106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
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* bit16gen.h
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*
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* Copyright (C) 2014 Max <max.suraev@fairwaves.co>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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/*! \brief load unaligned n-byte integer (little-endian encoding) into uint16_t
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* \param[in] p Buffer where integer is stored
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* \param[in] n Number of bytes stored in p
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* \returns 16 bit unsigned integer
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*/
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static inline uint16_t osmo_load16le_ext(const void *p, uint8_t n)
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{
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uint8_t i;
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uint16_t r = 0;
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const uint8_t *q = (uint8_t *)p;
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for(i = 0; i < n; r |= ((uint16_t)q[i] << (8 * i)), i++);
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return r;
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}
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/*! \brief load unaligned n-byte integer (big-endian encoding) into uint16_t
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* \param[in] p Buffer where integer is stored
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* \param[in] n Number of bytes stored in p
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* \returns 16 bit unsigned integer
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*/
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static inline uint16_t osmo_load16be_ext(const void *p, uint8_t n)
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{
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uint8_t i;
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uint16_t r = 0;
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const uint8_t *q = (uint8_t *)p;
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for(i = 0; i < n; r |= ((uint16_t)q[i] << (16 - 8* (1 + i))), i++);
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return r;
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}
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/*! \brief store unaligned n-byte integer (little-endian encoding) from uint16_t
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* \param[in] x unsigned 16 bit integer
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* \param[out] p Buffer to store integer
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* \param[in] n Number of bytes to store
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*/
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static inline void osmo_store16le_ext(uint16_t x, void *p, uint8_t n)
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{
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uint8_t i;
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uint8_t *q = (uint8_t *)p;
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for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++);
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}
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/*! \brief store unaligned n-byte integer (big-endian encoding) from uint16_t
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* \param[in] x unsigned 16 bit integer
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* \param[out] p Buffer to store integer
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* \param[in] n Number of bytes to store
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*/
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static inline void osmo_store16be_ext(uint16_t x, void *p, uint8_t n)
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{
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uint8_t i;
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uint8_t *q = (uint8_t *)p;
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for(i = 0; i < n; q[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++);
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}
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/* Convenience function for most-used cases */
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/*! \brief load unaligned 16-bit integer (little-endian encoding) */
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static inline uint16_t osmo_load16le(const void *p)
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{
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return osmo_load16le_ext(p, 16 / 8);
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}
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/*! \brief load unaligned 16-bit integer (big-endian encoding) */
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static inline uint16_t osmo_load16be(const void *p)
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{
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return osmo_load16be_ext(p, 16 / 8);
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}
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/*! \brief store unaligned 16-bit integer (little-endian encoding) */
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static inline void osmo_store16le(uint16_t x, void *p)
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{
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osmo_store16le_ext(x, p, 16 / 8);
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}
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/*! \brief store unaligned 16-bit integer (big-endian encoding) */
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static inline void osmo_store16be(uint16_t x, void *p)
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{
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osmo_store16be_ext(x, p, 16 / 8);
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}
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