updateiconcache.c 37.1 KB
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/* updateiconcache.c
 * Copyright (C) 2004  Anders Carlsson <andersca@gnome.org>
 *
 * 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.
 */

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#include "config.h"
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#include <locale.h>
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#ifdef _MSC_VER
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#include <io.h>
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#include <sys/utime.h>
#else
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#include <utime.h>
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#endif
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <gdk-pixbuf/gdk-pixdata.h>
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#include <glib/gi18n.h>
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#include "gtkiconcachevalidator.h"
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static gboolean force_update = FALSE;
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static gboolean ignore_theme_index = FALSE;
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static gboolean quiet = FALSE;
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static gboolean index_only = FALSE;
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static gboolean validate = FALSE;
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static gchar *var_name = "-";
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/* Quite ugly - if we just add the c file to the
 * list of sources in Makefile.am, libtool complains.
 */
#include "gtkiconcachevalidator.c"

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#define CACHE_NAME "icon-theme.cache"

#define HAS_SUFFIX_XPM (1 << 0)
#define HAS_SUFFIX_SVG (1 << 1)
#define HAS_SUFFIX_PNG (1 << 2)
#define HAS_ICON_FILE  (1 << 3)

#define MAJOR_VERSION 1
#define MINOR_VERSION 0
#define HASH_OFFSET 12

#define ALIGN_VALUE(this, boundary) \
  (( ((unsigned long)(this)) + (((unsigned long)(boundary)) -1)) & (~(((unsigned long)(boundary))-1)))

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#ifdef HAVE_FTW_H

#include <ftw.h>

static struct stat cache_stat;
static gboolean cache_up_to_date;

static int check_dir_mtime (const char        *dir, 
                            const struct stat *sb,
                            int                tf)
{
  if (tf != FTW_NS && sb->st_mtime > cache_stat.st_mtime)
    {
      cache_up_to_date = FALSE;
      /* stop tree walk */
      return 1;
    }

  return 0;
}

 gboolean
 is_cache_up_to_date (const gchar *path)
 {
  gchar *cache_path;
  gint retval;

  cache_path = g_build_filename (path, CACHE_NAME, NULL);
  retval = g_stat (cache_path, &cache_stat);
  g_free (cache_path);
  
  if (retval < 0)
    {
      /* Cache file not found */
      return FALSE;
    }

  cache_up_to_date = TRUE;

  ftw (path, check_dir_mtime, 20);

  return cache_up_to_date;
}

#else  /* !HAVE_FTW_H */

gboolean
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is_cache_up_to_date (const gchar *path)
{
  struct stat path_stat, cache_stat;
  gchar *cache_path;
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  int retval; 
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  retval = g_stat (path, &path_stat);
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  if (retval < 0) 
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    {
      /* We can't stat the path,
       * assume we have a updated cache */
      return TRUE;
    }

  cache_path = g_build_filename (path, CACHE_NAME, NULL);
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  retval = g_stat (cache_path, &cache_stat);
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  g_free (cache_path);
  
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  if (retval < 0)
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    {
      /* Cache file not found */
      return FALSE;
    }

  /* Check mtime */
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  return cache_stat.st_mtime >= path_stat.st_mtime;
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}

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#endif  /* !HAVE_FTW_H */

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static gboolean
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has_theme_index (const gchar *path)
{
  gboolean result;
  gchar *index_path;

  index_path = g_build_filename (path, "index.theme", NULL);

  result = g_file_test (index_path, G_FILE_TEST_IS_REGULAR);
  
  g_free (index_path);

  return result;
}


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typedef struct 
{
  GdkPixdata pixdata;
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  gboolean has_pixdata;
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  guint32 offset;
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  guint size;
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} ImageData;

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typedef struct 
{
  int has_embedded_rect;
  int x0, y0, x1, y1;
  
  int n_attach_points;
  int *attach_points;
  
  int n_display_names;
  char **display_names;

  guint32 offset;
  gint size;
} IconData;

