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Fact: Staring at hex dumps makes your eyes go weird after a while. O_O
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I've just been reading
http://www.pkware.com/documents/casestudies/APPNOTE.TXT
which contains the specification of the file format used by PKZIP.
(Otherwise known as a "zip file".)
Jesus, this file format is so old and crufty! >_< Talk about lame...
Anyway, on line 554 we find the following:
compression method: (2 bytes)
(see accompanying documentation for algorithm
descriptions)
0 - The file is stored (no compression)
1 - The file is Shrunk
2 - The file is Reduced with compression factor 1
3 - The file is Reduced with compression factor 2
4 - The file is Reduced with compression factor 3
5 - The file is Reduced with compression factor 4
6 - The file is Imploded
7 - Reserved for Tokenizing compression algorithm
8 - The file is Deflated
9 - Enhanced Deflating using Deflate64(tm)
10 - PKWARE Data Compression Library Imploding (old IBM TERSE)
11 - Reserved by PKWARE
12 - File is compressed using BZIP2 algorithm
13 - Reserved by PKWARE
14 - LZMA (EFS)
15 - Reserved by PKWARE
16 - Reserved by PKWARE
17 - Reserved by PKWARE
18 - File is compressed using IBM TERSE (new)
19 - IBM LZ77 z Architecture (PFS)
97 - WavPack compressed data
98 - PPMd version I, Rev 1
It's not actually 100% clear whether these codes are decimal or
hexdecimal. But either way, I have a Zip file with nothing seems to be
able to read, and all the files are compressed with method 0x0063.
(That's 99 decimal.)
So I guess that's why nothing can read this Zip file then...
Man, spending a day staring at hex dumps is no fun at all! >_<
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> It's not actually 100% clear whether these codes are decimal or
> hexdecimal. But either way, I have a Zip file with nothing seems to be
> able to read, and all the files are compressed with method 0x0063.
> (That's 99 decimal.)
Did you try the latest version of WinZip?
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On Wed, 26 Aug 2009 15:10:30 +0200, Invisible <voi### [at] dev null> wrote:
> It's not actually 100% clear whether these codes are decimal or
> hexdecimal. But either way, I have a Zip file with nothing seems to be
> able to read, and all the files are compressed with method 0x0063.
> (That's 99 decimal.)
>
> So I guess that's why nothing can read this Zip file then...
GIYF
http://www.winzip.com/aes_info.htm
--
FE
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scott wrote:
> Did you try the latest version of WinZip?
No - for the obvious reason that this would require money.
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Fredrik Eriksson wrote:
>> all the files are compressed with method 0x0063.
>>
>> So I guess that's why nothing can read this Zip file then...
>
> GIYF
>
> http://www.winzip.com/aes_info.htm
Hmm, that also explains the 0x9901 extra record tag I keep seeing.
So it's just AES encrypted? I'm surprised 7zip can't handle that...
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Invisible wrote:
> So it's just AES encrypted? I'm surprised 7zip can't handle that...
Well would you look at that? It seems I'm using the very last version of
7zip to *not* support AES encryption. *facepalm*
I used to check the 7zip website all the time, but after years of
seeming inactivity, I gave up looking for new versions... Apparently
development has started going forward again.
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>> Did you try the latest version of WinZip?
>
> No - for the obvious reason that this would require money.
...but apparently using the latest version of 7zip fixes the problem.
It's because the files are AES-256 encrypted. Go figure.
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>> Did you try the latest version of WinZip?
>
> No - for the obvious reason that this would require money.
No it doesn't:
http://www.winzip.com/downwz.htm
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scott escreveu:
>> It's not actually 100% clear whether these codes are decimal or
>> hexdecimal. But either way, I have a Zip file with nothing seems to be
>> able to read, and all the files are compressed with method 0x0063.
>> (That's 99 decimal.)
>
> Did you try the latest version of WinZip?
You lamer! I was expecting this to make him post all day long about his
efforts to implement an unzipper in Haskell. :P
oh the fun...
--
a game sig: http://tinyurl.com/d3rxz9
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