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FileStreamExtensions.cs
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FileStreamExtensions.cs
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using J2N.IO;
using System.IO;
namespace Lucene.Net.Support.IO
{
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
public static class FileStreamExtensions
{
private static object _fsReadLock = new object();
//Reads bytes from the Filestream into the bytebuffer
public static int Read(this FileStream file, ByteBuffer dst, long position)
{
lock (_fsReadLock)
{
// TODO: check this logic, could probably optimize
if (position >= file.Length)
return 0;
var original = file.Position;
file.Seek(position, SeekOrigin.Begin);
int count = 0;
for (int i = dst.Position; i < dst.Limit; i++)
{
int v = file.ReadByte();
if (v == -1)
break;
dst.Put((byte) v);
count++;
}
file.Seek(original, SeekOrigin.Begin);
return count;
}
}
}
}