Harald Welte | c436245 | 2010-03-22 22:25:13 +0800 | [diff] [blame] | 1 | #ifndef _BITVEC_H |
| 2 | #define _BITVEC_H |
| 3 | |
| 4 | /* bit vector utility routines */ |
| 5 | |
| 6 | /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| 7 | * |
| 8 | * All Rights Reserved |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | /* In GSM mac blocks, every bit can be 0 or 1, or L or H. L/H are |
| 28 | * defined relative to the 0x2b padding pattern */ |
| 29 | enum bit_value { |
| 30 | ZERO = 0, |
| 31 | ONE = 1, |
| 32 | L = 2, |
| 33 | H = 3, |
| 34 | }; |
| 35 | |
| 36 | struct bitvec { |
| 37 | unsigned int cur_bit; /* curser to the next unused bit */ |
| 38 | unsigned int data_len; /* length of data array in bytes */ |
| 39 | uint8_t *data; /* pointer to data array */ |
| 40 | }; |
| 41 | |
| 42 | /* check if the bit is 0 or 1 for a given position inside a bitvec */ |
| 43 | enum bit_value bitvec_get_bit_pos(const struct bitvec *bv, unsigned int bitnr); |
| 44 | |
| 45 | /* get the Nth set bit inside the bit vector */ |
| 46 | unsigned int bitvec_get_nth_set_bit(const struct bitvec *bv, unsigned int n); |
| 47 | |
| 48 | /* Set a bit at given position */ |
| 49 | int bitvec_set_bit_pos(struct bitvec *bv, unsigned int bitnum, |
| 50 | enum bit_value bit); |
| 51 | |
| 52 | /* Set the next bit in the vector */ |
| 53 | int bitvec_set_bit(struct bitvec *bv, enum bit_value bit); |
| 54 | |
| 55 | /* Set multiple bits at the current position */ |
| 56 | int bitvec_set_bits(struct bitvec *bv, enum bit_value *bits, int count); |
| 57 | |
| 58 | /* Add an unsigned integer (of length count bits) to current position */ |
| 59 | int bitvec_set_uint(struct bitvec *bv, unsigned int in, int count); |
| 60 | |
| 61 | |
| 62 | /* Pad the bit vector up to a certain bit position */ |
| 63 | int bitvec_spare_padding(struct bitvec *bv, unsigned int up_to_bit); |
| 64 | |
| 65 | #endif /* _BITVEC_H */ |