sys-libs/zlib: Fix deflateParams() usage (bug #631550)

Package-Manager: Portage-2.3.8, Repoman-2.3.3

1 files changed, 67 insertions, 0 deletions

diff --git a/sys-libs/zlib/files/zlib-1.2.11-fix-deflateParams-usage.patch b/sys-libs/zlib/files/zlib-1.2.11-fix-deflateParams-usage.patch
new file mode 100644
index 000000000000..18764849b945
--- /dev/null
+++ b/sys-libs/zlib/files/zlib-1.2.11-fix-deflateParams-usage.patch
@@ -0,0 +1,67 @@
+From f9694097dd69354b03cb8af959094c7f260db0a1 Mon Sep 17 00:00:00 2001
+From: Mark Adler <madler@alumni.caltech.edu>
+Date: Mon, 16 Jan 2017 09:49:35 -0800
+Subject: [PATCH] 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.
+---
+ deflate.c |  6 +++---
+ zlib.h    | 11 ++++++-----
+ 2 files changed, 9 insertions(+), 8 deletions(-)
+
+diff --git a/deflate.c b/deflate.c
+index b63311a5..20bda4f6 100644
+--- a/deflate.c
++++ b/deflate.c
+@@ -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) {
+diff --git a/zlib.h b/zlib.h
+index 5daf4f28..577d81e3 100644
+--- a/zlib.h
++++ b/zlib.h
+@@ -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