public static void BuildChecksum(Storage storage, string filePath)
{
var header = GetHeader(storage, filePath);
var name = Path.GetFileName(filePath);
var checksum = new ChecksumInfo();
using (var stream = storage.FileReadStream(filePath + ".header"))
{
checksum.Add("header", Hash.Generate(HashTypes.Sha512, stream));
}
using (var stream = storage.FileReadStream(filePath + ".data"))
{
checksum.Add("data", Hash.Generate(HashTypes.Sha512, stream));
}
if (header.Flags.HasFlag(DiscStorageFlags.SortedDynamicIndex) || header.Flags.HasFlag(DiscStorageFlags.UnsortedDynamicIndex))
{
using (var stream = storage.FileReadStream(filePath + ".lookup"))
{
checksum.Add("lookup", Hash.Generate(HashTypes.Sha512, stream));
}
}
storage.WriteFileBytes(filePath + ".checksums", checksum.ToArray());
}
public static CheckDiscStorageResult CheckDiscStorage(Storage _storage, string path)
{
var checksumData = _storage.ReadFileBytes(path + ".checksums");
if (checksumData != null)
{
var checksum = new ChecksumInfo(checksumData);
var error = false;
using (var headerStream = _storage.FileReadStream(path + ".header"))
{
var valid = checksum.Valid("header", headerStream);
if (!valid)
{
error = true;
}
}
using (var headerStream = _storage.FileReadStream(path + ".data"))
{
var valid = checksum.Valid("data", headerStream);
if (!valid)
{
error = true;
}
}
if (checksum.Get("lookup") != null)
{
using (var headerStream = _storage.FileReadStream(path + ".lookup"))
{
var valid = checksum.Valid("lookup", headerStream);
if (!valid)
{
error = true;
}
}
}
if (error)
{
return(CheckDiscStorageResult.CheckumFailed);
}
}
else
{
var error = false;
var header = GetHeader(_storage, path);
if (header == null)
{
return(CheckDiscStorageResult.HeaderNotFound);
}
using (var storage = new DiscStorage(_storage, path, header.BlockSize, header.UserData.Length, header.Flags | DiscStorageFlags.Readonly))
{
for (var i = storage.StartIndex; i <= storage.EndIndex; i++)
{
if (!storage.BlockDataCrcValidRawIndex(i))
{
error = true;
break;
}
}
}
if (error)
{
return(CheckDiscStorageResult.DataCrcError);
}
return(CheckDiscStorageResult.MissingChecksum);
}
return(CheckDiscStorageResult.Ok);
}