http_value.h

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/*
 * Copyright 2010 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_HTTP_VALUE_H_
#define NET_INSTAWEB_HTTP_PUBLIC_HTTP_VALUE_H_

#include <cstddef>                     

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/shared_string.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/writer.h"

namespace net_instaweb {

class ResponseHeaders;
class MessageHandler;

class HTTPValue : public Writer {
 public:
  HTTPValue() : contents_size_(0) {}

  void Clear();

  bool Empty() const { return storage_.empty(); }

  void SetHeaders(ResponseHeaders* headers);

  virtual bool Write(const StringPiece& str, MessageHandler* handler);
  virtual bool Flush(MessageHandler* handler);

  bool ExtractHeaders(ResponseHeaders* headers, MessageHandler* handler) const;

  bool ExtractContents(StringPiece* str) const;

  bool unique() const { return storage_.unique(); }

  bool Link(const SharedString& src, ResponseHeaders* headers,
            MessageHandler* handler);

  void Link(HTTPValue* src) {
    if (src != this) {
      storage_ = src->storage_; 
      contents_size_ = src->contents_size();
    }
  }

  const SharedString& share() const { return storage_; }

  size_t size() const { return storage_.size(); }
  int64 contents_size() { return contents_size_; }

  static bool Decode(StringPiece encoded_value, GoogleString* http_string,
                     MessageHandler* handler);
  static bool Encode(StringPiece http_string, GoogleString* encoded_value,
                     MessageHandler* handler);

 private:
  friend class HTTPValueTest;

  char type_identifier() const { return *storage_.data(); }

  unsigned int SizeOfFirstChunk() const;
  void SetSizeOfFirstChunk(unsigned int size);
  int64 ComputeContentsSize() const;

  void CopyOnWrite();

  SharedString storage_;
  int64 contents_size_;

  
};

}  

#endif