Cleanup & add as_dyn to ReadStream

src/bin.rs

@@ -7,9 +7,9 @@ use std::{
 use clap::{clap_app, AppSettings};
 use file_size;
 use nod::{
-    disc::{new_disc_base, PartReadStream},
+    disc::{new_disc_base, DiscBase, PartReadStream},
     fst::NodeType,
-    io::{has_extension, new_disc_io},
+    io::{has_extension, new_disc_io, DiscIO},
     Result,
 };
 

src/disc/gcn.rs

@@ -17,7 +17,9 @@ pub(crate) struct DiscGCN {
     pub(crate) header: Header,
 }
 
-pub(crate) fn new_disc_gcn(header: Header) -> Result<DiscGCN> { Result::Ok(DiscGCN { header }) }
+impl DiscGCN {
+    pub(crate) fn new(header: Header) -> Result<DiscGCN> { Result::Ok(DiscGCN { header }) }
+}
 
 impl DiscBase for DiscGCN {
     fn get_header(&self) -> &Header { &self.header }
@@ -92,6 +94,8 @@ impl<'a> Seek for GCPartReadStream<'a> {
 
 impl<'a> ReadStream for GCPartReadStream<'a> {
     fn stable_stream_len(&mut self) -> io::Result<u64> { self.stream.stable_stream_len() }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 impl<'a> PartReadStream for GCPartReadStream<'a> {

src/disc/mod.rs

@@ -5,7 +5,7 @@ use std::{fmt::Debug, io};
 use binread::{prelude::*, BinReaderExt, NullString};
 
 use crate::{
-    disc::{gcn::new_disc_gcn, wii::new_disc_wii},
+    disc::{gcn::DiscGCN, wii::DiscWii},
     fst::{Node, NodeType},
     io::DiscIO,
     streams::{ReadStream, SharedWindowedReadStream},
@@ -113,9 +113,9 @@ pub fn new_disc_base(disc_io: &mut dyn DiscIO) -> Result<Box<dyn DiscBase>> {
     let mut stream = disc_io.begin_read_stream(0)?;
     let header: Header = stream.read_be()?;
     if header.wii_magic == 0x5D1C9EA3 {
-        Result::Ok(Box::from(new_disc_wii(stream.as_mut(), header)?))
+        Result::Ok(Box::from(DiscWii::new(stream.as_mut(), header)?))
     } else if header.gcn_magic == 0xC2339F3D {
-        Result::Ok(Box::from(new_disc_gcn(header)?))
+        Result::Ok(Box::from(DiscGCN::new(header)?))
     } else {
         Result::Err(Error::DiscFormat("Invalid GC/Wii magic".to_string()))
     }

src/disc/wii.rs

@@ -192,11 +192,13 @@ pub(crate) struct DiscWii {
     part_info: WiiPartInfo,
 }
 
-pub(crate) fn new_disc_wii(mut stream: &mut dyn ReadStream, header: Header) -> Result<DiscWii> {
+impl DiscWii {
+    pub(crate) fn new(mut stream: &mut dyn ReadStream, header: Header) -> Result<DiscWii> {
         let mut disc = DiscWii { header, part_info: stream.read_be()? };
         disc.decrypt_partition_keys()?;
         Result::Ok(disc)
     }
+}
 
 impl DiscWii {
     pub(crate) fn decrypt_partition_keys(&mut self) -> Result<()> {
@@ -401,6 +403,8 @@ impl<'a> ReadStream for WiiPartReadStream<'a> {
     fn stable_stream_len(&mut self) -> io::Result<u64> {
         io::Result::Ok(to_block_size(self.stream.stable_stream_len()?))
     }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 #[derive(Clone, Debug, PartialEq, BinRead)]

src/io/iso.rs

@@ -1,20 +1,20 @@
-use std::fs::File;
-use std::io::{Seek, SeekFrom};
-use std::io;
-use std::path::{Path, PathBuf};
+use std::{
+    fs::File,
+    io,
+    io::{Seek, SeekFrom},
+    path::{Path, PathBuf},
+};
 
-use crate::io::DiscIO;
-use crate::Result;
-use crate::streams::ReadStream;
+use crate::{io::DiscIO, streams::ReadStream, Result};
 
 pub(crate) struct DiscIOISO {
     pub(crate) filename: PathBuf,
 }
 
-pub(crate) fn new_disc_io_iso(filename: &Path) -> Result<DiscIOISO> {
-    Result::Ok(DiscIOISO {
-        filename: filename.to_owned(),
-    })
+impl DiscIOISO {
+    pub(crate) fn new(filename: &Path) -> Result<DiscIOISO> {
+        Result::Ok(DiscIOISO { filename: filename.to_owned() })
+    }
 }
 
 impl DiscIO for DiscIOISO {

src/io/mod.rs

@@ -3,7 +3,7 @@
 use std::{fs, io, path::Path};
 
 use crate::{
-    io::{iso::new_disc_io_iso, nfs::new_disc_io_nfs},
+    io::{iso::DiscIOISO, nfs::DiscIONFS},
     streams::ReadStream,
     Error, Result,
 };
@@ -21,18 +21,6 @@ pub trait DiscIO {
     fn has_wii_crypto(&self) -> bool { true }
 }
 
