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faster text checking

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This commit is contained in:
Paddy Xu
2017-07-30 23:35:52 +03:00
parent 41aa42d897
commit c97f932bc3
1 changed files with 14 additions and 6 deletions
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20
QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs
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@@ -18,7 +18,6 @@
using System.IO; using System.IO;
using System.Windows; using System.Windows;
using ICSharpCode.AvalonEdit.Highlighting; using ICSharpCode.AvalonEdit.Highlighting;
using UtfUnknown;
namespace QuickLook.Plugin.TextViewer namespace QuickLook.Plugin.TextViewer
{ {
@@ -47,14 +46,14 @@ namespace QuickLook.Plugin.TextViewer
if (HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(path)) != null) if (HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(path)) != null)
return new FileInfo(path).Length <= MAX_SIZE; return new FileInfo(path).Length <= MAX_SIZE;
// otherwise, read the first 10KB, check if we can get something. // otherwise, read the first 512KB, check if we can get something.
using (var s = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) using (var s = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{ {
const int bufferLength = 10 * 1024; const int bufferLength = 512 * 1024;
var buffer = new byte[bufferLength]; var buffer = new byte[bufferLength];
s.Read(buffer, 0, bufferLength); var size = s.Read(buffer, 0, bufferLength);
return CharsetDetector.DetectFromBytes(buffer).Detected != null && s.Length <= MAX_SIZE; return IsText(buffer, size) && new FileInfo(path).Length <= MAX_SIZE;
} }
} }
@@ -78,5 +77,14 @@ namespace QuickLook.Plugin.TextViewer
{ {
_tvp.viewer = null; _tvp.viewer = null;
} }
private bool IsText(byte[] buffer, int size)
{
for (var i = 1; i < size; i++)
if (buffer[i - 1] == 0 && buffer[i] == 0)
return false;
return true;
}
} }
} }