)=c16to2(A(i))
next

for i=0 to ubound(A)-1
  DigS=instr(A(i),"0")
  Unicode=""
  for j=1 to DigS-1
   if j=1 then
    A(i)=right(A(i),len(A(i))-DigS)
    Unicode=Unicode & A(i)
   else
    i=i+1
    A(i)=right(A(i),len(A(i))-2)
    Unicode=Unicode & A(i)
   end if
  next

  if len(c2to16(Unicode))=4 then
   ConvChinese=ConvChinese & chrw(int("&H" & c2to16(Unicode)))
  else
   ConvChinese=ConvChinese & chr(int("&H" & c2to16(Unicode)))
  end if
next
end function

function c2to16(x)
i=1
for i=1 to len(x) step 4
  c2to16=c2to16 & hex(c2to10(mid(x,i,4)))
next
end function

function c2to10(x)
c2to10=0
if x="0" then exit function
i=0
for i= 0 to len(x) -1
  if mid(x,len(x)-i,1)="1" then c2to10=c2to10+2^(i)
next
end function

function c16to2(x)
i=0
for i=1 to len(trim(x))
  tempstr= c10to2(cint(int("&h" & mid(x,i,1))))
  do while len(tempstr)<4
   tempstr="0" & tempstr
  loop
  c16to2=c16to2 & tempstr
next
end function

function c10to2(x)
mysign=sgn(x)
x=abs(x)
DigS=1
do
  if x<2^DigS then
   exit do
  else
   DigS=DigS+1
  end if
loop
tempnum=x

i=0
for i=DigS to 1 step-1
  if tempnum>=2^(i-1) then
   tempnum=tempnum-2^(i-1)
   c10to2=c10to2 & "1"
  else
   c10to2=c10to2 & "0"
  end if
next
if mysign=-1 then c10to2="-" & c10to2
end function

'GB转UTF8
Function toUTF8(szInput)
    Dim wch, uch, szRet
    Dim x
    Dim nAsc, nAsc2, nAsc3
    
    If szInput = "" Then
        toUTF8 = szInput
        Exit Function
    End If
    For x = 1 To Len(szInput)
        wch = Mid(szInput, x, 1)
        nAsc = AscW(wch)
        If nAsc < 0 Then nAsc = nAsc + 65536
    
        If (nAsc And &HFF80) = 0 Then
            szRet = szRet & wch
        Else
            If (nAsc And &HF000) = 0 Then
                uch = "%" & Hex(((nAsc \ 2 ^ 6)) or &HC0) & Hex(nAsc And &H3F or &H80)
                szRet = szRet & uch
            Else
                uch = "%" & Hex((nAsc \ 2 ^ 12) or &HE0) & "%" & _
                            Hex((nAsc \ 2 ^ 6) And &H3F or &H80) & "%" & _
                            Hex(nAsc And &H3F or &H80)
                szRet = szRet & uch
            End If
        End If
    Next
        
    toUTF8 = szRet
End Function

'GB转unicode
function chinese2unicode(Str)
  dim i
  dim Str_one
  dim Str_unicode
  if(isnull(Str)) then
exit function
  end if
  for i=1 to len(Str)
    Str_one=Mid(Str,i,1)
    Str_unicode=Str_unicode&chr(38)
    Str_unicode=Str_unicode&chr(35)
    Str_unicode=Str_unicode&chr(120)
    Str_unicode=Str_unicode& Hex(ascw(Str_one))
    Str_unicode=Str_unicode&chr(59)
  next
  chinese2unicode=Str_unicode
end function  

'URL解码
Function URLDecode(enStr)
dim deStr
dim c,i,v
deStr=""
for i=1 to len(enStr)
  c=Mid(enStr,i,1)
  if c="%" then
   v=eval("&h"+Mid(enStr,i+1,2))
   if v<128 then
    deStr=deStr&chr(v)
    i=i+2
   else
    if isvalidhex(mid(enstr,i,3)) then
     if isvalidhex(mid(enstr,i+3,3)) then
      v=eval("&h"+Mid(enStr,i+1,2)+Mid(enStr,i+4,2))
      deStr=deStr&chr(v)
      i=i+5
     else
      v=eval("&h"+Mid(enStr,i+1,2)+cstr(hex(asc(Mid(enStr,i+3,1)))))
      deStr=deStr&chr(v)
      i=i+3
     end if
    else
     destr=destr&c
    end if
   end if
  else
   if c="+" then
    deStr=deStr&" "
   else
    deStr=deStr&c
   end if
  end if
next
URLDecode=deStr
end function

function isvalidhex(str)
dim c
isvalidhex=true
str=ucase(str)
if len(str)<>3 then isvalidhex=false:exit function
if left(str,1)<>"%" then isvalidhex=false:exit function
  c=mid(str,2,1)
if not (((c>="0") and (c<="9")) or ((c>="A") and (c<="Z"))) then isvalidhex=false:exit function
  c=mid(str,3,1)
if not (((c>="0") and (c<="9")) or ((c>="A") and (c<="Z"))) then isvalidhex=false:exit function
end function
%>




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