Shawn Feng shawnfeng0

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Keep thinking

shawnfeng0 / openssl_crypt.cc

Last active April 15, 2021 09:03

Use openssl crypt

	#include <openssl/evp.h>
	#include <stdlib.h>
	#include <string.h>

	#include <string>
	#include <vector>

	// From https://www.openssl.org/docs/man1.1.1/man3/EVP_EncryptInit.html
	static bool CryptAes256Cfb(const std::vector<uint8_t> &key,
	const std::vector<uint8_t> &iv,

shawnfeng0 / dd_read_write_test.sh

Last active April 7, 2021 09:14

dd read and write test

sync && dd if=/dev/zero of=/var/avi/mmc0/tmp.bin bs=1M count=100 && sync && dd if=/var/avi/mmc0/tmp.bin of=/dev/null bs=1M

shawnfeng0 / change_git_commit_message.sh

Last active August 4, 2021 13:44

change git commit message

	#!/bin/sh

	if [ $# -lt 3 ] ; then
	echo "Usage: $0 old_email new_email new_name"
	echo "Example: $0 [email protected] [email protected] new_name"
	exit 1;
	fi

	echo "old_email: $1"
	echo "new_email: $2"

shawnfeng0 / create_gitkeep_to_empty_directory.sh

Created April 13, 2021 07:32

Create .gitkeep file to empty directory

find -type d -empty | xargs -t -L1 -I _ touch _/.gitkeep

shawnfeng0 / mutex_queue.h

Last active March 22, 2022 04:09

simple queue with mutex

	//
	// Created by shawnfeng on 2021-08-12.
	// https://gist.github.com/ShawnFeng0/429b6caef85ec0d32f34081374dcdb8a
	//

	#pragma once

	#include <atomic>
	#include <condition_variable>
	#include <mutex>

shawnfeng0 / line_print_refresh.h

Created October 29, 2021 08:27

For the method of refreshing the terminal output line, refer to: https://github.com/ninja-build/ninja/blob/0cd88287a4cd77d11c92c7a9b44bb15fb787a1ee/src/line_printer.cc#L66

	#include <iostream>

	#define REFRESH_OUTPUT_LINE(token) \
	std::cout << "\r"; \
	std::cout << #token << " => " << (token); \
	std::cout << "\x1b[K"; \
	std::cout.flush();

shawnfeng0 / enum_with_string.h

Last active November 15, 2021 09:40

Define an enum that can be converted to a string

	//
	// Created by shawnfeng([email protected]) on 2021/11/1.
	//
	#pragma once

	#include <map>
	#include <string>
	#include <vector>

	// reference:

shawnfeng0 / busybox_httpd_indexcgi.c

Last active July 1, 2022 09:05

Modified the file index graphical interface to be similar to the nginx interface, Original reference: networking/httpd_indexcgi.c

	/*
	* Copyright (c) 2007 Denys Vlasenko <[email protected]>
	*
	* Licensed under GPLv2, see file LICENSE in this source tree.
	*/

	/*
	* This program is a CGI application. It outputs directory index page.
	* Put it into cgi-bin/index.cgi and chmod 0755.
	*/

shawnfeng0 / delay_truth.h

Last active August 3, 2022 13:17

DelayTruth: Delay setting true variable. TimeoutTruth: Set true to false after timeout

shawnfeng0 / jsoncpp_usage_test.cpp

Created April 18, 2023 08:39

jsoncpp usage


	int main(void) {
	std::string raw = "{\"test\": 1}";

	Json::Value root;// starts as "null"; will contain the root value after parsing
	Json::Reader reader;
	reader.parse(raw, root, false);
	int test_a = root["test"].asInt();

	DEBUG_TOKEN(test_a);