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【Ruby】Zlibを使用して文字列を圧縮・展開する

Posted at 2019-10-11

事前準備

特に必要なし。

サンプルコード

# frozen_string_literal: true

require 'zlib'

# 圧縮前の文字列
str = 'Hello World' * 10_000

# 圧縮レベルを指定
# level = Zlib::NO_COMPRESSION # 圧縮しない
# level = Zlib::BEST_SPEED     # 速度優先で圧縮率は低い
level = Zlib::BEST_COMPRESSION # 圧縮率優先で速度は遅い

# 圧縮
deflated_str = Zlib::Deflate.deflate(str, level)

# 展開
inflated_str = Zlib::Inflate.inflate(deflated_str)

puts str.bytesize          # => 110000
puts deflated_str.bytesize # => 252
puts inflated_str.bytesize # => 110000

puts str == inflated_str # => true

参考

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