mpeg3io.h

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/**********************************************************************
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef MPEG3IO_H
#define MPEG3IO_H


#include <stdio.h>
#include "mpeg3css.h"
#include "mpeg3private.inc"

/* Filesystem structure */

typedef struct
{
        FILE *fd;
        mpeg3_css_t *css;          /* Encryption object */
        char path[MPEG3_STRLEN];
/* Hypothetical position of file pointer */
        long current_byte;
        long total_bytes;
} mpeg3_fs_t;

#define mpeg3io_tell(fs) (((mpeg3_fs_t *)(fs))->current_byte)

// End of file
#define mpeg3io_eof(fs) (((mpeg3_fs_t *)(fs))->current_byte >= ((mpeg3_fs_t *)(fs))->total_bytes)

// Beginning of file
#define mpeg3io_bof(fs) (((mpeg3_fs_t *)(fs))->current_byte < 0)


#define mpeg3io_total_bytes(fs) (((mpeg3_fs_t *)(fs))->total_bytes)

extern inline unsigned int mpeg3io_read_int32(mpeg3_fs_t *fs)
{
        int a, b, c, d;
        unsigned int result;
/* Do not fread.  This breaks byte ordering. */
        a = (unsigned char)fgetc(fs->fd);
        b = (unsigned char)fgetc(fs->fd);
        c = (unsigned char)fgetc(fs->fd);
        d = (unsigned char)fgetc(fs->fd);
        result = ((int)a << 24) |
                                        ((int)b << 16) |
                                        ((int)c << 8) |
                                        ((int)d);
        fs->current_byte += 4;
        return result;
}

extern inline unsigned int mpeg3io_read_char(mpeg3_fs_t *fs)
{
        fs->current_byte++;
        return fgetc(fs->fd);
}

#endif

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