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https://github.com/obgm/libcoap.git
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Olaf Bergmann
758b7f775e
* 0001-Trailing-whitespace-cleanup.patch * 0001-Went-back-to-2.65-of-autoconf.patch * 0002-Fix-compiler-warning-for-str.patch * added several files to Makefile target .gitignore
64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* encode.h -- encoding and decoding of CoAP data types
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*
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* Copyright (C) 2010 Olaf Bergmann <bergmann@tzi.org>, Carsten Bormann
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _COAP_ENCODE_H_
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#define _COAP_ENCODE_H_
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#if (BSD >= 199103)
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# include <string.h>
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#else
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# include <strings.h>
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#endif
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#define N 8
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#define E 4
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#define HIBIT (1 << (N - 1))
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#define EMASK ((1 << E) - 1)
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#define MMASK ((1 << N) - 1 - EMASK)
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#define MAX_VALUE ( (1 << N) - (1 << E) ) * (1 << ((1 << E) - 1))
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#define COAP_PSEUDOFP_DECODE_8_4(r) (r < HIBIT ? r : (r & MMASK) << (r & EMASK))
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#ifndef HAVE_FLS
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/* include this only if fls() is not available */
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extern int coap_fls(unsigned int i);
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#else
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#define coap_fls(i) fls(i)
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#endif
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/* ls and s must be integer variables */
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#define COAP_PSEUDOFP_ENCODE_8_4_DOWN(v,ls) (v < HIBIT ? v : (ls = coap_fls(v) - N, (v >> ls) & MMASK) + ls)
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#define COAP_PSEUDOFP_ENCODE_8_4_UP(v,ls,s) (v < HIBIT ? v : (ls = coap_fls(v) - N, (s = (((v + ((1<<E<<ls)-1)) >> ls) & MMASK)), s == 0 ? HIBIT + ls + 1 : s + ls))
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/**
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* Decodes multiple-length byte sequences. buf points to an input byte
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* sequence of length len. Returns the decoded value.
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*/
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unsigned int coap_decode_var_bytes(unsigned char *buf,unsigned int len);
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/**
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* Encodes multiple-length byte sequences. buf points to an output
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* buffer of sufficient length to store the encoded bytes. val is
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* the value to encode. Returns the number of bytes used to encode
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* val or 0 on error.
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*/
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unsigned int coap_encode_var_bytes(unsigned char *buf, unsigned int val);
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#endif /* _COAP_ENCODE_H_ */
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