/*
 * Copyright (c) 2013-2014 Joris Vink <joris@coders.se>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef __H_SPDY_H
#define __H_SPDY_H

#include <sys/types.h>
#include <sys/queue.h>

struct spdy_ctrl_frame {
	u_int16_t	version;
	u_int16_t	type;
	u_int8_t	flags;
	u_int32_t	length;
};

struct spdy_data_frame {
	u_int32_t	stream_id;
	u_int8_t	flags;
	u_int32_t	length;
};

struct spdy_syn_stream {
	u_int32_t	stream_id;
	u_int32_t	assoc_stream_id;
	u_int8_t	slot;
	u_int8_t	reserved;
	u_int8_t	prio;
};

struct spdy_header_block {
	u_int8_t	*header_block;
	u_int32_t	header_block_len;
	u_int32_t	header_offset;
	u_int32_t	header_pairs;
};

struct spdy_stream {
	u_int32_t	stream_id;
	u_int8_t	flags;
	u_int8_t	prio;
	u_int64_t	post_size;
	u_int64_t	send_size;
	u_int32_t	frame_size;
	u_int32_t	recv_wsize;
	u_int32_t	send_wsize;

	void				*httpreq;
	struct spdy_header_block	*hblock;

	TAILQ_ENTRY(spdy_stream)	list;
};

extern const unsigned char SPDY_dictionary_txt[];

#define KORE_SSL_PROTO_STRING		"\x08spdy/3.1\x08http/1.1"
#define SPDY_CONTROL_FRAME(x)		((x & (1 << 31)))

#define SPDY_FRAME_SIZE			8
#define SPDY_SYNFRAME_SIZE		10
#define SPDY_ZLIB_DICT_SIZE		1423
#define SPDY_ZLIB_CHUNK			16348
#define SPDY_INIT_WSIZE			65536

/* control frames */
#define SPDY_CTRL_FRAME_SYN_STREAM	1
#define SPDY_CTRL_FRAME_SYN_REPLY	2
#define SPDY_CTRL_FRAME_RST_STREAM	3
#define SPDY_CTRL_FRAME_SETTINGS	4
#define SPDY_CTRL_FRAME_PING		6
#define SPDY_CTRL_FRAME_GOAWAY		7
#define SPDY_CTRL_FRAME_WINDOW		9
#define SPDY_DATA_FRAME			99

/* session error codes */
#define SPDY_SESSION_ERROR_OK		0
#define SPDY_SESSION_ERROR_PROTOCOL	1
#define SPDY_SESSION_ERROR_INTERNAL	2

/* flags */
#define FLAG_FIN			0x01
#define FLAG_UNIDIRECTIONAL		0x02

/* settings */
#define SETTINGS_UPLOAD_BANDWIDTH		1
#define SETTINGS_DOWNLOAD_BANDWIDTH		2
#define SETTINGS_ROUND_TRIP_TIME		3
#define SETTINGS_MAX_CONCURRENT_STREAMS		4
#define SETTINGS_CURRENT_CWND			5
#define SETTINGS_DOWNLOAD_RETRANS_RATE		6
#define SETTINGS_INITIAL_WINDOW_SIZE		7
#define SETTINGS_CLIENT_CERTIFICATE_VECTOR_SIZE	8

#define SPDY_HBLOCK_NORMAL		0
#define SPDY_HBLOCK_DELAYED_ALLOC	1

#define SPDY_FLOW_WINDOW_MAX		2147483647

/* internal flags (make sure they don't clash with SPDY stream flags) */
#define SPDY_KORE_FIN			0x10
#define SPDY_DATAFRAME_PRELUDE		0x20

#define SPDY_KEEP_NETBUFS		0
#define SPDY_REMOVE_NETBUFS		1

#endif /* !__H_SPDY_H */