/*
|  Copyright (C) 2002-2007 Jorg Schuler <jcsjcs at users sourceforge net>
|  Part of the gtkpod project.
| 
|  URL: http://www.gtkpod.org/
|  URL: http://gtkpod.sourceforge.net/
|
|  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
|
|  iTunes and iPod are trademarks of Apple
|
|  This product is not supported/written/published by Apple!
|
|  $Id: misc_conversion.c 1578 2007-06-23 02:12:34Z jcsjcs $
*/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#define __USE_XOPEN     /* needed for strptime() with glibc2 */
#define _XOPEN_SOURCE   /* needed for strptime() with glibc2 */

#include <gtk/gtk.h>
#include <math.h>
#include <string.h>

#include "charset.h"
#include "itdb.h"
#include "misc.h"
#include "display.h"
#include "prefs.h"
#include <time.h>


#define DEBUG_MISC 0

/* Note: the toggle buttons for tag_autoset and display_col in the
 * prefs_window are named after the the TM_COLUM_* numbers defined in
 * display.h (Title: tag_autoset0, Artist: tag_autoset1
 * etc.). ign_field is named after T_*. Since the labels to the
 * buttons are set in prefs_window.c when creating the window, you
 * only need to name the buttons in the intended order using
 * glade-2. There is no need to label them. */
/* Strings associated to the column headers */
static const gchar *t_strings[] = {
    N_("All"),               /*  0 */
    N_("Album"),
    N_("Artist"),
    N_("Title"),
    N_("Genre"),
    N_("Comment"),           /*  5 */
    N_("Composer"),
    N_("File type"),
    N_("PC File"),
    N_("iPod File"),
    N_("iPod ID"),           /* 10 */
    N_("Track Nr (#)"),
    N_("Transferred"),
    N_("File Size"),
    N_("Play Time"),
    N_("Bitrate"),           /* 15 */
    N_("Samplerate"),
    N_("BPM"),
    N_("Playcount"),
    N_("Rating"),
    N_("Date added"),        /* 20 */
    N_("Date played"),
    N_("Date modified"),
    N_("Volume"),
    N_("Soundcheck"),
    N_("Year"),              /* 25 */
    N_("CD Nr"),
    N_("Grouping"),
    N_("Compilation"),
    N_("Category"),
    N_("Description"),       /* 30 */
    N_("Podcast URL"),
    N_("Podcast RSS"),
    N_("Subtitle"),
    N_("Date released"),
    N_("Checked"),           /* 35 */
    N_("Start time"),
    N_("Stop time"),
    N_("Remember Playback Position"),
    N_("Skip when Shuffling"),
    N_("Artwork Path"),      /* 40 */
    N_("Media Type"),
    N_("TV Show"),
    N_("TV Episode"),
    N_("TV Network"),
    N_("Season Nr"),         /* 45 */
    N_("Episode Nr"),
    N_("Album Artist"),
    N_("Sort Artist"),
    N_("Sort Title"),
    N_("Sort Album"),        /* 50 */
    N_("Sort Album Artist"),
    N_("Sort Composer"),
    N_("Sort TV Show"),
    NULL };

/* Tooltips for prefs window */
static const gchar *t_tooltips[] = {
    NULL,                                              /*  0 */
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,                                              /*  5 */
    NULL,
    NULL,
    N_("Name of file on PC, if available"),
    N_("Name of file on the iPod"),
    NULL,                                              /* 10 */
    N_("Track Nr. and total number of tracks on CD"),
    N_("Whether the file has already been "
       "transferred to the iPod or not"),
    NULL,
    NULL,
    NULL,                                              /* 15 */
    NULL,
    N_("Beats per minute"),
    N_("Number of times the track has been played"),
    N_("Star rating from 0 to 5"),
    N_("Date and time track has been added"),          /* 20 */
    N_("Date and time track has last been played"),
    N_("Date and time track has last been modified"),
    N_("Manual volume adjust"),
    N_("Volume adjust in dB (replay gain) -- "
       "you need to activate 'soundcheck' on the iPod"),
    NULL,                                              /* 25 */
    N_("CD Nr. and total number of CDS in set"),
    NULL,
    NULL,
    N_("The category (e.g. 'Technology' or 'Music') where the podcast was located."),
    N_("Accessible by selecting the center button on the iPod."), /* 30 */
    NULL,
    NULL,
    NULL,
    N_("Release date (for podcasts displayed next to the title on the iPod)"),
    NULL,   /* 35 */
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,   /* 40 */
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,   /* 45 */
    NULL,
    NULL,
    N_("Used for sorting on the iPod"),
    N_("Used for sorting on the iPod"),
    N_("Used for sorting on the iPod"),  /* 50 */
    N_("Used for sorting on the iPod"),
    N_("Used for sorting on the iPod"),
    N_("Used for sorting on the iPod")
 };


