| /* |
| * bitXXgen.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 |
| |
| #include <osmocom/core/utils.h> |
| |
| /*! load unaligned n-byte integer (little-endian encoding) into uintXX_t, into the least significant octets. |
| * \param[in] p Buffer where integer is stored |
| * \param[in] n Number of bytes stored in p |
| * \returns XX bit unsigned integer |
| */ |
| static inline uintXX_t osmo_loadXXle_ext(const void *p, uint8_t n) |
| { |
| uint8_t i; |
| uintXX_t r = 0; |
| const uint8_t *q = (uint8_t *)p; |
| OSMO_ASSERT(n <= sizeof(r)); |
| for(i = 0; i < n; r |= ((uintXX_t)q[i] << (8 * i)), i++); |
| return r; |
| } |
| |
| /*! load unaligned n-byte integer (big-endian encoding) into uintXX_t, into the MOST significant octets. |
| * WARNING: for n < sizeof(uintXX_t), the result is not returned in the least significant octets, as one might expect. |
| * To always return the same value as fed to osmo_storeXXbe_ext() before, use osmo_loadXXbe_ext_2(). |
| * \param[in] p Buffer where integer is stored |
| * \param[in] n Number of bytes stored in p |
| * \returns XX bit unsigned integer |
| */ |
| static inline uintXX_t osmo_loadXXbe_ext(const void *p, uint8_t n) |
| { |
| uint8_t i; |
| uintXX_t r = 0; |
| const uint8_t *q = (uint8_t *)p; |
| OSMO_ASSERT(n <= sizeof(r)); |
| for(i = 0; i < n; r |= ((uintXX_t)q[i] << (XX - 8* (1 + i))), i++); |
| return r; |
| } |
| |
| /*! load unaligned n-byte integer (big-endian encoding) into uintXX_t, into the least significant octets. |
| * \param[in] p Buffer where integer is stored |
| * \param[in] n Number of bytes stored in p |
| * \returns XX bit unsigned integer |
| */ |
| static inline uintXX_t osmo_loadXXbe_ext_2(const void *p, uint8_t n) |
| { |
| uint8_t i; |
| uintXX_t r = 0; |
| const uint8_t *q = (uint8_t *)p; |
| OSMO_ASSERT(n <= sizeof(r)); |
| for(i = 0; i < n; r |= ((uintXX_t)q[i] << (XX - 8* (1 + i + (sizeof(r) - n)))), i++); |
| return r; |
| } |
| |
| |
| /*! store unaligned n-byte integer (little-endian encoding) from uintXX_t |
| * \param[in] x unsigned XX bit integer |
| * \param[out] p Buffer to store integer |
| * \param[in] n Number of bytes to store |
| */ |
| static inline void osmo_storeXXle_ext(uintXX_t x, void *p, uint8_t n) |
| { |
| uint8_t i; |
| uint8_t *q = (uint8_t *)p; |
| OSMO_ASSERT(n <= sizeof(x)); |
| for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++); |
| } |
| |
| /*! store unaligned n-byte integer (big-endian encoding) from uintXX_t |
| * \param[in] x unsigned XX bit integer |
| * \param[out] p Buffer to store integer |
| * \param[in] n Number of bytes to store |
| */ |
| static inline void osmo_storeXXbe_ext(uintXX_t x, void *p, uint8_t n) |
| { |
| uint8_t i; |
| uint8_t *q = (uint8_t *)p; |
| OSMO_ASSERT(n <= sizeof(x)); |
| for(i = 0; i < n; q[i] = (x >> ((n - 1 - i) * 8)) & 0xFF, i++); |
| } |
| |
| |
| /* Convenience function for most-used cases */ |
| |
| |
| /*! load unaligned XX-bit integer (little-endian encoding) */ |
| static inline uintXX_t osmo_loadXXle(const void *p) |
| { |
| return osmo_loadXXle_ext(p, XX / 8); |
| } |
| |
| /*! load unaligned XX-bit integer (big-endian encoding) */ |
| static inline uintXX_t osmo_loadXXbe(const void *p) |
| { |
| return osmo_loadXXbe_ext(p, XX / 8); |
| } |
| |
| |
| /*! store unaligned XX-bit integer (little-endian encoding) */ |
| static inline void osmo_storeXXle(uintXX_t x, void *p) |
| { |
| osmo_storeXXle_ext(x, p, XX / 8); |
| } |
| |
| /*! store unaligned XX-bit integer (big-endian encoding) */ |
| static inline void osmo_storeXXbe(uintXX_t x, void *p) |
| { |
| osmo_storeXXbe_ext(x, p, XX / 8); |
| } |