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ASP on the base64 encoding decoding process

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<form Name="form1" method="post" action="">
<table Width="95%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td> <div Align="center">
<textarea Name="content" cols="77" rows="15" id="content"> <% = request.form ( "content ")%></ textarea>
</ Div> </ td>
</ Tr>
<tr>
<td> <div Align="center">
<input Name="jm" type="submit" id="jm" value="æäº¤">
</ Div> </ td>
</ Tr>
</ Table>
</ Form>
<%

SBASE_64_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 + /"
SBASE_64_CHARACTERS = strUnicode2Ansi (sBASE_64_CHARACTERS)

Function strUnicodeLen (asContents)
'Unicode strings of the length of the Ansi code
AsContents1 = "a" & asContents
Len1 = len (asContents1)
K = 0
For i = 1 to len1
Asc1 = asc (mid (asContents1, i, 1))
If asc1 <0 then asc1 = 65536 + asc1
If asc1> 255 then
K = k +2
Else
K = k +1
End if
Next
StrUnicodeLen = k-1
End Function

Function strUnicode2Ansi (asContents)
'Will be encoded Unicode string into Ansi encoded string
StrUnicode2Ansi = ""
Len1 = len (asContents)
For i = 1 to len1
Mid = varchar (asContents, i, 1)
Varasc = asc (varchar)
If varasc <= 0 then varasc varasc +65536
If varasc> 255 then
VarHex = Hex (varasc)
Varlow = left (varHex, 2)
Varhigh = right (varHex, 2)
StrUnicode2Ansi = strUnicode2Ansi & chrb ( "& H" & varlow) & chrb ( "& H" & varhigh)
Else
StrUnicode2Ansi = strUnicode2Ansi & chrb (varasc)
End if
Next
End function

Function strAnsi2Unicode (asContents)
'Ansi will be encoded string, converted into Unicode encoded string
StrAnsi2Unicode = ""
Len1 = lenb (asContents)
If len1 = 0 then exit function
For i = 1 to len1
= Midb varchar (asContents, i, 1)
Varasc = ascb (varchar)
If varasc> 127 then
StrAnsi2Unicode & strAnsi2Unicode = chr (ascw (midb (asContents, i +1,1) & varchar))
I = i +1
Else
StrAnsi2Unicode & strAnsi2Unicode = chr (varasc)
End if
Next
End function

Function Base64encode (asContents)
'Ansi will be coded strings Base64 encoding
'AsContents should be encoded string ANSI (binary string can)
Dim lnPosition
Dim lsResult
Dim Char1
Dim Char2
Dim Char3
Dim Char4
Dim Byte1
Dim Byte2
Dim Byte3
Dim SaveBits1
Dim SaveBits2
Dim lsGroupBinary
Dim lsGroup64
Dim m4, len1, len2

Len1 = Lenb (asContents)
If len1 <1 then
Base64encode = ""
Exit Function
End if

M3 = Len1 Mod 3
If M3> = 0 Then asContents asContents & String (3-M3, chrb (0))
'Supplement is to facilitate calculation of the median

IF m3> 0 THEN
Len1 = len1 + (3-m3)
Len2 = len1-3
Else
Len2 = len1
End if

LsResult = ""

For lnPosition = 1 To len2 Step 3
LsGroup64 = ""
Midb lsGroupBinary = (asContents, lnPosition, 3)

Byte1 = Ascb (Midb (lsGroupBinary, 1, 1)): SaveBits1 = Byte1 And 3
Byte2 = Ascb (Midb (lsGroupBinary, 2, 1)): SaveBits2 = Byte2 And 15
Byte3 = Ascb (Midb (lsGroupBinary, 3, 1))

Char1 = Midb (sBASE_64_CHARACTERS, ((Byte1 And 252) \ 4) + 1, 1)
Char2 = Midb (sBASE_64_CHARACTERS, (((Byte2 And 240) \ 16) Or (SaveBits1 * 16) And & HFF) + 1, 1)
Char3 = Midb (sBASE_64_CHARACTERS, (((Byte3 And 192) \ 64) Or (SaveBits2 * 4) And & HFF) + 1, 1)
Char4 = Midb (sBASE_64_CHARACTERS (Byte3 And 63) + 1, 1)
LsGroup64 = Char1 & Char2 & Char3 & Char4

