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pack-bitmap: extract read_bitmap() function

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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>
This commit is contained in:
Taylor Blau 2024-05-23 17:26:49 -04:00 committed by Junio C Hamano
parent 53ea3ec479
commit 79621f3e41
2 changed files with 17 additions and 9 deletions
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24
pack-bitmap.c
View File

@ -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)

2
pack-bitmap.h
View File

@ -160,4 +160,6 @@ int bitmap_is_preferred_refname(struct repository *r, const char *refname);
int verify_bitmap_files(struct repository *r);
struct ewah_bitmap *read_bitmap(const unsigned char *map,
size_t map_size, size_t *map_pos);
#endif