/// <summary>
/// Is called when BeginWritePeriodTerminated stream.BeginReadLine has completed.
/// </summary>
/// <param name="e">Callback data.</param>
private void InternalBeginWritePeriodTerminatedReadLineCompleted(ReadLine_EventArgs e)
{
try{
// Error happened during read.
if(e.Exception != null){
InternalBeginWritePeriodTerminatedCompleted(e.Exception);
}
// We reached end of stream, no more data.
else if(e.ReadedCount == 0){
InternalBeginWritePeriodTerminatedCompleted(null);
}
else{
m_BeginWritePeriodTerminated_Readed += e.ReadedCount;
// Maximum allowed data size exceeded.
if(m_BeginWritePeriodTerminated_Readed > m_BeginWritePeriodTerminated_MaxSize){
throw new DataSizeExceededException();
}
// If line starts with period, addtional period is added.
if(e.LineBuffer[0] == '.'){
m_pBeginWritePeriodTerminated_BufferedStream.WriteByte((int)'.');
m_BeginWritePeriodTerminated_Written++;
}
// Write readed line to buffered stream.
m_pBeginWritePeriodTerminated_BufferedStream.Write(e.LineBuffer,0,e.Count);
m_pBeginWritePeriodTerminated_BufferedStream.Write(m_LineBreak,0,m_LineBreak.Length);
m_BeginWritePeriodTerminated_Written += e.Count + m_LineBreak.Length;
}
}
catch(Exception x){
InternalBeginWritePeriodTerminatedCompleted(x);
}
}
/// <summary>
/// Is called when asynchrounous line reading has completed.
/// </summary>
/// <param name="e">Callback data.</param>
private void OnReadPeriodTerminated_ReadLine_Completed(ReadLine_EventArgs e)
{
try{
m_TotalReadedCount += e.ReadedCount;
// We got error.
if(e.Exception != null){
try{
m_pBufferedStream.Flush();
m_pStoreStream.Flush();
}
catch{
// Just skip excpetions here, otherwise we may hide original exception,
// if exceptions is thrown by flush.
}
// Maximum line size exceeded, but junk data wanted.
if(m_ExceededAction == SizeExceededAction.JunkAndThrowException && e.Exception is LineSizeExceededException){
m_IsLineSizeExceeded = true;
// Start reading next data buffer block.
m_pStreamHelper.BeginReadLineInternal(m_pLineBuffer,m_ExceededAction,null,new ReadLineCallback(this.OnReadPeriodTerminated_ReadLine_Completed),false,false);
}
// Unknown exception or ThrowException, so we are done.
else{
ReadPeriodTerminatedCompleted(e.Exception);
}
}
// We reached end of stream before got period terminator.
else if(e.ReadedCount == 0){
ReadPeriodTerminatedCompleted(new IncompleteDataException("Source stream was reached end of stream and data is not period terminated !"));
}
// We got terminator, so we are done now.
else if(e.Count == 1 && e.LineBuffer[0] == '.'){
m_pBufferedStream.Flush();
m_pStoreStream.Flush();
// LineSizeExceeded.
if(m_IsLineSizeExceeded){
ReadPeriodTerminatedCompleted(new LineSizeExceededException());
}
// DataSizeExceeded.
else if(m_TotalReadedCount > m_MaxSize){
ReadPeriodTerminatedCompleted(new DataSizeExceededException());
}
// Completed successfuly.
else{
ReadPeriodTerminatedCompleted(null);
}
}
// Just append line to store stream and get next line.
else{
// Maximum allowed data size exceeded.
if(m_TotalReadedCount > m_MaxSize){
if(m_ExceededAction == SizeExceededAction.ThrowException){
ReadPeriodTerminatedCompleted(new DataSizeExceededException());
return;
}
// Junk data.
//else{
//}
}
else{
// If line starts with period, first period is removed.
if(e.LineBuffer[0] == '.'){
m_pBufferedStream.Write(e.LineBuffer,1,e.Count - 1);
}
// Normal line.
else{
m_pBufferedStream.Write(e.LineBuffer,0,e.Count);
}
// Add line break.
m_pBufferedStream.Write(m_pStreamHelper.m_LineBreak,0,m_pStreamHelper.m_LineBreak.Length);
}
// Start getting new data buffer block.
m_pStreamHelper.BeginReadLineInternal(m_pLineBuffer,m_ExceededAction,null,new ReadLineCallback(this.OnReadPeriodTerminated_ReadLine_Completed),false,false);
}
}
catch(Exception x){
ReadPeriodTerminatedCompleted(x);
}
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="stream">Source stream.</param>
/// <param name="maxLineSize">Specifies maximum line size in bytes.</param>
/// <param name="bufferRead">Specifies if source stream reads are buffered..</param>
public StreamHelper(Stream stream,int maxLineSize,bool bufferRead)
{
if(stream == null){
throw new ArgumentNullException("stream");
}
if(maxLineSize < 1 || maxLineSize > 32000){
throw new ArgumentException("Parameter maxLineSize value must be >= 1 and <= 32000 !");
}
m_IsReadBuffered = bufferRead;
if(m_IsReadBuffered){
m_pReadBuffer = new byte[32000];
}
m_pStream = stream;
m_pLineBuffer = new byte[maxLineSize];
m_MaxLineSize = maxLineSize;
m_pRLine_EventArgs = new ReadLine_EventArgs();
m_pRLine_ByteBuffer = new byte[1];
}