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use binaryninjacore_sys::BNFileAccessor;
use std::io::{Read, Write, Seek, SeekFrom};
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) };
match f.seek(SeekFrom::End(0)) {
Ok(len) => len,
Err(_) => 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_ok() {
debug!("Failed to seek to offset {:x}", offset);
return 0;
}
match f.read(dest) {
Ok(len) => len,
Err(_) => 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_ok() {
return 0;
}
match f.write(src) {
Ok(len) => len,
Err(_) => 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,
}
}
}
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