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/*
* Copyright (C) 2011 Hendrik Leppkes
* http://www.1f0.de
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* Initial design and concept by Gabest and the MPC-HC Team, copyright under GPLv2
*/
#pragma once
/**
* Byte Parser Utility Class
*/
class CByteParser
{
public:
/** Construct a Byte Parser to parse the given BYTE array with the given length */
CByteParser(const BYTE *pData, uint32_t length);
virtual ~CByteParser();
/** Read 1 to 32 Bits from the Byte Array. If peek is set, the data will just be returned, and the buffer not advanced. */
uint32_t BitRead(uint8_t numBits, bool peek = false);
/** Read a unsigned number in Exponential Golomb encoding (with k = 0) */
uint64_t UExpGolombRead();
/** Read a signed number in Exponential Golomb encoding (with k = 0) */
int64_t SExpGolombRead();
/** Seek to the position (in bytes) in the byte array */
void Seek(DWORD pos);
/** Pointer to the start of the byte array */
const BYTE *Start() const { return m_pData; }
/** Pointer to the end of the byte array */
const BYTE *End() const { return m_pEnd; }
/** Overall length (in bytes) of the byte array */
uint32_t Length() const { return m_dwLen; }
/** Current byte position in the array. Any incomplete bytes ( buffer < 8 bits ) will not be counted */
uint32_t Pos() const { return uint32_t(m_pCurrent - m_pData) - (m_bitLen>>3); }
/** Number of bytes remaining in the array */
uint32_t Remaining() const { return Length() - Pos(); }
/** Flush any bits currently in the buffer */
void BitFlush() { m_bitLen = 0; m_bitBuffer = 0; }
/** Skip bits until the next byte border */
void BitByteAlign() { BitRead(m_bitLen & 7); }
private:
// Pointer to the start of the data buffer
const BYTE * const m_pData;
// Pointer to the current position in the data buffer
const BYTE *m_pCurrent;
// Pointer to the end in the data buffer
const BYTE * const m_pEnd;
const uint32_t m_dwLen;
uint64_t m_bitBuffer;
uint8_t m_bitLen;
};
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