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From f1b8edadc3c733990f8a8de4d643f968e571ae85 Mon Sep 17 00:00:00 2001
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From: Adam Tkac <atkac@redhat.com>
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Date: Fri, 17 Aug 2012 15:13:48 +0200
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Subject: [PATCH] Rank Z_BLOCK flush below Z_PARTIAL_FLUSH only when last
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flush was Z_BLOCK.
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This fixes regression introduced by f1ebdd6a9c495a5db9a22aa80dd7d54ae7db42e9
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(Permit stronger flushes after Z_BLOCK flushes.). Now this code is valid
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again:
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deflate(stream, Z_SYNC_FLUSH);
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deflateParams(stream, newLevel, Z_DEFAULT_STRATEGY);
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Signed-off-by: Adam Tkac <atkac@redhat.com>
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---
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deflate.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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diff --git a/deflate.c b/deflate.c
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index 9e4c2cb..3422f72 100644
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--- a/deflate.c
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+++ b/deflate.c
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@@ -882,9 +882,16 @@ int ZEXPORT deflate (strm, flush)
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* flushes. For repeated and useless calls with Z_FINISH, we keep
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* returning Z_STREAM_END instead of Z_BUF_ERROR.
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*/
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- } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
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- flush != Z_FINISH) {
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- ERR_RETURN(strm, Z_BUF_ERROR);
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+ } else if (strm->avail_in == 0 && flush != Z_FINISH) {
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+ char err;
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+
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+ /* Degrade Z_BLOCK only when last flush was Z_BLOCK */
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+ err = (old_flush == Z_BLOCK) ?
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+ RANK(flush) <= RANK(old_flush) : flush <= old_flush;
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+
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+ if (err) {
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+ ERR_RETURN(strm, Z_BUF_ERROR);
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+ }
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}
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/* User must not provide more input after the first FINISH: */
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--
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1.7.11.4
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