public IEnumerable <Line> ReadLines(ScrollRequest scroll)
{
var page = GetPage(scroll);
if (page.Size == 0)
{
yield break;
}
using (var stream = File.Open(Info.FullName, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, Encoding, false))
{
if (page.Size == 0)
{
yield break;
}
foreach (var i in Enumerable.Range(page.Start, page.Size))
{
if (i > Count - 1)
{
continue;
}
var start = Matches[i];
var startPosition = reader.AbsolutePosition();
if (startPosition != start)
{
reader.DiscardBufferedData();
reader.BaseStream.Seek(start, SeekOrigin.Begin);
}
startPosition = reader.AbsolutePosition();
var line = reader.ReadLine();
var endPosition = reader.AbsolutePosition();
var info = new LineInfo(i + 1, i, startPosition, endPosition);
var ontail = endPosition >= TailInfo.TailStartsAt && DateTime.Now.Subtract(TailInfo.LastTail).TotalSeconds < 1
? DateTime.Now
: (DateTime?)null;
yield return(new Line(info, line, ontail));
}
}
}
}
public static IEnumerable <Line> ReadLinesByPosition(this FileInfo source, long[] positions, Func <int, bool> isEndOfTail = null)
{
using (var stream = File.Open(source.FullName, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, Encoding.Default, true))
{
foreach (var position in positions)
{
if (reader.AbsolutePosition() != position)
{
reader.DiscardBufferedData();
stream.Seek(position, SeekOrigin.Begin);
}
var line = reader.ReadLine();
yield return(new Line((int)position, line, null));
}
}
}
}
public static IEnumerable<Line> ReadLinesByPosition(this FileInfo source, long[] positions, Func<int, bool> isEndOfTail = null)
{
using (var stream = File.Open(source.FullName, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, Encoding.Default, true))
{
foreach (var position in positions)
{
if (reader.AbsolutePosition() != position)
{
reader.DiscardBufferedData();
stream.Seek(position, SeekOrigin.Begin);
}
var line = reader.ReadLine();
yield return new Line((int)position, line,null);
}
}
}
}
public IEnumerable <Line> ReadLines(ScrollRequest scroll)
{
var current = ReverseLinking(this);
var page = GetPage(scroll, this);
var lastValueWrapper = new LastValueWrapper();
if (page.Size == 0)
{
yield break;
}
while (current != null)
{
using (
var stream = File.Open(current.Info.FullName, FileMode.Open, FileAccess.Read,
FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, current.Encoding, false))
{
if (page.Size == 0)
{
yield break;
}
if (lastValueWrapper.LastPageIndex == page.Start + page.Size)
{
yield break;
}
var counter = 0;
long lastEndPos = 0;
foreach (
var i in
Enumerable.Range(
lastValueWrapper.LastPageIndex > 0 ? lastValueWrapper.LastPageIndex : page.Start,
page.Size - counter))
{
if (i == page.Start + page.Size)
{
yield break;
}
if (i - lastValueWrapper.LastMatchesSize > current.Count - 1)
{
lastValueWrapper.LastEndPosition += lastEndPos + 1;
lastValueWrapper.LastMatchesSize += current.Count;
break;
}
var start = current.Matches[i - lastValueWrapper.LastMatchesSize];
var startPosition = reader.AbsolutePosition();
if (startPosition != start)
{
reader.DiscardBufferedData();
reader.BaseStream.Seek(start, SeekOrigin.Begin);
}
startPosition = reader.AbsolutePosition();
var line = reader.ReadLine();
var endPosition = reader.AbsolutePosition();
var info = new LineInfo(i + 1, i, startPosition + lastValueWrapper.LastEndPosition,
endPosition + lastValueWrapper.LastEndPosition);
var ontail = endPosition >= TailInfo.TailStartsAt &&
DateTime.Now.Subtract(TailInfo.LastTail).TotalSeconds < 1
? DateTime.Now
: (DateTime?)null;
yield return(new Line(info, line, ontail));
lastValueWrapper.LastPageIndex = i + 1;
counter++;
lastEndPos = endPosition;
if (reader.EndOfStream)
{
lastValueWrapper.LastEndPosition += endPosition + 1;
lastValueWrapper.LastMatchesSize += current.Count;
break;
}
}
}
}
current = current.Next as FileSearchResult;
}
}