add test

androscalpel_serializer/src/file_reader.rs

@@ -50,7 +50,9 @@ impl<'a> DexFileReader<'a> {
             method_handles: vec![],
             map_list: MapList { list: vec![] },
         };
-        tmp_file.map_list = tmp_file.get_struct_at_offset(tmp_file.header.map_off)?;
+        if tmp_file.header.map_off != 0 {
+            tmp_file.map_list = tmp_file.get_struct_at_offset(tmp_file.header.map_off)?;
+        }
         tmp_file.string_ids = tmp_file.get_item_list::<StringIdItem>(
             tmp_file.header.string_ids_off,
             tmp_file.header.string_ids_size,
@@ -365,6 +367,9 @@ impl<'a> DexFileReader<'a> {
     }
 
     fn get_item_list<T: Serializable>(&self, offset: u32, size: u32) -> Result<Vec<T>> {
+        if offset == 0 {
+            return Ok(vec![]);
+        }
         let mut buffer = Cursor::new(self.data);
         buffer.seek(SeekFrom::Start(offset as u64)).map_err(|err| {
             Error::DeserializationError(format!("Failed to seek 0x{offset:x} position: {err}"))

androscalpel_serializer/src/items/map.rs

@@ -71,6 +71,36 @@ pub enum MapItemType {
     UnkownType(u16),
 }
 
+impl MapItemType {
+    /// If data of this type is stored in the data section
+    pub fn is_data_section_type(&self) -> bool {
+        match self {
+            Self::HeaderItem => false,
+            Self::StringIdItem => false,
+            Self::TypeIdItem => false,
+            Self::ProtoIdItem => false,
+            Self::FieldIdItem => false,
+            Self::MethodIdItem => false,
+            Self::ClassDefItem => false,
+            Self::CallSiteIdItem => true,
+            Self::MethodHandleItem => true,
+            Self::MapList => true,
+            Self::TypeList => true,
+            Self::AnnotationSetRefList => true,
+            Self::AnnotationSetItem => true,
+            Self::ClassDataItem => true,
+            Self::CodeItem => true,
+            Self::StringDataItem => true,
+            Self::DebugInfoItem => true,
+            Self::AnnotationItem => true,
+            Self::EncodedArrayItem => true,
+            Self::AnnotationsDirectoryItem => true,
+            Self::HiddenapiClassDataItem => true,
+            Self::UnkownType(_) => true, // Most likely
+        }
+    }
+}
+
 impl MapList {
     /// The size field of a MapList.
     pub fn size_field(&self) -> u32 {