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diff --git a/content/handlers/javascript/fetcher.c b/content/handlers/javascript/fetcher.c
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+/*
+ * Copyright 2012 Vincent Sanders <vince@kyllikki.org>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf 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; version 2 of the License.
+ *
+ * NetSurf 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/>.
+ */
+
+/** \file
+ * implementation for javascript scheme fetcher
+ *
+ * This fetcher implements http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#javascript-protocol
+ */
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <libwapcaplet/libwapcaplet.h>
+
+#include "utils/nsurl.h"
+#include "utils/corestrings.h"
+#include "utils/ring.h"
+#include "content/fetch.h"
+#include "content/fetchers.h"
+
+#include "javascript/fetcher.h"
+
+/** Context for an resource fetch */
+struct fetch_javascript_context {
+ struct fetch_javascript_context *r_next, *r_prev;
+
+ struct fetch *fetchh; /**< Handle for this fetch */
+
+ bool aborted; /**< Flag indicating fetch has been aborted */
+ bool locked; /**< Flag indicating entry is already entered */
+
+ nsurl *url; /**< The URL being fetched */
+};
+
+static struct fetch_javascript_context *ring = NULL;
+
+
+/** issue fetch callbacks with locking */
+static inline bool fetch_javascript_send_callback(const fetch_msg *msg,
+ struct fetch_javascript_context *ctx)
+{
+ ctx->locked = true;
+ fetch_send_callback(msg, ctx->fetchh);
+ ctx->locked = false;
+
+ return ctx->aborted;
+}
+
+
+/**
+ * called from poll to progress fetch.
+ *
+ * \todo This is currently completely unimplemented and just returns 204
+ */
+static bool fetch_javascript_handler(struct fetch_javascript_context *ctx)
+{
+ fetch_msg msg;
+ int code = 204;
+
+ /* content is going to return error code */
+ fetch_set_http_code(ctx->fetchh, code);
+
+ msg.type = FETCH_FINISHED;
+ fetch_javascript_send_callback(&msg, ctx);
+
+ return true;
+}
+
+
+
+/** callback to initialise the resource fetcher. */
+static bool fetch_javascript_initialise(lwc_string *scheme)
+{
+ return true;
+}
+
+/** callback to finalise the resource fetcher. */
+static void fetch_javascript_finalise(lwc_string *scheme)
+{
+}
+
+static bool fetch_javascript_can_fetch(const nsurl *url)
+{
+ return true;
+}
+
+/** callback to set up a resource fetch context. */
+static void *
+fetch_javascript_setup(struct fetch *fetchh,
+ nsurl *url,
+ bool only_2xx,
+ bool downgrade_tls,
+ const char *post_urlenc,
+ const struct fetch_multipart_data *post_multipart,
+ const char **headers)
+{
+ struct fetch_javascript_context *ctx;
+
+ ctx = calloc(1, sizeof(*ctx));
+ if (ctx == NULL)
+ return NULL;
+
+ ctx->url = nsurl_ref(url);
+
+ ctx->fetchh = fetchh;
+
+ RING_INSERT(ring, ctx);
+
+ return ctx;
+}
+
+/** callback to free a resource fetch */
+static void fetch_javascript_free(void *ctx)
+{
+ struct fetch_javascript_context *c = ctx;
+ if (c->url != NULL) {
+ nsurl_unref(c->url);
+ }
+ RING_REMOVE(ring, c);
+ free(ctx);
+}
+
+/** callback to start a resource fetch */
+static bool fetch_javascript_start(void *ctx)
+{
+ return true;
+}
+
+/** callback to abort a resource fetch */
+static void fetch_javascript_abort(void *ctx)
+{
+ struct fetch_javascript_context *c = ctx;
+
+ /* To avoid the poll loop having to deal with the fetch context
+ * disappearing from under it, we simply flag the abort here.
+ * The poll loop itself will perform the appropriate cleanup.
+ */
+ c->aborted = true;
+}
+
+
+/** callback to poll for additional resource fetch contents */
+static void fetch_javascript_poll(lwc_string *scheme)
+{
+ struct fetch_javascript_context *c, *next;
+
+ if (ring == NULL) return;
+
+ /* Iterate over ring, processing each pending fetch */
+ c = ring;
+ do {
+ /* Ignore fetches that have been flagged as locked.
+ * This allows safe re-entrant calls to this function.
+ * Re-entrancy can occur if, as a result of a callback,
+ * the interested party causes fetch_poll() to be called
+ * again.
+ */
+ if (c->locked == true) {
+ next = c->r_next;
+ continue;
+ }
+
+ /* Only process non-aborted fetches */
+ if (c->aborted == false) {
+ /* resource fetches can be processed in one go */
+ fetch_javascript_handler(c);
+ }
+
+ /* Compute next fetch item at the last possible moment
+ * as processing this item may have added to the ring
+ */
+ next = c->r_next;
+
+ fetch_remove_from_queues(c->fetchh);
+ fetch_free(c->fetchh);
+
+ /* Advance to next ring entry, exiting if we've reached
+ * the start of the ring or the ring has become empty
+ */
+ } while ( (c = next) != ring && ring != NULL);
+}
+
+/**
+ * Register javascript scheme fetcher with fetcher factory.
+ *
+ * \return NSERROR_OK on success or appropriate error code on faliure.
+*/
+nserror fetch_javascript_register(void)
+{
+ lwc_string *scheme = lwc_string_ref(corestring_lwc_javascript);
+ const struct fetcher_operation_table fetcher_ops = {
+ .initialise = fetch_javascript_initialise,
+ .acceptable = fetch_javascript_can_fetch,
+ .setup = fetch_javascript_setup,
+ .start = fetch_javascript_start,
+ .abort = fetch_javascript_abort,
+ .free = fetch_javascript_free,
+ .poll = fetch_javascript_poll,
+ .finalise = fetch_javascript_finalise
+ };
+
+ return fetcher_add(scheme, &fetcher_ops);
+}