Hoist common features to BinarySource

implementations/rust/oo/src/packed/reader.rs

@@ -1,5 +1,5 @@
 use crate::{ValueClass, AtomClass, Atom};
-use crate::error::{self, ExpectedKind, io_eof};
+use crate::error::{self, ExpectedKind};
 
 use num_bigint::BigInt;
 use num_traits::cast::{FromPrimitive, ToPrimitive};
@@ -78,18 +78,6 @@ impl<'de, 'src, S: BinarySource<'de>> PackedReader<'de, 'src, S> {
         PackedReader { source, phantom: PhantomData }
     }
 
-    #[inline(always)]
-    fn peek_noeof(&mut self) -> io::Result<u8> {
-        self.peek()?.ok_or_else(io_eof)
-    }
-
-    #[inline(always)]
-    fn read(&mut self) -> io::Result<u8> {
-        let v = self.peek_noeof()?;
-        self.skip()?;
-        Ok(v)
-    }
-
     #[inline(always)]
     fn varint(&mut self) -> io::Result<u64> {
         let mut shift = 0;

implementations/rust/oo/src/source.rs

@@ -17,6 +17,18 @@ pub trait BinarySource<'de>: Sized {
 
     //---------------------------------------------------------------------------
 
+    #[inline(always)]
+    fn peek_noeof(&mut self) -> io::Result<u8> {
+        self.peek()?.ok_or_else(io_eof)
+    }
+
+    #[inline(always)]
+    fn read(&mut self) -> io::Result<u8> {
+        let v = self.peek_noeof()?;
+        self.skip()?;
+        Ok(v)
+    }
+
     fn syntax_error(&mut self, message: &str) -> io::Error {
         io::Error::new(io::ErrorKind::InvalidData, SyntaxError {
             position: match self.input_position() {

implementations/rust/oo/src/text/reader.rs

@@ -67,17 +67,16 @@ impl<'de, 'src, S: BinarySource<'de>> TextReader<'de, 'src, S>
 
     #[inline(always)]
     fn peek_noeof(&mut self) -> io::Result<u8> {
-        self.source.peek()?.ok_or_else(io_eof)
+        self.source.peek_noeof()
     }
 
     fn skip(&mut self) -> io::Result<()> {
         self.source.skip()
     }
 
+    #[inline(always)]
     fn next_byte(&mut self) -> io::Result<u8> {
-        let b = self.peek_noeof()?;
-        self.source.skip()?;
-        Ok(b)
+        self.source.read()
     }
 
     fn skip_whitespace(&mut self) {