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static GHashTable *image_data_hash = NULL;
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static GHashTable *icon_data_hash = NULL;
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typedef struct
{
  int flags;
  int dir_index;
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  ImageData *image_data;
  guint pixel_data_size;
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  IconData *icon_data;
  guint icon_data_size;
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} Image;

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static gboolean
foreach_remove_func (gpointer key, gpointer value, gpointer user_data)
{
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  Image *image = (Image *)value;
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  GHashTable *files = user_data;
  GList *list;
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  gboolean free_key = FALSE;  

  if (image->flags == HAS_ICON_FILE)
    {
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      /* just a .icon file, throw away */
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      g_free (key);
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      g_free (image);
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      return TRUE;
    }

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  list = g_hash_table_lookup (files, key);
  if (list)
    free_key = TRUE;
  
  list = g_list_prepend (list, value);
  g_hash_table_insert (files, key, list);
  
  if (free_key)
    g_free (key);
  
  return TRUE;
}

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static IconData *
load_icon_data (const char *path)
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{
  GKeyFile *icon_file;
  char **split;
  gsize length;
  char *str;
  char *split_point;
  int i;
  gint *ivalues;
  GError *error = NULL;
  gchar **keys;
  gsize n_keys;
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  IconData *data;
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  icon_file = g_key_file_new ();
  g_key_file_set_list_separator (icon_file, ',');
  g_key_file_load_from_file (icon_file, path, G_KEY_FILE_KEEP_TRANSLATIONS, &error);
  if (error)
    {
      g_error_free (error);
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      g_key_file_free (icon_file);

      return NULL;
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    }

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  data = g_new0 (IconData, 1);

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  ivalues = g_key_file_get_integer_list (icon_file, 
					 "Icon Data", "EmbeddedTextRectangle",
					 &length, NULL);
  if (ivalues)
    {
      if (length == 4)
	{
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	  data->has_embedded_rect = TRUE;
	  data->x0 = ivalues[0];
	  data->y0 = ivalues[1];
	  data->x1 = ivalues[2];
	  data->y1 = ivalues[3];
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	}
      
      g_free (ivalues);
    }
      
  str = g_key_file_get_string (icon_file, "Icon Data", "AttachPoints", NULL);
  if (str)
    {
      split = g_strsplit (str, "|", -1);
      
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      data->n_attach_points = g_strv_length (split);
      data->attach_points = g_new (int, 2 * data->n_attach_points);
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      i = 0;
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      while (split[i] != NULL && i < data->n_attach_points)
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	{
	  split_point = strchr (split[i], ',');
	  if (split_point)
	    {
	      *split_point = 0;
	      split_point++;
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	      data->attach_points[2 * i] = atoi (split[i]);
	      data->attach_points[2 * i + 1] = atoi (split_point);
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	    }
	  i++;
	}
      
      g_strfreev (split);
      g_free (str);
    }
      
  keys = g_key_file_get_keys (icon_file, "Icon Data", &n_keys, &error);
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  data->display_names = g_new0 (gchar *, 2 * n_keys + 1); 
  data->n_display_names = 0;
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  for (i = 0; i < n_keys; i++)
    {
      gchar *lang, *name;
      
      if (g_str_has_prefix (keys[i], "DisplayName"))
	{
	  gchar *open, *close = NULL;
	  
	  open = strchr (keys[i], '[');

	  if (open)
	    close = strchr (open, ']');

	  if (open && close)
	    {
	      lang = g_strndup (open + 1, close - open - 1);
	      name = g_key_file_get_locale_string (icon_file, 
						   "Icon Data", "DisplayName",
						   lang, NULL);
	    }
	  else
	    {
	      lang = g_strdup ("C");
	      name = g_key_file_get_string (icon_file, 
					    "Icon Data", "DisplayName",
					    NULL);
	    }
	  
