X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=fuzz%2Ffuzz_targets%2Fmsg_targets%2Futils.rs;h=a5257ba0f80c1fea24f399018103da37f572c763;hb=19b92448c579982fcfcd52e28448323576472883;hp=52ea530cf9fed976438e30f5ad1beff30ac94af7;hpb=712051a9fca1b9b2946e9af395036b904b255d32;p=rust-lightning

diff --git a/fuzz/fuzz_targets/msg_targets/utils.rs b/fuzz/fuzz_targets/msg_targets/utils.rs
index 52ea530c..a5257ba0 100644
--- a/fuzz/fuzz_targets/msg_targets/utils.rs
+++ b/fuzz/fuzz_targets/msg_targets/utils.rs
@@ -1,5 +1,18 @@
 #![macro_use]
 
+use lightning::util::ser::Writer;
+pub struct VecWriter(pub Vec<u8>);
+impl Writer for VecWriter {
+	fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
+		assert!(self.0.capacity() >= self.0.len() + buf.len());
+		self.0.extend_from_slice(buf);
+		Ok(())
+	}
+	fn size_hint(&mut self, size: usize) {
+		self.0.reserve_exact(size);
+	}
+}
+
 #[macro_export]
 macro_rules! test_msg {
 	($MsgType: path, $data: ident) => {
@@ -8,12 +21,11 @@ macro_rules! test_msg {
 			let mut r = ::std::io::Cursor::new($data);
 			if let Ok(msg) = <$MsgType as Readable<::std::io::Cursor<&[u8]>>>::read(&mut r) {
 				let p = r.position() as usize;
-				let mut w = ::std::io::Cursor::new(vec![]);
+				let mut w = VecWriter(Vec::new());
 				msg.write(&mut w).unwrap();
 
-				let buf = w.into_inner();
-				assert_eq!(buf.len(), p);
-				assert_eq!(&r.into_inner()[..p], &buf[..p]);
+				assert_eq!(w.0.len(), p);
+				assert_eq!(&r.into_inner()[..p], &w.0[..p]);
 			}
 		}
 	}
@@ -26,7 +38,8 @@ macro_rules! test_msg_simple {
 			use lightning::util::ser::{Writeable, Readable};
 			let mut r = ::std::io::Cursor::new($data);
 			if let Ok(msg) = <$MsgType as Readable<::std::io::Cursor<&[u8]>>>::read(&mut r) {
-				msg.write(&mut ::std::io::Cursor::new(vec![])).unwrap();
+				let mut w = VecWriter(Vec::new());
+				msg.write(&mut w).unwrap();
 			}
 		}
 	}
@@ -39,11 +52,10 @@ macro_rules! test_msg_exact {
 			use lightning::util::ser::{Writeable, Readable};
 			let mut r = ::std::io::Cursor::new($data);
 			if let Ok(msg) = <$MsgType as Readable<::std::io::Cursor<&[u8]>>>::read(&mut r) {
-				let mut w = ::std::io::Cursor::new(vec![]);
+				let mut w = VecWriter(Vec::new());
 				msg.write(&mut w).unwrap();
 
-				let buf = w.into_inner();
-				assert_eq!(&r.into_inner()[..], &buf[..]);
+				assert_eq!(&r.into_inner()[..], &w.0[..]);
 			}
 		}
 	}
@@ -56,14 +68,13 @@ macro_rules! test_msg_hole {
 			use lightning::util::ser::{Writeable, Readable};
 			let mut r = ::std::io::Cursor::new($data);
 			if let Ok(msg) = <$MsgType as Readable<::std::io::Cursor<&[u8]>>>::read(&mut r) {
-				let mut w = ::std::io::Cursor::new(vec![]);
+				let mut w = VecWriter(Vec::new());
 				msg.write(&mut w).unwrap();
-				let p = w.position() as usize;
+				let p = w.0.len() as usize;
 
-				let buf = w.into_inner();
-				assert_eq!(buf.len(),p);
-				assert_eq!(&r.get_ref()[..$hole], &buf[..$hole]);
-				assert_eq!(&r.get_ref()[$hole+$hole_len..p], &buf[$hole+$hole_len..]);
+				assert_eq!(w.0.len(), p);
+				assert_eq!(&r.get_ref()[..$hole], &w.0[..$hole]);
+				assert_eq!(&r.get_ref()[$hole+$hole_len..p], &w.0[$hole+$hole_len..]);
 			}
 		}
 	}