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annotate libutil/osmo_bits.h @ 194:05d01e810217

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libutil: add TFO message gen function based on Osmocom crc8gen
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 16:52:21 -0800
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05d01e810217 libutil: add TFO message gen function based on Osmocom crc8gen
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1 /*
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2 * This include file has been put together from Osmocom (specifically
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3 * libosmocore) header files, containing definitions for bit vector
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4 * manipulation and CRC functions.
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5 */
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6
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7 /* from bits.h */
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8
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9 /*! unpacked bit (0 or 1): 1 bit per byte */
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10 typedef uint8_t ubit_t;
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11
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12 /* from crc8gen.h */
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13
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14 /*! structure describing a given CRC code of max 8 bits */
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15 struct osmo_crc8gen_code {
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16 int bits; /*!< Actual number of bits of the CRC */
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17 uint8_t poly; /*!< Polynom (normal representation, MSB omitted */
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18 uint8_t init; /*!< Initialization value of the CRC state */
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19 uint8_t remainder; /*!< Remainder of the CRC (final XOR) */
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20 };
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21
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22 uint8_t osmo_crc8gen_compute_bits(const struct osmo_crc8gen_code *code,
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23 const ubit_t *in, int len);
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24 int osmo_crc8gen_check_bits(const struct osmo_crc8gen_code *code,
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25 const ubit_t *in, int len, const ubit_t *crc_bits);
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26 void osmo_crc8gen_set_bits(const struct osmo_crc8gen_code *code,
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27 const ubit_t *in, int len, ubit_t *crc_bits);
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28
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29 /*
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30 * Themyscira-added (not Osmocom-originating) functions
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31 * that use the ubit_t defined type that (to our knowledge)
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32 * was invented by Osmocom.
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33 */
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34
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35 void uint16_to_bits(uint16_t word, ubit_t *out, unsigned nbits);