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author | Przemyslaw Szczepaniak <pszczepaniak@google.com> | 2018-01-22 15:27:54 +0000 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2018-01-22 15:27:54 +0000 |
commit | 1be35eaf4dd7a9b6ccabe688923dd9d18c82c3e5 (patch) | |
tree | ea70b7e5eb48dd55db7ea6f6aa4c3ef4b3d2e1e9 | |
parent | 7bc445418678ab8fa49cf291dfb6b84a15001e3f (diff) | |
parent | e5a9c665d050612d74363a97c396845be97f6bcc (diff) | |
download | zlib-1be35eaf4dd7a9b6ccabe688923dd9d18c82c3e5.tar.gz |
Merge "Cherry-pick fix for 1.2.11 deterministic output regression"
-rw-r--r-- | src/deflate.c | 6 | ||||
-rw-r--r-- | src/zlib.h | 11 |
2 files changed, 9 insertions, 8 deletions
diff --git a/src/deflate.c b/src/deflate.c index 1ec7614..7f2c8a2 100644 --- a/src/deflate.c +++ b/src/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) { @@ -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 |