lws-ws-ext.h

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 *
 * included from libwebsockets.h
 */
 
 
/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_extension_callback_reasons {
        LWS_EXT_CB_CONSTRUCT                            =  4,
        LWS_EXT_CB_CLIENT_CONSTRUCT                     =  5,
        LWS_EXT_CB_DESTROY                              =  8,
        LWS_EXT_CB_PACKET_TX_PRESEND                    = 12,
        LWS_EXT_CB_PAYLOAD_TX                           = 21,
        LWS_EXT_CB_PAYLOAD_RX                           = 22,
        LWS_EXT_CB_OPTION_DEFAULT                       = 23,
        LWS_EXT_CB_OPTION_SET                           = 24,
        LWS_EXT_CB_OPTION_CONFIRM                       = 25,
        LWS_EXT_CB_NAMED_OPTION_SET                     = 26,
 
        /****** add new things just above ---^ ******/
};
 
enum lws_ext_options_types {
        EXTARG_NONE, 
        EXTARG_DEC,  
        EXTARG_OPT_DEC 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};
 
struct lws_ext_options {
        const char *name; 
        enum lws_ext_options_types type; 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};
 
struct lws_ext_option_arg {
        const char *option_name; 
        int option_index; 
        const char *start; 
        int len; 
};
 
typedef int
lws_extension_callback_function(struct lws_context *context,
                              const struct lws_extension *ext, struct lws *wsi,
                              enum lws_extension_callback_reasons reason,
                              void *user, void *in, size_t len);
 
struct lws_extension {
        const char *name; 
        lws_extension_callback_function *callback; 
        const char *client_offer; 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};
 
LWS_VISIBLE LWS_EXTERN int
lws_set_extension_option(struct lws *wsi, const char *ext_name,
                         const char *opt_name, const char *opt_val);
 
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
                      void *ext_user, const struct lws_ext_options *opts,
                      const char *o, int len);
 
LWS_EXTERN int
lws_extension_callback_pm_deflate(struct lws_context *context,
                                  const struct lws_extension *ext,
                                  struct lws *wsi,
                                  enum lws_extension_callback_reasons reason,
                                  void *user, void *in, size_t len);
 
/*
 * The internal exts are part of the public abi
 * If we add more extensions, publish the callback here  ------v
 */