core/ASCImageStudio3/ASCImageJpeg2000/Raw.h

#pragma once

#include "Types.h"
#include "Utils.h"

//-------------------------------------------------------------------------------------------------------------------------------
Raw* Raw_Create() 
{
	Raw *pRaw = (Raw*)Malloc(HEAP_ZERO_MEMORY,  sizeof(Raw) );
	return pRaw;
}

void Raw_Destroy(Raw *pRaw) 
{
	RELEASEHEAP( pRaw );
}

int  Raw_BytesCount(Raw *pRaw) 
{
	return pRaw->pBufferPointer - pRaw->pBufferStart;
}

void Raw_InitDecoder(Raw *pRaw, unsigned char *pBuffer, int nLen) 
{
	pRaw->pBufferStart   = pBuffer;
	pRaw->nMaxLen        = nLen;
	pRaw->nLen           = 0;
	pRaw->nBuffer        = 0;
	pRaw->nFreeBitsCount = 0;
}

int  Raw_Decode(Raw *pRaw) 
{
	if ( pRaw->nFreeBitsCount == 0 ) 
	{
		pRaw->nFreeBitsCount = 8;
		if ( pRaw->nLen == pRaw->nMaxLen ) 
		{
			pRaw->nBuffer = 0xff;
		} 
		else 
		{
			if ( pRaw->nBuffer == 0xff ) 
			{
				pRaw->nFreeBitsCount = 7;
			}
			pRaw->nBuffer = *(pRaw->pBufferStart + pRaw->nLen);
			pRaw->nLen++;
		}
	}
	pRaw->nFreeBitsCount--;
	int nResult = (pRaw->nBuffer >> pRaw->nFreeBitsCount) & 0x01;
	
	return nResult;
}