Remove x86_check_features() from inflate

adler32 can be freely called like crc32, per the "zlib.h" docs
so move the x86 feature check there, which allows us to remove
x86_check_features() from zlib inflate. Note inflate() calls

  adler32(0, Z_NULL, 0);

(once only) before using the zlib adler32() routine. A reading
from third_party/libpng png.c

  2324:  /* Now calculate the adler32 if not done already. */
  2327:     adler = adler32(0, NULL, 0);
  2328:     adler = adler32(adler, profile, length);

suggests they also conform to the "zlib.h" doc rules about use
of the adler32 routine.

Bug: 762564
Change-Id: Id84da0eb52bc10edb541a284eab9aef652ba2c72
Reviewed-on: https://chromium-review.googlesource.com/901043
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#534964}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c376937e3709ddef4b97621a58039a21b67faa6e

1 files changed, 0 insertions, 3 deletions

diff --git a/inflate.c b/inflate.c
index e84be46..5c40cf1 100644
--- a/inflate.c
+++ b/inflate.c
@@ -84,7 +84,6 @@
 #include "inftrees.h"
 #include "inflate.h"
 #include "inffast.h"
-#include "x86.h"
 
 #ifdef MAKEFIXED
 #  ifndef BUILDFIXED
@@ -202,8 +201,6 @@ int stream_size;
     int ret;
     struct inflate_state FAR *state;
 
-    x86_check_features();
-
     if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
         stream_size != (int)(sizeof(z_stream)))
         return Z_VERSION_ERROR;