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20e75329f2
When `php_zlib_deflate_filter()` is called with `PSFS_FLAG_FLUSH_INC` but without new buckets being available (e.g. because a user calls `rewind()` after writing to the stream), we have to make sure that any pending data are flushed. This could basically be done like in the attached patch[1], but that could cause unnessary flushes, which can be harmful for compression, and adds unnecessary flush markers to the stream. Thus, we use the `php_zlib_filter_data.finished` field, which has not been used for `zlib.deflate` filters, and properly keep track of the need to flush. [1] <https://bugs.php.net/patch-display.php?bug_id=48725&patch=zlib-filter-flush-fix.patch&revision=latest> Closes GH-6019.