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Questions tagged [magic-numbers]

Magic numbers are unexplained values that often should be replaced with a named constant.

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Check whether an user given number is a magic number or not

To me: Magic Number: If sum of digits of a number becomes 1 until length of resultant becomes 1 is called magic number. example: 1 [ sum: 1], 10 [sum: 1 + 0 = 1], 91 [sum: pass1: 9 + 1 = 10, pass2: 1 + 0 = 1], 100 [sum: 1 + 0 + 0 = 1] like…
Kunal Das
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What to do with XML node names (hard coded values)?

I've been working with xml lately. And have noticed a bit of a phenomenon (maybe not that big of a deal to the rest of the world, but to me it was). Perhaps, it is me being a newb. But shouldn't most hard coded or magic numbers be broken out to a…
kevindaub
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chrome extension - getting file type based on magic number

I need to write a chrome extension, that gets the downloaded file type. This is the existing code that gets it by the extension file. chrome.downloads.onDeterminingFilename.addListener(function(item, __suggest) { function suggest(filename,…
Zag Gol
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A magic number overkill

I have a piece of code in which I call a function with argument of a string value. The string value is taken from a string array using the index. if (validateRejectionCategory(rejectionData[0])) { ...... } In this case is 0 still considered a…
Belphegor21
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How to differentiate .odt and .docx file apart from magic number and extension

I need to detect the document type of the given file. I did it using magic numbers for pdf,RTF, doc files. but whenever I tried to do the same on odt and docx files, unfortunately, I can't because the magic number for both are same. Please help me…
venkatesh karthick
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Possible to used a named variable as multiple arguments?

I have some simple code: context.drawImage(image, 0, 0); I was wondering if it would be possible, using something like ES6 spread (edit: spread syntax, not 'spread operator') features, to eliminate the magic numbers and make the code more…
mikemaccana
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Searching for a safe magic number for in-memory data structure

I'm implementing a heap allocator (malloc), and I need to choose a magic number to check if a given pointer point to a data structure I allocated. It seems obvious to me that no magic number can be considered completely safe (if the number is…
fokenrute
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Bad magic number when deploying on Heroku

I am trying to deploy a Django app to Heroku which uses a client to connect to the api of an invoice service. Everything works when running localy, but when deploying on Heroku I get a Bad magic number errror: error at /bexiopy/auth/ Bad magic…
syl-lo
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Is it worth while creating a custom annotation to show that a method is simply helping readability?

Currently working with Spring and I've been learning about methods I can use to help the readability of my code, with one example being replace complicated conditionals with an easy to understand method call. For example: private void myMethod(){ …
looksgoodhoss
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Check if valid executable or shell file by checking magic number in C

The magic numbers that you will recognize are shown in the following table. Name of file type Magic number (bytes) at start of file: -Executable ASCII characters DEL, ‘E’, ‘L’ and ‘F’ -Shell script ASCII characters ‘#’ and ‘!’ Standard file…
user8477178
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Weird SSE assembler instructions for double negation

GCC and Clang compilers seem to employ some dark magic. The C code just negates the value of a double, but the assembler instructions involve bit-wise XOR and the instruction pointer. Can somebody explain what is happening and why is it an optimal…
RuRo
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Special IP addresses

In particular I'm looking for an IP address that I can put in my hosts file that will black-hole a given DNS name. Right now I'm using 127.0.0.1 but that would start acting odd if I installed any services. How can I prevent a 3rd party program from…
BCS
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Get the file size from a WebP file header

https://developers.google.com/speed/webp/docs/riff_container I’ve got a WebP file (about 22 kilobytes), and the hexadecimal of the first 12 bytes is 524946461c57000057454250. The first and last 4 bytes make sense (ASCII "RIFF" and "WEBP"), but I…
Eric Cochran
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Minifilter - Reading file header

I'm using minifilter scanner program. The flow of the process is as follow: 1. The program reads the file content with FltReadFile function and stores into Buffer. 2. The program sends the Buffer to user mode. 3. The user mode checks for file…
user3449011
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Interleaving bzip2 and non-bzip2 data

I am looking at making a file format that interleaves two types of chunks of raw bytes. One chunk will contain a block of bzip2-compressed data, which has a header containing the usual bzip2 magic number (BZh9). The second chunk will consist of…
Alex Reynolds
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