1 files changed, 104 insertions, 0 deletions
diff --git a/libs/bsa_ffi/src/archive/tes3_reader.rs b/libs/bsa_ffi/src/archive/tes3_reader.rs
new file mode 100644
index 0000000..c03f155
--- /dev/null
+++ b/libs/bsa_ffi/src/archive/tes3_reader.rs
@@ -0,0 +1,104 @@
+//! 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)
+}