mirror of https://gerrit.osmocom.org/libosmocore
125 lines
3.7 KiB
Smarty
125 lines
3.7 KiB
Smarty
/*
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* bitXXgen.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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#pragma once
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#include <osmocom/core/utils.h>
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/*! load unaligned n-byte integer (little-endian encoding) into uintXX_t, into the least significant octets.
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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 XX bit unsigned integer
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*/
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static inline uintXX_t osmo_loadXXle_ext(const void *p, uint8_t n)
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{
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uint8_t i;
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uintXX_t r = 0;
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const uint8_t *q = (uint8_t *)p;
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OSMO_ASSERT(n <= sizeof(r));
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for(i = 0; i < n; r |= ((uintXX_t)q[i] << (8 * i)), i++);
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return r;
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}
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/*! load unaligned n-byte integer (big-endian encoding) into uintXX_t, into the MOST significant octets.
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* WARNING: for n < sizeof(uintXX_t), the result is not returned in the least significant octets, as one might expect.
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* To always return the same value as fed to osmo_storeXXbe_ext() before, use osmo_loadXXbe_ext_2().
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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 XX bit unsigned integer
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*/
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static inline uintXX_t osmo_loadXXbe_ext(const void *p, uint8_t n)
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{
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uint8_t i;
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uintXX_t r = 0;
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const uint8_t *q = (uint8_t *)p;
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OSMO_ASSERT(n <= sizeof(r));
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for(i = 0; i < n; r |= ((uintXX_t)q[i] << (XX - 8* (1 + i))), i++);
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return r;
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}
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/*! load unaligned n-byte integer (big-endian encoding) into uintXX_t, into the least significant octets.
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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 XX bit unsigned integer
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*/
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static inline uintXX_t osmo_loadXXbe_ext_2(const void *p, uint8_t n)
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{
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uint8_t i;
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uintXX_t r = 0;
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const uint8_t *q = (uint8_t *)p;
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OSMO_ASSERT(n <= sizeof(r));
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for(i = 0; i < n; r |= ((uintXX_t)q[i] << (XX - 8* (1 + i + (sizeof(r) - n)))), i++);
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return r;
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}
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/*! store unaligned n-byte integer (little-endian encoding) from uintXX_t
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* \param[in] x unsigned XX 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_storeXXle_ext(uintXX_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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OSMO_ASSERT(n <= sizeof(x));
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for(i = 0; i < n; q[i] = (x >> i * 8) & 0xFF, i++);
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}
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/*! store unaligned n-byte integer (big-endian encoding) from uintXX_t
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* \param[in] x unsigned XX 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_storeXXbe_ext(uintXX_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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OSMO_ASSERT(n <= sizeof(x));
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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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/*! load unaligned XX-bit integer (little-endian encoding) */
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static inline uintXX_t osmo_loadXXle(const void *p)
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{
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return osmo_loadXXle_ext(p, XX / 8);
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}
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/*! load unaligned XX-bit integer (big-endian encoding) */
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static inline uintXX_t osmo_loadXXbe(const void *p)
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{
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return osmo_loadXXbe_ext(p, XX / 8);
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}
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/*! store unaligned XX-bit integer (little-endian encoding) */
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static inline void osmo_storeXXle(uintXX_t x, void *p)
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{
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osmo_storeXXle_ext(x, p, XX / 8);
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}
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/*! store unaligned XX-bit integer (big-endian encoding) */
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static inline void osmo_storeXXbe(uintXX_t x, void *p)
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{
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osmo_storeXXbe_ext(x, p, XX / 8);
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}
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