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require 'zlib'
require_relative '../../../spec_helper'
describe "Zlib::Inflate#inflate" do
before :each do
@inflator = Zlib::Inflate.new
end
it "inflates some data" do
data = [120, 156, 99, 96, 128, 1, 0, 0, 10, 0, 1].pack('C*')
unzipped = @inflator.inflate data
@inflator.finish
unzipped.should == "\000" * 10
end
it "inflates lots of data" do
data = [120, 156, 237, 193, 1, 1, 0, 0] +
[0, 128, 144, 254, 175, 238, 8, 10] +
Array.new(31, 0) +
[24, 128, 0, 0, 1]
unzipped = @inflator.inflate data.pack('C*')
@inflator.finish
unzipped.should == "\000" * 32 * 1024
end
it "works in pass-through mode, once finished" do
data = [120, 156, 99, 96, 128, 1, 0, 0, 10, 0, 1]
@inflator.inflate data.pack('C*')
@inflator.finish # this is a precondition
out = @inflator.inflate('uncompressed_data')
out << @inflator.finish
out.should == 'uncompressed_data'
@inflator << ('uncompressed_data') << nil
@inflator.finish.should == 'uncompressed_data'
end
it "has a binary encoding" do
data = [120, 156, 99, 96, 128, 1, 0, 0, 10, 0, 1].pack('C*')
unzipped = @inflator.inflate data
@inflator.finish.encoding.should == Encoding::BINARY
unzipped.encoding.should == Encoding::BINARY
end
end
describe "Zlib::Inflate.inflate" do
it "inflates some data" do
data = [120, 156, 99, 96, 128, 1, 0, 0, 10, 0, 1]
unzipped = Zlib::Inflate.inflate data.pack('C*')
unzipped.should == "\000" * 10
end
it "inflates lots of data" do
data = [120, 156, 237, 193, 1, 1, 0, 0] +
[0, 128, 144, 254, 175, 238, 8, 10] +
Array.new(31,0) +
[24, 128, 0, 0, 1]
zipped = Zlib::Inflate.inflate data.pack('C*')
zipped.should == "\000" * 32 * 1024
end
it "properly handles data in chunks" do
data = [120, 156, 75, 203, 207, 7, 0, 2, 130, 1, 69].pack('C*')
z = Zlib::Inflate.new
# add bytes, one by one
result = ""
data.each_byte { |d| result << z.inflate(d.chr)}
result << z.finish
result.should == "foo"
end
it "properly handles incomplete data" do
data = [120, 156, 75, 203, 207, 7, 0, 2, 130, 1, 69].pack('C*')[0,5]
z = Zlib::Inflate.new
# add bytes, one by one, but not all
result = ""
data.each_byte { |d| result << z.inflate(d.chr)}
-> { result << z.finish }.should raise_error(Zlib::BufError)
end
it "properly handles excessive data, byte-by-byte" do
main_data = [120, 156, 75, 203, 207, 7, 0, 2, 130, 1, 69].pack('C*')
data = main_data * 2
result = ""
z = Zlib::Inflate.new
# add bytes, one by one
data.each_byte { |d| result << z.inflate(d.chr)}
result << z.finish
# the first chunk is inflated to its completion,
# the second chunk is just passed through.
result.should == "foo" + main_data
end
it "properly handles excessive data, in one go" do
main_data = [120, 156, 75, 203, 207, 7, 0, 2, 130, 1, 69].pack('C*')
data = main_data * 2
result = ""
z = Zlib::Inflate.new
result << z.inflate(data)
result << z.finish
# the first chunk is inflated to its completion,
# the second chunk is just passed through.
result.should == "foo" + main_data
end
end
describe "Zlib::Inflate#inflate" do
before do
@zeros = Zlib::Deflate.deflate("0" * 100_000)
@inflator = Zlib::Inflate.new
@chunks = []
end
describe "without break" do
before do
@inflator.inflate(@zeros) do |chunk|
@chunks << chunk
end
end
it "inflates chunked data" do
@chunks.map { |chunk| chunk.size }.should == [16384, 16384, 16384, 16384, 16384, 16384, 1696]
end
it "properly handles chunked data" do
@chunks.all? { |chunk| chunk =~ /\A0+\z/ }.should be_true
end
end
describe "with break" do
before do
@inflator.inflate(@zeros) do |chunk|
@chunks << chunk
break
end
end
it "inflates chunked break" do
output = @inflator.inflate nil
(100_000 - @chunks.first.length).should == output.length
end
end
end
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