-/// Helper function for checking a file extension.
-#[inline(always)]
-pub fn has_extension(filename: &Path, extension: &str) -> bool {
-    if let Some(ext) = filename.extension() {
-        // TODO use with Rust 1.53+
-        // ext.eq_ignore_ascii_case(extension)
-        ext.to_str().unwrap_or("").eq_ignore_ascii_case(extension)
-    } else {
-        false
-    }
-}
-
 /// Creates a new [`DiscIO`] instance.
 ///
 /// # Examples
@@ -66,10 +54,10 @@ pub fn new_disc_io(filename: &Path) -> Result<Box<dyn DiscIO>> {
         )));
     }
     if has_extension(path, "iso") {
-        Result::Ok(Box::from(new_disc_io_iso(path)?))
+        Result::Ok(Box::from(DiscIOISO::new(path)?))
     } else if has_extension(path, "nfs") {
         if matches!(path.parent(), Some(parent) if parent.is_dir()) {
-            Result::Ok(Box::from(new_disc_io_nfs(path.parent().unwrap())?))
+            Result::Ok(Box::from(DiscIONFS::new(path.parent().unwrap())?))
         } else {
             Result::Err(Error::DiscFormat("Failed to locate NFS parent directory".to_string()))
         }
@@ -77,3 +65,15 @@ pub fn new_disc_io(filename: &Path) -> Result<Box<dyn DiscIO>> {
         Result::Err(Error::DiscFormat("Unknown file type".to_string()))
     }
 }
+
+/// Helper function for checking a file extension.
+#[inline(always)]
+pub fn has_extension(filename: &Path, extension: &str) -> bool {
+    if let Some(ext) = filename.extension() {
+        // TODO use with Rust 1.53+
+        // ext.eq_ignore_ascii_case(extension)
+        ext.to_str().unwrap_or("").eq_ignore_ascii_case(extension)
+    } else {
+        false
+    }
+}

src/io/nfs.rs

@@ -83,12 +83,14 @@ pub(crate) struct DiscIONFS {
     pub(crate) header: Option<NFSHeader>,
 }
 
-pub(crate) fn new_disc_io_nfs(directory: &Path) -> Result<DiscIONFS> {
+impl DiscIONFS {
+    pub(crate) fn new(directory: &Path) -> Result<DiscIONFS> {
         let mut disc_io =
             DiscIONFS { directory: directory.to_owned(), key: [0; 16], header: Option::None };
         disc_io.validate_files()?;
         Result::Ok(disc_io)
     }
+}
 
 pub(crate) struct NFSReadStream<'a> {
     disc_io: &'a DiscIONFS,
@@ -221,6 +223,8 @@ impl<'a> Seek for NFSReadStream<'a> {
 
 impl<'a> ReadStream for NFSReadStream<'a> {
     fn stable_stream_len(&mut self) -> io::Result<u64> { todo!() }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 impl DiscIO for DiscIONFS {

src/streams.rs

@@ -40,11 +40,16 @@ pub trait ReadStream: Read + Seek {
     /// Creates a windowed read sub-stream with offset and size.
     ///
     /// Seeks underlying stream immediately.
-    fn new_window(&mut self, offset: u64, size: u64) -> io::Result<SharedWindowedReadStream>
-    where Self: Sized {
+    fn new_window(&mut self, offset: u64, size: u64) -> io::Result<SharedWindowedReadStream> {
         self.seek(SeekFrom::Start(offset))?;
-        io::Result::Ok(SharedWindowedReadStream { base: self, begin: offset, end: offset + size })
+        io::Result::Ok(SharedWindowedReadStream {
+            base: self.as_dyn(),
+            begin: offset,
+            end: offset + size,
+        })
     }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream;
 }
 
 impl ReadStream for File {
@@ -55,6 +60,8 @@ impl ReadStream for File {
         self.seek(SeekFrom::Start(before))?;
         result
     }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 trait WindowedReadStream: ReadStream {
@@ -84,6 +91,15 @@ pub struct SharedWindowedReadStream<'a> {
     pub end: u64,
 }
 
+impl<'a> SharedWindowedReadStream<'a> {
+    pub fn set_window(&mut self, begin: u64, end: u64) -> io::Result<()> {
+        self.base.seek(SeekFrom::Start(begin))?;
+        self.begin = begin;
+        self.end = end;
+        io::Result::Ok(())
+    }
+}
+
 #[inline(always)]
 fn windowed_read(stream: &mut dyn WindowedReadStream, buf: &mut [u8]) -> io::Result<usize> {
     let pos = stream.stream_position()?;
@@ -124,6 +140,8 @@ impl<'a> Seek for OwningWindowedReadStream<'a> {
 
 impl<'a> ReadStream for OwningWindowedReadStream<'a> {
     fn stable_stream_len(&mut self) -> io::Result<u64> { Result::Ok(self.end - self.begin) }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 impl<'a> WindowedReadStream for OwningWindowedReadStream<'a> {
@@ -146,6 +164,8 @@ impl<'a> Seek for SharedWindowedReadStream<'a> {
 
 impl<'a> ReadStream for SharedWindowedReadStream<'a> {
     fn stable_stream_len(&mut self) -> io::Result<u64> { Result::Ok(self.end - self.begin) }
+
+    fn as_dyn(&mut self) -> &mut dyn ReadStream { self }
 }
 
 impl<'a> WindowedReadStream for SharedWindowedReadStream<'a> {