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Contents
# -*- encoding: utf-8 -*- require_relative 'common' require 'hexapdf/filter/lzw_decode' describe HexaPDF::Filter::LZWDecode do include CommonFilterTests before do @obj = HexaPDF::Filter::LZWDecode @all_test_cases ||= [["-----A---B", "\x80\x0b\x60\x50\x22\x0c\x0c\x85\x01"], ['abcabcaaaabbbcdeffffffagggggg', "\x80\x18LF8\x14\x10\xC3\a1BLfC)\x9A\x1D\x0F0\x99\xE2Q8\b"], ].each {|a, b| a.force_encoding(Encoding::BINARY); b.force_encoding(Encoding::BINARY)} @decoded = @all_test_cases[0][0] @encoded = @all_test_cases[0][1] @encoded_predictor = "\x80\x00\x85\xA0 \x04\x12\r\x05\n\x00\x9D\x90p\x10V\x02".force_encoding(Encoding::BINARY) @predictor_opts = {Predictor: 12} end describe "decoder" do it "applies the Predictor after decoding" do assert_equal(@decoded, collector(@obj.decoder(feeder(@encoded_predictor.dup), @predictor_opts))) end it "fails if an unknown code is found after CLEAR_TABLE" do assert_raises(HexaPDF::FilterError) { @obj.decoder(feeder("\xff\xff")).resume } end it "fails if an unknown code is found elsewhere" do assert_raises(HexaPDF::FilterError) { @obj.decoder(feeder("\x00\x7f\xff\xf0")).resume } end it "fails if the code size would be more than 12bit" do stream = HexaPDF::Utils::BitStreamWriter.new result = stream.write(256, 9) result << stream.write(65, 9) 258.upto(510) {|i| result << stream.write(i, 9)} 511.upto(1022) {|i| result << stream.write(i, 10)} 1023.upto(2046) {|i| result << stream.write(i, 11)} 2047.upto(4095) {|i| result << stream.write(i, 12)} result << stream.write(96, 12) result << stream.finalize assert_raises(HexaPDF::FilterError) { @obj.decoder(feeder(result)).resume } end end describe "encoder" do it "applies the Predictor before encoding" do assert_equal(@encoded_predictor, collector(@obj.encoder(feeder(@decoded.dup), @predictor_opts))) end end end
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6 entries across 6 versions & 1 rubygems