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(VBScript) MIME Content-Transfer-Encoding Header Field

Explains the Content-Transfer-Encoding header field and how it affects how data is stored in the MIME.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

'  The Content-Transfer-Encoding header field is typically set to one of these values:
' 
'    base64
'    quoted-printable
'    binary
'    8bit
'    7bit

'  If the encoding is base64 or quoted-printable, then the bytes of the content are encoded as such.
'  The values "8bit", "7bit", and "binary" all imply that NO encoding has been performed.

'  Here are some guidelines and hints:
' 
'  1) "8bit", "7bit", and "binary" encodings (i.e. NO encoding) results in the smallest MIME.

'  2) A "binary" encoding implies non-text data.  Binary MIME CANNOT be retrieved as a string.  It can only be retrieved as a byte array.

'  3) "8bit" and "7bit" encodings imply text.
'     7bit implies that the text is us-ascii (all byte values less than or equal to 0x7F).
'     8bit implies that the text contains non-us-ascii chars.

'  4) Base64 is the best choice for encoding non-text data, such as PDF's, images, etc.

'  5) quoted-printable is the best choice for encoding text data where most chars are going to be us-ascii. This would typically
'     include all Western European languages.  For Asian, Arabic, Hebrew, etc. where most chars in the text are non-us-ascii,
'     the most efficient encoding would be base64.

'  Let's demonstrate with this small JPG image.

set sbJpgBase64 = CreateObject("Chilkat_9_5_0.StringBuilder")
success = sbJpgBase64.Append("/9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g" & vbCrLf)
success = sbJpgBase64.Append("NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf" & vbCrLf)
success = sbJpgBase64.Append("YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj" & vbCrLf)
success = sbJpgBase64.Append("Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA" & vbCrLf)
success = sbJpgBase64.Append("AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY" & vbCrLf)
success = sbJpgBase64.Append("NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+" & vbCrLf)
success = sbJpgBase64.Append("pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq" & vbCrLf)
success = sbJpgBase64.Append("Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc" & vbCrLf)
success = sbJpgBase64.Append("enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg" & vbCrLf)
success = sbJpgBase64.Append("xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9" & vbCrLf)
success = sbJpgBase64.Append("DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA" & vbCrLf)
success = sbJpgBase64.Append("AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA" & vbCrLf)
success = sbJpgBase64.Append("QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx" & vbCrLf)
success = sbJpgBase64.Append("EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==" & vbCrLf)

set mime = CreateObject("Chilkat_9_5_0.Mime")
mime.ContentType = "image/jpeg"
success = mime.SetBodyFromEncoded("base64",sbJpgBase64.GetAsString())

outFile.WriteLine(mime.GetMime())
outFile.WriteLine("-")

'  The result:
' 
'  	Content-Type: image/jpeg
'  	Content-Transfer-Encoding: base64
' 
'  	/9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
'  	NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
'  	YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
'  	Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
'  	AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
'  	NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
'  	pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
'  	Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
'  	enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
'  	xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
'  	DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
'  	AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
'  	QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
'  	EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
' 

'  Set the Content-Transfer-Encoding to "binary" by setting the Encoding property.
mime.Encoding = "binary"

'  Try to get the MIME string.  This CANNOT be done.  The bytes of the JPG image do not
'  represent chars, and to return a string means that bytes must be interpreted according
'  to some character encoding (such as utf-8).  Non-text binary bytes can only be
'  contained in a string IF encoded in some way. Encodings such as Base64, quoted-printable,
'  URL, etc. exist to make it possible to represent binary data in string format.
outFile.WriteLine(mime.GetMime())
outFile.WriteLine("-")

'  We CAN get the binary MIME as bytes..

mimeBytes = mime.GetMimeBytes()

'  Regardless of the Content-Transfer-Encoding, the
'  body content can always be retrieved and the body bytes
'  decoded from whatever encoding is used..

jpgBytes = mime.GetBodyBinary()

'  To get the body in base64 format, first make sure
'  the Content-Transfer-Encoding is base64, then call GetBodyEncoded.
mime.Encoding = "base64"
jpgBase64 = mime.GetBodyEncoded()
outFile.WriteLine(jpgBase64)
outFile.WriteLine("-")

'  Let's go back to "binary" MIME..
mime.Encoding = "binary"

'  Let's say we have MIME, and it was loaded directly from a file, or from
'  a byte array.  (It was not loaded from the contents of a string variable.)
'  We don't know whether the MIME contains binary or 8bit encodings, and thus
'  we dont' know if the MIME is safe to get as a string.
'  The Convert8Bit method can be called to recursively traverse the MIME and set
'  all 8bit or binary encodings to "base64".  This makes the MIME safe for storing in
'  a string.
mime.Convert8Bit 
mimeStr = mime.GetMime()
outFile.WriteLine(mimeStr)
outFile.WriteLine("-")

outFile.Close

 

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