Read files at the byte level - how to?

RLMuller · Sep 8, 2003

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Hi All,

I want to use Ruby to compare two Zip files to test whether they are =
identical. Accordingly, I want to read at the byte level, but I only =
see methods to read strings, i.e. gets, readline and readlines.

Is there a way to do what I want to do? Is there an example somewhere =
on the Web?

Thanks in advance.

Regards,
Richard

A programmer is a device for turning coffee into code.
Jeff Prosise (with an assist from Paul Erdos)

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<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>Hi All,</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I want to use Ruby to compare two Zip files to test =
whether=20
they are identical.  Accordingly,  I want to read at the byte =
level,=20
but I only see methods to read strings, i.e. gets, readline and=20
readlines.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Is there a way to do what I want to do?  Is =
there an=20
example somewhere on the Web?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Thanks in advance.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Regards,<BR>Richard</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>A programmer is a device for turning coffee into =
code.<BR>Jeff=20
Prosise (with an assist from Paul Erdos)<BR></FONT></DIV></BODY></HTML>

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nobu.nokada · Sep 8, 2003

Hi,

At Mon, 8 Sep 2003 12:47:01 +0900,

RLMuller said:
I want to use Ruby to compare two Zip files to test whether
they are identical. Accordingly, I want to read at the byte
level, but I only see methods to read strings, i.e. gets,
readline and readlines.

require 'fileutils'
FileUtils.cmp(file_a, file_b)

Or

require 'ftools'
File.cmp(file_a, file_b)

Gavin Sinclair · Sep 8, 2003

Hi All,

I want to use Ruby to compare two Zip files to test whether they are
identical. Accordingly, I want to read at the byte level, but I only
see methods to read strings, i.e. gets, readline and readlines.

Is there a way to do what I want to do? Is there an example somewhere
on the Web?

To get the whole file in one string:

bytes = File.open("filename", "rb") { |file| file.read }

Sadly, you can't do:

bytes = File.read("filename", "rb") # File::read assumes text mode

Anyway, "bytes" is now a string with the whole file in it. You can, of
course, read a certain number of bytes with "file.read(1024)" for
instance.

Sorry for any misinformation in this reply; it's based on experience, not
knowledge

Gavin

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Read files at the byte level - how to?

RLMuller

nobu.nokada

Gavin Sinclair

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