From ed6ed7a62217369544f3e31ef9a886f459f0c21b Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Sat, 15 Mar 2025 21:31:40 +0100
Subject: assetbundle struct to abstract over unityfs and serializedfile

---
 src/assetbundle.rs           | 56 ++++++++++++++++++++++++++++++++++++++++++++
 src/classes/pptr.rs          | 19 +++++++--------
 src/classes/streaminginfo.rs |  2 +-
 src/lib.rs                   |  1 +
 src/scene/mod.rs             |  1 -
 src/serialized_file.rs       |  7 ++++++
 6 files changed, 74 insertions(+), 12 deletions(-)
 create mode 100644 src/assetbundle.rs
 delete mode 100644 src/scene/mod.rs

(limited to 'src')

diff --git a/src/assetbundle.rs b/src/assetbundle.rs
new file mode 100644
index 0000000..e10a8f3
--- /dev/null
+++ b/src/assetbundle.rs
@@ -0,0 +1,56 @@
+use crate::{
+    classes::pptr::PPtr,
+    serialized_file::SerializedFile,
+    unityfs::{NodeReader, UnityFS, block_reader::BlockReader, multi_reader::MultiReader},
+};
+use anyhow::{Context, Result, anyhow};
+use std::{
+    io::{Read, Seek},
+    marker::PhantomData,
+};
+
+/// High-level wrapper around UnityFS, SerializedFile and all the classes.
+pub struct AssetBundle<T> {
+    pub fs: UnityFS<T>,
+    pub(crate) main: SerializedFile<NodeReader<BlockReader<MultiReader<T>>>>,
+    pub(crate) shared_assets: Option<SerializedFile<NodeReader<BlockReader<MultiReader<T>>>>>,
+}
+
+impl<T: Read + Seek> AssetBundle<T> {
+    pub fn open(inner: T) -> Result<Self> {
+        let fs = UnityFS::open(inner).context("opening UnityFS")?;
+        let main_ni = fs
+            .find_main_file()
+            .ok_or(anyhow!("AssetBundle seems to lack main file"))?;
+        let main = SerializedFile::read(fs.read(main_ni)?)?;
+        let shared_assets = if let Some(n) = main.find_fs_shared_assets(&fs) {
+            Some(SerializedFile::read(fs.read(&n)?)?)
+        } else {
+            None
+        };
+        Ok(Self {
+            fs,
+            main,
+            shared_assets,
+        })
+    }
+
+    pub fn all_toplevel_of_class(&self, class_name: &str) -> impl Iterator<Item = PPtr> {
+        self.main
+            .all_objects_of_class(class_name)
+            .map(|o| (0, o))
+            .chain(
+                self.shared_assets
+                    .as_ref()
+                    .map(|e| e.all_objects_of_class(class_name).map(|o| (1, o)))
+                    .into_iter()
+                    .flatten(),
+            )
+            .map(|(fi, o)| PPtr {
+                class: class_name.to_owned(),
+                file_id: fi,
+                path_id: o.path_id,
+                _class: PhantomData,
+            })
+    }
+}
diff --git a/src/classes/pptr.rs b/src/classes/pptr.rs
index 9b54cbb..366e17c 100644
--- a/src/classes/pptr.rs
+++ b/src/classes/pptr.rs
@@ -1,6 +1,6 @@
 use crate::{
+    assetbundle::AssetBundle,
     object::{Value, parser::FromValue},
-    serialized_file::SerializedFile,
 };
 use anyhow::{Result, anyhow, bail};
 use log::debug;
@@ -13,7 +13,7 @@ use std::{
 #[derive(Debug, Serialize)]
 pub struct PPtr<T = Value> {
     #[serde(skip, default)]
-    _class: PhantomData<T>,
+    pub(crate) _class: PhantomData<T>,
     pub class: String,
     pub file_id: i32,
     pub path_id: i64,
@@ -54,27 +54,26 @@ impl<T: FromValue> PPtr<T> {
     pub fn is_null(&self) -> bool {
         self.path_id == 0 && self.file_id == 0
     }
-    pub fn load(
-        &self,
-        file: &mut SerializedFile<impl Read + Seek>,
-        shared_assets: Option<&mut SerializedFile<impl Read + Seek>>,
-    ) -> Result<T> {
+    pub fn load(&self, bundle: &mut AssetBundle<impl Read + Seek>) -> Result<T> {
         debug!(
             "loading PPtr<{}> file_id={} path_id={}",
             self.class, self.file_id, self.path_id
         );
         match self.file_id {
             0 => {
-                let ob = file
+                let ob = bundle
+                    .main
                     .objects
                     .iter()
                     .find(|o| o.path_id == self.path_id)
                     .ok_or(anyhow!("object with path id {} not found", self.path_id))?
                     .to_owned();
-                file.read_object(ob)?.parse()
+                bundle.main.read_object(ob)?.parse()
             }
             1 => {
-                let file = shared_assets.unwrap();
+                let file = bundle.shared_assets.as_mut().ok_or(anyhow!(
+                    "shared assets referenced but not included in bundle"
+                ))?;
                 let ob = file
                     .objects
                     .iter()
diff --git a/src/classes/streaminginfo.rs b/src/classes/streaminginfo.rs
index 21029f4..e308f1c 100644
--- a/src/classes/streaminginfo.rs
+++ b/src/classes/streaminginfo.rs
@@ -26,7 +26,7 @@ impl FromValue for StreamingInfo {
 }
 
 impl StreamingInfo {
-    pub fn read(&self, fs: &mut UnityFS<impl Read + Seek>) -> Result<Vec<u8>> {
+    pub fn read(&self, fs: &UnityFS<impl Read + Seek>) -> Result<Vec<u8>> {
         if !self.path.starts_with("archive:") {
             bail!("StreamingInfo path does not start on archive:")
         }
diff --git a/src/lib.rs b/src/lib.rs
index f01eaae..68e80f4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,3 +5,4 @@ pub mod helper;
 pub mod object;
 pub mod serialized_file;
 pub mod unityfs;
+pub mod assetbundle;
diff --git a/src/scene/mod.rs b/src/scene/mod.rs
deleted file mode 100644
index 8b13789..0000000
--- a/src/scene/mod.rs
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/src/serialized_file.rs b/src/serialized_file.rs
index a6514ee..aba72b9 100644
--- a/src/serialized_file.rs
+++ b/src/serialized_file.rs
@@ -345,6 +345,13 @@ impl<T: Read + Seek> SerializedFile<T> {
             .ok_or(anyhow!("type tree missing"))?;
         Value::read(typetree, self.endianness, &mut self.file)
     }
+
+    pub fn all_objects_of_class(&self, class_name: &str) -> impl Iterator<Item = &ObjectInfo> {
+        self.objects.iter().filter(move |o| {
+            self.get_object_type_tree(&o)
+                .map_or(false, |t| t.type_string == class_name)
+        })
+    }
 }
 
 impl TypeTreeNode {
-- 
cgit v1.2.3-70-g09d2