WebSocket实现原理

ret = ws__recv(ws);

if (ret != OK) {

break;

}

return ret;

}

int ws__recv(websocket_t *ws) {

if (ws->state

return ws_do_handshake(ws);

}

int ret = OK, i;

int state = ws->rd_state;

char *rd_buf;

switch(state) {

case WS_READ_IDLE: {

ret = ws__make_up(ws, 2);

if (ret != OK) {

return ret;

}

ws_frame_t * frame;

if (ws->c_frame == NULL) {

ws__append_frame(ws);

}

frame = ws->c_frame;

rd_buf = ws->buf;

frame->fin = (*(rd_buf) & 0x80) == 0x80 ? 1 : 0;

frame->op_code = *(rd_buf) & 0x0fu;

frame->payload_len = *(rd_buf + 1) & 0x7fu;

if (frame->payload_len 126) {

frame->payload_bit_offset = 2;

ws->rd_state = WS_READ_PAYLOAD;

} else if (frame -> payload_len == 126) {

frame->payload_bit_offset = 4;

ws->rd_state = WS_READ_EXTEND_PAYLOAD_2_WORDS;

} else {

frame->payload_bit_offset = 8;

ws->rd_state = WS_READ_EXTEND_PAYLOAD_8_WORDS;

}

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