/* translates a TM_COLUMN_... (defined in display.h) into a
 * T_... (defined in display.h). Returns -1 in case a translation is not
 * possible */
T_item TM_to_T (TM_item tm)
{
    switch (tm)
    {
    case TM_COLUMN_TITLE:         return T_TITLE;
    case TM_COLUMN_ARTIST:        return T_ARTIST;
    case TM_COLUMN_ALBUM:         return T_ALBUM;
    case TM_COLUMN_GENRE:         return T_GENRE;
    case TM_COLUMN_COMPOSER:      return T_COMPOSER;
    case TM_COLUMN_FILETYPE:      return T_FILETYPE;
    case TM_COLUMN_GROUPING:      return T_GROUPING;
    case TM_COLUMN_TRACK_NR:      return T_TRACK_NR;
    case TM_COLUMN_CD_NR:         return T_CD_NR;
    case TM_COLUMN_IPOD_ID:       return T_IPOD_ID;
    case TM_COLUMN_PC_PATH:       return T_PC_PATH;
    case TM_COLUMN_IPOD_PATH:     return T_IPOD_PATH;
    case TM_COLUMN_TRANSFERRED:   return T_TRANSFERRED;
    case TM_COLUMN_SIZE:          return T_SIZE;
    case TM_COLUMN_TRACKLEN:      return T_TRACKLEN;
    case TM_COLUMN_BITRATE:       return T_BITRATE;
    case TM_COLUMN_SAMPLERATE:    return T_SAMPLERATE;
    case TM_COLUMN_BPM:           return T_BPM;
    case TM_COLUMN_PLAYCOUNT:     return T_PLAYCOUNT;
    case TM_COLUMN_RATING:        return T_RATING;
    case TM_COLUMN_TIME_ADDED:    return T_TIME_ADDED;
    case TM_COLUMN_TIME_PLAYED:   return T_TIME_PLAYED;
    case TM_COLUMN_TIME_MODIFIED: return T_TIME_MODIFIED;
    case TM_COLUMN_VOLUME:        return T_VOLUME;
    case TM_COLUMN_SOUNDCHECK:    return T_SOUNDCHECK;
    case TM_COLUMN_YEAR:          return T_YEAR;
    case TM_COLUMN_COMPILATION:   return T_COMPILATION;
    case TM_COLUMN_COMMENT:       return T_COMMENT;
    case TM_COLUMN_CATEGORY:      return T_CATEGORY;
    case TM_COLUMN_DESCRIPTION:   return T_DESCRIPTION;
    case TM_COLUMN_PODCASTURL:    return T_PODCASTURL;
    case TM_COLUMN_PODCASTRSS:    return T_PODCASTRSS;
    case TM_COLUMN_SUBTITLE:      return T_SUBTITLE;
    case TM_COLUMN_TIME_RELEASED: return T_TIME_RELEASED;
    case TM_COLUMN_THUMB_PATH:    return T_THUMB_PATH;
    case TM_COLUMN_MEDIA_TYPE:    return T_MEDIA_TYPE;
    case TM_COLUMN_TV_SHOW:       return T_TV_SHOW;
    case TM_COLUMN_TV_EPISODE:    return T_TV_EPISODE;
    case TM_COLUMN_TV_NETWORK:    return T_TV_NETWORK;
    case TM_COLUMN_SEASON_NR:     return T_SEASON_NR;
    case TM_COLUMN_EPISODE_NR:    return T_EPISODE_NR;
    case TM_COLUMN_ALBUMARTIST:   return T_ALBUMARTIST;
    case TM_COLUMN_SORT_ARTIST:   return T_SORT_ARTIST;
    case TM_COLUMN_SORT_TITLE:    return T_SORT_TITLE;
    case TM_COLUMN_SORT_ALBUM:    return T_SORT_ALBUM;
    case TM_COLUMN_SORT_ALBUMARTIST: return T_SORT_ALBUMARTIST;
    case TM_COLUMN_SORT_COMPOSER: return T_SORT_COMPOSER;
    case TM_COLUMN_SORT_TVSHOW:   return T_SORT_TVSHOW;
    case TM_NUM_COLUMNS:          g_return_val_if_reached (-1);
    }
    return -1;
}


