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102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
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Copyright (C) 1995-2025 Free Software Foundation, Inc.
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This file is part of GNU Inetutils.
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GNU Inetutils is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Inetutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see `http://www.gnu.org/licenses/'. */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This defines a structure for a ring buffer.
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*
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* The circular buffer has two parts:
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*(((
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* full: [consume, supply)
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* empty: [supply, consume)
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*]]]
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*
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*/
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typedef struct
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{
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unsigned char *consume, /* where data comes out of */
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*supply, /* where data comes in to */
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*bottom, /* lowest address in buffer */
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*top, /* highest address+1 in buffer */
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*mark; /* marker (user defined) */
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#ifdef ENCRYPTION
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unsigned char *clearto; /* Data to this point is clear text */
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unsigned char *encryyptedto; /* Data is encrypted to here */
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#endif /* ENCRYPTION */
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int size; /* size in bytes of buffer */
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unsigned long consumetime, /* help us keep straight full, empty, etc. */
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supplytime;
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} Ring;
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/* Here are some functions and macros to deal with the ring buffer */
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/* Initialization routine */
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extern int ring_init (Ring * ring, unsigned char *buffer, int count);
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/* Data movement routines */
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extern void ring_supply_data (Ring * ring, unsigned char *buffer, int count);
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/* Buffer state transition routines */
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extern void
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ring_supplied (Ring * ring, int count),
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ring_consumed (Ring * ring, int count);
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/* Buffer state query routines */
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extern int
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ring_empty_count (Ring * ring),
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ring_empty_consecutive (Ring * ring),
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ring_full_count (Ring * ring), ring_full_consecutive (Ring * ring);
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#ifdef ENCRYPTION
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extern void
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ring_encrypt (Ring * ring, void (*encryptor) (unsigned char *, int)),
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ring_clearto (Ring * ring);
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#endif /* ENCRYPTION */
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extern void ring_clear_mark (Ring *);
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extern void ring_mark (Ring *);
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extern int ring_at_mark (Ring *);
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