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bitmap: add bitmap_unset() function

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We've never needed to unset an individual bit in a bitmap until now.
Typically they start with all bits unset and we bitmap_set() them, or we
are applying another bitmap as a mask. But the easiest way to apply an
object filter to a bitmap result will be to unset the individual bits.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-02-14 13:22:34 -05:00 committed by Junio C Hamano
parent 2aaeb9ac41
commit cc4aa28506
2 changed files with 9 additions and 0 deletions
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8
ewah/bitmap.c
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@ -45,6 +45,14 @@ void bitmap_set(struct bitmap *self, size_t pos)
self->words[block] |= EWAH_MASK(pos);
}
void bitmap_unset(struct bitmap *self, size_t pos)
{
size_t block = EWAH_BLOCK(pos);
if (block < self->word_alloc)
self->words[block] &= ~EWAH_MASK(pos);
}
int bitmap_get(struct bitmap *self, size_t pos)
{
size_t block = EWAH_BLOCK(pos);

1
ewah/ewok.h
View File

@ -173,6 +173,7 @@ struct bitmap {
struct bitmap *bitmap_new(void);
void bitmap_set(struct bitmap *self, size_t pos);
void bitmap_unset(struct bitmap *self, size_t pos);
int bitmap_get(struct bitmap *self, size_t pos);
void bitmap_reset(struct bitmap *self);
void bitmap_free(struct bitmap *self);