/**
* Callback for low-level cache events
*
* \param handle Low-level cache handle
* \param event Event object
* \param pw Our context
* \return NSERROR_OK on success, appropriate error otherwise
*/
static nserror download_callback(llcache_handle *handle,
const llcache_event *event, void *pw)
{
download_context *ctx = pw;
nserror error = NSERROR_OK;
switch (event->type) {
case LLCACHE_EVENT_HAD_HEADERS:
error = download_context_process_headers(ctx);
if (error != NSERROR_OK) {
llcache_handle_abort(handle);
download_context_destroy(ctx);
}
break;
case LLCACHE_EVENT_HAD_DATA:
/* If we didn't know up-front that this fetch was for download,
* then we won't receive the HAD_HEADERS event. Catch up now.
*/
if (ctx->window == NULL) {
error = download_context_process_headers(ctx);
if (error != NSERROR_OK) {
llcache_handle_abort(handle);
download_context_destroy(ctx);
}
}
if (error == NSERROR_OK) {
/** \todo Lose ugly cast */
error = gui_download_window_data(ctx->window,
(char *) event->data.data.buf,
event->data.data.len);
if (error != NSERROR_OK)
llcache_handle_abort(handle);
}
break;
case LLCACHE_EVENT_DONE:
assert(ctx->window != NULL);
gui_download_window_done(ctx->window);
break;
case LLCACHE_EVENT_ERROR:
if (ctx->window != NULL)
gui_download_window_error(ctx->window, event->data.msg);
break;
case LLCACHE_EVENT_PROGRESS:
break;
}
return error;
}
/* See hlcache.h for documentation */
nserror hlcache_handle_abort(hlcache_handle *handle)
{
struct hlcache_entry *entry = handle->entry;
struct content *c;
if (entry == NULL) {
/* This handle is not yet associated with a cache entry.
* The implication is that the fetch for the handle has
* not progressed to the point where the entry can be
* created. */
RING_ITERATE_START(struct hlcache_retrieval_ctx,
hlcache->retrieval_ctx_ring,
ictx) {
if (ictx->handle == handle &&
ictx->migrate_target == false) {
/* This is the nascent context for us,
* so abort the fetch */
llcache_handle_abort(ictx->llcache);
llcache_handle_release(ictx->llcache);
/* Remove us from the ring */
RING_REMOVE(hlcache->retrieval_ctx_ring, ictx);
/* Throw us away */
free((char *) ictx->child.charset);
free(ictx);
/* And stop */
RING_ITERATE_STOP(hlcache->retrieval_ctx_ring,
ictx);
}
} RING_ITERATE_END(hlcache->retrieval_ctx_ring, ictx);
return NSERROR_OK;
}
/* See hlcache.h for documentation */
nserror hlcache_handle_release(hlcache_handle *handle)
{
if (handle->entry != NULL) {
content_remove_user(handle->entry->content,
hlcache_content_callback, handle);
} else {
RING_ITERATE_START(struct hlcache_retrieval_ctx,
hlcache->retrieval_ctx_ring,
ictx) {
if (ictx->handle == handle &&
ictx->migrate_target == false) {
/* This is the nascent context for us,
* so abort the fetch */
llcache_handle_abort(ictx->llcache);
llcache_handle_release(ictx->llcache);
/* Remove us from the ring */
RING_REMOVE(hlcache->retrieval_ctx_ring, ictx);
/* Throw us away */
free((char *) ictx->child.charset);
free(ictx);
/* And stop */
RING_ITERATE_STOP(hlcache->retrieval_ctx_ring,
ictx);
}
} RING_ITERATE_END(hlcache->retrieval_ctx_ring, ictx);
}
handle->cb = NULL;
handle->pw = NULL;
free(handle);
return NSERROR_OK;
}
/**
* Handler for low-level cache events
*
* \param llcache Low-level cache handle
* \param event Event details
* \param pw Pointer to our context
* \return NSERROR_OK on success, appropriate error otherwise
*/
nserror content_llcache_callback(llcache_handle *llcache,
const llcache_event *event, void *pw)
{
struct content *c = pw;
union content_msg_data msg_data;
nserror error = NSERROR_OK;
switch (event->type) {
case LLCACHE_EVENT_HAD_HEADERS:
