/// <summary>
/// Function to check SCP.
/// </summary>
/// <param name="buffer">byte array to do check in</param>
/// <param name="offset">position to start checking</param>
/// <param name="crc">value crc should be</param>
/// <param name="length">length of section</param>
/// <returns>0 on success</returns>
public bool CheckSCP(byte[] buffer, int offset, ushort crc, int length)
{
CRCTool crctool = new CRCTool();
crctool.Init(CRCTool.CRCCode.CRC_CCITT);
if (crctool.CalcCRCITT(buffer, offset + Marshal.SizeOf(_CRC), length - Marshal.SizeOf(_CRC)) == crc)
{
return(true);
}
return(false);
}
/// <summary>
/// Function to write an SCP Section.
/// </summary>
/// <param name="buffer">buffer to write to</param>
/// <param name="offset">position on buffer to start writing</param>
/// <returns>error:
/// 0x00) succes
/// 0x01) section incorrect
/// 0x02) no buffer provided or buffer to small for header
/// rest) Section specific error </returns>
public int Write(byte[] buffer, int offset)
{
Length = _getLength() + Size;
if (Length == Size)
{
return(0);
}
if (Works())
{
if ((buffer != null) &&
((offset + Length) <= buffer.Length))
{
int crcoffset = offset;
offset += Marshal.SizeOf(CRC);
SectionID = getSectionID();
BytesTool.writeBytes(SectionID, buffer, offset, Marshal.SizeOf(SectionID), true);
offset += Marshal.SizeOf(SectionID);
BytesTool.writeBytes(Length, buffer, offset, Marshal.SizeOf(Length), true);
offset += Marshal.SizeOf(Length);
BytesTool.writeBytes(SectionVersionNr, buffer, offset, Marshal.SizeOf(SectionVersionNr), true);
offset += Marshal.SizeOf(SectionVersionNr);
BytesTool.writeBytes(ProtocolVersionNr, buffer, offset, Marshal.SizeOf(ProtocolVersionNr), true);
offset += Marshal.SizeOf(ProtocolVersionNr);
offset += BytesTool.copy(buffer, offset, Reserved, 0, _ReservedLength);
int err = _Write(buffer, offset);
if (err == 0)
{
CRCTool crc = new CRCTool();
crc.Init(CRCTool.CRCCode.CRC_CCITT);
CRC = crc.CalcCRCITT(buffer, crcoffset + Marshal.SizeOf(CRC), Length - Marshal.SizeOf(CRC));
BytesTool.writeBytes(CRC, buffer, crcoffset, Marshal.SizeOf(CRC), true);
}
return(err << 2);
}
return(0x2);
}
return(0x1);
}
/// <summary>
/// Function to read an SCP Section.
/// </summary>
/// <param name="buffer">buffer to read from</param>
/// <param name="offset">position on buffer to start reading</param>
/// <returns>error:
/// 0x00) succes
/// 0x01) no buffer provided or buffer to small for header
/// 0x02) Section ID doesn't seem to be right
/// 0x04) buffer not big enough for entire section
/// 0x08) CRC Check Failed
/// rest) Section specific error </returns>
public int Read(byte[] buffer, int offset, int length)
{
Empty();
if ((buffer != null) &&
(offset + Size) <= buffer.Length)
{
int crcoffset = offset;
CRC = (ushort)BytesTool.readBytes(buffer, offset, Marshal.SizeOf(CRC), true);
offset += Marshal.SizeOf(CRC);
SectionID = (ushort)BytesTool.readBytes(buffer, offset, Marshal.SizeOf(SectionID), true);
if (SectionID != getSectionID())
{
return(0x2);
}
offset += Marshal.SizeOf(SectionID);
Length = (int)BytesTool.readBytes(buffer, offset, Marshal.SizeOf(Length), true);
if (((length != Length) &&
(SectionID != 0)) ||
(crcoffset + Length) > buffer.Length)
{
return(0x4);
}
offset += Marshal.SizeOf(Length);
CRCTool crc = new CRCTool();
crc.Init(CRCTool.CRCCode.CRC_CCITT);
if (CRC != crc.CalcCRCITT(buffer, crcoffset + Marshal.SizeOf(CRC), Length - Marshal.SizeOf(CRC)))
{
return(0x8);
}
SectionVersionNr = (byte)BytesTool.readBytes(buffer, offset, Marshal.SizeOf(SectionVersionNr), true);
offset += Marshal.SizeOf(SectionVersionNr);
ProtocolVersionNr = (byte)BytesTool.readBytes(buffer, offset, Marshal.SizeOf(ProtocolVersionNr), true);
offset += Marshal.SizeOf(ProtocolVersionNr);
offset += BytesTool.copy(Reserved, 0, buffer, offset, _ReservedLength);
return(_Read(buffer, offset) << 4);
}
return(0x1);
}
public override int Write(byte[] buffer, int offset)
{
// Check if format works.
if (Works())
{
_Length = getFileSize();
if ((buffer != null) &&
((offset + _Length) <= buffer.Length) &&
(_Default[0] is SCPSection0))
{
// Write length of file.
