153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*
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* Copyright 2014 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file content/fetchers.h
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*
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* Interface for fetchers factory.
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*/
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#ifndef _NETSURF_DESKTOP_FETCHERS_H_
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#define _NETSURF_DESKTOP_FETCHERS_H_
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#include "utils/config.h"
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#include <libwapcaplet/libwapcaplet.h>
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struct nsurl;
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struct fetch_multipart_data;
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struct fetch;
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/**
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* Fetcher operations API
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*
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* These are the operations a fetcher must implement.
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*
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* Each fetcher is called once for initialisaion and finalisation.
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* The poll entry point will be called to allow all active fetches to progress.
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* The flow of a fetch operation is:
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* URL is checked for aceptability.
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* setup with all applicable data.
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* start is called before the first poll
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* after completion or abort it is freed
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*
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*/
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struct fetcher_operation_table {
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/**
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* The initialiser for the fetcher.
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*
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* Called once to initialise the fetcher.
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*/
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bool (*initialise)(lwc_string *scheme);
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/**
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* Can this fetcher accept a url.
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*
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* \param url the URL to check
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* \return true if the fetcher can handle the url else false.
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*/
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bool (*acceptable)(const struct nsurl *url);
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/**
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* Setup a fetch
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*/
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void *(*setup)(struct fetch *parent_fetch, struct nsurl *url,
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bool only_2xx, bool downgrade_tls, const char *post_urlenc,
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const struct fetch_multipart_data *post_multipart,
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const char **headers);
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/**
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* start a fetch.
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*/
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bool (*start)(void *fetch);
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/**
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* abort a fetch.
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*/
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void (*abort)(void *fetch);
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/**
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* free a fetch allocated through the setup method.
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*/
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void (*free)(void *fetch);
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/**
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* poll a fetcher to let it make progress.
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*/
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void (*poll)(lwc_string *scheme);
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/**
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* Finalise the fetcher.
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*/
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void (*finalise)(lwc_string *scheme);
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};
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/**
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* Register a fetcher for a scheme
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*
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* \param scheme The scheme fetcher is for (caller relinquishes ownership)
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* \param ops The operations for the fetcher.
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* \return NSERROR_OK or appropriate error code.
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*/
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nserror fetcher_add(lwc_string *scheme, const struct fetcher_operation_table *ops);
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/**
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* Initialise all registered fetchers.
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*
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* \return NSERROR_OK or error code
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*/
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nserror fetcher_init(void);
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/**
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* Clean up for quit.
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*
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* Must be called before exiting.
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*/
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void fetcher_quit(void);
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/**
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* Get the set of file descriptors the fetchers are currently using.
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*
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* This obtains the file descriptors the fetch system is using to
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* obtain data. It will cause the fetchers to make progress, if
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* possible, potentially completing fetches before requiring activity
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* on file descriptors.
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*
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* If a set of descriptors is returned (maxfd is not -1) The caller is
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* expected to wait on them (with select etc.) and continue to obtain
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* the fdset with this call. This will switch the fetchers from polled
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* mode to waiting for network activity which is much more efficient.
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*
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* \note If the caller does not subsequently obtain the fdset again
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* the fetchers will fall back to the less efficient polled
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* operation. The fallback to polled operation will only occour after
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* a timeout which introduces additional delay.
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*
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* \param[out] read_fd_set The fd set for read.
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* \param[out] write_fd_set The fd set for write.
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* \param[out] except_fd_set The fd set for exceptions.
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* \param[out] maxfd The highest fd number in the set or -1 if no fd available.
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* \return NSERROR_OK on success or appropriate error code.
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*/
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nserror fetcher_fdset(fd_set *read_fd_set, fd_set *write_fd_set, fd_set *except_fd_set, int *maxfd);
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#endif
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