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 Ruby generated by Kaitai Struct depends on the Ruby runtime library. You have to install it before you can parse data.
The Ruby runtime library can be installed from RubyGems:
gem install kaitai-struct
Parse a local file and get structure in memory:
data = AndroidBootldrAsus.from_file("path/to/local/file.img")
Or parse structure from a string of bytes:
bytes = "\x00\x01\x02..."
data = AndroidBootldrAsus.new(Kaitai::Struct::Stream.new(bytes))
After that, one can get various attributes from the structure by invoking getter methods 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
require 'kaitai/struct/struct'
unless Gem::Version.new(Kaitai::Struct::VERSION) >= Gem::Version.new('0.9')
raise "Incompatible Kaitai Struct Ruby API: 0.9 or later is required, but you have #{Kaitai::Struct::VERSION}"
end
##
# 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>
# @see https://android.googlesource.com/device/asus/fugu/+/android-8.1.0_r5/releasetools.py Source
class AndroidBootldrAsus < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
@magic = @_io.read_bytes(8)
raise Kaitai::Struct::ValidationNotEqualError.new([66, 79, 79, 84, 76, 68, 82, 33].pack('C*'), magic, _io, "/seq/0") if not magic == [66, 79, 79, 84, 76, 68, 82, 33].pack('C*')
@revision = @_io.read_u2le
raise Kaitai::Struct::ValidationLessThanError.new(2, revision, _io, "/seq/1") if not revision >= 2
@reserved1 = @_io.read_u2le
@reserved2 = @_io.read_u4le
@images = []
(3).times { |i|
@images << Image.new(@_io, self, @_root)
}
self
end
class Image < Kaitai::Struct::Struct
def initialize(_io, _parent = nil, _root = self)
super(_io, _parent, _root)
_read
end
def _read
@chunk_id = (@_io.read_bytes(8)).force_encoding("ASCII")
raise Kaitai::Struct::ValidationNotAnyOfError.new(chunk_id, _io, "/types/image/seq/0") if not ((chunk_id == "IFWI!!!!") || (chunk_id == "DROIDBT!") || (chunk_id == "SPLASHS!"))
@len_body = @_io.read_u4le
@flags = @_io.read_u1
_ = flags
raise Kaitai::Struct::ValidationExprError.new(flags, _io, "/types/image/seq/2") if not (_ & 1) != 0
@reserved1 = @_io.read_u1
@reserved2 = @_io.read_u1
@reserved3 = @_io.read_u1
@body = @_io.read_bytes(len_body)
self
end
def file_name
return @file_name unless @file_name.nil?
@file_name = (chunk_id == "IFWI!!!!" ? "ifwi.bin" : (chunk_id == "DROIDBT!" ? "droidboot.img" : (chunk_id == "SPLASHS!" ? "splashscreen.img" : "")))
@file_name
end
attr_reader :chunk_id
attr_reader :len_body
attr_reader :flags
attr_reader :reserved1
attr_reader :reserved2
attr_reader :reserved3
attr_reader :body
end
attr_reader :magic
attr_reader :revision
attr_reader :reserved1
attr_reader :reserved2
##
# Only three images are included: `ifwi.bin`, `droidboot.img`
# and `splashscreen.img`
attr_reader :images
end