lws-write.h

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#if !defined(LWS_SIZEOFPTR)
#define LWS_SIZEOFPTR ((int)sizeof (void *))
#endif
 
#if defined(__x86_64__)
#define _LWS_PAD_SIZE 16        /* Intel recommended for best performance */
#else
#define _LWS_PAD_SIZE LWS_SIZEOFPTR   /* Size of a pointer on the target arch */
#endif
#define _LWS_PAD(n) (((n) % _LWS_PAD_SIZE) ? \
                ((n) + (_LWS_PAD_SIZE - ((n) % _LWS_PAD_SIZE))) : (n))
/* last 2 is for lws-meta */
#define LWS_PRE _LWS_PAD(4 + 10 + 2)
/* used prior to 1.7 and retained for backward compatibility */
#define LWS_SEND_BUFFER_PRE_PADDING LWS_PRE
#define LWS_SEND_BUFFER_POST_PADDING 0
 
#define LWS_WRITE_RAW LWS_WRITE_HTTP
 
/*
 * 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_write_protocol {
        LWS_WRITE_TEXT                                          = 0,
        LWS_WRITE_BINARY                                        = 1,
        LWS_WRITE_CONTINUATION                                  = 2,
        LWS_WRITE_HTTP                                          = 3,
        /* LWS_WRITE_CLOSE is handled by lws_close_reason() */
        LWS_WRITE_PING                                          = 5,
        LWS_WRITE_PONG                                          = 6,
 
        /* Same as write_http but we know this write ends the transaction */
        LWS_WRITE_HTTP_FINAL                                    = 7,
 
        /* HTTP2 */
 
        LWS_WRITE_HTTP_HEADERS                                  = 8,
        LWS_WRITE_HTTP_HEADERS_CONTINUATION                     = 9,
        /****** add new things just above ---^ ******/
 
        /* flags */
 
        LWS_WRITE_BUFLIST = 0x20,
        LWS_WRITE_NO_FIN = 0x40,
        LWS_WRITE_H2_STREAM_END = 0x80,
        LWS_WRITE_CLIENT_IGNORE_XOR_MASK = 0x80
};
 
/* used with LWS_CALLBACK_CHILD_WRITE_VIA_PARENT */
 
struct lws_write_passthru {
        struct lws *wsi;
        unsigned char *buf;
        size_t len;
        enum lws_write_protocol wp;
};
 
 
LWS_VISIBLE LWS_EXTERN int
lws_write(struct lws *wsi, unsigned char *buf, size_t len,
          enum lws_write_protocol protocol);
 
/* helper for case where buffer may be const */
#define lws_write_http(wsi, buf, len) \
        lws_write(wsi, (unsigned char *)(buf), len, LWS_WRITE_HTTP)
 
static LWS_INLINE int
lws_write_ws_flags(int initial, int is_start, int is_end)
{
        int r;
 
        if (is_start)
                r = initial;
        else
                r = LWS_WRITE_CONTINUATION;
 
        if (!is_end)
                r |= LWS_WRITE_NO_FIN;
 
        return r;
}
 
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_raw_transaction_completed(struct lws *wsi);