SCUMM: Add a tool for extracting lfg archive from version of indy4

[phcoder]

No description provided.

[einstein95]

May want to rename it to something like extract_lfg, as the LFG! archives were used in more than Indy4, including the German version of MI2 and the LucasArts Classic Adventures

[einstein95]

Looks like that some files use a dictionary size of 0 which dcl.cpp doesn't support, some games used this for 00.LFL/000.LFL so supporting it is probably needed. Here's a demo that uses it for READ.ME
indy4_demo.zip

[dwatteau]

Thank you for implementing this!

The format has also been described here for reference: http://seltmannsoftware.blogspot.com/2017/05/adventures-in-useless-reverse.html

I have such an archive for Indy4-dos-fr and one for Monkey2-dos-en. I'll test them with your PR later today.

[phcoder]

Looks like that some files use a dictionary size of 0 which dcl.cpp doesn't support, some games used this for 00.LFL/000.LFL so supporting it is probably needed. Here's a demo that uses it for READ.ME indy4_demo.zip

Thank you for this file. It turned out that name field is 13 bytes rather than unlimited null-terminated. After fixing this, it works

[phcoder]

May want to rename it to something like extract_lfg, as the LFG! archives were used in more than Indy4, including the German version of MI2 and the LucasArts Classic Adventures

Thank you. Renamed to extract_lfg and added a bit of more info for useful testing

[phcoder]

Thank you for implementing this!

The format has also been described here for reference: http://seltmannsoftware.blogspot.com/2017/05/adventures-in-useless-reverse.html

I have such an archive for Indy4-dos-fr and one for Monkey2-dos-en. I'll test them with your PR later today.

Thank you for the link. It cleared up couple of wrong assumptions

[dwatteau]

FWIW, I may need to wait a few more days to be able to test it with my own set of LFG images; probably this weekend I guess.

[dwatteau]

Testing from my own LFG archives (which are known to work with the original DOS extractor and with the other extractor that's on Github):

• Indy4, French floppy release put on CD-ROM by Ubisoft: ATLANTIS.000 is OK, ATLANTIS.001 has the right number of bytes but a good chunk of them are NUL
• Monkey2, English floppy release from the Limited Run Games set, MONKEY2.000 is missing, and MONKEY2.001 is invalid too

@phcoder You can ping me over Discord for easier checking of those. Thanks!