private void CreateWriterWorkItemForExistingChunk(int writePosition, out ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = GetWriteStream(_filename);
try {
chunkHeader = ReadHeader(stream);
if (chunkHeader.Version == (byte)ChunkVersions.Unaligned)
{
Log.Verbose("Upgrading ongoing file {chunk} to version 3", _filename);
var newHeader = new ChunkHeader((byte)ChunkVersions.Aligned,
chunkHeader.ChunkSize,
chunkHeader.ChunkStartNumber,
chunkHeader.ChunkEndNumber,
false,
chunkHeader.ChunkId);
stream.Seek(0, SeekOrigin.Begin);
chunkHeader = newHeader;
var head = newHeader.AsByteArray();
stream.Write(head, 0, head.Length);
stream.Flush();
stream.Seek(0, SeekOrigin.Begin);
}
} catch {
stream.Dispose();
((IDisposable)md5).Dispose();
throw;
}
var realPosition = GetRawPosition(writePosition);
MD5Hash.ContinuousHashFor(md5, stream, 0, realPosition);
stream.Position = realPosition; // this reordering fixes bug in Mono implementation of FileStream
_writerWorkItem = new WriterWorkItem(stream, null, md5);
}
public void VerifyFileHash()
{
if (!IsReadOnly)
{
throw new InvalidOperationException("You can't verify hash of not-completed TFChunk.");
}
var workItem = GetReaderWorkItem();
try
{
var footer = ReadFooter(workItem.Stream);
byte[] hash;
using (var md5 = MD5.Create())
{
workItem.Stream.Seek(0, SeekOrigin.Begin);
// hash header and data
MD5Hash.ContinuousHashFor(md5,
workItem.Stream,
0,
ChunkHeader.Size + footer.ActualDataSize);
// hash mapping and footer except MD5 hash sum which should always be last
MD5Hash.ContinuousHashFor(md5,
workItem.Stream,
ChunkHeader.Size + footer.ActualChunkSize,
footer.MapSize + ChunkFooter.Size - ChunkFooter.ChecksumSize);
md5.TransformFinalBlock(new byte[0], 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();
}
}
}
finally
{
ReturnReaderWorkItem(workItem);
}
}
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();
}
}
}
}
private void CreateWriterWorkItemForExistingChunk(int writePosition, out ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
try
{
chunkHeader = ReadHeader(stream);
}
catch
{
stream.Dispose();
((IDisposable)md5).Dispose();
throw;
}
var realPosition = GetRawPosition(writePosition);
MD5Hash.ContinuousHashFor(md5, stream, 0, realPosition);
stream.Position = realPosition; // this reordering fixes bug in Mono implementation of FileStream
_writerWorkItem = new WriterWorkItem(stream, null, md5);
}
private void CreateWriterWorkItemForExistingChunk(int writePosition, out ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
var writer = new BinaryWriter(stream);
try
{
chunkHeader = ReadHeader(stream);
}
catch
{
stream.Dispose();
((IDisposable)md5).Dispose();
throw;
}
var realPosition = GetRealPosition(writePosition, inMemory: false);
stream.Position = realPosition;
MD5Hash.ContinuousHashFor(md5, stream, 0, realPosition);
_writerWorkItem = new WriterWorkItem(stream, writer, md5);
}
