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/*
* bitbuffer.c: TODO(short description)
*
* See the README file for copyright information and how to reach the author.
*
* $Id: bitbuffer.c 1.1 2009/12/29 14:29:20 kls Exp $
*/
#include "bitbuffer.h"
#include <stdlib.h>
cBitBuffer::cBitBuffer(uint32_t MaxLength)
{
mData = NULL;
mMaxLength = 0;
mBitPos = 0;
if (MaxLength <= 0x10000)
{
mData = new uint8_t[MaxLength];
if (mData)
{
mMaxLength = MaxLength * 8;
}
}
}
cBitBuffer::~cBitBuffer(void)
{
if (mData)
delete[] mData;
}
uint8_t * cBitBuffer::GetData(void)
{
return mData;
}
uint32_t cBitBuffer::GetMaxLength(void)
{
return mMaxLength / 8;
}
uint32_t cBitBuffer::GetBits(int NumBits)
{
return 0;
}
void cBitBuffer::SetBits(int NumBits, uint32_t Data)
{
uint32_t nextBitPos;
uint32_t bytePos;
uint32_t bitsInByte;
int shift;
if (NumBits <= 0 || NumBits > 32)
return;
nextBitPos = mBitPos + NumBits;
if (nextBitPos > mMaxLength)
return;
bytePos = mBitPos / 8;
bitsInByte = mBitPos % 8;
mData[bytePos] &= (uint8_t) (0xFF << (8 - bitsInByte));
shift = NumBits - (8 - bitsInByte);
if (shift > 0)
mData[bytePos] |= (uint8_t) (Data >> shift);
else
mData[bytePos] |= (uint8_t) (Data << (-shift));
NumBits -= 8 - bitsInByte;
bytePos++;
while (NumBits > 0)
{
shift = NumBits - 8;
if (shift > 0)
mData[bytePos] = (uint8_t) (Data >> shift);
else
mData[bytePos] = (uint8_t) (Data << (-shift));
NumBits -= 8;
bytePos++;
}
mBitPos = nextBitPos;
}
uint32_t cBitBuffer::GetByteLength(void)
{
return (mBitPos + 7) / 8;
}
void cBitBuffer::SetDataByte(uint32_t Position, uint8_t Data)
{
if (Position < mMaxLength)
mData[Position] = Data;
}
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