https://github.com/aka411/png-decoder

A simple PNG (Portable Network Graphic) file decoder written in plain JavaScript without using any external libraries.
https://github.com/aka411/png-decoder

deflate-decompression huffman-decoding lz77-decoding png png-decoder

Last synced: about 1 year ago
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A simple PNG (Portable Network Graphic) file decoder written in plain JavaScript without using any external libraries.

• Host: GitHub
• URL: https://github.com/aka411/png-decoder
• Owner: aka411
• License: mit
• Created: 2025-02-01T08:12:15.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-02-08T07:35:27.000Z (over 1 year ago)
• Last Synced: 2025-02-17T11:35:24.377Z (over 1 year ago)
• Topics: deflate-decompression, huffman-decoding, lz77-decoding, png, png-decoder
• Language: JavaScript
• Homepage:
• Size: 18.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# png-decoder

A simple PNG (Portable Network Graphic) decoder written in plain JavaScript without using any libraries.I wrote this as a learning exercise and is one of my earlier projects and is badly organized and unreadable. 

I wrote this as i was curious about how file compression works.I learned a lot while writing this, implemented functions to decompress  data compressed using DEFLATE (lossless data compression algorithm involving a combination of LZ77 and Huffman coding).

## Resources that helped me write this decoder

* For Png Specification [PNG SPECIFICATION](http://www.libpng.org/pub/png/spec/1.2/png-1.2.pdf)

* For ZLIB Compressed Data Format Specification [ZLIB Data Format](https://www.ietf.org/rfc/rfc1950.txt)

* For Deflate compression [Deflate](https://www.rfc-editor.org/rfc/rfc1951.html)