WebSocket实现原理

extend_payload_len_bits = 2;

// consts of ((fin + rsv1/2/3 + opcode) + payload-len bits + extend-payload-len bites + mask bit len + payload len)

frame_size = 1 + 1 + extend_payload_len_bits + MASK_BIT_LEN + payload_size;

payload_len_bits = 126;

payload_bit_offset += extend_payload_len_bits;

} else if (payload_size > 0xffff && payload_size 0xffffffffffffffffLL) {

extend_payload_len_bits = 8;

// consts of ((fin + rsv1/2/3 + opcode) + payload-len bits + extend-payload-len bites + mask bit len + payload len)

frame_size = 1 + 1 + extend_payload_len_bits + MASK_BIT_LEN + payload_size;

payload_len_bits = 127;

payload_bit_offset += extend_payload_len_bits;

} else {

if (ws->error_cb) {

ws_error_t *err = ws_new_error(WS_SEND_DATA_TOO_LARGE_ERR);

ws->error_cb(ws, err);

free(err);

}

return ;

}

*out_size = frame_size;

char *data = (*out) = (char *)malloc(frame_size);

char *buf_offset = data;

bzero(data, frame_size);

*data = flags & 0xff;

buf_offset = data + 1;

// set mask bit = 1

*(buf_offset) = payload_len_bits | 0x80; //payload length with mask bit on

buf_offset = data + 2;

if (payload_len_bits == 126) {

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