/*
* 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.
*/
/*
* Copyright © 2007 Pierre Habouzit
*/
#include "lib-lib.h"
#define UPPER_32(x) (((x) + 31) & ~31)
#define LOWER_32(x) ((x) & ~31)
void bits_extend(bits_t *bits, int pos)
{
if (bits->size == 0) {
bits->start = LOWER_32(pos >> 3);
}
if (pos >> 3 > bits->start + bits->size) {
int newsize = UPPER_32((pos >> 3) - bits->start + 1);
p_realloc(&bits->bits, bits->size = newsize);
return;
}
if (pos >> 3 < bits->start) {
unsigned char *tmp = bits->bits;
int prepend = LOWER_32(bits->start - (pos >> 3));
bits->bits = p_new(unsigned char, bits->size + prepend);
memcpy(bits->bits + prepend, tmp, bits->size);
bits->size += prepend;
bits->start -= prepend;
p_delete(&tmp);
}
}