diff --git a/Cargo.lock b/Cargo.lock
index 69b19ce..2c11a70 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -149,7 +149,7 @@ dependencies = [
  "indicatif 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libsm 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "rust_util 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rust_util 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -446,7 +446,7 @@ dependencies = [
 
 [[package]]
 name = "rust_util"
-version = "0.1.0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -626,7 +626,7 @@ dependencies = [
 "checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
 "checksum rust-argon2 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4ca4eaef519b494d1f2848fc602d18816fed808a981aedf4f1f00ceb7c9d32cf"
 "checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
-"checksum rust_util 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5dc9b9d45cf4e9a8a28c1c622f0a2bba9af88b85ec04c494d80605a717c1c022"
+"checksum rust_util 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd9973675144c03fdf6f9a559ea5c254b0008e90a8992b1f317f728edd3512bc"
 "checksum rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "661641ea2aa15845cddeb97dad000d22070bb5c1fb456b96c1cba883ec691e92"
diff --git a/Cargo.toml b/Cargo.toml
index f9d22ce..92bbec1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,6 @@ libsm = "0.3.0"
 rust-crypto = "0.2.36"
 hex = "0.4.0"
 indicatif = "0.13.0"
-rust_util = "0.1.0"
+rust_util = "0.2.2"
 
 
diff --git a/src/main.rs b/src/main.rs
index 9c14990..0b103a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,10 @@
 mod opt;
 
 use rust_util::{
+    iff,
     XResult,
     new_box_ioerror,
-    util_msg::{
-        print_message,
-        MessageType,
-    },
+    util_msg::{ print_message, MessageType, },
 };
 use std::{
     fs::File,
@@ -20,14 +18,7 @@ use crypto::{
     blake2b::Blake2b,
     md5::Md5,
     sha1::Sha1,
-    sha2::{
-        Sha224,
-        Sha256,
-        Sha384,
-        Sha512,
-        Sha512Trunc224,
-        Sha512Trunc256,
-    },
+    sha2::{ Sha224, Sha256, Sha384, Sha512, Sha512Trunc224, Sha512Trunc256, },
     sha3::Sha3,
 };
 use indicatif::{
@@ -115,8 +106,8 @@ fn get_digest_by_algorithm(algo: &str, options: &Options) -> Option<Box<dyn Dige
     match algo {
         "RIPEMD160" => Some(Box::new(Ripemd160::new())),
         "WHIRLPOOL" => Some(Box::new(Whirlpool::new())),
-        "BLAKE2S" => Some(Box::new(Blake2s::new(if options.blake_len == 0_usize { 32 } else { options.blake_len }))),
-        "BLAKE2B" => Some(Box::new(Blake2b::new(if options.blake_len == 0_usize { 64 } else { options.blake_len }))),
+        "BLAKE2S" => Some(Box::new(Blake2s::new(iff!(options.blake_len == 0_usize, 32, options.blake_len)))),
+        "BLAKE2B" => Some(Box::new(Blake2b::new(iff!(options.blake_len == 0_usize, 64, options.blake_len)))),
         "MD5" => Some(Box::new(Md5::new())),
         "SHA1" | "SHA-1" => Some(Box::new(Sha1::new())),
         "SHA224" | "SHA-224" => Some(Box::new(Sha224::new())),
@@ -143,16 +134,17 @@ fn read_file_full(file_name: &str) -> XResult<Vec<u8>> {
     let mut buf: [u8; BUFF_SIZE] = [0u8; BUFF_SIZE];
     let mut f = File::open(file_name)?;
     let file_len = f.metadata()?.len();
-    let mut ret: Vec<u8> = Vec::new();
-    let mut read = 0_u64;
 
     if file_len > FILE_SIZE_1GB {
-        return Err(new_box_ioerror("File too large!"));
+        return Err(new_box_ioerror(&format!("File too large!, file size: {}bytes", file_len)));
     }
 
+    let mut ret: Vec<u8> = Vec::with_capacity(file_len as usize);
+
     let pb = ProgressBar::new(file_len);
     pb.set_style(ProgressStyle::default_bar().template(PB_TEMPLATE).progress_chars(PB_PROGRESS));
 
+    let mut read = 0_u64;
     loop {
         let len = match f.read(&mut buf) {
             Ok(0) => { pb.finish_and_clear(); return Ok(ret); },
@@ -195,7 +187,7 @@ fn read_full_stdin() -> XResult<Vec<u8>> {
     let mut handle = stdin.lock();
     loop {
         let len = match handle.read(&mut buf) {
-            Ok(0) => { return Ok(ret); },
+            Ok(0) => return Ok(ret),
             Ok(len) => len,
             Err(ref e) if e.kind() == ErrorKind::Interrupted => continue,
             Err(e) => return Err(Box::new(e)),
@@ -210,7 +202,7 @@ fn calc_digest_stdin(digest: &mut dyn Digest) -> XResult<String> {
     let mut handle = stdin.lock();
     loop {
         let len = match handle.read(&mut buf) {
-            Ok(0) => { return Ok(digest.result_str()); },
+            Ok(0) => return Ok(digest.result_str()),
             Ok(len) => len,
             Err(ref e) if e.kind() == ErrorKind::Interrupted => continue,
             Err(e) => return Err(Box::new(e)),