19 lines
741 B
Text
19 lines
741 B
Text
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Function btoa$ (s As String)
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Const B64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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Dim c1 As _Byte
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Dim c2 As _Byte
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Dim c3 As _Byte
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Dim c4 As _Byte
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Dim i As Long
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Dim As String Buffer
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For i = 1 To Len(s) Step 4
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c1 = InStr(B64, Mid$(s, i + 0, 1)) - 1
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c2 = InStr(B64, Mid$(s, i + 1, 1)) - 1
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c3 = InStr(B64, Mid$(s, i + 2, 1)) - 1
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c4 = InStr(B64, Mid$(s, i + 3, 1)) - 1
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If c2 > -1 Then Buffer = Buffer + Chr$(((c1 * 4 + c2 \ 16) And 255))
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If c3 > -1 Then Buffer = Buffer + Chr$(((c2 * 16 + c3 \ 4) And 255))
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If c4 > -1 Then Buffer = Buffer + Chr$(((c3 * 64 + c4) And 255))
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Next i
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btoa$ = Buffer
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End Function
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