/************
*
*   This file is part of a tool for reading 3D content in the PRC format.
*   Copyright (C) 2008 Orest Shardt <shardtor (at) gmail dot com>
*
*   This program is free software: you can redistribute it and/or modify
*   it under the terms of the GNU Lesser General Public License as published by
*   the Free Software Foundation, either version 3 of the License, 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 Lesser General Public License for more details.
*
*   You should have received a copy of the GNU Lesser General Public License
*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*************/

#ifndef __BITDATA_H
#define __BITDATA_H

#include <iostream>
#include <string>

struct BitPosition
{
 unsigned int byteIndex;
 unsigned int bitIndex;
};

class BitByBitData
{
 public:
   BitByBitData(char* s,unsigned int l) : start(s),data(s),length(l),
                bitMask(0x80),showBits(false),failed(false) {}

   void tellPosition();
   BitPosition getPosition();
   void setPosition(const BitPosition&);
   void setPosition(unsigned int,unsigned int);
   void setShowBits(bool);
   bool readBit();
   unsigned char readChar();

   unsigned int readUnsignedInt();
   std::string readString();
   int readInt();
   double readDouble();

 private:
   char *start;  // first byte so we know where we are
   char *data;    // last byte read
   unsigned int length;
   unsigned char bitMask;  // mask to read next bit of current byte
   bool showBits; // show each bit read?
   bool failed;
   void nextBit(); // shift bit mask and get next byte if needed
};

#endif // __BITDATA_H