/* GIMP - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h>
#include <string.h>

#include <cairo.h>
#include <gegl.h>

#include "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"

#include "core/core-types.h"

#include "base/tile.h"
#include "base/tile-manager.h"
#include "base/tile-manager-private.h"

#include "config/gimpcoreconfig.h"

#include "core/gimp.h"
#include "core/gimpcontainer.h"
#include "core/gimpdrawable-private.h" /* eek */
#include "core/gimpgrid.h"
#include "core/gimpgrouplayer.h"
#include "core/gimpimage.h"
#include "core/gimpimage-colormap.h"
#include "core/gimpimage-grid.h"
#include "core/gimpimage-guides.h"
#include "core/gimpimage-private.h"
#include "core/gimpimage-sample-points.h"
#include "core/gimpimage-undo.h"
#include "core/gimpitemstack.h"
#include "core/gimplayer-floating-sel.h"
#include "core/gimplayermask.h"
#include "core/gimpparasitelist.h"
#include "core/gimpprogress.h"
#include "core/gimpselection.h"
#include "core/gimptemplate.h"

#include "text/gimptextlayer.h"
#include "text/gimptextlayer-xcf.h"

#include "vectors/gimpanchor.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpbezierstroke.h"
#include "vectors/gimpvectors.h"
#include "vectors/gimpvectors-compat.h"

#include "xcf-private.h"
#include "xcf-load.h"
#include "xcf-read.h"
#include "xcf-seek.h"

#include "gimp-intl.h"


/**
 * SECTION:xcf-load
 * @Short_description:XCF file loader functions
 *
 * XCF file loader
 */

#define MAX_XCF_PARASITE_DATA_LEN (256L * 1024 * 1024)

/* #define GIMP_XCF_PATH_DEBUG */


static void            xcf_load_add_masks     (GimpImage    *image);
static gboolean        xcf_load_image_props   (XcfInfo      *info,
                                               GimpImage    *image);
static gboolean        xcf_load_layer_props   (XcfInfo      *info,
                                               GimpImage    *image,
                                               GimpLayer   **layer,
                                               GList       **item_path,
                                               gboolean     *apply_mask,
                                               gboolean     *edit_mask,
                                               gboolean     *show_mask,
                                               guint32      *text_layer_flags,
                                               guint32      *group_layer_flags);
static gboolean        xcf_load_channel_props (XcfInfo      *info,
                                               GimpImage    *image,
                                               GimpChannel **channel);
static gboolean        xcf_load_prop          (XcfInfo      *info,
                                               PropType     *prop_type,
                                               guint32      *prop_size);
static GimpLayer     * xcf_load_layer         (XcfInfo      *info,
                                               GimpImage    *image,
                                               GList       **item_path);
static GimpChannel   * xcf_load_channel       (XcfInfo      *info,
                                               GimpImage    *image);
static GimpLayerMask * xcf_load_layer_mask    (XcfInfo      *info,
                                               GimpImage    *image);
static gboolean        xcf_load_hierarchy     (XcfInfo      *info,
                                               TileManager  *tiles);
static gboolean        xcf_load_level         (XcfInfo      *info,
                                               TileManager  *tiles);
static gboolean        xcf_load_tile          (XcfInfo      *info,
                                               Tile         *tile);
static gboolean        xcf_load_tile_rle      (XcfInfo      *info,
                                               Tile         *tile,
                                               gint          data_length);
static GimpParasite  * xcf_load_parasite      (XcfInfo      *info);
static gboolean        xcf_load_old_paths     (XcfInfo      *info,
                                               GimpImage    *image);
static gboolean        xcf_load_old_path      (XcfInfo      *info,
                                               GimpImage    *image);
static gboolean        xcf_load_vectors       (XcfInfo      *info,
                                               GimpImage    *image);
static gboolean        xcf_load_vector        (XcfInfo      *info,
                                               GimpImage    *image);

static gboolean        xcf_skip_unknown_prop  (XcfInfo      *info,
                                               gsize         size);
static gboolean        xcf_find_layer_offset_table (XcfInfo *info,
                                                    glong    offset);


#define xcf_progress_update(info) G_STMT_START  \
  {                                             \
    if (info->progress)                         \
      gimp_progress_pulse (info->progress);     \
  } G_STMT_END


/**
 * xcf_load_image:
 * @gimp:  #Gimp instance
 * @info:  #XcfInfo structure of the file to open
 * @error: Return location for hard errors
 *
 * Loads an image from an XCF file.
 *
 * Returns: Image of type #GimpImage with the loaded content from the XCF file
 *          or %NULL if a hard error occurred.
 * On hard errors, @error will contain the occurred error and %NULL be returned.
 *
 */
GimpImage *
xcf_load_image (Gimp     *gimp,
                XcfInfo  *info,
                GError  **error)
{
  GimpImage          *image = NULL;
  const GimpParasite *parasite;
  guint32             saved_pos;
  guint32             offset;
  gint                width;
  gint                height;
  gint                image_type;
  gint                num_successful_elements = 0;
  guint32             retry_offset;
  gboolean            retried                 = FALSE;
  gboolean            terminate_loop            = FALSE;

  /* read in the image width, height and type */
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &image_type, 1);
  if (image_type < GIMP_RGB || image_type > GIMP_INDEXED ||
      width <= 0 || height <= 0)
    goto hard_error;

  image = gimp_create_image (gimp, width, height, image_type, FALSE);

  gimp_image_undo_disable (image);

  xcf_progress_update (info);

  /* read the image properties */
  if (! xcf_load_image_props (info, image))
    goto hard_error;

  /* check for a GimpGrid parasite */
  parasite = gimp_image_parasite_find (GIMP_IMAGE (image),
                                       gimp_grid_parasite_name ());
  if (parasite)
    {
      GimpGrid *grid = gimp_grid_from_parasite (parasite);

      if (grid)
        {
          GimpImagePrivate *private = GIMP_IMAGE_GET_PRIVATE (image);

          gimp_parasite_list_remove (private->parasites,
                                     gimp_parasite_name (parasite));

          gimp_image_set_grid (GIMP_IMAGE (image), grid, FALSE);
          g_object_unref (grid);
        }
    }

  xcf_progress_update (info);

  retry_offset = info->cp;

  /* read in layers and channels; retry one time when they are accidently
   * shifted in the file (see bug #730211)
   */
  while (! terminate_loop)
    {
      while (TRUE)
        {
          GimpLayer *layer;
          GList     *item_path = NULL;

          /* read in the offset of the next layer */
          info->cp += xcf_read_int32 (info->fp, &offset, 1);

          /* if the offset is 0 then we are at the end
           *  of the layer list.
           */
          if (offset == 0)
            break;

          /* save the current position as it is where the
           *  next layer offset is stored.
           */
          saved_pos = info->cp;

          /* seek to the layer offset */
          if (! xcf_seek_pos (info, offset, NULL))
            goto error;

          /* read in the layer */
          layer = xcf_load_layer (info, image, &item_path);
          if (!layer)
            goto error;

          num_successful_elements++;

          xcf_progress_update (info);

