class IOP::ZstdDecompressor

Filter class to perform Gzip data compression.

This class is an adapter for the standard Ruby Zlib::GzipWriter class.

This class can decompress .zst files.

### Use case: decompress a .zst file and compute MD5 hash sum of uncompressed data.

require 'iop/file'
require 'iop/digest'
require 'iop/zstdlib'
( IOP::FileReader.new('hello.zst') | IOP::ZstdDecompressor.new | (d = IOP::DigestComputer.new(Digest::MD5.new)) ).process!
puts d.digest.hexdigest

@note this class depends on external zstdlib gem. @since 0.1

Public Class Methods

new(*args) click to toggle source

Creates class instance.

@param args [Array] arguments passed to Zstdlib::Inflate constructor

# File lib/iop/zstdlib.rb, line 81
def initialize(*args)
  @args = args
end

Public Instance Methods

process(data = nil) click to toggle source
Calls superclass method IOP::Sink#process
# File lib/iop/zstdlib.rb, line 85
def process(data = nil)
  if data.nil?
    super(@inflate.finish)
    super
  else
    super(@inflate.inflate(data))
  end
end
process!() click to toggle source
Calls superclass method IOP::Sink#process!
# File lib/iop/zstdlib.rb, line 94
def process!
  @inflate = Zstdlib::Inflate.new(*@args)
  begin
    super
  ensure
    @inflate.close
  end
end