private uint CalculateChecksum()
{
Footer copy = new Footer(this);
copy.Checksum = 0;
byte[] asBytes = new byte[512];
copy.ToBytes(asBytes, 0);
uint checksum = 0;
foreach (uint value in asBytes)
{
checksum += value;
}
checksum = ~checksum;
return checksum;
}
public Footer(Footer toCopy)
{
Cookie = toCopy.Cookie;
Features = toCopy.Features;
FileFormatVersion = toCopy.FileFormatVersion;
DataOffset = toCopy.DataOffset;
Timestamp = toCopy.Timestamp;
CreatorApp = toCopy.CreatorApp;
CreatorVersion = toCopy.CreatorVersion;
CreatorHostOS = toCopy.CreatorHostOS;
OriginalSize = toCopy.OriginalSize;
CurrentSize = toCopy.CurrentSize;
Geometry = toCopy.Geometry;
DiskType = toCopy.DiskType;
Checksum = toCopy.Checksum;
UniqueId = toCopy.UniqueId;
SavedState = toCopy.SavedState;
}
public static Footer FromBytes(byte[] buffer, int offset)
{
Footer result = new Footer();
result.Cookie = Utilities.BytesToString(buffer, offset + 0, 8);
result.Features = Utilities.ToUInt32BigEndian(buffer, offset + 8);
result.FileFormatVersion = Utilities.ToUInt32BigEndian(buffer, offset + 12);
result.DataOffset = Utilities.ToInt64BigEndian(buffer, offset + 16);
result.Timestamp = EpochUtc.AddSeconds(Utilities.ToUInt32BigEndian(buffer, offset + 24));
result.CreatorApp = Utilities.BytesToString(buffer, offset + 28, 4);
result.CreatorVersion = Utilities.ToUInt32BigEndian(buffer, offset + 32);
result.CreatorHostOS = Utilities.BytesToString(buffer, offset + 36, 4);
result.OriginalSize = Utilities.ToInt64BigEndian(buffer, offset + 40);
result.CurrentSize = Utilities.ToInt64BigEndian(buffer, offset + 48);
result.Geometry = new Geometry(Utilities.ToUInt16BigEndian(buffer, offset + 56), buffer[58], buffer[59]);
result.DiskType = (FileType)Utilities.ToUInt32BigEndian(buffer, offset + 60);
result.Checksum = Utilities.ToUInt32BigEndian(buffer, offset + 64);
result.UniqueId = Utilities.ToGuidBigEndian(buffer, offset + 68);
result.SavedState = buffer[84];
return result;
}
