A bootloader image which only seems to have been used on a few ASUS
devices. The encoding is ASCII, because the releasetools.py script
is written using Python 2, where the default encoding is ASCII.
A test file can be found in the firmware files for the "fugu" device, which can be downloaded from https://developers.google.com/android/images
This page hosts a formal specification of ASUS Fugu bootloader.img format (version 2 and later) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for C# generated by Kaitai Struct depends on the C# runtime library. You have to install it before you can parse data.
The C# runtime library is available in the NuGet Gallery. Installation instructions can also be found there.
Parse a local file and get structure in memory:
var data = AndroidBootldrAsus.FromFile("path/to/local/file.img");
Or parse structure from a byte array:
byte[] someArray = new byte[] { ... };
var data = new AndroidBootldrAsus(new KaitaiStream(someArray));
After that, one can get various attributes from the structure by accessing properties like:
data.Images // => Only three images are included: `ifwi.bin`, `droidboot.img`
and `splashscreen.img`
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
using System.Collections.Generic;
namespace Kaitai
{
/// <summary>
/// A bootloader image which only seems to have been used on a few ASUS
/// devices. The encoding is ASCII, because the `releasetools.py` script
/// is written using Python 2, where the default encoding is ASCII.
///
/// A test file can be found in the firmware files for the "fugu" device,
/// which can be downloaded from <https://developers.google.com/android/images>
/// </summary>
/// <remarks>
/// Reference: <a href="https://android.googlesource.com/device/asus/fugu/+/android-8.1.0_r5/releasetools.py">Source</a>
/// </remarks>
public partial class AndroidBootldrAsus : KaitaiStruct
{
public static AndroidBootldrAsus FromFile(string fileName)
{
return new AndroidBootldrAsus(new KaitaiStream(fileName));
}
public AndroidBootldrAsus(KaitaiStream p__io, KaitaiStruct p__parent = null, AndroidBootldrAsus p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root ?? this;
_read();
}
private void _read()
{
_magic = m_io.ReadBytes(8);
if (!((KaitaiStream.ByteArrayCompare(Magic, new byte[] { 66, 79, 79, 84, 76, 68, 82, 33 }) == 0)))
{
throw new ValidationNotEqualError(new byte[] { 66, 79, 79, 84, 76, 68, 82, 33 }, Magic, M_Io, "/seq/0");
}
_revision = m_io.ReadU2le();
if (!(Revision >= 2))
{
throw new ValidationLessThanError(2, Revision, M_Io, "/seq/1");
}
_reserved1 = m_io.ReadU2le();
_reserved2 = m_io.ReadU4le();
_images = new List<Image>();
for (var i = 0; i < 3; i++)
{
_images.Add(new Image(m_io, this, m_root));
}
}
public partial class Image : KaitaiStruct
{
public static Image FromFile(string fileName)
{
return new Image(new KaitaiStream(fileName));
}
public Image(KaitaiStream p__io, AndroidBootldrAsus p__parent = null, AndroidBootldrAsus p__root = null) : base(p__io)
{
m_parent = p__parent;
m_root = p__root;
f_fileName = false;
_read();
}
private void _read()
{
_chunkId = System.Text.Encoding.GetEncoding("ASCII").GetString(m_io.ReadBytes(8));
if (!( ((ChunkId == "IFWI!!!!") || (ChunkId == "DROIDBT!") || (ChunkId == "SPLASHS!")) ))
{
throw new ValidationNotAnyOfError(ChunkId, M_Io, "/types/image/seq/0");
}
_lenBody = m_io.ReadU4le();
_flags = m_io.ReadU1();
{
byte M_ = Flags;
if (!((M_ & 1) != 0))
{
throw new ValidationExprError(Flags, M_Io, "/types/image/seq/2");
}
}
_reserved1 = m_io.ReadU1();
_reserved2 = m_io.ReadU1();
_reserved3 = m_io.ReadU1();
_body = m_io.ReadBytes(LenBody);
}
private bool f_fileName;
private string _fileName;
public string FileName
{
get
{
if (f_fileName)
return _fileName;
_fileName = (string) ((ChunkId == "IFWI!!!!" ? "ifwi.bin" : (ChunkId == "DROIDBT!" ? "droidboot.img" : (ChunkId == "SPLASHS!" ? "splashscreen.img" : ""))));
f_fileName = true;
return _fileName;
}
}
private string _chunkId;
private uint _lenBody;
private byte _flags;
private byte _reserved1;
private byte _reserved2;
private byte _reserved3;
private byte[] _body;
private AndroidBootldrAsus m_root;
private AndroidBootldrAsus m_parent;
public string ChunkId { get { return _chunkId; } }
public uint LenBody { get { return _lenBody; } }
public byte Flags { get { return _flags; } }
public byte Reserved1 { get { return _reserved1; } }
public byte Reserved2 { get { return _reserved2; } }
public byte Reserved3 { get { return _reserved3; } }
public byte[] Body { get { return _body; } }
public AndroidBootldrAsus M_Root { get { return m_root; } }
public AndroidBootldrAsus M_Parent { get { return m_parent; } }
}
private byte[] _magic;
private ushort _revision;
private ushort _reserved1;
private uint _reserved2;
private List<Image> _images;
private AndroidBootldrAsus m_root;
private KaitaiStruct m_parent;
public byte[] Magic { get { return _magic; } }
public ushort Revision { get { return _revision; } }
public ushort Reserved1 { get { return _reserved1; } }
public uint Reserved2 { get { return _reserved2; } }
/// <summary>
/// Only three images are included: `ifwi.bin`, `droidboot.img`
/// and `splashscreen.img`
/// </summary>
public List<Image> Images { get { return _images; } }
public AndroidBootldrAsus M_Root { get { return m_root; } }
public KaitaiStruct M_Parent { get { return m_parent; } }
}
}