          /* add the layer to the image if its not the floating selection */
          if (layer != info->floating_sel)
            {
              GimpContainer *layers = gimp_image_get_layers (image);
              GimpContainer *container;
              GimpLayer     *parent;

              if (item_path)
                {
                  if (info->floating_sel)
                    {
                      /* there is a floating selection, but it will get
                       * added after all layers are loaded, so toplevel
                       * layer indices are off-by-one. Adjust item paths
                       * accordingly:
                       */
                      gint toplevel_index;

                      toplevel_index = GPOINTER_TO_UINT (item_path->data);

                      toplevel_index--;

                      item_path->data = GUINT_TO_POINTER (toplevel_index);
                    }

                  parent = GIMP_LAYER
                    (gimp_item_stack_get_parent_by_path (GIMP_ITEM_STACK (layers),
                                                         item_path,
                                                         NULL));

                  container = gimp_viewable_get_children (GIMP_VIEWABLE (parent));

                  g_list_free (item_path);
                }
              else
                {
                  parent    = NULL;
                  container = layers;
                }

              gimp_image_add_layer (image, layer,
                                    parent,
                                    gimp_container_get_n_children (container),
                                    FALSE);
            }

          /* restore the saved position so we'll be ready to
           *  read the next offset.
           */
          if (! xcf_seek_pos (info, saved_pos, NULL))
            goto error;
        } /* read layers */

      /* read channels */
      while (TRUE)
        {
          GimpChannel *channel;

          /* read in the offset of the next channel */
          info->cp += xcf_read_int32 (info->fp, &offset, 1);

          /* If the offset is 0, then we are at the end of the channel list. */
          if (offset == 0)
            break;

          /* save the current position as it is where the
           * next channel offset is stored.
           */
          saved_pos = info->cp;

          /* seek to the channel offset */
          if (! xcf_seek_pos (info, offset, NULL))
            goto error;

          /* read in the channel */
          channel = xcf_load_channel (info, image);
          if (!channel)
            goto error;

          num_successful_elements++;

          xcf_progress_update (info);

          /* add the channel to the image if its not the selection */
          if (channel != gimp_image_get_mask (image))
            gimp_image_add_channel (image, channel,
                                    NULL, /* FIXME tree */
                                    gimp_container_get_n_children (gimp_image_get_channels (image)),
                                    FALSE);

          /* restore the saved position so we'll be ready to
           *  read the next offset.
           */
          if (! xcf_seek_pos (info, saved_pos, NULL))
            goto error;
        } /* read channels */

      terminate_loop =
          (num_successful_elements > 0) ||
          retried ||
          (! xcf_find_layer_offset_table (info, retry_offset));

      if (! terminate_loop)
        retried = TRUE;
/*
      if (num_successful_elements == 0 && !retried)
        {
          if (xcf_find_layer_offset_table (info, retry_offset))
            {
              retried = TRUE;
              goto retry;
            }
        }
*/
    } /* while (! terminate_loop) */

  xcf_load_add_masks (image);

  if (info->floating_sel && info->floating_sel_drawable)
    floating_sel_attach (info->floating_sel, info->floating_sel_drawable);

  if (info->active_layer)
    gimp_image_set_active_layer (image, info->active_layer);

  if (info->active_channel)
    gimp_image_set_active_channel (image, info->active_channel);

  gimp_image_set_filename (image, info->filename);

  if (info->tattoo_state > 0)
    gimp_image_set_tattoo_state (image, info->tattoo_state);

  gimp_image_undo_enable (image);

  return image;

 error:
  if (num_successful_elements == 0)
    goto hard_error;

  gimp_message_literal (gimp, G_OBJECT (info->progress), GIMP_MESSAGE_WARNING,
			_("This XCF file is corrupt!  I have loaded as much "
			  "of it as I can, but it is incomplete."));

  xcf_load_add_masks (image);

  gimp_image_undo_enable (image);

  return image;

 hard_error:
  g_set_error_literal (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
		       _("This XCF file is corrupt!  I could not even "
			 "salvage any partial image data from it."));

  if (image)
    g_object_unref (image);

  return NULL;
}

static void
xcf_load_add_masks (GimpImage *image)
{
  GList *layers;
  GList *list;

  layers = gimp_image_get_layer_list (image);

  for (list = layers; list; list = g_list_next (list))
    {
      GimpLayer     *layer = list->data;
      GimpLayerMask *mask;

      mask = g_object_get_data (G_OBJECT (layer), "gimp-layer-mask");

      if (mask)
        {
          gimp_layer_add_mask (layer, mask, FALSE, NULL);

          g_object_set_data (G_OBJECT (layer), "gimp-layer-mask", NULL);
        }
    }

  g_list_free (layers);
}

static gboolean
xcf_load_image_props (XcfInfo   *info,
                      GimpImage *image)
{
  PropType prop_type;
  guint32  prop_size;

  while (TRUE)
    {
      if (! xcf_load_prop (info, &prop_type, &prop_size))
        return FALSE;

      switch (prop_type)
        {
        case PROP_END:
          return TRUE;

        case PROP_COLORMAP:
          {
            guint32 n_colors;
            guchar  cmap[GIMP_IMAGE_COLORMAP_SIZE];

            info->cp += xcf_read_int32 (info->fp, &n_colors, 1);

            if (n_colors > (GIMP_IMAGE_COLORMAP_SIZE / 3))
              {
                gimp_message (info->gimp, G_OBJECT (info->progress),
                              GIMP_MESSAGE_ERROR,
                              "Maximum colormap size (%d) exceeded",
			      GIMP_IMAGE_COLORMAP_SIZE);
                return FALSE;
              }

            if (info->file_version == 0)
              {
                gint i;

                gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				      GIMP_MESSAGE_WARNING,
				      _("XCF warning: version 0 of XCF file format\n"
					"did not save indexed colormaps correctly.\n"
					"Substituting grayscale map."));

                if (! xcf_seek_pos (info, info->cp + n_colors, NULL))
                  return FALSE;

                for (i = 0; i < n_colors; i++)
                  {
                    cmap[i * 3 + 0] = i;
                    cmap[i * 3 + 1] = i;
                    cmap[i * 3 + 2] = i;
                  }
              }
            else
              {
                info->cp += xcf_read_int8 (info->fp, cmap, n_colors * 3);
              }

            /* only set color map if image is not indexed, this is
             * just sanity checking to make sure gimp doesn't end up
             * with an image state that is impossible.
             */
            if (gimp_image_base_type (image) == GIMP_INDEXED)
              gimp_image_set_colormap (image, cmap, n_colors, FALSE);
          }
          break;

        case PROP_COMPRESSION:
          {
            guint8 compression;

            info->cp += xcf_read_int8 (info->fp, (guint8 *) &compression, 1);

            if ((compression != COMPRESS_NONE) &&
                (compression != COMPRESS_RLE) &&
                (compression != COMPRESS_ZLIB) &&
                (compression != COMPRESS_FRACTAL))
              {
                gimp_message (info->gimp, G_OBJECT (info->progress),
                              GIMP_MESSAGE_ERROR,
                              "Unknown compression type: %d",
			      (gint) compression);
                return FALSE;
              }

            info->compression = compression;
          }
          break;

        case PROP_GUIDES:
          {
            GimpImagePrivate *private = GIMP_IMAGE_GET_PRIVATE (image);
            gint32            position;
            gint8             orientation;
            gint              i, nguides;

            nguides = prop_size / (4 + 1);
            for (i = 0; i < nguides; i++)
              {
                info->cp += xcf_read_int32 (info->fp,
                                            (guint32 *) &position, 1);
                info->cp += xcf_read_int8 (info->fp,
                                           (guint8 *) &orientation, 1);

