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      /  windows-xp-source-code-leaked
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Swallow 
Re: windows-xp-source-code-leaked
Posted on 3-Oct-2020 12:24:17
#21 ]
New Member
Joined: 2-Oct-2020
Posts: 2
From: Unknown

To give this thread some Amiga relevance...

XPSP1\NT\enduser\stuff\itss\lzx
XPSP1\NT\base\mspatch\lzx

Source code of the LZX compression algorithm was never officially released, although it's a very common format used on the Amiga.

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NutsAboutAmiga 
Re: windows-xp-source-code-leaked
Posted on 3-Oct-2020 12:36:34
#22 ]
Elite Member
Joined: 9-Jun-2004
Posts: 11486
From: Norway

@Swallow

https://en.wikipedia.org/wiki/LZX

_________________
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Swallow 
Re: windows-xp-source-code-leaked
Posted on 3-Oct-2020 16:51:28
#23 ]
New Member
Joined: 2-Oct-2020
Posts: 2
From: Unknown

@NutsAboutAmiga

Decompression != Compression

There is no program besides Jonathan Forbes' LZX itself that can compress LZX archives. No PPC version exists, no way to create LZX archives natively on any other platform.

There are several LZX decompressors available, I co-authored one of them. Of course you can make guesses about the algorithms used when looking at the decompression code. You could also learn from the disassembled executable, but given the complexity of a compression method that uses several algorithms (Lempel-Ziv, Huffman, arithmetic coding) that disassembly isn't going to yield any actionable insights.

Micro$oft may have improved the compression by using dynamic and larger search distance, but the Amiga LZX method can still be reproduced using the CHM/CAB compression scheme with few modifications due to the different endianness.

Using that leaked code is of course impossible for legal reasons. But it could serve as a draft for someone to reimplement the algorithm in ar002 (LZH) - the grandfather of most archivers used in the 80s.

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