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combining NSData objects?

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combining NSData objects?

Subject: combining NSData objects?
From: justin webster <email@hidden>
Date: Mon, 21 Feb 2005 16:03:39 +1300

I am trying to extract metadata from a file, modify part of it then write back to the file. I can extract the relevant bits and make a new NSdata object with the modified info but I'm not sure where to go from here.

so my questions are:
how do I replace a range of bytes in an NSdata object?
or - how do I join NSdata the way I join strings?

these are potentially large files so I would rather not copy everything into memory if possible.

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