private void FeedDetector(RawLine line, LineReader lineReader)
{
if (detector != null && !detector.IsDone() && line.End >= encodingBuffer.Length)
{
// The encoding buffer could have a part of a character as last byte --> Read the
// rest of this line
if (!lineAtBufferEndCompleted)
{
RawLine bufferEndLine = lineReader.Read(encodingBuffer.Length - 1);
if (bufferEndLine.End > encodingBuffer.Length)
{
FeedDetector(bufferEndLine.Bytes, (int)(encodingBuffer.Length - bufferEndLine.Begin), (int)(bufferEndLine.End - encodingBuffer.Length));
}
if (bufferEndLine.End < lineReader.StreamLength)
{
lineAtBufferEndCompleted = true;
}
}
if (line.Begin >= encodingBuffer.Length)
{
FeedDetector(line.Bytes, 0, line.Bytes.Length);
}
detector.DataEnd();
encoding = EncodingNameConversion(detector.Charset);
}
}
public Line Read(long position)
{
Line line = null;
if (cache?.RequestedLine != null)
{
if (cache.RequestedLine.Begin <= position && cache.RequestedLine.End > position)
{
line = cache.RequestedLine;
}
else if (cache.PreviousLines.Count > 0 && cache.PreviousLines[0].Begin <= position && cache.PreviousLines[cache.PreviousLines.Count - 1].End > position)
{
line = Find(cache.PreviousLines, position);
}
else if (cache.NextLines.Count > 0 && cache.NextLines[0].Begin <= position && cache.NextLines[cache.NextLines.Count - 1].End > position)
{
line = Find(cache.PreviousLines, position);
}
}
if (line != null && line.End < cache.StreamLength)
{
return(line);
}
RawLine rawLine = lineReader.Read(position);
feedDetector?.Invoke(rawLine);
return(rawLine);
}
public string FetchRange(long beginPosFirstLine, int beginCol, long endPosLastLine, int endCol)
{
Stream stream = null;
try
{
stream = GetStream();
if (stream == null)
{
HandleStreamUnavailable();
return(String.Empty);
}
LineReader lineReader = new LineReader(stream, GetEncoding(stream));
RawLine firstLine = lineReader.Read(beginPosFirstLine);
RawLine lastLine = lineReader.Read(endPosLastLine - 1);
// Special case: Begin and end in the same line
if (firstLine.Extent == lastLine.Extent)
{
if (firstLine.Content.Length > beginCol && endCol > beginCol)
{
return(firstLine.Content.Substring(beginCol, endCol - beginCol));
}
else
{
return(String.Empty);
}
}
StringBuilder sb = new StringBuilder();
// First line:
if (firstLine.Content.Length > beginCol)
{
sb.Append(firstLine.Content.Substring(beginCol));
}
// Lines between
if (firstLine.End < lastLine.Begin)
{
byte[] bytes = lineReader.Read(firstLine.End, lastLine.Begin);
sb.Append(lineReader.Encoding.GetString(bytes));
}
// Last line:
if (lastLine.Content.Length > endCol)
{
sb.Append(lastLine.Content.Substring(0, endCol));
}
else
{
sb.Append(lastLine.Content);
}
return(sb.ToString());
}
catch (Exception e)
{
HandleError(stream, e);
return(String.Empty);
}
}
