2018-03-04 10:09:32 -05:00
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require_relative '../../spec_helper'
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2017-05-07 08:04:49 -04:00
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require 'zlib'
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describe "Zlib.crc32" do
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it "calculates CRC checksum for string" do
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Zlib.crc32("").should == 0
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Zlib.crc32(" ").should == 3916222277
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Zlib.crc32("123456789").should == 3421780262
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Zlib.crc32("!@#\{$\}%^&**()").should == 2824518887
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Zlib.crc32("to be or not to be" * 22).should == 1832379978
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Zlib.crc32("0").should == 4108050209
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Zlib.crc32((2**32).to_s).should == 3267533297
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Zlib.crc32((2**64).to_s).should == 653721760
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end
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it "calculates CRC checksum for string and initial CRC value" do
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test_string = "This is a test string! How exciting!%?"
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# Zlib.crc32(test_string, -2**28).should == 3230195786
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# Zlib.crc32(test_string, -2**20).should == 2770207303
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# Zlib.crc32(test_string, -2**16).should == 2299432960
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# Zlib.crc32(test_string, -2**8).should == 861809849
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# Zlib.crc32(test_string, -1).should == 2170124077
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Zlib.crc32(test_string, 0).should == 3864990561
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Zlib.crc32(test_string, 1).should == 1809313411
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Zlib.crc32(test_string, 2**8).should == 1722745982
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Zlib.crc32(test_string, 2**16).should == 1932511220
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2018-10-27 06:48:40 -04:00
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Zlib.crc32("p", ~305419896).should == 4046865307
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Zlib.crc32("p", -305419897).should == 4046865307
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2019-07-27 06:40:09 -04:00
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-> { Zlib.crc32(test_string, 2**128) }.should raise_error(RangeError)
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2017-05-07 08:04:49 -04:00
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end
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2020-12-20 11:16:26 -05:00
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it "calculates the CRC checksum for string and initial CRC value for Integers" do
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2017-05-07 08:04:49 -04:00
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test_string = "This is a test string! How exciting!%?"
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# Zlib.crc32(test_string, -2**30).should == 277228695
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Zlib.crc32(test_string, 2**30).should == 46597132
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end
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it "assumes that the initial value is given to crc, if crc is omitted" do
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orig_crc = Zlib.crc32
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Zlib.crc32("").should == Zlib.crc32("", orig_crc)
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Zlib.crc32(" ").should == Zlib.crc32(" ", orig_crc)
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Zlib.crc32("123456789").should == Zlib.crc32("123456789", orig_crc)
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Zlib.crc32("!@#\{$\}%^&**()").should == Zlib.crc32("!@#\{$\}%^&**()", orig_crc)
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Zlib.crc32("to be or not to be" * 22).should == Zlib.crc32("to be or not to be" * 22, orig_crc)
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Zlib.crc32("0").should == Zlib.crc32("0", orig_crc)
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Zlib.crc32((2**32).to_s).should == Zlib.crc32((2**32).to_s, orig_crc)
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Zlib.crc32((2**64).to_s).should == Zlib.crc32((2**64).to_s, orig_crc)
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end
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it "it returns the CRC initial value, if string is omitted" do
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Zlib.crc32.should == 0
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end
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end
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