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|
use encoding_rs::WINDOWS_1251;
use std::fmt;
use std::fs;
use std::path::Path;
const MIN_SIZE: usize = 0x48;
const MAGIC: u32 = 0x0000_F0F1;
pub type Result<T> = core::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
Io(std::io::Error),
TooSmall { got: usize },
InvalidMagic { got: u32 },
MissingArchiveName,
MissingModelKey,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Io(err) => write!(f, "{err}"),
Self::TooSmall { got } => write!(f, "unit .dat is too small: {got} bytes"),
Self::InvalidMagic { got } => write!(f, "invalid .dat magic: 0x{got:08X}"),
Self::MissingArchiveName => write!(f, "unit .dat has empty archive name"),
Self::MissingModelKey => write!(f, "unit .dat has empty model key"),
}
}
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Self::Io(err) => Some(err),
_ => None,
}
}
}
impl From<std::io::Error> for Error {
fn from(value: std::io::Error) -> Self {
Self::Io(value)
}
}
#[derive(Clone, Debug)]
pub struct UnitDat {
pub magic: u32,
pub flags: u32,
pub archive_name: String,
pub model_key: String,
}
pub fn parse_path(path: impl AsRef<Path>) -> Result<UnitDat> {
let bytes = fs::read(path.as_ref())?;
parse_bytes(&bytes)
}
pub fn parse_bytes(bytes: &[u8]) -> Result<UnitDat> {
if bytes.len() < MIN_SIZE {
return Err(Error::TooSmall { got: bytes.len() });
}
let magic = read_u32(bytes, 0).ok_or(Error::TooSmall { got: bytes.len() })?;
if magic != MAGIC {
return Err(Error::InvalidMagic { got: magic });
}
let flags = read_u32(bytes, 4).ok_or(Error::TooSmall { got: bytes.len() })?;
let archive_name = decode_c_string_fixed(&bytes[0x08..0x28]);
if archive_name.is_empty() {
return Err(Error::MissingArchiveName);
}
let model_key = decode_c_string_fixed(&bytes[0x28..0x48]);
if model_key.is_empty() {
return Err(Error::MissingModelKey);
}
Ok(UnitDat {
magic,
flags,
archive_name,
model_key,
})
}
fn read_u32(bytes: &[u8], offset: usize) -> Option<u32> {
let end = offset.checked_add(4)?;
let chunk = bytes.get(offset..end)?;
Some(u32::from_le_bytes(chunk.try_into().ok()?))
}
fn decode_c_string_fixed(bytes: &[u8]) -> String {
let used = bytes.iter().position(|&b| b == 0).unwrap_or(bytes.len());
let (decoded, _, _) = WINDOWS_1251.decode(&bytes[..used]);
decoded.trim().to_string()
}
#[cfg(test)]
mod tests {
use super::*;
use common::collect_files_recursive;
use std::path::{Path, PathBuf};
fn game_root() -> Option<PathBuf> {
let root = Path::new(env!("CARGO_MANIFEST_DIR"))
.join("..")
.join("..")
.join("testdata")
.join("Parkan - Iron Strategy");
root.is_dir().then_some(root)
}
#[test]
fn parses_known_dat_files() {
let Some(root) = game_root() else {
eprintln!("skipping: game root missing");
return;
};
let samples = [
root.join("UNITS/UNITS/HERO/tut1_p.dat"),
root.join("UNITS/UNITS/BATTLE/l_targ.dat"),
root.join("UNITS/BUILDS/BRIDGE/m_bridge.dat"),
];
for path in samples {
if !path.is_file() {
eprintln!("skipping missing sample {}", path.display());
continue;
}
let dat = parse_path(&path)
.unwrap_or_else(|err| panic!("failed to parse {}: {err}", path.display()));
assert_eq!(dat.magic, MAGIC);
assert!(dat.archive_name.to_ascii_lowercase().ends_with(".rlb"));
assert!(dat.model_key.contains('_'));
}
}
#[test]
fn parses_retail_dat_corpus() {
let Some(root) = game_root() else {
eprintln!("skipping: game root missing");
return;
};
let units_root = root.join("UNITS");
let mut files = Vec::new();
collect_files_recursive(&units_root, &mut files);
files.sort();
let mut parsed = 0usize;
for path in files {
if !path
.extension()
.and_then(|ext| ext.to_str())
.is_some_and(|ext| ext.eq_ignore_ascii_case("dat"))
{
continue;
}
let dat = parse_path(&path)
.unwrap_or_else(|err| panic!("failed to parse {}: {err}", path.display()));
assert!(
!dat.archive_name.is_empty(),
"{} empty archive",
path.display()
);
assert!(
!dat.model_key.is_empty(),
"{} empty model key",
path.display()
);
parsed += 1;
}
assert!(parsed > 0, "no .dat files parsed");
}
}
|