/* See track_get_item() / track_get_item_pointer()  */
gchar *get_allowed_percent_char(void )
{
    return g_strdup("latgcoysSny");
}
/* translates a char into a T_... (defined in display.h) */
T_item char_to_T(gchar c){
    switch (c) {
        case 'l': return T_ALBUM;
        case 'a': return T_ARTIST;
        case 't': return T_TITLE;
        case 'g': return T_GENRE;
        case 'c': return T_COMMENT;
        case 'o': return T_COMPOSER;
        case 'f': return T_FILETYPE;
        case 's': return T_PC_PATH;
        case 'S': return T_IPOD_PATH;
	    /* case 'i': return T_IPOD_ID; */
        case 'n': return T_TRACK_NR;
	    /* case 'f': return T_TRANSFERRED; */
	    /* case 'z': return T_SIZE; */
	    /* case 'L': return T_TRACKLEN; */
	    /* case 'b': return T_BITRATE; */
	    /* case 'r': return T_SAMPLERATE; */
	    /* case 'b': return T_BPM; */
	    /* case 'C': return T_PLAYCOUNT; */
	    /* case 'i': return T_RATING; */
	    /* case '': return T_TIME_ADDED; */
	    /* case '': return T_TIME_PLAYED; */
	    /* case '': return T_TIME_MODIFIED; */
	    /* case '': return T_VOLUME; */
	    /* case '': return T_SOUNDCHECK; */
        case 'y': return T_YEAR;
	    /* case 'd': return T_CD_NR; */
	    /* case '': return T_GROUPING; */
	    /* case '': return T_COMPILATION; */
	    /* case '': return T_CATEGORY; */
	    /* case '': return T_DESCRIPTION; */
	    /* case '': return T_PODCASTURL; */
	    /* case '': return T_PODCASTRSS; */
	    /* case '': return T_SUBTITLE; */
	    /* case '': return T_TIME_RELEASED; */
	    /* case '': return T_CHECKED; */
    }
    return -1;
}

/* translates a ST_CAT_... (defined in display.h) into a
 * T_... (defined in display.h). Returns -1 in case a translation is not
 * possible */
T_item ST_to_T (ST_CAT_item st)
{
    switch (st)
    {
    case ST_CAT_ARTIST:      return T_ARTIST;
    case ST_CAT_ALBUM:       return T_ALBUM;
    case ST_CAT_GENRE:       return T_GENRE;
    case ST_CAT_COMPOSER:    return T_COMPOSER;
    case ST_CAT_TITLE:       return T_TITLE;
    case ST_CAT_YEAR:        return T_YEAR;
    case ST_CAT_SPECIAL:
    case ST_CAT_NUM:         g_return_val_if_reached (-1);
    }
    return -1;
}


/* return descriptive string (non-localized -- pass through gettext()
 * for the localized version) for tm_item (usually used to name
 * buttons or column headers). */
const gchar *get_tm_string (TM_item tm)
{
    T_item t = TM_to_T (tm);

    g_return_val_if_fail (t != -1, "");

    return t_strings[t];
}


/* return string (non-localized -- pass through gettext()
 * for the localized version) for tm_item that can be used as a
 * tooltip */
const gchar *get_tm_tooltip (TM_item tm)
{
    T_item t = TM_to_T (tm);

    g_return_val_if_fail (t != -1, "");

    return t_tooltips[t];
}


/* return descriptive string (non-localized -- pass through gettext()
 * for the localized version) for tm_item (usually used to name
 * buttons or column headers). */
const gchar *get_t_string (T_item t)
{
    g_return_val_if_fail (t>=0 && t<T_ITEM_NUM, "");

    return t_strings[t];
}


/* return string (non-localized -- pass through gettext()
 * for the localized version) for tm_item that can be used as a
 * tooltip */
const gchar *get_t_tooltip (T_item t)
{
    if ((t >= 0) && (t<T_ITEM_NUM))   return t_tooltips[t];
    else                              return ("");
}



