2 files changed, 36 insertions, 0 deletions
diff --git a/src/fs.rs b/src/fs.rs
index 0aaf2a93d..9191d5373 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -1,6 +1,7 @@
 use std;
 use std::fs::File;
 use std::io::Read;
+use std::io::Write;
 use std::path::Path;
 
 pub fn read_file_sync(path: &Path) -> std::io::Result<Vec<u8>> {
@@ -17,6 +18,11 @@ pub fn read_file_sync_string(path: &Path) -> std::io::Result<String> {
     .map_err(|err| std::io::Error::new(std::io::ErrorKind::InvalidData, err))
 }
 
+pub fn write_file_sync(path: &Path, content: &[u8]) -> std::io::Result<()> {
+  let mut f = File::create(path)?;
+  f.write_all(content)
+}
+
 pub fn mkdir(path: &Path) -> std::io::Result<()> {
   debug!("mkdir -p {}", path.display());
   assert!(path.has_root(), "non-has_root not yet implemented");
diff --git a/src/handlers.rs b/src/handlers.rs
index 853fbbc77..1b8a59173 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -70,6 +70,14 @@ pub extern "C" fn msg_from_js(d: *const DenoC, buf: deno_buf) {
       let filename = msg.filename().unwrap();
       handle_read_file_sync(d, &mut builder, filename)
     }
+    msg::Any::WriteFileSync => {
+      // TODO base.msg_as_WriteFileSync();
+      let msg = msg::WriteFileSync::init_from_table(base.msg().unwrap());
+      let filename = msg.filename().unwrap();
+      let data = msg.data().unwrap();
+      let perm = msg.perm();
+      handle_write_file_sync(d, &mut builder, filename, data, perm)
+    }
     _ => panic!(format!(
       "Unhandled message {}",
       msg::enum_name_any(msg_type)
@@ -413,6 +421,28 @@ fn handle_read_file_sync(
   ))
 }
 
+fn handle_write_file_sync(
+  d: *const DenoC,
+  builder: &mut FlatBufferBuilder,
+  filename: &str,
+  data: &[u8],
+  perm: u32,
+) -> HandlerResult {
+  debug!("handle_write_file_sync {}", filename);
+  let deno = from_c(d);
+  if deno.flags.allow_write {
+    // TODO(ry) Use perm.
+    fs::write_file_sync(Path::new(filename), data)?;
+    Ok(null_buf())
+  } else {
+    let err = std::io::Error::new(
+      std::io::ErrorKind::PermissionDenied,
+      "allow_write is off.",
+    );
+    Err(err.into())
+  }
+}
+
 // TODO(ry) Use Deno instead of DenoC as first arg.
 fn remove_timer(d: *const DenoC, timer_id: u32) {
   let deno = from_c(d);