require_relative '../../../spec_helper'
require 'stringio'
require 'zlib'

describe "Zlib::GzipReader#eof?" do
  before :each do
    @data = '{"a":1234}'
    @zip = [31, 139, 8, 0, 0, 0, 0, 0, 0, 3, 171, 86, 74, 84, 178, 50,
            52, 50, 54, 169, 5, 0, 196, 20, 118, 213, 10, 0, 0, 0].pack('C*')
    @io = StringIO.new @zip
  end

  it "returns true when at EOF" do
    gz = Zlib::GzipReader.new @io
    gz.eof?.should == false
    gz.read
    gz.eof?.should == true
  end

  it "returns true when at EOF with the exact length of uncompressed data" do
    gz = Zlib::GzipReader.new @io
    gz.eof?.should == false
    gz.read(10)
    gz.eof?.should == true
  end

  it "returns true when at EOF with a length greater than the size of uncompressed data" do
    gz = Zlib::GzipReader.new @io
    gz.eof?.should == false
    gz.read(11)
    gz.eof?.should == true
  end

  it "returns false when at EOF when there's data left in the buffer to read" do
    gz = Zlib::GzipReader.new @io
    gz.read(9)
    gz.eof?.should == false
    gz.read
    gz.eof?.should == true
  end

  # This is especially important for JRuby, since eof? there
  # is more than just a simple accessor.
  it "does not affect the reading data" do
    gz = Zlib::GzipReader.new @io
    0.upto(9) do |i|
      gz.eof?.should == false
      gz.read(1).should == @data[i, 1]
    end
    gz.eof?.should == true
    gz.read.should == ""
    gz.eof?.should == true
  end
end

describe "Zlib::GzipReader#eof" do
  it "is an alias of Zlib::GzipReader#eof?" do
    Zlib::GzipReader.instance_method(:eof).should ==
      Zlib::GzipReader.instance_method(:eof?)
  end
end
