Generalize disk file creation logic

virtweb_backend/src/utils/file_size_utils.rs

@@ -0,0 +1,28 @@
+#[derive(
+    serde::Serialize, serde::Deserialize, Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord,
+)]
+pub struct FileSize(usize);
+
+impl FileSize {
+    pub const fn from_bytes(size: usize) -> Self {
+        Self(size)
+    }
+
+    pub const fn from_mb(mb: usize) -> Self {
+        Self(mb * 1000 * 1000)
+    }
+
+    pub const fn from_gb(gb: usize) -> Self {
+        Self(gb * 1000 * 1000 * 1000)
+    }
+
+    /// Get file size as bytes
+    pub fn as_bytes(&self) -> usize {
+        self.0
+    }
+
+    /// Get file size as megabytes
+    pub fn as_mb(&self) -> usize {
+        self.0 / (1000 * 1000)
+    }
+}