status_t
PartitionMapWriter::WriteExtendedHead(const LogicalPartition* logical,
const PrimaryPartition* primary, bool clearCode)
{
if (primary == NULL)
return B_BAD_VALUE;
partition_table partitionTable;
if (clearCode) {
partitionTable.clear_code_area();
} else {
status_t error = _ReadBlock(primary->Offset(), partitionTable);
if (error != B_OK)
return error;
}
partitionTable.signature = kPartitionTableSectorSignature;
partition_descriptor* descriptor;
if (logical == NULL) {
for (int32 i = 0; i < 4; i++) {
descriptor = &partitionTable.table[i];
memset(descriptor, 0, sizeof(partition_descriptor));
}
} else {
LogicalPartition partition;
partition.SetPartitionTableOffset(primary->Offset());
partition.SetBlockSize(logical->BlockSize());
partition.SetOffset(logical->Offset());
partition.SetSize(logical->Size());
partition.SetType(logical->Type());
// set the logicals partition table to the correct location
descriptor = &partitionTable.table[0];
partition.GetPartitionDescriptor(descriptor);
descriptor = &partitionTable.table[1];
LogicalPartition* next = logical->Next();
if (next != NULL)
next->GetPartitionDescriptor(descriptor, true);
else
memset(descriptor, 0, sizeof(partition_descriptor));
// last two descriptors are empty
for (int32 i = 2; i < 4; i++) {
descriptor = &partitionTable.table[i];
memset(descriptor, 0, sizeof(partition_descriptor));
}
}
status_t error = _WriteBlock(primary->Offset(), partitionTable);
if (error != B_OK)
return error;
return B_OK;
}