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	  data->display_names[2 * data->n_display_names] = lang;
	  data->display_names[2 * data->n_display_names + 1] = name;
	  data->n_display_names++;
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	}
    }

  g_strfreev (keys);
  
  g_key_file_free (icon_file);
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  /* -1 means not computed yet, the real value depends
   * on string pool state, and will be computed 
   * later 
   */
  data->size = -1;

  return data;
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}

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/*
 * This function was copied from gtkfilesystemunix.c, it should
 * probably go to GLib
 */
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static void
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canonicalize_filename (gchar *filename)
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{
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  gchar *p, *q;
  gboolean last_was_slash = FALSE;

  p = filename;
  q = filename;

  while (*p)
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    {
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      if (*p == G_DIR_SEPARATOR)
	{
	  if (!last_was_slash)
	    *q++ = G_DIR_SEPARATOR;

	  last_was_slash = TRUE;
	}
      else
	{
	  if (last_was_slash && *p == '.')
	    {
	      if (*(p + 1) == G_DIR_SEPARATOR ||
		  *(p + 1) == '\0')
		{
		  if (*(p + 1) == '\0')
		    break;

		  p += 1;
		}
	      else if (*(p + 1) == '.' &&
		       (*(p + 2) == G_DIR_SEPARATOR ||
			*(p + 2) == '\0'))
		{
		  if (q > filename + 1)
		    {
		      q--;
		      while (q > filename + 1 &&
			     *(q - 1) != G_DIR_SEPARATOR)
			q--;
		    }

		  if (*(p + 2) == '\0')
		    break;

		  p += 2;
		}
	      else
		{
		  *q++ = *p;
		  last_was_slash = FALSE;
		}
	    }
	  else
	    {
	      *q++ = *p;
	      last_was_slash = FALSE;
	    }
	}

      p++;
    }

  if (q > filename + 1 && *(q - 1) == G_DIR_SEPARATOR)
    q--;

  *q = '\0';
}

static gchar *
follow_links (const gchar *path)
{
  gchar *target;
  gchar *d, *s;
  gchar *path2 = NULL;

  path2 = g_strdup (path);
  while (g_file_test (path2, G_FILE_TEST_IS_SYMLINK))
    {
      target = g_file_read_link (path2, NULL);
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      if (target)
	{
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	  if (g_path_is_absolute (target))
	    path2 = target;
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	  else
	    {
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	      d = g_path_get_dirname (path2);
	      s = g_build_filename (d, target, NULL);
	      g_free (d);
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	      g_free (target);
	      g_free (path2);
	      path2 = s;
	    }
	}
      else
	break;
    }

  if (strcmp (path, path2) == 0)
    {
      g_free (path2);
      path2 = NULL;
    }

  return path2;
}

static void
maybe_cache_image_data (Image       *image, 
			const gchar *path)
{
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  if (!index_only && !image->image_data && 
      (g_str_has_suffix (path, ".png") || g_str_has_suffix (path, ".xpm")))
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    {
      GdkPixbuf *pixbuf;
      ImageData *idata;
      gchar *path2;

      idata = g_hash_table_lookup (image_data_hash, path);
      path2 = follow_links (path);

      if (path2)
	{
	  ImageData *idata2;

	  canonicalize_filename (path2);
  
	  idata2 = g_hash_table_lookup (image_data_hash, path2);

	  if (idata && idata2 && idata != idata2)
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	    g_error (_("different idatas found for symlinked '%s' and '%s'\n"),
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		     path, path2);

	  if (idata && !idata2)
	    g_hash_table_insert (image_data_hash, g_strdup (path2), idata);

	  if (!idata && idata2)
	    {
	      g_hash_table_insert (image_data_hash, g_strdup (path), idata2);
	      idata = idata2;
	    }
	}
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      if (!idata)
	{
	  idata = g_new0 (ImageData, 1);
	  g_hash_table_insert (image_data_hash, g_strdup (path), idata);
	  if (path2)
	    g_hash_table_insert (image_data_hash, g_strdup (path2), idata);  
	}

      if (!idata->has_pixdata)
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	{
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	  pixbuf = gdk_pixbuf_new_from_file (path, NULL);
	  
	  if (pixbuf) 
	    {
	      gdk_pixdata_from_pixbuf (&idata->pixdata, pixbuf, FALSE);
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	      idata->size = idata->pixdata.length + 8;
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	      idata->has_pixdata = TRUE;
	    }
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	}
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      image->image_data = idata;

