Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/third_party/rust/byte-tools/src/lib.rs b/third_party/rust/byte-tools/src/lib.rs
new file mode 100644
index 0000000000..b4a450f9fb
--- /dev/null
+++ b/third_party/rust/byte-tools/src/lib.rs
@@ -0,0 +1,29 @@
+#![no_std]
+use core::ptr;
+
+/// Copy bytes from `src` to `dst`
+///
+/// Panics if `src.len() < dst.len()`
+#[inline(always)]
+pub fn copy(src: &[u8], dst: &mut [u8]) {
+    assert!(dst.len() >= src.len());
+    unsafe {
+        ptr::copy_nonoverlapping(src.as_ptr(), dst.as_mut_ptr(), src.len());
+    }
+}
+
+/// Zero all bytes in `dst`
+#[inline(always)]
+pub fn zero(dst: &mut [u8]) {
+    unsafe {
+        ptr::write_bytes(dst.as_mut_ptr(), 0, dst.len());
+    }
+}
+
+/// Sets all bytes in `dst` equal to `value`
+#[inline(always)]
+pub fn set(dst: &mut [u8], value: u8) {
+    unsafe {
+        ptr::write_bytes(dst.as_mut_ptr(), value, dst.len());
+    }
+}