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/*
* bit64gen.h
*
* Copyright (C) 2014 Max <max.suraev@fairwaves.co>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
/*! \brief load unaligned n-byte integer (little-endian encoding) into uint64_t
* \param[in] p Buffer where integer is stored
* \param[in] n Number of bytes stored in p
* \returns 64 bit unsigned integer
*/
static inline uint64_t osmo_load64le_ext(const void *p, uint8_t n)
{
uint8_t i;
uint64_t r = 0;
const uint8_t *q = (uint8_t *)p;
for(i = 0; i < n; r |= ((uint64_t)q[i] << (8 * i)), i++);
return r;
}
/*! \brief load unaligned n-byte integer (big-endian encoding) into uint64_t
* \param[in] p Buffer where integer is stored
* \param[in] n Number of bytes stored in p
* \returns 64 bit unsigned integer
*/
static inline uint64_t osmo_load64be_ext(const void *p, uint8_t n)
{
uint8_t i;
uint64_t r = 0;
const uint8_t *q = (uint8_t *)p;
for(i = 0; i < n; r |= ((uint64_t)q[i] << (64 - 8* (1 + i))), i++);
return r;
}
/*! \brief store unaligned n-byte integer (little-endian encoding) from uint64_t
* \param[in] x unsigned 64 bit integer
* \param[out] p Buffer to store integer
* \param[in] n Number of bytes to store
*/
static inline void osmo_store64le_ext(uint64_t x, void *p, uint8_t n)
{
uint8_t i;
uint8_t *q = (uint8_t *)p;
for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++);
}
/*! \brief store unaligned n-byte integer (big-endian encoding) from uint64_t
* \param[in] x unsigned 64 bit integer
* \param[out] p Buffer to store integer
* \param[in] n Number of bytes to store
*/
static inline void osmo_store64be_ext(uint64_t x, void *p, uint8_t n)
{
uint8_t i;
uint8_t *q = (uint8_t *)p;
for(i = 0; i < n; q[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++);
}
/* Convenience function for most-used cases */
/*! \brief load unaligned 64-bit integer (little-endian encoding) */
static inline uint64_t osmo_load64le(const void *p)
{
return osmo_load64le_ext(p, 64 / 8);
}
/*! \brief load unaligned 64-bit integer (big-endian encoding) */
static inline uint64_t osmo_load64be(const void *p)
{
return osmo_load64be_ext(p, 64 / 8);
}
/*! \brief store unaligned 64-bit integer (little-endian encoding) */
static inline void osmo_store64le(uint64_t x, void *p)
{
osmo_store64le_ext(x, p, 64 / 8);
}
/*! \brief store unaligned 64-bit integer (big-endian encoding) */
static inline void osmo_store64be(uint64_t x, void *p)
{
osmo_store64be_ext(x, p, 64 / 8);
}
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