The Four Seasons Cake nds lz77 compression

[finale00]

UPDATE: Now it works

Code: Select all

#Four Seasons Cake decompress

comtype LZ77WII
idstring "CMPR"
get SIZE asize
math SIZE -= 4
get NAME filename
clog NAME 4 SIZE SIZE

........................
OLD

viewtopic.php?f=16&t=8369

Can't seem to get this working.

Code: Select all

#Four Seasons Cake decompress

comtype lz77wii_raw10
idstring "CMPR"
get TYPE byte
get SIZE long
get ZSIZE asize
math ZSIZE -= 9
get NAME filename
savepos OFFSET
clog NAME OFFSET ZSIZE SIZE

Am I just using the wrong compression type?

Compressed and decompressed attached.

[aluigi]

the error is in SIZE which is a threebyte number.

you can just use "comtype LZ77WII":

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comtype LZ77WII
get SIZE asize
math SIZE -= 4
clog "name.dat" 4 SIZE SIZE

the reason of the -4 is that the original code checks for the LZ77 signature while this one has CMPR

or use just comtype lz77wii_raw10 specifiying get SIZE threebyte

[finale00]

Alright, it works

[finale00]

Here's another game FF4 DS which uses lz77 compression also (well, the ones with 0x10 tag anyways)

It starts with 0x10, followed by the uncompressed size, followed by data.

So I try the same thing:

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comtype LZ77WII
get SIZE asize
get NAME filename
clog NAME 0 SIZE SIZE

But it doesn't decompress to the correct output size lol

This one works though:

Code: Select all

comtype LZ77WII_raw10
get type byte
get SIZE threebyte
get ZSIZE asize
math ZSIZE -= 4
get NAME filename
clog NAME 4 ZSIZE SIZE

What's wrong with the first one I wrote?

[johnsonjeven]

LZF is conceptually very similar to LZ77. Generally speaking most modern compression algorithms give roughly the same compression, and with regard to the number of cores that you can use at once, it is up to you to decide how many you want to use. Generally speaking (unless you are creating large archives) there is no reason to need more than one though. In addition, with multiple cores doing the compression, the bottleneck may become the hard drive. Legacy zip compression is akin to the Deflate method in 7-zip, and will offer the most compatibility between different compression software.

John