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Posts: 105
Registered: ‎09-06-2013
My Device: Z10
Accepted Solution

[Email] Saving attachments to base64 encoded for use in EML

I am trying to save emails to eml files. For the attachments, how do I get the base64 encoding of the binary files?


I suppose I could do a Qdatastream, but wouldnt Base64 encoding requires reading in the whole file at once?

The attachments can be from a few kb (small issue) to 50+ mbs, can anyone point me in the right direction

Posts: 571
Registered: ‎06-25-2010
My Device: Z10
My Carrier: Vodafone

Re: [Email] Saving attachments to base64 encoded for use in EML

I think Base64 encoding works on groups of 3 bytes at a time so you would not need to read the whole attachment in one go. QByteArray has a toBase64() method you could use for this.


See http://www.ietf.org/rfc/rfc2045.txt where it says:



 The encoding process represents 24-bit groups of input bits as output
   strings of 4 encoded characters.  Proceeding from left to right, a
   24-bit input group is formed by concatenating 3 8bit input groups.
   These 24 bits are then treated as 4 concatenated 6-bit groups, each
   of which is translated into a single digit in the base64 alphabet.
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