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require File.expand_path('../../../spec_helper', __FILE__)
require 'zlib'
describe "Zlib.adler32" do
it "calculates Adler checksum for string" do
Zlib.adler32("").should == 1
Zlib.adler32(" ").should == 2162721
Zlib.adler32("123456789").should == 152961502
Zlib.adler32("!@#\{$\}%^&**()").should == 365495023
Zlib.adler32("to be or not to be" * 22).should == 3979904837
Zlib.adler32("0").should == 3211313
Zlib.adler32((2**32).to_s).should == 193331739
Zlib.adler32((2**64).to_s).should == 723452953
end
it "calculates Adler checksum for string and initial Adler value" do
test_string = "This is a test string! How exciting!%?"
Zlib.adler32(test_string, 0).should == 63900955
Zlib.adler32(test_string, 1).should == 66391324
Zlib.adler32(test_string, 2**8).should == 701435419
Zlib.adler32(test_string, 2**16).should == 63966491
lambda { Zlib.adler32(test_string, 2**128) }.should raise_error(RangeError)
end
it "calculates the Adler checksum for string and initial Adler value for Bignums" do
test_string = "This is a test string! How exciting!%?"
Zlib.adler32(test_string, 2**30).should == 1137642779
end
it "assumes that the initial value is given to adler, if adler is omitted" do
orig_crc = Zlib.adler32
Zlib.adler32("").should == Zlib.adler32("", orig_crc)
Zlib.adler32(" ").should == Zlib.adler32(" ", orig_crc)
Zlib.adler32("123456789").should == Zlib.adler32("123456789", orig_crc)
Zlib.adler32("!@#\{$\}%^&**()").should == Zlib.adler32("!@#\{$\}%^&**()", orig_crc)
Zlib.adler32("to be or not to be" * 22).should == Zlib.adler32("to be or not to be" * 22, orig_crc)
Zlib.adler32("0").should == Zlib.adler32("0", orig_crc)
Zlib.adler32((2**32).to_s).should == Zlib.adler32((2**32).to_s, orig_crc)
Zlib.adler32((2**64).to_s).should == Zlib.adler32((2**64).to_s, orig_crc)
end
it "it returns the CRC initial value, if string is omitted" do
Zlib.adler32.should == 1
end
end
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