diff options
Diffstat (limited to 'ewah')
| -rw-r--r-- | ewah/bitmap.c | 21 | ||||
| -rw-r--r-- | ewah/ewok.h | 2 |
2 files changed, 19 insertions, 4 deletions
diff --git a/ewah/bitmap.c b/ewah/bitmap.c index 52f1178db4ce..d8cec585af97 100644 --- a/ewah/bitmap.c +++ b/ewah/bitmap.c @@ -22,21 +22,26 @@ #define EWAH_MASK(x) ((eword_t)1 << (x % BITS_IN_EWORD)) #define EWAH_BLOCK(x) (x / BITS_IN_EWORD) -struct bitmap *bitmap_new(void) +struct bitmap *bitmap_word_alloc(size_t word_alloc) { struct bitmap *bitmap = xmalloc(sizeof(struct bitmap)); - bitmap->words = xcalloc(32, sizeof(eword_t)); - bitmap->word_alloc = 32; + bitmap->words = xcalloc(word_alloc, sizeof(eword_t)); + bitmap->word_alloc = word_alloc; return bitmap; } +struct bitmap *bitmap_new(void) +{ + return bitmap_word_alloc(32); +} + void bitmap_set(struct bitmap *self, size_t pos) { size_t block = EWAH_BLOCK(pos); if (block >= self->word_alloc) { size_t old_size = self->word_alloc; - self->word_alloc = block * 2; + self->word_alloc = block ? block * 2 : 1; REALLOC_ARRAY(self->words, self->word_alloc); memset(self->words + old_size, 0x0, (self->word_alloc - old_size) * sizeof(eword_t)); @@ -45,6 +50,14 @@ 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); diff --git a/ewah/ewok.h b/ewah/ewok.h index 84b2a29faa0c..011852bef179 100644 --- a/ewah/ewok.h +++ b/ewah/ewok.h @@ -172,7 +172,9 @@ struct bitmap { }; struct bitmap *bitmap_new(void); +struct bitmap *bitmap_word_alloc(size_t word_alloc); 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); |