/* Copyright (c) 2007, Christophe Fergeau  <teuf@gnome.org>

 * Part of the libgpod project.

 * 

 * URL: http://www.gtkpod.org/

 * URL: http://gtkpod.sourceforge.net/

 *

 * The code contained in this file is free software; you can redistribute

 * it and/or modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either version

 * 2.1 of the License, or (at your option) any later version.

 *

 * This file 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this code; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * iTunes and iPod are trademarks of Apple

 *

 * This product is not supported/written/published by Apple!

 *

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <unistd.h>

#include <scsi/sg_cmds.h>

#include <sys/stat.h>

#include <time.h>

#include <glib.h>

extern void sync_time (const char *device, struct tm *tm);

extern char *read_sysinfo_extended (const char *device);

/* do_sg_inquiry and read_sysinfo_extended were heavily

 * inspired from libipoddevice

 */

static unsigned char

do_sg_inquiry (int fd, int page, char *buf, char **start)

{

    const unsigned int IPOD_BUF_LENGTH = 252;

    if (sg_ll_inquiry (fd, 0, 1, page, buf, IPOD_BUF_LENGTH, 1, 0) != 0) {

	*start = NULL;

	return 0;

    } else {

	*start = buf + 4;

	return (unsigned char)buf[3];

    }

}

G_GNUC_INTERNAL char *

read_sysinfo_extended (const char *device)

{

    int fd;

    const unsigned int IPOD_XML_PAGE = 0xc0;

    unsigned char len;

    char buf[512];

    char *start;

    char *offsets;

    GString *xml_sysinfo;

    unsigned int i;

    fd = open (device, O_RDONLY);

    if (fd < 0) {

	return NULL;

    }

    len = do_sg_inquiry (fd, IPOD_XML_PAGE, buf, &start;;

    if (start == NULL || len == 0) {

	close(fd);

	return NULL;

    }

    offsets = g_new (char, len+1);

    memcpy(offsets, start, len);

    offsets[len] = 0;

    xml_sysinfo = g_string_new_len (NULL, 512);

    if (xml_sysinfo == NULL) {

	g_free (offsets);

	close (fd);

	return NULL;

    }

    for (i = 0; offsets[i]; i++) {

	bzero(buf, 512);

	len = do_sg_inquiry (fd, offsets[i], buf, &start;;

	start[len] = 0;

	g_string_append (xml_sysinfo, start);

    }

    g_free (offsets);

    close (fd);

    return g_string_free (xml_sysinfo, FALSE);

}

static void do_sg_write_buffer (const char *device, void *buffer, size_t len)

{

    int fd;

    guint i;

    fd = open (device, O_RDWR);

    if (fd < 0) {

	g_warning ("Couldn't open device %s", device);

	return;

    }

    g_print ("    Data Payload: ");

    for (i = 0; i < len; i++) {

	g_print ("%02x ", *((guchar *)buffer+i));

    }

    g_print ("\n");

    if (sg_ll_write_buffer (fd, 1, 0, 0x0c0000, buffer, len, 1, 1) != 0) {

	g_print ("Error sending data\n");

    }

    close(fd);

}

G_GNUC_INTERNAL void sync_time (const char *device, struct tm *tm)

{

    struct iPodTime {

	guint16 year;

	guint16 days;

	guchar timezone;

	guchar hour;

	guchar minute;

	guchar second;

	guchar dst;

	guchar padding[3];

    } __attribute__((__packed__));

    struct iPodTime ipod_time;

    if (tm == NULL) {

	time_t current_time;

	current_time = time (NULL);

	tm = localtime (&current_time);

    }

    ipod_time.year = GUINT16_TO_BE (1900+tm->tm_year);

    ipod_time.days = GUINT16_TO_BE (tm->tm_yday);

    /* the timezone value is the shift east of UTC in 15 min chunks

     * so eg. UTC+2 is 2*4 = 8

     */

    ipod_time.timezone = tm->tm_gmtoff / 900;

    ipod_time.hour = tm->tm_hour;

    ipod_time.minute = tm->tm_min;

    ipod_time.second = tm->tm_sec;

    if (tm->tm_isdst) {

	ipod_time.dst = 1;

    } else {

	ipod_time.dst = 0;

    }

    memset (ipod_time.padding, 0, sizeof (ipod_time.padding));

    do_sg_write_buffer (device, &ipod_time, sizeof (ipod_time));

}