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Date: Fri, 17 Aug 2012 21:00:25 +0400
From: Pavel Semjanov <pavel@...janov.com>
To: john-dev@...ts.openwall.com
Subject: Re: RAR early reject
On 17.08.2012 20:44, Pavel Semjanov wrote:
> On 17.08.2012 19:48, magnum wrote:
>> On 2012-08-17 16:53, magnum wrote:
>>> On 2012-08-17 15:52, Pavel Semjanov wrote:
>>>> BTW, among all those test files (-m1 to -m5) I have yet to see a
>>>>> valid stream use PPM in the first block. I start to think we can
>>>>> reject
>>>>> all PPM. Do you know something to the contrary?
>>>>
>>>> Something strange again.
>>>> -m4, -m5 option really forces PPM code. -m1 to -m3 should force LZ
>>>> code.
>>
>> I can not reproduce this. I create archives (using linux rar 4.00 beta
>> 3) with -m4 and -m5 and debug output shows that first block is an LZ
>> block, unrar.c populates a Huffman table and correctly inflates the
>> data. Maybe second block and on will be PPM?
>
>
> Hmm, you're right. It seems that PPM no longer (or very rarely) used in
> rar 4.x. You need rar 3.x to test ppm. That's why your code passed the
> tests ;-)
>
Fix: use -mct to force ppm in rar 4.x
--
SY / C4acT/\uBo Pavel Semjanov
_ _ _ http://www.semjanov.com
| | |-| |_|_| |-|
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