Return LZMA_STREAM_END instead of LZMA_OK if

LZMA_SYNC_FLUSH or LZMA_FULL_FLUSH is used when
there's no unfinished Block open.

diff --git a/src/liblzma/common/stream_encoder_multi.c b/src/liblzma/common/stream_encoder_multi.c
index 33b4efd..403980c 100644 (file)
--- a/src/liblzma/common/stream_encoder_multi.c
+++ b/src/liblzma/common/stream_encoder_multi.c
@@ -276,8 +276,12 @@ stream_encode(lzma_coder *coder, lzma_allocator *allocator,
                // Don't create an empty Block unless it would be
                // the only Data Block.
                if (*in_pos == in_size) {
+                       // If we are LZMA_SYNC_FLUSHing or LZMA_FULL_FLUSHing,
+                       // return LZMA_STREAM_END since there's nothing to
+                       // flush.
                        if (action != LZMA_FINISH)
-                               return LZMA_OK;
+                               return action == LZMA_RUN
+                                       ? LZMA_OK : LZMA_STREAM_END;
 
                        if (lzma_info_index_count_get(coder->info) != 0) {
                                if (lzma_info_index_finish(coder->info))