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/*

 * QEMU VNC display driver: Websockets support

 *

 * Copyright (C) 2010 Joel Martin

 * Copyright (C) 2012 Tim Hardeck

 *

 * This is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This software 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this software; if not, see <http://www.gnu.org/licenses/>.

 */

#ifndef __QEMU_UI_VNC_WS_H

#define __QEMU_UI_VNC_WS_H

#include <gnutls/gnutls.h>

#define B64LEN(__x) (((__x + 2) / 3) * 12 / 3)

#define SHA1_DIGEST_LEN 20

#define WS_ACCEPT_LEN (B64LEN(SHA1_DIGEST_LEN) + 1)

#define WS_CLIENT_KEY_LEN 24

#define WS_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"

#define WS_GUID_LEN strlen(WS_GUID)

#define WS_HANDSHAKE "HTTP/1.1 101 Switching Protocols\r\n\

Upgrade: websocket\r\n\

Connection: Upgrade\r\n\

Sec-WebSocket-Accept: %s\r\n\

Sec-WebSocket-Protocol: binary\r\n\

\r\n"

#define WS_HANDSHAKE_DELIM "\r\n"

#define WS_HANDSHAKE_END "\r\n\r\n"

#define WS_SUPPORTED_VERSION "13"

#define WS_HEAD_MIN_LEN sizeof(uint16_t)

#define WS_HEAD_MAX_LEN (WS_HEAD_MIN_LEN + sizeof(uint64_t) + sizeof(uint32_t))

typedef union WsMask {

    char c[4];

    uint32_t u;

} WsMask;

typedef struct QEMU_PACKED WsHeader {

    unsigned char b0;

    unsigned char b1;

    union {

        struct QEMU_PACKED {

            uint16_t l16;

            WsMask m16;

        } s16;

        struct QEMU_PACKED {

            uint64_t l64;

            WsMask m64;

        } s64;

        WsMask m;

    } u;

} WsHeader;

enum {

    WS_OPCODE_CONTINUATION = 0x0,

    WS_OPCODE_TEXT_FRAME = 0x1,

    WS_OPCODE_BINARY_FRAME = 0x2,

    WS_OPCODE_CLOSE = 0x8,

    WS_OPCODE_PING = 0x9,

    WS_OPCODE_PONG = 0xA

};

void vncws_handshake_read(void *opaque);

long vnc_client_write_ws(VncState *vs);

long vnc_client_read_ws(VncState *vs);

void vncws_process_handshake(VncState *vs, uint8_t *line, size_t size);

void vncws_encode_frame(Buffer *output, const void *payload,

            const size_t payload_size);

int vncws_decode_frame(Buffer *input, uint8_t **payload,

                               size_t *payload_size, size_t *frame_size);

#endif /* __QEMU_UI_VNC_WS_H */