Intel Extensible Firmware Interface - Manual (Page 998)

Extensible Firmware Interface Specification
I-6 12/01/02 Version 1.10
//
// Get 1 byte into SubBitBuf
//
Sd->mCompSize --;
Sd->mSubBitBuf = 0;
Sd->mSubBitBuf = Sd->mSrcBase[Sd->mInBuf ++];
Sd->mBitCount = 8;
} else {
Sd->mSubBitBuf = 0;
Sd->mBitCount = 8;
}
}
Sd->mBitCount = (UINT16)(Sd->mBitCount - NumOfBits);
Sd->mBitBuf |= Sd->mSubBitBuf >> Sd->mBitCount;
}
STATIC
UINT16
GetBits(
IN SCRATCH_DATA *Sd,
IN UINT16 NumOfBits
)
/*++
Routine Description:
Get NumOfBits of bits out from mBitBuf. Fill mBitBuf with subsequent
NumOfBits of bits from source. Returns NumOfBits of bits that are
popped out.
Arguments:
Sd - The global scratch data.
NumOfBits - The number of bits to pop and read.
Returns:
The bits that are popped out.
--*/
{
UINT16 OutBits;
OutBits = (UINT16)(Sd->mBitBuf >> (BITBUFSIZ - NumOfBits));
FillBuf (Sd, NumOfBits);
return OutBits;
}