File content as of revision 8:ccedee13be8d:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef WEBSOCKET_H
#define WEBSOCKET_H

#include "mbed.h"

#include "TCPSocketConnection.h"

/** Websocket client Class.
 *
 * Example (ethernet network):
 * @code
 * #include "mbed.h"
 * #include "EthernetInterface.h"
 * #include "Websocket.h"
 *
 * int main() {
 *    EthernetInterface eth;
 *    eth.init(); //Use DHCP
 *    eth.connect();
 *    printf("IP Address is %s\n\r", eth.getIPAddress());
 *   
 *    Websocket ws("ws://sockets.mbed.org:443/ws/demo/rw");
 *    ws.connect();
 *   
 *    while (1) {
 *        int res = ws.send("WebSocket Hello World!");
 *
 *        if (ws.read(recv)) {
 *            printf("rcv: %s\r\n", recv);
 *        }
 *
 *        wait(0.1);
 *    }
 * }
 * @endcode
 */
 
class Websocket
{
    public:
        /**
        * Constructor
        *
        * @param url The Websocket url in the form "ws://ip_domain[:port]/path" (by default: port = 80)
        */
        Websocket(char * url);

        /**
        * Connect to the websocket url
        *
        *@return true if the connection is established, false otherwise
        */
        bool connect();

        /**
        * Send a string according to the websocket format (see rfc 6455)
        *
        * @param str string to be sent
        *
        * @returns the number of bytes sent
        */
        int send(char * str);

        /**
        * Read a websocket message
        *
        * @param message pointer to the string to be read (null if drop frame)
        *
        * @return true if a websocket frame has been read
        */
        bool read(char * message);

        /**
        * To see if there is a websocket connection active
        *
        * @return true if there is a connection active
        */
        bool is_connected();

        /**
        * Close the websocket connection
        *
        * @return true if the connection has been closed, false otherwise
        */
        bool close();

        /*
        * Accessor: get path from the websocket url
        *
        * @return path
        */
        char* getPath();

    private:

        void fillFields(char * url);
        int parseURL(const char* url, char* scheme, size_t maxSchemeLen, char* host, size_t maxHostLen, uint16_t* port, char* path, size_t maxPathLen); //Parse URL
        int sendOpcode(uint8_t opcode, char * msg);
        int sendLength(uint32_t len, char * msg);
        int sendMask(char * msg);
        int readChar(char * pC, bool block = true);
        
        char scheme[8];
        uint16_t port;
        char host[32];
        char path[64];
        
        TCPSocketConnection socket;

        int read(char * buf, int len, int min_len = -1);
        int write(char * buf, int len);
};

#endif