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require File.expand_path('../../../../spec_helper', __FILE__)
require 'stringio'
require 'zlib'
describe 'GzipReader#ungetbyte' 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
describe 'at the start of the stream' do
before :each do
@gz = Zlib::GzipReader.new(@io)
end
describe 'with an integer' do
it 'prepends the byte to the stream' do
@gz.ungetbyte 0x21
@gz.read.should == '!12345abcde'
end
it 'decrements pos' do
@gz.ungetbyte 0x21
@gz.pos.should == -1
end
end
describe 'with nil' do
it 'does not prepend anything to the stream' do
@gz.ungetbyte nil
@gz.read.should == '12345abcde'
end
it 'does not decrement pos' do
@gz.ungetbyte nil
@gz.pos.should == 0
end
end
end
describe 'in the middle of the stream' do
before :each do
@gz = Zlib::GzipReader.new(@io)
@gz.read 5
end
describe 'with an integer' do
it 'inserts the corresponding character into the stream' do
@gz.ungetbyte 0x21
@gz.read.should == '!abcde'
end
it 'decrements pos' do
@gz.ungetbyte 0x21
@gz.pos.should == 4
end
end
describe 'with nil' do
it 'does not insert anything into the stream' do
@gz.ungetbyte nil
@gz.read.should == 'abcde'
end
it 'does not decrement pos' do
@gz.ungetbyte nil
@gz.pos.should == 5
end
end
end
describe 'at the end of the stream' do
before :each do
@gz = Zlib::GzipReader.new(@io)
@gz.read
end
describe 'with an integer' do
it 'appends the corresponding character to the stream' do
@gz.ungetbyte 0x21
@gz.read.should == '!'
end
it 'decrements pos' do
@gz.ungetbyte 0x21
@gz.pos.should == 9
end
it 'makes eof? false' do
@gz.ungetbyte 0x21
@gz.eof?.should be_false
end
end
describe 'with nil' do
it 'does not append anything to the stream' do
@gz.ungetbyte nil
@gz.read.should == ''
end
it 'does not decrement pos' do
@gz.ungetbyte nil
@gz.pos.should == 10
end
it 'does not make eof? false' do
@gz.ungetbyte nil
@gz.eof?.should be_true
end
end
end
end
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