From: Austin Ziegler <halostatue@...>
Date: 2005-10-26T01:03:52+09:00
Subject: Re: ruby gives different answer for checksum of files on windows and FreeBSD?

On 10/25/05, Michael Campbell <michael.campbell@gmail.com> wrote:
> "Ara.T.Howard" <Ara.T.Howard@noaa.gov> writes:
>> On Tue, 25 Oct 2005, Yukihiro Matsumoto wrote:
>>> Hi,
>>> In message "Re: ruby gives different answer for checksum of files on
>>> windows and FreeBSD?" on Tue, 25 Oct 2005 17:37:02 +0900, Ralph
>>> Smith <ralph@lkjlkj.com> writes:
>>>| f = File.new(fname)
>>> Try
>>>
>>>  f = File.new(fname, "rb")
>>>
>>> and see how it works.
>> this comes up so often - would it make sense to be the default mode
>> on windows?
> I'm guessing here, but my guess is that reading text files with ruby
> is more common than non-text files.  Does "rb" affect that?

Some. I *always* open files in Ruby with "rb" or "wb" on Windows. Here's
the difference, though:

  irb(main):001:0> File.open("test.txt", "w") { |ff|
  irb(main):002:1* ff.write <<-EOS
  irb(main):003:1" Now is the time
  irb(main):004:1"   for all good people
  irb(main):005:1" to rock.
  irb(main):006:1" EOS
  irb(main):007:1> }
  => 47
  irb(main):008:0> a = File.open("test.txt", "r") { |ff| ff.read }
  => "Now is the time\n  for all good people\nto rock.\n"
  irb(main):009:0> b = File.open("test.txt", "rb") { |ff| ff.read }
  => "Now is the time\r\n  for all good people\r\nto rock.\r\n"

Note that a has only \n and b has \r\n. With "r", Ruby translates away
the \r\n to \n only; with "rb" you have to look out for it yourself.

A simple #chomp (or #chomp!) operation, however, will eliminate both \n
and \r\n.

-austin
--
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca