void c4_FormatB::Remove(int index_, int count_) {
_recalc = true;
t4_i32 off = Offset(index_);
t4_i32 n = Offset(index_ + count_) - off;
d4_assert(n >= 0);
// remove the columns, if present
for (int i = 0; i < count_; ++i)
delete (c4_Column*)_memos.GetAt(index_ + i);
_memos.RemoveAt(index_, count_);
if (n > 0)
_data.Shrink(off, n);
_offsets.RemoveAt(index_, count_);
d4_assert(index_ < _offsets.GetSize());
// adjust all following entries
while (index_ < _offsets.GetSize())
_offsets.ElementAt(index_++) -= n;
d4_assert((t4_i32)_offsets.GetAt(index_ - 1) == _data.ColSize());
d4_assert(index_ <= _memos.GetSize() + 1);
}
void c4_FormatB::Unmapped() {
_data.ReleaseAllSegments();
_sizeCol.ReleaseAllSegments();
_memoCol.ReleaseAllSegments();
for (int i = 0; i < _memos.GetSize(); ++i) {
c4_Column *cp = (c4_Column*)_memos.GetAt(i);
if (cp != 0)
cp->ReleaseAllSegments();
}
}
int c4_FormatB::ItemLenOffCol(int index_, t4_i32 &off_, c4_Column * &col_) {
col_ = (c4_Column*)_memos.GetAt(index_);
if (col_ != 0) {
off_ = 0;
return col_->ColSize();
}
col_ = &_data;
off_ = Offset(index_);
return Offset(index_ + 1) - off_;
}
void c4_FormatB::SetOne(int index_, const c4_Bytes &xbuf_, bool ignoreMemos_) {
// this fixes bug in 2.4.0 when copying string from higher row
// TODO: this fix is very conservative, figure out when to copy
// (can probably look at pointer to see whether it's from us)
int sz = xbuf_.Size();
c4_Bytes buf_(xbuf_.Contents(), sz, 0 < sz && sz <= c4_Column::kSegMax);
c4_Column *cp = &_data;
t4_i32 start = Offset(index_);
int len = Offset(index_ + 1) - start;
if (!ignoreMemos_ && _memos.GetAt(index_) != 0)
len = ItemLenOffCol(index_, start, cp);
int m = buf_.Size();
int n = m - len;
if (n > 0)
cp->Grow(start, n);
else if (n < 0)
cp->Shrink(start, - n);
else if (m == 0)
return ;
// no size change and no contents
_recalc = true;
cp->StoreBytes(start, buf_);
if (n && cp == &_data) {
// if size has changed
int k = _offsets.GetSize() - 1;
// if filling in an empty entry at end: extend offsets first
if (m > 0 && index_ >= k) {
_offsets.InsertAt(k, _offsets.GetAt(k), index_ - k + 1);
k = index_ + 1;
d4_assert(k == _offsets.GetSize() - 1);
}
// adjust following entry offsets
while (++index_ <= k)
_offsets.ElementAt(index_) += n;
}
d4_assert((t4_i32)_offsets.GetAt(_offsets.GetSize() - 1) == _data.ColSize());
}
void c4_FormatB::Commit(c4_SaveContext &ar_) {
int rows = _memos.GetSize();
d4_assert(rows > 0);
bool full = _recalc || ar_.Serializing();
if (!full)
for (int i = 0; i < rows; ++i) {
c4_Column *col = (c4_Column*)_memos.GetAt(i);
if (col != 0) {
full = true;
break;
}
}
d4_assert(_recalc || _sizeCol.RowCount() == rows);
if (full) {
_memoCol.SetBuffer(0);
_sizeCol.SetBuffer(0);
_sizeCol.SetAccessWidth(0);
_sizeCol.SetRowCount(rows);
int skip = 0;
c4_Column *saved = ar_.SetWalkBuffer(&_memoCol);
for (int r = 0; r < rows; ++r) {
++skip;
t4_i32 start;
c4_Column *col;
int len = ItemLenOffCol(r, start, col);
bool oldMemo = col != &_data;
bool newMemo = ShouldBeMemo(len);
if (!oldMemo && newMemo) {
col = GetNthMemoCol(r, true);
d4_assert(col != &_data);
//? start = 0;
}
c4_Bytes temp;
if (newMemo) {
// it now is a memo, inlined data will be empty
ar_.StoreValue(skip - 1);
skip = 0;
ar_.CommitColumn(*col);
} else if (!oldMemo) {
// it was no memo, done if it hasn't become one
_sizeCol.SetInt(r, len);
continue;
} else {
// it was a memo, but it no longer is
d4_assert(start == 0);
if (len > 0) {
_sizeCol.SetInt(r, len);
col->FetchBytes(start, len, temp, true);
delete (c4_Column*)_memos.GetAt(r); // 28-11-2001: fix mem leak
_memos.SetAt(r, 0); // 02-11-2001: fix for use after commit
}
}
SetOne(r, temp, true); // bypass current memo pointer
}
ar_.SetWalkBuffer(saved);
}
ar_.CommitColumn(_data);
if (_data.ColSize() > 0) {
_sizeCol.FixSize(true);
ar_.CommitColumn(_sizeCol);
//_sizeCol.FixSize(false);
}
ar_.CommitColumn(_memoCol);
// need a way to find out when the data has been committed (on 2nd pass)
// both _sizeCol and _memoCol will be clean again when it has
// but be careful because dirty flag is only useful if size is nonzero
if (_recalc && !ar_.Serializing())
_recalc = _sizeCol.ColSize() > 0 && _sizeCol.IsDirty() || _memoCol.ColSize()
> 0 && _memoCol.IsDirty();
}