                /*  skip -1 guides from old XCFs  */
                if (position < 0)
                  continue;

                switch (orientation)
                  {
                  case XCF_ORIENTATION_HORIZONTAL:
                    gimp_image_add_hguide (image, position, FALSE);
                    break;

                  case XCF_ORIENTATION_VERTICAL:
                    gimp_image_add_vguide (image, position, FALSE);
                    break;

                  default:
                    gimp_message_literal (info->gimp, G_OBJECT (info->progress),
					  GIMP_MESSAGE_WARNING,
					  "Guide orientation out of range in XCF file");
                    continue;
                  }
              }

            /*  this is silly as the order of guides doesn't really matter,
             *  but it restores the list to its original order, which
             *  cannot be wrong  --Mitch
             */
            private->guides = g_list_reverse (private->guides);
          }
          break;

        case PROP_SAMPLE_POINTS:
          {
            gint32 x, y;
            gint   i, n_sample_points;

            n_sample_points = prop_size / (4 + 4);
            for (i = 0; i < n_sample_points; i++)
              {
                info->cp += xcf_read_int32 (info->fp, (guint32 *) &x, 1);
                info->cp += xcf_read_int32 (info->fp, (guint32 *) &y, 1);

                gimp_image_add_sample_point_at_pos (image, x, y, FALSE);
              }
          }
          break;

        case PROP_RESOLUTION:
          {
            gfloat xres, yres;

            info->cp += xcf_read_float (info->fp, &xres, 1);
            info->cp += xcf_read_float (info->fp, &yres, 1);

            if (xres < GIMP_MIN_RESOLUTION || xres > GIMP_MAX_RESOLUTION ||
                yres < GIMP_MIN_RESOLUTION || yres > GIMP_MAX_RESOLUTION)
              {
                GimpTemplate *template = image->gimp->config->default_image;

                gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				      GIMP_MESSAGE_WARNING,
				      "Warning, resolution out of range in XCF file");
                xres = gimp_template_get_resolution_x (template);
                yres = gimp_template_get_resolution_y (template);
              }

            gimp_image_set_resolution (image, xres, yres);
          }
          break;

        case PROP_TATTOO:
          {
            info->cp += xcf_read_int32 (info->fp, &info->tattoo_state, 1);
          }
          break;

        case PROP_PARASITES:
          {
            glong base = info->cp;

            while (info->cp - base < prop_size)
              {
                GimpParasite *p = xcf_load_parasite (info);

                if (! p)
                  return FALSE;

                gimp_image_parasite_attach (image, p);
                gimp_parasite_free (p);
              }

            if (info->cp - base != prop_size)
              gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				    GIMP_MESSAGE_WARNING,
				    "Error while loading an image's parasites");
          }
          break;

        case PROP_UNIT:
          {
            guint32 unit;

            info->cp += xcf_read_int32 (info->fp, &unit, 1);

            if ((unit <= GIMP_UNIT_PIXEL) ||
                (unit >= gimp_unit_get_number_of_built_in_units ()))
              {
                gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				      GIMP_MESSAGE_WARNING,
				      "Warning, unit out of range in XCF file, "
				      "falling back to inches");
                unit = GIMP_UNIT_INCH;
              }

            gimp_image_set_unit (image, unit);
          }
          break;

        case PROP_PATHS:
          xcf_load_old_paths (info, image);
          break;

        case PROP_USER_UNIT:
          {
            gchar    *unit_strings[5];
            float     factor;
            guint32   digits;
            GimpUnit  unit;
            gint      num_units;
            gint      i;

            info->cp += xcf_read_float (info->fp, &factor, 1);
            info->cp += xcf_read_int32 (info->fp, &digits, 1);
            info->cp += xcf_read_string (info->fp, unit_strings, 5);

            for (i = 0; i < 5; i++)
              if (unit_strings[i] == NULL)
                unit_strings[i] = g_strdup ("");

            num_units = gimp_unit_get_number_of_units ();

            for (unit = gimp_unit_get_number_of_built_in_units ();
                 unit < num_units; unit++)
              {
                /* if the factor and the identifier match some unit
                 * in unitrc, use the unitrc unit
                 */
                if ((ABS (gimp_unit_get_factor (unit) - factor) < 1e-5) &&
                    (strcmp (unit_strings[0],
                             gimp_unit_get_identifier (unit)) == 0))
                  {
                    break;
                  }
              }

            /* no match */
            if (unit == num_units)
              unit = gimp_unit_new (unit_strings[0],
                                    factor,
                                    digits,
                                    unit_strings[1],
                                    unit_strings[2],
                                    unit_strings[3],
                                    unit_strings[4]);

            gimp_image_set_unit (image, unit);

            for (i = 0; i < 5; i++)
              g_free (unit_strings[i]);
          }
         break;

        case PROP_VECTORS:
          {
            guint32 base = info->cp;

            if (xcf_load_vectors (info, image))
              {
                if (base + prop_size != info->cp)
                  {
                    g_printerr ("Mismatch in PROP_VECTORS size: "
                                "skipping %d bytes.\n",
                                base + prop_size - info->cp);
                    xcf_seek_pos (info, base + prop_size, NULL);
                  }
              }
            else
              {
                /* skip silently since we don't understand the format and
                 * xcf_load_vectors already explained what was wrong
                 */
                xcf_seek_pos (info, base + prop_size, NULL);
              }
          }
          break;

        default:
#ifdef GIMP_UNSTABLE
          g_printerr ("unexpected/unknown image property: %d (skipping)\n",
                      prop_type);
#endif
          if (! xcf_skip_unknown_prop (info, prop_size))
            return FALSE;
          break;
        }
    }

  return FALSE;
}

static gboolean
xcf_load_layer_props (XcfInfo    *info,
                      GimpImage  *image,
                      GimpLayer **layer,
                      GList     **item_path,
                      gboolean   *apply_mask,
                      gboolean   *edit_mask,
                      gboolean   *show_mask,
                      guint32    *text_layer_flags,
                      guint32    *group_layer_flags)
{
  PropType prop_type;
  guint32  prop_size;

  while (TRUE)
    {
      if (! xcf_load_prop (info, &prop_type, &prop_size))
        return FALSE;

      switch (prop_type)
        {
        case PROP_END:
          return TRUE;

        case PROP_ACTIVE_LAYER:
          info->active_layer = *layer;
          break;

        case PROP_FLOATING_SELECTION:
          info->floating_sel = *layer;
          info->cp +=
            xcf_read_int32 (info->fp,
                            (guint32 *) &info->floating_sel_offset, 1);
          break;

        case PROP_OPACITY:
          {
            guint32 opacity;

            info->cp += xcf_read_int32 (info->fp, &opacity, 1);
            gimp_layer_set_opacity (*layer, (gdouble) opacity / 255.0, FALSE);
          }
          break;

        case PROP_VISIBLE:
          {
            gboolean visible;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &visible, 1);
            gimp_item_set_visible (GIMP_ITEM (*layer), visible, FALSE);
          }
          break;

        case PROP_LINKED:
          {
            gboolean linked;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &linked, 1);
            gimp_item_set_linked (GIMP_ITEM (*layer), linked, FALSE);
          }
          break;

