public static MasterRecord CreateNewVolume([NotNull] IDirectDiskAccess access, ulong size)
{
Validate.ArgumentNotNull(access, "access");
if (size % Constants.BlockSizeBytes != 0)
{
throw new ArgumentOutOfRangeException("Volume size should be on block size boundary.");
}
if (size <= BlockGroup.ReservedBlocks * Constants.BlockSizeBytes)
{
throw new ArgumentOutOfRangeException(string.Format("Min volume size is {0}", Constants.BlockSizeBytes * (BlockGroup.ReservedBlocks + 1)));
}
var totalBlocks = (uint)(size / Constants.BlockSizeBytes);
uint numberOfFullGroups = totalBlocks / Constants.BlocksPerGroup;
uint remainingBlocks = totalBlocks % Constants.BlocksPerGroup;
if (remainingBlocks > BlockGroup.ReservedBlocks)
{
numberOfFullGroups++;
}
var rec = new MasterRecord(access);
rec._groupsReserved = new BlockGroup[numberOfFullGroups];
var offset = new Address(32 + (BlockGroupDescriptor.RawSizeBytes * numberOfFullGroups));
offset = offset.AlignOnBlockBoundary;
uint totalFreeBlocks = 0;
for (uint i = 0; i < numberOfFullGroups; ++i)
{
bool last = (i == numberOfFullGroups - 1 && remainingBlocks > 0);
var groupSize = last ? remainingBlocks : Constants.BlocksPerGroup;
var newGroup = new BlockGroup(offset, groupSize);
offset = offset.AddBlocks(groupSize);
totalFreeBlocks += newGroup.Descriptor.NumFreeBlocksInGroup;
rec._groupsReserved[i] = newGroup;
}
rec._freeSpaceBlocks = totalFreeBlocks;
rec.VolumeSize = offset.Value;
rec.RootNode = rec.CreateDirectoryNode("\\", null);
return rec;
}