Add parser for *SETTING.DAT files

src/bin/rekordcrate-setting.rs

@@ -0,0 +1,17 @@
+// Copyright (c) 2022 Jan Holthuis
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy
+// of the MPL was not distributed with this file, You can obtain one at
+// http://mozilla.org/MPL/2.0/.
+//
+// SPDX-License-Identifier: MPL-2.0
+
+use rekordcrate::setting::Setting;
+
+fn main() {
+    let path = std::env::args().nth(1).expect("no path given");
+    let data = std::fs::read(&path).expect("failed to read file");
+    let (_, setting) = Setting::parse(&data).expect("failed to parse setting file");
+
+    println!("{:#04x?}", setting);
+}

src/lib.rs

@@ -25,4 +25,5 @@
 
 pub mod anlz;
 pub mod pdb;
+pub mod setting;
 pub mod util;

src/setting.rs

@@ -0,0 +1,86 @@
+// Copyright (c) 2022 Jan Holthuis
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy
+// of the MPL was not distributed with this file, You can obtain one at
+// http://mozilla.org/MPL/2.0/.
+//
+// SPDX-License-Identifier: MPL-2.0
+
+//! Parser for Rekordbox `*SETTING.DAT` files.
+//!
+//! These files either in the `PIONEER` directory of a USB drive (device exports), but are also
+//! present for on local installations of Rekordbox 6 in `%APPDATA%\Pioneer\rekordbox6`.
+//!
+//! The settings files store the settings found on the "DJ System" > "My Settings" page of the
+//! Rekordbox preferences. These includes language, LCD brightness, tempo fader range, crossfader
+//! curve, etc.
+//!
+//! The exact format still has to be reverse-engineered.
+
+use crate::util::nom_input_error_with_kind;
+use nom::error::ErrorKind;
+use nom::IResult;
+
+#[derive(Debug)]
+/// Represents a setting file.
+pub struct Setting {
+    /// Size of the string data field (should be always 96).
+    pub len_stringdata: u32,
+    /// Name of the company ("PIONEER").
+    pub company: String,
+    /// Name of the software ("rekordbox").
+    pub software: String,
+    /// Some kind of version number.
+    pub version: String,
+    /// Size of the `unknown1` data in bytes.
+    pub len_unknown1: u32,
+    /// Unknown field.
+    pub unknown1: Vec<u8>,
+    /// Unknown field.
+    pub unknown2: u32,
+}
+
+impl Setting {
+    /// Parses the Setting file and returns the structure.
+    pub fn parse(input: &[u8]) -> IResult<&[u8], Self> {
+        let (input, len_stringdata) = nom::number::complete::le_u32(input)?;
+        let len_stringdatasection = (len_stringdata as usize) / 3;
+        let (input, company) = nom::bytes::complete::take(len_stringdatasection)(input)?;
+        let company = std::str::from_utf8(company)
+            .unwrap()
+            .trim_end_matches('\0')
+            .to_owned();
+        let (input, software) = nom::bytes::complete::take(len_stringdatasection)(input)?;
+        let software = std::str::from_utf8(software)
+            .unwrap()
+            .trim_end_matches('\0')
+            .to_owned();
+        let (input, version) = nom::bytes::complete::take(len_stringdatasection)(input)?;
+        let version = std::str::from_utf8(version)
+            .unwrap()
+            .trim_end_matches('\0')
+            .to_owned();
+
+        let (input, len_unknown1) = nom::number::complete::le_u32(input)?;
+        let (input, unknown1) = nom::bytes::complete::take(len_unknown1 as usize)(input)?;
+        let unknown1 = unknown1.to_vec();
+
+        let (input, unknown2) = nom::number::complete::le_u32(input)?;
+        if !input.is_empty() {
+            return Err(nom_input_error_with_kind(input, ErrorKind::Complete));
+        }
+
+        Ok((
+            input,
+            Self {
+                len_stringdata,
+                company,
+                software,
+                version,
+                len_unknown1,
+                unknown1,
+                unknown2,
+            },
+        ))
+    }
+}