        case PROP_LOCK_CONTENT:
          {
            gboolean lock_content;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &lock_content, 1);

            if (gimp_item_can_lock_content (GIMP_ITEM (*layer)))
              gimp_item_set_lock_content (GIMP_ITEM (*layer),
                                          lock_content, FALSE);
          }
          break;

        case PROP_LOCK_ALPHA:
          {
            gboolean lock_alpha;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &lock_alpha, 1);

            if (gimp_layer_can_lock_alpha (*layer))
              gimp_layer_set_lock_alpha (*layer, lock_alpha, FALSE);
          }
          break;

        case PROP_APPLY_MASK:
          info->cp += xcf_read_int32 (info->fp, (guint32 *) apply_mask, 1);
          break;

        case PROP_EDIT_MASK:
          info->cp += xcf_read_int32 (info->fp, (guint32 *) edit_mask, 1);
          break;

        case PROP_SHOW_MASK:
          info->cp += xcf_read_int32 (info->fp, (guint32 *) show_mask, 1);
          break;

        case PROP_OFFSETS:
          {
            guint32 offset_x;
            guint32 offset_y;

            info->cp += xcf_read_int32 (info->fp, &offset_x, 1);
            info->cp += xcf_read_int32 (info->fp, &offset_y, 1);

            gimp_item_set_offset (GIMP_ITEM (*layer), offset_x, offset_y);
          }
          break;

        case PROP_MODE:
          {
            guint32 mode;

            info->cp += xcf_read_int32 (info->fp, &mode, 1);
            gimp_layer_set_mode (*layer, (GimpLayerModeEffects) mode, FALSE);
          }
          break;

        case PROP_TATTOO:
          {
            GimpTattoo tattoo;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &tattoo, 1);
            gimp_item_set_tattoo (GIMP_ITEM (*layer), tattoo);
          }
          break;

        case PROP_PARASITES:
          {
            glong base = info->cp;

            while (info->cp - base < prop_size)
              {
                GimpParasite *p = xcf_load_parasite (info);

                if (! p)
                  return FALSE;

                gimp_item_parasite_attach (GIMP_ITEM (*layer), p, FALSE);
                gimp_parasite_free (p);
              }

            if (info->cp - base != prop_size)
              gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				    GIMP_MESSAGE_WARNING,
				    "Error while loading a layer's parasites");
          }
          break;

        case PROP_TEXT_LAYER_FLAGS:
          info->cp += xcf_read_int32 (info->fp, text_layer_flags, 1);
          break;

        case PROP_GROUP_ITEM:
          {
            GimpLayer *group;
            gboolean   is_active_layer;

            /* We're going to delete *layer, Don't leave its pointers
             * in @info.  After that, we'll restore them back with the
             * new pointer. See bug #767873.
             */
            is_active_layer = (*layer == info->active_layer);
            if (is_active_layer)
              info->active_layer = NULL;

            if (*layer == info->floating_sel)
              info->floating_sel = NULL;

            group = gimp_group_layer_new (image);

            gimp_object_set_name (GIMP_OBJECT (group),
                                  gimp_object_get_name (*layer));

            GIMP_DRAWABLE (group)->private->type =
              gimp_drawable_type (GIMP_DRAWABLE (*layer));

            g_object_ref_sink (*layer);
            g_object_unref (*layer);
            *layer = group;

            if (is_active_layer)
              info->active_layer = *layer;

            /* Don't restore info->floating_sel because group layers
             * can't be floating selections
             */
          }
          break;

        case PROP_ITEM_PATH:
          {
            glong  base = info->cp;
            GList *path = NULL;

            while (info->cp - base < prop_size)
              {
                guint32 index;

                if (xcf_read_int32 (info->fp, &index, 1) != 4)
                  {
                    g_list_free (path);
                    return FALSE;
                  }

                info->cp += 4;
                path = g_list_append (path, GUINT_TO_POINTER (index));
              }

            *item_path = path;
          }
          break;

        case PROP_GROUP_ITEM_FLAGS:
          info->cp += xcf_read_int32 (info->fp, group_layer_flags, 1);
          break;

        default:
#ifdef GIMP_UNSTABLE
          g_printerr ("unexpected/unknown layer property: %d (skipping)\n",
                      prop_type);
#endif
          if (! xcf_skip_unknown_prop (info, prop_size))
            return FALSE;
          break;
        }
    }

  return FALSE;
}

static gboolean
xcf_load_channel_props (XcfInfo      *info,
                        GimpImage    *image,
                        GimpChannel **channel)
{
  PropType prop_type;
  guint32  prop_size;

  while (TRUE)
    {
      if (! xcf_load_prop (info, &prop_type, &prop_size))
        return FALSE;

      switch (prop_type)
        {
        case PROP_END:
          return TRUE;

        case PROP_ACTIVE_CHANNEL:
          info->active_channel = *channel;
          break;

        case PROP_SELECTION:
          {
            GimpChannel *mask;

            /* We're going to delete *channel, Don't leave its pointer
             * in @info. See bug #767873.
             */
            if (*channel == info->active_channel)
              info->active_channel = NULL;

            mask =
              gimp_selection_new (image,
                                  gimp_item_get_width  (GIMP_ITEM (*channel)),
                                  gimp_item_get_height (GIMP_ITEM (*channel)));
            gimp_image_take_mask (image, mask);

            tile_manager_unref (GIMP_DRAWABLE (mask)->private->tiles);
            GIMP_DRAWABLE (mask)->private->tiles =
              GIMP_DRAWABLE (*channel)->private->tiles;
            GIMP_DRAWABLE (*channel)->private->tiles = NULL;
            g_object_unref (*channel);
            *channel = mask;
            (*channel)->boundary_known = FALSE;
            (*channel)->bounds_known   = FALSE;

            /* Don't restore info->active_channel because the
             * selection can't be the active channel
             */
          }
          break;

        case PROP_OPACITY:
          {
            guint32 opacity;

            info->cp += xcf_read_int32 (info->fp, &opacity, 1);
            gimp_channel_set_opacity (*channel, opacity / 255.0, FALSE);
          }
          break;

        case PROP_VISIBLE:
          {
            gboolean visible;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &visible, 1);
            gimp_item_set_visible (GIMP_ITEM (*channel),
                                   visible ? TRUE : FALSE, FALSE);
          }
          break;

        case PROP_LINKED:
          {
            gboolean linked;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &linked, 1);
            gimp_item_set_linked (GIMP_ITEM (*channel),
                                  linked ? TRUE : FALSE, FALSE);
          }
          break;

        case PROP_LOCK_CONTENT:
          {
            gboolean lock_content;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &lock_content, 1);
            gimp_item_set_lock_content (GIMP_ITEM (*channel),
                                        lock_content ? TRUE : FALSE, FALSE);
          }
          break;

        case PROP_SHOW_MASKED:
          {
            gboolean show_masked;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &show_masked, 1);
            gimp_channel_set_show_masked (*channel, show_masked);
          }
          break;

        case PROP_COLOR:
          {
            guchar col[3];

            info->cp += xcf_read_int8 (info->fp, (guint8 *) col, 3);
            gimp_rgb_set_uchar (&(*channel)->color, col[0], col[1], col[2]);
          }
          break;

        case PROP_TATTOO:
          {
            GimpTattoo tattoo;

