From: Jay Daniels <jkdaniels@...>
Date: 2006-07-16T17:25:43+09:00
Subject: Newbie question on an I/O loop

I got a question that's puzzling me. Am new to Ruby but programming for 
decades. Here's the problem. This apparently simple loop reads 396 bytes 
of a file and no more. The actual file is 1.5KB and I can display it 
easily in a hex dumper. The bytes Ruby has read are all correct. It just 
seems to stop after 396 bytes. Any idea what's wrong or where I should 
be looking?

Many thanks in advance,

JK Daniels

>>> code >>>

if ARGV[0] == nil
    puts( "\n" + $help )
else
    i = 0
    tfm = File.open( ARGV[0] )
    tfm.each_byte{ |c| i = i + 1; printf( "%d: %X\n", i, c ) }
    if tfm.eof
        puts "at eof" else puts "not at eof"
    end
end

<<< end code <<<

This outputs the first 396 bytes and then state it's at EOF. If it makes 
any difference, the last three bytes it reads are (all hex): C0 A4 00 
and the next three (unread) bytes in the file are: 1A C0 B5

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