commit ff20a333046c3dbc6c1a47ae72f29660c36d8caa
Author: Patrick Auernig <patrick.auernig@mykolab.com>
Date:   Sun Jul 30 22:54:43 2023 +0200

    Implement save file parser for journey

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..d2e397c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,390 @@
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+# It is not intended for manual editing.
+version = 3
+
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..75e6eb0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/save",
+]
+
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+
diff --git a/crates/save/Cargo.toml b/crates/save/Cargo.toml
new file mode 100644
index 0000000..b0c9945
--- /dev/null
+++ b/crates/save/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "jrny-save"
+version.workspace = true
+edition.workspace = true
+
+
+[dependencies]
+binrw = "0.11"
+chrono = "0.4"
+urlencoding = "2.1"
diff --git a/crates/save/src/companion.rs b/crates/save/src/companion.rs
new file mode 100644
index 0000000..87d3c7b
--- /dev/null
+++ b/crates/save/src/companion.rs
@@ -0,0 +1,130 @@
+use std::io::SeekFrom;
+
+use binrw::{BinRead, NullString};
+
+
+#[derive(Debug)]
+pub struct Companions(Vec<CompanionWithId>);
+
+impl Companions {
+    pub fn iter(&self) -> std::slice::Iter<CompanionWithId> {
+        self.0.iter()
+    }
+
+    pub fn count(&self) -> usize {
+        self.0.len()
+    }
+}
+
+impl BinRead for Companions {
+    type Args<'a> = ();
+
+    fn read_options<R>(
+        reader: &mut R,
+        endian: binrw::Endian,
+        _args: Self::Args<'_>,
+    ) -> binrw::BinResult<Self>
+    where
+        R: std::io::Read + std::io::Seek,
+    {
+        let mut companions = Vec::new();
+
+        loop {
+            let mut marker = [0u8; 4];
+            reader.seek(SeekFrom::Current(28))?;
+            reader.read_exact(&mut marker)?;
+            reader.seek(SeekFrom::Current(-32))?;
+
+            if marker != [0x01, 0x00, 0x10, 0x01] {
+                break;
+            }
+
+            let companion: CompanionWithId = <_>::read_options(reader, endian, ())?;
+            reader.seek(SeekFrom::Current(4))?;
+
+            companions.push(companion);
+        }
+
+        Ok(Self(companions))
+    }
+}
+
+
+#[derive(Debug)]
+pub struct CompanionSymbols(Vec<CompanionWithSymbol>);
+
+impl CompanionSymbols {
+    pub fn iter(&self) -> std::slice::Iter<CompanionWithSymbol> {
+        self.0.iter()
+    }
+
+    pub fn count(&self) -> usize {
+        self.0.len()
+    }
+}
+
+impl BinRead for CompanionSymbols {
+    type Args<'a> = ();
+
+    fn read_options<R>(
+        reader: &mut R,
+        endian: binrw::Endian,
+        _args: Self::Args<'_>,
+    ) -> binrw::BinResult<Self>
+    where
+        R: std::io::Read + std::io::Seek,
+    {
+        let mut companions = Vec::new();
+
+        loop {
+            let companion: CompanionWithSymbol = <_>::read_options(reader, endian, ())?;
+
+            if companion.name.is_empty() {
+                reader.seek(SeekFrom::Current(-60))?;
+                break;
+            }
+
+            companions.push(companion);
+        }
+
+        let padding = 960 - (companions.len() * 60);
+        reader.seek(SeekFrom::Current(padding as i64))?;
+
+        Ok(Self(companions))
+    }
+}
+
+
+#[derive(Debug, BinRead)]
+pub struct CompanionWithId {
+    #[brw(pad_size_to = 24, map = |raw: NullString| raw.to_string())]
+    pub name: String,
+
+    #[brw(assert(steam_id != 0))]
+    pub steam_id: u32,
+}
+
+impl CompanionWithId {
+    pub fn steam_id_v3(&self) -> String {
+        format!("[U:1:{}]", self.steam_id)
+    }
+
+    pub fn steam_url(&self) -> String {
+        let steam_id = self.steam_id_v3();
+        let encoded_steam_id = urlencoding::encode(&steam_id);
+        format!("https://steamcommunity.com/profiles/{}", encoded_steam_id)
+    }
+}
+
+
+#[derive(Debug, BinRead)]
