mirror of
https://github.com/0xFEEDC0DE64/arduino-esp32.git
synced 2025-10-31 14:11:42 +01:00
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
|
/*
|
||
|
|
* encode.h -- encoding and decoding of CoAP data types
|
||
|
|
*
|
||
|
|
* Copyright (C) 2010-2012 Olaf Bergmann <bergmann@tzi.org>
|
||
|
|
*
|
||
|
|
* This file is part of the CoAP library libcoap. Please see README for terms
|
||
|
|
* of use.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _COAP_ENCODE_H_
|
||
|
|
#define _COAP_ENCODE_H_
|
||
|
|
|
||
|
|
#if (BSD >= 199103) || defined(WITH_CONTIKI)
|
||
|
|
# include <string.h>
|
||
|
|
#else
|
||
|
|
# include <strings.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define Nn 8 /* duplicate definition of N if built on sky motes */
|
||
|
|
#define ENCODE_HEADER_SIZE 4
|
||
|
|
#define HIBIT (1 << (Nn - 1))
|
||
|
|
#define EMASK ((1 << ENCODE_HEADER_SIZE) - 1)
|
||
|
|
#define MMASK ((1 << Nn) - 1 - EMASK)
|
||
|
|
#define MAX_VALUE ( (1 << Nn) - (1 << ENCODE_HEADER_SIZE) ) * (1 << ((1 << ENCODE_HEADER_SIZE) - 1))
|
||
|
|
|
||
|
|
#define COAP_PSEUDOFP_DECODE_8_4(r) (r < HIBIT ? r : (r & MMASK) << (r & EMASK))
|
||
|
|
|
||
|
|
#ifndef HAVE_FLS
|
||
|
|
/* include this only if fls() is not available */
|
||
|
|
extern int coap_fls(unsigned int i);
|
||
|
|
#else
|
||
|
|
#define coap_fls(i) fls(i)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ls and s must be integer variables */
|
||
|
|
#define COAP_PSEUDOFP_ENCODE_8_4_DOWN(v,ls) (v < HIBIT ? v : (ls = coap_fls(v) - Nn, (v >> ls) & MMASK) + ls)
|
||
|
|
#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))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decodes multiple-length byte sequences. buf points to an input byte sequence
|
||
|
|
* of length len. Returns the decoded value.
|
||
|
|
*/
|
||
|
|
unsigned int coap_decode_var_bytes(unsigned char *buf,unsigned int len);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Encodes multiple-length byte sequences. buf points to an output buffer of
|
||
|
|
* sufficient length to store the encoded bytes. val is the value to encode.
|
||
|
|
* Returns the number of bytes used to encode val or 0 on error.
|
||
|
|
*/
|
||
|
|
unsigned int coap_encode_var_bytes(unsigned char *buf, unsigned int val);
|
||
|
|
|
||
|
|
#endif /* _COAP_ENCODE_H_ */
|