Bug in parsing email body

For one specific message, the Email Message Parser is corrupting the message body. I will paste the raw email content below (can't see how to send as an attachment).

It's just a plain text email (Content-Type: text/plain; charset="big5").

If I decode the base64 body, the message looks ok, and is also displayed ok in Thunderbird email client. However the output from function Decode only contains the first 40 characters of the body as they should be - after this it's a load of garbled characters.


From groundologyfilter+caf_=filtered=cs.groundology.com@gmail.com Mon Mar 19 00:35:02 2018
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From: Lawrence Yeung <lawrence_yeung@hotmail.com>
To: Groundology <contact@groundology.com>
Subject: Re: Your order confirmation
Thread-Topic: Your order confirmation
Thread-Index: AQHTvtRnVht7fRkcK0Oemt4S38A2XKPWtg8z
Date: Mon, 19 Mar 2018 00:33:11 +0000
Message-ID: <CY4PR17MB0982C4222CC87B88E0B72490F5D40@CY4PR17MB0982.namprd17.prod.outlook.com>
References: <2ea975c9-4db0-438a-a2e1-97508d9db910@mtasv.net>
In-Reply-To: <2ea975c9-4db0-438a-a2e1-97508d9db910@mtasv.net>
Accept-Language: en-US
Content-Language: zh-TW
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
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x-ms-exchange-messagesentrepresentingtype: 1
x-tmn: [4F5P6lIt3BVobJyHa9g4NcMCW7Mqq8C9]
x-ms-publictraffictype: Email
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x-ms-traffictypediagnostic: BY2NAM03HT176:
x-ms-office365-filtering-correlation-id: 95d714ee-1e6f-41ac-122e-08d58d30ff18
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Came across another message which triggers the same bug. The problem occurs with plain text (single part) base64 encoding messages.

The problem is the base64 encoded block being split at random means that it can't be decoded properly.

Increasing $message_buffer_length larger than the whole message makes the problem go away.

Let me know if you need more sample emails that trigger this bug.

Sorry for the delay. Can you send me that message via email?

Hi Manuel,

I sent the raw email data to you by email. With this particular email, the bug is triggered when $message_buffer_length has the default value of 8000.

Seb