1 // -----------------------------------------------------------------------
2 // <copyright file="FileInfoExtensions.cs" company="GRNET">
3 // Copyright 2011-2012 GRNET S.A. All rights reserved.
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36 // -----------------------------------------------------------------------
40 using System.Collections.Generic;
41 using System.Diagnostics.Contracts;
45 using System.Text.RegularExpressions;
46 using System.Threading.Tasks;
49 namespace Pithos.Core.Agents
51 static class BlockExtensions
55 public static int Read(this FileInfo fileInfo,byte[] buffer,int offset,int count)
57 //Open the stream only long enough to read a block
58 using (var stream = fileInfo.OpenRead())
60 stream.Seek(offset, SeekOrigin.Begin);
61 return stream.Read(buffer, 0, count);
65 public static string CalculateHash(this FileSystemInfo info,int blockSize,string algorithm)
68 throw new ArgumentNullException("info");
69 if (String.IsNullOrWhiteSpace(info.FullName))
70 throw new ArgumentException("info");
72 throw new ArgumentOutOfRangeException("blockSize",blockSize,"blockSize must be greater than 0");
73 if (String.IsNullOrWhiteSpace(algorithm))
74 throw new ArgumentNullException("algorithm");
75 Contract.EndContractBlock();
77 //The hash for directories is an empty string
78 if (info is DirectoryInfo)
80 //The hash for non-existent files is an empty string
84 var fileInfo = (FileInfo)info;
85 if (fileInfo.Length <= blockSize)
86 return Signature.CalculateMD5(info.FullName);
88 return Signature.CalculateTreeHash(info.FullName, blockSize, algorithm).TopHash.ToHashString();