asar - Electron Archive format for Crystal

Read files from .asar archives with built-in caching.

Installation

Add this to your application's shard.yml:

dependencies:
  asar:
    github: petoem/asar

Usage

require "asar"

asar = Asar::Reader.new "path/to/your/archive.asar"
io = asar.get "/awesome/image.png"
slice = asar.get_bytes "/awesome/story.txt"

asar.files # Returns an Array(String) of all files in the archive. 
asar.files_cached # Returns an Array(String) of all files in the cache. 

Benchmark

> crystal run spec/benchmark.cr --release

      get   3.21M (311.09ns) (±14.27%)   4.64× slower
get_bytes   14.9M ( 67.09ns) (± 1.47%)        fastest
 read_raw  69.21k ( 14.45µs) (±16.62%) 215.36× slower

Note: Benchmark was done on an SSD and the test file was small.

The methods get and get_bytes cache a file at first read.

• get returns an IO::Memory created from the cached file
• get_bytes returns the cached file
• read_raw reads directly from the files IO, bypassing the cache

TODO

• [x] Parse asar archive
• [x] Read files from archive
• [ ] Pack directory into archive?
• [ ] Transform support?

Contributing

1. Fork it ( https://github.com/petoem/asar/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• petoem Michael Petö - creator, maintainer