// _ParseExtended
status_t
PartitionMapParser::_ParseExtended(PrimaryPartition* primary, off_t offset)
{
status_t error = B_OK;
int32 partitionCount = 0;
while (error == B_OK) {
// check for cycles
if (++partitionCount > kMaxLogicalPartitionCount) {
TRACE(("intel: _ParseExtended(): Maximal number of logical "
"partitions for extended partition reached. Cycle?\n"));
error = B_BAD_DATA;
}
// read the partition table
if (error == B_OK)
error = _ReadPartitionTable(offset);
// check the signature
if (error == B_OK
&& fPartitionTable->signature != kPartitionTableSectorSignature) {
TRACE(("intel: _ParseExtended(): invalid partition table signature: "
"%lx\n", (uint32)fPartitionTable->signature));
error = B_BAD_DATA;
}
// ignore the partition table, if any error occured till now
if (error != B_OK) {
TRACE(("intel: _ParseExtended(): ignoring this partition table\n"));
error = B_OK;
break;
}
// Examine the table, there is exactly one extended and one
// non-extended logical partition. All four table entries are
// examined though. If there is no inner extended partition,
// the end of the linked list is reached.
// The first partition table describing both an "inner extended" parition
// and a "data" partition (non extended and not empty) is the start
// sector of the primary extended partition. The next partition table in
// the linked list is the start sector of the inner extended partition
// described in this partition table.
LogicalPartition extended;
LogicalPartition nonExtended;
for (int32 i = 0; error == B_OK && i < 4; i++) {
const partition_descriptor* descriptor = &fPartitionTable->table[i];
if (descriptor->is_empty())
continue;
LogicalPartition* partition = NULL;
if (descriptor->is_extended()) {
if (extended.IsEmpty()) {
extended.SetTo(descriptor, offset, primary);
partition = &extended;
} else {
// only one extended partition allowed
error = B_BAD_DATA;
TRACE(("intel: _ParseExtended(): "
"only one extended partition allowed\n"));
}
} else {
if (nonExtended.IsEmpty()) {
nonExtended.SetTo(descriptor, offset, primary);
partition = &nonExtended;
} else {
// only one non-extended partition allowed
error = B_BAD_DATA;
TRACE(("intel: _ParseExtended(): only one "
"non-extended partition allowed\n"));
}
}
if (partition == NULL)
break;
// work-around potential BIOS/OS problems
partition->FitSizeToSession(fSessionSize);
// check the partition's location
if (!partition->CheckLocation(fSessionSize)) {
error = B_BAD_DATA;
TRACE(("intel: _ParseExtended(): Invalid partition "
"location: pts: %lld, offset: %lld, size: %lld\n",
partition->PartitionTableOffset(), partition->Offset(),
partition->Size()));
}
}
// add non-extended partition to list
if (error == B_OK && !nonExtended.IsEmpty()) {
LogicalPartition* partition
= new(nothrow) LogicalPartition(nonExtended);
if (partition)
primary->AddLogicalPartition(partition);
else
error = B_NO_MEMORY;
}
// prepare to parse next extended/non-extended partition pair
if (error == B_OK && !extended.IsEmpty())
offset = extended.Offset();
else
break;
}
return error;
}
