+#ifdef HAVE_MAGIC_H
+ magic_t myt = magic_open ( MAGIC_CONTINUE|MAGIC_ERROR|MAGIC_MIME );
+ gboolean zip = FALSE;
+ gboolean bzip2 = FALSE;
+ if ( myt ) {
+#ifdef WINDOWS
+ // We have to 'package' the magic database ourselves :(
+ // --> %PROGRAM FILES%\Viking\magic.mgc
+ magic_load ( myt, "magic.mgc" );
+#else
+ // Use system default
+ magic_load ( myt, NULL );
+#endif
+ const char* magic = magic_file (myt, name);
+ g_debug ("%s: magic output: %s", __FUNCTION__, magic );
+
+ if ( g_strcmp0 (magic, "application/zip; charset=binary") == 0 )
+ zip = TRUE;
+
+ if ( g_strcmp0 (magic, "application/x-bzip2; charset=binary") == 0 )
+ bzip2 = TRUE;
+
+ magic_close ( myt );
+ }
+
+ if ( !(zip || bzip2) )
+ return;
+
+ if ( zip ) {
+ uncompress_zip ( name );
+ }
+ else if ( bzip2 ) {
+ gchar* bz2_name = uncompress_bzip2 ( name );
+ g_remove ( name );
+ g_rename ( bz2_name, name );
+ }
+
+ return;
+#endif
+}
+
+static DownloadResult_t download( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *options, gboolean ftp, void *handle)
+{
+ FILE *f;
+ int ret;
+ gchar *tmpfilename;
+ gboolean failure = FALSE;
+ DownloadFileOptions file_options = {0, NULL, NULL};
+
+ /* Check file */
+ if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
+ {
+ if (options == NULL || (!options->check_file_server_time &&
+ !options->use_etag)) {
+ /* Nothing to do as file already exists and we don't want to check server */
+ return DOWNLOAD_NOT_REQUIRED;
+ }
+
+ time_t tile_age = a_preferences_get(VIKING_PREFERENCES_NAMESPACE "download_tile_age")->u;
+ /* Get the modified time of this file */
+ struct stat buf;
+ g_stat ( fn, &buf );
+ time_t file_time = buf.st_mtime;
+ if ( (time(NULL) - file_time) < tile_age ) {
+ /* File cache is too recent, so return */
+ return DOWNLOAD_NOT_REQUIRED;
+ }
+
+ if (options->check_file_server_time) {
+ file_options.time_condition = file_time;
+ }
+ if (options->use_etag) {
+ gchar *etag_filename = g_strdup_printf("%s.etag", fn);
+ gsize etag_length = 0;
+ g_file_get_contents (etag_filename, &(file_options.etag), &etag_length, NULL);
+ g_free (etag_filename);
+ etag_filename = NULL;
+
+ /* check if etag is short enough */
+ if (etag_length > 100) {
+ g_free(file_options.etag);
+ file_options.etag = NULL;
+ }
+
+ /* TODO: should check that etag is a valid string */
+ }
+
+ } else {
+ gchar *dir = g_path_get_dirname ( fn );
+ g_mkdir_with_parents ( dir , 0777 );
+ g_free ( dir );
+ }
+
+ tmpfilename = g_strdup_printf("%s.tmp", fn);
+ if (!lock_file ( tmpfilename ) )
+ {
+ g_debug("%s: Couldn't take lock on temporary file \"%s\"\n", __FUNCTION__, tmpfilename);
+ g_free ( tmpfilename );
+ if (options->use_etag)
+ g_free ( file_options.etag );
+ return DOWNLOAD_FILE_WRITE_ERROR;
+ }
+ f = g_fopen ( tmpfilename, "w+b" ); /* truncate file and open it */
+ if ( ! f ) {
+ g_warning("Couldn't open temporary file \"%s\": %s", tmpfilename, g_strerror(errno));
+ g_free ( tmpfilename );
+ if (options->use_etag)
+ g_free ( file_options.etag );
+ return DOWNLOAD_FILE_WRITE_ERROR;
+ }
+
+ /* Call the backend function */
+ ret = curl_download_get_url ( hostname, uri, f, options, ftp, &file_options, handle );
+
