/// <summary>
/// Updates the data size and CRC in the file header
/// Updates file CRC
/// </summary>
public void Close()
{
if (open == false)
{
throw new FitException("Encode:Close - Encode not opened yet, must call Encode:Open()");
}
// Rewrites the header now that the datasize is known
header.DataSize = (uint)(fitDest.Length - header.Size);
header.UpdateCRC();
header.Write(fitDest);
// Compute and write the file CRC to the end of the file
byte[] data = new byte[fitDest.Length];
fitDest.Position = 0;
fitDest.Read(data, 0, data.Length);
ushort fileCrc = CRC.Calc16(data, data.Length);
byte[] buffer = BitConverter.GetBytes(fileCrc);
fitDest.Write(buffer, 0, 2);
}
/// <summary>
/// Reads a FIT binary file.
/// </summary>
/// <param name="fitStream">Seekable (file)stream to parse.</param>
/// <returns>
/// Returns true if reading finishes successfully.
/// </returns>
public bool Read(Stream fitStream)
{
bool readOK = true;
try
{
// Attempt to read header
fileHeader = new Header(fitStream);
readOK &= fileHeader.IsValid();
if (!readOK)
{
throw new FitException("FIT decode error: File is not FIT format. Check file header data type.");
}
if ((fileHeader.ProtocolVersion & Fit.ProtocolVersionMajorMask) > (Fit.ProtocolMajorVersion << Fit.ProtocolVersionMajorShift))
{
// The decoder does not support decode accross protocol major revisions
throw new FitException(String.Format("FIT decode error: Protocol Version {0}.X not supported by SDK Protocol Ver{1}.{2} ", (fileHeader.ProtocolVersion & Fit.ProtocolVersionMajorMask) >> Fit.ProtocolVersionMajorShift, Fit.ProtocolMajorVersion, Fit.ProtocolMinorVersion));
}
// Read data messages and definitions
while (fitStream.Position < fitStream.Length - 2)
{
DecodeNextMessage(fitStream);
}
// Is the file CRC ok?
byte[] data = new byte[fitStream.Length];
fitStream.Position = 0;
fitStream.Read(data, 0, data.Length);
readOK &= (CRC.Calc16(data, data.Length) == 0x0000);
}
catch (EndOfStreamException e)
{
readOK = false;
Debug.WriteLine("{0} caught and ignored. ", e.GetType().Name);
throw new FitException("Decode:Read - Unexpected End of File", e);
}
return(readOK);
}
/// <summary>
/// Reads a FIT binary File
/// </summary>
/// <param name="fitStream">Seekable (file)stream to parse.</param>
/// <param name="mode">Decode Mode to use for reading the file</param>
/// <returns>
/// Returns true if reading finishes successfully.
/// </returns>
public bool Read(Stream fitStream, DecodeMode mode)
{
bool readOK = true;
long fileSize = 0;
long filePosition = fitStream.Position;
try
{
// Attempt to read header
if (mode == DecodeMode.Normal)
{
fileHeader = new Header(fitStream);
readOK &= fileHeader.IsValid();
// Get the file size from the header
// When the data size is invalid set the file size to the fitstream length
if (!invalidDataSize)
{
fileSize = fileHeader.Size + fileHeader.DataSize + CRCSIZE;
}
else
{
fileSize = fitStream.Length;
}
if (!readOK)
{
throw new FitException("FIT decode error: File is not FIT format. Check file header data type. Error at stream position: " + fitStream.Position);
}
if ((fileHeader.ProtocolVersion & Fit.ProtocolVersionMajorMask) > (Fit.ProtocolMajorVersion << Fit.ProtocolVersionMajorShift))
{
// The decoder does not support decode accross protocol major revisions
throw new FitException(String.Format("FIT decode error: Protocol Version {0}.X not supported by SDK Protocol Ver{1}.{2} ", (fileHeader.ProtocolVersion & Fit.ProtocolVersionMajorMask) >> Fit.ProtocolVersionMajorShift, Fit.ProtocolMajorVersion, Fit.ProtocolMinorVersion));
}
}
else if (mode == DecodeMode.InvalidHeader)
{
// When skipping the header force the stream position to be at the beginning of the data
// Also the fileSize is the length of the filestream.
fitStream.Position += Fit.HeaderWithCRCSize;
fileSize = fitStream.Length;
}
else if (mode == DecodeMode.DataOnly)
{
// When the stream is only data move the position of the stream
// to the start. FileSize is the length of the stream
fitStream.Position = 0;
fileSize = fitStream.Length;
}
else
{
throw new FitException("Invalid Decode Mode Provided to read");
}
// Read data messages and definitions
while (fitStream.Position < (filePosition + fileSize - CRCSIZE))
{
DecodeNextMessage(fitStream);
}
// Is the file CRC ok?
if ((mode == DecodeMode.Normal) && !invalidDataSize)
{
byte[] data = new byte[fileSize];
fitStream.Position = filePosition;
fitStream.Read(data, 0, data.Length);
readOK &= (CRC.Calc16(data, data.Length) == 0x0000);
fitStream.Position = filePosition + fileSize;
}
}
catch (EndOfStreamException e)
{
readOK = false;
Debug.WriteLine("{0} caught and ignored. ", e.GetType().Name);
throw new FitException("Decode:Read - Unexpected End of File at stream position" + fitStream.Position, e);
}
catch (FitException e)
{
// When attempting to decode files with invalid data size this indicates the EOF.
if (!invalidDataSize)
{
throw e;
}
}
return(readOK);
}
