Large Message Crash

[tpreusse]

If a message is bigger than the V8 string length limit (Math.pow(2, 28), ~260mb) the parser will crash with following error:

node_modules/node-mbox/src/mbox.js:100
        stream.emit('message', 'From ' + chunks.join(''));
                                                ^

RangeError: Invalid string length
    at Array.join (native)
    at SBMH.<anonymous> (node_modules/node-mbox/src/mbox.js:100:49)
    at emitMany (events.js:146:13)
    at SBMH.emit (events.js:223:7)
    at SBMH._sbmh_feed (node_modules/streamsearch/lib/sbmh.js:159:14)
    at SBMH.push (node_modules/streamsearch/lib/sbmh.js:56:14)
    at MboxStream._transform (node_modules/node-mbox/src/mbox.js:119:17)
    at MboxStream.Transform._read (_stream_transform.js:186:10)
    at MboxStream.Transform._write (_stream_transform.js:174:12)
    at doWrite (_stream_writable.js:387:12)

A potential mitigation strategy:
https://gist.github.com/tpreusse/bc2ccf6fc6bf4ff563cdd336c1728db2/revisions#diff-05028f8355c8d7379cb42b5feac6429f
(throw error by default, skip or emit partial via options)

However the ultimate solution would be create a new api which allows to stream junks (e.g. to mailparser) as they come in. mailparser can probably handle almost unlimited attachment sizes with its attachment streams.

[robertklep]

Perhaps it's easiest to create an option that, instead of emitting a message string (for the message event), it would emit a message stream, which could subsequently be passed to mailparser.

I'll have a think about it (busy with other projects at the moment) and see if I can come up with something.