diff --git a/libarchive/src/write/file.rs b/libarchive/src/write/file.rs
index 2bdbd62..08f2b45 100644
--- a/libarchive/src/write/file.rs
+++ b/libarchive/src/write/file.rs
@@ -31,11 +31,7 @@ impl FileWriter {
         }
     }
 
-    pub fn append_path<P: AsRef<Path>>(
-        &mut self,
-        entry: &mut WriteEntry,
-        path: P,
-    ) -> crate::Result<()> {
+    pub fn append_data<R: Read>(&mut self, entry: &mut WriteEntry, r: &mut R) -> crate::Result<()> {
         unsafe {
             match ffi::archive_write_header(self.handle_mut(), entry.entry_mut()) {
                 ffi::ARCHIVE_OK => (),
@@ -43,11 +39,10 @@ impl FileWriter {
             }
         }
 
-        let mut f = fs::File::open(path)?;
         let mut buf = [0; 8192];
 
         loop {
-            match f.read(&mut buf) {
+            match r.read(&mut buf) {
                 Ok(0) => return Ok(()),
                 Ok(written) => unsafe {
                     match ffi::archive_write_data(
@@ -68,6 +63,15 @@ impl FileWriter {
         }
     }
 
+    pub fn append_path<P: AsRef<Path>>(
+        &mut self,
+        entry: &mut WriteEntry,
+        path: P,
+    ) -> crate::Result<()> {
+        let mut f = fs::File::open(path)?;
+        self.append_data(entry, &mut f)
+    }
+
     pub fn close(&mut self) -> crate::Result<()> {
         unsafe {
             match ffi::archive_write_close(self.handle_mut()) {