77 lines
3.0 KiB
C
77 lines
3.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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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; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/log/check.h"
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#include "libc/macros.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "tool/decode/lib/bitabuilder.h"
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/**
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* @fileoverview Sparse bit array builder.
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*/
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struct BitaBuilder {
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size_t i, n;
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unsigned *p;
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};
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struct BitaBuilder *bitabuilder_new(void) {
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return calloc(1, sizeof(struct BitaBuilder));
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}
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void bitabuilder_free(struct BitaBuilder **bbpp) {
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if (*bbpp) {
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free_s(&(*bbpp)->p);
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free_s(bbpp);
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}
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}
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/**
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* Sets bit.
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*
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* @return false if out of memory
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*/
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bool bitabuilder_setbit(struct BitaBuilder *bb, size_t bit) {
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void *p2;
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size_t i, n;
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i = MAX(bb->i, ROUNDUP(bit / CHAR_BIT + 1, __BIGGEST_ALIGNMENT__));
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if (i > bb->n) {
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n = i + (i >> 2);
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if ((p2 = realloc(bb->p, n))) {
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memset((char *)p2 + bb->n, 0, n - bb->n);
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bb->n = n;
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bb->p = p2;
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} else {
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return false;
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}
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}
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bb->i = i;
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bts(bb->p, bit);
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return true;
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}
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bool bitabuilder_fwrite(const struct BitaBuilder *bb, FILE *f) {
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return fwrite(bb->p, bb->i, 1, f);
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}
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