private unsafe static bool VerifyBlockChecksum(byte *ptr, int length)
{
var cs = Utility.XorBytes(ptr + 8, length + HeaderSize - 8);
if (cs != GetHeader((long)ptr).Checksum)
{
return(false);
}
return(true);
}
/// <summary>
/// Write info to byte array
/// </summary>
public readonly byte[] ToByteArray()
{
using MemoryStream ms = new();
using (BinaryWriter writer = new(ms))
{
writer.Write(FasterLogRecoveryVersion); // version
int iteratorCount = 0;
if (Iterators != null)
{
iteratorCount = Iterators.Count;
}
int cookieLength = -1;
long cookieChecksum = 0;
if (Cookie != null)
{
cookieLength = Cookie.Length;
if (cookieLength > 0)
{
unsafe
{
fixed(byte *ptr = Cookie)
cookieChecksum = (long)Utility.XorBytes(ptr, cookieLength);
}
}
}
writer.Write(BeginAddress ^ UntilAddress ^ CommitNum ^ iteratorCount ^ cookieLength ^ cookieChecksum); // checksum
writer.Write(BeginAddress);
writer.Write(UntilAddress);
writer.Write(CommitNum);
writer.Write(iteratorCount);
if (iteratorCount > 0)
{
foreach (var kvp in Iterators)
{
writer.Write(kvp.Key);
writer.Write(kvp.Value);
}
}
writer.Write(cookieLength);
if (cookieLength > 0)
{
writer.Write(Cookie);
}
}
return(ms.ToArray());
}
/// <summary>
/// Initialize from stream
/// </summary>
/// <param name="reader"></param>
public void Initialize(BinaryReader reader)
{
int version;
long checkSum;
try
{
version = reader.ReadInt32();
checkSum = reader.ReadInt64();
BeginAddress = reader.ReadInt64();
UntilAddress = reader.ReadInt64();
if (version > 0)
{
CommitNum = reader.ReadInt64();
}
else
{
CommitNum = -1;
}
}
catch (Exception e)
{
throw new FasterException("Unable to recover from previous commit. Inner exception: " + e.ToString());
}
if (version < 0 || version > FasterLogRecoveryVersion)
{
throw new FasterException("Invalid version found during commit recovery");
}
var iteratorCount = 0;
try
{
iteratorCount = reader.ReadInt32();
}
catch { }
if (iteratorCount > 0)
{
Iterators = new Dictionary <string, long>();
for (int i = 0; i < iteratorCount; i++)
{
Iterators.Add(reader.ReadString(), reader.ReadInt64());
}
}
int cookieLength = -1;
long cookieChecksum = 0;
if (version >= FasterLogRecoveryVersion)
{
try
{
cookieLength = reader.ReadInt32();
}
catch { }
if (cookieLength >= 0)
{
Cookie = reader.ReadBytes(cookieLength);
unsafe
{
fixed(byte *ptr = Cookie)
cookieChecksum = (long)Utility.XorBytes(ptr, cookieLength);
}
}
}
long computedChecksum = BeginAddress ^ UntilAddress;
if (version >= FasterLogRecoveryVersion)
{
computedChecksum ^= CommitNum ^ iteratorCount ^ cookieLength ^ cookieChecksum;
}
// Handle case where all fields are zero
if (version == 0 && BeginAddress == 0 && UntilAddress == 0 && iteratorCount == 0)
{
throw new FasterException("Invalid checksum found during commit recovery");
}
if (checkSum != computedChecksum)
{
throw new FasterException("Invalid checksum found during commit recovery");
}
}