feat: add bytes

bytes/Cargo.lock

@@ -0,0 +1,21 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "bytes"
+version = "0.1.0"
+dependencies = [
+ "bytes 0.5.6",
+ "hex",
+]
+
+[[package]]
+name = "bytes"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
+
+[[package]]
+name = "hex"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"

bytes/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "bytes"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bytes = "0.5.6"
+hex = "0.4.2"

bytes/src/main.rs

@@ -0,0 +1,24 @@
+use bytes::{Bytes, BytesMut, Buf, BufMut};
+
+fn main() {
+    println!("Run #test_bytes()");
+    test_bytes();
+    println!("Run #test_bytes_mut()");
+    test_bytes_mut();
+}
+
+fn test_bytes() {
+    let mut buf = Bytes::from(&b"1122334455"[..]);
+    let v1 = buf.get_u16();
+    let v2 = buf.get_u16();
+    println!("v1: {}, v2: {}", v1, v2);
+}
+
+fn test_bytes_mut() {
+    let mut buf = BytesMut::with_capacity(2);
+    println!("[{}], len: {}", hex::encode(buf.bytes()), buf.len());
+    buf.put_u64(112233445566778899);
+    println!("[{}], len: {}", hex::encode(buf.bytes()), buf.len());
+    buf.put_u16(1);
+    println!("[{}], len: {}", hex::encode(buf.bytes()), buf.len());
+}