/* Will never happen: handled in hlcache */
break;
case LLCACHE_EVENT_HAD_DATA:
if (c->handler->process_data != NULL) {
if (c->handler->process_data(c,
(const char *) event->data.data.buf,
event->data.data.len) == false) {
llcache_handle_abort(c->llcache);
c->status = CONTENT_STATUS_ERROR;
/** \todo It's not clear what error this is */
error = NSERROR_NOMEM;
}
}
break;
case LLCACHE_EVENT_DONE:
{
size_t source_size;
(void) llcache_handle_get_source_data(llcache, &source_size);
content_set_status(c, messages_get("Processing"));
msg_data.explicit_status_text = NULL;
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
content_convert(c);
}
break;
case LLCACHE_EVENT_ERROR:
/** \todo Error page? */
c->status = CONTENT_STATUS_ERROR;
msg_data.error = event->data.msg;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
break;
case LLCACHE_EVENT_PROGRESS:
content_set_status(c, event->data.msg);
msg_data.explicit_status_text = NULL;
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
break;
case LLCACHE_EVENT_REDIRECT:
msg_data.redirect.from = event->data.redirect.from;
msg_data.redirect.to = event->data.redirect.to;
content_broadcast(c, CONTENT_MSG_REDIRECT, msg_data);
break;
}
return error;
}
/**
* Abort a content object
*
* \param c The content object to abort
* \return NSERROR_OK on success, otherwise appropriate error
*/
nserror content_abort(struct content *c)
{
LOG("Aborting %p", c);
if (c->handler->stop != NULL)
c->handler->stop(c);
/* And for now, abort our llcache object */
return llcache_handle_abort(c->llcache);
}
/**
* Migrate a retrieval context into its final destination content
*
* \param ctx Context to migrate
* \param effective_type The effective MIME type of the content, or NULL
* \return NSERROR_OK on success,
* NSERROR_NEED_DATA on success where data is needed,
* appropriate error otherwise
*/
static nserror hlcache_migrate_ctx(hlcache_retrieval_ctx *ctx,
lwc_string *effective_type)
{
content_type type = CONTENT_NONE;
nserror error = NSERROR_OK;
ctx->migrate_target = true;
if (effective_type != NULL &&
hlcache_type_is_acceptable(effective_type,
ctx->accepted_types, &type)) {
error = hlcache_find_content(ctx, effective_type);
if (error != NSERROR_OK && error != NSERROR_NEED_DATA) {
if (ctx->handle->cb != NULL) {
hlcache_event hlevent;
hlevent.type = CONTENT_MSG_ERROR;
hlevent.data.error = messages_get("MiscError");
ctx->handle->cb(ctx->handle, &hlevent,
ctx->handle->pw);
}
llcache_handle_abort(ctx->llcache);
llcache_handle_release(ctx->llcache);
}
} else if (type == CONTENT_NONE &&
(ctx->flags & HLCACHE_RETRIEVE_MAY_DOWNLOAD)) {
/* Unknown type, and we can download, so convert */
llcache_handle_force_stream(ctx->llcache);
if (ctx->handle->cb != NULL) {
hlcache_event hlevent;
hlevent.type = CONTENT_MSG_DOWNLOAD;
hlevent.data.download = ctx->llcache;
ctx->handle->cb(ctx->handle, &hlevent,
ctx->handle->pw);
}
/* Ensure caller knows we need data */
error = NSERROR_NEED_DATA;
} else {
/* Unacceptable type: report error */
if (ctx->handle->cb != NULL) {
hlcache_event hlevent;
hlevent.type = CONTENT_MSG_ERROR;
hlevent.data.error = messages_get("UnacceptableType");
ctx->handle->cb(ctx->handle, &hlevent,
ctx->handle->pw);
}
llcache_handle_abort(ctx->llcache);
llcache_handle_release(ctx->llcache);
}
ctx->migrate_target = false;
/* No longer require retrieval context */
RING_REMOVE(hlcache->retrieval_ctx_ring, ctx);
free((char *) ctx->child.charset);
free(ctx);
return error;
}
/* See download.h for documentation */
void download_context_abort(download_context *ctx)
{
llcache_handle_abort(ctx->llcache);
}