BytesTool.writeBytes(_Length, buffer, offset + Marshal.SizeOf(_CRC), Marshal.SizeOf(_Length), true);
SCPSection0 pointers = (SCPSection0)_Default[0];
// Write all sections in format.
for (int loper = 0; loper < pointers.getNrPointers(); loper++)
{
if (loper < _MinNrSections)
{
_Default[loper].Write(buffer, offset + pointers.getIndex(loper) - 1);
}
else if ((pointers.getLength(loper) > SCPSection.Size) &&
(_Manufactor[loper - _MinNrSections] != null))
{
_Manufactor[loper - _MinNrSections].Write(buffer, offset + pointers.getIndex(loper) - 1);
}
}
// Calculate CRC of byte array.
CRCTool crctool = new CRCTool();
crctool.Init(CRCTool.CRCCode.CRC_CCITT);
_CRC = crctool.CalcCRCITT(buffer, offset + Marshal.SizeOf(_CRC), _Length - Marshal.SizeOf(_CRC));
BytesTool.writeBytes(_CRC, buffer, offset, Marshal.SizeOf(_CRC), true);
return(0x0);
}
return(0x2);
}
return(0x1);
}
public override bool CheckFormat(Stream input, int offset)
{
if ((input != null) &&
input.CanRead &&
input.CanSeek &&
(offset >= 0))
{
byte[] buff = new byte[_Header.Size() + BYTES_BEFORE_HEADER];
long origin = input.Position;
input.Position += offset;
if (BytesTool.readStream(input, buff, 0, buff.Length) == buff.Length)
{
string magicNumber = BytesTool.readString(buff, 0, MAGIC_NUMBER.Length);
if (string.Compare(magicNumber, MAGIC_NUMBER) == 0)
{
ISHNEHeader head = new ISHNEHeader();
if ((head.Read(buff, BYTES_BEFORE_HEADER, buff.Length - BYTES_BEFORE_HEADER) == 0) &&
head.Works())
{
if (head.VarBlockSize > 0)
{
byte[] buffTwo = new byte[buff.Length + head.VarBlockSize];
BytesTool.copy(buffTwo, 0, buff, 0, buff.Length);
if (BytesTool.readStream(input, buffTwo, buff.Length, head.VarBlockSize) != head.VarBlockSize)
{
input.Position = origin;
return(false);
}
buff = buffTwo;
}
input.Position = origin;
if (_CRCValidation)
{
CRCTool tool = new CRCTool();
tool.Init(CRCTool.CRCCode.CRC_CCITT);
ushort crc = (ushort)BytesTool.readBytes(buff, MAGIC_NUMBER.Length, SHORT_SIZE, true);
return(crc == tool.CalcCRCITT(buff, BYTES_BEFORE_HEADER, buff.Length - BYTES_BEFORE_HEADER));
}
return(true);
}
}
}
input.Position = origin;
}
return(false);
}
public override int Write(Stream output)
{
try
{
if ((output != null) &&
output.CanWrite)
{
if (Works())
{
_Header.VarBlockOffset = _Header.Size() + BYTES_BEFORE_HEADER;
_Header.VarBlockSize = (_HeaderAndVarBlock != null) && (_HeaderAndVarBlock.Length < _Header.VarBlockOffset) ? _HeaderAndVarBlock.Length - _Header.VarBlockOffset : 0;
_Header.ECGOffset = _Header.VarBlockOffset + _Header.VarBlockSize;
if ((_HeaderAndVarBlock == null) ||
(_HeaderAndVarBlock.Length < _Header.ECGOffset))
{
_HeaderAndVarBlock = new byte[_Header.ECGOffset];
}
// Begin: code that handles overriding of AVM
double avmOverride = _AVMOverride;
int nrLeads = _Signals.NrLeads;
double[] avm = new double[nrLeads];
if (avmOverride <= 0.0)
{
for (int i = 0; i < nrLeads; i++)
{
avm[i] = _Header.GetLeadAmplitude(i);
}
}
else
{
for (int i = 0; i < nrLeads; i++)
{
_Header.ECGLeadResolution[i] = (Int16)(avmOverride * ISHNEHeader.UV_TO_AMPLITUDE);
avm[i] = avmOverride;
}
}
// End: code that handles overriding of AVM
BytesTool.writeString(MAGIC_NUMBER, _HeaderAndVarBlock, 0, MAGIC_NUMBER.Length);
if (_Header.Write(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _Header.Size()) != 0)
{
return(0x4);
}
CRCTool tool = new CRCTool();
tool.Init(CRCTool.CRCCode.CRC_CCITT);