            info->cp += xcf_read_int32 (info->fp, (guint32 *) &tattoo, 1);
            gimp_item_set_tattoo (GIMP_ITEM (*channel), tattoo);
          }
          break;

        case PROP_PARASITES:
          {
            glong base = info->cp;

            while ((info->cp - base) < prop_size)
              {
                GimpParasite *p = xcf_load_parasite (info);

                if (! p)
                  return FALSE;

                gimp_item_parasite_attach (GIMP_ITEM (*channel), p, FALSE);
                gimp_parasite_free (p);
              }

            if (info->cp - base != prop_size)
              gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				    GIMP_MESSAGE_WARNING,
				    "Error while loading a channel's parasites");
          }
          break;

        default:
#ifdef GIMP_UNSTABLE
          g_printerr ("unexpected/unknown channel property: %d (skipping)\n",
                      prop_type);
#endif
          if (! xcf_skip_unknown_prop (info, prop_size))
            return FALSE;
          break;
        }
    }

  return FALSE;
}

static gboolean
xcf_load_prop (XcfInfo  *info,
               PropType *prop_type,
               guint32  *prop_size)
{
  if (G_UNLIKELY (xcf_read_int32 (info->fp, (guint32 *) prop_type, 1) != 4))
    return FALSE;

  info->cp += 4;

  if (G_UNLIKELY (xcf_read_int32 (info->fp, (guint32 *) prop_size, 1) != 4))
    return FALSE;

  info->cp += 4;

  return TRUE;
}

static GimpLayer *
xcf_load_layer (XcfInfo    *info,
                GimpImage  *image,
                GList     **item_path)
{
  GimpLayer     *layer;
  GimpLayerMask *layer_mask;
  guint32        hierarchy_offset;
  guint32        layer_mask_offset;
  gboolean       apply_mask = TRUE;
  gboolean       edit_mask  = FALSE;
  gboolean       show_mask  = FALSE;
  gboolean       active;
  gboolean       floating;
  guint32        group_layer_flags = 0;
  guint32        text_layer_flags = 0;
  gint           width;
  gint           height;
  gint           type;
  gboolean       is_fs_drawable;
  gchar         *name;

  /* check and see if this is the drawable the floating selection
   *  is attached to. if it is then we'll do the attachment in our caller.
   */
  is_fs_drawable = (info->cp == info->floating_sel_offset);

  /* read in the layer width, height, type and name */
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &type, 1);
  if (width <= 0 || height <= 0)
    return NULL;

  info->cp += xcf_read_string (info->fp, &name, 1);

  /* create a new layer */
  layer = gimp_layer_new (image, width, height,
                          type, name, 255, GIMP_NORMAL_MODE);
  g_free (name);
  if (! layer)
    return NULL;

  /* read in the layer properties */
  if (! xcf_load_layer_props (info, image, &layer, item_path,
                              &apply_mask, &edit_mask, &show_mask,
                              &text_layer_flags, &group_layer_flags))
    goto error;

  xcf_progress_update (info);

  /* call the evil text layer hack that might change our layer pointer */
  active   = (info->active_layer == layer);
  floating = (info->floating_sel == layer);

  if (gimp_text_layer_xcf_load_hack (&layer))
    {
      gimp_text_layer_set_xcf_flags (GIMP_TEXT_LAYER (layer),
                                     text_layer_flags);

      if (active)
        info->active_layer = layer;
      if (floating)
        info->floating_sel = layer;
    }

  /* read the hierarchy and layer mask offsets */
  info->cp += xcf_read_int32 (info->fp, &hierarchy_offset, 1);
  info->cp += xcf_read_int32 (info->fp, &layer_mask_offset, 1);

  /* read in the hierarchy (ignore it for group layers, both as an
   * optimization and because the hierarchy's extents don't match
   * the group layer's tiles)
   */
  if (! gimp_viewable_get_children (GIMP_VIEWABLE (layer)))
    {
      if (! xcf_seek_pos (info, hierarchy_offset, NULL))
        goto error;

      if (! xcf_load_hierarchy (info,
                                gimp_drawable_get_tiles (GIMP_DRAWABLE (layer))))
        goto error;

      xcf_progress_update (info);
    }
  else
    {
      gboolean expanded = group_layer_flags & XCF_GROUP_ITEM_EXPANDED;

      gimp_viewable_set_expanded (GIMP_VIEWABLE (layer), expanded);
    }

  /* read in the layer mask */
  if (layer_mask_offset != 0)
    {
      if (! xcf_seek_pos (info, layer_mask_offset, NULL))
        goto error;

      layer_mask = xcf_load_layer_mask (info, image);
      if (! layer_mask)
        goto error;

      xcf_progress_update (info);

      gimp_layer_mask_set_apply (layer_mask, apply_mask, FALSE);
      gimp_layer_mask_set_edit  (layer_mask, edit_mask);
      gimp_layer_mask_set_show  (layer_mask, show_mask, FALSE);

      /* don't add the layer mask yet, that won't work for group
       * layers which update their size automatically; instead
       * attach it so it can be added when all layers are loaded
       */
      g_object_set_data_full (G_OBJECT (layer), "gimp-layer-mask",
                              g_object_ref_sink (layer_mask),
                              (GDestroyNotify) g_object_unref);
    }

  /* attach the floating selection... */
  if (is_fs_drawable)
    info->floating_sel_drawable = GIMP_DRAWABLE (layer);

  return layer;

 error:
  g_object_unref (layer);
  return NULL;
}

static GimpChannel *
xcf_load_channel (XcfInfo   *info,
                  GimpImage *image)
{
  GimpChannel *channel;
  guint32      hierarchy_offset;
  gint         width;
  gint         height;
  gboolean     is_fs_drawable;
  gchar       *name;
  GimpRGB      color = { 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE };

  /* check and see if this is the drawable the floating selection
   *  is attached to. if it is then we'll do the attachment in our caller.
   */
  is_fs_drawable = (info->cp == info->floating_sel_offset);

  /* read in the layer width, height and name */
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);
  if (width <= 0 || height <= 0)
    return NULL;

  info->cp += xcf_read_string (info->fp, &name, 1);

  /* create a new channel */
  channel = gimp_channel_new (image, width, height, name, &color);
  g_free (name);
  if (!channel)
    return NULL;

  /* read in the channel properties */
  if (!xcf_load_channel_props (info, image, &channel))
    goto error;

  xcf_progress_update (info);

  /* read the hierarchy and layer mask offsets */
  info->cp += xcf_read_int32 (info->fp, &hierarchy_offset, 1);

  /* read in the hierarchy */
  if (!xcf_seek_pos (info, hierarchy_offset, NULL))
    goto error;

  if (!xcf_load_hierarchy (info,
                           gimp_drawable_get_tiles (GIMP_DRAWABLE (channel))))
    goto error;

  xcf_progress_update (info);

  if (is_fs_drawable)
    info->floating_sel_drawable = GIMP_DRAWABLE (channel);

  return channel;

 error:
  g_object_unref (channel);
  return NULL;
}

static GimpLayerMask *
xcf_load_layer_mask (XcfInfo   *info,
                     GimpImage *image)
{
  GimpLayerMask *layer_mask;
  GimpChannel   *channel;
  guint32        hierarchy_offset;
  gint           width;
  gint           height;
  gboolean       is_fs_drawable;
  gchar         *name;
  GimpRGB        color = { 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE };