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      g_free (path2);
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    }
}

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static void
maybe_cache_icon_data (Image       *image,
                       const gchar *path)
{
  if (g_str_has_suffix (path, ".icon"))
    {
      IconData *idata = NULL;
      gchar *path2 = NULL;

      idata = g_hash_table_lookup (icon_data_hash, path);
      path2 = follow_links (path);

      if (path2)
	{
	  IconData *idata2;

	  canonicalize_filename (path2);
  
	  idata2 = g_hash_table_lookup (icon_data_hash, path2);

	  if (idata && idata2 && idata != idata2)
	    g_error (_("different idatas found for symlinked '%s' and '%s'\n"),
		     path, path2);

	  if (idata && !idata2)
	    g_hash_table_insert (icon_data_hash, g_strdup (path2), idata);

	  if (!idata && idata2)
	    {
	      g_hash_table_insert (icon_data_hash, g_strdup (path), idata2);
	      idata = idata2;
	    }
	}
      
      if (!idata)
	{
	  idata = load_icon_data (path);
	  g_hash_table_insert (icon_data_hash, g_strdup (path), idata);
	  if (path2)
	    g_hash_table_insert (icon_data_hash, g_strdup (path2), idata);  
        }

      image->icon_data = idata;

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      g_free (path2);
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    }
}

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static GList *
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scan_directory (const gchar *base_path, 
		const gchar *subdir, 
		GHashTable  *files, 
		GList       *directories,
		gint         depth)
{
  GHashTable *dir_hash;
  GDir *dir;
  const gchar *name;
  gchar *dir_path;
  gboolean dir_added = FALSE;
  guint dir_index = 0xffff;
  
  dir_path = g_build_filename (base_path, subdir, NULL);

  /* FIXME: Use the gerror */
  dir = g_dir_open (dir_path, 0, NULL);
  
  if (!dir)
    return directories;
  
  dir_hash = g_hash_table_new (g_str_hash, g_str_equal);

  while ((name = g_dir_read_name (dir)))
    {
      gchar *path;
      gboolean retval;
      int flags = 0;
      Image *image;
      gchar *basename, *dot;

      path = g_build_filename (dir_path, name, NULL);
      retval = g_file_test (path, G_FILE_TEST_IS_DIR);
      if (retval)
	{
	  gchar *subsubdir;

	  if (subdir)
	    subsubdir = g_build_filename (subdir, name, NULL);
	  else
	    subsubdir = g_strdup (name);
	  directories = scan_directory (base_path, subsubdir, files, 
					directories, depth + 1);
	  g_free (subsubdir);

	  continue;
	}

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      /* ignore images in the toplevel directory */
      if (subdir == NULL)
        continue;

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      retval = g_file_test (path, G_FILE_TEST_IS_REGULAR);
      if (retval)
	{
	  if (g_str_has_suffix (name, ".png"))
	    flags |= HAS_SUFFIX_PNG;
	  else if (g_str_has_suffix (name, ".svg"))
	    flags |= HAS_SUFFIX_SVG;
	  else if (g_str_has_suffix (name, ".xpm"))
	    flags |= HAS_SUFFIX_XPM;
	  else if (g_str_has_suffix (name, ".icon"))
	    flags |= HAS_ICON_FILE;
	  
	  if (flags == 0)
	    continue;
	  
	  basename = g_strdup (name);
	  dot = strrchr (basename, '.');
	  *dot = '\0';
	  
	  image = g_hash_table_lookup (dir_hash, basename);
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	  if (!image)
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	    {
	      if (!dir_added) 
		{
		  dir_added = TRUE;
		  if (subdir)
		    {
		      dir_index = g_list_length (directories);
		      directories = g_list_append (directories, g_strdup (subdir));
		    }
		  else
		    dir_index = 0xffff;
		}
		
	      image = g_new0 (Image, 1);
	      image->dir_index = dir_index;
	      g_hash_table_insert (dir_hash, g_strdup (basename), image);
	    }

