Intel Extensible Firmware Interface - Manual (Page 987)

Compression Source Code
Version 1.10 12/01/02 H-23
Routine Description:
Outputs rightmost n bits of x
Argments:
n - the rightmost n bits of the data is used
x - the data
Returns: (VOID)
--*/
{
UINT8 Temp;
if (n < mBitCount) {
mSubBitBuf |= x << (mBitCount -= n);
} else {
Temp = (UINT8)(mSubBitBuf | (x >> (n -= mBitCount)));
if (mDst < mDstUpperLimit) {
*mDst++ = Temp;
}
mCompSize++;
if (n < UINT8_BIT) {
mSubBitBuf = x << (mBitCount = UINT8_BIT - n);
} else {
Temp = (UINT8)(x >> (n - UINT8_BIT));
if (mDst < mDstUpperLimit) {
*mDst++ = Temp;
}
mCompSize++;
mSubBitBuf = x << (mBitCount = 2 * UINT8_BIT - n);
}
}
}
STATIC
INT32
FreadCrc (
OUT UINT8 *p,
IN INT32 n
)
/*++
Routine Description:
Read in source data
Arguments:
p - the buffer to hold the data
n - number of bytes to read