private void ReadDigitalValues(byte[] buffer, int index)
{
int valueIndex = m_schema.AnalogChannels.Length;
// Parse all digital record values
for (int i = 0; i < m_schema.DigitalWords; i++)
{
// Read next digital word
ushort digitalWord = LittleEndian.ToUInt16(buffer, index);
index += 2;
// Distribute each bit of digital word through next 16 digital values
for (int j = 0; j < 16 && valueIndex < Values.Length; j++, valueIndex++)
{
Values[valueIndex] = digitalWord.CheckBits(BitExtensions.BitVal(j)) ? 1.0D : 0.0D;
}
}
}
/// <summary>
/// Writes next COMTRADE record in ASCII format.
/// </summary>
/// <param name="output">Destination stream.</param>
/// <param name="schema">Source schema.</param>
/// <param name="timestamp">Record timestamp (implicitly castable as <see cref="DateTime"/>).</param>
/// <param name="values">Values to write - 16-bit digitals should exist as a word in an individual double value, method will write out bits.</param>
/// <param name="sample">User incremented sample index.</param>
/// <param name="injectFracSecValue">Determines if FRACSEC value should be automatically injected into stream as first digital - defaults to <c>true</c>.</param>
/// <param name="fracSecValue">FRACSEC value to inject into output stream - defaults to 0x0000.</param>
/// <remarks>
/// This function is primarily intended to write COMTRADE ASCII data records based on synchrophasor data
/// (see Annex H: Schema for Phasor Data 2150 Using the COMTRADE File Standard in IEEE C37.111-2010),
/// it may be necessary to manually write records for other COMTRADE needs (e.g., non 16-bit digitals).
/// </remarks>
public static void WriteNextRecordAscii(StreamWriter output, Schema schema, Ticks timestamp, double[] values, uint sample, bool injectFracSecValue = true, ushort fracSecValue = 0x0000)
{
// Make timestamp relative to beginning of file
timestamp -= schema.StartTime.Value;
uint microseconds = (uint)(timestamp.ToMicroseconds() / schema.TimeFactor);
StringBuilder line = new StringBuilder();
bool isFirstDigital = true;
line.Append(sample);
line.Append(',');
line.Append(microseconds);
for (int i = 0; i < values.Length; i++)
{
double value = values[i];
if (i < schema.AnalogChannels.Length)
{
value -= schema.AnalogChannels[i].Adder;
value /= schema.AnalogChannels[i].Multiplier;
line.Append(',');
line.Append(value.ToString(CultureInfo.InvariantCulture));
}
else
{
if (isFirstDigital)
{
// Handle automatic injection of IEEE C37.118 FRACSEC digital value if requested
isFirstDigital = false;
if (injectFracSecValue)
{
for (int j = 0; j < 16; j++)
{
line.Append(',');
line.Append(fracSecValue.CheckBits(BitExtensions.BitVal(j)) ? 1 : 0);
}
}
}
ushort digitalWord = (ushort)value;
for (int j = 0; j < 16; j++)
{
line.Append(',');
line.Append(digitalWord.CheckBits(BitExtensions.BitVal(j)) ? 1 : 0);
}
}
}
// Make sure FRACSEC values are injected
if (isFirstDigital && injectFracSecValue)
{
for (int j = 0; j < 16; j++)
{
line.Append(',');
line.Append(fracSecValue.CheckBits(BitExtensions.BitVal(j)) ? 1 : 0);
}
}
output.WriteLine(line.ToString());
}
// Handle binary file read
private bool ReadNextBinary()
{
FileStream currentFile = m_fileStreams[m_streamIndex];
int recordLength = m_schema.BinaryRecordLength;
byte[] buffer = new byte[recordLength];
// Read next record from file
int bytesRead = currentFile.Read(buffer, 0, recordLength);
// See if we have reached the end of this file
if (bytesRead == 0)
{
m_streamIndex++;
// There is more to read if there is another file
return(m_streamIndex < m_fileStreams.Length && ReadNext());
}
if (bytesRead == recordLength)
{
int index = 0;
// Read sample index
uint sample = LittleEndian.ToUInt32(buffer, index);
index += 4;
// Get timestamp of this record
m_timestamp = DateTime.MinValue;
// If sample rates are defined, this is the preferred method for timestamp resolution
if (m_inferTimeFromSampleRates && m_schema.SampleRates.Length > 0)
{
// Find rate for given sample
SampleRate sampleRate = m_schema.SampleRates.LastOrDefault(sr => sample <= sr.EndSample);
if (sampleRate.Rate > 0.0D)
{
m_timestamp = new DateTime(Ticks.FromSeconds(1.0D / sampleRate.Rate * sample) + m_schema.StartTime.Value);
}
}
// Read microsecond timestamp
uint microseconds = LittleEndian.ToUInt32(buffer, index);
index += 4;
// Fall back on specified microsecond time
if (m_timestamp == DateTime.MinValue)
{
m_timestamp = new DateTime(Ticks.FromMicroseconds(microseconds * m_schema.TimeFactor) + m_schema.StartTime.Value);
}
// Parse all analog record values
for (int i = 0; i < m_schema.AnalogChannels.Length; i++)
{
// Read next value
m_values[i] = LittleEndian.ToInt16(buffer, index) * m_schema.AnalogChannels[i].Multiplier + m_schema.AnalogChannels[i].Adder;
index += 2;
}
int valueIndex = m_schema.AnalogChannels.Length;
int digitalWords = m_schema.DigitalWords;
ushort digitalWord;
for (int i = 0; i < digitalWords; i++)
{
// Read next digital word
digitalWord = LittleEndian.ToUInt16(buffer, index);
index += 2;
// Distribute each bit of digital word through next 16 digital values
for (int j = 0; j < 16 && valueIndex < m_values.Length; j++, valueIndex++)
{
m_values[valueIndex] = digitalWord.CheckBits(BitExtensions.BitVal(j)) ? 1.0D : 0.0D;
}
}
}
else
{
throw new InvalidOperationException("Failed to read enough bytes from COMTRADE file for a record as defined by schema - possible schema/data file mismatch or file corruption.");
}
return(true);
}