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//! TES3 (Morrowind) BSA reading
use anyhow::{bail, Context, Result};
use ba2::tes3::{Archive, File as Tes3File};
use ba2::{ByteSlice, Reader};
use rayon::prelude::*;
use std::collections::HashSet;
use std::path::Path;
use std::sync::atomic::{AtomicUsize, Ordering};
use tracing::debug;
use super::BsaFileEntry;
/// List all files in a TES3 (Morrowind) BSA archive
pub fn list_files(bsa_path: &Path) -> Result<Vec<BsaFileEntry>> {
let archive: Archive = Archive::read(bsa_path)
.with_context(|| format!("Failed to open TES3 BSA: {}", bsa_path.display()))?;
let mut files = Vec::new();
for (key, _file) in archive.iter() {
let path = String::from_utf8_lossy(key.name().as_bytes()).to_string();
files.push(BsaFileEntry { path });
}
debug!(
"Listed {} files in TES3 BSA {}",
files.len(),
bsa_path.display()
);
Ok(files)
}
/// Extract a single file from a TES3 (Morrowind) BSA archive
#[allow(dead_code)]
pub fn extract_file(bsa_path: &Path, file_path: &str) -> Result<Vec<u8>> {
let archive: Archive = Archive::read(bsa_path)
.with_context(|| format!("Failed to open TES3 BSA: {}", bsa_path.display()))?;
// Normalize path separators
let normalized = file_path.replace('/', "\\");
// Search case-insensitively
for (key, file) in archive.iter() {
let current_path = String::from_utf8_lossy(key.name().as_bytes());
if current_path.eq_ignore_ascii_case(&normalized) {
// TES3 BSAs are uncompressed, so just return the raw bytes
return Ok(file.as_bytes().to_vec());
}
}
bail!(
"File not found in TES3 BSA: {} (looking for '{}')",
bsa_path.display(),
file_path
)
}
/// Extract multiple files from a TES3 BSA archive in parallel.
/// Opens the archive once, collects matching entries, then writes
/// them in parallel using rayon.
/// `wanted` should contain lowercase backslash-separated paths.
pub fn extract_files_batch<F>(
bsa_path: &Path,
wanted: &HashSet<String>,
callback: F,
) -> Result<usize>
where
F: Fn(&str, Vec<u8>) -> Result<()> + Send + Sync,
{
let archive: Archive = Archive::read(bsa_path)
.with_context(|| format!("Failed to open TES3 BSA: {}", bsa_path.display()))?;
// Collect matching entries
let mut entries: Vec<(String, &Tes3File)> = Vec::new();
for (key, file) in archive.iter() {
let path = String::from_utf8_lossy(key.name().as_bytes()).to_string();
let lookup = path.to_lowercase();
if wanted.contains(&lookup) {
entries.push((path, file));
}
}
// Write in parallel
let extracted = AtomicUsize::new(0);
entries
.par_iter()
.try_for_each(|(path, file)| -> Result<()> {
callback(path, file.as_bytes().to_vec())?;
extracted.fetch_add(1, Ordering::Relaxed);
Ok(())
})?;
let count = extracted.load(Ordering::Relaxed);
debug!(
"Batch extracted {} of {} wanted files from TES3 BSA {}",
count,
wanted.len(),
bsa_path.display()
);
Ok(count)
}
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