Hi guys, someone can create for me a decoder to decode this file or maybe a bms script?
https://drive.google.com/file/d/12SOsJxcs7536JSJ2iv_nbcAJL7SUopim/view?usp=drive_link
There is some visble strings of uncompressed content. The original algorithm is the yz2, but this game version uses a custom compression, maybe an lzss variant. I have the encoder and decoder for the yz2, but for this game the yz2 compression has been replaced with a custom compression as I said.

I can read the zsize and unpacked size fields from header with this C code:
#include <stdio.h>
#include <stdint.h>

int read_header(FILE *fp, uint32_t *packed_size, uint32_t *unpacked_size)
{
char hdr[33];

if (fread(hdr, 1, 32, fp) != 32)
return -1;

hdr[32] = '\0';

unsigned int a, b;

if (sscanf(hdr, "%x%x", &a, &b) != 2)
return -1;

*packed_size = a;
*unpacked_size = b;

return 0;
}

Edited June 3Jun 3 by Alpha 1001

from a bit of trial and error LZO1X doesn't seem too bad but I'll need the executable

Here the executable: https://drive.google.com/file/d/1uNtUpMyFZLqc2AnjjunMzX58fEg3mdRQ/view?usp=drivesdk

more sample files please and also a decompressor for yz2

Here the samples: https://drive.google.com/file/d/1Z5yF4f7nrojuPYyZmeV1VX2ZbJ-AXNVP/view?usp=drivesdk

and here an yz2 encoder/decoder: https://github.com/RayneDuarte/YZ2-Encoder-and-Decoder-ported-to-modern-Cpp-Builder-12

Hello, do you think you can make a decompressor from the executable?

oh it's actually just LZO1X lol, added support:

https://github.com/smiRaphi/UniPyX/commit/10b71fe85dbc064334ff472caadb6525fb1b5b85

Thanks a lot!