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	  image->flags |= flags;
      
	  maybe_cache_image_data (image, path);
          maybe_cache_icon_data (image, path);
       
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	  g_free (basename);
	}
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      g_free (path);
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    }

  g_dir_close (dir);

  /* Move dir into the big file hash */
  g_hash_table_foreach_remove (dir_hash, foreach_remove_func, files);
  
  g_hash_table_destroy (dir_hash);

  return directories;
}

typedef struct _HashNode HashNode;

struct _HashNode
{
  HashNode *next;
  gchar *name;
  GList *image_list;
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  gint offset;
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};

static guint
icon_name_hash (gconstpointer key)
{
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  const signed char *p = key;
  guint32 h = *p;
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  if (h)
    for (p += 1; *p != '\0'; p++)
      h = (h << 5) - h + *p;

  return h;
}

typedef struct {
  gint size;
  HashNode **nodes;
} HashContext;

static gboolean
convert_to_hash (gpointer key, gpointer value, gpointer user_data)
{
  HashContext *context = user_data;
  guint hash;
  HashNode *node;
  
  hash = icon_name_hash (key) % context->size;

  node = g_new0 (HashNode, 1);
  node->next = NULL;
  node->name = key;
  node->image_list = value;

  if (context->nodes[hash] != NULL)
    node->next = context->nodes[hash];

  context->nodes[hash] = node;
  
  return TRUE;
}

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static GHashTable *string_pool = NULL;
 
static int
find_string (const gchar *n)
{
  return GPOINTER_TO_INT (g_hash_table_lookup (string_pool, n));
}

static void
add_string (const gchar *n, int offset)
{
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  g_hash_table_insert (string_pool, (gpointer) n, GINT_TO_POINTER (offset));
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}

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static gboolean
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write_string (FILE *cache, const gchar *n)
{
  gchar *s;
  int i, l;
  
  l = ALIGN_VALUE (strlen (n) + 1, 4);
  
  s = g_malloc0 (l);
  strcpy (s, n);

  i = fwrite (s, l, 1, cache);

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  g_free (s);

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  return i == 1;
  
}

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static gboolean
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write_card16 (FILE *cache, guint16 n)
{
  int i;

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  n = GUINT16_TO_BE (n);
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  i = fwrite ((char *)&n, 2, 1, cache);
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  return i == 1;
}

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static gboolean
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write_card32 (FILE *cache, guint32 n)
{
  int i;

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  n = GUINT32_TO_BE (n);
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  i = fwrite ((char *)&n, 4, 1, cache);
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  return i == 1;
}

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static gboolean
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write_image_data (FILE *cache, ImageData *image_data, int offset)
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{
  guint8 *s;
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  guint len;
  gint i;
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  GdkPixdata *pixdata = &image_data->pixdata;
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  /* Type 0 is GdkPixdata */
  if (!write_card32 (cache, 0))
    return FALSE;

  s = gdk_pixdata_serialize (pixdata, &len);

  if (!write_card32 (cache, len))
    {
      g_free (s);
      return FALSE;
    }

  i = fwrite (s, len, 1, cache);
  
  g_free (s);

  return i == 1;
}

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static gboolean
write_icon_data (FILE *cache, IconData *icon_data, int offset)
{
  int ofs = offset + 12;
  int j;
  int tmp, tmp2;

  if (icon_data->has_embedded_rect)
    {
      if (!write_card32 (cache, ofs))
        return FALSE;
	      
