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mbs.h

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2001-2002.  All Rights Reserved.
 * 
 * Contributor(s): 
 *          Dave Mackie       dmackie@cisco.com
 */

#ifndef __MBS_INCLUDED__
#define __MBS_INCLUDED__ 

class CMemoryBitstream {
public:
      CMemoryBitstream() {
            m_pBuf = NULL;
            m_bitPos = 0;
            m_numBits = 0;
      }

      void AllocBytes(u_int32_t numBytes);

      void SetBytes(u_int8_t* pBytes, u_int32_t numBytes);

      void PutBytes(u_int8_t* pBytes, u_int32_t numBytes);

      void PutBits(u_int32_t bits, u_int32_t numBits);

      u_int32_t GetBits(u_int32_t numBits);

      void SkipBytes(u_int32_t numBytes) {
            SkipBits(numBytes << 3);
      }

      void SkipBits(u_int32_t numBits) {
            SetBitPosition(GetBitPosition() + numBits);
      }

      u_int32_t GetBitPosition() {
            return m_bitPos;
      }

      void SetBitPosition(u_int32_t bitPos) {
            if (bitPos > m_numBits) {
                  throw;
            }
            m_bitPos = bitPos;
      }

      u_int8_t* GetBuffer() {
            return m_pBuf;
      }

      u_int32_t GetNumberOfBytes() {
            return (GetNumberOfBits() + 7) / 8;
      }

      u_int32_t GetNumberOfBits() {
            return m_numBits;
      }

protected:
      u_int8_t*   m_pBuf;
      u_int32_t   m_bitPos;
      u_int32_t   m_numBits;
};

#endif /* __MBS_INCLUDED__ */ 


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