public PersistentContainerSettings(int pageSize = 4096,
PersistentContainerFlags flags = 0,
PersistentContainerCompressType compressType = PersistentContainerCompressType.None)
{
Extenders.ValidatePageSize(pageSize);
PageSize = pageSize;
Flags = flags;
CompressType = compressType;
}
internal PagedContainerHeader(Stream stm, IEncryptorDecryptor encryptorDecryptor)
{
if (stm.Length < HEADER_PART)
{
throw new InvalidDataException("PagedContainerHeader: File corrupted (too small)");
}
stm.Position = 0;
var buff = new byte[HEADER_PART];
stm.Read(buff, 0, buff.Length);
int offset = 0;
var sign = buff.GetInt(ref offset); // 4 byte
if (sign != SIGN)
{
throw new InvalidDataException($"PagedContainerHeader: File corruped (signature {sign:X}h invalid, must be {SIGN:X}h)");
}
PageSize = buff.GetInt(ref offset); // 4 byte
PageUserDataSize = PageSize - 4;
Extenders.ValidatePageSize(PageSize);
DirectoryFirstPage = buff.GetInt(ref offset); // 4 byte
if (DirectoryFirstPage < 0)
{
throw new InvalidDataException($"PagedContainerHeader: DirectoryFirstPage has invalid value ({DirectoryFirstPage})");
}
Flags = (PersistentContainerFlags)(buff.GetUInt16(ref offset) & 0xFFFF);
var flagsData = buff[offset];
CompressType = (PersistentContainerCompressType)flagsData;
DataHandler = getDataHandler(CompressType, encryptorDecryptor);
}