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Utils.cpp
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Utils.cpp
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/*
* Copyright (C) 2015 by Jonathan Naylor G4KLX
* Copyright (C) 2017 by Andy Uribe CA6JAU
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Utils.h"
const uint8_t BITS_TABLE[] = {
# define B2(n) n, n+1, n+1, n+2
# define B4(n) B2(n), B2(n+1), B2(n+1), B2(n+2)
# define B6(n) B4(n), B4(n+1), B4(n+1), B4(n+2)
B6(0), B6(1), B6(1), B6(2)
};
uint8_t countBits8(uint8_t bits)
{
return BITS_TABLE[bits];
}
uint8_t countBits32(uint32_t bits)
{
uint8_t* p = (uint8_t*)&bits;
uint8_t n = 0U;
n += BITS_TABLE[p[0U]];
n += BITS_TABLE[p[1U]];
n += BITS_TABLE[p[2U]];
n += BITS_TABLE[p[3U]];
return n;
}
uint8_t countBits64(uint64_t bits)
{
uint8_t* p = (uint8_t*)&bits;
uint8_t n = 0U;
n += BITS_TABLE[p[0U]];
n += BITS_TABLE[p[1U]];
n += BITS_TABLE[p[2U]];
n += BITS_TABLE[p[3U]];
n += BITS_TABLE[p[4U]];
n += BITS_TABLE[p[5U]];
n += BITS_TABLE[p[6U]];
n += BITS_TABLE[p[7U]];
return n;
}
#if defined(ENABLE_DEBUG)
// Simple functions to convert from int to string
// Example from: https://stackoverflow.com/questions/8257714/how-to-convert-an-int-to-string-in-c
static uint8_t *i2str_helper(uint8_t *dest, uint32_t n, int32_t x) {
if (n == 0) {
return NULL;
}
if (x <= -10) {
dest = i2str_helper(dest, n - 1, x / 10);
if (dest == NULL) return NULL;
}
*dest = (uint8_t) ('0' - x % 10);
return dest + 1;
}
uint8_t *i2str(uint8_t *dest, uint32_t n, int32_t x) {
uint8_t *p = dest;
if (n == 0) {
return NULL;
}
n--;
x = -x;
p = i2str_helper(p, n, x);
if (p == NULL) return NULL;
*p = 0;
return dest;
}
#endif