Use Rc<RefCell<T>>> for content_records so that they sync in a Title

When using a Title, the content_records value stored in the TMD and ContentRegion instances will now point to the same data, meaning that they stay in sync. Previously, you had to manually sync the content records between them as they were modified, and not doing so would cause problems when editing a WAD.

src/title/tmd.rs

@@ -3,9 +3,11 @@
 //
 // Implements the structures and methods required for TMD parsing and editing.
 
+use std::cell::RefCell;
 use std::fmt;
 use std::io::{Cursor, Read, Write};
 use std::ops::Index;
+use std::rc::Rc;
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use sha1::{Sha1, Digest};
 use thiserror::Error;
@@ -110,7 +112,7 @@ pub struct TMD {
     pub num_contents: u16,
     pub boot_index: u16,
     pub minor_version: u16, // Normally unused, but good for fakesigning!
-    pub content_records: Vec<ContentRecord>,
+    pub content_records: Rc<RefCell<Vec<ContentRecord>>>,
 }
 
 impl TMD {
@@ -204,7 +206,7 @@ impl TMD {
             num_contents,
             boot_index,
             minor_version,
-            content_records,
+            content_records: Rc::new(RefCell::new(content_records)),
         })
     }
     
@@ -231,11 +233,11 @@ impl TMD {
         buf.write_all(&self.reserved2)?;
         buf.write_u32::<BigEndian>(self.access_rights)?;
         buf.write_u16::<BigEndian>(self.title_version)?;
-        buf.write_u16::<BigEndian>(self.num_contents)?;
+        buf.write_u16::<BigEndian>(self.content_records.borrow().len() as u16)?;
         buf.write_u16::<BigEndian>(self.boot_index)?;
         buf.write_u16::<BigEndian>(self.minor_version)?;
         // Iterate over content records and write out content record data.
-        for content in &self.content_records {
+        for content in self.content_records.borrow().iter() {
             buf.write_u32::<BigEndian>(content.content_id)?;
             buf.write_u16::<BigEndian>(content.index)?;
             match content.content_type {
@@ -317,11 +319,11 @@ impl TMD {
         // Find possible content indices, because the provided one could exist while the indices
         // are out of order, which could cause problems finding the content.
         let mut content_indices = Vec::new();
-        for record in &self.content_records {
+        for record in self.content_records.borrow().iter() {
             content_indices.push(record.index);
         }
         let target_index = content_indices.index(index);
-        match self.content_records[*target_index as usize].content_type {
+        match self.content_records.borrow()[*target_index as usize].content_type {
             ContentType::Normal => ContentType::Normal,
             ContentType::Development => ContentType::Development,
             ContentType::HashTree => ContentType::HashTree,