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#include "PxcNpCacheStreamPair.h"
#include "PsUserAllocated.h"
#include "PxcNpMemBlockPool.h"

using namespace physx;

void PxcNpCacheStreamPair::reset()
{
	mBlock = NULL;
	mUsed = 0;
}

PxcNpCacheStreamPair::PxcNpCacheStreamPair(PxcNpMemBlockPool& blockPool):
  mBlockPool(blockPool), mBlock(NULL), mUsed(0)
{
}

// reserve can fail and return null. Read should never fail
PxU8* PxcNpCacheStreamPair::reserve(PxU32 size)
{
	size = (size+15)&~15;

	if(size>PxcNpMemBlock::SIZE)
	{
		return reinterpret_cast<PxU8*>(-1);
	}

	if(mBlock == NULL || mUsed + size > PxcNpMemBlock::SIZE)
	{
		mBlock = mBlockPool.acquireNpCacheBlock();
		mUsed = 0;
	}

	PxU8* ptr;
	if(mBlock == NULL)
		ptr = 0;
	else
	{
		ptr = mBlock->data+mUsed;
		mUsed += size;
	}

	return ptr;
}