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Ah yes *doh*... Thanks all for your replies. I haven't been able to test it yet but I don't doubt that my problem is hereby solved. However obvious it was, it didn't occur to me before because lua generally doesn't tend to care about the contents of a string (such as \0, ^Z, LF/CR), nor perform any conversions. That is the mindset I'm in when programming in lua. Also at a glance, the manual entry for didn't of course list the "rb" option explicitly, but now I do remember having read once that it takes all the same arguments as its C counterpart.

Sorry, and thanks :-)

From: "Adam D. Moss" <>
Reply-To: Lua list <>
To: Lua list <>
Subject: Re: file read problem
Date: Wed, 16 Nov 2005 10:19:14 +0000

Philippe Lhoste wrote:
Try "rb" and "wb" as the 2-nd parameter to

Yes, that's that. I tested this code on a Unix-style file (the Lua manual) and since I ran it on Windows, I actually got a bigger file: LFs were transformed to CR+LFs.

Binary files were indeed truncated. Probably on first \0 found... Adding b is the way to go with binary files or if you want to preserve original EOL.

IIRC, ^Z was treated as an EOF marker on 'DOS text' files.