tinf
nflate
| tinf | nflate | |
|---|---|---|
| 3 | 1 | |
| 142 | 2 | |
| - | - | |
| 10.0 | 0.0 | |
| over 1 year ago | over 3 years ago | |
| C | C | |
| zlib License | Apache License 2.0 |
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tinf
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Hello, PNG
CRC is a table and 5 lines of code. That's trivial.
>zlib is 23k lines
It's not needed to make a PNG reader/writer. zlib is massive overkill for only making a PNG reader or writer. Here's a tiny deflate/inflate code [2] under 1k lines (and could be much smaller if needed).
stb[0] has single headers of ~7k lines total including all of the formats PNG, JPG, BMP,. PSD, GIF, HDR, and PIC. Here's [1] a 3k lines single file PNG version with tons if #ifdefs for all sorts of platforms. Removing those and I'd not be surprised if you could not do it in ~1k lines (which I'd consider quite simple compared to most of todays' media formats).
>Of course they're not common formats so you're stuck with complex formats like PNG
BMP is super common and easy to use anywhere.
I use flat image files all the time for quick and dirty stuff. They quickly saturate disk speeds and networking speeds (say recording a few decent speed cameras), and I've found PNG compression to alleviate those saturate CPU speeds (some libs are super slow, some are vastly faster). I've many times made custom compression formats to balance these for high performance tools when neither things like BMPs or things like PNG would suffice.
[0] https://github.com/nothings/stb
[1] https://github.com/richgel999/fpng/blob/main/src/fpng.cpp
[2] https://github.com/jibsen/tinf/tree/master/src
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EzGz - An easy to use single header no dependency library for decompression of .gz archives written in modern C++ (probably faster than zlib)
Right now I'm using a C library (https://github.com/jibsen/tinf) due to size constraints. Adding a few hundred kB is prohibitive in that space.
nflate
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Decompressing a Gzip File by Hand
Programming a gzip (deflate) decompressor is a really good learning project. I did it last year, ultimately producing a pretty poor but working implementation [0]. I ended up modifying Mark Adler's puff example program to see the intermediary tables it produces to help debug my own implementation. I wish I had known about infgen (also by Adler). The other resource I would recommend, beyond the official specs is this article by Joshua Davies[1], also mentioned in the original post here.
[0]: https://github.com/davecom/nflate
What are some alternatives?
Stm32-FatFs-Gzip - This project offers a simplified compressor that produces Gzip-compatible output with small resources for microcontrollers and edge computers. He uses the very basic LZ77 compression algorithm and static Deflate Huffman tree encoding to compress / decompress data into Gzip files.
infgen - Deflate disassember to convert a deflate, zlib, or gzip stream into a readable form.
figlet-fonts - my collection of figlet / toilet ascii art fonts
canvas_ity - A tiny, single-header <canvas>-like 2D rasterizer for C++
uzlib - Radically unbloated DEFLATE/zlib/gzip compression/decompression library. Can decompress any gzip/zlib data, and offers simplified compressor which produces gzip-compatible output, while requiring much less resources (and providing less compression ratio of course).
libpng - LIBPNG: Portable Network Graphics support, official libpng repository
minlzma - The Minimal LZMA (minlzma) project aims to provide a minimalistic, cross-platform, highly commented, standards-compliant C library (minlzlib) for decompressing LZMA2-encapsulated compressed data in LZMA format within an XZ container, as can be generated with Python 3.6, 7-zip, and xzutils
fpng - Super fast C++ .PNG writer/reader
zlib-ng - zlib replacement with optimizations for "next generation" systems.
UNITS - a compile-time, header-only, dimensional analysis and unit conversion library built on c++14 with no dependencies.
dichotomic-compression - Image compression algorithm, developed for research and educational purposes