initial commit

src/binarywriter.rs

@@ -0,0 +1,99 @@
+// Copyright 2022-2024 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.
+
+//! A convenience class for writing binary data
+
+use binaryninjacore_sys::*;
+
+use crate::binaryview::BinaryView;
+use crate::Endianness;
+
+use std::io::{Seek, SeekFrom, Write};
+
+pub struct BinaryWriter {
+    handle: *mut BNBinaryWriter,
+}
+
+impl BinaryWriter {
+    pub fn new(view: &BinaryView, endian: Endianness) -> Self {
+        let handle = unsafe { BNCreateBinaryWriter(view.handle) };
+        unsafe {
+            BNSetBinaryWriterEndianness(handle, endian);
+        }
+        Self { handle }
+    }
+
+    pub fn endian(&self) -> Endianness {
+        unsafe { BNGetBinaryWriterEndianness(self.handle) }
+    }
+
+    pub fn set_endian(&self, endian: Endianness) {
+        unsafe { BNSetBinaryWriterEndianness(self.handle, endian) }
+    }
+
+    pub fn offset(&self) -> u64 {
+        unsafe { BNGetWriterPosition(self.handle) }
+    }
+}
+
+impl Seek for BinaryWriter {
+    /// Seek to the specified position.
+    ///
+    /// # Errors
+    /// Seeking relative to [SeekFrom::End] is unsupported and will return an error.
+    fn seek(&mut self, pos: SeekFrom) -> std::io::Result<u64> {
+        unsafe {
+            match pos {
+                SeekFrom::Current(offset) => BNSeekBinaryWriterRelative(self.handle, offset),
+                SeekFrom::Start(offset) => BNSeekBinaryWriter(self.handle, offset),
+                _ => {
+                    return Err(std::io::Error::new(
+                        std::io::ErrorKind::Unsupported,
+                        "Cannot seek end of BinaryWriter",
+                    ))
+                }
+            };
+        }
+
+        Ok(self.offset())
+    }
+}
+
+impl Write for BinaryWriter {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        let len = buf.len();
+        let result = unsafe { BNWriteData(self.handle, buf.as_ptr() as *mut _, len) };
+        if !result {
+            Err(std::io::Error::new(
+                std::io::ErrorKind::Other,
+                "write out of bounds",
+            ))
+        } else {
+            Ok(len)
+        }
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        Ok(())
+    }
+}
+
+impl Drop for BinaryWriter {
+    fn drop(&mut self) {
+        unsafe { BNFreeBinaryWriter(self.handle) }
+    }
+}
+
+unsafe impl Sync for BinaryWriter {}
+unsafe impl Send for BinaryWriter {}