/****************************************************************************
 * htmlfilter.h                                                             *
 *                                                                          *
 * LocalGate Local Filesystem -> WWW Gateway                                *
 *                                                                          *
 * LocalGate allows a user to access HTML files on the local filesystem     *
 * as if they had a web server to access the files.                         *
 *                                                                          *
 * htmlfilter.h: header file for html filter for LocalGate.                 *
 *                                                                          *
 * Copyright (C) 1997  Michael Chu                                          *
 * This file is part of the LocalGate local filesystem -> WWW gateway.      *
 *                                                                          *
 * 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 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, write to the Free Software              *
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
 *                                                                          *
 * Contact information:      Michael Chu                                    *
 *                           mmchu@pobox.com                                *
 ****************************************************************************/


#ifndef _HTMLFILTER_H_
#define _HTMLFILTER_H_


/********************************** DEFINITIONS *****************************/

/* redefines YY_INPUT to read from socket. */
#undef YY_INPUT
#define YY_INPUT(buffer, numBytesRead, maxSize) \
  /* try to read 1 (one) byte from the file. */ \
  numBytesRead = readFromFile(filterFileId, buffer, 1)

/* redefines unput to move file position back one. */
#undef unput
#define unput(oldChar) \
  /* if file position is not already at beginning of file, decrement it. */ \
  if (filterFilePos > 0) { \
    /* decrement file position. */ \
    filterFilePos--; \
  }


/********************************** PROTOTYPES ******************************/

extern int isHTMLFileName(char *fileName);
extern int filterHTMLFileToSocket(int fileId, int socketId);


#endif  /* _HTMLFILTER_H_ */