  /* check and see if this is the drawable the floating selection
   *  is attached to. if it is then we'll do the attachment in our caller.
   */
  is_fs_drawable = (info->cp == info->floating_sel_offset);

  /* read in the layer width, height and name */
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);
  if (width <= 0 || height <= 0)
    return NULL;

  info->cp += xcf_read_string (info->fp, &name, 1);

  /* create a new layer mask */
  layer_mask = gimp_layer_mask_new (image, width, height, name, &color);
  g_free (name);
  if (!layer_mask)
    return NULL;

  /* read in the layer_mask properties */
  channel = GIMP_CHANNEL (layer_mask);
  if (!xcf_load_channel_props (info, image, &channel))
    goto error;

  xcf_progress_update (info);

  /* read the hierarchy and layer mask offsets */
  info->cp += xcf_read_int32 (info->fp, &hierarchy_offset, 1);

  /* read in the hierarchy */
  if (! xcf_seek_pos (info, hierarchy_offset, NULL))
    goto error;

  if (!xcf_load_hierarchy (info,
                           gimp_drawable_get_tiles (GIMP_DRAWABLE (layer_mask))))
    goto error;

  xcf_progress_update (info);

  /* attach the floating selection... */
  if (is_fs_drawable)
    info->floating_sel_drawable = GIMP_DRAWABLE (layer_mask);

  return layer_mask;

 error:
  g_object_unref (layer_mask);
  return NULL;
}

static gboolean
xcf_load_hierarchy (XcfInfo     *info,
                    TileManager *tiles)
{
  guint32 offset;
  gint    width;
  gint    height;
  gint    bpp;

  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &bpp, 1);

  /* make sure the values in the file correspond to the values
   *  calculated when the TileManager was created.
   */
  if (width  != tile_manager_width (tiles)  ||
      height != tile_manager_height (tiles) ||
      bpp    != tile_manager_bpp (tiles))
    return FALSE;

  info->cp += xcf_read_int32 (info->fp, &offset, 1); /* top level */

  /* seek to the level offset */
  if (!xcf_seek_pos (info, offset, NULL))
    return FALSE;

  /* read in the level */
  if (!xcf_load_level (info, tiles))
    return FALSE;

  /* discard levels below first.
   */

  return TRUE;
}


static gboolean
xcf_load_level (XcfInfo     *info,
                TileManager *tiles)
{
  guint32 saved_pos;
  guint32 offset, offset2;
  guint ntiles;
  gint  width;
  gint  height;
  gint  i;
  gint  fail;
  Tile *previous;
  Tile *tile;

  info->cp += xcf_read_int32 (info->fp, (guint32 *) &width, 1);
  info->cp += xcf_read_int32 (info->fp, (guint32 *) &height, 1);

  if (width  != tile_manager_width  (tiles) ||
      height != tile_manager_height (tiles))
    return FALSE;

  /* read in the first tile offset.
   *  if it is '0', then this tile level is empty
   *  and we can simply return.
   */
  info->cp += xcf_read_int32 (info->fp, &offset, 1);
  if (offset == 0)
    return TRUE;

  /* Initialize the reference for the in-memory tile-compression
   */
  previous = NULL;

  ntiles = tiles->ntile_rows * tiles->ntile_cols;
  for (i = 0; i < ntiles; i++)
    {
      fail = FALSE;

      if (offset == 0)
        {
          gimp_message_literal (info->gimp, G_OBJECT (info->progress),
				GIMP_MESSAGE_ERROR,
				"not enough tiles found in level");
          return FALSE;
        }

      /* save the current position as it is where the
       *  next tile offset is stored.
       */
      saved_pos = info->cp;

      /* read in the offset of the next tile so we can calculate the amount
         of data needed for this tile*/
      info->cp += xcf_read_int32 (info->fp, &offset2, 1);

      /* if the offset is 0 then we need to read in the maximum possible
         allowing for negative compression */
      if (offset2 == 0)
        offset2 = offset + TILE_WIDTH * TILE_WIDTH * 4 * 1.5;
                                        /* 1.5 is probably more
                                           than we need to allow */

      /* seek to the tile offset */
      if (! xcf_seek_pos (info, offset, NULL))
        return FALSE;

      /* get the tile from the tile manager */
      tile = tile_manager_get (tiles, i, TRUE, TRUE);

      /* read in the tile */
      switch (info->compression)
        {
        case COMPRESS_NONE:
          if (!xcf_load_tile (info, tile))
            fail = TRUE;
          break;
        case COMPRESS_RLE:
          if (!xcf_load_tile_rle (info, tile, offset2 - offset))
            fail = TRUE;
          break;
        case COMPRESS_ZLIB:
          g_warning ("xcf: zlib compression unimplemented");
          fail = TRUE;
          break;
        case COMPRESS_FRACTAL:
          g_warning ("xcf: fractal compression unimplemented");
          fail = TRUE;
          break;
        default:
          g_warning ("xcf: unknown compression");
          fail = TRUE;
          break;
        }

      if (fail)
        {
          tile_release (tile, TRUE);
          return FALSE;
        }

      /* To potentially save memory, we compare the
       *  newly-fetched tile against the last one, and
       *  if they're the same we copy-on-write mirror one against
       *  the other.
       */
      if (previous != NULL)
        {
          tile_lock (previous);
          if (tile_ewidth (tile) == tile_ewidth (previous) &&
              tile_eheight (tile) == tile_eheight (previous) &&
              tile_bpp (tile) == tile_bpp (previous) &&
              memcmp (tile_data_pointer (tile, 0, 0),
                      tile_data_pointer (previous, 0, 0),
                      tile_size (tile)) == 0)
            tile_manager_map (tiles, i, previous);
          tile_release (previous, FALSE);
        }
      tile_release (tile, TRUE);
      previous = tile_manager_get (tiles, i, FALSE, FALSE);

      /* restore the saved position so we'll be ready to
       *  read the next offset.
       */
      if (!xcf_seek_pos (info, saved_pos, NULL))
        return FALSE;

      /* read in the offset of the next tile */
      info->cp += xcf_read_int32 (info->fp, &offset, 1);
    }

  if (offset != 0)
    {
      gimp_message (info->gimp, G_OBJECT (info->progress), GIMP_MESSAGE_ERROR,
                    "encountered garbage after reading level: %d", offset);
      return FALSE;
    }

  return TRUE;
}

static gboolean
xcf_load_tile (XcfInfo *info,
               Tile    *tile)
{
  info->cp += xcf_read_int8 (info->fp, tile_data_pointer (tile, 0, 0),
                             tile_size (tile));

  return TRUE;
}

static gboolean
xcf_load_tile_rle (XcfInfo *info,
                   Tile    *tile,
                   int     data_length)
{
  guchar *data;
  guchar val;
  gint size;
  gint count;
  gint length;
  gint bpp;
  gint i, j;
  gint nmemb_read_successfully;
  guchar *xcfdata, *xcfodata, *xcfdatalimit;

  /* Workaround for bug #357809: avoid crashing on g_malloc() and skip
   * this tile (return TRUE without storing data) as if it did not
   * contain any data.  It is better than returning FALSE, which would
   * skip the whole hierarchy while there may still be some valid
   * tiles in the file.
   */
  if (data_length <= 0)
    return TRUE;

  bpp = tile_bpp (tile);

  xcfdata = xcfodata = g_malloc (data_length);

