From 21c1e132b7de05360abbac48347470a2067854ff Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@sequoia-pgp.org>
Date: Fri, 7 Sep 2018 19:07:47 +0200
Subject: buffered-reader: Add a new buffered reader for files.

---
 buffered-reader/src/file_generic.rs | 94 +++++++++++++++++++++++++++++++++++++
 buffered-reader/src/lib.rs          |  3 ++
 2 files changed, 97 insertions(+)
 create mode 100644 buffered-reader/src/file_generic.rs

(limited to 'buffered-reader')

diff --git a/buffered-reader/src/file_generic.rs b/buffered-reader/src/file_generic.rs
new file mode 100644
index 00000000..deb8da95
--- /dev/null
+++ b/buffered-reader/src/file_generic.rs
@@ -0,0 +1,94 @@
+use std::fmt;
+use std::fs::File;
+use std::io;
+use std::path::Path;
+
+use super::*;
+
+/// A `BufferedReader` implementation for files.
+///
+/// This is a generic implementation that may be replaced by
+/// platform-specific versions.
+pub struct BufferedReaderFile<C>(BufferedReaderGeneric<File, C>);
+
+impl<C> fmt::Debug for BufferedReaderFile<C> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("BufferedReaderFile")
+            .field(&self.0)
+            .finish()
+    }
+}
+
+impl BufferedReaderFile<()> {
+    /// Opens the given file.
+    pub fn open<P: AsRef<Path>>(path: P) -> io::Result<Self> {
+        Self::with_cookie(path, ())
+    }
+}
+
+impl<C> BufferedReaderFile<C> {
+    /// Like `open()`, but sets a cookie.
+    pub fn with_cookie<P: AsRef<Path>>(path: P, cookie: C) -> io::Result<Self> {
+        Ok(BufferedReaderFile(
+            BufferedReaderGeneric::with_cookie(File::open(path)?,
+                                               None,
+                                               cookie)))
+    }
+}
+
+impl<C> io::Read for BufferedReaderFile<C> {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+}
+
+impl<C> BufferedReader<C> for BufferedReaderFile<C> {
+    fn buffer(&self) -> &[u8] {
+        self.0.buffer()
+    }
+
+    fn data(&mut self, amount: usize) -> io::Result<&[u8]> {
+        self.0.data(amount)
+    }
+
+    fn data_hard(&mut self, amount: usize) -> io::Result<&[u8]> {
+        self.0.data_hard(amount)
+    }
+
+    fn consume(&mut self, amount: usize) -> &[u8] {
+        self.0.consume(amount)
+    }
+
+    fn data_consume(&mut self, amount: usize) -> io::Result<&[u8]> {
+        self.0.data_consume(amount)
+    }
+
+    fn data_consume_hard(&mut self, amount: usize) -> io::Result<&[u8]> {
+        self.0.data_consume_hard(amount)
+    }
+
+    fn get_mut(&mut self) -> Option<&mut BufferedReader<C>> {
+        None
+    }
+
+    fn get_ref(&self) -> Option<&BufferedReader<C>> {
+        None
+    }
+
+    fn into_inner<'b>(self: Box<Self>) -> Option<Box<BufferedReader<C> + 'b>>
+        where Self: 'b {
+        None
+    }
+
+    fn cookie_set(&mut self, cookie: C) -> C {
+        self.0.cookie_set(cookie)
+    }
+
+    fn cookie_ref(&self) -> &C {
+        self.0.cookie_ref()
+    }
+
+    fn cookie_mut(&mut self) -> &mut C {
+        self.0.cookie_mut()
+    }
+}
diff --git a/buffered-reader/src/lib.rs b/buffered-reader/src/lib.rs
index 11b93ce0..8008ff23 100644
--- a/buffered-reader/src/lib.rs
+++ b/buffered-reader/src/lib.rs
@@ -32,6 +32,9 @@ pub use self::decompress_deflate::BufferedReaderZlib;
 #[cfg(feature = "compression-bzip2")]
 pub use self::decompress_bzip2::BufferedReaderBzip;
 
+mod file_generic;
+pub use self::file_generic::BufferedReaderFile;
+
 // The default buffer size.
 const DEFAULT_BUF_SIZE: usize = 8 * 1024;
 
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