From 9688a0ccef9d3b80958b2abdbf30bb821d44af04 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Sat, 21 Nov 2020 00:15:03 +0800
Subject: [PATCH] feat: add main5

---
 __ffi/c_layout/Cargo.lock    | 34 ++++++++++++++++++++++++++++++++++
 __ffi/c_layout/Cargo.toml    |  3 ++-
 __ffi/c_layout/src/main.rs   |  3 +++
 __ffi/c_layout/src/main_5.rs | 24 ++++++++++++++++++++++++
 4 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 __ffi/c_layout/src/main_5.rs

diff --git a/__ffi/c_layout/Cargo.lock b/__ffi/c_layout/Cargo.lock
index 808b026..e9aa941 100644
--- a/__ffi/c_layout/Cargo.lock
+++ b/__ffi/c_layout/Cargo.lock
@@ -22,6 +22,7 @@ version = "0.1.0"
 dependencies = [
  "bincode",
  "serde",
+ "zerocopy",
 ]
 
 [[package]]
@@ -73,8 +74,41 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unicode-xid",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "zerocopy"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6580539ad917b7c026220c4b3f2c08d52ce54d6ce0dc491e66002e35388fab46"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d498dbd1fd7beb83c86709ae1c33ca50942889473473d287d56ce4770a18edfb"
+dependencies = [
+ "proc-macro2",
+ "syn",
+ "synstructure",
+]
diff --git a/__ffi/c_layout/Cargo.toml b/__ffi/c_layout/Cargo.toml
index af17453..61258df 100644
--- a/__ffi/c_layout/Cargo.toml
+++ b/__ffi/c_layout/Cargo.toml
@@ -8,4 +8,5 @@ edition = "2018"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
-bincode = "*"
\ No newline at end of file
+bincode = "*"
+zerocopy = "0.3.0"
diff --git a/__ffi/c_layout/src/main.rs b/__ffi/c_layout/src/main.rs
index 84c74a8..7852d4d 100644
--- a/__ffi/c_layout/src/main.rs
+++ b/__ffi/c_layout/src/main.rs
@@ -2,6 +2,7 @@ mod main_1;
 mod main_2;
 mod main_3;
 mod main_4;
+mod main_5;
 
 fn main() {
     println!("{}", "-".repeat(88));
@@ -12,4 +13,6 @@ fn main() {
     main_3::run_main();
     println!("{}", "-".repeat(88));
     main_4::run_main();
+    println!("{}", "-".repeat(88));
+    main_5::run_main();
 }
\ No newline at end of file
diff --git a/__ffi/c_layout/src/main_5.rs b/__ffi/c_layout/src/main_5.rs
new file mode 100644
index 0000000..7694eb3
--- /dev/null
+++ b/__ffi/c_layout/src/main_5.rs
@@ -0,0 +1,24 @@
+use zerocopy::FromBytes;
+use zerocopy::AsBytes;
+// use zerocopy::Unaligned;
+use zerocopy::LayoutVerified;
+use std::ops::Deref;
+
+#[derive(FromBytes, AsBytes, Debug)]
+#[repr(C)]
+struct Header {
+    name: [u8; 4],
+    size: u32,
+    reserved: u64,
+}
+
+pub fn run_main() {
+    let h = Header {
+        name: [1,2,3,4],
+        size: 0xabcdef,
+        reserved: 0x0123456789abcdef,
+    };
+    println!("{:?}", h.as_bytes());
+    let h2: Option<LayoutVerified<&[u8], [Header]>> = LayoutVerified::new_slice(h.as_bytes());
+    println!("{:?}", h2.unwrap().deref()[0]);
+}