+pub struct CompanionWithSymbol {
+    #[brw(pad_size_to = 52, map = |raw: NullString| raw.to_string())]
+    pub name: String,
+
+    #[brw(count = 4)]
+    _unknown1: Vec<u8>,
+
+    #[brw(assert((0..=21).contains(&symbol)))]
+    pub symbol: u32,
+}
diff --git a/crates/save/src/glyphs.rs b/crates/save/src/glyphs.rs
new file mode 100644
index 0000000..8e3e7fa
--- /dev/null
+++ b/crates/save/src/glyphs.rs
@@ -0,0 +1,51 @@
+use binrw::BinRead;
+
+
+#[derive(Debug, BinRead)]
+pub struct Glyphs(#[brw(count = 6)] Vec<LevelGlyphs>);
+
+impl Glyphs {
+    const COUNT: [usize; 6] = [3, 3, 4, 3, 4, 4];
+
+    pub fn all<'a>(&'a self) -> impl Iterator<Item = (usize, Vec<bool>)> + 'a {
+        self.0.iter().enumerate().map(|(level, glyphs)| {
+            let glyphs = (0..Self::COUNT[level])
+                .into_iter()
+                .map(|glyph_idx| glyphs.has_collected(glyph_idx).unwrap())
+                .collect();
+
+            (level, glyphs)
+        })
+    }
+
+    pub fn count(&self) -> usize {
+        self.0.len()
+    }
+
+    pub fn has_collected(&self, level: usize, index: usize) -> Option<bool> {
+        if level >= self.0.len() {
+            return None;
+        }
+
+        self.0[level].has_collected(index)
+    }
+}
+
+
+#[derive(Debug, BinRead)]
+pub struct LevelGlyphs {
+    status_flags: u8,
+
+    #[brw(count = 343)]
+    _unused: Vec<u8>,
+}
+
+impl LevelGlyphs {
+    pub fn has_collected(&self, index: usize) -> Option<bool> {
+        if index > 8 {
+            return None;
+        }
+
+        Some(((self.status_flags >> index) & 0x01) == 0x01)
+    }
+}
diff --git a/crates/save/src/lib.rs b/crates/save/src/lib.rs
new file mode 100644
index 0000000..ce0fed3
--- /dev/null
+++ b/crates/save/src/lib.rs
@@ -0,0 +1,168 @@
+mod companion;
+mod glyphs;
+mod murals;
+mod test;
+
+
+use core::fmt;
+use std::io::Read;
+
+use binrw::{BinRead, BinReaderExt};
+use chrono::{DateTime, NaiveDateTime, Utc};
+
+use crate::companion::{CompanionSymbols, CompanionWithId, Companions};
+use crate::glyphs::Glyphs;
+use crate::murals::Murals;
+
+
+pub const LEVEL_NAMES: [&str; 12] = [
+    "Chapter Select",
+    "Broken Bridge",
+    "Pink Desert",
+    "Sunken City",
+    "Underground",
+    "Tower",
+    "Snow",
+    "Paradise",
+    "Credits",
+    "Level Bryan",
+    "Level Matt",
+    "Level Chris",
+];
+
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum RobeColor {
+    Red,
+    White,
+}
+
+impl fmt::Display for RobeColor {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Red => write!(f, "Red"),
+            Self::White => write!(f, "White"),
+        }
+    }
+}
+
+
+#[binrw::binread]
+#[derive(Debug)]
+#[brw(little, magic = b"\x16\x00\x00\x80\x00\x00\x00\x00")]
+pub struct Savefile {
+    pub robe: u32,
+
+    pub symbol: u32,
+
+    pub scarf_length: u32,
+
+    #[brw(count = 4)]
+    _unknown1: Vec<u8>,
+
+    #[brw(assert(current_level <= 12))]
+    pub current_level: u64,
+
+    pub total_collected_symbols: u32,
+
+    #[brw(assert(collected_symbols <= 21))]
+    pub collected_symbols: u32,
+
+    pub murals: Murals,
+
+    #[brw(count = 22)]
+    _unknown2: Vec<u8>,
+
+    #[brw(parse_with = parse_last_played)]
+    pub last_played: DateTime<Utc>,
+
+    #[brw(count = 4)]
+    _unknown3: Vec<u8>,
+
+    pub journey_count: u64,
+
+    pub glyphs: Glyphs,
+
+    #[brw(count = 2404)]
+    _unknown4: Vec<u8>,
+
+    pub companion_symbols: CompanionSymbols,
+
+    pub companions_met: u32,
+
+    #[brw(count = 1024)]
+    _unknown6: Vec<u8>,
+
+    pub total_companions_met: u32,
+
+    #[brw(count = 24)]
+    _unknown7: Vec<u8>,
+
+    pub companions: Companions,
+}
+
+impl Savefile {
+    pub fn from_reader<R>(mut reader: R) -> std::io::Result<Self>
+    where
+        R: Read + BinReaderExt,
+    {
+        // TODO: implement error type
+        Ok(reader.read_le().unwrap())
+    }
+
+    pub fn current_companions<'a>(&'a self) -> impl Iterator<Item = &'a CompanionWithId> {
