tetrees/Plugins/Wwise/ThirdParty/include/AK/SoundEngine/Common/AkBytesMem.h

/*******************************************************************************
The content of this file includes portions of the AUDIOKINETIC Wwise Technology
released in source code form as part of the SDK installer package.

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may use this file in accordance with the end user license agreement provided 
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"Apache License"); you may not use this file except in compliance with the 
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  Copyright (c) 2023 Audiokinetic Inc.
*******************************************************************************/

// AkBytesMem.h

/// \file 
/// IReadBytes / IWriteBytes implementation on a growing memory buffer. This
/// version uses the AK::MemoryMgr allocator.

#pragma once

#include <AK/IBytes.h>
#include <AK/SoundEngine/Common/AkSoundEngineExport.h>
#include <AK/Tools/Common/AkBankReadHelpers.h>

namespace AK
{
	class ReadBytesMem
		: public AK::IReadBytes
	{
	public:

		AKSOUNDENGINE_API ReadBytesMem();
		AKSOUNDENGINE_API ReadBytesMem(
			const void * in_pBytes, 
			AkInt32 in_cBytes
			);
		AKSOUNDENGINE_API virtual ~ReadBytesMem();

		// IReadBytes implementation

		AKSOUNDENGINE_API virtual bool ReadBytes(
			void * in_pData, 
			AkInt32 in_cBytes, 
			AkInt32 & out_cRead
			);

		// Public methods

		AKSOUNDENGINE_API void Attach(
			const void * in_pBytes, 
			AkInt32 in_cBytes
			);

	private:
		AkInt32   m_cBytes;
		const AkUInt8 * m_pBytes;

		AkInt32   m_cPos;
	};

	class WriteBytesMem
		: public AK::IWriteBuffer
	{
	public:
	
		AKSOUNDENGINE_API WriteBytesMem();
		AKSOUNDENGINE_API virtual ~WriteBytesMem();
	
		// IWriteBytes implementation

		AKSOUNDENGINE_API virtual bool WriteBytes(
			const void * in_pData, 
			AkInt32 in_cBytes, 
			AkInt32& out_cWritten);
	
		// IWriteBuffer implementation

		AKSOUNDENGINE_API virtual bool Reserve(
			AkInt32 in_cBytes
			);

		AKSOUNDENGINE_API virtual AkInt32 Count() const;

		AKSOUNDENGINE_API virtual void SetCount(
			AkInt32 in_cBytes
			);

		AKSOUNDENGINE_API AkInt32 Size() const;

		AKSOUNDENGINE_API virtual AkUInt8 * Bytes() const;

		AKSOUNDENGINE_API virtual AkUInt8 * Detach();
	
		AKSOUNDENGINE_API virtual void Clear();
	
		// Public methods

		AKSOUNDENGINE_API void SetMemPool( AkMemPoolId in_pool );

		AKSOUNDENGINE_API bool HasValidMemPool();

		// Reserves space for writing in_cBytes and returns the location, advancing the write pointer.
		AkUInt8* GetWritePtr(AkInt32 in_cBytes)
		{
			AkInt32 cPos = m_cPos;
			AkInt32 cNewPos = cPos + in_cBytes;

			if ((m_cBytes >= cNewPos) || Grow(cNewPos))
			{
				m_cPos = cNewPos;
				return m_pBytes + cPos;
			}
			else
				return nullptr;
		}

		template<class T>
		T* GetWritePtr()
		{
			static_assert(alignof(T) == 1, "T must have an alignment of 1 to avoid crashes due to unaligned writes on 32-bit ARM targets. Use Write<T> instead.");
			return reinterpret_cast<T*>(GetWritePtr(sizeof(T)));
		}

		template<class T>
		bool Write(const T & in_data)
		{
			if (AkUInt8* pWrite = GetWritePtr(sizeof(T)))
			{
				AK::WriteUnaligned<T>(pWrite, in_data);
				return true;
			}
			else
				return false;
		}
	
	private:
		bool Grow(
			AkInt32 in_cBytes
		);

		AkInt32		m_cBytes;
		AkUInt8 *	m_pBytes;
	
		AkInt32	m_cPos;
	
		AkMemPoolId m_pool;
	};

	class WriteBytesBuffer
		: public AK::IWriteBytes
	{
	public:

		AKSOUNDENGINE_API WriteBytesBuffer();

		AKSOUNDENGINE_API virtual ~WriteBytesBuffer();

		AKSOUNDENGINE_API void SetBuffer(AkUInt8* in_pBytes, AkInt32 in_cSize);

		// IWriteBytes implementation

		AKSOUNDENGINE_API virtual bool WriteBytes(
			const void* in_pData,
			AkInt32 in_cBytes,
			AkInt32& out_cWritten);
		
		AKSOUNDENGINE_API AkInt32 GetPos() const;

		AKSOUNDENGINE_API void Clear();

	private:

		AkUInt8* m_pBytes;
		AkInt32 m_cSize;
		AkInt32	m_cPos;
	};
}