Make sure filters can handle an empty input buffer...

net/base/bzip2_filter.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/bzip2_filter.h"
 
 BZip2Filter::BZip2Filter(const FilterContext& filter_context)
     : Filter(filter_context),
       decoding_status_(DECODING_UNINITIALIZED),
       bzip2_data_stream_(NULL) {
@@ skipping 38 matching lines @@
   if (DECODING_DONE == decoding_status_) {
     // this logic just follow gzip_filter, which be used to deal wth some
     // server might send extra data after finish sending compress data
     return CopyOut(dest_buffer, dest_len);
   }
 
   if (decoding_status_ != DECODING_IN_PROGRESS)
     return status;
 
   // Make sure we have valid input data
-  if (!next_stream_data_ || stream_data_len_ <= 0)
-    return status;
+  if (!next_stream_data_ || stream_data_len_ <= 0) {
+    *dest_len = 0;
+    return Filter::FILTER_NEED_MORE_DATA;
+  }
 
   // Fill in bzip2 control block
   int ret, output_len = *dest_len;
   *dest_len = 0;
 
   bzip2_data_stream_->next_in = next_stream_data_;
   bzip2_data_stream_->avail_in = stream_data_len_;
   bzip2_data_stream_->next_out = dest_buffer;
   bzip2_data_stream_->avail_out = output_len;
 
@@ skipping 17 matching lines @@
       status = Filter::FILTER_NEED_MORE_DATA;
   } else if (BZ_STREAM_END == ret) {
     status = Filter::FILTER_DONE;
     decoding_status_ = DECODING_DONE;
   } else {
     decoding_status_ = DECODING_ERROR;
   }
 
   return status;
 }