[Tutor] Search for hex data in file

[xbmuncher]

I've been reading about ways to convert strings and what not to hex and back
and forth. I'm looking for the fastest and least memory intensive way to
search through a file for a hex value and gets its byte offset in the file.
This hex value (that I'm looking for in the file) is of course a hex
representation of the binary data and its 8 bytes long.
I figured reading the whole file and converting it to hex from ascii..etc..
would be overkill, especially if its a large file.
What do you guys recommend? I want to search the file for certain hex value
and get the byte offset within the file.

Thanks for reading.
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