Re: [Patch] 2.5.70-bk11 zlib merge #4 pure magic

From: Bartlomiej Zolnierkiewicz (B.Zolnierkiewicz@elka.pw.edu.pl)
Date: Fri Jun 06 2003 - 15:36:07 EST


On Fri, 6 Jun 2003, [iso-8859-1] Jörn Engel wrote:

> Hi Linus!
>
> This one is pure magic, really. No comment and inspection of the code
> doesn't show much either. But judging from the other changes, this
> should also fix a real problem, at least a theoretical one.

Eee, no magic here :-).

from 1.1.4 ChangeLog:
"- force windowBits > 8 to avoid a bug in the encoder for a window size
   of 256 bytes. (A complete fix will be available in 1.1.5)."

I guess complete fix is here:
http://www.cs.toronto.edu/~cosmin/pngtech/zlib-256win-bug.html

Regards,

--
Bartlomiej

> The only code that could be bitten by this change is ppp, so I changed > that as well. Paulus, could you have a quick look at it? > > Jörn > > -- > This above all: to thine own self be true. > -- Shakespeare > > --- linux-2.5.70-bk11/lib/zlib_deflate/deflate.c~zlib_merge_magic 2003-06-06 20:44:51.000000000 +0200 > +++ linux-2.5.70-bk11/lib/zlib_deflate/deflate.c 2003-06-06 22:05:30.000000000 +0200 > @@ -216,7 +216,7 @@ > windowBits = -windowBits; > } > if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || > - windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || > + windowBits < 9 || windowBits > 15 || level < 0 || level > 9 || > strategy < 0 || strategy > Z_HUFFMAN_ONLY) { > return Z_STREAM_ERROR; > } > --- linux-2.5.70-bk11/include/linux/ppp-comp.h~zlib_merge_magic 2003-06-05 17:46:35.000000000 +0200 > +++ linux-2.5.70-bk11/include/linux/ppp-comp.h 2003-06-06 22:07:08.000000000 +0200 > @@ -182,7 +182,7 @@ > #define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */ > #define CILEN_DEFLATE 4 /* length of its config option */ > > -#define DEFLATE_MIN_SIZE 8 > +#define DEFLATE_MIN_SIZE 9 > #define DEFLATE_MAX_SIZE 15 > #define DEFLATE_METHOD_VAL 8 > #define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE)

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