void c4_FormatB::Define(int, const t4_byte **ptr_) {
d4_assert(_memos.GetSize() == 0);
if (ptr_ != 0) {
_data.PullLocation(*ptr_);
if (_data.ColSize() > 0)
_sizeCol.PullLocation(*ptr_);
_memoCol.PullLocation(*ptr_);
}
// everything below this point could be delayed until use
// in that case, watch out that column space use is properly tracked
InitOffsets(_sizeCol);
if (_memoCol.ColSize() > 0) {
c4_Bytes walk;
_memoCol.FetchBytes(0, _memoCol.ColSize(), walk, true);
const t4_byte *p = walk.Contents();
for (int row = 0; p < walk.Contents() + walk.Size(); ++row) {
row += c4_Column::PullValue(p);
d4_assert(row < _memos.GetSize());
c4_Column *mc = d4_new c4_Column(_data.Persist());
d4_assert(mc != 0);
_memos.SetAt(row, mc);
mc->PullLocation(p);
}
d4_assert(p == walk.Contents() + walk.Size());
}
}
c4_Column *c4_FormatB::GetNthMemoCol(int index_, bool alloc_) {
t4_i32 start;
c4_Column *col;
int n = ItemLenOffCol(index_, start, col);
if (col == &_data && alloc_) {
col = d4_new c4_Column(_data.Persist());
_memos.SetAt(index_, col);
if (n > 0)
if (_data.IsDirty()) {
c4_Bytes temp;
_data.FetchBytes(start, n, temp, true);
col->SetBuffer(n);
col->StoreBytes(0, temp);
} else
col->SetLocation(_data.Position() + start, n);
}
return col;
}
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();
}
void c4_FormatB::OldDefine(char type_, c4_Persist &pers_) {
int rows = Owner().NumRows();
c4_ColOfInts sizes(_data.Persist());
if (type_ == 'M') {
InitOffsets(sizes);
c4_ColOfInts szVec(_data.Persist());
pers_.FetchOldLocation(szVec);
szVec.SetRowCount(rows);
c4_ColOfInts posVec(_data.Persist());
pers_.FetchOldLocation(posVec);
posVec.SetRowCount(rows);
for (int r = 0; r < rows; ++r) {
t4_i32 sz = szVec.GetInt(r);
if (sz > 0) {
c4_Column *mc = d4_new c4_Column(_data.Persist());
d4_assert(mc != 0);
_memos.SetAt(r, mc);
mc->SetLocation(posVec.GetInt(r), sz);
}
}
} else {
pers_.FetchOldLocation(_data);
if (type_ == 'B') {
pers_.FetchOldLocation(sizes);
#if !q4_OLD_IS_ALWAYS_V2
// WARNING - HUGE HACK AHEAD - THIS IS NOT 100% FULLPROOF!
//
// The above is correct for MK versions 2.0 and up, but *NOT*
// for MK 1.8.6 datafiles, which store sizes first (OUCH!!!).
// This means that there is not a 100% safe way to auto-convert
// both 1.8.6 and 2.0 files - since there is no way to detect
// unambiguously which version a datafile is. All we can do,
// is to carefully check both vectors, and *hope* that only one
// of them is valid as sizes vector. This problem applies to
// the 'B' (bytes) property type only, and only pre 2.0 files.
//
// To build a version which *always* converts assuming 1.8.6,
// add flag "-Dq4_OLD_IS_PRE_V2" to the compiler command line.
// Conversely, "-Dq4_OLD_IS_ALWAYS_V2" forces 2.0 conversion.
if (rows > 0) {
t4_i32 s1 = sizes.ColSize();
t4_i32 s2 = _data.ColSize();
#if !q4_OLD_IS_PRE_V2
// if the size vector is clearly impossible, swap vectors
bool fix = c4_ColOfInts::CalcAccessWidth(rows, s1) < 0;
// if the other vector might be valid as well, check further
if (!fix && c4_ColOfInts::CalcAccessWidth(rows, s2) >= 0) {
sizes.SetRowCount(rows);
t4_i32 total = 0;
for (int i = 0; i < rows; ++i) {
t4_i32 w = sizes.GetInt(i);
if (w < 0 || total > s2) {
total = - 1;
break;
}
total += w;
}
// if the sizes don't add up, swap vectors
fix = total != s2;
}
if (fix)
#endif
{
t4_i32 p1 = sizes.Position();
t4_i32 p2 = _data.Position();
_data.SetLocation(p1, s1);
sizes.SetLocation(p2, s2);
}
}
#endif
InitOffsets(sizes);
} else {
d4_assert(type_ == 'S');
sizes.SetRowCount(rows);
t4_i32 pos = 0;
t4_i32 lastEnd = 0;
int k = 0;
c4_ColIter iter(_data, 0, _data.ColSize());
while (iter.Next()) {
const t4_byte *p = iter.BufLoad();
for (int j = 0; j < iter.BufLen(); ++j)
if (!p[j]) {
sizes.SetInt(k++, pos + j + 1-lastEnd);
lastEnd = pos + j + 1;
}
pos += iter.BufLen();
}
d4_assert(pos == _data.ColSize());
if (lastEnd < pos) {
// last entry had no zero byte
_data.InsertData(pos++, 1, true);
sizes.SetInt(k, pos - lastEnd);
}
InitOffsets(sizes);
// get rid of entries with just a null byte
for (int r = 0; r < rows; ++r)
if (c4_FormatB::ItemSize(r) == 1)
SetOne(r, c4_Bytes());
}
}
}