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use std::{
fs::File,
path::Path,
sync::Mutex,
net::ToSocketAddrs,
io::{Seek, SeekFrom, BufReader},
collections::{HashMap, HashSet},
};
use binread::{
BinRead,
FilePtr64,
BinResult,
BinReaderExt,
io::Cursor,
};
use crate::{Hash40, FileNode, FileSystem, CompressedFileSystem};
use crate::hash_labels::HashLabels;
use crate::filesystem::HashToIndex;
pub trait SeekRead: std::io::Read + std::io::Seek {}
impl<R: std::io::Read + std::io::Seek> SeekRead for R {}
#[derive(BinRead)]
#[br(magic = 0xABCDEF9876543210_u64)]
pub struct ArcFile {
pub stream_section_offset: u64,
pub file_section_offset: u64,
pub shared_section_offset: u64,
#[br(parse_with = FilePtr64::parse)]
#[br(map = |x: CompressedFileSystem| x.0)]
pub file_system: FileSystem,
pub patch_section: u64,
#[br(calc = Mutex::new(Box::new(Cursor::new([])) as _))]
pub reader: Mutex<Box<dyn SeekRead>>,
#[cfg(feature = "dir-listing")]
#[br(calc = generate_dir_listing(&file_system))]
pub dirs: HashMap<Hash40, Vec<FileNode>>,
}
#[cfg(feature = "dir-listing")]
fn parents_of_dir(dir: Hash40, labels: &mut HashLabels) -> Option<Vec<(Hash40, FileNode)>> {
let label = dir.label(&labels)?.to_owned();
let mut label = &label[..];
let mut hashes = Vec::new();
let mut last_hash = dir;
while let Some(len) = label.trim_end_matches('/').rfind('/') {
label = &label[..len];
let hash = labels.add_label(label);
hashes.push((hash, FileNode::Dir(last_hash)));
last_hash = hash;
}
hashes.push((crate::hash40::hash40("/"), FileNode::Dir(last_hash)));
Some(hashes)
}
#[cfg(feature = "dir-listing")]
fn dir_listing_flat<'a>(fs: &'a FileSystem, labels: &'a mut HashLabels) -> impl Iterator<Item = (Hash40, FileNode)> + 'a {
let dirs: HashSet<_> = fs.file_paths.iter().map(|path| path.parent.hash40()).collect();
let mut stream_dirs = Vec::new();
for path_hash in fs.stream_hash_to_entries.iter().map(HashToIndex::hash40) {
if let Some(label) = path_hash.label(&labels).and_then(|label| label.rfind('/').map(|pos| label[..pos].to_owned())) {
let mut label = &label[..];
let mut last_hash = crate::hash40::hash40(label);
labels.add_label(label);
while let Some(len) = label.trim_end_matches('/').rfind('/') {
label = &label[..len];
let hash = labels.add_label(label);
stream_dirs.push((hash, FileNode::Dir(last_hash)));
last_hash = hash;
}
stream_dirs.push((crate::hash40::hash40("/"), FileNode::Dir(last_hash)));
labels.add_label(label);
}
}
let stream_paths: Vec<(Hash40, &str)> = fs.stream_hash_to_entries.iter().filter_map(|entry| entry.hash40().label(labels).map(|path| (entry.hash40(), path))).collect();
let stream_files: Vec<(Hash40, FileNode)> = stream_paths.iter().flat_map(|(path_hash, path)| {
path.rfind('/')
.map(|pos| {
let dir = crate::hash40::hash40(&path[..pos]);
(dir, FileNode::File(*path_hash))
})
}).collect();
let dirs = dirs.into_iter()
.filter_map(move |dir| parents_of_dir(dir, labels).map(|x| x.into_iter()))
.flatten();
fs.file_paths.iter()
.map(|path| (path.parent.hash40(), FileNode::File(path.path.hash40())))
.chain(dirs)
.chain(stream_files.into_iter())
.chain(stream_dirs.into_iter())
}
#[cfg(feature = "dir-listing")]
fn generate_dir_listing(fs: &FileSystem) -> HashMap<Hash40, Vec<FileNode>> {
let mut dirs = HashMap::new();
let mut labels = crate::hash_labels::GLOBAL_LABELS.write();
for (parent, child) in dir_listing_flat(fs, &mut labels) {
let listing = dirs.entry(parent).or_insert_with(Vec::new);
match listing.binary_search(&child) {
Ok(_) => (),
Err(insert_point) => listing.insert(insert_point, child)
}
}
dirs
}
impl ArcFile {
pub fn open<P: AsRef<Path>>(path: P) -> BinResult<Self> {
Self::from_reader(BufReader::new(File::open(path)?))
}
#[cfg(feature = "network")]
pub fn open_over_network<Addr: ToSocketAddrs>(ip: Addr) -> BinResult<Self> {
let mut reader = BufReader::new(network_reader::NetworkReader::new(ip)?);
reader.seek(SeekFrom::Start(0))?;
Self::from_reader(reader)
}
pub fn from_reader<R: SeekRead + 'static>(mut reader: R) -> BinResult<Self> {
let arc: Self = reader.read_le()?;
*arc.reader.lock().unwrap() = Box::new(reader);
Ok(arc)
}
#[cfg(feature = "dir-listing")]
pub fn get_dir_listing<Hash: Into<Hash40>>(&self, hash: Hash) -> Option<&[FileNode]> {
self.dirs.get(&hash.into()).map(AsRef::as_ref)
}
}
#[cfg(test)]
mod tests {
use super::*;
fn print_tree_hash(arc: &ArcFile, hash: Hash40, depth: usize) {
for file in arc.get_dir_listing(hash).unwrap() {
(0..depth).for_each(|_| print!(" "));
match file {
FileNode::File(file) => {
println!("L {}", file.global_label().unwrap_or_else(|| format!("{:#x}", file.as_u64())));
}
FileNode::Dir(dir) => {
println!("L {}", dir.global_label().unwrap_or_else(|| format!("{:#x}", dir.as_u64())));
}
}
}
}
fn print_tree(arc: &ArcFile, dir: &str) {
println!("{}:", dir);
print_tree_hash(arc, dir.into(), 1);
}
#[test]
fn test_listing() {
Hash40::set_global_labels_file("/home/jam/Downloads/hashes.txt");
let arc = ArcFile::open("/home/jam/re/ult/900/data.arc").unwrap();
print_tree(&arc, "/");
}
#[test]
fn test_stream_listing() {
Hash40::set_global_labels_file("/home/jam/Downloads/hashes.txt");
let arc = ArcFile::open("/home/jam/re/ult/900/data.arc").unwrap();
print_tree(&arc, "stream:");
}
}