base64.asp

来自「国内第一数字点卡销售程序。功能强大。 完整无错！数据文件经MD5加密！经严格测」· ASP 代码 · 共 199 行

<%
sBASE_64_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" 
sBASE_64_CHARACTERS = strUnicode2Ansi(sBASE_64_CHARACTERS)

Function strUnicodeLen(asContents)
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)
strUnicode2Ansi=""
len1=len(asContents)
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)
strAnsi2Unicode = ""
len1=lenb(asContents)
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 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_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 

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_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) 

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_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 
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_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 
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 

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