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63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_WEBSOCKETS_WEBSOCKET_DEFLATE_PREDICTOR_H_
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#define NET_WEBSOCKETS_WEBSOCKET_DEFLATE_PREDICTOR_H_
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#include <stddef.h>
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#include <memory>
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#include <vector>
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#include "net/base/net_export.h"
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namespace net {
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struct WebSocketFrame;
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// WebSocketDeflatePredictor is an interface class used for judging whether
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// a WebSocketDeflateStream should compress a message or not.
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class NET_EXPORT_PRIVATE WebSocketDeflatePredictor {
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public:
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enum Result {
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// Deflate and send the message.
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DEFLATE,
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// Do not deflate and send the original message.
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DO_NOT_DEFLATE,
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// Try compressing the message and send the smaller one of the original
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// and the compressed message.
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// Returning this result implies that the deflater is running on
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// DoNotTakeOverContext mode and the entire message is visible.
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TRY_DEFLATE,
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};
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virtual ~WebSocketDeflatePredictor() {}
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// Predicts and returns whether the deflater should deflate the message
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// which begins with |frames[frame_index]| or not.
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// |frames[(frame_index + 1):]| consists of future frames if any.
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// |frames[frame_index]| must be the first frame of a data message,
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// but future frames may contain control message frames.
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// |frames[frame_index]| cannot be recorded yet and all preceding
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// data frames have to be already recorded when this method is called.
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virtual Result Predict(
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const std::vector<std::unique_ptr<WebSocketFrame>>& frames,
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size_t frame_index) = 0;
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// Records frame data for future prediction.
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// Only data frames should be recorded. Do not pass control frames' data.
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// All input data frames for the stream must be recorded in order.
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virtual void RecordInputDataFrame(const WebSocketFrame* frame) = 0;
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// Records frame data for future prediction.
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// Only data frames should be recorded. Do not pass control frames' data.
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// All data frames written by the stream must be recorded in order
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// regardless of whether they are compressed or not.
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virtual void RecordWrittenDataFrame(const WebSocketFrame* frame) = 0;
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};
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} // namespace net
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#endif // NET_WEBSOCKETS_WEBSOCKET_DEFLATE_PREDICTOR_H_
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