/*
    Class definition for the Data_File class
	The Data_File class can be used independently or as part of the MiniDB project.

    Copyright (C) 2007  Hossein Hakimzadeh
	
	Comments and bug fixes can be sent to hhakimza@iusb.edu

    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 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef DATA_FILE_H
#define DATA_FILE_H

#define CLOSED				0
#define OPEN_FOR_READ		1
#define OPEN_FOR_WRITE		2

#define FALSE	0
#define TRUE	1

#define ON		1
#define OFF		0

class Data_File
{
	char          FileName[256];                        // *.dta
	char          RecordSeparator;                      // defaulted to '~'
	char          FieldSeparator;                       // defaulted to '^'
	unsigned long CurrentFileLocation;
	unsigned long EOFLocation;
	int           Verbose;                              // Verbose flag (ON / OFF)

  public:
	Data_File(char *filename, char field_separator, char record_separator);//Constructor
	~Data_File();                                       // Destructor
	void SetRecordSeparator(char separator);            // Default separator = '~'
	void SetFieldSeparator(char separator);             // Default separator = '^'

	void Initialize(void);
	unsigned long GetCurrentFileLocation();
	unsigned long FileSize();

	int  WriteRecord(char *a_record);                   // Write/Append a record
	int  ReadRecord(char *a_record, unsigned long record_location); // Read the record at location or 0 if error
	int  ReadNextRecord(char *a_record);                // Read the next record from file or 0 if error

	int  UnPackRecord(char *a_record, int &number_of_fields, char *fields[]);  // UnPack the record into separate fields
	int  PackRecord(char *a_record, char *fields[]);    // Pack the Fields into a record

	void DumpDataFile(void);

};


#endif