From 6c780a56f1156ede5f4a4027f13ba92ac3b9c27f Mon Sep 17 00:00:00 2001
From: widberg <jaredwidberg@gmail.com>
Date: Sun, 22 Oct 2023 10:26:34 -0400
Subject: [PATCH] Add a size method to Resource.

---
 bff/src/bigfile/resource.rs | 11 +++++++++++
 bff/src/crc/blacksheep32.rs |  7 +++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/bff/src/bigfile/resource.rs b/bff/src/bigfile/resource.rs
index c5038e0..d8d59a3 100644
--- a/bff/src/bigfile/resource.rs
+++ b/bff/src/bigfile/resource.rs
@@ -20,3 +20,14 @@ pub struct Resource {
     pub name: Name,
     pub data: ResourceData,
 }
+
+impl Resource {
+    pub fn size(&self) -> usize {
+        match &self.data {
+            ResourceData::Data(data) | ResourceData::CompressibleData { data, .. } => data.len(),
+            ResourceData::ExtendedData {
+                link_header, body, ..
+            } => link_header.len() + body.len(),
+        }
+    }
+}
diff --git a/bff/src/crc/blacksheep32.rs b/bff/src/crc/blacksheep32.rs
index 966c543..41f021c 100644
--- a/bff/src/crc/blacksheep32.rs
+++ b/bff/src/crc/blacksheep32.rs
@@ -1,6 +1,9 @@
 use crate::traits::NameHashFunction;
 
-// IEEE 802.3 CRC32 Lookup Table
+// This algorithm is also used by Ubisoft
+
+// Appears to be the same as FreeBSD
+// https://github.com/lattera/freebsd/blob/401a161083850a9a4ce916f37520c084cff1543b/sys/libkern/crc32.c#L51-L95
 const CRC32_TABLE: [u32; 256] = [
     0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
     0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
@@ -40,7 +43,7 @@ pub const fn blacksheep32(bytes: &[u8]) -> i32 {
     blacksheep32_options(bytes, 0)
 }
 
-// IEEE 802.3 CRC32
+// https://github.com/lattera/freebsd/blob/401a161083850a9a4ce916f37520c084cff1543b/sys/libkern/crc32.c#L103-L113
 pub const fn blacksheep32_options(bytes: &[u8], starting: i32) -> i32 {
     let mut hash = !starting as u32;
     let mut i: usize = 0;