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// Copyright 2021-2026 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::{ErrorKind, Read, Seek, SeekFrom, Write};
use std::marker::PhantomData;
use std::slice;
pub trait Accessor: Read + Write + Seek + Sized {}
impl<T: Read + Write + Seek + Sized> Accessor for T {}
pub struct FileAccessor<A: Accessor> {
pub(crate) raw: BNFileAccessor,
accessor: PhantomData<A>,
}
impl<A: Accessor> FileAccessor<A> {
pub fn new(accessor: A) -> Self {
use std::os::raw::c_void;
extern "C" fn cb_get_length<A: Accessor>(ctxt: *mut c_void) -> u64 {
let f = unsafe { &mut *(ctxt as *mut A) };
f.seek(SeekFrom::End(0)).unwrap_or(0)
}
extern "C" fn cb_read<A: Accessor>(
ctxt: *mut c_void,
dest: *mut c_void,
offset: u64,
len: usize,
) -> usize {
let f = unsafe { &mut *(ctxt as *mut A) };
let dest = unsafe { slice::from_raw_parts_mut(dest as *mut u8, len) };
if f.seek(SeekFrom::Start(offset)).is_err() {
0
} else {
f.read(dest).unwrap_or(0)
}
}
extern "C" fn cb_write<A: Accessor>(
ctxt: *mut c_void,
offset: u64,
src: *const c_void,
len: usize,
) -> usize {
let f = unsafe { &mut *(ctxt as *mut A) };
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)
}
}
let boxed_accessor = Box::new(accessor);
let leaked_accessor = Box::leak(boxed_accessor);
Self {
raw: BNFileAccessor {
context: leaked_accessor as *mut A as *mut _,
getLength: Some(cb_get_length::<A>),
read: Some(cb_read::<A>),
write: Some(cb_write::<A>),
},
accessor: PhantomData,
}
}
pub fn read(&self, addr: u64, len: usize) -> Result<Vec<u8>, ErrorKind> {
let cb_read = self.raw.read.unwrap();
let mut buf = vec![0; len];
let read_len = unsafe { cb_read(self.raw.context, buf.as_mut_ptr() as *mut _, addr, len) };
if read_len != len {
return Err(ErrorKind::UnexpectedEof);
}
Ok(buf)
}
pub fn write(&self, addr: u64, data: &[u8]) -> usize {
let cb_write = self.raw.write.unwrap();
unsafe {
cb_write(
self.raw.context,
addr,
data.as_ptr() as *const _,
data.len(),
)
}
}
pub fn length(&self) -> u64 {
let cb_get_length = self.raw.getLength.unwrap();
unsafe { cb_get_length(self.raw.context) }
}
}
impl<A: Accessor> Drop for FileAccessor<A> {
fn drop(&mut self) {
unsafe {
let _ = Box::from_raw(self.raw.context as *mut A);
}
}
}
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