asp写的汉字转换utf-8及utf-8转gb2312的代码

function chinese2unicode(str)
dim i
dim str_one
dim str_unicode
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
response.write str_unicode
end function

'utf-8 to gb2312
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