| /* |
| * bit32gen.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 uint32_t |
| * \param[in] p Buffer where integer is stored |
| * \param[in] n Number of bytes stored in p |
| * \returns 32 bit unsigned integer |
| */ |
| static inline uint32_t osmo_load32le_ext(const void *p, uint8_t n) |
| { |
| uint8_t i; |
| uint32_t r = 0; |
| const uint8_t *q = (uint8_t *)p; |
| for(i = 0; i < n; r |= ((uint32_t)q[i] << (8 * i)), i++); |
| return r; |
| } |
| |
| /*! \brief load unaligned n-byte integer (big-endian encoding) into uint32_t |
| * \param[in] p Buffer where integer is stored |
| * \param[in] n Number of bytes stored in p |
| * \returns 32 bit unsigned integer |
| */ |
| static inline uint32_t osmo_load32be_ext(const void *p, uint8_t n) |
| { |
| uint8_t i; |
| uint32_t r = 0; |
| const uint8_t *q = (uint8_t *)p; |
| for(i = 0; i < n; r |= ((uint32_t)q[i] << (32 - 8* (1 + i))), i++); |
| return r; |
| } |
| |
| |
| /*! \brief store unaligned n-byte integer (little-endian encoding) from uint32_t |
| * \param[in] x unsigned 32 bit integer |
| * \param[out] p Buffer to store integer |
| * \param[in] n Number of bytes to store |
| */ |
| static inline void osmo_store32le_ext(uint32_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 uint32_t |
| * \param[in] x unsigned 32 bit integer |
| * \param[out] p Buffer to store integer |
| * \param[in] n Number of bytes to store |
| */ |
| static inline void osmo_store32be_ext(uint32_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 32-bit integer (little-endian encoding) */ |
| static inline uint32_t osmo_load32le(const void *p) |
| { |
| return osmo_load32le_ext(p, 32 / 8); |
| } |
| |
| /*! \brief load unaligned 32-bit integer (big-endian encoding) */ |
| static inline uint32_t osmo_load32be(const void *p) |
| { |
| return osmo_load32be_ext(p, 32 / 8); |
| } |
| |
| |
| /*! \brief store unaligned 32-bit integer (little-endian encoding) */ |
| static inline void osmo_store32le(uint32_t x, void *p) |
| { |
| osmo_store32le_ext(x, p, 32 / 8); |
| } |
| |
| /*! \brief store unaligned 32-bit integer (big-endian encoding) */ |
| static inline void osmo_store32be(uint32_t x, void *p) |
| { |
| osmo_store32be_ext(x, p, 32 / 8); |
| } |