svn commit: r323381 - vendor/zlib/dist

[Marius Strobl]

Author: marius
Date: Sun Sep 10 00:56:28 2017
New Revision: 323381
URL: https://svnweb.freebsd.org/changeset/base/323381

Log:
  Permit a deflateParams() parameter change as soon as possible.
  
  This commit allows a parameter change even if the input data has
  not all been compressed and copied to the application output
  buffer, so long as all of the input data has been compressed to
  the internal pending output buffer. This also allows an immediate
  deflateParams change so long as there have been no deflate calls
  since initialization or reset.
  
  Obtained from:	upstream (f9694097dd69354b03cb8af959094c7f260db0a1)

Modified:
  vendor/zlib/dist/deflate.c
  vendor/zlib/dist/zlib.h

Modified: vendor/zlib/dist/deflate.c
==============================================================================
--- vendor/zlib/dist/deflate.c	Sat Sep  9 22:02:36 2017	(r323380)
+++ vendor/zlib/dist/deflate.c	Sun Sep 10 00:56:28 2017	(r323381)
@@ -494,7 +494,7 @@ int ZEXPORT deflateResetKeep (strm)
         s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
 #endif
         adler32(0L, Z_NULL, 0);
-    s->last_flush = Z_NO_FLUSH;
+    s->last_flush = -2;
 
     _tr_init(s);
 
@@ -587,12 +587,12 @@ int ZEXPORT deflateParams(strm, level, strategy)
     func = configuration_table[s->level].func;
 
     if ((strategy != s->strategy || func != configuration_table[level].func) &&
-        s->high_water) {
+        s->last_flush != -2) {
         /* Flush the last buffer: */
         int err = deflate(strm, Z_BLOCK);
         if (err == Z_STREAM_ERROR)
             return err;
-        if (strm->avail_out == 0)
+        if (strm->avail_in || (s->strstart - s->block_start) + s->lookahead)
             return Z_BUF_ERROR;
     }
     if (s->level != level) {

Modified: vendor/zlib/dist/zlib.h
==============================================================================
--- vendor/zlib/dist/zlib.h	Sat Sep  9 22:02:36 2017	(r323380)
+++ vendor/zlib/dist/zlib.h	Sun Sep 10 00:56:28 2017	(r323381)
@@ -712,11 +712,12 @@ ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
    used to switch between compression and straight copy of the input data, or
    to switch to a different kind of input data requiring a different strategy.
    If the compression approach (which is a function of the level) or the
-   strategy is changed, and if any input has been consumed in a previous
-   deflate() call, then the input available so far is compressed with the old
-   level and strategy using deflate(strm, Z_BLOCK).  There are three approaches
-   for the compression levels 0, 1..3, and 4..9 respectively.  The new level
-   and strategy will take effect at the next call of deflate().
+   strategy is changed, and if there have been any deflate() calls since the
+   state was initialized or reset, then the input available so far is
+   compressed with the old level and strategy using deflate(strm, Z_BLOCK).
+   There are three approaches for the compression levels 0, 1..3, and 4..9
+   respectively.  The new level and strategy will take effect at the next call
+   of deflate().
 
      If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
    not have enough output space to complete, then the parameter change will not