Exactly:

[18:26] <[-dcpp-]-rolex> !ulog tag ++ 500
66999: Buffer overflow

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https://bugs.launchpad.net/bugs/2071439

Title:
  Long and continous chat messages are not displayed at all or getting
  truncated in some cases.

Status in DC++:
  Confirmed

Bug description:
  The error actually happens when a ChatMessage has a html text element that 
contains a 65535+ character long continous text block, not broken by any (link 
or other) tag.
  Only a continous chat message text chunk of size of 64KiB+, without any 
links, URIs, etc... in it can produce this error. 
  In this scenario the whole block (or the whole message, if it consists of 
only one of such long block) is getting lost and a SimleXMLException error 
message is printed to the chat window.

  The problem is that parsing of content of this size is currently over
  the limits of SimpleXMLReader. It seems like some hubs allow such
  large messages though or their (feed or similar) bots may purposedly
  generate such large content in their normal operation.

  The maximum content length a RichTextBox can currently hold is 128 KiB
  but the default maximum protocol command length (512 KiB) allows even
  larger chat messages to reach the HTMLtoRtf process.

  One possible solution to the problem is to split any continous 64KiB+
  message values inside the html element to less than 64 KiB long pieces
  by embedding empty <span> tags into them.

  Another solution is to add a new option to SimpleXMLReader that would
  - double the maximum output value/content size allowed
  - and handle output buffer overlow errors more gracefully
  so the already parsed content up to the (now extended) size limit is not 
getting lost even when the message is still too long.

  Included a patch implementing the latter solution where it is set that
  only HtmlToRtf, which emits already processed and UTF-8 verified safe
  input data to the parser uses this new option.

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