On Fri, 27 Jul 2001, Eric Blake wrote:
> No, I stand by my code. If the final loop ends with a negative result, it
> is necessarily MIN_VALUE, since otherwise there was overflow.
> But -MIN_VALUE == MIN_VALUE, so no harm is done! Compile it and see...
i stand corrected. i'll read the code more carefully next time. =)
--s
FSF ammunition operation Morwenstow Peking Ortega Saddam Hussein Minister
Kojarena Seattle SSBN 731 MI5 Philadelphia UKUSA cryptographic BATF
( http://lesser-magoo.lcs.mit.edu/~cananian )
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[http://www.cs.cmu.edu/~dst/DeCSS/Gallery/]
#!/usr/bin/perl -w
# 526-byte qrpff, Keith Winstein and Marc Horowitz <[EMAIL PROTECTED]>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
$_='while(read+STDIN,$_,2048){$a=29;$c=142;if((@a=unx"C*",$_)[20]&48){$h=5;
$_=unxb24,join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$b=73;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=($t=255)&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9
,$_=(map{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t
^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)[$_%8]}(16..271))
[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}print+x"C*",@a}';s/x/pack+/g;eval
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