initial commit

1 files changed, 51 insertions, 0 deletions

diff --git a/src/utils/file.cpp b/src/utils/file.cpp
new file mode 100644
index 0000000..4150685
--- /dev/null
+++ b/src/utils/file.cpp
@@ -0,0 +1,51 @@
+// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "PDB repository" project.
+// For details, see https://github.com/egor-tensin/pdb-repo.
+// Distributed under the MIT License.
+
+#include "pdb/all.hpp"
+
+#include <safeint.h>
+
+#include <Windows.h>
+
+#include <cstddef>
+
+#include <stdexcept>
+#include <string>
+
+namespace pdb
+{
+    namespace file
+    {
+        std::size_t get_size(const std::string& path)
+        {
+            const Handle handle{CreateFileA(
+                path.c_str(),
+                FILE_READ_ATTRIBUTES,
+                FILE_SHARE_READ,
+                NULL,
+                OPEN_EXISTING,
+                FILE_ATTRIBUTE_NORMAL,
+                NULL)};
+
+            if (handle.get() == INVALID_HANDLE_VALUE)
+                throw error::windows(GetLastError());
+
+            LARGE_INTEGER size;
+
+            if (!GetFileSizeEx(handle.get(), &size))
+                throw error::windows(GetLastError());
+
+            try
+            {
+                const msl::utilities::SafeInt<decltype(size.QuadPart)> safe_size{size.QuadPart};
+                return static_cast<std::size_t>(safe_size);
+            }
+            catch (const msl::utilities::SafeIntException&)
+            {
+                throw std::range_error{"invalid file size"};
+            }
+        }
+    }
+}