[PATCH] zlib_inflate: Upgrade library code to a recent version

Upgrade the zlib_inflate implementation in the kernel from a patched
version 1.1.3/4 to a patched 1.2.3.

The code in the kernel is about seven years old and I noticed that the
external zlib library's inflate performance was significantly faster (~50%)
than the code in the kernel on ARM (and faster again on x86_32).

For comparison the newer deflate code is 20% slower on ARM and 50% slower
on x86_32 but gives an approx 1% compression ratio improvement.  I don't
consider this to be an improvement for kernel use so have no plans to
change the zlib_deflate code.

Various changes have been made to the zlib code in the kernel, the most
significant being the extra functions/flush option used by ppp_deflate.
This update reimplements the features PPP needs to ensure it continues to
work.

This code has been tested on ARM under both JFFS2 (with zlib compression
enabled) and ppp_deflate and on x86_32.  JFFS2 sees an approx.  10% real
world file read speed improvement.

This patch also removes ZLIB_VERSION as it no longer has a correct value.
We don't need version checks anyway as the kernel's module handling will
take care of that for us.  This removal is also more in keeping with the
zlib author's wishes (http://www.zlib.net/zlib_faq.html#faq24) and I've
added something to the zlib.h header to note its a modified version.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Joern Engel <joern@wh.fh-wedel.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 48 deletions

diff --git a/lib/zlib_inflate/infblock.h b/lib/zlib_inflate/infblock.h
deleted file mode 100644
index ceee60b5107c..000000000000
--- a/lib/zlib_inflate/infblock.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/* infblock.h -- header to use infblock.c
- * Copyright (C) 1995-1998 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h 
- */
-
-/* WARNING: this file should *not* be used by applications. It is
-   part of the implementation of the compression library and is
-   subject to change. Applications should only use zlib.h.
- */
-
-#ifndef _INFBLOCK_H
-#define _INFBLOCK_H
-
-struct inflate_blocks_state;
-typedef struct inflate_blocks_state inflate_blocks_statef;
-
-extern inflate_blocks_statef * zlib_inflate_blocks_new (
-    z_streamp z,
-    check_func c,              /* check function */
-    uInt w);                   /* window size */
-
-extern int zlib_inflate_blocks (
-    inflate_blocks_statef *,
-    z_streamp ,
-    int);                      /* initial return code */
-
-extern void zlib_inflate_blocks_reset (
-    inflate_blocks_statef *,
-    z_streamp ,
-    uLong *);                  /* check value on output */
-
-extern int zlib_inflate_blocks_free (
-    inflate_blocks_statef *,
-    z_streamp);
-
-#if 0
-extern void zlib_inflate_set_dictionary (
-    inflate_blocks_statef *s,
-    const Byte *d,  /* dictionary */
-    uInt  n);       /* dictionary length */
-#endif  /*  0  */
-
-#if 0
-extern int zlib_inflate_blocks_sync_point (
-    inflate_blocks_statef *s);
-#endif  /*  0  */
-
-#endif /* _INFBLOCK_H */