From 73924f94164c2bccf5097d68d1597abb5621f036 Mon Sep 17 00:00:00 2001
From: Leandro Pereira <leandro@hardinfo.org>
Date: Fri, 1 Oct 2021 20:52:17 -0700
Subject: [PATCH] LibCore: Add File::size()

Returns the size in bytes for a file path given its filename. Useful
when file size is needed without having to open the file to query it
using fstat() or seeking to the end.
---
 Userland/Libraries/LibCore/File.cpp | 8 ++++++++
 Userland/Libraries/LibCore/File.h   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibCore/File.cpp b/Userland/Libraries/LibCore/File.cpp
index 3f97cd1602..f6aac9e676 100644
--- a/Userland/Libraries/LibCore/File.cpp
+++ b/Userland/Libraries/LibCore/File.cpp
@@ -153,6 +153,14 @@ bool File::exists(String const& filename)
     return stat(filename.characters(), &st) == 0;
 }
 
+Result<size_t, OSError> File::size(String const& filename)
+{
+    struct stat st;
+    if (stat(filename.characters(), &st) < 0)
+        return OSError(errno);
+    return st.st_size;
+}
+
 String File::real_path_for(String const& filename)
 {
     if (filename.is_null())
diff --git a/Userland/Libraries/LibCore/File.h b/Userland/Libraries/LibCore/File.h
index 30be3aa333..58989eef74 100644
--- a/Userland/Libraries/LibCore/File.h
+++ b/Userland/Libraries/LibCore/File.h
@@ -34,6 +34,7 @@ public:
     static bool is_link(String const& filename);
 
     static bool exists(String const& filename);
+    static Result<size_t, OSError> size(String const& filename);
     static bool ensure_parent_directories(String const& path);
     static String current_working_directory();
     static String absolute_path(String const& path);