[Imap-protocol] Question on BODYSTRUCTURE

I'm working on parsing email to construct BODYSTRUCTURE response back to
client.

I put together a simple email with some text, image and an attachment on
gmail, so I can have a guideline by comparing its response back to RFC.
Here's the response :

 

* 35 FETCH (BODYSTRUCTURE (((("TEXT" "PLAIN" ("CHARSET" "big5") NIL NIL
"7BIT" 860 14 NIL NIL NIL)("TEXT" "HTML" ("CHARSET" "big5") NIL NIL
"QUOTED-PRINTABLE" 4347 63 NIL NIL NIL) "ALTERNATIVE" ("BOUNDARY"
"----=_NextPart_002_0025_01CE5E06.E9940610") NIL NIL)("IMAGE" "PNG" ("NAME"
"image001.png") "<[email protected]>" NIL "BASE64" 231788 NIL
NIL NIL) "RELATED" ("BOUNDARY" "----=_NextPart_001_0024_01CE5E06.E9940610")
NIL NIL)("IMAGE" "PNG" ("NAME" "DNS_MX_RECORD.png") NIL NIL "BASE64" 73572
NIL ("ATTACHMENT" ("FILENAME" "DNS_MX_RECORD.png")) NIL) "MIXED" ("BOUNDARY"
"----=_NextPart

_000_0023_01CE5E06.E9940610") NIL NIL))

 

However, when I tried to match up the fields with RFC, it seemed to be
missing an extension data item or am I misinterpreting the RFC?

For the non-multipart body part, I thought the format should be :

 

body-type body-subtype (parenthesized list of parameter) body-id body-desc
body-encoding body-size

 

if body-type = "text" then follow by <number of lines in body>

if body-type = "message" and body-subtype = "rfc822" then follow by
envelope, body structure, number of lines in message

 

lastly, follow by 4 extension data items : MD5, body disposition, body
language, body location

 

so, shouldn’t the first part look like this instead?

 

("TEXT" "PLAIN" ("CHARSET" "big5") NIL NIL "7BIT" 860 14 NIL NIL NIL NIL)
<--- I added body location data item

 

Also, I couldn't figure out what are the remaining fields for the multipart.
In my example above, what do the last 2 NIL represent after "MIXED"
("BOUNDARY" "----=_NextPart

_000_0023_01CE5E06.E9940610")?  I thought for multipart, it also follows by
4 extension data?

 

 

Thank you for your help~~

 

Helen

 


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