/*------------------------------------------------------------------*\
 *                                                                  *
 *                       Timestamp stuff                            *
 *                                                                  *
\*------------------------------------------------------------------*/


	/* NOTE:
	 *
	 * The iPod (firmware 1.3, 2.0, ...?) doesn't seem to use the
	 * timezone information correctly -- no matter what you set
	 * iPod's timezone to, it will always record as if it were set
	 * to UTC -- we need to subtract the difference between
	 * current timezone and UTC to get a correct
	 * display. 'timezone' (initialized above) contains the
	 * difference in seconds.
	 */
/*	if (playcount->time_played)
	playcount->time_played += timezone;*/
/* FIXME: THIS IS NOT IMPLEMENTED CORRECTLY */


#define DATE_FORMAT_LONG "%x %X"
#define DATE_FORMAT_SHORT "%x"


static gchar *time_to_string_format (time_t t, const gchar *format)
{
    gchar buf[PATH_MAX+1];
    struct tm tm;
    size_t size;

    g_return_val_if_fail (format, NULL);

    if (t)
    {
	localtime_r (&t, &tm);
	size = strftime (buf, PATH_MAX, format, &tm);
	buf[size] = 0;
	return g_locale_to_utf8 (buf, -1, NULL, NULL, NULL);
    }
    return g_strdup ("--");
}



/* converts the time stamp @t to a string (max. length:
 * PATH_MAX). You must g_free the return value */
gchar *time_time_to_string (time_t t)
{
    return time_to_string_format (t, DATE_FORMAT_LONG);
}


/* converts the time stamp @t to a string (max. length PATH_MAX)
   assuming that no time should be shown if the time is 0:00:00 */
gchar *time_fromtime_to_string (time_t t)
{
    struct tm tm;
    
    localtime_r (&t, &tm);
    if ((tm.tm_sec == 0) && (tm.tm_min == 0) && (tm.tm_hour == 0))
	 return time_to_string_format (t, DATE_FORMAT_SHORT);
    else return time_to_string_format (t, DATE_FORMAT_LONG);
}


/* converts the time stamp @t to a string (max. length PATH_MAX)
   assuming that no time should be shown if the time is 23:59:59 */
gchar *time_totime_to_string (time_t t)
{
    struct tm tm;
    
    localtime_r (&t, &tm);
    if ((tm.tm_sec == 59) && (tm.tm_min == 59) && (tm.tm_hour == 23))
	 return time_to_string_format (t, DATE_FORMAT_SHORT);
    else return time_to_string_format (t, DATE_FORMAT_LONG);
}


/* convert the string @str to a time stamp */
time_t time_string_to_time (const gchar *str)
{
    return time_string_to_fromtime (str);
}


/* convert the string @str to a time stamp, assuming 0:00:00 if no
 * time is given. Returns 0 if @str is "--" */
time_t time_string_to_fromtime (const gchar *str)
{
    time_t t;
    struct tm tm;

    g_return_val_if_fail (str, -1);

    if (strcmp (str, "--") == 0)  return 0;

    t = time (NULL);
    localtime_r (&t, &tm);
    tm.tm_sec = 0;
    tm.tm_min = 0;
    tm.tm_hour = 0;
    strptime (str, DATE_FORMAT_LONG, &tm);
    t = mktime (&tm);
    return t;
}


/* convert the string @str to a time stamp, assuming 23:59:59 if only
 * date is specified */
time_t time_string_to_totime (const gchar *str)
{
    time_t t;
    struct tm tm;

    g_return_val_if_fail (str, -1);

    t = time (NULL);
    localtime_r (&t, &tm);
    tm.tm_sec = 59;
    tm.tm_min = 59;
    tm.tm_hour = 23;
    strptime (str, DATE_FORMAT_LONG, &tm);
    t = mktime (&tm);
    return t;
}


/* get the timestamp TM_COLUMN_TIME_CREATE/PLAYED/MODIFIED/RELEASED */
time_t time_get_time (Track *track, T_item t_item)
{
    guint32 mactime = 0;

    if (track) switch (t_item)
    {
    case T_TIME_ADDED:
	mactime = track->time_added;
	break;
    case T_TIME_PLAYED:
	mactime = track->time_played;
	break;
    case T_TIME_MODIFIED:
	mactime = track->time_modified;
	break;
    case T_TIME_RELEASED:
	mactime = track->time_released;
	break;
    default:
	mactime = 0;
	break;
    }
    return mactime;
}


