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// Copyright 2020 The Dawn Authors
//
// 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 DAWNWIRE_CHUNKEDCOMMANDHANDLER_H_
#define DAWNWIRE_CHUNKEDCOMMANDHANDLER_H_
#include "common/Assert.h"
#include "dawn_wire/Wire.h"
#include "dawn_wire/WireCmd_autogen.h"
#include <cstdint>
#include <memory>
namespace dawn_wire {
class ChunkedCommandHandler : public CommandHandler {
public:
const volatile char* HandleCommands(const volatile char* commands, size_t size) override;
~ChunkedCommandHandler() override;
protected:
enum class ChunkedCommandsResult {
Passthrough,
Consumed,
Error,
};
// Returns |true| if the commands were entirely consumed into the chunked command vector
// and should be handled later once we receive all the command data.
// Returns |false| if commands should be handled now immediately.
ChunkedCommandsResult HandleChunkedCommands(const volatile char* commands, size_t size) {
uint64_t commandSize64 =
reinterpret_cast<const volatile CmdHeader*>(commands)->commandSize;
if (commandSize64 > std::numeric_limits<size_t>::max()) {
return ChunkedCommandsResult::Error;
}
size_t commandSize = static_cast<size_t>(commandSize64);
if (size < commandSize) {
return BeginChunkedCommandData(commands, commandSize, size);
}
return ChunkedCommandsResult::Passthrough;
}
private:
virtual const volatile char* HandleCommandsImpl(const volatile char* commands,
size_t size) = 0;
ChunkedCommandsResult BeginChunkedCommandData(const volatile char* commands,
size_t commandSize,
size_t initialSize);
size_t mChunkedCommandRemainingSize = 0;
size_t mChunkedCommandPutOffset = 0;
std::unique_ptr<char[]> mChunkedCommandData;
};
} // namespace dawn_wire
#endif // DAWNWIRE_CHUNKEDCOMMANDHANDLER_H_