Add novatek extractor

src/formats/novatek.rs

@@ -0,0 +1,69 @@
+use std::fs::File;
+use std::path::Path;
+use std::fs::{self, OpenOptions};
+use std::io::{Write, Seek};
+
+use crate::common;
+
+pub fn is_novatek_file(file: &File) -> bool {
+    let header = common::read_file(&file, 0, 4).expect("Failed to read from file.");
+    let header_string = String::from_utf8_lossy(&header);
+
+    if header_string == "NFWB"{
+        true
+    } else {
+        false
+    }
+}
+
+pub fn extract_novatek(mut file: &File, output_folder: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let _magic = common::read_exact(&mut file, 4)?; //NFWB magic
+    let _flags = common::read_exact(&mut file, 4)?;
+    let _header_size = common::read_exact(&mut file, 4)?;
+    let _ = common::read_exact(&mut file, 40)?; //unknown
+
+    let part_count_bytes = common::read_exact(&mut file, 4)?;
+    let part_count = u32::from_le_bytes(part_count_bytes.try_into().unwrap());
+
+    let _first_part_offset = common::read_exact(&mut file, 4)?;
+
+    println!("Part count: {}", part_count);
+
+    let _ = common::read_exact(&mut file, 116)?;
+
+    for i in 0..part_count {
+        let _ = common::read_exact(&mut file, 16)?; //unknown
+
+        let index_bytes = common::read_exact(&mut file, 4)?;
+        let index = u32::from_le_bytes(index_bytes.try_into().unwrap());
+
+        let size_bytes = common::read_exact(&mut file, 4)?;
+        let size = u32::from_le_bytes(size_bytes.try_into().unwrap());
+
+        let offset_bytes = common::read_exact(&mut file, 4)?;
+        let offset = u32::from_le_bytes(offset_bytes.try_into().unwrap());
+
+        let current_pos = file.stream_position()?;
+
+        let data = common::read_file(&file, offset as u64, size as usize)?;
+
+        println!("- Part {}: index: {}, size: {}, offset: {}", i + 1, index, size, offset);
+
+        let output_path = Path::new(&output_folder).join(format!("part_{}.bin", i + 1));
+
+        fs::create_dir_all(&output_folder)?;
+        let mut out_file = OpenOptions::new()
+            .write(true)
+            .create(true)
+            .open(output_path)?;
+            
+        out_file.write_all(&data)?;
+
+        println!("-- Saved file!");
+
+        file.seek(std::io::SeekFrom::Start(current_pos))?;
+
+    }
+
+    Ok(())
+}