VB6实现Base64编码/解码

Private Const cstBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
Private arrBase64() As String

'00100001 00100001 00100001             --源码
'00001000 00010010 00000100 00100001    --Base64码

Public Function Base64Encode(strSource As String) As String
On Error Resume Next

If UBound(arrBase64) = -1 Then
    arrBase64 = Split(StrConv(cstBase64, VBUnicode), VBNullChar)
End If
Dim arrB() As Byte, bTmp(2)  As Byte, bT As Byte
Dim I As Long, J As Long
arrB = StrConv(strSource, VBFromUnicode)

J = UBound(arrB)
For I = 0 To J Step 3
    Erase bTmp
    bTmp(0) = arrB(I + 0)
    bTmp(1) = arrB(I + 1)
    bTmp(2) = arrB(I + 2)
   
    bT = (bTmp(0) And 252) / 4
    Base64Encode = Base64Encode & arrBase64(bT)
   
    bT = (bTmp(0) And 3) * 16
    bT = bT + bTmp(1) / 16
    Base64Encode = Base64Encode & arrBase64(bT)
   
    bT = (bTmp(1) And 15) * 4
    bT = bT + bTmp(2) / 64
    If I + 1 <= J Then
        Base64Encode = Base64Encode & arrBase64(bT)
    Else
        Base64Encode = Base64Encode & "="
    End If
   
    bT = bTmp(2) And 63
    If I + 2 <= J Then
        Base64Encode = Base64Encode & arrBase64(bT)
    Else
        Base64Encode = Base64Encode & "="
    End If
Next
End Function

Public Function Base64Decode(strEncoded As String) As String
On Error Resume Next
Dim arrB() As Byte, bTmp(3)  As Byte, bT, bRet() As Byte
Dim I As Long, J As Long
arrB = StrConv(strEncoded, VBFromUnicode)
J = InStr(strEncoded & "=", "=") - 2
ReDim bRet(J - J / 4 - 1)
For I = 0 To J Step 4
    Erase bTmp
    bTmp(0) = (InStr(cstBase64, Chr(arrB(I))) - 1) And 63
    bTmp(1) = (InStr(cstBase64, Chr(arrB(I + 1))) - 1) And 63
    bTmp(2) = (InStr(cstBase64, Chr(arrB(I + 2))) - 1) And 63
    bTmp(3) = (InStr(cstBase64, Chr(arrB(I + 3))) - 1) And 63
   
    bT = bTmp(0) * 2 ^ 18 + bTmp(1) * 2 ^ 12 + bTmp(2) * 2 ^ 6 + bTmp(3)
   
    bRet((I / 4) * 3) = bT / 65536
    bRet((I / 4) * 3 + 1) = (bT And 65280) / 256
    bRet((I / 4) * 3 + 2) = bT And 255
Next
Base64Decode = StrConv(bRet, VBUnicode)
End Function