From e87a7fba2c4d374942fa55e65796122d4e9ea5da Mon Sep 17 00:00:00 2001
From: Florian Stecker <oss@florianstecker.net>
Date: Wed, 6 Mar 2024 22:23:50 -0500
Subject: [PATCH] 32 bit checksums

---
 btrfs_explorer/src/btrfs_structs.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/btrfs_explorer/src/btrfs_structs.rs b/btrfs_explorer/src/btrfs_structs.rs
index c394831..34d686a 100644
--- a/btrfs_explorer/src/btrfs_structs.rs
+++ b/btrfs_explorer/src/btrfs_structs.rs
@@ -1,6 +1,5 @@
 use btrfs_parse_derive::AllVariants;
 use btrfs_parse_derive::ParseBin;
-use std::any::TypeId;
 use std::fmt;
 use std::error;
 use std::ffi::CString;
@@ -97,6 +96,7 @@ pub enum Value {
 	ExtentData(ExtentDataItem),
 	Ref(Vec<RefItem>),
 	RootRef(Vec<RootRefItem>),
+	Checksum(Vec<u32>),
 	Unknown(Vec<u8>),
 }
 
@@ -482,7 +482,7 @@ impl From<&str> for ParseError {
 	}
 }
 
-pub trait ParseBin where Self: Sized {
+pub trait ParseBin: Sized {
 	fn parse_len(bytes: &[u8]) -> Result<(Self, usize), ParseError>;
 
 	fn parse(bytes: &[u8]) -> Result<Self, ParseError> {
@@ -692,6 +692,13 @@ impl ParseBin for Node {
 						}
 						Value::RootRef(result)
 					},
+					ItemType::ExtentCsum => {
+						let mut checksums: Vec<u32> = Vec::new();
+						for i in 0..data_slice.len()/4 {
+							checksums.push(u32::from_le_bytes(data_slice[i*4 .. (i+1)*4].try_into().unwrap()));
+						}
+						Value::Checksum(checksums)
+					},
 					_ =>
 						Value::Unknown(Vec::from(data_slice)),
 				};