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require_relative '../../../spec_helper'
require 'stringio'
require 'zlib'
describe "Zlib::GzipReader#read" do
before :each do
@data = '12345abcde'
@zip = [31, 139, 8, 0, 44, 220, 209, 71, 0, 3, 51, 52, 50, 54, 49, 77,
76, 74, 78, 73, 5, 0, 157, 5, 0, 36, 10, 0, 0, 0].pack('C*')
@io = StringIO.new @zip
end
it "with no arguments reads the entire content of a gzip file" do
gz = Zlib::GzipReader.new @io
gz.read.should == @data
end
it "with nil length argument reads the entire content of a gzip file" do
gz = Zlib::GzipReader.new @io
gz.read(nil).should == @data
end
it "reads the contents up to a certain size" do
gz = Zlib::GzipReader.new @io
gz.read(5).should == @data[0...5]
gz.read(5).should == @data[5...10]
end
it "does not accept a negative length to read" do
gz = Zlib::GzipReader.new @io
-> {
gz.read(-1)
}.should raise_error(ArgumentError)
end
it "returns an empty string if a 0 length is given" do
gz = Zlib::GzipReader.new @io
gz.read(0).should == ""
end
it "respects :external_encoding option" do
gz = Zlib::GzipReader.new(@io, external_encoding: 'UTF-8')
gz.read.encoding.should == Encoding::UTF_8
@io.rewind
gz = Zlib::GzipReader.new(@io, external_encoding: 'UTF-16LE')
gz.read.encoding.should == Encoding::UTF_16LE
end
describe "at the end of data" do
it "returns empty string if length parameter is not specified or 0" do
gz = Zlib::GzipReader.new @io
gz.read # read till the end
gz.read(0).should == ""
gz.read().should == ""
gz.read(nil).should == ""
end
it "returns nil if length parameter is positive" do
gz = Zlib::GzipReader.new @io
gz.read # read till the end
gz.read(1).should be_nil
gz.read(2**16).should be_nil
end
end
end
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