  /* we have to use fread instead of xcf_read_* because we may be
     reading past the end of the file here */
  nmemb_read_successfully = fread ((gchar *) xcfdata, sizeof (gchar),
                                   data_length, info->fp);
  info->cp += nmemb_read_successfully;

  xcfdatalimit = &xcfodata[nmemb_read_successfully - 1];

  for (i = 0; i < bpp; i++)
    {
      data = (guchar *) tile_data_pointer (tile, 0, 0) + i;
      size = tile_ewidth (tile) * tile_eheight (tile);
      count = 0;

      while (size > 0)
        {
          if (xcfdata > xcfdatalimit)
            {
              goto bogus_rle;
            }

          val = *xcfdata++;

          length = val;
          if (length >= 128)
            {
              length = 255 - (length - 1);
              if (length == 128)
                {
                  if (xcfdata >= xcfdatalimit)
                    {
                      goto bogus_rle;
                    }

                  length = (*xcfdata << 8) + xcfdata[1];
                  xcfdata += 2;
                }

              count += length;
              size -= length;

              if (size < 0)
                {
                  goto bogus_rle;
                }

              if (&xcfdata[length-1] > xcfdatalimit)
                {
                  goto bogus_rle;
                }

              while (length-- > 0)
                {
                  *data = *xcfdata++;
                  data += bpp;
                }
            }
          else
            {
              length += 1;
              if (length == 128)
                {
                  if (xcfdata >= xcfdatalimit)
                    {
                      goto bogus_rle;
                    }

                  length = (*xcfdata << 8) + xcfdata[1];
                  xcfdata += 2;
                }

              count += length;
              size -= length;

              if (size < 0)
                {
                  goto bogus_rle;
                }

              if (xcfdata > xcfdatalimit)
                {
                  goto bogus_rle;
                }

              val = *xcfdata++;

              for (j = 0; j < length; j++)
                {
                  *data = val;
                  data += bpp;
                }
            }
        }
    }
  g_free (xcfodata);
  return TRUE;

 bogus_rle:
  if (xcfodata)
    g_free (xcfodata);
  return FALSE;
}

static GimpParasite *
xcf_load_parasite (XcfInfo *info)
{
  GimpParasite *parasite;
  gchar        *name;
  guint32       flags;
  guint32       size;
  gpointer      data;

  info->cp += xcf_read_string (info->fp, &name, 1);
  info->cp += xcf_read_int32  (info->fp, &flags, 1);
  info->cp += xcf_read_int32  (info->fp, &size, 1);

  if (size > MAX_XCF_PARASITE_DATA_LEN)
    {
      g_warning ("Maximum parasite data length (%ld bytes) exceeded. "
                 "Possibly corrupt XCF file.", MAX_XCF_PARASITE_DATA_LEN);
      g_free (name);
      return NULL;
    }

  data = g_new (gchar, size);
  info->cp += xcf_read_int8 (info->fp, data, size);

  parasite = gimp_parasite_new (name, flags, size, data);

  g_free (name);
  g_free (data);

  return parasite;
}

static gboolean
xcf_load_old_paths (XcfInfo   *info,
                    GimpImage *image)
{
  guint32      num_paths;
  guint32      last_selected_row;
  GimpVectors *active_vectors;

  info->cp += xcf_read_int32 (info->fp, &last_selected_row, 1);
  info->cp += xcf_read_int32 (info->fp, &num_paths, 1);

  while (num_paths-- > 0)
    xcf_load_old_path (info, image);

  active_vectors =
    GIMP_VECTORS (gimp_container_get_child_by_index (gimp_image_get_vectors (image),
                                                     last_selected_row));

  if (active_vectors)
    gimp_image_set_active_vectors (image, active_vectors);

  return TRUE;
}

static gboolean
xcf_load_old_path (XcfInfo   *info,
                   GimpImage *image)
{
  gchar                  *name;
  guint32                 linked;
  guint8                  state;
  guint32                 closed;
  guint32                 num_points;
  guint32                 version; /* changed from num_paths */
  GimpTattoo              tattoo = 0;
  GimpVectors            *vectors;
  GimpVectorsCompatPoint *points;
  gint                    i;

  info->cp += xcf_read_string (info->fp, &name, 1);
  info->cp += xcf_read_int32  (info->fp, &linked, 1);
  info->cp += xcf_read_int8   (info->fp, &state, 1);
  info->cp += xcf_read_int32  (info->fp, &closed, 1);
  info->cp += xcf_read_int32  (info->fp, &num_points, 1);
  info->cp += xcf_read_int32  (info->fp, &version, 1);

  if (version == 2)
    {
      guint32 dummy;

      /* Had extra type field and points are stored as doubles */
      info->cp += xcf_read_int32 (info->fp, (guint32 *) &dummy, 1);
    }
  else if (version == 3)
    {
      guint32 dummy;

      /* Has extra tattoo field */
      info->cp += xcf_read_int32 (info->fp, (guint32 *) &dummy,  1);
      info->cp += xcf_read_int32 (info->fp, (guint32 *) &tattoo, 1);
    }
  else if (version != 1)
    {
      g_warning ("Unknown path type. Possibly corrupt XCF file");

      return FALSE;
    }

  /* skip empty compatibility paths */
  if (num_points == 0)
    {
      g_free (name);
      return FALSE;
    }

  points = g_new0 (GimpVectorsCompatPoint, num_points);

  for (i = 0; i < num_points; i++)
    {
      if (version == 1)
        {
          gint32 x;
          gint32 y;

          info->cp += xcf_read_int32 (info->fp, &points[i].type, 1);
          info->cp += xcf_read_int32 (info->fp, (guint32 *) &x,  1);
          info->cp += xcf_read_int32 (info->fp, (guint32 *) &y,  1);

          points[i].x = x;
          points[i].y = y;
        }
      else
        {
          gfloat x;
          gfloat y;

          info->cp += xcf_read_int32 (info->fp, &points[i].type, 1);
          info->cp += xcf_read_float (info->fp, &x,              1);
          info->cp += xcf_read_float (info->fp, &y,              1);

          points[i].x = x;
          points[i].y = y;
        }
    }

  vectors = gimp_vectors_compat_new (image, name, points, num_points, closed);

  g_free (name);
  g_free (points);

  gimp_item_set_linked (GIMP_ITEM (vectors), linked, FALSE);

  if (tattoo)
    gimp_item_set_tattoo (GIMP_ITEM (vectors), tattoo);

  gimp_image_add_vectors (image, vectors,
                          NULL, /* can't be a tree */
                          gimp_container_get_n_children (gimp_image_get_vectors (image)),
                          FALSE);

  return TRUE;
}

static gboolean
xcf_load_vectors (XcfInfo   *info,
                  GimpImage *image)
{
  guint32      version;
  guint32      active_index;
  guint32      num_paths;
  GimpVectors *active_vectors;

#ifdef GIMP_XCF_PATH_DEBUG
  g_printerr ("xcf_load_vectors\n");
#endif

  info->cp += xcf_read_int32  (info->fp, &version, 1);

  if (version != 1)
    {
      gimp_message (info->gimp, G_OBJECT (info->progress),
                    GIMP_MESSAGE_WARNING,
                    "Unknown vectors version: %d (skipping)", version);
      return FALSE;
    }

  info->cp += xcf_read_int32 (info->fp, &active_index, 1);
  info->cp += xcf_read_int32 (info->fp, &num_paths,    1);

