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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1988, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)ring.h 8.1 (Berkeley) 6/6/93
	34	* $FreeBSD: src/crypto/telnet/telnet/ring.h,v 1.1.1.1.8.1 2002/04/13 10:59:08 markm Exp $
	35	* $DragonFly: src/crypto/telnet/telnet/ring.h,v 1.2 2003/06/17 04:24:37 dillon Exp $
	36	*/
	37
	38	#if defined(P)
	39	# undef P
	40	#endif
	41
	42	#if defined(__STDC__) \|\| defined(LINT_ARGS)
	43	# define P(x) x
	44	#else
	45	# define P(x) ()
	46	#endif
	47
	48	/*
	49	* This defines a structure for a ring buffer.
	50	*
	51	* The circular buffer has two parts:
	52	*(((
	53	* full: [consume, supply)
	54	* empty: [supply, consume)
	55	*]]]
	56	*
	57	*/
	58	typedef struct {
	59	unsigned char consume, / where data comes out of */
	60	supply, / where data comes in to */
	61	bottom, / lowest address in buffer */
	62	top, / highest address+1 in buffer */
	63	mark; / marker (user defined) */
	64	#ifdef ENCRYPTION
	65	unsigned char clearto; / Data to this point is clear text */
	66	unsigned char encryyptedto; / Data is encrypted to here */
	67	#endif /* ENCRYPTION */
	68	int size; /* size in bytes of buffer */
	69	u_long consumetime, /* help us keep straight full, empty, etc. */
	70	supplytime;
	71	} Ring;
	72
	73	/* Here are some functions and macros to deal with the ring buffer */
	74
	75	/* Initialization routine */
	76	extern int
	77	ring_init(Ring ring, unsigned char buffer, int count);
	78
	79	/* Data movement routines */
	80	extern void
	81	ring_supply_data(Ring ring, unsigned char buffer, int count);
	82	#ifdef notdef
	83	extern void
	84	ring_consume_data(Ring ring, unsigned char buffer, int count);
	85	#endif
	86
	87	/* Buffer state transition routines */
	88	extern void
	89	ring_supplied(Ring *ring, int count),
	90	ring_consumed(Ring *ring, int count);
	91
	92	/* Buffer state query routines */
	93	extern int
	94	ring_at_mark(Ring *),
	95	ring_empty_count(Ring *ring),
	96	ring_empty_consecutive(Ring *ring),
	97	ring_full_count(Ring *ring),
	98	ring_full_consecutive(Ring *ring);
	99
	100	#ifdef ENCRYPTION
	101	extern void
	102	ring_encrypt(Ring ring, void (func)(unsigned char *, int)),
	103	ring_clearto(Ring *ring);
	104	#endif /* ENCRYPTION */
	105
	106	extern void
	107	ring_clear_mark(Ring *),
	108	ring_mark(Ring *);