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| author | Taylor Blau <me@ttaylorr.com> | 2024-05-23 17:26:49 -0400 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2024-05-24 11:40:42 -0700 |
| commit | 79621f3e4151dfe8ef8fdb2800c59dc65f4867e6 (patch) | |
| tree | 0c6158909e11f21f57c2cb17b2b606b07f847009 /pack-bitmap.c | |
| parent | 53ea3ec47990e9ad00a238fd962f36e5d87a6386 (diff) | |
| download | git-79621f3e4151dfe8ef8fdb2800c59dc65f4867e6.tar.xz | |
pack-bitmap: extract `read_bitmap()` function
The pack-bitmap machinery uses the `read_bitmap_1()` function to read a
bitmap from within the mmap'd region corresponding to the .bitmap file.
As as side-effect of calling this function, `read_bitmap_1()` increments
the `index->map_pos` variable to reflect the number of bytes read.
Extract the core of this routine to a separate function (that operates
over a `const unsigned char *`, a `size_t` and a `size_t *` pointer)
instead of a `struct bitmap_index *` pointer.
This function (called `read_bitmap()`) is part of the pack-bitmap.h API
so that it can be used within the upcoming portion of the implementation
in pseduo-merge.ch.
Rewrite the existing function, `read_bitmap_1()`, in terms of its more
generic counterpart.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'pack-bitmap.c')
| -rw-r--r-- | pack-bitmap.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/pack-bitmap.c b/pack-bitmap.c index 35c5ef9d3c..3519edb896 100644 --- a/pack-bitmap.c +++ b/pack-bitmap.c @@ -129,17 +129,13 @@ static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st) return composed; } -/* - * Read a bitmap from the current read position on the mmaped - * index, and increase the read position accordingly - */ -static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) +struct ewah_bitmap *read_bitmap(const unsigned char *map, + size_t map_size, size_t *map_pos) { struct ewah_bitmap *b = ewah_pool_new(); - ssize_t bitmap_size = ewah_read_mmap(b, - index->map + index->map_pos, - index->map_size - index->map_pos); + ssize_t bitmap_size = ewah_read_mmap(b, map + *map_pos, + map_size - *map_pos); if (bitmap_size < 0) { error(_("failed to load bitmap index (corrupted?)")); @@ -147,10 +143,20 @@ static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) return NULL; } - index->map_pos += bitmap_size; + *map_pos += bitmap_size; + return b; } +/* + * Read a bitmap from the current read position on the mmaped + * index, and increase the read position accordingly + */ +static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) +{ + return read_bitmap(index->map, index->map_size, &index->map_pos); +} + static uint32_t bitmap_num_objects(struct bitmap_index *index) { if (index->midx) |