asp base64 decoding, encoding (한글처리)

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Option Explicit



Dim sBASE_64_CHARACTERS, sBASE_64_CHARACTERSansi

sBASE_64_CHARACTERS

= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

sBASE_64_CHARACTERSansi = strUnicode2Ansi(sBASE_64_CHARACTERS)





Function strUnicodeLen(asContents)

Dim asContents1 : asContents1 ="a" & asContents

Dim Len1 : Len1=Len(asContents1)

Dim K : K=0

Dim I, Asc1



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)

Dim Len1 : Len1 = Len(asContents)

Dim I, VarCHAR, VarASC, VarHEX, VarLOW, VarHIGH



strUnicode2Ansi = ""



For I = 1 to Len1

VarCHAR = Mid(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)

Dim Len1 : Len1 = LenB(asContents)

Dim VarCHAR, VarASC, I



strAnsi2Unicode = ""



IF Len1=0 Then Exit Function



For I=1 To Len1

VarCHAR = MidB(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)

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 M3, 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))



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 = ""

lsGroupBinary = MidB(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_CHARACTERSansi, ((Byte1 And 252) \ 4) + 1,

1)

Char2 = MidB(sBASE_64_CHARACTERSansi, (((Byte2 And 240) \ 16)

Or (SaveBits1 * 16) And &HFF) + 1, 1)

Char3 = MidB(sBASE_64_CHARACTERSansi, (((Byte3 And 192) \ 64)

Or (SaveBits2 * 4) And &HFF) + 1, 1)

Char4 = MidB(sBASE_64_CHARACTERSansi, (Byte3 And 63) + 1, 1)

lsGroup64 = Char1 & Char2 & Char3 & Char4



lsResult = lsResult & lsGroup64

Next



IF M3 > 0 Then

lsGroup64 = ""

lsGroupBinary = MidB(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))



Char1 = MidB(sBASE_64_CHARACTERSansi, ((Byte1 And 252) \ 4) + 1,

1)

Char2 = MidB(sBASE_64_CHARACTERSansi, (((Byte2 And 240) \ 16)

Or (SaveBits1 * 16) And &HFF) + 1, 1)

Char3 = MidB(sBASE_64_CHARACTERSansi, (((Byte3 And 192) \ 64)

Or (SaveBits2 * 4) And &HFF) + 1, 1)



IF M3=1 Then

lsGroup64 = Char1 & Char2 & ChrB(61) & ChrB(61)

Else

lsGroup64 = Char1 & Char2 & Char3 & ChrB(61)

End IF



lsResult = lsResult & lsGroup64

End IF



Base64encode = lsResult

End Function



Function Base64decode(asContents)

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

Base64decode = ""

Exit Function

End IF



IF MidB(asContents, Len1, 1) = ChrB(61) Then M4 = 3

IF MidB(asContents, Len1-1, 1) = ChrB(61) Then M4 = 2



IF M4 = 0 Then

Len2 = Len1

Else

Len2 = Len1 - 4

End IF



For lnPosition = 1 To Len2 Step 4

lsGroupBinary = ""

lsGroup64 = MidB(asContents, lnPosition, 4)



Char1 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 1, 1)) -

1

Char2 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 2, 1)) -

1

Char3 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 3, 1)) -

1

Char4 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 4, 1)) -

1



Byte1 = ChrB(((Char2 And 48) \ 16) Or (Char1 * 4) And &HFF)

Byte2 = lsGroupBinary & ChrB(((Char3 And 60) \ 4) Or (Char2 * 16)

And &HFF)

Byte3 = ChrB((((Char3 And 3) * 64) And &HFF) Or (Char4 And 63))

lsGroupBinary = Byte1 & Byte2 & Byte3



lsResult = lsResult & lsGroupBinary

Next



IF M4 > 0 Then

lsGroupBinary = ""

lsGroup64 = MidB(asContents, Len2 + 1, M4) & ChrB(65)

IF M4=2 Then

lsGroup64 = lsGroup64 & chrB(65)

End IF

Char1 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 1, 1)) - 1

Char2 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 2, 1)) - 1

Char3 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 3, 1)) - 1

Char4 = InStrB(sBASE_64_CHARACTERSansi, MidB(lsGroup64, 4, 1)) - 1



Byte1 = ChrB(((Char2 And 48) \ 16) Or (Char1 * 4) And &HFF)

Byte2 = lsGroupBinary & ChrB(((Char3 And 60) \ 4) Or (Char2 * 16) And &HFF)

Byte3 = ChrB((((Char3 And 3) * 64) And &HFF) Or (Char4 And 63))



IF M4=2 Then

lsGroupBinary = Byte1

elseIF M4=3 Then

lsGroupBinary = Byte1 & Byte2

end IF



lsResult = lsResult & lsGroupBinary

End IF



Base64decode = lsResult

End Function





'################################## 사용 샘플 ##################################

Dim ORIGNvalue : ORIGNvalue = "하완어환오라ㅓ고ㅓ엉ㅁㄹ22ㅁㅁ@@ㅇㅁㄹ;ㄴㅇ

aabcsdfaeerdfadf"

Dim EncodeA : EncodeA = strAnsi2Unicode(Base64encode(strUnicode2Ansi

(ORIGNvalue)))

Dim DecodeA : DecodeA = strAnsi2Unicode(Base64decode(strUnicode2Ansi(EncodeA)))



response.write "------------------------------------------------------------------------<BR>"

response.write "lsResult : " & ORIGNvalue & "<BR>"

response.write "lsResult : " & EncodeA & "<BR>"

response.write "lsResult : " & DecodeA & "<BR>"

response.write "------------------------------------------------------------------------<BR>"



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