       ofs += 8;
    }	      
  else
    {
      if (!write_card32 (cache, 0))
        return FALSE;
    }
	      
  if (icon_data->n_attach_points > 0)
    {
      if (!write_card32 (cache, ofs))
        return FALSE;

      ofs += 4 + 4 * icon_data->n_attach_points;
    }
  else
    {
      if (!write_card32 (cache, 0))
        return FALSE;
    }

  if (icon_data->n_display_names > 0)
    {
      if (!write_card32 (cache, ofs))
	return FALSE;
    }
  else
    {
      if (!write_card32 (cache, 0))
        return FALSE;
    }

  if (icon_data->has_embedded_rect)
    {
      if (!write_card16 (cache, icon_data->x0) ||
          !write_card16 (cache, icon_data->y0) ||
	  !write_card16 (cache, icon_data->x1) ||
	  !write_card16 (cache, icon_data->y1))
        return FALSE;
    }

  if (icon_data->n_attach_points > 0)
    {
      if (!write_card32 (cache, icon_data->n_attach_points))
        return FALSE;
		  
      for (j = 0; j < 2 * icon_data->n_attach_points; j++)
        {
          if (!write_card16 (cache, icon_data->attach_points[j]))
            return FALSE;
        }		  
    }

  if (icon_data->n_display_names > 0)
    {
      if (!write_card32 (cache, icon_data->n_display_names))
        return FALSE;

      ofs += 4 + 8 * icon_data->n_display_names;

      tmp = ofs;
      for (j = 0; j < 2 * icon_data->n_display_names; j++)
        {
          tmp2 = find_string (icon_data->display_names[j]);
          if (tmp2 == 0 || tmp2 == -1)
            {
              tmp2 = tmp;
              tmp += ALIGN_VALUE (strlen (icon_data->display_names[j]) + 1, 4);
              /* We're playing a little game with negative
               * offsets here to handle duplicate strings in 
               * the array.
               */
              add_string (icon_data->display_names[j], -tmp2);
            }
          else if (tmp2 < 0)
            {
              tmp2 = -tmp2;
            }

          if (!write_card32 (cache, tmp2))
            return FALSE;

        }

      g_assert (ofs == ftell (cache));
      for (j = 0; j < 2 * icon_data->n_display_names; j++)
        {
          tmp2 = find_string (icon_data->display_names[j]);
          g_assert (tmp2 != 0 && tmp2 != -1);
          if (tmp2 < 0)
            {
              tmp2 = -tmp2;
              g_assert (tmp2 == ftell (cache));
              add_string (icon_data->display_names[j], tmp2);
              if (!write_string (cache, icon_data->display_names[j]))
                return FALSE;
            }
        }
    }	     

  return TRUE;
}

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static gboolean
write_header (FILE *cache, guint32 dir_list_offset)
{
  return (write_card16 (cache, MAJOR_VERSION) &&
	  write_card16 (cache, MINOR_VERSION) &&
	  write_card32 (cache, HASH_OFFSET) &&
	  write_card32 (cache, dir_list_offset));
}

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static gint
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get_image_meta_data_size (Image *image)
{
  gint i;

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  /* The complication with storing the size in both
   * IconData and Image is necessary since we attribute
   * the size of the IconData only to the first Image
   * using it (at which time it is written out in the 
   * cache). Later Images just refer to the written out
   * IconData via the offset.
   */
  if (image->icon_data_size == 0)
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    {
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      if (image->icon_data && image->icon_data->size < 0)
	{
          IconData *data = image->icon_data;

          data->size = 0;

          if (data->has_embedded_rect ||
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              data->n_attach_points > 0 ||
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              data->n_display_names > 0)
            data->size += 12;

          if (data->has_embedded_rect)
            data->size += 8;

          if (data->n_attach_points > 0)
            data->size += 4 + data->n_attach_points * 4;

          if (data->n_display_names > 0)
            {
              data->size += 4 + 8 * data->n_display_names;

