Fix BinaryReader and BinaryWriter not respecting image base in Rust API

Author: emesare

rust/src/binary_reader.rs

@@ -105,6 +105,8 @@ impl Seek for BinaryReader {
             SeekFrom::Current(offset) => self.seek_to_relative_offset(offset),
             SeekFrom::Start(offset) => self.seek_to_offset(offset),
             SeekFrom::End(end_offset) => {
+                // We do NOT need to add the image base here as
+                // the reader (unlike the writer) can set the virtual base.
                 let offset =
                     self.view
                         .len()

rust/src/binary_writer.rs

@@ -17,7 +17,7 @@
 use binaryninjacore_sys::*;
 use std::fmt::Debug;
 
-use crate::binary_view::{BinaryView, BinaryViewBase};
+use crate::binary_view::{BinaryView, BinaryViewBase, BinaryViewExt};
 use crate::Endianness;
 
 use crate::rc::Ref;
@@ -85,14 +85,13 @@ impl Seek for BinaryWriter {
             SeekFrom::Current(offset) => self.seek_to_relative_offset(offset),
             SeekFrom::Start(offset) => self.seek_to_offset(offset),
             SeekFrom::End(end_offset) => {
-                let offset =
-                    self.view
-                        .len()
-                        .checked_add_signed(end_offset)
-                        .ok_or(std::io::Error::new(
-                            ErrorKind::Other,
-                            "Seeking from end overflowed",
-                        ))?;
+                let view_end = self.view.original_image_base() + self.view.len();
+                let offset = view_end
+                    .checked_add_signed(end_offset)
+                    .ok_or(std::io::Error::new(
+                        ErrorKind::Other,
+                        "Seeking from end overflowed",
+                    ))?;
                 self.seek_to_offset(offset);
             }
         };

rust/tests/binary_reader.rs

@@ -1,5 +1,5 @@
 use binaryninja::binary_reader::BinaryReader;
-use binaryninja::binary_view::BinaryViewBase;
+use binaryninja::binary_view::{BinaryViewBase, BinaryViewExt};
 use binaryninja::headless::Session;
 use rstest::*;
 use std::io::{Read, Seek, SeekFrom};
@@ -55,6 +55,9 @@ fn test_binary_reader_read(_session: &Session) {
     let view = binaryninja::load(out_dir.join("atox.obj")).expect("Failed to create view");
     let mut reader = BinaryReader::new(&view);
 
+    // We want to do seeks with the image base.
+    reader.set_virtual_base(view.original_image_base());
+
     reader
         .seek(SeekFrom::Start(0))
         .expect("Failed to seek to start");

rust/tests/binary_writer.rs

@@ -1,5 +1,5 @@
 use binaryninja::binary_reader::BinaryReader;
-use binaryninja::binary_view::BinaryViewBase;
+use binaryninja::binary_view::{BinaryViewBase, BinaryViewExt};
 use binaryninja::binary_writer::BinaryWriter;
 use binaryninja::headless::Session;
 use rstest::*;
@@ -17,7 +17,7 @@ fn test_binary_writer_seek(_session: &Session) {
     let out_dir = env!("OUT_DIR").parse::<PathBuf>().unwrap();
     let view = binaryninja::load(out_dir.join("atox.obj")).expect("Failed to create view");
     let mut writer = BinaryWriter::new(&view);
-    let end_offset = view.len();
+    let end_offset = view.original_image_base() + view.len();
 
     // Test seeking to a specific position
     writer