fsal_read.c

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/*******************************************************************************
 *
 * Filename:
 * ---------
 * fsal_read.c
 *
 * Project:
 * --------
 *   MAUI
 *
 * Description:
 * ------------
 *   File System Abstraction Layer, read-accessing functions.
 *
 * Author:
 * -------
 * -------
 *
 *==============================================================================
 *             HISTORY
 * Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *------------------------------------------------------------------------------
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 *------------------------------------------------------------------------------
 * Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
 *==============================================================================
 *******************************************************************************/

#include "fsal.h"



FSAL_Status FSAL_Read_Bytes(STFSAL *pstFSAL, kal_uint8 *pbData, kal_uint32 uLen)
{
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
	FSAL_CHECK_ARG(pbData!=NULL);

   if((ret=FSAL_Read(pstFSAL, pbData, uLen))!=FSAL_OK) {
		return ret;
   }

	return FSAL_OK;
}



FSAL_Status FSAL_Read_Bits(STFSAL *pstFSAL, kal_uint32 *puBitCnt, kal_uint8 *pbValue, kal_uint32 uBitLen)
{
	static kal_uint8 bCurByte;
   FSAL_Status ret;
	kal_uint8 bMask;
	kal_uint32 uCurBitPos;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
   FSAL_CHECK_ARG(puBitCnt!=NULL);
   FSAL_CHECK_ARG(pbValue!=NULL);
	FSAL_ASSERT(uBitLen>=1 && uBitLen<=8);
	uCurBitPos = *puBitCnt % 8;

	if(uCurBitPos==0) {
      if((ret=FSAL_Read_Bytes(pstFSAL, &bCurByte, 1))!=FSAL_OK)
         return ret;
	}

	if(uCurBitPos+uBitLen<=8) {
		bMask = (unsigned char)((1 << (8-uCurBitPos)) - 1);
		*pbValue = (unsigned char)((bCurByte&bMask) >> (8-(uCurBitPos+uBitLen)));
	} else {
		bMask = (unsigned char)((1 << (8-uCurBitPos)) - 1);
		*pbValue = (unsigned char)((bCurByte&bMask) << (uBitLen-(8-uCurBitPos)));
      if((ret=FSAL_Read_Bytes(pstFSAL, &bCurByte, 1))!=FSAL_OK)
         return ret;
		*pbValue |= bCurByte>>(16-uBitLen-uCurBitPos);
	}
	*puBitCnt += uBitLen;

	return FSAL_OK;
}



FSAL_Status FSAL_Read_UINT(STFSAL *pstFSAL, kal_uint32 *puValue)
{
	kal_uint8 data[4];
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
	FSAL_CHECK_ARG(puValue!=NULL);

   if((ret=FSAL_Read_Bytes(pstFSAL, data, 4))!=FSAL_OK)
      return ret;

	*puValue = (kal_uint32)((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + (data[3]));

	return FSAL_OK;
}



FSAL_Status FSAL_Read_UINT24(STFSAL *pstFSAL, kal_uint32 *puValue)
{
	kal_uint8 data[3];
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
	FSAL_CHECK_ARG(puValue!=NULL);

   if((ret=FSAL_Read_Bytes(pstFSAL, data, 3))!=FSAL_OK)
      return ret;

	*puValue = (kal_uint32)((data[0]<<16) + (data[1]<<8) + (data[2]));

	return FSAL_OK;
}



FSAL_Status FSAL_Read_UINT16(STFSAL *pstFSAL, kal_uint16 *pwValue)
{
	kal_uint8 data[2];
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
	FSAL_CHECK_ARG(pwValue!=NULL);

   if((ret=FSAL_Read_Bytes(pstFSAL, data, 2))!=FSAL_OK)
      return ret;

	*pwValue = (kal_uint16)((data[0]<<8) + (data[1]));

	return FSAL_OK;
}



FSAL_Status FSAL_Skip_Bytes(STFSAL *pstFSAL, kal_uint32 uLen)
{
   kal_uint32 uCurPos;
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);

   if ((ret=FSAL_GetCurPos(pstFSAL, &uCurPos))!=FSAL_OK)
      return ret;

   if ((ret=FSAL_Seek(pstFSAL, uCurPos+uLen))!=FSAL_OK)
      return ret;

	return FSAL_OK;
}


FSAL_Status FSAL_Peek_Bytes(STFSAL *pstFSAL, kal_uint8 *pbValue, kal_uint32 uLen)
{
   kal_uint32 uCurPos;
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
   FSAL_CHECK_ARG(pbValue!=NULL);

   if ((ret=FSAL_GetCurPos(pstFSAL, &uCurPos))!=FSAL_OK)
      return ret;

   if ((ret=FSAL_Read_Bytes(pstFSAL, pbValue, uLen))!=FSAL_OK)
      return ret;

   if ((ret=FSAL_Seek(pstFSAL, uCurPos))!=FSAL_OK)
      return ret;

	return FSAL_OK;
}



FSAL_Status FSAL_Peek_UINT(STFSAL *pstFSAL, kal_uint32 *puValue)
{
   kal_uint32 uCurPos;
   FSAL_Status ret;

   FSAL_CHECK_ARG(pstFSAL!=NULL);
   FSAL_CHECK_ARG(puValue!=NULL);

   if ((ret=FSAL_GetCurPos(pstFSAL, &uCurPos))!=FSAL_OK)
      return ret;
   
	if((ret=FSAL_Read_UINT(pstFSAL, puValue))!=FSAL_OK)
		return ret;
   
   if((ret=FSAL_Seek(pstFSAL, uCurPos))!=FSAL_OK) 
      return ret;

	return FSAL_OK;
}