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require 'spec_helper'
shared_examples_for "CRC" do
describe ".implementation" do
it do
expect(described_class.implementation).to be(:pure).or(be(:c_ext))
end
end
it "should calculate a checksum for text" do
expect(described_class.hexdigest(string)).to be == expected
end
it "should calculate a checksum for multiple data" do
middle = (string.length / 2)
chunk1 = string[0...middle]
chunk2 = string[middle..-1]
crc = subject
crc << chunk1
crc << chunk2
expect(crc.hexdigest).to be == expected
end
it "should provide direct access to the checksum value" do
crc = subject
crc << string
expect(crc.checksum).to be == expected.to_i(16)
end
it "should be the length of the result of pack, based on width, and expressed in big endian" do
code = 0xf0f1f2f3f4f5f6f7f8f9fafbfcfdfeff
case described_class::WIDTH
when 1
# NOTE: The current Digest::CRC1 is an 8-bit checksum, so this code may change in the future
digest = "\xff".b
when 5
digest = "\x1f".b
when 8
digest = "\xff".b
when 15
digest = "\x7e\xff".b
when 16
digest = "\xfe\xff".b
when 24
digest = "\xfd\xfe\xff".b
when 32
digest = "\xfc\xfd\xfe\xff".b
when 64
digest = "\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff".b
else
raise "Need to enhance specs for unanticipated number of bits (for WIDTH is #{described_class::WIDTH})"
end
expect(described_class.pack(code)).to be == digest
end
if defined?(Ractor)
it "should calculate CRC inside ractor" do
digest = Ractor.new(described_class, string) do |klass, string|
klass.hexdigest(string)
end.take
expect(digest).to eq expected
end
end
end
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