The name given to the process of encoding data such that it uses lesser number of bits as compared to the original representation.

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Cuda C Matrix Compression

I am using Cuda to learn and implement a CSR matrix compression algorithm. What can I do better relating to C's best practices? main.c: ...
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1answer
74 views

Speeding up process time while archiving files

I asked this question on Stackoverflow, and was told I might have better luck here. I'm new to c# and have created a basic file archiver. It works, and it does what it's suppose to do, but I think ...
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2answers
201 views

Python 3 decompression routine 10x slower than C# equivalent

I'm relatively new to Python 3, especially IO programming, writing a Blender add-on to import model data. The model data is available in a custom compression, and I originally wrote code in C# to ...
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1answer
32 views

Condense JSON for bandwidth efficiency

JSON is quickly becoming the formatting standard of choice for quick, convenient, and reliable machine to machine communications. It is flexible and widely supported but it has some drawbacks when it ...
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2answers
157 views

RAM overhead on a compression program [closed]

In a program, the one below is attempting to codify into a translation of another file. The output is severely condensed. It works, and once I get it to decompress, then it will win award after award. ...
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1answer
132 views

Huffman algorithm implementation in C++

Lately, I have been working on this Huffman algorithm and it is finally done, though I think it is improvable due to the fact that people say you have got to use two priority queues but I ended up ...
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1answer
53 views

Compressing a file using zip or gzip

Write a Compress class defines two static methods, gzipFile(), which compresses a file using GZIP compression format, and zipDirectory(), which compresses the files (but not directories) in a ...
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1answer
183 views

Simplifying LZW compression & decompression

I have wrote code that takes an input file text that can be compressed, and should contain ascii values, and then a new file is created with an appended ".lzw" and that file can then be decompressed. ...
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1answer
54 views

Custom compression tool

I have made my own compression tool for a stack-based language that uses a dictionary compression method. The code for the decompression is the following: ...
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0answers
23 views

Adding information to a compressed file and compressing the output

I wrote this script for adding information to a compressed file and compressing the output: ...
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1answer
55 views

Uncompress archive, check contents, add missing files, recompress archive

The code looks for the specified .tgz file, if it's not present, it creates it. It looks for files ending in .txt in the cwd and adds them to a list. It decompresses the gzip, checks for the .txt ...
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1answer
63 views

SICP - exercise 2.69 - generate a huffman tree from a set of ordered leaves

From SICP Exercise 2.69: The following procedure takes as its argument a list of symbol-frequency pairs (where no symbol appears in more than one pair) and generates a Huffman encoding tree ...
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1answer
50 views

RLE-like string compression in clojure

There have been already many similar questions to this one (e.g. this and this, just to point two), but I did not find any for clojure. The goal is to compress a string in a RLE-like way: i.e. each ...
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2answers
197 views

Extracting RAR files in a directory

I just started programming, and something is telling me that this working function looks to big for what it does. Can you give a better version of the code so I can understand how to code faster, ...
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1answer
92 views

String compression implementation in C

I implemented basic string compression algorithm that uses the counts of repeated characters. For example: the string aabcccccaaa would become a2b1c5a3. What do you think about this, is there a better ...
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2answers
55 views

Simple compression on steroids - now with decompression

A third follow up to the simple compression implementation. Adopted most of @holroy's suggestions. Main changes: Compression now uses high-bit to indicate that additional length bytes are still ...
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2answers
212 views

Simple compression reloaded++

As a follow up to my previous question I've improved the code + algorithm. The compression now works the following way: Each character is followed by a length byte. The top 3 bits of that byte denote ...
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2answers
56 views

Simple string compression reloaded

Inspired by this question I thought I provide my implementation. I tried to go with the spirit of the *nix tool chain - read from stdin and write to stdout. This has the added benefit of making ...
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4answers
620 views

Algorithm for simple string compression

I attempted a problem from the Cracking the Coding Interview book. The following input: aabcccaaa should give the following output: ...
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1answer
319 views

C++11 implementation of Huffman-encoding

This is a c++11 implementation of Huffman-encoding that I wrote as a hobby. My main goal in writing it was to get more accustomed to c++11 and STL in general, as well as stuff like bit-manipulation. ...
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0answers
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Jacob's Ladder compression [closed]

I'm currently interested in a logical decay algorithm which will need me to have the correct coordination of 3 bytes. I have 2 of them, initially. After that, I have to get 2 from the one, but in that ...
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1answer
36 views
4
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2answers
163 views

lz77 is quick on strings but not on bytes

I ported a lz77 implementation from java to c#, and it's working fine. Now I want it to compress bytes and not strings, as I need it for another project. This is the porting, operating on string: ...
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1answer
75 views

Run-length encoding in Haskell

I wrote a short Haskell script to compress and decompress via the use of run length encoding. The concept is simple enough, n equal items ...
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1answer
102 views
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3answers
762 views

