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40f53fa8d9
own CVS tree will help minimize CVS conflicts. Maybe not. Blame Graff for getting me to trim all trailing whitespace.
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
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* Copyright (C) 1999, 2000 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: bitstring.h,v 1.5 2000/08/01 01:30:00 tale Exp $ */
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#ifndef ISC_BITSTRING_H
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#define ISC_BITSTRING_H 1
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/*****
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***** Module Info
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*****/
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/***
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*** Imports
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***/
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#include <isc/lang.h>
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#include <isc/types.h>
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ISC_LANG_BEGINDECLS
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/***
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*** Types
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***/
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struct isc_bitstring {
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unsigned int magic;
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unsigned char * data;
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unsigned int length;
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unsigned int size;
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isc_boolean_t lsb0;
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};
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/***
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*** Functions
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***/
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void
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isc_bitstring_init(isc_bitstring_t *bitstring, unsigned char *data,
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unsigned int length, unsigned int size, isc_boolean_t lsb0);
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/*
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* Make 'bitstring' refer to the bitstring of 'size' bits starting
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* at 'data'. 'length' bits of the bitstring are valid. If 'lsb0'
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* is set then, bit 0 refers to the least significant bit of the
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* bitstring. Otherwise bit 0 is the most significant bit.
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*
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* Requires:
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*
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* 'bitstring' points to a isc_bitstring_t.
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*
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* 'data' points to an array of unsigned char large enough to hold
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* 'size' bits.
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*
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* 'length' <= 'size'.
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*
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* Ensures:
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*
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* 'bitstring' is a valid bitstring.
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*/
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void
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isc_bitstring_invalidate(isc_bitstring_t *bitstring);
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/*
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* Invalidate 'bitstring'.
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*
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* Requires:
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*
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* 'bitstring' is a valid bitstring.
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*
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* Ensures:
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*
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* 'bitstring' is not a valid bitstring.
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*/
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void
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isc_bitstring_copy(isc_bitstring_t *source, unsigned int sbitpos,
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isc_bitstring_t *target, unsigned int tbitpos,
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unsigned int n);
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/*
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* Starting at bit 'sbitpos', copy 'n' bits from 'source' to
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* the 'n' bits of 'target' starting at 'tbitpos'.
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*
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* Requires:
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*
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* 'source' and target are valid bitstring.
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*
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* 'sbitpos' + 'n' is less than or equal to the length of 'source'.
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*
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* 'tbitpos' + 'n' is less than or equal to the size of 'target'.
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*
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* Ensures:
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*
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* The specified bits have been copied, and the length of 'target'
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* adjusted (if required).
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*/
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ISC_LANG_ENDDECLS
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#endif /* ISC_BITSTRING_H */
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