using System;
using System.Collections;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security;
using System.Security.Cryptography;
using System.Security.Policy;
using System.Security.Permissions;
using System.Text;
using System.Globalization;
using Microsoft.Win32;

namespace RomCheater.UserSettingsSupport
{
    public interface IIsolatedStoragePath
    {
        Assembly AssemblyInfo { get; }
        string ConfigFilePath { get; }
    }
    internal sealed class IsolatedStoragePath : IIsolatedStoragePath
    {
        const string EVIDENCE_STRONGNAME = "StrongName";
        const string EVIDENCE_URL = "Url";



        public IsolatedStoragePath() : this(false) { }
        public IsolatedStoragePath(bool UseCallingAssembly) : this(UseCallingAssembly ? Assembly.GetCallingAssembly() : Assembly.GetExecutingAssembly()) { }
        public IsolatedStoragePath(Assembly assembly) { CreatePath(assembly); }

        #region IIsolatedStorageHash Members
        private Assembly _AssemblyInfo;
        public Assembly AssemblyInfo { get { return _AssemblyInfo; } private set { _AssemblyInfo = value; } }

        private string _ConfigFilePath;
        public string ConfigFilePath { get { return _ConfigFilePath; } private set { _ConfigFilePath = value; } }
        #endregion


        private void CreatePath(Assembly asm)
        {
            this.AssemblyInfo = asm;
            this.ConfigFilePath = string.Empty;
            //string path = string.Empty;
            //string profile_dir = Environment.GetEnvironmentVariable("LocalAppData");
            //string company_name = ((AssemblyCompanyAttribute)Attribute.GetCustomAttribute(this.AssemblyInfo, typeof(AssemblyCompanyAttribute), false)).Company;
            //string app_fullname = new FileInfo(this.AssemblyInfo.Location).Name;
            //string evidence_type = this.AssemblyInfo.GetName().GetPublicKey().Length == 0 ? EVIDENCE_URL : EVIDENCE_STRONGNAME;
            //string evidence_hash = CompureEvidenceHashForAssembly(this.AssemblyInfo);
            //string version = this.AssemblyInfo.GetName().Version.ToString();
            //string config = "user.config";
            //StringBuilder builder = new StringBuilder();
            //builder.AppendFormat(@"{0}", profile_dir);
            //if (company_name != string.Empty)
            //{
            //    builder.AppendFormat(@"\{0}", company_name.Replace(" ", "_"));
            //}
            //builder.AppendFormat(@"\{0}", app_fullname);
            //builder.AppendFormat(@"_{0}", evidence_type);
            //builder.AppendFormat(@"_{0}", evidence_hash);
            //builder.AppendFormat(@"\{0}", version);
            //builder.AppendFormat(@"\{0}", config);
            //path = builder.ToString();
            //this.ConfigFilePath = path;


            //var asm_test = Assembly.LoadFile(this.AssemblyInfo.Location);

            ClientConfigPaths t = new ClientConfigPaths(this.AssemblyInfo, true);

            this.ConfigFilePath = t.LocalConfigFilename;

        }


        #region ClientConfigPaths
        class ClientConfigPaths
        {
            internal const string UserConfigFilename = "user.config";

            const string ClickOnceDataDirectory = "DataDirectory";
            const string ConfigExtension = ".config";
            const int MAX_PATH = 260;
            const int MAX_LENGTH_TO_USE = 25;
            const string FILE_URI_LOCAL = "file:///";
            const string FILE_URI_UNC = "file://";
            const string FILE_URI = "file:";
            const string HTTP_URI = "http://";
            const string StrongNameDesc = "StrongName";
            const string UrlDesc = "Url";
            const string PathDesc = "Path";

            static Char[] s_Base32Char = {
                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
                'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
                'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 
                'y', 'z', '0', '1', '2', '3', '4', '5'};

            //static volatile ClientConfigPaths s_current;
            //static volatile bool s_currentIncludesUserConfig;
            static SecurityPermission s_serializationPerm;
            static SecurityPermission s_controlEvidencePerm;

            //bool _hasEntryAssembly;
            //bool _includesUserConfig;
            //string _applicationUri;
            //string _applicationConfigUri;
            string _roamingConfigDirectory;
            string _roamingConfigFilename;
            string _localConfigDirectory;
            string _localConfigFilename;
            string _companyName;
            string _productName;
            string _productVersion;


            [FileIOPermission(SecurityAction.Assert, AllFiles = FileIOPermissionAccess.PathDiscovery | FileIOPermissionAccess.Read)]
            [SecurityPermission(SecurityAction.Assert, UnmanagedCode = true)]
            public ClientConfigPaths(Assembly assembly, bool includeUserConfig)
            {

                //_includesUserConfig = includeUserConfig;

                Assembly exeAssembly = assembly;
                //string applicationUri = null;
                //string applicationFilename = null;

                //// get the assembly and applicationUri for the file
                //if (exePath == null)
                //{
                //    // First check if a configuration file has been set for this app domain. If so, we will use that.
                //    // The CLR would already have normalized this, so no further processing necessary.
                //    //AppDomain domain = AppDomain.CurrentDomain;
                //    //AppDomainSetup setup = domain.SetupInformation;
                //    //_applicationConfigUri = setup.ConfigurationFile;

                //    // Now figure out the application path. 
                //    exeAssembly = Assembly.GetEntryAssembly();
                //    if (exeAssembly != null)
                //    {
                //        _hasEntryAssembly = true;
                //        applicationUri = exeAssembly.CodeBase;

