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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 1.0 (the 'License'). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License."
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24	/*
	25	* Copyright (c) 1988, 1993
	26	* The Regents of the University of California. All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*
	56	* @(#)ring.h 8.1 (Berkeley) 6/6/93
	57	*/
	58
	59	#if defined(P)
	60	# undef P
	61	#endif
	62
	63	#if defined(__STDC__) \|\| defined(LINT_ARGS)
	64	# define P(x) x
	65	#else
	66	# define P(x) ()
	67	#endif
	68
	69	/*
	70	* This defines a structure for a ring buffer.
	71	*
	72	* The circular buffer has two parts:
	73	*(((
	74	* full: [consume, supply)
	75	* empty: [supply, consume)
	76	*]]]
	77	*
	78	*/
	79	typedef struct {
	80	unsigned char consume, / where data comes out of */
	81	supply, / where data comes in to */
	82	bottom, / lowest address in buffer */
	83	top, / highest address+1 in buffer */
	84	mark; / marker (user defined) */
	85	#ifdef ENCRYPTION
	86	unsigned char clearto; / Data to this point is clear text */
	87	unsigned char encryyptedto; / Data is encrypted to here */
	88	#endif /* ENCRYPTION */
	89	int size; /* size in bytes of buffer */
	90	u_long consumetime, /* help us keep straight full, empty, etc. */
	91	supplytime;
	92	} Ring;
	93
	94	/* Here are some functions and macros to deal with the ring buffer */
	95
	96	/* Initialization routine */
	97	extern int
	98	ring_init P((Ring ring, unsigned char buffer, int count));
	99
	100	/* Data movement routines */
	101	extern void
	102	ring_supply_data P((Ring ring, unsigned char buffer, int count));
	103	#ifdef notdef
	104	extern void
	105	ring_consume_data P((Ring ring, unsigned char buffer, int count));
	106	#endif
	107
	108	/* Buffer state transition routines */
	109	extern void
	110	ring_supplied P((Ring *ring, int count)),
	111	ring_consumed P((Ring *ring, int count));
	112
	113	/* Buffer state query routines */
	114	extern int
	115	ring_empty_count P((Ring *ring)),
	116	ring_empty_consecutive P((Ring *ring)),
	117	ring_full_count P((Ring *ring)),
	118	ring_full_consecutive P((Ring *ring));
	119
	120	#ifdef ENCRYPTION
	121	extern void
	122	ring_encrypt P((Ring ring, void (func)())),
	123	ring_clearto P((Ring *ring));
	124	#endif /* ENCRYPTION */
	125
	126	extern void
	127	ring_clear_mark(),
	128	ring_mark();