From 94a0819fe3a0d679c3042a77bfe6a2afc505daea Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:11:28 +0200
Subject: Adding upstream version 1.66.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/memmap2/src/windows.rs | 43 +++++++++----------------------------------
 1 file changed, 9 insertions(+), 34 deletions(-)

(limited to 'vendor/memmap2/src/windows.rs')

diff --git a/vendor/memmap2/src/windows.rs b/vendor/memmap2/src/windows.rs
index b3b8c620a..d580995e6 100644
--- a/vendor/memmap2/src/windows.rs
+++ b/vendor/memmap2/src/windows.rs
@@ -1,8 +1,10 @@
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
 
+use std::fs::File;
+use std::mem::ManuallyDrop;
 use std::os::raw::c_void;
-use std::os::windows::io::RawHandle;
+use std::os::windows::io::{FromRawHandle, RawHandle};
 use std::{io, mem, ptr};
 
 type BOOL = i32;
@@ -82,22 +84,6 @@ pub struct FILETIME {
     pub dwHighDateTime: DWORD,
 }
 
-#[repr(C)]
-struct BY_HANDLE_FILE_INFORMATION {
-    dwFileAttributes: DWORD,
-    ftCreationTime: FILETIME,
-    ftLastAccessTime: FILETIME,
-    ftLastWriteTime: FILETIME,
-    dwVolumeSerialNumber: DWORD,
-    nFileSizeHigh: DWORD,
-    nFileSizeLow: DWORD,
-    nNumberOfLinks: DWORD,
-    nFileIndexHigh: DWORD,
-    nFileIndexLow: DWORD,
-}
-
-type LPBY_HANDLE_FILE_INFORMATION = *mut BY_HANDLE_FILE_INFORMATION;
-
 extern "system" {
     fn GetCurrentProcess() -> HANDLE;
 
@@ -124,11 +110,6 @@ extern "system" {
 
     fn FlushFileBuffers(hFile: HANDLE) -> BOOL;
 
-    fn GetFileInformationByHandle(
-        hFile: HANDLE,
-        lpFileInformation: LPBY_HANDLE_FILE_INFORMATION,
-    ) -> BOOL;
-
     fn FlushViewOfFile(lpBaseAddress: LPCVOID, dwNumberOfBytesToFlush: SIZE_T) -> BOOL;
 
     fn UnmapViewOfFile(lpBaseAddress: LPCVOID) -> BOOL;
@@ -526,16 +507,10 @@ fn allocation_granularity() -> usize {
 }
 
 pub fn file_len(handle: RawHandle) -> io::Result<u64> {
-    let info = unsafe {
-        let mut info = mem::MaybeUninit::<BY_HANDLE_FILE_INFORMATION>::uninit();
-
-        let ok = GetFileInformationByHandle(handle, info.as_mut_ptr());
-        if ok == 0 {
-            return Err(io::Error::last_os_error());
-        }
-
-        info.assume_init()
-    };
-
-    Ok((info.nFileSizeHigh as u64) << 32 | info.nFileSizeLow as u64)
+    // SAFETY: We must not close the passed-in fd by dropping the File we create,
+    // we ensure this by immediately wrapping it in a ManuallyDrop.
+    unsafe {
+        let file = ManuallyDrop::new(File::from_raw_handle(handle));
+        Ok(file.metadata()?.len())
+    }
 }
-- 
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