/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#include <gst/gst.h>
#include "mikmod_types.h"
#include <string.h>		/* memcmp */
#include <ctype.h>		/* isdigit */

#define MODULEHEADERSIZE 0x438

 
gboolean MOD_CheckType( GstBuffer *buf )
{
gchar *data;
		
	data = GST_BUFFER_DATA( buf ) + MODULEHEADERSIZE;	
	
	/* Protracker and variants */
	if (( ! memcmp( data, "M.K.", 4 )) || ( ! memcmp( data, "M!K!", 4 )))
		return TRUE;
	
	/* Star Tracker */
	if ((( ! memcmp( data, "FLT", 3 )) || ( ! memcmp( data, "EXO", 3 ))) && ( isdigit( data[3] )))
		return TRUE;
	
	/* Oktalyzer (Amiga) */
	if (! memcmp( data, "OKTA", 4 )) 
		return TRUE;
	
	/* Oktalyser (Atari) */
	if ( ! memcmp( data, "CD81", 4 ))
		return TRUE;
	
	/* Fasttracker */
	if (( ! memcmp( data + 1, "CHN", 3 )) && ( isdigit( data[0] ))) 
		return TRUE;
		
	/* Fasttracker or Taketracker */
	if ((( ! memcmp( data + 2, "CH", 2 )) || ( ! memcmp( data + 2, "CN", 2 ))) && ( isdigit( data[0] )) && ( isdigit( data[1] ))) 
		return TRUE;
	
	return FALSE;
}

gboolean Mod_669_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );
	
	if( ! memcmp( data, "if", 2 ) || ! memcmp( data, "JN", 2 )) 
		return TRUE;
	
	return FALSE;
}

gboolean Amf_CheckType( GstBuffer *buf )
{
gchar *data;
	
    data = GST_BUFFER_DATA( buf );
	
    if( memcmp( data, "AMF", 3) ) 
      return FALSE;   
	
    data = GST_BUFFER_DATA( buf ) + 3;
		
	if (( (gint)*data >= 10 ) && ( (gint)*data <= 14 )) 
	  return TRUE;
	
	return FALSE;
}

gboolean Dsm_CheckType( GstBuffer *buf )
{
gchar *data;
	
    data = GST_BUFFER_DATA( buf );
	
	if( ! memcmp( data, "RIFF", 4 ) && ! memcmp( data + 8, "DSMF", 4 )) 
	  return TRUE;
	
	return FALSE;
}

gboolean Fam_CheckType( GstBuffer *buf )
{
gchar *data;	
static	unsigned char FARSIG[4+3]={'F','A','R',0xfe,13,10,26};

	data = GST_BUFFER_DATA( buf );
	
	if(( memcmp( data, FARSIG, 4 )) || ( memcmp( data + 44, FARSIG + 4, 3 )))
	  return FALSE;
	
	return 1;
}

gboolean Gdm_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );
	
	if ( ! memcmp( data, "GDM\xfe", 4 ) &&  ! memcmp( data + 71, "GMFS", 4 ))
		return TRUE;
	
	return FALSE;
}

gboolean Imf_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf ) + 0x3c;
		
	if( ! memcmp( data, "IM10", 4))
		return TRUE;
		
	return FALSE;
}

gboolean It_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );
		
	if( ! memcmp( data, "IMPM", 4 )) 
		return TRUE;
		
	return FALSE;
}

gboolean M15_CheckType( GstBuffer *buf )
{
	/* FIXME: M15 CheckType to do */
	return FALSE;
}

gboolean Med_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );
		
	if(( ! memcmp(data, "MMD0", 4 )) || ( memcmp( data, "MMD1", 4 )))
		return TRUE;
	
	return FALSE;
}

gboolean Mtm_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );

	if( ! memcmp( data, "MTM", 3 ))
		return TRUE;
	
	return FALSE;
}

gboolean Okt_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );

	if( ! memcmp( data, "OKTSONG", 8 ))
		return TRUE;
	
	return FALSE;
}

gboolean S3m_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf ) + 0x2c;

	if( ! memcmp( data, "SCRM", 4 ))
		return TRUE;
	
	return FALSE;
}

gboolean Xm_CheckType( GstBuffer *buf )
{
gchar *data;
	
	data = GST_BUFFER_DATA( buf );

	if( memcmp( data, "Extended Module: ", 17 ))
		return FALSE;
	
	if( data[ 37 ] == 0x1a )
		return TRUE;
	
	return FALSE;
}