+        self.companions
+            .iter()
+            .enumerate()
+            .filter_map(|(idx, item)| {
+                if idx < self.companions_met as usize {
+                    Some(item)
+                } else {
+                    None
+                }
+            })
+    }
+
+    pub fn past_companions<'a>(&'a self) -> impl Iterator<Item = &'a CompanionWithId> {
+        self.companions
+            .iter()
+            .enumerate()
+            .filter_map(|(idx, item)| {
+                if idx >= self.companions_met as usize {
+                    Some(item)
+                } else {
+                    None
+                }
+            })
+    }
+
+    pub fn current_level_name(&self) -> &'static str {
+        LEVEL_NAMES[self.current_level as usize]
+    }
+
+    pub fn robe_color(&self) -> RobeColor {
+        if self.robe > 3 {
+            RobeColor::White
+        } else {
+            RobeColor::Red
+        }
+    }
+
+    pub fn robe_tier(&self) -> u32 {
+        match self.robe_color() {
+            RobeColor::Red => self.robe + 1,
+            RobeColor::White => self.robe - 2,
+        }
+    }
+}
+
+#[binrw::parser(reader, endian)]
+fn parse_last_played() -> binrw::BinResult<DateTime<Utc>> {
+    let timestamp: i64 = <_>::read_options(reader, endian, ())?;
+    let timestamp = (timestamp / 10_000) - 11_644_473_600_000;
+
+    let datetime = NaiveDateTime::from_timestamp_millis(timestamp).unwrap();
+    let datetime = DateTime::from_utc(datetime, Utc);
+
+    Ok(datetime)
+}
diff --git a/crates/save/src/murals.rs b/crates/save/src/murals.rs
new file mode 100644
index 0000000..a41cc8b
--- /dev/null
+++ b/crates/save/src/murals.rs
@@ -0,0 +1,36 @@
+use binrw::BinRead;
+
+
+#[derive(Debug, BinRead)]
+pub struct Murals {
+    status_flags: u16,
+}
+
+impl Murals {
+    const COUNT: [usize; 7] = [1, 1, 2, 2, 1, 1, 2];
+
+    pub fn has_found(&self, level_index: usize, index: usize) -> Option<bool> {
+        if level_index > 6 {
+            return None;
+        }
+
+        if index >= Self::COUNT[level_index] {
+            return None;
+        }
+
+        let pos = Self::COUNT[0..level_index].iter().sum::<usize>();
+        let mask = 0x01 << (pos + index);
+        Some((self.status_flags & mask) == mask)
+    }
+
+    pub fn all<'a>(&'a self) -> impl Iterator<Item = (usize, Vec<bool>)> + 'a {
+        Self::COUNT.iter().enumerate().map(|(level, murals)| {
+            let murals = (0..*murals)
+                .into_iter()
+                .map(|mural| self.has_found(level, mural).unwrap())
+                .collect::<Vec<_>>();
+
+            (level, murals)
+        })
+    }
+}
diff --git a/crates/save/src/test.rs b/crates/save/src/test.rs
new file mode 100644
index 0000000..f0a066e
--- /dev/null
+++ b/crates/save/src/test.rs
@@ -0,0 +1,156 @@
+#![cfg(test)]
+
+use std::io::Cursor;
+
+use binrw::BinReaderExt;
+use chrono::NaiveDate;
+
+use crate::*;
+
+
+#[test]
+fn general_info() {
+    let savefile = savefile();
+
+    assert_eq!(savefile.robe, 3);
+    assert_eq!(savefile.robe_color(), RobeColor::Red);
+    assert_eq!(savefile.robe_tier(), 4);
+
+    assert_eq!(savefile.symbol, 7);
+    assert_eq!(savefile.scarf_length, 27);
+    assert_eq!(savefile.current_level, 1);
+    assert_eq!(savefile.total_collected_symbols, 107);
+    assert_eq!(savefile.collected_symbols, 21);
+    assert_eq!(savefile.journey_count, 21);
+    assert_eq!(savefile.companions_met, 6);
+    assert_eq!(savefile.total_companions_met, 21);
+}
+
+
+#[test]
+fn last_played() {
+    let savefile = savefile();
+
+    let expected = NaiveDate::from_ymd_opt(2023, 07, 28).unwrap();
+    let expected = expected.and_hms_milli_opt(14, 17, 45, 893).unwrap();
+
+    assert_eq!(savefile.last_played.naive_utc(), expected);
+}
+
+
+#[test]
+fn companion_info() {
+    let savefile = savefile();
+
