On Saturday 02 June 2007 20:21:13 Prakash Punnoor wrote:
> Daniel Hazelton wrote:
> > Signed-off-by: Daniel Hazelton <[email protected]>
> >
> > DRH
> >
> > diff --git a/fs/jffs2/compr_zlib.c b/fs/jffs2/compr_zlib.c
> > index 2b87fcc..9f1b935 100644
> > --- a/fs/jffs2/compr_zlib.c
> > +++ b/fs/jffs2/compr_zlib.c
> > @@ -16,7 +16,6 @@
> > #include <linux/kernel.h>
> > #include <linux/slab.h>
> > #include <linux/zlib.h>
> > -#include <linux/zutil.h>
> > #include "nodelist.h"
> > #include "compr.h"
> >
> > @@ -154,7 +153,7 @@ static int jffs2_zlib_decompress(unsigned char
> > *data_in,
> >
> > /* If it's deflate, and it's got no preset dictionary, then
> > we can tell zlib to skip the adler32 check. */
> > - if (srclen > 2 && !(data_in[1] & PRESET_DICT) &&
> > + if (srclen > 2 && !(data_in[1] & 0x20) &&
> > ((data_in[0] & 0x0f) == Z_DEFLATED) &&
> > !(((data_in[0]<<8) + data_in[1]) % 31)) {
>
> Why not
>
> #define PRESET_DICT 0x20
>
> instead of obfuscating the code with a magic number ? (Or name it
> differently if it clashes with something else...)
>
>
> Cheers,
>
> Prakash
Not a problem. This patch was just a result of a quick s/PRESET_DICT/0x20/p -
I'll change the patch so there is a localized PRESET_DICT macro.
I've attached an updated patch that does just that.
(Mark Adler suggested a second, more involved patch that would put the burdon
of all the checking that JFFS2 is doing where it belongs, and already is done
actually, zlib's inflate() )
DRH
diff --git a/fs/jffs2/compr_zlib.c b/fs/jffs2/compr_zlib.c
index 2b87fcc..f4519db 100644
--- a/fs/jffs2/compr_zlib.c
+++ b/fs/jffs2/compr_zlib.c
@@ -16,7 +16,6 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/zlib.h>
-#include <linux/zutil.h>
#include "nodelist.h"
#include "compr.h"
@@ -29,6 +28,13 @@
*/
#define STREAM_END_SPACE 12
+/*
+ * PRESET_DICT is set in the internal (aka: private) zlib header zutil.h
+ * the value - 0x20 - is defined in RFC 1950, so making a duplicate
+ * definition here to remove this code's dependency on that file is safe.
+ */
+#define PRESET_DICT 0x20
+
static DEFINE_MUTEX(deflate_mutex);
static DEFINE_MUTEX(inflate_mutex);
static z_stream inf_strm, def_strm;
diff --git a/fs/jffs2/compr_zlib.c b/fs/jffs2/compr_zlib.c
index 2b87fcc..f4519db 100644
--- a/fs/jffs2/compr_zlib.c
+++ b/fs/jffs2/compr_zlib.c
@@ -16,7 +16,6 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/zlib.h>
-#include <linux/zutil.h>
#include "nodelist.h"
#include "compr.h"
@@ -29,6 +28,13 @@
*/
#define STREAM_END_SPACE 12
+/*
+ * PRESET_DICT is set in the internal (aka: private) zlib header zutil.h
+ * the value - 0x20 - is defined in RFC 1950, so making a duplicate
+ * definition here to remove this code's dependency on that file is safe.
+ */
+#define PRESET_DICT 0x20
+
static DEFINE_MUTEX(deflate_mutex);
static DEFINE_MUTEX(inflate_mutex);
static z_stream inf_strm, def_strm;
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