Revert "remove now-dead code"

This reverts commit fd11f28.

src/aes.rs

@@ -216,6 +216,13 @@ impl<R: Read> Read for AesReaderValid<R> {
     }
 }
 
+impl<R> AesReaderValid<R> {
+    /// Consumes this decoder, returning the underlying reader.
+    pub fn into_inner(self) -> R {
+        self.reader
+    }
+}
+
 pub struct AesWriter<W> {
     writer: W,
     cipher: Cipher,

src/crc32.rs

@@ -31,6 +31,11 @@ impl<R> Crc32Reader<R> {
             Err("Invalid checksum")
         }
     }
+
+    #[allow(dead_code)]
+    pub fn into_inner(self) -> R {
+        self.inner
+    }
 }
 
 impl<R: Read> Read for Crc32Reader<R> {

src/read/lzma.rs

@@ -1,6 +1,6 @@
 use lzma_rs::decompress::{Options, Stream, UnpackedSize};
 use std::collections::VecDeque;
-use std::io::{Read, Result, Write};
+use std::io::{copy, Error, Read, Result, Write};
 
 const COMPRESSED_BYTES_TO_BUFFER: usize = 4096;
 
@@ -23,6 +23,11 @@ impl<R: Read> LzmaDecoder<R> {
             stream: Stream::new_with_options(&OPTIONS, VecDeque::new()),
         }
     }
+
+    pub fn finish(mut self) -> Result<VecDeque<u8>> {
+        copy(&mut self.compressed_reader, &mut self.stream)?;
+        self.stream.finish().map_err(Error::from)
+    }
 }
 
 impl<R: Read> Read for LzmaDecoder<R> {

src/read/xz.rs

@@ -262,3 +262,9 @@ impl<R: Read> Read for XzDecoder<R> {
         Ok(written)
     }
 }
+
+impl<R: Read> XzDecoder<R> {
+    pub fn into_inner(self) -> R {
+        self.compressed_reader.into_inner()
+    }
+}

src/zipcrypto.rs

@@ -202,6 +202,14 @@ impl<R: std::io::Read> std::io::Read for ZipCryptoReaderValid<R> {
     }
 }
 
+impl<R> ZipCryptoReaderValid<R> {
+    /// Consumes this decoder, returning the underlying reader.
+    #[allow(dead_code)]
+    pub fn into_inner(self) -> R {
+        self.reader.file
+    }
+}
+
 static CRCTABLE: [u32; 256] = [
     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
     0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,