iharkatkavets

Convention: Byte array notation as it would appear in a hexeditor.

= Layout=

KDBX files, the keepass database files, are layout as follows:

1) Bytes 0-3: Primary identifier, common across all kdbx versions: 
  private static $sigByte1=[0x03,0xD9,0xA2,0x9A];

2) Bytes 4-7: Secondary identifier. Byte 4 can be used to identify the file version (0x67 is latest, 0x66 is the KeePass 2 pre-release format and 0x55 is KeePass 1)

iharkatkavets

• Original article
• Wayback machine

---

Keepass file format explained

I’m currently working (I’m just at the beginning, and I’m quite slow) on a personal project that will use Keepass files (kdb and kdbx).
I tried to find some documentation about .kdb and .kdbx format, but I didn’t find anything, even in the Keepass official website. I you want to know how these file formats are structured, you must read Keepass’s source code. So I wrote this article that explains how Keepass file format are structured, maybe it will help someone.

iharkatkavets

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <strings.h>


char* readline() {
	size_t alloc_length = 1024;
	size_t data_length = 0;

iharkatkavets

All the next steps are performed on RaspberryPi machine in console

1. Download the latest version of neovim from official repository. At the moment of writing the manual the latest version is 0.9.2

cd ~ && mkdir neovim-install && cd !$

wget 'https://github.com/neovim/neovim/archive/refs/tags/v0.9.2.tar.gz'

2. Extract the downloaded archive and navigate inside

iharkatkavets

All next stepts are performed in Raspberry Pi environment

1. Create a temporary directory

cd ~ && mkdir swift5.9 && cd !$

2. Download the latest Swift version for ARM architecture(aarch64). On the moment of preparing the manual the latest version is 5.9

wget https://download.swift.org/swift-5.9-branch/ubuntu2004-aarch64/swift-5.9-DEVELOPMENT-SNAPSHOT-2023-09-21-a/swift-5.9-DEVELOPMENT-SNAPSHOT-2023-09-21-a-ubuntu20.04-aarch64.tar.gz

3. Extract the acrhive

iharkatkavets

import Foundation

// TASK
// Complete function `process(...)`

func processData(_ v: Int) async throws -> Int {
    print("<-start \"\(v)\"...")
    let s: Int = 5  // .random(in: 0...10)
    try await Task.sleep(for: .seconds(s))
    print("->finish \"\(v)\" (took \(s) sec).")

iharkatkavets

use std::{collections::HashMap, env, fs, io};
use unicode_general_category::GeneralCategory;
use unicode_general_category::get_general_category;

fn main() {
    if env::args().len() != 2 {
        println!("Use {} <FILE_PATH>", env::args().nth(0).unwrap());
        return;
    }

iharkatkavets

import Foundation
import Synchronization

// The problem repeats the LC problem '1114. Print in Order'
// https://leetcode.com/problems/print-in-order

// Implement your solution inside the `Foo` class.
// Test with: swift main.swift
final class Foo: Sendable {
    init() {

iharkatkavets

// Inspired from Medium post
// Decrypt Go: Why Is Go’s Regexp So Slow, and Why That’s Actually Smart
//
// https://pub.huizhou92.com/decrypt-go-why-is-gos-regexp-so-slow-and-why-that-s-actually-smart-32fedad4bd9c
//
// to run:
// swift package init --type executable --name ReDoS
// cp curr_gist Sources/ReDoS/ReDoS.swift
// swift run -c release -q ReDoS

iharkatkavets

//
// The problem repeats the LC problem '1115. Print FooBar Alternately'
// https://leetcode.com/problems/print-in-order

// Implement your solution inside the `FooBar` class.
// Test with: swift main.swift

final class FooBar: Sendable {
    let n: Int