init

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/mem.rs

@@ -0,0 +1,14 @@
+/// SAFETY: the returned Vec must not be resized or reserverd
+pub unsafe fn aligned_u8_vec(cap: usize, align: usize) -> Vec<u8> {
+    use std::alloc::*;
+
+    let layout =
+        Layout::from_size_align(cap, align).expect("invalid aligned value, must be power of 2");
+    unsafe {
+        let ptr = alloc(layout);
+        if ptr.is_null() {
+            panic!("failed to allocate {} bytes", cap);
+        }
+        Vec::from_raw_parts(ptr, 0, cap)
+    }
+}