2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or (at
5 * your option) any later version.
7 * This program is distributed in the hope that it will be useful, but
8 * WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
18 * Copyright © 2007 Pierre Habouzit
23 #define UPPER_32(x) (((x) + 31) & ~31)
24 #define LOWER_32(x) ((x) & ~31)
26 void bits_extend(bits_t *bits, int pos)
28 if (bits->size == 0) {
29 bits->start = LOWER_32(pos >> 3);
32 if (pos >> 3 > bits->start + bits->size) {
33 int newsize = UPPER_32((pos >> 3) - bits->start + 1);
34 p_realloc(&bits->bits, bits->size = newsize);
38 if (pos >> 3 < bits->start) {
39 unsigned char *tmp = bits->bits;
40 int prepend = LOWER_32(bits->start - (pos >> 3));
42 bits->bits = p_new(unsigned char, bits->size + prepend);
43 memcpy(bits->bits + prepend, tmp, bits->size);
44 bits->size += prepend;
45 bits->start -= prepend;