Hello Mark,
[email protected] wrote:
I want to identify, with as much certainty as possible, whether a file is
lzip-compressed.
[...]
So I'd check whether something like this is true:
(DS == 0x0C) || ( DS&0x1F > 12 && DS&0x1F < 30 )
However, should I relax or remove the dictionary size upper bound? A
future version of lzip might support larger dictionary sizes without any
other changes to the file format.
The maximum dictionary size LZMA can use is (4GiB -1), and the obvious
way to code it is using the values 30, 31 and 00 to represent 1Gib, 2Gib
and (4GiB -1) respectively in bits [4:0].
So a complete test, guaranteed to work for version 1 files produced by
any future version of lzip, would be like this:
( DS & 0x1F ) > 12 || ( DS & 0x1F ) == 0 || DS == 12
Best regards,
Antonio.
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