              for (i = 0; data->display_names[i]; i++)
                { 
                  int poolv;
                  if ((poolv = find_string (data->display_names[i])) == 0)
                    {
                      data->size += ALIGN_VALUE (strlen (data->display_names[i]) + 1, 4);
                      /* Adding the string to the pool with -1
                       * to indicate that it hasn't been written out
                       * to the cache yet. We still need it in the
                       * pool in case the same string occurs twice
                       * during a get_single_node_size() calculation.
                       */
                      add_string (data->display_names[i], -1);
                    }
                }
           } 

	  image->icon_data_size = data->size;
	  data->size = 0;
	}
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    }

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  g_assert (image->icon_data_size % 4 == 0);

  return image->icon_data_size;
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}

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static gint
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get_image_pixel_data_size (Image *image)
{
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  /* The complication with storing the size in both
   * ImageData and Image is necessary since we attribute
   * the size of the ImageData only to the first Image
   * using it (at which time it is written out in the 
   * cache). Later Images just refer to the written out
   * ImageData via the offset.
   */
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  if (image->pixel_data_size == 0)
    {
      if (image->image_data && 
	  image->image_data->has_pixdata)
	{
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	  image->pixel_data_size = image->image_data->size;
	  image->image_data->size = 0;
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	}
    }
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  g_assert (image->pixel_data_size % 4 == 0);

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  return image->pixel_data_size;
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}
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static gint
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get_image_data_size (Image *image)
{
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  gint len;
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  len = 0;

  len += get_image_pixel_data_size (image);
  len += get_image_meta_data_size (image);
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  /* Even if len is zero, we need to reserve space to
   * write the ImageData, unless this is an .svg without 
   * .icon, in which case both image_data and icon_data
   * are NULL.
   */
  if (len > 0 || image->image_data || image->icon_data)
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    len += 8;

  return len;
}

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static void
get_single_node_size (HashNode *node, int *node_size, int *image_data_size)
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{
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  GList *list;
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  /* Node pointers */
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  *node_size = 12;
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  /* Name */
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  if (find_string (node->name) == 0)
    {
      *node_size += ALIGN_VALUE (strlen (node->name) + 1, 4);
      add_string (node->name, -1);
    }
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  /* Image list */
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  *node_size += 4 + g_list_length (node->image_list) * 8;
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  /* Image data */
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  *image_data_size = 0;
  for (list = node->image_list; list; list = list->next)
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    {
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      Image *image = list->data;
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      *image_data_size += get_image_data_size (image);
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    }
}

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static gboolean
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write_bucket (FILE *cache, HashNode *node, int *offset)
{
  while (node != NULL)
    {
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      int node_size, image_data_size;
      int next_offset, image_data_offset;
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      int data_offset;
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      int name_offset;
      int name_size;
      int image_list_offset;
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      int tmp;
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      int i, len;
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      GList *list;
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      g_assert (*offset == ftell (cache));

      node->offset = *offset;
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      get_single_node_size (node, &node_size, &image_data_size);
      g_assert (node_size % 4 == 0);
      g_assert (image_data_size % 4 == 0);
      image_data_offset = *offset + node_size;
      next_offset = *offset + node_size + image_data_size;
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      /* Chain offset */
      if (node->next != NULL)
	{
	  if (!write_card32 (cache, next_offset))
	    return FALSE;
	}
      else
	{
	  if (!write_card32 (cache, 0xffffffff))
	    return FALSE;
	}
      
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      name_size = 0;
      name_offset = find_string (node->name);
      if (name_offset <= 0)
        {
          name_offset = *offset + 12;
          name_size = ALIGN_VALUE (strlen (node->name) + 1, 4);
          add_string (node->name, name_offset);
        }
      if (!write_card32 (cache, name_offset))
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	return FALSE;
      
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      image_list_offset = *offset + 12 + name_size;
      if (!write_card32 (cache, image_list_offset))
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	return FALSE;
      
