diff --git a/src/core/File.cc b/src/core/File.cc
index 3d5097c..3b391cb 100644
--- a/src/core/File.cc
+++ b/src/core/File.cc
@@ -89,3 +89,27 @@ bool File::read(uint8_t * buf, size_t size)
 
     return true;
 }
+
+bool File::write(const uint8_t * buf, size_t size)
+{
+    if (size <= 0)
+        return true;
+
+    size_t n_bytes_written = 0u;
+    for (;;)
+    {
+        off_t write_size = ::write(m_fd, &buf[n_bytes_written], size - n_bytes_written);
+        if (write_size <= 0)
+            break;
+        n_bytes_written += (size_t)write_size;
+        if (n_bytes_written >= size)
+            break;
+    }
+
+    if (n_bytes_written != size)
+    {
+        return false;
+    }
+
+    return true;
+}
diff --git a/src/core/File.h b/src/core/File.h
index fccffc0..e94291b 100644
--- a/src/core/File.h
+++ b/src/core/File.h
@@ -13,6 +13,7 @@ public:
     void close();
     size_t get_size();
     bool read(uint8_t * buf, size_t size);
+    bool write(const uint8_t * buf, size_t size);
 
 protected:
     int m_fd;