+    assert_eq!(savefile.companions.count(), 8);
+    assert_eq!(savefile.companion_symbols.count(), 8);
+
+    for (a, b) in savefile
+        .companions
+        .iter()
+        .zip(savefile.companion_symbols.iter())
+    {
+        assert_eq!(a.name, b.name);
+    }
+
+    let companion = savefile
+        .companion_symbols
+        .iter()
+        .find(|x| x.name == "Wanderer")
+        .unwrap();
+    assert_eq!(companion.symbol, 6);
+    let companion = savefile
+        .companion_symbols
+        .iter()
+        .find(|x| x.name == "Rythulian")
+        .unwrap();
+    assert_eq!(companion.symbol, 19);
+    let companion = savefile
+        .companion_symbols
+        .iter()
+        .find(|x| x.name == "Machine")
+        .unwrap();
+    assert_eq!(companion.symbol, 20);
+}
+
+
+#[test]
+fn companion_order() {
+    let savefile = savefile();
+
+    let current = savefile.current_companions().collect::<Vec<_>>();
+    let past = savefile.past_companions().collect::<Vec<_>>();
+
+    assert_eq!(current.len(), 6);
+    assert_eq!(past.len(), 2);
+
+    assert_eq!(current[0].name, "Wanderer".to_string());
+    assert_eq!(current[1].name, "Rythulian".to_string());
+    assert_eq!(past[0].name, "Machine".to_string());
+}
+
+
+#[test]
+fn glyph_status() {
+    let savefile = savefile();
+
+    const FOUND: [&[bool]; 6] = [
+        &[true, false, true],
+        &[true, false, false],
+        &[true, false, false, true],
+        &[true, true, true],
+        &[true, false, true, true],
+        &[false, true, false, true],
+    ];
+
+    for (level_idx, level_found) in FOUND.into_iter().enumerate() {
+        for (glyph_idx, has_found) in level_found.into_iter().enumerate() {
+            assert_eq!(
+                savefile.glyphs.has_collected(level_idx, glyph_idx),
+                Some(*has_found),
+                "level {}, glyph {} is incorrect",
+                level_idx,
+                glyph_idx
+            );
+        }
+    }
+
+    assert_eq!(savefile.glyphs.has_collected(0, 69), None);
+}
+
+
+#[test]
+fn murals() {
+    let savefile = savefile();
+
+    const FOUND: [&[bool]; 7] = [
+        &[false],
+        &[false],
+        &[true, true],
+        &[false, true],
+        &[false],
+        &[true],
+        &[true, false],
+    ];
+
+    for (level_idx, level_found) in FOUND.into_iter().enumerate() {
+        for (mural_idx, has_found) in level_found.into_iter().enumerate() {
+            assert_eq!(
+                savefile.murals.has_found(level_idx, mural_idx),
+                Some(*has_found),
+                "level {}, mural {} is incorrect",
+                level_idx,
+                mural_idx
+            )
+        }
+    }
+
+    assert_eq!(savefile.murals.has_found(69, 420), None);
+}
+
+
+fn savefile() -> Savefile {
+    const TEST_FILE: &[u8] = include_bytes!("../test.bin");
+    let mut savefile = Cursor::new(TEST_FILE);
+    savefile.read_le().expect("parsing failed")
+}
diff --git a/crates/save/test.bin b/crates/save/test.bin
new file mode 100644
index 0000000..17579f6
Binary files /dev/null and b/crates/save/test.bin differ
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..8825301
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,5 @@
+[toolchain]
+channel = "1.71.0"
+components = ["rustfmt", "clippy"]
+targets = ["x86_64-unknown-linux-gnu"]
+profile = "minimal"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..b99c2a4
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,18 @@
+edition = "2021"
+
+# Just enforce it here as well instead of relying on editorconfig alone
+hard_tabs = false
+tab_spaces = 4
+newline_style = "Unix"
+
+imports_granularity = "Module"
+group_imports = "StdExternalCrate"
+
+force_multiline_blocks = false
+fn_single_line = false
+comment_width = 100
+wrap_comments = true
+hex_literal_case = "Upper"
+blank_lines_upper_bound = 2
+overflow_delimited_expr = true
+reorder_impl_items = true