Problems reading Tower Unite pak file

[abb128]

I'm trying to mount the pak file for Tower Unite. Although I can access folders and see filenames, I'm unable to actually read any files (it just says Input/output error).

$ ls ~/pak_mnt/Tower/Content/Maps | wc -l
708
$ cat ~/pak_mnt/Tower/Content/Maps/C_Condo.uexp
cat: /home/user/pak_mnt/Tower/Content/Maps/C_Condo.uexp: Input/output error

I've been able to use the Python script to mount the same pak no issues (I had to force version 7 because 5 wasn't supported and it seemed to work to some extent)

I looked deeper and found that the error is being triggered here. The value of error was Custom { kind: InvalidInput, error: "corrupt deflate stream" }

rust-u4pak/src/mount.rs

Lines 464 to 466 in 458eb6d

	if let Err(error) = zlib.read_exact(&mut out_buffer[index..]) {
	return reply.error(error.raw_os_error().unwrap_or(EIO));
	}

I also tried running the check command and it seemed to throw a lot of errors

$ u4pak info ./pakchunk0-WindowsNoEditor.pak
Pak Version: 5
Mount Point: ../../../

                      Count         Size     Uncompr.
-----------------------------------------------------
Files:               105045  16096317902  32238452739
Uncompr.:              2235    631536248
ZLIB Compr.:         102810  15464781654  31606916491
Bias Speed Compr.:        0            0            0
Bias Memory Compr.:       0            0            0
Unknown Compr.:           0            0            0
Encrypted:                0            0            0

$ u4pak check pakchunk0-WindowsNoEditor.pak 2> check.txt
Found 669319 error(s)

The final output is 115 megabytes, I've compressed it to a 15MB zip: check.zip

The game seems to run fine, umodel can read it, and the Python script can read it as well, so I don't think the pak file itself is corrupted.

[Xenira]

Can you tell me which UE version this game is using?

[abb128]

My best guess is UE 4.20? Considering the pak version, and umodel lists it as UE 4.20 as well on the compatibility matrix. I tried checking the EXE metadata and dumping strings from the EXE and memory, but I haven't found anything to confirm this.

I did try the --force-version flag with a bunch of different versions when mounting, but they all either failed instantly or kept throwing the same Input/output errors when reading files. Version 7 in particular fails to mount with rust-u4pak, but seems to work with the Python script:

$ u4pak mount pakchunk0-WindowsNoEditor.pak --debug ~/pak_mnt --force-version 7
illegal index offset/size: index_offset (16174326128) + index_size (22012867) > footer_offset (16196338979)
$ python3 ~/Documents/u4pak/u4pak.py mount pakchunk0-WindowsNoEditor.pak -f ~/pak_mnt --force-version 7

I'm noticing that the Python script doesn't work completely with this configuration though, files are missing from directory listings (C_Condo isn't even listed but it can be read if I request):

$ ls ~/pak_mnt/Tower/Content/Maps | wc -l
76
$ ls ~/pak_mnt/Tower/Content/Maps | grep -i C_Condo
$ ls ~/pak_mnt/Tower/Content/Maps/C_Condo.uexp
/home/user/pak_mnt/Tower/Content/Maps/C_Condo.uexp
$ cat ~/pak_mnt/Tower/Content/Maps/C_Condo.uexp | wc
 101885  701721 93917957

[Xenira]

Usually the "Corrupt deflate stream" error indicates that something went wrong with the alignment of compression blocks.
This might be related to #21. Can you try building from source?

[abb128]

Sorry, forgot to mention that I did indeed build from source (1.4.0) and I also did try release 1.3.0, both of them produce the same problem.

[Xenira]

Hmmm, hard to debug, as I don't own the game. Ill do some testing and see if I can find something.