New upstream version 1.52.1+dfsg1

[rustc.git] / vendor / getrandom / src / windows.rs

diff --git a/vendor/getrandom/src/windows.rs b/vendor/getrandom/src/windows.rs
new file mode 100644 (file)
index 0000000..a5b0565
--- /dev/null
+++ b/vendor/getrandom/src/windows.rs
@@ -0,0 +1,26 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Windows
+use crate::Error;
+
+extern "system" {
+    #[link_name = "SystemFunction036"]
+    fn RtlGenRandom(RandomBuffer: *mut u8, RandomBufferLength: u32) -> u8;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // Prevent overflow of u32
+    for chunk in dest.chunks_mut(u32::max_value() as usize) {
+        let ret = unsafe { RtlGenRandom(chunk.as_mut_ptr(), chunk.len() as u32) };
+        if ret == 0 {
+            return Err(Error::WINDOWS_RTL_GEN_RANDOM);
+        }
+    }
+    Ok(())
+}