Re^2: Binary Comparision

[extremely]

in reply to Re: Binary Comparision
in thread Binary Comparision

When I've built these sorts of byte and bit scanners in the past I've tended to use two buffers to read into. I make one buffer the size of the largest search string and the other twice that size. Then I scan across the larger buffer to the halfway point, move the 2nd half of the data in the buffer up and stick a new chunk on it.

Later, I gave up on that and just used a 4 or 8k buffer that I loaded the second half of and worked in it. This strategy beats the file-size limit and the span issue at the same time.

Bit-wise scanning sucks, tho. That just isn't fun in Perl 5.

[ikegami]

Thanks, but I've already implemented that my other post. I even optimized it to limit the amount of bytes that are scanned twice.

$block = substr($block, -($longuest_sig_len-1)) .    $_;
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^   ^^^^^^^^^
            Minimal portion of last block         New block