asp的utf-8编码转换成gb2312编码的函数

今天找到一个utf-8编码转换成gb2312编码的asp函数，能给大家解决这块问题的时候省不少事了。
代码如下:
<
%
'用途:将UTF-8编码汉字转换为GB2312编码，兼容英文和数字
'版权:虽说是原创，其实也参考别人的部分算法
'用法:Response.write UTF2GB("%E9%83%BD%E5%B8%82%E6%83%85%E7%B7%A3 %E6%98%9F%E5%BA%A7")

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
%>