1 files changed, 90 insertions, 0 deletions
diff --git a/rust/src/file_accessor.rs b/rust/src/file_accessor.rs
new file mode 100644
index 00000000..3f324710
--- /dev/null
+++ b/rust/src/file_accessor.rs
@@ -0,0 +1,90 @@
+// Copyright 2021-2024 Vector 35 Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use binaryninjacore_sys::BNFileAccessor;
+use std::io::{Read, Seek, SeekFrom, Write};
+use std::marker::PhantomData;
+use std::slice;
+
+pub struct FileAccessor<'a> {
+    pub(crate) api_object: BNFileAccessor,
+    _ref: PhantomData<&'a mut ()>,
+}
+
+impl<'a> FileAccessor<'a> {
+    pub fn new<F>(f: &'a mut F) -> Self
+    where
+        F: 'a + Read + Write + Seek + Sized,
+    {
+        use std::os::raw::c_void;
+
+        extern "C" fn cb_get_length<F>(ctxt: *mut c_void) -> u64
+        where
+            F: Read + Write + Seek + Sized,
+        {
+            let f = unsafe { &mut *(ctxt as *mut F) };
+
+            f.seek(SeekFrom::End(0)).unwrap_or(0)
+        }
+
+        extern "C" fn cb_read<F>(
+            ctxt: *mut c_void,
+            dest: *mut c_void,
+            offset: u64,
+            len: usize,
+        ) -> usize
+        where
+            F: Read + Write + Seek + Sized,
+        {
+            let f = unsafe { &mut *(ctxt as *mut F) };
+            let dest = unsafe { slice::from_raw_parts_mut(dest as *mut u8, len) };
+
+            if f.seek(SeekFrom::Start(offset)).is_err() {
+                log::debug!("Failed to seek to offset {:x}", offset);
+                0
+            } else {
+                f.read(dest).unwrap_or(0)
+            }
+        }
+
+        extern "C" fn cb_write<F>(
+            ctxt: *mut c_void,
+            offset: u64,
+            src: *const c_void,
+            len: usize,
+        ) -> usize
+        where
+            F: Read + Write + Seek + Sized,
+        {
+            let f = unsafe { &mut *(ctxt as *mut F) };
+            let src = unsafe { slice::from_raw_parts(src as *const u8, len) };
+
+            if f.seek(SeekFrom::Start(offset)).is_err() {
+                0
+            } else {
+                f.write(src).unwrap_or(0)
+            }
+        }
+
+        Self {
+            api_object: BNFileAccessor {
+                context: f as *mut F as *mut _,
+                getLength: Some(cb_get_length::<F>),
+                read: Some(cb_read::<F>),
+                write: Some(cb_write::<F>),
+            },
+            _ref: PhantomData,
+        }
+    }
+}