/*
 *  psid.h - PSID file format definitions
 *
 *  SIDPlayer (C) Copyright 1996-2004 Christian Bauer
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef PSID_H
#define PSID_H

#include "types.h"


// Minimum and maximum header length
const int PSID_MIN_HEADER_LENGTH = 118;		// Version 1
const int PSID_MAX_HEADER_LENGTH = 124;		// Version 2

// Offsets of fields in header (all fields big-endian)
enum {
	PSID_ID = 0,			// 'PSID'
	PSID_VERSION = 4,		// 1 or 2
	PSID_LENGTH = 6,		// Header length
	PSID_START = 8,			// C64 load address
	PSID_INIT = 10,			// C64 init routine address
	PSID_MAIN = 12,			// C64 replay routine address
	PSID_NUMBER = 14,		// Number of subsongs
	PSID_DEFSONG = 16,		// Main subsong number
	PSID_SPEED = 18,		// Speed flags (1 bit/song)
	PSID_NAME = 22,			// Module name (ISO Latin1 character set)
	PSID_AUTHOR = 54,		// Author name (dto.)
	PSID_COPYRIGHT = 86,	// Copyright info (dto.)
	PSID_FLAGS = 118,		// Flags (only in version 2 header)
	PSID_RESERVED = 120
};

// Read 16-bit quantity from PSID header
inline uint16 read_psid_16(const uint8 *p, int offset)
{
	return (p[offset] << 8) | p[offset + 1];
}

// Read 32-bit quantity from PSID header
inline uint32 read_psid_32(const uint8 *p, int offset)
{
	return (p[offset] << 24) | (p[offset + 1] << 16) | (p[offset + 2] << 8) | p[offset + 3];
}

#endif