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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/except.h>
#include <zencore/fmtutils.h>
#include <zencore/memory/memory.h>
#include <zencore/sharedbuffer.h>
#include <zencore/testing.h>
#include <memory.h>
#include <gsl/gsl-lite.hpp>
namespace zen {
//////////////////////////////////////////////////////////////////////////
UniqueBuffer
UniqueBuffer::Alloc(uint64_t Size)
{
void* Buffer = Memory::Alloc(Size, 16);
if (!Buffer)
{
ThrowOutOfMemory(fmt::format("failed allocating {:#x} bytes aligned to {:#x}", Size, 16));
}
IoBufferCore* Owner = new IoBufferCore(Buffer, Size);
Owner->SetIsOwnedByThis(true);
Owner->SetIsImmutable(false);
return UniqueBuffer(Owner);
}
UniqueBuffer
UniqueBuffer::MakeMutableView(void* DataPtr, uint64_t Size)
{
IoBufferCore* Owner = new IoBufferCore(DataPtr, Size);
Owner->SetIsImmutable(false);
return UniqueBuffer(Owner);
}
UniqueBuffer::UniqueBuffer(IoBufferCore* Owner) : m_Buffer(Owner)
{
}
SharedBuffer
UniqueBuffer::MoveToShared()
{
return SharedBuffer(std::move(m_Buffer));
}
void
UniqueBuffer::Reset()
{
m_Buffer = nullptr;
}
//////////////////////////////////////////////////////////////////////////
SharedBuffer::SharedBuffer(UniqueBuffer&& InBuffer) : m_Buffer(std::move(InBuffer.m_Buffer))
{
}
SharedBuffer
SharedBuffer::MakeOwned() const&
{
if (IsOwned() || !m_Buffer)
{
return *this;
}
else
{
return Clone(GetView());
}
}
SharedBuffer
SharedBuffer::MakeOwned() &&
{
if (IsOwned())
{
return std::move(*this);
}
else
{
return Clone(GetView());
}
}
SharedBuffer
SharedBuffer::MakeView(MemoryView View, SharedBuffer OuterBuffer)
{
if (OuterBuffer)
{
ZEN_ASSERT(OuterBuffer.GetView().Contains(View));
}
if (View == OuterBuffer.GetView())
{
// Reference to the full buffer contents, so just return the "outer"
return OuterBuffer;
}
IoBufferCore* NewCore = new IoBufferCore(OuterBuffer.m_Buffer, View.GetData(), View.GetSize());
NewCore->SetIsImmutable(true);
return SharedBuffer(NewCore);
}
SharedBuffer
SharedBuffer::MakeView(const void* Data, uint64_t Size)
{
return SharedBuffer(new IoBufferCore(const_cast<void*>(Data), Size));
}
SharedBuffer
SharedBuffer::Clone()
{
const uint64_t Size = GetSize();
void* Buffer = Memory::Alloc(Size, 16);
if (!Buffer)
{
ThrowOutOfMemory(fmt::format("failed allocating {:#x} bytes aligned to {:#x}", Size, 16));
}
auto NewOwner = new IoBufferCore(Buffer, Size);
NewOwner->SetIsOwnedByThis(true);
memcpy(Buffer, m_Buffer->DataPointer(), Size);
return SharedBuffer(NewOwner);
}
SharedBuffer
SharedBuffer::Clone(MemoryView View)
{
const uint64_t Size = View.GetSize();
void* Buffer = Memory::Alloc(Size, 16);
if (!Buffer)
{
ThrowOutOfMemory(fmt::format("failed allocating {:#x} bytes aligned to {:#x}", Size, 16));
}
auto NewOwner = new IoBufferCore(Buffer, Size);
NewOwner->SetIsOwnedByThis(true);
memcpy(Buffer, View.GetData(), Size);
return SharedBuffer(NewOwner);
}
//////////////////////////////////////////////////////////////////////////
#if ZEN_WITH_TESTS
void
sharedbuffer_forcelink()
{
}
TEST_CASE("SharedBuffer")
{
}
#endif
} // namespace zen
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