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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_WEBSOCKETS_WEBSOCKET_CHUNK_ASSEMBLER_H_
#define NET_WEBSOCKETS_WEBSOCKET_CHUNK_ASSEMBLER_H_
#include <memory>
#include <vector>
#include "base/types/expected.h"
#include "net/base/net_errors.h"
#include "net/websockets/websocket_frame.h"
namespace net {
class NET_EXPORT WebSocketChunkAssembler final {
public:
WebSocketChunkAssembler();
~WebSocketChunkAssembler();
// Resets the current state of the assembler.
void Reset();
// Processes a WebSocket frame chunk and assembles it into a complete frame.
// Returns either the assembled frame or an error code.
base::expected<std::unique_ptr<WebSocketFrame>, net::Error> HandleChunk(
std::unique_ptr<WebSocketFrameChunk> chunk);
private:
// Enum representing the current state of the assembler.
enum class AssemblyState {
kMessageFinished, // Message finished, ready for next frame.
kInitialFrame, // Processing the first frame.
kContinuationFrame, // Processing continuation frame.
kControlFrame // Processing control frame.
};
// Current state of the assembler
AssemblyState state_ = AssemblyState::kMessageFinished;
std::unique_ptr<WebSocketFrameHeader> current_frame_header_;
std::vector<char> chunk_buffer_;
};
} // namespace net
#endif // NET_WEBSOCKETS_WEBSOCKET_CHUNK_ASSEMBLER_H_
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