add Bytes::trimdown() method

ntex-bytes/CHANGELOG.md

@@ -1,5 +1,9 @@
 # 0.1.0 (2021-07-xx)
 
+* Add `Bytes::trimdown()` method
+
+* Remove unused code
+
 * Project fork
 
 # 0.4.12 (March 6, 2019)

ntex-bytes/README.md

@@ -5,7 +5,7 @@ A utility library for working with bytes. This is fork of bytes crate (https://g
 [![Crates.io][crates-badge]][crates-url]
 [![Build Status][azure-badge]][azure-url]
 
-[crates-badge]: https://img.shields.io/crates/v/bytes.svg
+[crates-badge]: https://img.shields.io/crates/v/ntex-bytes.svg
 [crates-url]: https://crates.io/crates/ntex-bytes
 
 [Documentation](https://docs.rs/ntex-bytes)

ntex-bytes/src/bytes.rs

@@ -706,6 +706,33 @@ impl Bytes {
         self.inner.truncate(len);
     }
 
+    /// Shortens the buffer to `len` bytes and dropping the rest.
+    ///
+    /// This is useful if underlying buffer is larger than cuurrent bytes object.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use ntex_bytes::Bytes;
+    ///
+    /// let mut buf = Bytes::from(&b"hello world"[..]);
+    /// buf.trimdown();
+    /// assert_eq!(buf, b"hello world"[..]);
+    /// ```
+    #[inline]
+    pub fn trimdown(&mut self) {
+        let kind = self.inner.kind();
+
+        // trim down only if buffer is not inline or static and
+        // buffer cap is greater than 64 bytes
+        if !(kind == KIND_INLINE || kind == KIND_STATIC)
+            && (self.inner.capacity() - self.inner.len() >= 64)
+        {
+            let bytes = Bytes::copy_from_slice(self);
+            let _ = mem::replace(self, bytes);
+        }
+    }
+
     /// Clears the buffer, removing all data.
     ///
     /// # Examples

ntex-bytes/src/string.rs

@@ -32,6 +32,12 @@ impl ByteString {
         Self(Bytes::from_static(src.as_bytes()))
     }
 
+    /// Shortens the buffer to `len` bytes and dropping the rest.
+    #[inline]
+    pub fn trimdown(&mut self) {
+        self.0.trimdown()
+    }
+
     /// Creates a new `ByteString` from a Bytes.
     ///
     /// # Safety