iNodesFileSystemSimulation/Tanenbaum_4_48/FileSystem.cs at master · Forichok/iNodesFileSystemSimulation · GitHub

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using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

namespace Tanenbaum_4_48

{

internal sealed class FileSystem

{

private int _inodesCount;

private int _freeBlocks;

private int _freeInodes;

private int _blocksCount;

private static int _blockSize = 128000;

public static int _inodeSize { get; set; } = 2048;

private readonly int _superBlockSize = 4096;

private List<int> freeBlocksList;

private int _currentDirectoryNode;

private readonly string _path;

private readonly object _fileLock = new object();

public FileSystem(string path, int inodesCount = 50, int blocksCount = 5000)

{

if (_superBlockSize <= blocksCount * 5)

{

_superBlockSize = blocksCount * 5 + 256;

}

_currentDirectoryNode = 1;

_path = path;

_freeInodes = inodesCount;

_freeBlocks = blocksCount;

_inodesCount = inodesCount;

_blocksCount = blocksCount;

freeBlocksList= new List<int>();

for (var i = 0; i < blocksCount; i++)

{

freeBlocksList.Add(_inodesCount+i+1);

}

private void OverWriteSuperBlock()

{

string superBlock = null;

superBlock += $"Inodes Count : {_inodesCount}".PadRight(31) + '\n';

superBlock += $"Data Blocks Count : {_blocksCount}".PadRight(31) + '\n';

superBlock += $"Free Inodes : {_freeInodes}".PadRight(31) + '\n';

superBlock += $"Free Blocks : {_freeBlocks}".PadRight(31) + '\n';

superBlock += $"Inode Size : {_inodeSize}".PadRight(31) + '\n';

superBlock += $"Block Size : {_blockSize}".PadRight(31) + '\n';

freeBlocksList.Sort();

superBlock += $"Free Blocks : {string.Join(" ", freeBlocksList)}"+'\n';

superBlock = superBlock.PadRight(_superBlockSize-1, '=') + '\n';

var rootNodeInfo = Encoding.ASCII.GetBytes(superBlock);

lock (_fileLock)

{

using (var sr = new FileStream(_path, FileMode.Open))

{

sr.Seek(0, SeekOrigin.Begin);

sr.Write(rootNodeInfo, 0, rootNodeInfo.Length);

}

private INode ReadNode(int id)

{

var nodeInfo = new byte[_inodeSize];

lock (_fileLock)

{

using (var sr = new FileStream(_path, FileMode.Open))

{

sr.Seek(_superBlockSize + (id - 1) * _inodeSize, SeekOrigin.Begin);

sr.Read(nodeInfo, 0, _inodeSize);

}

var str = Encoding.Default.GetString(nodeInfo);

var inode = INode.GetNode(str);

return inode;

}

private DataBlock ReadBlock(int id)

{

var blockInfo = new byte[_blockSize];

lock (_fileLock)

{

using (var sr = new FileStream(_path, FileMode.Open))

{

var offset = _superBlockSize + _inodeSize * _inodesCount + (id - 1) * _blockSize;

sr.Seek(offset, SeekOrigin.Begin);

sr.Read(blockInfo, 0, blockInfo.Length);

}

var str = Encoding.Default.GetString(blockInfo);

var a = str.Split('\n').ToList();

a.Remove(a.First());

var isFree = a.First().Contains("free");

a.Remove(a.First());

var b = new DataBlock(_inodesCount + id, _blockSize, string.Join("\n", a).Trim('*'), isFree);

return b;

}

public void ReadSuperBlock()

{

var superBlock = new char[_superBlockSize];

lock (_fileLock)

{

using (var sr = new StreamReader(_path))

{

sr.ReadBlock(superBlock, 0, _superBlockSize);

}

var lines = string.Join("", superBlock).Split('\n').Select(s => s.Trim(' ', '=')).Except(new[] {""}).ToList();

try

{

var values = lines.Select(s =>s.Split(new[] {" : "}, StringSplitOptions.RemoveEmptyEntries)[1]).ToList();

_inodesCount = Convert.ToInt32(values[0]);

_blocksCount = Convert.ToInt32(values[1]);

_freeInodes = Convert.ToInt32(values[2]);

_freeBlocks = Convert.ToInt32(values[3]);

_inodeSize = Convert.ToInt32(values[4]);

_blockSize = Convert.ToInt32(values[5]);

}

catch (Exception e)

{

Console.WriteLine("Incorrect File :(" + e);

}

private void WriteRootNode()

{

var name = System.Security.Principal.WindowsIdentity.GetCurrent().Name.Split('\\')[1];

var rootNode = new INode(1, "Directory", "777", 1, name, "Users", _blockSize, DateTime.Now,

new List<int>() {_inodesCount + 1});

OverWriteNode(rootNode);

_freeBlocks--;

_freeInodes--;

OverWriteSuperBlock();

}

private void OverWriteNode(INode iNode)

{

var rootNodeInfo = Encoding.ASCII.GetBytes(iNode.ToString());

lock (_fileLock)

