QvdFile.h

/*
 * Copyright (c) 2017 Devin Smith <devin@devinsmith.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef __QVDFILE_H__
#define __QVDFILE_H__

#ifdef DEBUG_BUILD
#define DEBUG(x) do { x } while (0)
#else
#define DEBUG(x)
#endif

#include <cstdio>
#include <string>
#include <vector>

#include "LineageInfo.h"
#include "QvdField.h"
#include "QvdTableHeader.h"

class QvdFile {
public:
  QvdFile() : _lastFieldIndex(0), _fp(NULL),
    _dataPtrStart(NULL), _bufLen(0), _eof(false), _bitBuffer(0),
    _bitBufferSz(0) {}
  bool Load(const char *filename);

  size_t NumFields() { return _hdr.Fields.size(); }

  QvdTableHeader GetTableHeader() { return _hdr; }

private:
  bool parseXmlHeader(const char *filename);
  bool parseSymbolAndData();

  size_t readBytes();
  char peekByte();
  char readByte();
  int readInt32();
  double readDouble();
  int get_bits_index(size_t nBits);
  void advanceBytes(size_t nBytes);

  QvdTableHeader _hdr;

  unsigned int _lastFieldIndex;
  std::string _currentTag;
  std::string _data;

  // Move to another class?
  FILE *_fp;
  char _buf[BUFSIZ];
  char *_dataPtrStart;
  size_t _bufLen;
  bool _eof;
  unsigned int _bitBuffer; // 32 bit bit buffer
  unsigned int _bitBufferSz;
};

#endif /* __QVDFILE_H__ */