libgm 0.6.0

A tool for unpacking and modding GameMaker games
Documentation 
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use super::target_version;
use crate::prelude::*;
use crate::wad::GMVersion;
use crate::wad::deserialize::reader::DataReader;

pub fn check_2_3_1(reader: &mut DataReader) -> Result<Option<GMVersion>> {
    let ver = target_version!(2, 3);
    reader.read_gms2_chunk_version("ACRV Version")?;
    let count = reader.read_u32()?;
    if count < 1 {
        return Ok(None);
    }

    // Go to the first "point"
    reader.cur_pos = reader.read_u32()? + 8;

    // In 2.3 an int with the value of 0 would be set here, it cannot be version 2.3
    // if this value isn't 0.
    if reader.read_u32()? != 0 {
        return ver;
    }

    // At all points (besides the first one) if BezierX0 equals to 0 (the above
    // check) then BezierY0 equals to 0 as well (the current check)
    if reader.read_u32()? == 0 {
        return ver;
    }

    Ok(None)
}