Support/FileSystem: Add file_size implementation.

llvm-svn: 120867

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/lib/Support/Windows/PathV2.inc b/llvm/lib/Support/Windows/PathV2.inc
index e7aa93b6e4e..dd7fefafc69 100644
--- a/llvm/lib/Support/Windows/PathV2.inc
+++ b/llvm/lib/Support/Windows/PathV2.inc
@@ -406,6 +406,27 @@ error_code equivalent(const Twine &A, const Twine &B, bool &result) {
   return make_error_code(errc::success);
 }
 
+error_code file_size(const Twine &path, uint64_t &result) {
+  SmallString<128> path_storage;
+  SmallVector<wchar_t, 128> path_utf16;
+
+  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
+                                  path_utf16))
+    return ec;
+
+  WIN32_FILE_ATTRIBUTE_DATA FileData;
+  if (!::GetFileAttributesExW(path_utf16.begin(),
+                              ::GetFileExInfoStandard,
+                              &FileData))
+    return make_error_code(windows_error(::GetLastError()));
+
+  result =
+    (uint64_t(FileData.nFileSizeHigh) << (sizeof(FileData.nFileSizeLow) * 8))
+    + FileData.nFileSizeLow;
+
+  return make_error_code(errc::success);
+}
+
 error_code unique_file(const Twine &model, int &result_fd,
                              SmallVectorImpl<char> &result_path) {
   // Use result_path as temp storage.