diff --git a/src/cmd_decrypt.rs b/src/cmd_decrypt.rs
index 6b356b6..a518b83 100644
--- a/src/cmd_decrypt.rs
+++ b/src/cmd_decrypt.rs
@@ -210,7 +210,7 @@ pub fn decrypt_single(config: &Option<TinyEncryptConfig>,
     Ok(meta.file_length)
 }
 
-fn decrypt_file(file_in: &mut File, file_len: u64, file_out: &mut impl Write,
+fn decrypt_file(file_in: &mut impl Read, file_len: u64, file_out: &mut impl Write,
                 cryptor: Cryptor, key_nonce: &KeyNonce, compress: bool) -> XResult<u64> {
     let mut total_len = 0_u64;
     let mut buffer = [0u8; 1024 * 8];
diff --git a/src/cmd_directdecrypt.rs b/src/cmd_directdecrypt.rs
index c7ced37..51d5c34 100644
--- a/src/cmd_directdecrypt.rs
+++ b/src/cmd_directdecrypt.rs
@@ -96,8 +96,7 @@ pub fn direct_decrypt(cmd_direct_decrypt: CmdDirectDecrypt) -> XResult<()> {
     Ok(())
 }
 
-
-fn decrypt_file(file_in: &mut File, file_len: u64, file_out: &mut impl Write,
+fn decrypt_file(file_in: &mut impl Read, file_len: u64, file_out: &mut impl Write,
                 cryptor: Cryptor, key_nonce: &KeyNonce) -> XResult<u64> {
     let mut total_len = 0_u64;
     let mut buffer = [0u8; 1024 * 8];
diff --git a/src/cmd_encrypt.rs b/src/cmd_encrypt.rs
index ce33976..075c00a 100644
--- a/src/cmd_encrypt.rs
+++ b/src/cmd_encrypt.rs
@@ -184,7 +184,7 @@ pub fn encrypt_single_file_out(path: &PathBuf, path_out: &str, envelops: &[&Tiny
     Ok(file_metadata.len())
 }
 
-fn encrypt_file(file_in: &mut File, file_len: u64, file_out: &mut impl Write, cryptor: Cryptor,
+fn encrypt_file(file_in: &mut impl Read, file_len: u64, file_out: &mut impl Write, cryptor: Cryptor,
                 key_nonce: &KeyNonce, compress_level: &Option<u32>) -> XResult<u64> {
     let compress = compress_level.is_some();
     let mut total_len = 0_u64;
diff --git a/src/spec.rs b/src/spec.rs
index 9b111e4..4be367a 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -1,6 +1,5 @@
 use std::fs::Metadata;
 
-use flate2::Compression;
 use rust_util::{opt_result, util_time, XResult};
 use rust_util::util_time::get_millis;
 use serde::{Deserialize, Serialize};