refactor(uri): make ByteStr an implementation detail of uri

src/common/str.rs

@@ -0,0 +1,45 @@
+use std::ops::Deref;
+use std::str;
+
+use bytes::Bytes;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ByteStr(Bytes);
+
+impl ByteStr {
+    pub unsafe fn from_utf8_unchecked(slice: Bytes) -> ByteStr {
+        ByteStr(slice)
+    }
+
+    pub fn from_static(s: &'static str) -> ByteStr {
+        ByteStr(Bytes::from_static(s.as_bytes()))
+    }
+
+    pub fn slice(&self, from: usize, to: usize) -> ByteStr {
+        assert!(self.as_str().is_char_boundary(from));
+        assert!(self.as_str().is_char_boundary(to));
+        ByteStr(self.0.slice(from, to))
+    }
+
+    pub fn slice_to(&self, idx: usize) -> ByteStr {
+        assert!(self.as_str().is_char_boundary(idx));
+        ByteStr(self.0.slice_to(idx))
+    }
+
+    pub fn as_str(&self) -> &str {
+        unsafe { str::from_utf8_unchecked(self.0.as_ref()) }
+    }
+}
+
+impl Deref for ByteStr {
+    type Target = str;
+    fn deref(&self) -> &str {
+        self.as_str()
+    }
+}
+
+impl<'a> From<&'a str> for ByteStr {
+    fn from(s: &'a str) -> ByteStr {
+        ByteStr(Bytes::from(s))
+    }
+}