From 4c42413c1f72ef167c63aa9c961bee9183d94782 Mon Sep 17 00:00:00 2001
From: Brooks <brooks@solana.com>
Date: Fri, 15 Sep 2023 11:09:01 -0400
Subject: [PATCH] Refactors out `unsafe` from MmapAccountHashesFile::read()
 (#33266)

---
 accounts-db/src/accounts_hash.rs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/accounts-db/src/accounts_hash.rs b/accounts-db/src/accounts_hash.rs
index 30b387148..c9fb1aae2 100644
--- a/accounts-db/src/accounts_hash.rs
+++ b/accounts-db/src/accounts_hash.rs
@@ -42,12 +42,9 @@ impl MmapAccountHashesFile {
     /// return a slice of account hashes starting at 'index'
     fn read(&self, index: usize) -> &[Hash] {
         let start = std::mem::size_of::<Hash>() * index;
-        let item_slice: &[u8] = &self.mmap[start..self.count * std::mem::size_of::<Hash>()];
-        let remaining_elements = item_slice.len() / std::mem::size_of::<Hash>();
-        unsafe {
-            let item = item_slice.as_ptr() as *const Hash;
-            std::slice::from_raw_parts(item, remaining_elements)
-        }
+        let end = std::mem::size_of::<Hash>() * self.count;
+        let bytes = &self.mmap[start..end];
+        bytemuck::cast_slice(bytes)
     }
 
     /// write a hash to the end of mmap file.