public void VerifyFileHash()
{
var sw = Stopwatch.StartNew();
Log.Trace("Verifying file hash of PTable '{0}' started...", Path.GetFileName(Filename));
#if __MonoCS__
var workItem = GetWorkItem();
var stream = workItem.Stream;
try {
#else
using (var stream = UnbufferedFileReadStream.Open(_filename))
{
#endif
//stream.Position = 0;
var hash = MD5Hash.GetHashFor(stream, 0, stream.Length - MD5Size);
var fileHash = new byte[MD5Size];
stream.Read(fileHash, 0, MD5Size);
if (hash == null)
{
throw new CorruptIndexException(new HashValidationException("Calculated MD5 hash is null!"));
}
if (fileHash.Length != hash.Length)
{
throw new CorruptIndexException(
new HashValidationException(
string.Format(
"Hash sizes differ! FileHash({0}): {1}, hash({2}): {3}.",
fileHash.Length,
BitConverter.ToString(fileHash),
hash.Length,
BitConverter.ToString(hash))));
}
for (int i = 0; i < fileHash.Length; i++)
{
if (fileHash[i] != hash[i])
{
throw new CorruptIndexException(
new HashValidationException(
string.Format(
"Hashes are different! FileHash: {0}, hash: {1}.",
BitConverter.ToString(fileHash),
BitConverter.ToString(hash))));
}
}
}
#if __MonoCS__
finally
{
ReturnWorkItem(workItem);
}
#endif
Log.Trace("Verifying file hash of PTable '{0}' ({1} entries) done in {2}.", Path.GetFileName(Filename), Count, sw.Elapsed);
}
public void VerifyFileHash()
{
if (!IsReadOnly)
{
throw new InvalidOperationException("You can't verify hash of not-completed TFChunk.");
}
Log.Trace("Verifying hash for TFChunk '{0}'...", _filename);
#if __MonoCS__
using (var reader = AcquireReader())
{
reader.Stream.Seek(0, SeekOrigin.Begin);
var stream = reader.Stream;
#else
using (var reader = UnbufferedFileReadStream.Open(_filename))
{
var stream = reader;
#endif
var footer = _chunkFooter;
byte[] hash;
using (var md5 = MD5.Create())
{
// hash header and data
MD5Hash.ContinuousHashFor(md5, stream, 0, ChunkHeader.Size + footer.PhysicalDataSize);
// hash mapping and footer except MD5 hash sum which should always be last
MD5Hash.ContinuousHashFor(md5,
stream,
ChunkHeader.Size + footer.PhysicalDataSize,
footer.MapSize + ChunkFooter.Size - ChunkFooter.ChecksumSize);
md5.TransformFinalBlock(Empty.ByteArray, 0, 0);
hash = md5.Hash;
}
if (footer.MD5Hash == null || footer.MD5Hash.Length != hash.Length)
{
throw new HashValidationException();
}
for (int i = 0; i < hash.Length; ++i)
{
if (footer.MD5Hash[i] != hash[i])
{
throw new HashValidationException();
}
}
}
}
