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Fix read buffer compaction in stream filter flush #23439

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Fix read buffer compaction in stream filter flush #23439

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31 changes: 31 additions & 0 deletions ext/standard/tests/filters/stream_filter_remove_compact_read_buffer.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
--TEST--
stream_filter_remove() compacts unread data before appending flushed data
--FILE--
<?php
class ClosingSuffixFilter extends php_user_filter
{
public function filter($in, $out, &$consumed, $closing): int
{
while ($bucket = stream_bucket_make_writeable($in)) {
$consumed += $bucket->datalen;
stream_bucket_append($out, $bucket);
}
if ($closing) {
stream_bucket_append($out, stream_bucket_new($this->stream, 'END'));
}
return PSFS_PASS_ON;
}
}
stream_filter_register('closing-suffix', ClosingSuffixFilter::class);
$stream = fopen('php://memory', 'w+');
fwrite($stream, 'abcdef');
rewind($stream);
$filter = stream_filter_append($stream, 'closing-suffix', STREAM_FILTER_READ);
var_dump(fread($stream, 2));
var_dump(stream_filter_remove($filter));
var_dump(stream_get_contents($stream));
?>
--EXPECT--
string(2) "ab"
bool(true)
string(7) "cdefEND"
4 changes: 2 additions & 2 deletions main/streams/filter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -459,9 +459,9 @@ PHPAPI int _php_stream_filter_flush(php_stream_filter *filter, int finish)
/* Dump any newly flushed data to the read buffer */
if (stream->readpos > 0) {
/* Back the buffer up */
memcpy(stream->readbuf, stream->readbuf + stream->readpos, stream->writepos - stream->readpos);
stream->readpos = 0;
memmove(stream->readbuf, stream->readbuf + stream->readpos, stream->writepos - stream->readpos);
stream->writepos -= stream->readpos;
stream->readpos = 0;
}
if (flushed_size > (stream->readbuflen - stream->writepos)) {
/* Grow the buffer */
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