src/dawn/wire/client/ClientInlineMemoryTransferService.cpp

// Copyright 2019 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.
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// 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
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#include <cstring>
#include <memory>
#include <new>
#include <utility>

#include "dawn/wire/WireClient.h"
#include "src/dawn/wire/client/Client.h"
#include "src/utils/assert.h"
#include "src/utils/compiler.h"
#include "src/utils/heap_array.h"

namespace dawn::wire::client {

class InlineMemoryTransferService : public MemoryTransferService {
    class MemoryHandleImpl : public MemoryHandle {
      public:
        explicit MemoryHandleImpl(HeapArray<std::byte> stagingData)
            : mStagingData(std::move(stagingData)) {
            DAWN_ASSERT(mStagingData);
        }

        ~MemoryHandleImpl() override = default;

        size_t GetSerializeCreateSize() const override { return 0; }
        void SerializeCreate(std::span<std::byte> serializeSpace) const override {
            DAWN_ASSERT(serializeSpace.size() == GetSerializeCreateSize());
        }

        std::span<std::byte> GetData() const override { return mStagingData; }

        size_t GetSerializeDataUpdateSize(size_t offset, size_t size) const override {
            DAWN_ASSERT(offset <= mStagingData.size());
            DAWN_ASSERT(size <= mStagingData.size() - offset);
            return size;
        }

        void SerializeDataUpdate(std::span<std::byte> serializeData,
                                 size_t offset,
                                 size_t size) const override {
            DAWN_ASSERT(serializeData.size() == GetSerializeDataUpdateSize(offset, size));
            DAWN_ASSERT(offset <= mStagingData.size());
            DAWN_ASSERT(size <= mStagingData.size() - offset);

            auto src = GetData().subspan(offset, serializeData.size());
            std::ranges::copy(src, serializeData.begin());
        }

        bool DeserializeDataUpdate(std::span<const std::byte> deserializeData,
                                   size_t offset,
                                   size_t size) override {
            if (offset > mStagingData.size() ||
                deserializeData.size() > mStagingData.size() - offset) {
                return false;
            }

            std::ranges::copy(deserializeData, GetData().begin() + offset);
            return true;
        }

      private:
        HeapArray<std::byte> mStagingData;
    };

  public:
    InlineMemoryTransferService() {}
    ~InlineMemoryTransferService() override = default;

    std::unique_ptr<MemoryHandle> CreateMemoryHandle(size_t size) override {
        auto stagingData = HeapArray<std::byte>(size, std::nothrow);
        if (!stagingData) {
            return nullptr;
        }

        return std::make_unique<MemoryHandleImpl>(std::move(stagingData));
    }
};

std::unique_ptr<MemoryTransferService> CreateInlineMemoryTransferService() {
    return std::make_unique<InlineMemoryTransferService>();
}

}  // namespace dawn::wire::client