Feat-Ruby: add crc32, sha1, and md5 function

ruby/lib/pehape/string/crc32.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require "zlib"
+
+module Pehape
+  def self.crc32(string)
+    Zlib.crc32(string.to_s)
+  end
+end

ruby/lib/pehape/string/index.rb

@@ -12,3 +12,8 @@
 require_relative "hex2bin"
 require_relative "str_rot13"
 require_relative "ord"
+require_relative "crc32"
+require_relative "sha1"
+require_relative "sha1_file"
+require_relative "md5"
+require_relative "md5_file"

ruby/lib/pehape/string/md5.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require "digest"
+
+module Pehape
+  def self.md5(string, binary=nil)
+    result = Digest::MD5.new << string.to_s
+    binary ? result.digest : result.hexdigest
+  end
+end

ruby/lib/pehape/string/md5_file.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require "digest"
+
+module Pehape
+  def self.md5_file(filename, binary=nil)
+    return false unless File.exist?(filename.to_s)
+
+    result = Digest::MD5.file(filename.to_s)
+    binary ? result.digest : result.hexdigest
+  end
+end

ruby/lib/pehape/string/sha1.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require "digest"
+
+module Pehape
+  def self.sha1(string, binary=nil)
+    result = Digest::SHA1.new << string.to_s
+    binary ? result.digest : result.hexdigest
+  end
+end

ruby/lib/pehape/string/sha1_file.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require "digest"
+
+module Pehape
+  def self.sha1_file(filename, binary=nil)
+    return false unless File.exist?(filename.to_s)
+
+    result = Digest::SHA1.file(filename.to_s)
+    binary ? result.digest : result.hexdigest
+  end
+end

ruby/spec/pehape/string/crc32_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+RSpec.describe Pehape do
+  describe "crc32" do
+    it "returns the crc32 checksum of string as an integer." do
+      expect(Pehape.crc32("Hello World!")).to eq(472_456_355)
+    end
+  end
+end

ruby/spec/pehape/string/md5_file_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+RSpec.describe Pehape do
+  describe "md5_file" do
+    it "returns a string on success." do
+      filename = File.expand_path("./README.md")
+      expect(Pehape.md5_file(filename)).to eq("6cccfa61af5a5310f08f3fabcbe230ae")
+    end
+
+    it "returns false on fail." do
+      filename = File.expand_path("./robot.txt")
+      expect(Pehape.md5_file(filename)).to eq(false)
+    end
+  end
+end

ruby/spec/pehape/string/md5_spec.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+RSpec.describe Pehape do
+  describe "md5" do
+    it "returns the hash as a 32-character hexadecimal number." do
+      expect(Pehape.md5("Hello World!")).to eq("ed076287532e86365e841e92bfc50d8c")
+      expect(Pehape.md5("apple")).to eq("1f3870be274f6c49b3e31a0c6728957f")
+    end
+  end
+end

ruby/spec/pehape/string/sha1_file_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+RSpec.describe Pehape do
+  describe "sha1_file" do
+    it "returns file hash as a string on success." do
+      filename = File.expand_path("./README.md")
+      expect(Pehape.sha1_file(filename)).to eq("64285a71bb456bd05a5466ff7076bf2c377ecd57")
+    end
+
+    it "returns false on fail." do
+      filename = File.expand_path("./robot.txt")
+      expect(Pehape.sha1_file(filename)).to eq(false)
+    end
+  end
+end

ruby/spec/pehape/string/sha1_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+RSpec.describe Pehape do
+  describe "sha1" do
+    it "returns the sha1 hash as a string." do
+      expect(Pehape.sha1("Hello World!")).to eq("2ef7bde608ce5404e97d5f042f95f89f1c232871")
+    end
+  end
+end