private unsafe void ValidateBlock(byte[] buffer)
{
long checksum1;
int checksum2;
fixed(byte *lpData = buffer)
{
Footer.ComputeChecksum((IntPtr)lpData, out checksum1, out checksum2, buffer.Length - 16);
long checksumInData1 = *(long *)(lpData + buffer.Length - 16);
int checksumInData2 = *(int *)(lpData + buffer.Length - 8);
if (checksum1 != checksumInData1 || checksum2 != checksumInData2)
{
throw new Exception("Checksum on header file is invalid");
}
if (lpData[buffer.Length - 32] != (byte)BlockType.FileAllocationTable)
{
throw new Exception("IoReadState.BlockTypeMismatch");
}
if (*(int *)(lpData + buffer.Length - 28) != 0)
{
throw new Exception("IoReadState.IndexNumberMissmatch");
}
if (*(int *)(lpData + buffer.Length - 24) != 0)
{
throw new Exception("IoReadState.FileIdNumberDidNotMatch");
}
}
}
public unsafe void Benchmark()
{
byte[] data = new byte[4096];
Random r = new Random(1);
r.NextBytes(data);
//Prime the run
Murmur3Orig mm3 = new Murmur3Orig();
for (int x = 0; x < 1000; x++)
{
mm3.ComputeHash(data);
fixed(byte *lp = data)
{
for (int x = 0; x < 1000; x++)
{
Murmur3.ComputeHash(lp, data.Length, out ulong value1, out ulong value2);
}
for (int x = 0; x < 1000; x++)
{
Footer.ComputeChecksum((IntPtr)lp, out long value3, out int value4, data.Length);
}
}
Stopwatch sw1 = new Stopwatch();
Stopwatch sw2 = new Stopwatch();
Stopwatch sw3 = new Stopwatch();
sw1.Start();
for (int x = 0; x < 10000; x++)
mm3.ComputeHash(data); }
sw1.Stop();
fixed(byte *lp = data)
{
sw2.Start();
for (int x = 0; x < 10000; x++)
{
Murmur3.ComputeHash(lp, data.Length, out ulong value1, out ulong value2);
}
sw2.Stop();
sw3.Start();
for (int x = 0; x < 10000; x++)
{
Footer.ComputeChecksum((IntPtr)lp, out long value3, out int value4, data.Length);
}
sw3.Stop();
}
System.Console.WriteLine("orig: " + (4096 * 10000 / sw1.Elapsed.TotalSeconds / 1024 / 1024).ToString("0 MB/S"));
System.Console.WriteLine("mine: " + (4096 * 10000 / sw2.Elapsed.TotalSeconds / 1024 / 1024).ToString("0 MB/S"));
System.Console.WriteLine("old: " + (4096 * 10000 / sw3.Elapsed.TotalSeconds / 1024 / 1024).ToString("0 MB/S"));
}
private unsafe void WriteFooterData(byte[] buffer)
{
fixed(byte *lpData = buffer)
{
long checksum1;
int checksum2;
lpData[buffer.Length - 32] = (byte)BlockType.FileAllocationTable;
*(int *)(lpData + buffer.Length - 28) = 0;
*(int *)(lpData + buffer.Length - 24) = 0;
*(int *)(lpData + buffer.Length - 20) = 0;
Footer.ComputeChecksum((IntPtr)lpData, out checksum1, out checksum2, buffer.Length - 16);
*(long *)(lpData + buffer.Length - 16) = checksum1;
*(int *)(lpData + buffer.Length - 8) = checksum2;
*(int *)(lpData + buffer.Length - 4) = 0;
}
}
private unsafe string TestFile(string fileName)
{
ShortTime lastReport = ShortTime.Now;
int errorBlocks = 0;
uint firstBlockWithError = uint.MaxValue;
try
{
using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
int blockSize = FileHeaderBlock.SearchForBlockSize(stream);
stream.Position = 0;
byte[] data = new byte[blockSize];
stream.ReadAll(data, 0, blockSize);
var header = FileHeaderBlock.Open(data);
fixed(byte *lp = data)
{
stream.Position = header.HeaderBlockCount * blockSize;
uint startingBlock = header.HeaderBlockCount;
if (m_shouldQuickScan)
{
uint blocksToScan = (uint)Math.Ceiling(m_mbToScan * 1024 * 1024 / blockSize);
if (blocksToScan < header.LastAllocatedBlock)
{
startingBlock = Math.Max(header.HeaderBlockCount, header.LastAllocatedBlock - blocksToScan);
}
}
for (uint x = startingBlock; x <= header.LastAllocatedBlock; x++)
{
long checksum1;
int checksum2;
stream.ReadAll(data, 0, blockSize);
Footer.ComputeChecksum((IntPtr)lp, out checksum1, out checksum2, blockSize - 16);
long checksumInData1 = *(long *)(lp + blockSize - 16);
int checksumInData2 = *(int *)(lp + blockSize - 8);
if (!(checksum1 == checksumInData1 && checksum2 == checksumInData2))
{
firstBlockWithError = Math.Min(firstBlockWithError, x);
errorBlocks++;
}
if (m_quit)
{
if (errorBlocks == 0)
{
return("Quit Early - No Errors Found");
}
return($"Quit Early - Blocks With Errors {errorBlocks} Starting At {firstBlockWithError}");
}
if (lastReport.ElapsedSeconds() > .25)
{
lastReport = ShortTime.Now;
lblProgress.Text = $"Completed {m_filesScanned} of {m_filesToScan} files. Current File: {(stream.Position / (double)stream.Length).ToString("0.0%")}";
Application.DoEvents();
}
}
}
}
if (errorBlocks == 0)
{
return("No Errors Found");
}
return($"Blocks With Errors {errorBlocks} Starting At {firstBlockWithError}");
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
return("Error");
}
}