#ifdef GIMP_XCF_PATH_DEBUG
  g_printerr ("%d paths (active: %d)\n", num_paths, active_index);
#endif

  while (num_paths-- > 0)
    if (! xcf_load_vector (info, image))
      return FALSE;

  /* FIXME tree */
  active_vectors =
    GIMP_VECTORS (gimp_container_get_child_by_index (gimp_image_get_vectors (image),
                                                     active_index));

  if (active_vectors)
    gimp_image_set_active_vectors (image, active_vectors);

#ifdef GIMP_XCF_PATH_DEBUG
  g_printerr ("xcf_load_vectors: loaded %d bytes\n", info->cp - base);
#endif
  return TRUE;
}

static gboolean
xcf_load_vector (XcfInfo   *info,
                 GimpImage *image)
{
  gchar       *name;
  GimpTattoo   tattoo = 0;
  guint32      visible;
  guint32      linked;
  guint32      num_parasites;
  guint32      num_strokes;
  GimpVectors *vectors;
  gint         i;

#ifdef GIMP_XCF_PATH_DEBUG
  g_printerr ("xcf_load_vector\n");
#endif

  info->cp += xcf_read_string (info->fp, &name,          1);
  info->cp += xcf_read_int32  (info->fp, &tattoo,        1);
  info->cp += xcf_read_int32  (info->fp, &visible,       1);
  info->cp += xcf_read_int32  (info->fp, &linked,        1);
  info->cp += xcf_read_int32  (info->fp, &num_parasites, 1);
  info->cp += xcf_read_int32  (info->fp, &num_strokes,   1);

#ifdef GIMP_XCF_PATH_DEBUG
  g_printerr ("name: %s, tattoo: %d, visible: %d, linked: %d, "
              "num_parasites %d, num_strokes %d\n",
              name, tattoo, visible, linked, num_parasites, num_strokes);
#endif

  vectors = gimp_vectors_new (image, name);
  g_free (name);

  gimp_item_set_visible (GIMP_ITEM (vectors), visible, FALSE);
  gimp_item_set_linked (GIMP_ITEM (vectors), linked, FALSE);

  if (tattoo)
    gimp_item_set_tattoo (GIMP_ITEM (vectors), tattoo);

  for (i = 0; i < num_parasites; i++)
    {
      GimpParasite *parasite = xcf_load_parasite (info);

      if (! parasite)
        return FALSE;

      gimp_item_parasite_attach (GIMP_ITEM (vectors), parasite, FALSE);
      gimp_parasite_free (parasite);
    }

  for (i = 0; i < num_strokes; i++)
    {
      guint32      stroke_type_id;
      guint32      closed;
      guint32      num_axes;
      guint32      num_control_points;
      guint32      type;
      gfloat       coords[8] = GIMP_COORDS_DEFAULT_VALUES;
      GimpStroke  *stroke;
      gint         j;

      GValueArray *control_points;
      GValue       value = { 0, };
      GimpAnchor   anchor = { { 0, } };
      GType        stroke_type;

      g_value_init (&value, GIMP_TYPE_ANCHOR);

      info->cp += xcf_read_int32 (info->fp, &stroke_type_id,     1);
      info->cp += xcf_read_int32 (info->fp, &closed,             1);
      info->cp += xcf_read_int32 (info->fp, &num_axes,           1);
      info->cp += xcf_read_int32 (info->fp, &num_control_points, 1);

#ifdef GIMP_XCF_PATH_DEBUG
      g_printerr ("stroke_type: %d, closed: %d, num_axes %d, len %d\n",
                  stroke_type_id, closed, num_axes, num_control_points);
#endif

      switch (stroke_type_id)
        {
        case XCF_STROKETYPE_BEZIER_STROKE:
          stroke_type = GIMP_TYPE_BEZIER_STROKE;
          break;

        default:
          g_printerr ("skipping unknown stroke type\n");
          xcf_seek_pos (info,
                        info->cp + 4 * num_axes * num_control_points,
                        NULL);
          continue;
        }

      if (num_axes < 2 || num_axes > 6)
        {
          g_printerr ("bad number of axes in stroke description\n");
          return FALSE;
        }

      control_points = g_value_array_new (num_control_points);

      anchor.selected = FALSE;

      for (j = 0; j < num_control_points; j++)
        {
          info->cp += xcf_read_int32 (info->fp, &type, 1);
          info->cp += xcf_read_float (info->fp, coords, num_axes);

          anchor.type              = type;
          anchor.position.x        = coords[0];
          anchor.position.y        = coords[1];
          anchor.position.pressure = coords[2];
          anchor.position.xtilt    = coords[3];
          anchor.position.ytilt    = coords[4];
          anchor.position.wheel    = coords[5];

          g_value_set_boxed (&value, &anchor);
          g_value_array_append (control_points, &value);

#ifdef GIMP_XCF_PATH_DEBUG
          g_printerr ("Anchor: %d, (%f, %f, %f, %f, %f, %f)\n", type,
                      coords[0], coords[1], coords[2], coords[3],
                      coords[4], coords[5]);
#endif
        }

      g_value_unset (&value);

      stroke = g_object_new (stroke_type,
                             "closed",         closed,
                             "control-points", control_points,
                             NULL);

      gimp_vectors_stroke_add (vectors, stroke);

      g_object_unref (stroke);
      g_value_array_free (control_points);
    }

  gimp_image_add_vectors (image, vectors,
                          NULL, /* FIXME tree */
                          gimp_container_get_n_children (gimp_image_get_vectors (image)),
                          FALSE);

  return TRUE;
}

static gboolean
xcf_skip_unknown_prop (XcfInfo *info,
                       gsize   size)
{
  guint8 buf[16];
  guint  amount;

  while (size > 0)
    {
      if (feof (info->fp))
        return FALSE;

      amount = MIN (16, size);
      info->cp += xcf_read_int8 (info->fp, buf, amount);
      size -= MIN (16, amount);
    }

  return TRUE;
}

static gboolean
xcf_find_layer_offset_table (XcfInfo *info,
                             glong    offset)
{
  guint8 c = 0;
  guint8 buf[4] = { 0, };
  guint layer_offset;
  gint  i;

  xcf_seek_pos (info, offset, NULL);

  /* read all NULL-bytes; return if no byte was read */
  while (c == 0)
    {
      if (xcf_read_int8 (info->fp, &c, 1) == 0)
        return FALSE;
      offset++;
    }

  /* read 4 bytes into buf; ; return if no byte was read */
  buf[0] = c;
  for (i = 1; i < 4; ++i)
    {
      if (xcf_read_int8 (info->fp, &c, 1) == 0)
        return FALSE;
      buf[i] = c;
    }

  layer_offset = 0;

  /* move buf into layer_offset; set file position there */
  for (i = 0; i < 4; ++i)
    {
      layer_offset = (layer_offset << 8) | buf[i];

      if (layer_offset >= offset - 4 + i + 12)
        {
          info->cp = 0;
          xcf_seek_pos (info, offset - 4 + i, NULL);
          return TRUE;
        }
    }

  return FALSE;
}
