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dpurdie |
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' Base64Encode
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' Used in http Basic Authentication
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'
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' ripped from: 'http://www.pstruh.cz/tips/detpg_Base64Encode.htm
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' rfc1521
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' 2001 Antonin Foller, PSTRUH Software, http://pstruh.cz
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'=====================================================
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'
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'------------ Functions -----------------------
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Function Base64Encode(inData)
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Const Base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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Dim sOut, I
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'For each group of 3 bytes
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For I = 1 To Len(inData) Step 3
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Dim nGroup, pOut
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'Create one long from this 3 bytes.
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nGroup = &H10000 * Asc(Mid(inData, I, 1)) + _
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&H100 * MyASC(Mid(inData, I + 1, 1)) + _
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MyASC(Mid(inData, I + 2, 1))
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'Oct splits the long To 8 groups with 3 bits
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nGroup = Oct(nGroup)
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'Add leading zeros
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nGroup = String(8 - Len(nGroup), "0") & nGroup
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'Convert To base64
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pOut = Mid(Base64, CLng("&o" & Mid(nGroup, 1, 2)) + 1, 1) + _
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Mid(Base64, CLng("&o" & Mid(nGroup, 3, 2)) + 1, 1) + _
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Mid(Base64, CLng("&o" & Mid(nGroup, 5, 2)) + 1, 1) + _
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Mid(Base64, CLng("&o" & Mid(nGroup, 7, 2)) + 1, 1)
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'Add the part To OutPut string
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sOut = sOut + pOut
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Next
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Select Case Len(inData) Mod 3
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Case 1: '8 bit final
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sOut = Left(sOut, Len(sOut) - 2) + "=="
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Case 2: '16 bit final
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sOut = Left(sOut, Len(sOut) - 1) + "="
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End Select
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Base64Encode = sOut
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End Function
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Function MyASC(OneChar)
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If OneChar = "" Then MyASC = 0 Else MyASC = Asc(OneChar)
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End Function
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'-- End of File
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