1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77

use std::path::PathBuf;
use std::{
    cmp,
    fmt::Display,
    io::{self, Read, Seek, Write},
    path::{Path, MAIN_SEPARATOR_STR},
};

use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
use cfb::{CompoundFile, Stream};

#[derive(Debug, Clone, PartialEq)]
pub struct Version(u32);
impl Version {
    pub fn new(version: u32) -> Self {
        Version(version)
    }

    pub fn u32(&self) -> u32 {
        self.0
    }

    fn version_float(&self) -> f32 {
        (self.0 as f32) / 100f32
    }
}
impl Display for Version {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let version_float = self.version_float();
        write!(f, "{}", version_float)
    }
}
impl From<Version> for u32 {
    fn from(val: Version) -> Self {
        val.0
    }
}
impl cmp::PartialOrd for Version {
    fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
        self.0.partial_cmp(&other.0)
    }
}

fn vpx_version_path() -> PathBuf {
    Path::new(MAIN_SEPARATOR_STR)
        .join("GameStg")
        .join("Version")
}

pub(crate) fn read_version<F: Read + Seek>(comp: &mut CompoundFile<F>) -> io::Result<Version> {
    let version_path = vpx_version_path();
    let mut stream = comp.open_stream(version_path)?;
    read_version_data(&mut stream)
}

pub(crate) fn write_version<F: Read + Write + Seek>(
    comp: &mut CompoundFile<F>,
    version: &Version,
) -> io::Result<()> {
    // we expect GameStg to exist
    let version_path = vpx_version_path();
    let mut stream = comp.create_stream(version_path)?;
    write_version_data(version, &mut stream)
}

fn read_version_data<F: Read + Seek>(stream: &mut Stream<F>) -> io::Result<Version> {
    let version = stream.read_u32::<LittleEndian>()?;
    Ok(Version(version))
}

fn write_version_data<F: Read + Write + Seek>(
    version: &Version,
    stream: &mut Stream<F>,
) -> io::Result<()> {
    stream.write_u32::<LittleEndian>(version.0)?;
    Ok(())
}