| Piotr Krysik | 9e2e835 | 2018-02-27 12:16:25 +0100 | [diff] [blame] | 1 | /* |
| 2 | * bit16gen.h |
| 3 | * |
| 4 | * Copyright (C) 2014 Max <max.suraev@fairwaves.co> |
| 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | */ |
| 22 | |
| 23 | #pragma once |
| 24 | |
| 25 | /*! \brief load unaligned n-byte integer (little-endian encoding) into uint16_t |
| 26 | * \param[in] p Buffer where integer is stored |
| 27 | * \param[in] n Number of bytes stored in p |
| 28 | * \returns 16 bit unsigned integer |
| 29 | */ |
| 30 | static inline uint16_t osmo_load16le_ext(const void *p, uint8_t n) |
| 31 | { |
| 32 | uint8_t i; |
| 33 | uint16_t r = 0; |
| 34 | const uint8_t *q = (uint8_t *)p; |
| 35 | for(i = 0; i < n; r |= ((uint16_t)q[i] << (8 * i)), i++); |
| 36 | return r; |
| 37 | } |
| 38 | |
| 39 | /*! \brief load unaligned n-byte integer (big-endian encoding) into uint16_t |
| 40 | * \param[in] p Buffer where integer is stored |
| 41 | * \param[in] n Number of bytes stored in p |
| 42 | * \returns 16 bit unsigned integer |
| 43 | */ |
| 44 | static inline uint16_t osmo_load16be_ext(const void *p, uint8_t n) |
| 45 | { |
| 46 | uint8_t i; |
| 47 | uint16_t r = 0; |
| 48 | const uint8_t *q = (uint8_t *)p; |
| 49 | for(i = 0; i < n; r |= ((uint16_t)q[i] << (16 - 8* (1 + i))), i++); |
| 50 | return r; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | /*! \brief store unaligned n-byte integer (little-endian encoding) from uint16_t |
| 55 | * \param[in] x unsigned 16 bit integer |
| 56 | * \param[out] p Buffer to store integer |
| 57 | * \param[in] n Number of bytes to store |
| 58 | */ |
| 59 | static inline void osmo_store16le_ext(uint16_t x, void *p, uint8_t n) |
| 60 | { |
| 61 | uint8_t i; |
| 62 | uint8_t *q = (uint8_t *)p; |
| 63 | for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++); |
| 64 | } |
| 65 | |
| 66 | /*! \brief store unaligned n-byte integer (big-endian encoding) from uint16_t |
| 67 | * \param[in] x unsigned 16 bit integer |
| 68 | * \param[out] p Buffer to store integer |
| 69 | * \param[in] n Number of bytes to store |
| 70 | */ |
| 71 | static inline void osmo_store16be_ext(uint16_t x, void *p, uint8_t n) |
| 72 | { |
| 73 | uint8_t i; |
| 74 | uint8_t *q = (uint8_t *)p; |
| 75 | for(i = 0; i < n; q[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | /* Convenience function for most-used cases */ |
| 80 | |
| 81 | |
| 82 | /*! \brief load unaligned 16-bit integer (little-endian encoding) */ |
| 83 | static inline uint16_t osmo_load16le(const void *p) |
| 84 | { |
| 85 | return osmo_load16le_ext(p, 16 / 8); |
| 86 | } |
| 87 | |
| 88 | /*! \brief load unaligned 16-bit integer (big-endian encoding) */ |
| 89 | static inline uint16_t osmo_load16be(const void *p) |
| 90 | { |
| 91 | return osmo_load16be_ext(p, 16 / 8); |
| 92 | } |
| 93 | |
| 94 | |
| 95 | /*! \brief store unaligned 16-bit integer (little-endian encoding) */ |
| 96 | static inline void osmo_store16le(uint16_t x, void *p) |
| 97 | { |
| 98 | osmo_store16le_ext(x, p, 16 / 8); |
| 99 | } |
| 100 | |
| 101 | /*! \brief store unaligned 16-bit integer (big-endian encoding) */ |
| 102 | static inline void osmo_store16be(uint16_t x, void *p) |
| 103 | { |
| 104 | osmo_store16be_ext(x, p, 16 / 8); |
| 105 | } |