String compression by using repeated characters count

My task was to perform a basic string compression by replacing consecutive repeated characters by one instance of the character and integer denoting the number of repetitions. For example the string ...
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1answer
509 views

Convert zip to gzip and upload to S3 bucket

My code accesses an FTP server, downloads a .zip file, pushes the file contents as .gz to an AWS S3 bucket. ...
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2answers
136 views

Brotli compression algorithm, translated from Python into Haskell

I have converted some code in Python into its Haskell equivalent. Python implementation: ...
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1answer
77 views

Interop compression

This is a function definition from an external dll, that I'm calling from my code: ...
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2answers
123 views

Reverse engineering Darkstone game archives

Reverse engineering old games is something I do every now and then. This time, I took a shot at this old RPG called Darkstone. The bulk of the game's data is stored in archive files with the ...
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2answers
135 views

LZW encoder and decoder

Recently, I reviewed this question about an LZW decoder. In order to properly review that question, I needed to write my own encoder and decoder to be able to test their program. Someone thought it ...
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LZW decompressor in C (II)

Here is an update to my previous thread which you can find here. Again, I'd very much appreciate any advice or comments about the structure/logic of the program, style of the code, or reusability of ...
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1answer
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LZW decompressor in C

Here is a simple decompressor in C. I'd very much appreciate any advice or comments about the structure/logic of the program, style of the code, or reusability of the features. I'm a real novice and ...
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1answer
26 views

Bash Compress Managed Directory Ignoring .git, bower_components, node_modules, etc

Fairly easy way to compress a wordpress plugin (or similar) as a zip file without including all the dependencies used to create and manage the development, but which don't belong in the final product. ...
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1answer
66 views

Teamwork challenge for Timus Online Judge

Question is here: Input The first line contains an integer \$N\$, which is the quantity of numbers written down by Vasya (\$1 \le N \le 1000\$). The second line contains these numbers ...
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2answers
129 views

Transforming an array in Ruby

I watched a presentation by Dave Thomas on Elixir where he gave an example problem that he solved using functional programming. He mentioned using Ruby to solve the same problem, but did not show an ...
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1answer
4k views

Simple LZW compression algorithm

It's a simple version of LZW compression algorithm with 12 bit codes. I want to know what's good and what's bad about this code. Be as picky as you like. ...
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1answer
193 views

Huffman code generator in Haskell

This is problem 50 in https://wiki.haskell.org/99_questions/46_to_50. The website has more elegant Haskell solutions, but I wanted to get feedback on how the code I wrote on my own below could be ...
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1answer
72 views

Program for compacting other given code

I've just finished a small function that will reduce the size of code as much as possible without breaking anything. Obviously it makes everything a bit unreadable so it's not really for cleaning the ...
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1answer
51 views

Copying messages with compression

I have the following Main class: ...
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2answers
103 views

Using reduce twice in a row for Run Length Encoding

First of all, I'm new to Lisp (I currently use CLISP and SBCL). There probably are huge mistakes in this code so any guidelines are welcome :) I'm very confused about how to do this. It's just about ...
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1answer
690 views

HTML Compressor with regex

I would like to compress a Magento HTML page using some regex, and this is what I have written: ...
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2answers
339 views

Process zip files

I have zip bundle, for example, abcd.zip, contains more zips like 1.zip, 2.zip etc. Inside of each child zip there is a .jpg file like 1.jpg, 2.jpg etc. There are so many other files but I need only ...
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3answers
400 views

Compress an ASCII string

Given an ASCII string create a 'compressed' version of it. For example, aabccccddddddde would output a2bc4d7e whereas abc would output abc. This is how I've implemented it. Is there a smarter way ...
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1answer
358 views

Compressing a stream asynchronously, and returning a byte[]

Assuming I have to leave the contract intact (take byte[] and return byte[]), what's the correct way to structure this ...
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1answer
98 views

Converting Ocean to RunLengthEncoding object

For the problem statement shown below: Part II(b): Your run-length encodings will only be useful if other classes have the ability to read them after you create them. Therefore, implement the ...
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1answer
640 views

Counting the lines of a compressed file

This is a Python script for counting the lines of a compressed file: ...
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2answers
241 views

Backing up an entire website with PHP

I'm attempting to backup lots of website using this php code. The script basically goes through the whole public_html directory and adds all the folders and files recursively and zips them. Here's ...
3
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2answers
859 views

String compression using repeated character counts

Implement a method to perform basic string compression using the counts of repeated characters. For example, the string aabcccccaaa would become ...
8
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1answer
164 views

Saving bytes instead of objects to write smaller files

This question is about reducing the size of files saved to disk in an infinite world 2D mining game. I finally added code to my game to save and load distant chunks instead of keeping all of them ...