mirror of
https://github.com/obgm/libcoap.git
synced 2026-11-05 17:32:54 +03:00
jcmichelou
bcfd7a0753
Make coap_pdu-t independent of the header style. Use C99 sized types when applicable. Use transaction ids in host byte order in the library. Make coap_pdu_t payload storage grow on demand. Add parsing and encoding of PDUs with UDP or TCP style headers. Adapt examples and unit tests to the new PDU format.
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* encode.h -- encoding and decoding of CoAP data types
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*
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* Copyright (C) 2010-2012 Olaf Bergmann <bergmann@tzi.org>
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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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) || defined(WITH_CONTIKI) || defined(_WIN32)
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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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#include <stdint.h>
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#define Nn 8 /* duplicate definition of N if built on sky motes */
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#define ENCODE_HEADER_SIZE 4
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#define HIBIT (1 << (Nn - 1))
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#define EMASK ((1 << ENCODE_HEADER_SIZE) - 1)
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#define MMASK ((1 << Nn) - 1 - EMASK)
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#define MAX_VALUE ( (1 << Nn) - (1 << ENCODE_HEADER_SIZE) ) * (1 << ((1 << ENCODE_HEADER_SIZE) - 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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#ifndef HAVE_FLSLL
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/* include this only if flsll() is not available */
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extern int coap_flsll(long long i);
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#else
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#define coap_flsll(i) flsll(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) - Nn, (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) - Nn, (s = (((v + ((1<<ENCODE_HEADER_SIZE<<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 sequence
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* of length len. Returns the decoded value.
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*/
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unsigned int coap_decode_var_bytes(const uint8_t *buf, unsigned int len);
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/**
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* Encodes multiple-length byte sequences. buf points to an output buffer of
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* sufficient length to store the encoded bytes. val is the value to encode.
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* Returns the number of bytes used to encode val or 0 on error.
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*/
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unsigned int coap_encode_var_bytes(uint8_t *buf, unsigned int val);
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#endif /* _COAP_ENCODE_H_ */
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