[Tickets #14813] Horde Text Diff crashes when comparing large strings

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Ticket URL: https://bugs.horde.org/ticket/14813
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  Ticket             | 14813
  Created By         | [email protected]
  Summary            | Horde Text Diff crashes when comparing large strings
  Queue              | Horde Framework Packages
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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[email protected] (2018-04-30 09:40) wrote:

Hi,

I have a web app live in production, that compares two large strings,  
less than 5 MB in size.

And it's crashing right at the 3rd line below. Doesn't get past line 3 below.

$diff = new Horde_Text_Diff('auto', array( explode("\n", $contentsOld)  
, explode("\n", $contentsNew) ) );
$renderer = new Horde_Text_Diff_Renderer_Inline();
$diff = $renderer->render($diff);

$contentsOld and $contentsNew contain the two large strings - one read  
from a MySQL mediumtext field, and another coming from  
file_get_contents of a URL. Works fine for most use cases, but crashes  
when it gets above a certain size. I'm guessing around the 4-5 MB size.

Is there any way to get it to exit gracefully? It doesn't seem to be  
throwing any exceptions either.

And is there a way to know exactly where it's failing?

Thanks!

- Ravi



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