{

using (var sr = new FileStream(_path, FileMode.Open))

{

sr.Seek(_superBlockSize + (iNode.Id - 1) * _inodeSize, SeekOrigin.Begin);

sr.Write(rootNodeInfo, 0, rootNodeInfo.Length);

}

private void OverWriteBlock(DataBlock dataBlock)

{

var blockInfo = Encoding.ASCII.GetBytes(dataBlock.ToString());

lock (_fileLock)

{

using (var sr = new FileStream(_path, FileMode.Open))

{

var offset = _superBlockSize + _inodeSize * _inodesCount + (dataBlock.Id - _inodesCount - 1) * _blockSize;

sr.Seek(offset, SeekOrigin.Begin);

sr.Write(blockInfo, 0, blockInfo.Length);

}

public void GenerateFreeFileSystem()

{

lock (_fileLock)

{

File.WriteAllText(_path, String.Empty);

}

OverWriteSuperBlock();

WriteRootNode();

for (var i = 1; i < _inodesCount; i++)

{

OverWriteNode(INode.GetEmptyNode(i + 1, 0));

}

var block = new DataBlock(_inodesCount + 1, _blockSize, ". | 1\n.. | 1\n", false);

OverWriteBlock(block);

freeBlocksList.Remove(block.Id);

//for (var i = 1; i < _blocksCount; i++)

//{

// OverWriteBlock(DataBlock.GetEmptyDatablock(i + 1 + _inodesCount, _blockSize));

//}

}

public void GoToDirectory(string name)

{

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var nodeId = block.GetNodeId(name);

if (nodeId != 0)

{

if (ReadNode(nodeId).Type != "Directory")

{

Console.WriteLine("Directory with this Fullname not found. :(");

return;

}

if (nodeId == 0)

{

Console.WriteLine("Directory with this Fullname not found. :(");

return;

}

_currentDirectoryNode = nodeId;

}

private INode GetFreeNode()

{

INode freeNode = null;

for (var i = 0; i < _inodesCount; i++)

{

var iNode = ReadNode(i + 1);

if (iNode.DataBlocks.Count != 0) continue;

freeNode = iNode;

break;

}

return freeNode;

}

public void MakeDirectory(string name)

{

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var nodeId = block.GetNodeId(name);

if (nodeId != 0)

{

if (ReadNode(nodeId).Type == "Directory")

{

Console.WriteLine("Directory Already Exists");

return;

}

var freeNode = GetFreeNode();

if (freeNode == null)

{

Console.WriteLine("THERE IS NO FREE SPACE SRY");

return;

}

for (var i = 0; i < _blocksCount; i++)

{

if (freeBlocksList.Count==0) continue;

var freeBlock = new DataBlock(freeBlocksList.First(), _blockSize, $". | {freeNode.Id}\n.. | {node.Id}\n", false);

freeBlocksList.Remove(freeBlock.Id);

block.Add(freeNode.Id, name);

freeNode.AddDataBlock(freeBlock.Id);

freeNode.User = System.Security.Principal.WindowsIdentity.GetCurrent().Name.Split('\\')[1];

freeNode.Type = "Directory";

freeNode.LinkCount++;

freeNode.Size += _blockSize;

freeNode.TimeStamp = DateTime.Now;

freeNode.Group = "Users";

freeNode.Mode = "777";

node.LinkCount++;

_freeBlocks--;

_freeInodes--;

OverWriteBlock(freeBlock);

OverWriteNode(node);

OverWriteBlock(block);

OverWriteNode(freeNode);

OverWriteSuperBlock();

return;

}

private byte[] ReadFile(string fullname)

{

var output = string.Empty;

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

string fileName;

string fileExtention;

try

{

fileName = fullname.Split('.')[0];

fileExtention = '.' + fullname.Split('.')[1];

}

catch (Exception e)

{

Console.WriteLine(e);

return new byte[] { };

}

var nodeId = block.GetNodeId(fileName);

if (nodeId != 0)

{

var curNode = ReadNode(nodeId);

if (curNode.Type == fileExtention)

{

foreach (var dataBlockId in curNode.DataBlocks)

{

var newdata = ReadBlock(dataBlockId - _inodesCount).GetData();

output += newdata;

}

var splited = output.Split(' ').ToList();

var bytes = new List<byte>();

foreach (var item in splited)

{

if (item.Length != 0)

bytes.Add(Convert.ToByte(item));

}

return bytes.ToArray();

}

public void AddTxtFile(string name, string data)

{

var bytes = Encoding.Default.GetBytes(data);

AddFile(name, bytes);

}

public void AddFile(string fullname, byte[] bytes)

{

string fileName;

string fileExtention;

try

{

fileName = fullname.Split('.')[0];

fileExtention = '.' + fullname.Split('.')[1];

}

catch (Exception e)

{

Console.WriteLine(e);

return;

}

var str = string.Join(" ", bytes);

var infoBlocks = SplitByLength(str, _blockSize - 36).ToList();