ushort crc = tool.CalcCRCITT(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _HeaderAndVarBlock.Length - BYTES_BEFORE_HEADER);
BytesTool.writeBytes(crc, _HeaderAndVarBlock, MAGIC_NUMBER.Length, SHORT_SIZE, true);
output.Write(_HeaderAndVarBlock, 0, _Header.ECGOffset);
if (_Signals.IsBuffered)
{
BufferedSignals bs = _Signals.AsBufferedSignals;
int rhythmCur = bs.RealRhythmStart,
rhythmEnd = bs.RealRhythmEnd,
stepSize = 60 * bs.RhythmSamplesPerSecond;
byte[] data = null;
for (; rhythmCur < rhythmEnd; rhythmCur += stepSize)
{
if (!bs.LoadSignal(rhythmCur, rhythmCur + stepSize))
{
return(0x8);
}
int buff_size = _WriteSignal(ref data, _Signals, avm);
if (buff_size < 0)
{
return(0x10);
}
output.Write(data, 0, buff_size);
}
}
else
{
int rhythmStart, rhythmEnd;
_Signals.CalculateStartAndEnd(out rhythmStart, out rhythmEnd);
byte[] data = null;
int buff_size = _WriteSignal(ref data, _Signals, avm);
if (buff_size < 0)
{
return(0x10);
}
output.Write(data, 0, buff_size);
}
return(0x0);
}
return(0x2);
}
}
catch
{
return(0x10);
}
return(0x1);
}
public override int Read(Stream input, int offset)
{
_Signals = null;
if ((input != null) &&
input.CanRead &&
input.CanSeek &&
(offset >= 0))
{
_InputStreamOffset = input.Position + offset;
_HeaderAndVarBlock = new byte[_Header.Size() + BYTES_BEFORE_HEADER];
input.Position += offset;
if (BytesTool.readStream(input, _HeaderAndVarBlock, 0, _HeaderAndVarBlock.Length) == _HeaderAndVarBlock.Length)
{
string magicNumber = BytesTool.readString(_HeaderAndVarBlock, 0, MAGIC_NUMBER.Length);
if (string.Compare(magicNumber, MAGIC_NUMBER) == 0)
{
if ((_Header.Read(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _HeaderAndVarBlock.Length - BYTES_BEFORE_HEADER) == 0) &&
_Header.Works())
{
if (_Header.VarBlockSize > 0)
{
byte[] buff = new byte[_HeaderAndVarBlock.Length + _Header.VarBlockSize];
BytesTool.copy(buff, 0, _HeaderAndVarBlock, 0, _HeaderAndVarBlock.Length);
if (BytesTool.readStream(input, buff, _HeaderAndVarBlock.Length, _Header.VarBlockSize) != _Header.VarBlockSize)
{
return(0x10);
}
_HeaderAndVarBlock = buff;
}
CRCTool tool = new CRCTool();
tool.Init(CRCTool.CRCCode.CRC_CCITT);
ushort crc = (ushort)BytesTool.readBytes(_HeaderAndVarBlock, MAGIC_NUMBER.Length, SHORT_SIZE, true);
if (!_CRCValidation ||
(crc == tool.CalcCRCITT(_HeaderAndVarBlock, BYTES_BEFORE_HEADER, _HeaderAndVarBlock.Length - BYTES_BEFORE_HEADER)))
{
if (input.CanSeek)
{
long nrSamples = (input.Length - _Header.ECGOffset) / 2;
if ((nrSamples > _Header.ECGNrSamples) &&
(nrSamples <= int.MaxValue))
{
_Header.ECGNrSamples = (int)nrSamples;
}
}
BufferedSignals sigs = new BufferedSignals(this, (byte)_Header.ECGNrLeads);
// Begin: code that handles overriding of AVM
double avm = _AVMOverride;
if (avm <= 0.0)
{
avm = double.MaxValue;
for (int i = 0; i < _Header.ECGNrLeads; i++)
{
sigs[i] = new Signal();
sigs[i].Type = _Header.GetLeadType(i);
double val = _Header.GetLeadAmplitude(i);
if (val < avm)
{
avm = val;
}
}
}
else
{
for (int i = 0; i < _Header.ECGNrLeads; i++)
{
sigs[i] = new Signal();
sigs[i].Type = _Header.GetLeadType(i);
}
}
// End: code that handles overriding of AVM
sigs.RhythmAVM = avm;
sigs.RhythmSamplesPerSecond = _Header.ECGSampleRate;
sigs.RealRhythmSamplesPerSecond = _Header.ECGSampleRate;
sigs.RealRhythmStart = 0;
sigs.RealRhythmEnd = _Header.ECGNrSamples / _Header.ECGNrLeads;
_InputStream = input;
_Signals = sigs;
sigs.Init();
return(0x0);
}
return(0x20);
}
return(0x8);
}
return(0x4);
}
return(0x2);
}
return(0x1);
}