/* hopefully obvious */
gchar *time_field_to_string (Track *track, T_item t_item)
{
    return (time_time_to_string (time_get_time (track, t_item)));
}


/* get the timestamp TM_COLUMN_TIME_CREATE/PLAYED/MODIFIED/RELEASED */
void time_set_time (Track *track, time_t timet, T_item t_item)
{
    g_return_if_fail (track);

    switch (t_item)
    {
    case T_TIME_ADDED:
	track->time_added = timet;
	break;
    case T_TIME_PLAYED:
	track->time_played = timet;
	break;
    case T_TIME_MODIFIED:
	track->time_modified = timet;
	break;
    case T_TIME_RELEASED:
	track->time_released = timet;
	break;
    default:
	break;
    }
}



/* -------------------------------------------------------------------
 * The following is taken straight out of glib2.0.6 (gconvert.c):
 * g_filename_from_uri uses g_filename_from_utf8() to convert from
 * utf8. However, the user might have selected a different charset
 * inside gtkpod -- we must use gtkpod's charset_from_utf8()
 * instead. That's the only line changed...
 * -------------------------------------------------------------------*/

/* Test of haystack has the needle prefix, comparing case
 * insensitive. haystack may be UTF-8, but needle must
 * contain only ascii. */
static gboolean
has_case_prefix (const gchar *haystack, const gchar *needle)
{
  const gchar *h, *n;

  /* Eat one character at a time. */
  h = haystack;
  n = needle;

  while (*n && *h &&
	 g_ascii_tolower (*n) == g_ascii_tolower (*h))
    {
      n++;
      h++;
    }

  return *n == '\0';
}

static int
unescape_character (const char *scanner)
{
  int first_digit;
  int second_digit;

  first_digit = g_ascii_xdigit_value (scanner[0]);
  if (first_digit < 0)
    return -1;

  second_digit = g_ascii_xdigit_value (scanner[1]);
  if (second_digit < 0)
    return -1;

  return (first_digit << 4) | second_digit;
}

static gchar *
g_unescape_uri_string (const char *escaped,
		       int         len,
		       const char *illegal_escaped_characters,
		       gboolean    ascii_must_not_be_escaped)
{
  const gchar *in, *in_end;
  gchar *out, *result;
  int c;

  if (escaped == NULL)
    return NULL;

  if (len < 0)
    len = strlen (escaped);

  result = g_malloc (len + 1);

  out = result;
  for (in = escaped, in_end = escaped + len; in < in_end; in++)
    {
      c = *in;

      if (c == '%')
	{
	  /* catch partial escape sequences past the end of the substring */
	  if (in + 3 > in_end)
	    break;

	  c = unescape_character (in + 1);

	  /* catch bad escape sequences and NUL characters */
	  if (c <= 0)
	    break;

	  /* catch escaped ASCII */
	  if (ascii_must_not_be_escaped && c <= 0x7F)
	    break;

	  /* catch other illegal escaped characters */
	  if (strchr (illegal_escaped_characters, c) != NULL)
	    break;

	  in += 2;
	}

      *out++ = c;
    }

  g_return_val_if_fail (out - result <= len, NULL);
  *out = '\0';

  if (in != in_end || !g_utf8_validate (result, -1, NULL))
    {
      g_free (result);
      return NULL;
    }

  return result;
}

static gboolean
is_escalphanum (gunichar c)
{
  return c > 0x7F || g_ascii_isalnum (c);
}

static gboolean
is_escalpha (gunichar c)
{
  return c > 0x7F || g_ascii_isalpha (c);
}

/* allows an empty string */
static gboolean
hostname_validate (const char *hostname)
{
  const char *p;
  gunichar c, first_char, last_char;

  p = hostname;
  if (*p == '\0')
    return TRUE;
  do
    {
      /* read in a label */
      c = g_utf8_get_char (p);
      p = g_utf8_next_char (p);
      if (!is_escalphanum (c))
	return FALSE;
      first_char = c;
      do
	{
	  last_char = c;
	  c = g_utf8_get_char (p);
	  p = g_utf8_next_char (p);
	}
      while (is_escalphanum (c) || c == '-');
      if (last_char == '-')
	return FALSE;

      /* if that was the last label, check that it was a toplabel */
      if (c == '\0' || (c == '.' && *p == '\0'))
	return is_escalpha (first_char);
    }
  while (c == '.');
  return FALSE;
}

