Add Resource Handler for creating Streams to forward to extensions

content/browser/streams/stream.h

 // Copyright (c) 2013 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.
 
 #ifndef CONTENT_BROWSER_STREAMS_STREAM_H_
 #define CONTENT_BROWSER_STREAMS_STREAM_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/download/byte_stream.h"
 #include "content/common/content_export.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
 class IOBuffer;
 }
 
 namespace content {
 
+class StreamHandle;
+class StreamHandleImpl;
 class StreamReadObserver;
 class StreamRegistry;
 class StreamWriteObserver;
 
 // A stream that sends data from an arbitrary source to an internal URL
 // that can be read by an internal consumer.  It will continue to pull from the
 // original URL as long as there is data available.  It can be read from
 // multiple clients, but only one can be reading at a time. This allows a
 // reader to consume part of the stream, then pass it along to another client
 // to continue processing the stream.
@@ skipping 11 matching lines @@
          const GURL& security_origin,
          const GURL& url);
 
   // Sets the reader of this stream. Returns true on success, or false if there
   // is already a reader.
   bool SetReadObserver(StreamReadObserver* observer);
 
   // Removes the read observer.  |observer| must be the current observer.
   void RemoveReadObserver(StreamReadObserver* observer);
 
+  // Removes the write observer.  |observer| must be the current observer.
+  void RemoveWriteObserver(StreamWriteObserver* observer);
+
   // Adds the data in |buffer| to the stream.  Takes ownership of |buffer|.
   void AddData(scoped_refptr<net::IOBuffer> buffer, size_t size);
 
   // Notifies this stream that it will not be receiving any more data.
   void Finalize();
 
   // Reads a maximum of |buf_size| from the stream into |buf|.  Sets
   // |*bytes_read| to the number of bytes actually read.
   // Returns STREAM_HAS_DATA if data was read, STREAM_EMPTY if no data was read,
   // and STREAM_COMPLETE if the stream is finalized and all data has been read.
   StreamState ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read);
 
+  scoped_ptr<StreamHandle> CreateHandle(const GURL& original_url,
+                                        const std::string& mime_type);
+  void CloseHandle();
+
   // Indicates whether there is space in the buffer to add more data.
   bool can_add_data() const { return can_add_data_; }
 
   const GURL& url() const { return url_; }
 
   const GURL& security_origin() const { return security_origin_; }
 
  private:
   friend class base::RefCountedThreadSafe<Stream>;
 
@@ skipping 11 matching lines @@
   scoped_refptr<net::IOBuffer> data_;
   size_t data_length_;
 
   scoped_ptr<ByteStreamWriter> writer_;
   scoped_ptr<ByteStreamReader> reader_;
 
   StreamRegistry* registry_;
   StreamReadObserver* read_observer_;
   StreamWriteObserver* write_observer_;
 
+  StreamHandleImpl* stream_handle_;
+
   base::WeakPtrFactory<Stream> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(Stream);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_STREAMS_STREAM_H_