Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.Diagnostics.Contracts;

using System.Linq;

using System.Text;

using System.IO;

using System.Text.RegularExpressions;

using System.Threading.Tasks;

using Pithos.Network;

namespace Pithos.Core.Agents

{

    static class FileInfoExtensions

    {

        public static int Read(this FileInfo fileInfo,byte[] buffer,int offset,int count)

        {            

            //Open the stream only long enough to read a block

            using (var stream = fileInfo.OpenRead())

            {

                stream.Seek(offset, SeekOrigin.Begin);

                return  stream.Read(buffer, 0, count);                

            }

        }

       public static string CalculateHash(this FileSystemInfo info,int blockSize,string algorithm)

        {

            if (info==null)

                throw new ArgumentNullException("info");

            if (String.IsNullOrWhiteSpace(info.FullName))

                throw new ArgumentException("info");

            if (blockSize<=0)

                throw new ArgumentOutOfRangeException("blockSize",blockSize,"blockSize must be greater than 0");

            if (String.IsNullOrWhiteSpace(algorithm))

                throw new ArgumentNullException("algorithm");

            Contract.EndContractBlock();

           //The hash for directories is an empty string

           if (info is DirectoryInfo)

                return String.Empty;

           var fileInfo = (FileInfo)info;

           if (fileInfo.Length <= blockSize)

                return Signature.CalculateMD5(info.FullName);

            else

                return Signature.CalculateTreeHash(info.FullName, blockSize, algorithm).TopHash.ToHashString();

        }

    }

}