Andes Firmware Image layout as seen in MT76 Wifi Chipsets: Java parsing library

Firmware image found with MediaTek MT76xx wifi chipsets.


Firmware Image wifi chipset

KS implementation details

License: CC0-1.0

This page hosts a formal specification of Andes Firmware Image layout as seen in MT76 Wifi Chipsets using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.


Runtime library

All parsing code for Java generated by Kaitai Struct depends on the Java runtime library. You have to install it before you can parse data.

The Java runtime library is published in the Maven Central Repository. Refer to the artifact page for instructions how to add it into your project with the build tool that you use.


Parse a local file and get structure in memory:

AndesFirmware data = AndesFirmware.fromFile("path/to/local/file.bin");

Or parse structure from a byte array:

byte[] someArray = new byte[] { ... };
AndesFirmware data = new AndesFirmware(new ByteBufferKaitaiStream(someArray));

After that, one can get various attributes from the structure by invoking getter methods like:

data.imageHeader() // => get image header

Java source code to parse Andes Firmware Image layout as seen in MT76 Wifi Chipsets

// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

import io.kaitai.struct.ByteBufferKaitaiStream;
import io.kaitai.struct.KaitaiStruct;
import io.kaitai.struct.KaitaiStream;
import java.nio.charset.Charset;

 * Firmware image found with MediaTek MT76xx wifi chipsets.
public class AndesFirmware extends KaitaiStruct {
    public static AndesFirmware fromFile(String fileName) throws IOException {
        return new AndesFirmware(new ByteBufferKaitaiStream(fileName));

    public AndesFirmware(KaitaiStream _io) {
        this(_io, null, null);

    public AndesFirmware(KaitaiStream _io, KaitaiStruct _parent) {
        this(_io, _parent, null);

    public AndesFirmware(KaitaiStream _io, KaitaiStruct _parent, AndesFirmware _root) {
        this._parent = _parent;
        this._root = _root == null ? this : _root;
    private void _read() {
        this._raw_imageHeader = this._io.readBytes(32);
        KaitaiStream _io__raw_imageHeader = new ByteBufferKaitaiStream(_raw_imageHeader);
        this.imageHeader = new ImageHeader(_io__raw_imageHeader, this, _root);
        this.ilm = this._io.readBytes(imageHeader().ilmLen());
        this.dlm = this._io.readBytes(imageHeader().dlmLen());
    public static class ImageHeader extends KaitaiStruct {
        public static ImageHeader fromFile(String fileName) throws IOException {
            return new ImageHeader(new ByteBufferKaitaiStream(fileName));

        public ImageHeader(KaitaiStream _io) {
            this(_io, null, null);

        public ImageHeader(KaitaiStream _io, AndesFirmware _parent) {
            this(_io, _parent, null);

        public ImageHeader(KaitaiStream _io, AndesFirmware _parent, AndesFirmware _root) {
            this._parent = _parent;
            this._root = _root;
        private void _read() {
            this.ilmLen = this._io.readU4le();
            this.dlmLen = this._io.readU4le();
            this.fwVer = this._io.readU2le();
            this.buildVer = this._io.readU2le();
            this.extra = this._io.readU4le();
            this.buildTime = new String(this._io.readBytes(16), Charset.forName("UTF-8"));
        private long ilmLen;
        private long dlmLen;
        private int fwVer;
        private int buildVer;
        private long extra;
        private String buildTime;
        private AndesFirmware _root;
        private AndesFirmware _parent;
        public long ilmLen() { return ilmLen; }
        public long dlmLen() { return dlmLen; }
        public int fwVer() { return fwVer; }
        public int buildVer() { return buildVer; }
        public long extra() { return extra; }
        public String buildTime() { return buildTime; }
        public AndesFirmware _root() { return _root; }
        public AndesFirmware _parent() { return _parent; }
    private ImageHeader imageHeader;
    private byte[] ilm;
    private byte[] dlm;
    private AndesFirmware _root;
    private KaitaiStruct _parent;
    private byte[] _raw_imageHeader;
    public ImageHeader imageHeader() { return imageHeader; }
    public byte[] ilm() { return ilm; }
    public byte[] dlm() { return dlm; }
    public AndesFirmware _root() { return _root; }
    public KaitaiStruct _parent() { return _parent; }
    public byte[] _raw_imageHeader() { return _raw_imageHeader; }