/**
 * g_filename_from_uri:
 * @uri: a uri describing a filename (escaped, encoded in UTF-8).
 * @hostname: Location to store hostname for the URI, or %NULL.
 *            If there is no hostname in the URI, %NULL will be
 *            stored in this location.
 * @error: location to store the error occuring, or %NULL to ignore
 *         errors. Any of the errors in #GConvertError may occur.
 *
 * Converts an escaped UTF-8 encoded URI to a local filename in the
 * encoding used for filenames.
 *
 * Return value: a newly-allocated string holding the resulting
 *               filename, or %NULL on an error.
 **/
gchar *
filename_from_uri (const char *uri,
		   char      **hostname,
		   GError    **error)
{
  const char *path_part;
  const char *host_part;
  char *unescaped_hostname;
  char *result;
  char *filename;
  int offs;
#ifdef G_OS_WIN32
  char *p, *slash;
#endif

  if (hostname)
    *hostname = NULL;

  if (!has_case_prefix (uri, "file:/"))
    {
      g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
		   _("The URI '%s' is not an absolute URI using the file scheme"),
		   uri);
      return NULL;
    }

  path_part = uri + strlen ("file:");

  if (strchr (path_part, '#') != NULL)
    {
      g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
		   _("The local file URI '%s' may not include a '#'"),
		   uri);
      return NULL;
    }

  if (has_case_prefix (path_part, "///"))
    path_part += 2;
  else if (has_case_prefix (path_part, "//"))
    {
      path_part += 2;
      host_part = path_part;

      path_part = strchr (path_part, '/');

      if (path_part == NULL)
	{
	  g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
		       _("The URI '%s' is invalid"),
		       uri);
	  return NULL;
	}

      unescaped_hostname = g_unescape_uri_string (host_part, path_part - host_part, "", TRUE);

      if (unescaped_hostname == NULL ||
	  !hostname_validate (unescaped_hostname))
	{
	  g_free (unescaped_hostname);
	  g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
		       _("The hostname of the URI '%s' is invalid"),
		       uri);
	  return NULL;
	}

      if (hostname)
	*hostname = unescaped_hostname;
      else
	g_free (unescaped_hostname);
    }

  filename = g_unescape_uri_string (path_part, -1, "/", FALSE);

  if (filename == NULL)
    {
      g_set_error (error, G_CONVERT_ERROR, G_CONVERT_ERROR_BAD_URI,
		   _("The URI '%s' contains invalidly escaped characters"),
		   uri);
      return NULL;
    }

  offs = 0;
#ifdef G_OS_WIN32
  /* Drop localhost */
  if (hostname && *hostname != NULL &&
      g_ascii_strcasecmp (*hostname, "localhost") == 0)
    {
      g_free (*hostname);
      *hostname = NULL;
    }

  /* Turn slashes into backslashes, because that's the canonical spelling */
  p = filename;
  while ((slash = strchr (p, '/')) != NULL)
    {
      *slash = '\\';
      p = slash + 1;
    }

  /* Windows URIs with a drive letter can be like "file://host/c:/foo"
   * or "file://host/c|/foo" (some Netscape versions). In those cases, start
   * the filename from the drive letter.
   */
  if (g_ascii_isalpha (filename[1]))
    {
      if (filename[2] == ':')
	offs = 1;
      else if (filename[2] == '|')
	{
	  filename[2] = ':';
	  offs = 1;
	}
    }
#endif

  /* This is where we differ from glib2.0.6: we use
     gtkpod's charset_from_utf8() instead of glib's
     g_filename_from_utf8() */
  result = charset_from_utf8 (filename + offs);
  g_free (filename);

  return result;
}


/* exp10() and log10() are gnu extensions */
#ifndef exp10
#define exp10(x) (exp((x)*log(10)))
#endif

#ifndef log10
#define log10(x) (log(x)/log(10))
#endif

guint32 replaygain_to_soundcheck(gdouble replaygain)
{
    /* according to Samuel Wood -- thanks! */
    return floor (1000. * exp10 (-replaygain * 0.1) + 0.5);
}

gdouble soundcheck_to_replaygain(guint32 soundcheck)
{
    if (soundcheck == 0) return 0;  /* unset should be 0 dB */
    return (-10. * log10 (soundcheck/1000.));
}