/*
 * Copyright (c) 2014 Micro Systems Marc Balmer, CH-5073 Gipf-Oberfrick.
 * Copyright (c) 2014 Putilov Andrey
 *
 * 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.
 */

#ifndef __WEBSOCKET_H__
#define __WEBSOCKET_H__

#include <stdint.h>

static const char connectionField[] = "Connection: ";
static const char upgrade[] = "upgrade";
static const char upgrade2[] = "Upgrade";
static const char upgradeField[] = "Upgrade: ";
static const char websocket[] = "websocket";
static const char hostField[] = "Host: ";
static const char originField[] = "Origin: ";
static const char keyField[] = "Sec-WebSocket-Key: ";
static const char protocolField[] = "Sec-WebSocket-Protocol: ";
static const char versionField[] = "Sec-WebSocket-Version: ";
static const char version[] = "13";
static const char secret[] = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

enum wsFrameType {
	/* errors starting from 0xF0 */
	WS_EMPTY_FRAME = 0xf0,
	WS_ERROR_FRAME = 0xf1,
	WS_INCOMPLETE_FRAME = 0xf2,
	WS_TEXT_FRAME = 0x01,
	WS_BINARY_FRAME = 0x02,
	WS_PING_FRAME = 0x09,
	WS_PONG_FRAME = 0x0a,
	WS_OPENING_FRAME = 0xf3,
	WS_CLOSING_FRAME = 0x08
};

enum wsState {
	WS_STATE_OPENING,
	WS_STATE_NORMAL,
	WS_STATE_CLOSING
};

struct handshake {
	char *host;
	char *origin;
	char *key;
	char *resource;
	enum wsFrameType frameType;
};

extern enum wsFrameType wsParseHandshake(const uint8_t *inputFrame,
    size_t inputLength, struct handshake *hs);

extern void wsGetHandshakeAnswer(const struct handshake *hs, uint8_t *outFrame,
    size_t *outLength);

extern void wsMakeFrame(const uint8_t *data, size_t dataLength,
    uint8_t *outFrame, size_t *outLength, enum wsFrameType frameType);

enum wsFrameType wsParseInputFrame(uint8_t *inputFrame, size_t inputLength,
    uint8_t **dataPtr, size_t *dataLength);

extern void nullHandshake(struct handshake *hs);
extern void freeHandshake(struct handshake *hs);

#endif  /* __WEBSOCKET_H__ */