public int Read(FileVersion version, byte[] buffer, int offset)
{
if (version.Major == 0)
{
ImageType = (ImageType)Utilities.ToUInt32LittleEndian(buffer, offset + 0);
Flags = (ImageFlags)Utilities.ToUInt32LittleEndian(buffer, offset + 4);
Comment = Utilities.BytesToString(buffer, offset + 8, 256).TrimEnd(new char[] { '\0' });
LegacyGeometry = new GeometryRecord();
LegacyGeometry.Read(buffer, offset + 264);
DiskSize = Utilities.ToInt64LittleEndian(buffer, offset + 280);
BlockSize = Utilities.ToInt32LittleEndian(buffer, offset + 288);
BlockCount = Utilities.ToInt32LittleEndian(buffer, offset + 292);
BlocksAllocated = Utilities.ToInt32LittleEndian(buffer, offset + 296);
UniqueId = Utilities.ToGuidLittleEndian(buffer, offset + 300);
ModificationId = Utilities.ToGuidLittleEndian(buffer, offset + 316);
ParentId = Utilities.ToGuidLittleEndian(buffer, offset + 332);
HeaderSize = 348;
BlocksOffset = HeaderSize + PreHeaderRecord.Size;
DataOffset = (uint)(BlocksOffset + (BlockCount * 4));
BlockExtraSize = 0;
ParentModificationId = Guid.Empty;
}
else if (version.Major == 1 && version.Minor == 1)
{
HeaderSize = Utilities.ToUInt32LittleEndian(buffer, offset + 0);
ImageType = (ImageType)Utilities.ToUInt32LittleEndian(buffer, offset + 4);
Flags = (ImageFlags)Utilities.ToUInt32LittleEndian(buffer, offset + 8);
Comment = Utilities.BytesToString(buffer, offset + 12, 256).TrimEnd(new char[] { '\0' });
BlocksOffset = Utilities.ToUInt32LittleEndian(buffer, offset + 268);
DataOffset = Utilities.ToUInt32LittleEndian(buffer, offset + 272);
LegacyGeometry = new GeometryRecord();
LegacyGeometry.Read(buffer, offset + 276);
DiskSize = Utilities.ToInt64LittleEndian(buffer, offset + 296);
BlockSize = Utilities.ToInt32LittleEndian(buffer, offset + 304);
BlockExtraSize = Utilities.ToInt32LittleEndian(buffer, offset + 308);
BlockCount = Utilities.ToInt32LittleEndian(buffer, offset + 312);
BlocksAllocated = Utilities.ToInt32LittleEndian(buffer, offset + 316);
UniqueId = Utilities.ToGuidLittleEndian(buffer, offset + 320);
ModificationId = Utilities.ToGuidLittleEndian(buffer, offset + 336);
ParentId = Utilities.ToGuidLittleEndian(buffer, offset + 352);
ParentModificationId = Utilities.ToGuidLittleEndian(buffer, offset + 368);
if (HeaderSize > 384)
{
LChsGeometry = new GeometryRecord();
LChsGeometry.Read(buffer, offset + 384);
}
}
else
{
throw new IOException("Unrecognized file version: " + version);
}
return((int)HeaderSize);
}
internal static VirtualDiskTypeInfo MakeDiskTypeInfo(string variant)
{
return(new VirtualDiskTypeInfo()
{
Name = "VDI",
Variant = variant,
CanBeHardDisk = true,
DeterministicGeometry = true,
PreservesBiosGeometry = true,
CalcGeometry = c => GeometryRecord.FromCapacity(c).ToGeometry(c),
});
}
public static GeometryRecord FromCapacity(long capacity)
{
GeometryRecord result = new GeometryRecord();
long totalSectors = capacity / 512;
if (totalSectors / (16 * 63) <= 1024)
{
result.Cylinders = (int)Math.Max(totalSectors / (16 * 63), 1);
result.Heads = 16;
}
else if (totalSectors / (32 * 63) <= 1024)
{
result.Cylinders = (int)Math.Max(totalSectors / (32 * 63), 1);
result.Heads = 32;
}
else if (totalSectors / (64 * 63) <= 1024)
{
result.Cylinders = (int)(totalSectors / (64 * 63));
result.Heads = 64;
}
else if (totalSectors / (128 * 63) <= 1024)
{
result.Cylinders = (int)(totalSectors / (128 * 63));
result.Heads = 128;
}
else
{
result.Cylinders = (int)Math.Min(totalSectors / (255 * 63), 1024);
result.Heads = 255;
}
result.Sectors = 63;
return(result);
}