momvart’s gists

momvart / instruction.md

Last active February 7, 2025 00:04

Attaching native debugger to a system service in AOSP

Build AOSP in debug mode (maybe optional)

$ export TARGET_BUILD_TYPE=debug
$ export HOST_BUILD_TYPE=debug

Use eng product type, e.g.
```
$ lunch aosp_oriole-eng
```
After building and booting, run adb as root (maybe optional)

momvart / buggy_vec.rs

Last active September 14, 2023 18:31

An example of how unsafe Rust can cause memory deallocation bugs. A case of late `len` update and unsoundness.

	#![feature(maybe_uninit_uninit_array)]
	#![feature(extend_one)]

	use std::mem::MaybeUninit;

	fn main() {
	let mut v = MyVec::new();
	v.push(Box::new(DropReporter));

	let mut dest = BadExtend(Default::default());

momvart / visit.rs

Last active January 5, 2023 04:19

Inspired by the default generic rustc visitors, here are a set of visitors written for StatementKind, TerminatorKind, and Rvalue

	use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece, Mutability};
	use rustc_middle::{
	mir::{
	AggregateKind, AssertMessage, BasicBlock, BinOp, BorrowKind, CastKind, Coverage,
	FakeReadCause, InlineAsmOperand, Local, NonDivergingIntrinsic, NullOp, Operand, Place,
	RetagKind, Rvalue, StatementKind, SwitchTargets, TerminatorKind, UnOp, UserTypeProjection,
	},
	ty::{Const, Region, Ty, Variance},
	};
	use rustc_span::Span;

momvart / ISO8601Parser.cs

Last active April 10, 2022 16:39

A set of functions to parse some data and time data expressed in ISO 8601 format for C#.

	using System;
	using System.Text.RegularExpressions;

	namespace RBC.WorkflowEngine.Core.Utilities;

	/// <summary>
	/// Provides a set of functions for parsing some of date- and time-related
	/// data represented in ISO 8601 formats.
	/// </summary>
	/// <see href="https://en.wikipedia.org/wiki/ISO_8601">

momvart / KotlinObjectExtensions.cs

Created November 24, 2021 16:04

A set of extensions functions written on object, by default available in Kotlin, ported for c#.

	using System;
	using System.Runtime.CompilerServices;
	using System.Threading.Tasks;

	namespace Utilities
	{
	public static class KotlinObjectExtensions
	{
	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public static T Also<T>(this T callee, Action<T> action)

momvart / ThousandSeparatorVisualTransformation.kt

Last active October 29, 2024 08:15

A VisualTransformation for inserting thousand-separator commas in TextFields inputting numbers. It also has support for fraction parts and can put limit on the number of fraction digits. #android #compose

	import androidx.compose.ui.text.AnnotatedString
	import androidx.compose.ui.text.input.OffsetMapping
	import androidx.compose.ui.text.input.TransformedText
	import androidx.compose.ui.text.input.VisualTransformation
	import java.text.DecimalFormat
	import kotlin.math.min

	class ThousandSeparatorVisualTransformation(
	var maxFractionDigits: Int = Int.MAX_VALUE,
	var minFractionDigits: Int = 0

momvart / ObjectToInferredTypesConverter.cs

Last active February 27, 2021 20:35

A converter for `System.Text.Json` that recursively parse converts json to the inferred types. Uses `ExpandoObject` for objects.

	using System.Text.Json;
	using System.Text.Json.Serialization;
	using System.Dynamic;

	public class ObjectToInferredTypesConverter : JsonConverter<object>
	{
	public override object Read(
	ref Utf8JsonReader reader,
	Type typeToConvert,
	JsonSerializerOptions options) =>

momvart / GMM.py

Created January 20, 2021 18:37

Implementation of Gaussian Mixture Models clustering using numpy and scipy.

	import numpy as np
	from numpy.random import choice
	from numpy.linalg import norm
	from scipy.stats import multivariate_normal

	def train_gmm(data, k, convergence_threshold):
	raw_data = data
	data = pd.DataFrame(data) # Should be removed
	feature_columns = data.columns
	pis = np.ones((k, 1)) * 1 / k

momvart / GoogleAuthenticatorUtils.kt

Created August 19, 2020 10:29

A helper class which can generate a URI for google authenticator.

	import android.net.Uri

	object GoogleAuthenticatorUtils {
	enum class KeyType(val uriKey: String) {
	TIME_BASED("totp"),
	COUNTER_BASED("hotp")
	}

	//Based on https://github.com/google/google-authenticator/wiki/Key-Uri-Format

momvart / MarginItemDecoration.kt

Last active August 19, 2020 10:37

An item decoration for recyclerview which adds margin between items.

	import android.content.Context
	import android.graphics.Rect
	import android.util.LayoutDirection
	import android.view.View
	import androidx.annotation.DimenRes
	import androidx.recyclerview.widget.GridLayoutManager
	import androidx.recyclerview.widget.RecyclerView

	class MarginItemDecoration(
	private val marginLeft: Int,

Mohammad Omidvar momvart