root / trunk / Pithos.Core / Agents / FileInfoExtensions.cs @ b9f5b594
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// ----------------------------------------------------------------------- |
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// <copyright file="FileInfoExtensions.cs" company="GRNET"> |
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// Copyright 2011 GRNET S.A. All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or |
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// without modification, are permitted provided that the following |
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// conditions are met: |
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// |
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// 1. Redistributions of source code must retain the above |
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// copyright notice, this list of conditions and the following |
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// disclaimer. |
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// |
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// 2. Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following |
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// disclaimer in the documentation and/or other materials |
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// provided with the distribution. |
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// |
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// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS |
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// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR |
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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// POSSIBILITY OF SUCH DAMAGE. |
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// |
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// The views and conclusions contained in the software and |
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// documentation are those of the authors and should not be |
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// interpreted as representing official policies, either expressed |
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// or implied, of GRNET S.A. |
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// </copyright> |
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// ----------------------------------------------------------------------- |
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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics.Contracts; |
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using System.Linq; |
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using System.Text; |
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using System.IO; |
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using System.Text.RegularExpressions; |
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using System.Threading.Tasks; |
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using Pithos.Network; |
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|
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namespace Pithos.Core.Agents |
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{ |
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static class FileInfoExtensions |
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{ |
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|
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|
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public static int Read(this FileInfo fileInfo,byte[] buffer,int offset,int count) |
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{ |
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//Open the stream only long enough to read a block |
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using (var stream = fileInfo.OpenRead()) |
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{ |
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stream.Seek(offset, SeekOrigin.Begin); |
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return stream.Read(buffer, 0, count); |
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} |
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} |
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|
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public static string CalculateHash(this FileSystemInfo info,int blockSize,string algorithm) |
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{ |
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if (info==null) |
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throw new ArgumentNullException("info"); |
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if (String.IsNullOrWhiteSpace(info.FullName)) |
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throw new ArgumentException("info"); |
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if (blockSize<=0) |
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throw new ArgumentOutOfRangeException("blockSize",blockSize,"blockSize must be greater than 0"); |
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if (String.IsNullOrWhiteSpace(algorithm)) |
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throw new ArgumentNullException("algorithm"); |
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Contract.EndContractBlock(); |
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|
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//The hash for directories is an empty string |
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if (info is DirectoryInfo) |
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return String.Empty; |
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|
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var fileInfo = (FileInfo)info; |
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if (fileInfo.Length <= blockSize) |
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return Signature.CalculateMD5(info.FullName); |
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else |
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return Signature.CalculateTreeHash(info.FullName, blockSize, algorithm).TopHash.ToHashString(); |
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|
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} |
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} |
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} |