Base64 Encoding

Encodes data with MIME base64. This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.

• C#
• VB.Net
• C
• C++
• PHP

									Public Shared Function Base64Encoding(data As Byte()) As Char()
	Dim length As Integer, length2 As Integer
	Dim blockCount As Integer
	Dim paddingCount As Integer

	length = data.Length

	If (length Mod 3) = 0 Then
		paddingCount = 0
		blockCount = length \ 3
	Else
		paddingCount = 3 - (length Mod 3)
		blockCount = (length + paddingCount) \ 3
	End If

	length2 = length + paddingCount

	Dim source2 As Byte()
	source2 = New Byte(length2 - 1) {}

	For x As Integer = 0 To length2 - 1
		If x < length Then
			source2(x) = data(x)
		Else
			source2(x) = 0
		End If
	Next

	Dim b1 As Byte, b2 As Byte, b3 As Byte
	Dim temp As Byte, temp1 As Byte, temp2 As Byte, temp3 As Byte, temp4 As Byte
	Dim buffer As Byte() = New Byte(blockCount * 4 - 1) {}
	Dim result As Char() = New Char(blockCount * 4 - 1) {}

	For x As Integer = 0 To blockCount - 1
		b1 = source2(x * 3)
		b2 = source2(x * 3 + 1)
		b3 = source2(x * 3 + 2)

		temp1 = CByte((b1 And 252) >> 2)

		temp = CByte((b1 And 3) << 4)
		temp2 = CByte((b2 And 240) >> 4)
		temp2 += temp

		temp = CByte((b2 And 15) << 2)
		temp3 = CByte((b3 And 192) >> 6)
		temp3 += temp

		temp4 = CByte(b3 And 63)

		buffer(x * 4) = temp1
		buffer(x * 4 + 1) = temp2
		buffer(x * 4 + 2) = temp3

		buffer(x * 4 + 3) = temp4
	Next

	For x As Integer = 0 To blockCount * 4 - 1
		result(x) = SixBitToChar(buffer(x))
	Next

	Select Case paddingCount
		Case 0
			Exit Select
		Case 1
			result(blockCount * 4 - 1) = "="c
			Exit Select
		Case 2
			result(blockCount * 4 - 1) = "="c
			result(blockCount * 4 - 2) = "="c
			Exit Select
		Case Else
			Exit Select
	End Select

	Return result
End Function

Private Shared Function SixBitToChar(b As Byte) As Char
	Dim lookupTable As Char() = New Char(63) {"A"c, "B"c, "C"c, "D"c, "E"c, "F"c, _
		"G"c, "H"c, "I"c, "J"c, "K"c, "L"c, _
		"M"c, "N"c, "O"c, "P"c, "Q"c, "R"c, _
		"S"c, "T"c, "U"c, "V"c, "W"c, "X"c, _
		"Y"c, "Z"c, "a"c, "b"c, "c"c, "d"c, _
		"e"c, "f"c, "g"c, "h"c, "i"c, "j"c, _
		"k"c, "l"c, "m"c, "n"c, "o"c, "p"c, _
		"q"c, "r"c, "s"c, "t"c, "u"c, "v"c, _
		"w"c, "x"c, "y"c, "z"c, "0"c, "1"c, _
		"2"c, "3"c, "4"c, "5"c, "6"c, "7"c, _
		"8"c, "9"c, "+"c, "/"c}

	If (b >= 0) AndAlso (b <= 63) Then
		Return lookupTable(CInt(b))
	Else
		Return " "c
	End If
End Function
								

Example

									Dim data = System.Text.Encoding.Default.GetBytes("jdfgsdhfsdfsd 6445dsfsd7fg/*/+bfjsdgf%$^")
Dim value = Base64Encoding(data)
								

Output

									amRmZ3NkaGZzZGZzZCA2NDQ1ZHNmc2Q3ZmcvKi8rYmZqc2RnZiUkXg==