src/dawn/wire/ChunkedCommandSerializer.cpp

// Copyright 2020 The Dawn & Tint Authors
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#include "src/dawn/wire/ChunkedCommandSerializer.h"

#include "src/utils/assert.h"
#include "src/utils/compiler.h"

namespace dawn::wire {

ChunkedCommandSerializer::ChunkedCommandSerializer(CommandSerializer* serializer)
    : mSerializer(serializer), mMaxAllocationSize(serializer->GetMaximumAllocationSize()) {
    DAWN_ASSERT(mMaxAllocationSize > 0);
}

void ChunkedCommandSerializer::SetCommandSerializerForDisconnect(CommandSerializer* serializer) {
    mSerializer = serializer;
    mMaxAllocationSize = serializer->GetMaximumAllocationSize();
    DAWN_ASSERT(mMaxAllocationSize > 0);
}

void ChunkedCommandSerializer::Flush() {
    mSerializer->Flush();
}

void ChunkedCommandSerializer::SerializeChunkedCommand(Span<const std::byte> allocatedBuffer) {
    // Constant regarding the size of the WireChunkedCommandCmd that can be computed once.
    static size_t kWireChunkedCmdPrefixSize = ChunkedCommandCmd{0, 0, nullptr, 0}.GetRequiredSize();

    // TODO(https://crbug.com/528027992): Spanify the ChunkedCommandCmd struct.
    ChunkedCommandCmd cmd;
    cmd.id = mNextChunkedCommandId++;
    cmd.size = allocatedBuffer.size();

    while (!allocatedBuffer.empty()) {
        cmd.chunkData = reinterpret_cast<const char*>(allocatedBuffer.data());
        cmd.chunkSize =
            std::min(allocatedBuffer.size(), mMaxAllocationSize - kWireChunkedCmdPrefixSize);
        DAWN_ASSERT(cmd.GetRequiredSize() <= mMaxAllocationSize);

        SerializeCommand(cmd);
        allocatedBuffer = allocatedBuffer.subspan(cmd.chunkSize);
    }
}

}  // namespace dawn::wire