      /* Icon name */
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      if (name_size > 0)
        {
          if (!write_string (cache, node->name))
	    return FALSE;
        }

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      /* Image list */
      len = g_list_length (node->image_list);
      if (!write_card32 (cache, len))
	return FALSE;
      
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      /* Image data goes right after the image list */
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      tmp = image_list_offset + 4 + len * 8;
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      list = node->image_list;
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      data_offset = image_data_offset;
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      for (i = 0; i < len; i++)
	{
	  Image *image = list->data;
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	  int image_data_size = get_image_data_size (image);
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	  /* Directory index */
	  if (!write_card16 (cache, image->dir_index))
	    return FALSE;
	  
	  /* Flags */
	  if (!write_card16 (cache, image->flags))
	    return FALSE;
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	  /* Image data offset */
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	  if (image_data_size > 0)
	    {
	      if (!write_card32 (cache, data_offset))
		return FALSE;
	      data_offset += image_data_size;
	    }
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	  else 
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	    {
	      if (!write_card32 (cache, 0))
		return FALSE;
	    }

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	  list = list->next;
	}

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      /* Now write the image data */
      list = node->image_list;
      for (i = 0; i < len; i++, list = list->next)
	{
	  Image *image = list->data;
	  int pixel_data_size = get_image_pixel_data_size (image);
	  int meta_data_size = get_image_meta_data_size (image);

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	  if (get_image_data_size (image) == 0)
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	    continue;

	  /* Pixel data */
	  if (pixel_data_size > 0) 
	    {
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	      image->image_data->offset = image_data_offset + 8;
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	      if (!write_card32 (cache, image->image_data->offset))
		return FALSE;
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	    }
	  else
	    {
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	      if (!write_card32 (cache, (guint32) (image->image_data ? image->image_data->offset : 0)))
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		return FALSE;
	    }

	  if (meta_data_size > 0)
	    {
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	      image->icon_data->offset = image_data_offset + pixel_data_size + 8;
	      if (!write_card32 (cache, image->icon_data->offset))
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		return FALSE;
	    }
	  else
	    {
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	      if (!write_card32 (cache, image->icon_data ? image->icon_data->offset : 0))
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		return FALSE;
	    }

	  if (pixel_data_size > 0)
	    {
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	      if (!write_image_data (cache, image->image_data, image->image_data->offset))
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		return FALSE;
	    }
	  
	  if (meta_data_size > 0)
	    {
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              if (!write_icon_data (cache, image->icon_data, image->icon_data->offset))
                return FALSE;
            }
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	  image_data_offset += pixel_data_size + meta_data_size + 8;
	}
      
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      *offset = next_offset;
      node = node->next;
    }
  
  return TRUE;
}

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static gboolean
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write_hash_table (FILE *cache, HashContext *context, int *new_offset)
{
  int offset = HASH_OFFSET;
  int node_offset;
  int i;

  if (!(write_card32 (cache, context->size)))
    return FALSE;

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  offset += 4;
  node_offset = offset + context->size * 4;
  /* Just write zeros here, we will rewrite this later */  
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  for (i = 0; i < context->size; i++)
    {
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      if (!write_card32 (cache, 0))
	return FALSE;
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    }

  /* Now write the buckets */
  for (i = 0; i < context->size; i++)
    {
      if (!context->nodes[i])
	continue;

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      g_assert (node_offset % 4 == 0);
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      if (!write_bucket (cache, context->nodes[i], &node_offset))
	return FALSE;
    }

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  *new_offset = node_offset;

  /* Now write out the bucket offsets */

  fseek (cache, offset, SEEK_SET);

  for (i = 0; i < context->size; i++)
    {
      if (context->nodes[i] != NULL)
        node_offset = context->nodes[i]->offset;
      else
	node_offset = 0xffffffff;
      if (!write_card32 (cache, node_offset))
        return FALSE;
    }

  fseek (cache, 0, SEEK_END);

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  return TRUE;
}