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/*
* bits.h - extract binary data from message buffer
*
* These macros extract bytes, words, longwords, floats, doubles, or
* bitfields of arbitrary length and size from a message that contains
* these items in either MSB-first or LSB-first byte order.
*
* By defining the GET_ORIGIN and PUT_ORIGIN macros before including
* this header, it's possible to change the origin of the indexing.
*
* Assumptions:
* char is 8 bits, short is 16 bits, int is 32 bits, long long is 64 bits,
* float is 32 bits IEEE754, double is 64 bits IEEE754.
*
* The use of fixed-length types in the casts enforces these.
* Both 32- and 64-bit systems with gcc are OK with this set.
*
* This file is Copyright (c)2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*/
#ifndef _GPSD_BITS_H_
#define _GPSD_BITS_H_
#include <stdint.h>
union int_float {
int32_t i;
float f;
};
union long_double {
int64_t l;
double d;
};
#ifndef GET_ORIGIN
#define GET_ORIGIN 0
#endif
#ifndef PUT_ORIGIN
#define PUT_ORIGIN 0
#endif
/* these are independent of byte order */
#define getsb(buf, off) ((int8_t)buf[(off)-(GET_ORIGIN)])
#define getub(buf, off) ((uint8_t)buf[(off)-(GET_ORIGIN)])
#define putbyte(buf,off,b) do {buf[(off)-(PUT_ORIGIN)] = (unsigned char)(b);} while (0)
/* little-endian access */
#define getles16(buf, off) ((int16_t)(((uint16_t)getub((buf), (off)+1) << 8) | (uint16_t)getub((buf), (off))))
#define getleu16(buf, off) ((uint16_t)(((uint16_t)getub((buf), (off)+1) << 8) | (uint16_t)getub((buf), (off))))
#define getles32(buf, off) ((int32_t)(((uint16_t)getleu16((buf), (off)+2) << 16) | (uint16_t)getleu16((buf), (off))))
#define getleu32(buf, off) ((uint32_t)(((uint16_t)getleu16((buf),(off)+2) << 16) | (uint16_t)getleu16((buf), (off))))
#define putle16(buf, off, w) do {putbyte(buf, (off)+1, (uint)(w) >> 8); putbyte(buf, (off), (w));} while (0)
#define putle32(buf, off, l) do {putle16(buf, (off)+2, (uint)(l) >> 16); putle16(buf, (off), (l));} while (0)
#define getles64(buf, off) ((int64_t)(((uint64_t)getleu32(buf, (off)+4) << 32) | getleu32(buf, (off))))
#define getleu64(buf, off) ((uint64_t)(((uint64_t)getleu32(buf, (off)+4) << 32) | getleu32(buf, (off))))
#define getlef(buf, off) (i_f.i = getles32(buf, off), i_f.f)
#define getled(buf, off) (l_d.l = getles64(buf, off), l_d.d)
/* SiRF and most other GPS protocols use big-endian (network byte order) */
#define getbes16(buf, off) ((int16_t)(((uint16_t)getub(buf, (off)) << 8) | (uint16_t)getub(buf, (off)+1)))
#define getbeu16(buf, off) ((uint16_t)(((uint16_t)getub(buf, (off)) << 8) | (uint16_t)getub(buf, (off)+1)))
#define getbes32(buf, off) ((int32_t)(((uint16_t)getbeu16(buf, (off)) << 16) | getbeu16(buf, (off)+2)))
#define getbeu32(buf, off) ((uint32_t)(((uint16_t)getbeu16(buf, (off)) << 16) | getbeu16(buf, (off)+2)))
#define getbes64(buf, off) ((int64_t)(((uint64_t)getbeu32(buf, (off)) << 32) | getbeu32(buf, (off)+4)))
#define getbeu64(buf, off) ((uint64_t)(((uint64_t)getbeu32(buf, (off)) << 32) | getbeu32(buf, (off)+4)))
#define putbe16(buf,off,w) do {putbyte(buf, (off) ,(w) >> 8); putbyte(buf, (off)+1, (w));} while (0)
#define putbe32(buf,off,l) do {putbe16(buf, (off) ,(l) >> 16); putbe16(buf, (off)+2, (l));} while (0)
#define getbef(buf, off) (i_f.i = getbes32(buf, off), i_f.f)
#define getbed(buf, off) (l_d.l = getbes64(buf, off), l_d.d)
/* Zodiac protocol description uses 1-origin indexing by little-endian word */
#define get16z(buf, n) ( (buf[2*(n)-2]) \
| (buf[2*(n)-1] << 8))
#define get32z(buf, n) ( (buf[2*(n)-2]) \
| (buf[2*(n)-1] << 8) \
| (buf[2*(n)+0] << 16) \
| (buf[2*(n)+1] << 24))
#define getstringz(to, from, s, e) \
(void)memcpy(to, from+2*(s)-2, 2*((e)-(s)+1))
/* bitfield extraction */
extern unsigned long long ubits(char buf[], unsigned int, unsigned int);
extern signed long long sbits(char buf[], unsigned int, unsigned int);
#endif /* _GPSD_BITS_H_ */
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