+ DownloadResult_t result = DOWNLOAD_SUCCESS;
+
+ if (ret != CURL_DOWNLOAD_NO_ERROR && ret != CURL_DOWNLOAD_NO_NEWER_FILE) {
+ g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret);
+ failure = TRUE;
+ result = DOWNLOAD_HTTP_ERROR;
+ }
+
+ if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) {
+ g_debug("%s: file content checking failed", __FUNCTION__);
+ failure = TRUE;
+ result = DOWNLOAD_CONTENT_ERROR;
+ }
+
+ fclose ( f );
+ f = NULL;
+
+ if (failure)
+ {
+ g_warning(_("Download error: %s"), fn);
+ g_remove ( tmpfilename );
+ unlock_file ( tmpfilename );
+ g_free ( tmpfilename );
+ if (options->use_etag) {
+ g_free ( file_options.etag );
+ g_free ( file_options.new_etag );
+ }
+ return result;
+ }
+
+ if ( options->convert_file )
+ options->convert_file ( tmpfilename );
+
+ if (options->use_etag) {
+ if (file_options.new_etag) {
+ /* server returned an etag value */
+ gchar *etag_filename = g_strdup_printf("%s.etag", fn);
+ g_file_set_contents (etag_filename, file_options.new_etag, -1, NULL);
+ g_free (etag_filename);
+ etag_filename = NULL;
+ }
+ }
+
+ if (ret == CURL_DOWNLOAD_NO_NEWER_FILE) {
+ g_remove ( tmpfilename );
+#if GLIB_CHECK_VERSION(2,18,0)
+ g_utime ( fn, NULL ); /* update mtime of local copy */
+#else
+ utimes ( fn, NULL ); /* update mtime of local copy */
+#endif
+ } else {
+ /* move completely-downloaded file to permanent location */
+ if ( g_rename ( tmpfilename, fn ) )
+ g_warning ("%s: file rename failed [%s] to [%s]", __FUNCTION__, tmpfilename, fn );
+ }
+ unlock_file ( tmpfilename );
+ g_free ( tmpfilename );
+
+ if (options->use_etag) {
+ g_free ( file_options.etag );
+ g_free ( file_options.new_etag );
+ }
+ return DOWNLOAD_SUCCESS;
+}
+
+/**
+ * uri: like "/uri.html?whatever"
+ * only reason for the "wrapper" is so we can do redirects.
+ */
+DownloadResult_t a_http_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *opt, void *handle )
+{
+ return download ( hostname, uri, fn, opt, FALSE, handle );
+}
+
+DownloadResult_t a_ftp_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *opt, void *handle )
+{
+ return download ( hostname, uri, fn, opt, TRUE, handle );
+}
+
+void * a_download_handle_init ()
+{
+ return curl_download_handle_init ();
+}
+
+void a_download_handle_cleanup ( void *handle )
+{
+ curl_download_handle_cleanup ( handle );
+}
+
+/**
+ * a_download_url_to_tmp_file:
+ * @uri: The URI (Uniform Resource Identifier)
+ * @options: Download options (maybe NULL)
+ *
+ * returns name of the temporary file created - NULL if unsuccessful
+ * this string needs to be freed once used
+ * the file needs to be removed once used
+ */
+gchar *a_download_uri_to_tmp_file ( const gchar *uri, DownloadMapOptions *options )
+{
+ FILE *tmp_file;
+ int tmp_fd;
+ gchar *tmpname;
+
+ if ( (tmp_fd = g_file_open_tmp ("viking-download.XXXXXX", &tmpname, NULL)) == -1 ) {
+ g_critical (_("couldn't open temp file"));
+ return NULL;
+ }
+
+ tmp_file = fdopen(tmp_fd, "r+");
+
+ if ( curl_download_uri ( uri, tmp_file, options, NULL, NULL ) ) {
+ // error
+ fclose ( tmp_file );
+ g_remove ( tmpname );
+ g_free ( tmpname );
+ return NULL;
+ }
+ fclose ( tmp_file );
+
+ return tmpname;