inflating_fetch.h

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/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef NET_INSTAWEB_HTTP_PUBLIC_INFLATING_FETCH_H_
#define NET_INSTAWEB_HTTP_PUBLIC_INFLATING_FETCH_H_

#include "net/instaweb/http/public/async_fetch.h"
#include "net/instaweb/http/public/http_value.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/http/response_headers.h"
#include "pagespeed/kernel/util/gzip_inflater.h"

namespace net_instaweb {

class MessageHandler;

class InflatingFetch : public SharedAsyncFetch {
 public:
  explicit InflatingFetch(AsyncFetch* fetch);
  virtual ~InflatingFetch();

  void EnableGzipFromBackend();

  static bool UnGzipValueIfCompressed(const HTTPValue& src,
                                      ResponseHeaders* headers,
                                      HTTPValue* dest,
                                      MessageHandler* handler);
  static bool GzipValue(int compression_level, const HTTPValue& http_value,
                        HTTPValue* compressed_value, ResponseHeaders* headers,
                        MessageHandler* handler);

 protected:
  virtual bool HandleWrite(const StringPiece& sp, MessageHandler* handler);

  virtual void HandleHeadersComplete();
  virtual void HandleDone(bool success);
  virtual void Reset();

 private:
  void InitInflater(GzipInflater::InflateType, const StringPiece& value);

  bool IsCompressionAllowedInRequest();

  scoped_ptr<GzipInflater> inflater_;

  bool request_checked_for_accept_encoding_;

  bool compression_desired_;

  bool inflate_failure_;

  
};

}  

#endif