LsResult = lsResult & lsGroup64
Next

'Dealing with the last remaining few characters
If M3> 0 then
LsGroup64 = ""
Midb lsGroupBinary = (asContents, len2 +1, 3)

Byte1 = Ascb (Midb (lsGroupBinary, 1, 1)): SaveBits1 = Byte1 And 3
Byte2 = Ascb (Midb (lsGroupBinary, 2, 1)): SaveBits2 = Byte2 And 15
Byte3 = Ascb (Midb (lsGroupBinary, 3, 1))

Then if M3 = 1
LsGroup64 = Char1 & Char2 & ChrB (61) & ChrB (61) 'use of complementary median =
Else
LsGroup64 = Char1 & Char2 & Char3 & ChrB (61) 'use of complementary median =
End if

LsResult = lsResult & lsGroup64
End if

Base64encode = lsResult

End Function

Function Base64decode (asContents)
'Base64 encoding strings will be converted into a string encoding Ansi
'AsContents should be encoded string is ANSI (binary string can)
Dim lsResult
Dim lnPosition
Dim lsGroup64, lsGroupBinary
Dim Char1, Char2, Char3, Char4
Dim Byte1, Byte2, Byte3
Dim M4, len1, len2

Len1 = Lenb (asContents)
M4 = len1 Mod 4

If len1 <1 or M4> 0 then
'String length should be a multiple of 4
Base64decode = ""
Exit Function
End if

'Is not a final judgement, =
'Judgement is not the second-worst, =
'M4 said here last remaining separate deal with the needs of the number of characters
If midb (asContents, len1, 1) = chrb (61) then m4 = 3
If midb (asContents, len1-1, 1) = chrb (61) then m4 = 2

Then if m4 = 0
Len2 = len1
Else
Len2 = len1-4
End if

For lnPosition = 1 To Len2 Step 4
LsGroupBinary = ""
Midb lsGroup64 = (asContents, lnPosition, 4)
Char1 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 1, 1)) - 1
Char2 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 2, 1)) - 1
Char3 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 3, 1)) - 1
Char4 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 4, 1)) - 1
Chrb Byte1 = (((Char2 And 48) \ 16) Or (Char1 * 4) And & HFF)
Byte2 lsGroupBinary & Chrb = (((Char3 And 60) \ 4) Or (Char2 * 16) And & HFF)
Chrb Byte3 = ((((Char3 And 3) * 64) And & HFF) Or (Char4 And 63))
LsGroupBinary = Byte1 & Byte2 & Byte3

LsResult = lsResult & lsGroupBinary
Next

'Dealing with the last remaining few characters
If M4> 0 then
LsGroupBinary = ""
Midb lsGroup64 = (asContents, len2 +1, m4) & chrB (65) 'chr (65) = A, converted into value 0
If M4 = 2 then 'fill the four, is to facilitate calculation
LsGroup64 = lsGroup64 & chrB (65)
End if
Char1 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 1, 1)) - 1
Char2 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 2, 1)) - 1
Char3 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 3, 1)) - 1
Char4 = InStrb (sBASE_64_CHARACTERS, Midb (lsGroup64, 4, 1)) - 1
Chrb Byte1 = (((Char2 And 48) \ 16) Or (Char1 * 4) And & HFF)
Byte2 lsGroupBinary & Chrb = (((Char3 And 60) \ 4) Or (Char2 * 16) And & HFF)
Chrb Byte3 = ((((Char3 And 3) * 64) And & HFF) Or (Char4 And 63))

Then if M4 = 2
LsGroupBinary = Byte1
Elseif M4 = 3 then
LsGroupBinary = Byte1 & Byte2
End if

LsResult = lsResult & lsGroupBinary
End if

Base64decode = lsResult

End Function

'————————————————- ——————————–

If request.Form ( "")<>"" then jm
Sdecode = request.Form ( "content")

Response.write replace (strAnsi2Unicode (Base64decode (strUnicode2Ansi (sdecode))), chr (13) & chr (10), "<br>") & "<hr>"

Response.end
End if

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