How to get hex string from signed integer

Say I have the classic 4-byte signed integer, and I want something like print hex(-1) to give me something like 0xffffffff In reality, the above gives me -0x1. I'm dawdling about in some lower...

C - Serialization of the floating point numbers (floats, doubles)

How to convert a floating point number into a sequence of bytes so that it can be persisted in a file? Such algorithm must be fast and highly portable. It must allow also the opposite operation,...

How windows notepad interpret characters

I was wondering how windows interpret characters, for instance: I maked a file with an Hexeditor with the 3 bytes E3 81 81. Those bytes are the "ぁ" character encoded as UTF-8. I open the notepad...

Exception 'open failed: EACCES (Permission denied)' on Android

I am getting open failed: EACCES (Permission denied) on the line OutputStream myOutput = new FileOutputStream(outFileName); I checked the root, and I tried...

How to write bytes to file?

I have a function that returns a string. The string contains carriage returns and newlines (0x0D, 0x0A). However when I write to a file it contains only the new line feeds. Is there a way to get...

How are integers internally represented at a bit level in Java?

I am trying to understand how Java stores integer internally. I know all java primitive integers are signed, (except short?). That means one less bit available in a byte for the number. My...

IOError: [Errno 24] Too many open files:

I have a huge file that I am writing into approximately 450 files. I am getting error as too many files open. I searched the web and found some solution but it is not helping. import...

How to convert outputStream to a byte array?

How can I convert an OutputStream to a byte array? I have found that first I need to convert this OutputStream to a ByteArrayOutputStream. There is only write() method in this OutputStream class...

Wrap alloca function in C

Is it possible to wrap the C function alloca into "another"? (only macros of course) Something like: #define my_alloca(size) \ ({ \ void *ret = alloca(size); \ my_function(ret); \ ret;}) I'm not...

Can a call to Assembly.Load(byte[]) raise the AppDomain.AssemblyResolve event?

Suppose I have a handler for AppDomain.AssemblyResolve event, and in the handler I construct a byte array and invoke the method Assembly.Load(byte[]). Can this method itself cause the...

ERROR: C:\snort\etc\snort.conf(546) => Invalid argument: include Fatal Error, Quitting

I am trying to configure snort on windows 7. I get this error whenever I run the following command. command: C:\Snort\bin>snort -A console -i1 -c C:\snort\etc\snort.conf -l C:\snort\log -K...

What is the best practice of docker + ufw under Ubuntu

I just tried out Docker. It is awesome but seems not work nicely with ufw. By default, docker will manipulate the iptables a little bit. The outcome is not a bug but not what I expected. For more...

Getting byte array through input type = file

var profileImage = fileInputInByteArray; $.ajax({ url: 'abc.com/', type: 'POST', dataType: 'json', data: { // Other data ProfileImage: profileimage // Other data }, ...

Apache Kafka Avro Deserialization: Unable to deserialize or decode Specific type message.

I am trying to use Avro Serialize with Apache kafka for serialize/deserialize messages. I am create one producer, which is used to serialize specific type message and send it to the queue. When...

Array.Clear() vs Buffer.BlockCopy()

Background I have to clear fixed-length managed byte arrays (ex: byte[4096]) very frequently. My question is seeking an answer that applies to generic-usage, but for those who are wondering...

WebClient UploadData gives 400 Bad Request error while posting json data with extended ascii characters

I am trying to sync contact with mailchimp. When i have extended ascii characters such as (Johéctíóú Diamond) in contact details it gives below error. The remote server returned an error:...

Is there a better way to "Pretty Print" the json string than I'm using

I have json data comes server side. In case I use the next code I get not pretty printed one line string: print(String(bytes: jsonData, encoding: String.Encoding.utf8)) To make it pretty printed...

How to use Chrome Profile in Selenium Webdriver Python 3

So whenever I try to use my Chrome settings (the settings I use in the default browser) by adding options = webdriver.ChromeOptions() options.add_argument("user-data-dir=C:\Users\... (my webdriver...

Static and dynamic linking w.r.t. portability, in the context of Go

Let me start by getting some facts on the table to have them fact-checked, so that there's no confusion: An ELF binary with a dynamic section will be compiled with some symbols unresolved. The...

How to get byte array from a file in reactJS

I've got a form for uploading Avatar image and I have to send the image file in the format of binary string; so far I've tried ReadAsBinaryString from FileReader but it's not working:( here's my...

ClientAbortException with Spring Boot on downloading large files

Sometimes when downloading a large file (~1GB) from my Spring Boot application a ClientAbortException occurs. I am using "org.springframework.boot:spring-boot-starter-web:2.3.4.RELEASE" from maven...

How can I determine the end of a SQLite db file from a hex view of the hard disk?

I have a HDD that may have deleted SQLite db files on it. I am reading the bytes of the disk and looking for the hex signature of SQLite files: 53514c69746520666f726d6174203300 My code tells me...

How to mask a password when password is sent as an argument in BashOperator

I am using BashOperator to run a bash command that requires multiple parameters to work. Among those parameters I am sending a password. bash_task = BashOperator( ...

SPIFFS Upload Failed Error Code -10010 While uploading files to ESP8266

I have an ESP8266, WEMOS D1 Mini to be exact , im using a Arduino IDE and the plugin to upload a data to the ESP8266 heres the error messages : [SPIFFS] data : C:\WASP-master\data [SPIFFS] size...

How to create and parse Tag, Length, Value (TLV) in PHP and encode it in Base64

There is a new regulation from the Government asking all VAT registered companies to implement QR CODE in the new E-Invoice. The QR code fields shall be encoded in Tag-Length-Value (TLV) format...

flutter: phone Authentication failed -ERROR: Invalid token.. Try again later

Firebase Phone Auth is working in simulator and not working in real device. already i created an apn key in developer.apple.com and add that in firebase and enabled background mode and check...

Blazor .Net 6.0 Hot Reload

I have an asp.net hosted blazor wasm app that I just upgraded from 5.0 to 6.0. When trying hot reload either from VS 2022 or from dotnet watch run I get the following error in the browser...

Read/Write Bytes to and From a File Using Only Java.IO

How can we write a byte array to a file (and read it back from that file) in Java? Yes, we all know there are already lots of questions like that, but they get very messy and subjective due to the...

Why don't modern compilers coalesce neighboring memory accesses?

Consider the following code: bool AllZeroes(const char buf[4]) { return buf[0] == 0 && buf[1] == 0 && buf[2] == 0 && buf[3] == 0; } Output assembly from Clang...

memcpy() is faster than "direct" memory access?

I need to compute the MD5 hash of a large (e.g. several GB) block of memory. Data is already loaded in memory. And physical RAM is bigger than data, so nothing is swapped out (presumably)....