From: GOTOU Yuuzou <gotoyuzo@...>
Date: 2004-11-08T20:28:48+09:00
Subject: [ruby-dev:24748] "\000\000\000\001".unpack("N") returns [0]

Ruby 1.8で、Ruby 1.9のtest/ruby/test_pack.rbを試すとエラーに
なります。

% ruby18 -v test/ruby/test_pack.rb 
ruby 1.8.2 (2004-11-08) [x86_64-netbsd]
Loaded suite test/ruby/test_pack
Started
..FF
Finished in 0.013177 seconds.

  1) Failure:
test_pack_U(TestPack) [test/ruby/test_pack.rb:47]:
<RangeError> exception expected but was
Class: <ArgumentError>
Message: <"pack(U): value out of range">
---Backtrace---
test/ruby/test_pack.rb:47:in `pack'
test/ruby/test_pack.rb:47:in `test_pack_U'
test/ruby/test_pack.rb:47:in `assert_raise'
test/ruby/test_pack.rb:47:in `test_pack_U'
---------------

  2) Failure:
test_unpack_N(TestPack) [test/ruby/test_pack.rb:37]:
<1> expected but was
<0>.

4 tests, 17 assertions, 2 failures, 0 errors

unpack("N")の方は、unsigned longをntohl()に渡す際に上位(右の
方)の桁が落ちています。ここはswaplだとまずいんでしょうか？

pack("U")の方は1.9では起こらないようです。

-- 
ごとうゆうぞう