//var freeBlocks = new List<DataBlock>();

var freeNode = GetFreeNode();

//for (var i = 0; i < _blocksCount; i++)

//{

// var block = ReadBlock(i + 1);

// if (block.IsFree)

// {

// freeBlocks.Add(block);

// }

//}

if (freeBlocksList.Count >= infoBlocks.Count && freeNode!=null)

{

_freeInodes--;

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var datasize = 0;

block.Add(freeNode.Id, fileName);

OverWriteBlock(block);

for (var i = 0; i < infoBlocks.Count; i++)

{

datasize += infoBlocks[i].Length;

var bl = new DataBlock(freeBlocksList[i], _blockSize, infoBlocks[i], false);

freeBlocksList.Remove(bl.Id);

_freeBlocks--;

OverWriteBlock(bl);

freeNode.AddDataBlock(bl.Id);

}

freeNode.User = System.Security.Principal.WindowsIdentity.GetCurrent().Name.Split('\\')[1];

freeNode.Type = fileExtention;

freeNode.LinkCount++;

freeNode.Size = datasize;

freeNode.TimeStamp = DateTime.Now;

freeNode.Group = "Users";

freeNode.Mode = "777";

OverWriteNode(freeNode);

OverWriteSuperBlock();

}

else

{

Console.WriteLine("Not Enough Space");

}

private static IEnumerable<string> SplitByLength(string str, int maxLength)

{

for (var index = 0; index < str.Length; index += maxLength)

{

yield return str.Substring(index, Math.Min(maxLength, str.Length - index));

}

public void RemoveDirectory(string name)

{

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var nodeId = block.GetNodeId(name);

if (nodeId != 0)

{

if (ReadNode(nodeId).Type == "Directory")

{

block.Remove(name, nodeId);

OverWriteBlock(block);

ClearInode(nodeId);

}

else

{

Console.WriteLine("Directory not found. ");

}

else

{

Console.WriteLine("Directory not found. :(");

}

public void RemoveFile(string fullName)

{

var node = ReadNode(_currentDirectoryNode);

var fileName = fullName.Split('.')[0];

var fileExtention = '.' + fullName.Split('.')[1];

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var nodeId = block.GetNodeId(fileName);

if (nodeId != 0)

{

if (ReadNode(nodeId).Type.Trim() == fileExtention.Trim())

{

block.Remove(fileName, nodeId);

OverWriteBlock(block);

ClearInode(nodeId);

}

else

{

Console.WriteLine("File not found. ");

}

else

{

Console.WriteLine("File not found. :(");

}

private void ClearInode(int nodeId)

{

var node = ReadNode(nodeId);

foreach (var item in node.DataBlocks)

{

var block = ReadBlock(item - _inodesCount);

var directoryInfo = block.GetDirectoryInfo();

var freeBlock = new DataBlock(block.Id, _blockSize, "");

_freeBlocks++;

OverWriteBlock(freeBlock);

freeBlocksList.Add(freeBlock.Id);

foreach (var info in directoryInfo)

{

if (info.Key.Contains('.'))

continue;

ClearInode(info.Value);

var freeNode = INode.GetEmptyNode(info.Value, 0);

_freeInodes++;

OverWriteNode(freeNode);

}

node = INode.GetEmptyNode(node.Id, 0);

_freeInodes++;

OverWriteNode(node);

OverWriteSuperBlock();

}

public void ShowDirectoryInfo()

{

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

var directories = block.GetDirectoryInfo();

foreach (var item in directories)

{

// if(item.Key.Contains('.'))

// continue;

var output = String.Empty;

var curNode = ReadNode(item.Value);

output += curNode.Mode + " ";

output += curNode.LinkCount;

output = output.PadRight(10);

output += curNode.User;

output = output.PadRight(20);

output += curNode.Group;

output = output.PadRight(30);

output += curNode.Size;

output = output.PadRight(40);

output += curNode.TimeStamp + " ";

output += item.Key;

if (curNode.Type != "Directory")

output = output.TrimEnd() + curNode.Type.Trim();

Console.WriteLine(output);

}

public void GoToPreviousDirectory()

{

var node = ReadNode(_currentDirectoryNode);

var block = ReadBlock(node.DataBlocks.First() - _inodesCount);

foreach (var item in block.GetDirectoryInfo())

{

if (item.Key.Trim() == "..")

{

_currentDirectoryNode = item.Value;

}

public void SaveAs(string newPath,string name)

{

var desctopPath =newPath + '\\' + name;

File.WriteAllBytes(desctopPath, ReadFile(name));

}

public void SaveToPc(string name)

{

var desctopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + '\\' +

"Tanenbaum_4_48" + '\\' + name;

File.WriteAllBytes(desctopPath, ReadFile(name));

}

public string GetFileInfo(string name)

{

var a = ReadFile(name);

var str = Encoding.Default.GetString(a.ToArray());

return str;

}

iNodesFileSystemSimulation/Tanenbaum_4_48/FileSystem.cs at master · Forichok/iNodesFileSystemSimulation · GitHub

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