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RE: [Classpath] RE: Informative throws


From: C. Scott Ananian
Subject: RE: [Classpath] RE: Informative throws
Date: Fri, 27 Jul 2001 12:28:26 -0400 (EDT)

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

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              ( 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 <address@hidden>
# 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])address@hidden;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))address@hidden"C*",@a}';s/x/pack+/g;eval




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