This page hosts a formal specification of Android nanoapp header using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for JavaScript generated by Kaitai Struct depends on the JavaScript runtime library. You have to install it before you can parse data.
The JavaScript runtime library is available at npm:
npm install kaitai-structSee the usage examples in the JavaScript notes.
Parse structure from an ArrayBuffer:
var arrayBuffer = ...;
var data = new AndroidNanoappHeader(new KaitaiStream(arrayBuffer));
After that, one can get various attributes from the structure by accessing fields or properties like:
data.headerVersion // => get header version
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
define(['kaitai-struct/KaitaiStream'], factory);
} else if (typeof module === 'object' && module.exports) {
module.exports = factory(require('kaitai-struct/KaitaiStream'));
} else {
root.AndroidNanoappHeader = factory(root.KaitaiStream);
}
}(typeof self !== 'undefined' ? self : this, function (KaitaiStream) {
/**
* @see {@link https://android.googlesource.com/platform/system/chre/+/a7ff61b9/build/build_template.mk#130|Source}
*/
var AndroidNanoappHeader = (function() {
function AndroidNanoappHeader(_io, _parent, _root) {
this._io = _io;
this._parent = _parent;
this._root = _root || this;
this._read();
}
AndroidNanoappHeader.prototype._read = function() {
this.headerVersion = this._io.readU4le();
if (!(this.headerVersion == 1)) {
throw new KaitaiStream.ValidationNotEqualError(1, this.headerVersion, this._io, "/seq/0");
}
this.magic = this._io.readBytes(4);
if (!((KaitaiStream.byteArrayCompare(this.magic, [78, 65, 78, 79]) == 0))) {
throw new KaitaiStream.ValidationNotEqualError([78, 65, 78, 79], this.magic, this._io, "/seq/1");
}
this.appId = this._io.readU8le();
this.appVersion = this._io.readU4le();
this.flags = this._io.readU4le();
this.hubType = this._io.readU8le();
this.chreApiMajorVersion = this._io.readU1();
this.chreApiMinorVersion = this._io.readU1();
this.reserved = this._io.readBytes(6);
if (!((KaitaiStream.byteArrayCompare(this.reserved, [0, 0, 0, 0, 0, 0]) == 0))) {
throw new KaitaiStream.ValidationNotEqualError([0, 0, 0, 0, 0, 0], this.reserved, this._io, "/seq/8");
}
}
Object.defineProperty(AndroidNanoappHeader.prototype, 'isSigned', {
get: function() {
if (this._m_isSigned !== undefined)
return this._m_isSigned;
this._m_isSigned = (this.flags & 1) != 0;
return this._m_isSigned;
}
});
Object.defineProperty(AndroidNanoappHeader.prototype, 'isEncrypted', {
get: function() {
if (this._m_isEncrypted !== undefined)
return this._m_isEncrypted;
this._m_isEncrypted = (this.flags & 2) != 0;
return this._m_isEncrypted;
}
});
Object.defineProperty(AndroidNanoappHeader.prototype, 'isTcmCapable', {
get: function() {
if (this._m_isTcmCapable !== undefined)
return this._m_isTcmCapable;
this._m_isTcmCapable = (this.flags & 4) != 0;
return this._m_isTcmCapable;
}
});
return AndroidNanoappHeader;
})();
return AndroidNanoappHeader;
}));