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+## ByteSize
+[![Build Status](https://travis-ci.org/hyunsik/bytesize.svg?branch=master)](https://travis-ci.org/hyunsik/bytesize)
+[![Crates.io Version](https://img.shields.io/crates/v/bytesize.svg)](https://crates.io/crates/bytesize)
+
+
+ByteSize is an utility for human-readable byte count representation.
+
+[API Documentation](https://docs.rs/bytesize/)
+
+## Usage
+
+Add this to your Cargo.toml:
+
+```toml
+[dependencies]
+bytesize = "1.0.0"
+```
+
+and this to your crate root:
+```rust
+extern crate bytesize;
+```
+
+## Example
+### Human readable representations (SI unit and Binary unit)
+```rust
+#[allow(dead_code)]
+fn assert_display(expected: &str, b: ByteSize) {
+  assert_eq!(expected, format!("{}", b));
+}
+
+#[test]
+  fn test_display() {
+    assert_display("215 B", ByteSize(215));
+    assert_display("215 B", ByteSize::b(215));
+    assert_display("1.0 KB", ByteSize::kb(1));
+    assert_display("301.0 KB", ByteSize::kb(301));
+    assert_display("419.0 MB", ByteSize::mb(419));
+    assert_display("518.0 GB", ByteSize::gb(518));
+    assert_display("815.0 TB", ByteSize::tb(815));
+    assert_display("609.0 PB", ByteSize::pb(609));
+  }
+
+  fn assert_to_string(expected: &str, b: ByteSize, si: bool) {
+    assert_eq!(expected.to_string(), b.to_string_as(si));
+  }
+
+  #[test]
+  fn test_to_string() {
+    assert_to_string("215 B", ByteSize(215), true);
+    assert_to_string("215 B", ByteSize(215), false);
+  
+    assert_to_string("215 B", ByteSize::b(215), true);
+    assert_to_string("215 B", ByteSize::b(215), false);
+
+    assert_to_string("1.0 kiB", ByteSize::kib(1), true);
+    assert_to_string("1.0 KB", ByteSize::kib(1), false);
+
+    assert_to_string("293.9 kiB", ByteSize::kb(301), true);
+    assert_to_string("301.0 KB", ByteSize::kb(301), false);
+
+    assert_to_string("1.0 MiB", ByteSize::mib(1), true);
+    assert_to_string("1048.6 KB", ByteSize::mib(1), false);
+
+    assert_to_string("399.6 MiB", ByteSize::mb(419), true);
+    assert_to_string("419.0 MB", ByteSize::mb(419), false);
+
+    assert_to_string("482.4 GiB", ByteSize::gb(518), true);
+    assert_to_string("518.0 GB", ByteSize::gb(518), false);
+
+    assert_to_string("741.2 TiB", ByteSize::tb(815), true);
+    assert_to_string("815.0 TB", ByteSize::tb(815), false);
+
+    assert_to_string("540.9 PiB", ByteSize::pb(609), true);
+    assert_to_string("609.0 PB", ByteSize::pb(609), false);
+}
+```
+
+### Arithmetic operations
+```rust
+extern crate bytesize;
+
+use bytesize::ByteSize;
+
+fn byte_arithmetic_operator() {
+  let x = ByteSize::mb(1);
+  let y = ByteSize::kb(100);
+
+  let plus = x + y;
+  print!("{}", plus);
+
+  let minus = ByteSize::tb(100) + ByteSize::gb(4);
+  print!("{}", minus);
+}
+```