public IEnumerable <TraceHeader> ReadTraceHeaders(long startTraceIndex, long traceCount)
{
if (startTraceIndex > TraceCount)
{
throw new ArgumentException($"Cannot read a trace header with trace index: {startTraceIndex}, when file only contains {TraceCount} traces");
}
var streamLen = binaryReader.BaseStream.Length;
int traceDataBytesSz = BinaryFileHeader.SamplesPerTraceOfFile * dataSampleSize;
var dataStartIndex = TextHeaderBytesCount + BinaryHeaderBytesCount + TextHeaderBytesCount * (TextHeaders.Count() - 1);
var initStreamPosition = dataStartIndex + (240 + BinaryFileHeader.SamplesPerTraceOfFile * dataSampleSize) * startTraceIndex;
binaryReader.BaseStream.Seek(initStreamPosition, SeekOrigin.Begin);
var streamPosition = initStreamPosition;
BigArray <TraceHeader> traceHeaders = new BigArray <TraceHeader>(traceCount);
for (long tid = 0; tid < traceCount && (streamPosition < streamLen); tid++)
{
var traceHeaderByteArr = binaryReader.ReadBytes(TraceHeaderBytesCount);
var trHeader = TraceHeader.From(traceHeaderByteArr, BitConverter);
binaryReader.BaseStream.Seek(traceDataBytesSz, SeekOrigin.Current);
streamPosition += 240 + traceDataBytesSz;
traceHeaders[tid] = trHeader;
}
return(traceHeaders);
}
public TraceHeader ReadTraceHeader(long traceIndex)
{
if (traceIndex > TraceCount)
{
throw new ArgumentException($"Cannot read a trace with trace index: {traceIndex}, when file only contains {TraceCount} traces");
}
var dataStartIndex = TextHeaderBytesCount + BinaryHeaderBytesCount + TextHeaderBytesCount * (TextHeaders.Count() - 1);
var initStreamPosition = dataStartIndex + (240 + BinaryFileHeader.SamplesPerTraceOfFile * this.dataSampleSize) * traceIndex;
this.binaryReader.BaseStream.Seek(initStreamPosition, SeekOrigin.Begin);
var traceHeaderByteArr = this.binaryReader.ReadBytes(TraceHeaderBytesCount);
var trHeader = TraceHeader.From(traceHeaderByteArr, BitConverter);
return(trHeader);
}
public IEnumerable <Trace> ReadTraces(long startTraceIndex, long traceCount)
{
if (startTraceIndex > TraceCount)
{
throw new ArgumentException($"Cannot read a trace with trace index: {startTraceIndex}, when file only contains {TraceCount} traces");
}
var initStreamPosition = (3600 + ((TextHeaders.Count() - 1) * TextHeaderBytesCount)) + (240 + BinaryFileHeader.SamplesPerTraceOfFile * dataSampleSize) * startTraceIndex;
binaryReader.BaseStream.Seek(initStreamPosition, SeekOrigin.Begin);
BigList <Trace> traces = new BigList <Trace>(traceCount);
for (long tid = 0; tid < traceCount; tid++)
{
var traceHeaderByteArr = binaryReader.ReadBytes(TraceHeaderBytesCount);
var traceData = traceDataReadingFunc(BinaryFileHeader.SamplesPerTraceOfFile);// _binaryreader.ReadIbmSingles(Header.SamplesPerTraceOfFile);
var trHeader = TraceHeader.From(traceHeaderByteArr, BitConverter);
var seismicTrace = new Trace(trHeader, traceData);
traces.Add(seismicTrace);
}
return(traces);
}
