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bitmap: Add bitmap_copy_with_{src|dst}_offset()

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These helpers copy the source bitmap to destination bitmap with a
shift either on the src or dst bitmap.

Meanwhile, we never have bitmap tests but we should.

This patch also introduces the initial test cases for utils/bitmap.c
but it only tests the newly introduced functions.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20190603065056.25211-5-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

---

Bitmap test used sizeof(unsigned long) instead of BITS_PER_LONG.
This commit is contained in:
Peter Xu 2019-06-03 14:50:49 +08:00 • committed by Juan Quintela
parent ae7a2bca8a
commit ad37f24d57
4 changed files with 168 additions and 0 deletions
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9
include/qemu/bitmap.h
View file

@ -41,6 +41,10 @@
* bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area
* bitmap_to_le(dst, src, nbits) Convert bitmap to little endian
* bitmap_from_le(dst, src, nbits) Convert bitmap from little endian
* bitmap_copy_with_src_offset(dst, src, offset, nbits)
* *dst = *src (with an offset into src)
* bitmap_copy_with_dst_offset(dst, src, offset, nbits)
* *dst = *src (with an offset into dst)
*/
/*
@ -271,4 +275,9 @@ void bitmap_to_le(unsigned long *dst, const unsigned long *src,
void bitmap_from_le(unsigned long *dst, const unsigned long *src,
long nbits);
void bitmap_copy_with_src_offset(unsigned long *dst, const unsigned long *src,
unsigned long offset, unsigned long nbits);
void bitmap_copy_with_dst_offset(unsigned long *dst, const unsigned long *src,
unsigned long shift, unsigned long nbits);
#endif /* BITMAP_H */