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types: add shrink_begin and shrink_end methods for BeesFileRange and BeesRangePair

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These allow trimming of overlapping dedupes.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2024-11-18 23:57:29 -05:00
parent 05bf1ebf76
commit 97eab9655c
2 changed files with 41 additions and 0 deletions
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34
src/bees-types.cc
View File

@ -183,6 +183,24 @@ BeesFileRange::grow_begin(off_t delta)
return m_begin;
}
off_t
BeesFileRange::shrink_begin(off_t delta)
{
THROW_CHECK1(invalid_argument, delta, delta > 0);
THROW_CHECK3(invalid_argument, delta, m_begin, m_end, delta + m_begin < m_end);
m_begin += delta;
return m_begin;
}
off_t
BeesFileRange::shrink_end(off_t delta)
{
THROW_CHECK1(invalid_argument, delta, delta > 0);
THROW_CHECK2(invalid_argument, delta, m_end, m_end >= delta);
m_end -= delta;
return m_end;
}
BeesFileRange::BeesFileRange(const BeesBlockData &bbd) :
m_fd(bbd.fd()),
m_begin(bbd.begin()),
@ -589,6 +607,22 @@ BeesRangePair::copy_closed() const
return BeesRangePair(first.copy_closed(), second.copy_closed());
}
void
BeesRangePair::shrink_begin(off_t const delta)
{
first.shrink_begin(delta);
second.shrink_begin(delta);
THROW_CHECK2(runtime_error, first.size(), second.size(), first.size() == second.size());
}
void
BeesRangePair::shrink_end(off_t const delta)
{
first.shrink_end(delta);
second.shrink_end(delta);
THROW_CHECK2(runtime_error, first.size(), second.size(), first.size() == second.size());
}
ostream &
operator<<(ostream &os, const BeesAddress &ba)
{

7
src/bees.h
View File

@ -300,6 +300,11 @@ public:
off_t grow_begin(off_t delta);
/// @}
/// @{ Make range smaller
off_t shrink_end(off_t delta);
off_t shrink_begin(off_t delta);
/// @}
friend ostream & operator<<(ostream &os, const BeesFileRange &bfr);
};
@ -665,6 +670,8 @@ class BeesRangePair : public pair<BeesFileRange, BeesFileRange> {
public:
BeesRangePair(const BeesFileRange &src, const BeesFileRange &dst);
bool grow(shared_ptr<BeesContext> ctx, bool constrained);
void shrink_begin(const off_t delta);
void shrink_end(const off_t delta);
BeesRangePair copy_closed() const;
bool operator<(const BeesRangePair &that) const;
friend ostream & operator<<(ostream &os, const BeesRangePair &brp);