2 * Copyright (c) 1988, 1993
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15 * This product includes software developed by the University of
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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 $
42 #if defined(__STDC__) || defined(LINT_ARGS)
49 * This defines a structure for a ring buffer.
51 * The circular buffer has two parts:
53 * full: [consume, supply)
54 * empty: [supply, consume)
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) */
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. */
73 /* Here are some functions and macros to deal with the ring buffer */
75 /* Initialization routine */
77 ring_init(Ring *ring, unsigned char *buffer, int count);
79 /* Data movement routines */
81 ring_supply_data(Ring *ring, unsigned char *buffer, int count);
84 ring_consume_data(Ring *ring, unsigned char *buffer, int count);
87 /* Buffer state transition routines */
89 ring_supplied(Ring *ring, int count),
90 ring_consumed(Ring *ring, int count);
92 /* Buffer state query routines */
95 ring_empty_count(Ring *ring),
96 ring_empty_consecutive(Ring *ring),
97 ring_full_count(Ring *ring),
98 ring_full_consecutive(Ring *ring);
102 ring_encrypt(Ring *ring, void (*func)(unsigned char *, int)),
103 ring_clearto(Ring *ring);
104 #endif /* ENCRYPTION */
107 ring_clear_mark(Ring *),