Re: Looking for Specific Bytes in a File
Re: Looking for Specific Bytes in a File
- Subject: Re: Looking for Specific Bytes in a File
- From: Andrew Oliver <email@hidden>
- Date: Fri, 13 Feb 2004 10:57:04 -0800
Make your life easier.
Get a copy of GraphicImporter (
http://www.osaxen.com/graphicsimporter.html
) which can do this for you in one step:
giget gi size image (choose file)
Andrew
:)
On 2/13/04 10:38 AM, "Marconi" <email@hidden> wrote:
>
I'm trying to open the data fork of a file and find the first
>
occurrence of the hex bytes '1108' then grab the following four bytes
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and return them as two decimal values.
>
>
What I'm doing:
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In a JPEG image file, it appears that the image width is in the two
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bytes following '1108' and the image height is the next two bytes
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after the width. These do not occur at a consistent offset. I'm
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intending on scripting some actions that depend on the dimensions of
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the JPEG image dropped onto the droplet script.
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I'm uncertain how to 'crawl' a file looking for that first '1108'.
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Should I convert 1108 to ASCII and search for that? Would it be
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better (faster) to search for '11' (or the ASCII thereof) first, then
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see if the next byte is '08'? Or would the difference be negligible?
>
>
Advice?
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