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Diffstat (limited to 'lib/decoding/osmocom/core/bit16gen.h')
-rw-r--r-- | lib/decoding/osmocom/core/bit16gen.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/decoding/osmocom/core/bit16gen.h b/lib/decoding/osmocom/core/bit16gen.h new file mode 100644 index 0000000..5c6162c --- /dev/null +++ b/lib/decoding/osmocom/core/bit16gen.h @@ -0,0 +1,105 @@ +/* + * bit16gen.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 uint16_t + * \param[in] p Buffer where integer is stored + * \param[in] n Number of bytes stored in p + * \returns 16 bit unsigned integer + */ +static inline uint16_t osmo_load16le_ext(const void *p, uint8_t n) +{ + uint8_t i; + uint16_t r = 0; + const uint8_t *q = (uint8_t *)p; + for(i = 0; i < n; r |= ((uint16_t)q[i] << (8 * i)), i++); + return r; +} + +/*! \brief load unaligned n-byte integer (big-endian encoding) into uint16_t + * \param[in] p Buffer where integer is stored + * \param[in] n Number of bytes stored in p + * \returns 16 bit unsigned integer + */ +static inline uint16_t osmo_load16be_ext(const void *p, uint8_t n) +{ + uint8_t i; + uint16_t r = 0; + const uint8_t *q = (uint8_t *)p; + for(i = 0; i < n; r |= ((uint16_t)q[i] << (16 - 8* (1 + i))), i++); + return r; +} + + +/*! \brief store unaligned n-byte integer (little-endian encoding) from uint16_t + * \param[in] x unsigned 16 bit integer + * \param[out] p Buffer to store integer + * \param[in] n Number of bytes to store + */ +static inline void osmo_store16le_ext(uint16_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 uint16_t + * \param[in] x unsigned 16 bit integer + * \param[out] p Buffer to store integer + * \param[in] n Number of bytes to store + */ +static inline void osmo_store16be_ext(uint16_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 16-bit integer (little-endian encoding) */ +static inline uint16_t osmo_load16le(const void *p) +{ + return osmo_load16le_ext(p, 16 / 8); +} + +/*! \brief load unaligned 16-bit integer (big-endian encoding) */ +static inline uint16_t osmo_load16be(const void *p) +{ + return osmo_load16be_ext(p, 16 / 8); +} + + +/*! \brief store unaligned 16-bit integer (little-endian encoding) */ +static inline void osmo_store16le(uint16_t x, void *p) +{ + osmo_store16le_ext(x, p, 16 / 8); +} + +/*! \brief store unaligned 16-bit integer (big-endian encoding) */ +static inline void osmo_store16be(uint16_t x, void *p) +{ + osmo_store16be_ext(x, p, 16 / 8); +} |