gimp/app/xcf/xcf-read.c

/* The GIMP -- an 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <stdio.h>

#include <glib.h>

#include "xcf-read.h"

#include "gimp-intl.h"


guint
xcf_read_int32 (FILE    *fp,
		guint32 *data,
		gint     count)
{
  guint total;

  total = count;
  if (count > 0)
    {
      xcf_read_int8 (fp, (guint8 *) data, count * 4);

      while (count--)
        {
          *data = g_ntohl (*data);
          data++;
        }
    }

  return total * 4;
}

guint
xcf_read_float (FILE   *fp,
		gfloat *data,
		gint    count)
{
  return xcf_read_int32 (fp, (guint32 *) ((void *) data), count);
}

guint
xcf_read_int8 (FILE   *fp,
	       guint8 *data,
	       gint    count)
{
  guint total;
  gint  bytes;

  total = count;
  while (count > 0)
    {
      bytes = fread ((char *) data, sizeof (char), count, fp);
      if (bytes <= 0) /* something bad happened */
        break;
      count -= bytes;
      data += bytes;
    }

  return total;
}

guint
xcf_read_string (FILE   *fp,
		 gchar **data,
		 gint    count)
{
  guint32 tmp;
  guint   total;
  gint    i;

  total = 0;
  for (i = 0; i < count; i++)
    {
      total += xcf_read_int32 (fp, &tmp, 1);
      if (tmp > 0)
        {
          gchar *str;

          str = g_new (gchar, tmp);
          total += xcf_read_int8 (fp, (guint8*) str, tmp);

          if (str[tmp - 1] != '\0')
            str[tmp - 1] = '\0';

          if (! g_utf8_validate (str, -1, NULL))
            {
              gchar *utf8_str;

              utf8_str = g_locale_to_utf8 (str, -1, NULL, NULL, NULL);

              g_free (str);

              if (utf8_str)
                str = utf8_str;
              else
                str = g_strdup (_("(invalid UTF-8 string)"));
            }

          data[i] = str;
        }
      else
        {
          data[i] = NULL;
        }
    }

  return total;
}