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// Copyright 2020 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef SRC_DAWN_WIRE_CHUNKEDCOMMANDHANDLER_H_
#define SRC_DAWN_WIRE_CHUNKEDCOMMANDHANDLER_H_
#include <cstdint>
#include <limits>
#include <memory>
#include "dawn/common/Assert.h"
#include "dawn/wire/Wire.h"
#include "dawn/wire/WireCmd_autogen.h"
namespace dawn::wire {
class ChunkedCommandHandler : public CommandHandler {
public:
ChunkedCommandHandler();
~ChunkedCommandHandler() override;
const volatile char* HandleCommands(const volatile char* commands, size_t size) 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 // SRC_DAWN_WIRE_CHUNKEDCOMMANDHANDLER_H_