From b42d94c33baacf9ac90299497459ca8a6b4ac204 Mon Sep 17 00:00:00 2001
From: Carl Lerche <me@carllerche.com>
Date: Fri, 14 Oct 2016 20:42:32 -0700
Subject: [PATCH] Add BoundBuf
---
src/imp/buf/bound.rs | 55 ++++++++++++++++++++++++++++++++++++++++++++
src/imp/buf/mod.rs | 1 +
2 files changed, 56 insertions(+)
create mode 100644 src/imp/buf/bound.rs
diff --git a/src/imp/buf/bound.rs b/src/imp/buf/bound.rs
new file mode 100644
index 0000000..66cc2ca
--- /dev/null
+++ b/src/imp/buf/bound.rs
@@ -0,0 +1,55 @@
+use {Buf, IntoBuf};
+use std::mem;
+
+/// Takes a `T` that can be iterated as a buffer and provides buffer with a
+/// 'static lifetime
+pub struct BoundBuf<T>
+ where T: 'static,
+ &'static T: IntoBuf
+{
+ data: T, // This should never be mutated
+ buf: <&'static T as IntoBuf>::Buf, // This buf should never leak out
+}
+
+impl<T> BoundBuf<T>
+ where &'static T: IntoBuf,
+{
+ /// Creates a new `BoundBuf` wrapping the provided data
+ pub fn new(data: T) -> BoundBuf<T> {
+ let buf = unsafe {
+ let r: &'static T = mem::transmute(&data);
+ r.into_buf()
+ };
+
+ BoundBuf {
+ data: data,
+ buf: buf,
+ }
+ }
+
+ /// Consumes this BoundBuf, returning the underlying value.
+ pub fn into_inner(self) -> T {
+ self.data
+ }
+
+ /// Gets a reference to the underlying value
+ pub fn get_ref(&self) -> &T {
+ &self.data
+ }
+}
+
+impl<T> Buf for BoundBuf<T>
+ where &'static T: IntoBuf
+{
+ fn remaining(&self) -> usize {
+ self.buf.remaining()
+ }
+
+ fn bytes(&self) -> &[u8] {
+ self.buf.bytes()
+ }
+
+ fn advance(&mut self, cnt: usize) {
+ self.buf.advance(cnt)
+ }
+}
diff --git a/src/imp/buf/mod.rs b/src/imp/buf/mod.rs
index 118cc47..44c20f0 100644
--- a/src/imp/buf/mod.rs
+++ b/src/imp/buf/mod.rs
@@ -1,5 +1,6 @@
pub mod append;
pub mod block;
+pub mod bound;
pub mod slice;
pub mod ring;
pub mod take;
--
GitLab