143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* dtls -- a very basic DTLS implementation
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*
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* Copyright (C) 2011 Olaf Bergmann <bergmann@tzi.org>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _DTLS_NUMERIC_H_
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#define _DTLS_NUMERIC_H_
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#include <stdint.h>
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#ifndef min
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#define min(A,B) ((A) <= (B) ? (A) : (B))
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#endif
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#ifndef max
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#define max(A,B) ((A) < (B) ? (B) : (A))
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#endif
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/* this one is for consistency... */
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static inline int dtls_int_to_uint8(unsigned char *field, uint8_t value)
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{
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field[0] = value & 0xff;
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return 1;
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}
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static inline int dtls_int_to_uint16(unsigned char *field, uint16_t value)
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{
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field[0] = (value >> 8) & 0xff;
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field[1] = value & 0xff;
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return 2;
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}
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static inline int dtls_int_to_uint24(unsigned char *field, uint32_t value)
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{
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field[0] = (value >> 16) & 0xff;
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field[1] = (value >> 8) & 0xff;
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field[2] = value & 0xff;
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return 3;
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}
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static inline int dtls_int_to_uint32(unsigned char *field, uint32_t value)
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{
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field[0] = (value >> 24) & 0xff;
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field[1] = (value >> 16) & 0xff;
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field[2] = (value >> 8) & 0xff;
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field[3] = value & 0xff;
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return 4;
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}
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static inline int dtls_int_to_uint48(unsigned char *field, uint64_t value)
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{
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field[0] = (value >> 40) & 0xff;
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field[1] = (value >> 32) & 0xff;
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field[2] = (value >> 24) & 0xff;
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field[3] = (value >> 16) & 0xff;
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field[4] = (value >> 8) & 0xff;
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field[5] = value & 0xff;
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return 6;
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}
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static inline int dtls_int_to_uint64(unsigned char *field, uint64_t value)
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{
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field[0] = (value >> 56) & 0xff;
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field[1] = (value >> 48) & 0xff;
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field[2] = (value >> 40) & 0xff;
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field[3] = (value >> 32) & 0xff;
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field[4] = (value >> 24) & 0xff;
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field[5] = (value >> 16) & 0xff;
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field[6] = (value >> 8) & 0xff;
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field[7] = value & 0xff;
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return 8;
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}
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static inline uint8_t dtls_uint8_to_int(const unsigned char *field)
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{
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return (uint8_t)field[0];
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}
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static inline uint16_t dtls_uint16_to_int(const unsigned char *field)
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{
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return ((uint16_t)field[0] << 8)
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| (uint16_t)field[1];
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}
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static inline uint32_t dtls_uint24_to_int(const unsigned char *field)
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{
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return ((uint32_t)field[0] << 16)
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| ((uint32_t)field[1] << 8)
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| (uint32_t)field[2];
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}
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static inline uint32_t dtls_uint32_to_int(const unsigned char *field)
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{
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return ((uint32_t)field[0] << 24)
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| ((uint32_t)field[1] << 16)
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| ((uint32_t)field[2] << 8)
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| (uint32_t)field[3];
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}
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static inline uint64_t dtls_uint48_to_int(const unsigned char *field)
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{
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return ((uint64_t)field[0] << 40)
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| ((uint64_t)field[1] << 32)
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| ((uint64_t)field[2] << 24)
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| ((uint64_t)field[3] << 16)
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| ((uint64_t)field[4] << 8)
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| (uint64_t)field[5];
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}
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static inline uint64_t dtls_uint64_to_int(const unsigned char *field)
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{
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return ((uint64_t)field[0] << 56)
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| ((uint64_t)field[1] << 48)
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| ((uint64_t)field[2] << 40)
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| ((uint64_t)field[3] << 32)
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| ((uint64_t)field[4] << 24)
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| ((uint64_t)field[5] << 16)
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| ((uint64_t)field[6] << 8)
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| (uint64_t)field[7];
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}
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#endif /* _DTLS_NUMERIC_H_ */
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