                //        bool isFile = false;

                //        // If it is a local file URI, convert it to its filename, without invoking Uri class. 
                //        // example: "file:///C:/WINNT/Microsoft.NET/Framework/v2.0.x86fre/csc.exe" 
                //        if (StringUtil.StartsWithIgnoreCase(applicationUri, FILE_URI_LOCAL))
                //        {
                //            isFile = true;
                //            applicationUri = applicationUri.Substring(FILE_URI_LOCAL.Length);
                //        }
                //        // If it is a UNC file URI, convert it to its filename, without invoking Uri class.
                //        // example: "file://server/share/csc.exe" 
                //        else if (StringUtil.StartsWithIgnoreCase(applicationUri, FILE_URI_UNC))
                //        {
                //            isFile = true;
                //            applicationUri = applicationUri.Substring(FILE_URI.Length);
                //        }

                //        if (isFile)
                //        {
                //            applicationUri = applicationUri.Replace('/', '\\');
                //            applicationFilename = applicationUri;
                //        }
                //        else
                //        {
                //            applicationUri = exeAssembly.EscapedCodeBase;
                //        }
                //    }
                //    else
                //    {
                //        StringBuilder sb = new StringBuilder(MAX_PATH);
                //        UnsafeNativeMethods.GetModuleFileName(new HandleRef(null, IntPtr.Zero), sb, sb.Capacity);
                //        applicationUri = Path.GetFullPath(sb.ToString());
                //        applicationFilename = applicationUri;
                //    }
                //}
                ////else
                ////{
                ////    applicationUri = Path.GetFullPath(exePath);
                ////    if (!FileUtil.FileExists(applicationUri, false))
                ////        throw ExceptionUtil.ParameterInvalid("exePath");

                ////    applicationFilename = applicationUri;
                ////}

                //// Fallback if we haven't set the app config file path yet. 
                //if (_applicationConfigUri == null)
                //{
                //    _applicationConfigUri = applicationUri + ConfigExtension;
                //}

                //// Set application path
                //_applicationUri = applicationUri;

                //// In the case when exePath was explicitly supplied, we will not be able to
                //// construct user.config paths, so quit here. 
                //if (exePath != null)
                //{
                //    return;
                //}

                //// Skip expensive initialization of user config file information if requested.
                //if (!_includesUserConfig)
                //{
                //    return;
                //}

                ////bool isHttp = StringUtil.StartsWithIgnoreCase(_applicationConfigUri, HTTP_URI);

                //SetNamesAndVersion(applicationFilename, exeAssembly, false);
                SetNamesAndVersion(exeAssembly, false);

                //// Check if this is a clickonce deployed application. If so, point the user config
                //// files to the clickonce data directory.
                //if (this.IsClickOnceDeployed(AppDomain.CurrentDomain))
                //{
                //    string dataPath = AppDomain.CurrentDomain.GetData(ClickOnceDataDirectory) as string;
                //    string versionSuffix = Validate(_productVersion, false);

                //    // NOTE: No roaming config for clickonce - not supported.
                //    if (Path.IsPathRooted(dataPath))
                //    {
                //        _localConfigDirectory = CombineIfValid(dataPath, versionSuffix);
                //        _localConfigFilename = CombineIfValid(_localConfigDirectory, UserConfigFilename);
                //    }

                //}
                //else if (!isHttp)
                //{
                    // If we get the config from http, we do not have a roaming or local config directory, 
                    // as it cannot be edited by the app in those cases because it does not have Full Trust.

                    // suffix for user config paths

                    string part1 = Validate(_companyName, true);

                    //string validAppDomainName = Validate(AppDomain.CurrentDomain.FriendlyName, true);
                    string friendlyName = new FileInfo(exeAssembly.Location).Name;
                    string validAppDomainName = Validate(friendlyName, true);
                    //string applicationUriLower = !String.IsNullOrEmpty(_applicationUri) ? _applicationUri.ToLower(CultureInfo.InvariantCulture) : null;
                    string namePrefix = !String.IsNullOrEmpty(validAppDomainName) ? validAppDomainName : Validate(_productName, true);
                    //string hashSuffix = GetTypeAndHashSuffix(AppDomain.CurrentDomain, applicationUriLower);
                    //string hashSuffix = GetTypeAndHashSuffix(exeAssembly, applicationUriLower);
                    string hashSuffix = GetTypeAndHashSuffix(exeAssembly);

                    string part2 = (!String.IsNullOrEmpty(namePrefix) && !String.IsNullOrEmpty(hashSuffix)) ? namePrefix + hashSuffix : null;

                    string part3 = Validate(_productVersion, false);

                    string dirSuffix = CombineIfValid(CombineIfValid(part1, part2), part3);

                    string roamingFolderPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
                    if (Path.IsPathRooted(roamingFolderPath))
                    {
                        _roamingConfigDirectory = CombineIfValid(roamingFolderPath, dirSuffix);
                        _roamingConfigFilename = CombineIfValid(_roamingConfigDirectory, UserConfigFilename);
                    }

                    string localFolderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
                    if (Path.IsPathRooted(localFolderPath))
                    {
                        _localConfigDirectory = CombineIfValid(localFolderPath, dirSuffix);
                        _localConfigFilename = CombineIfValid(_localConfigDirectory, UserConfigFilename);
                    }
                //}
            }

            //internal static ClientConfigPaths GetPaths(string exePath, bool includeUserConfig)
            //{
            //    ClientConfigPaths result = null;

            //    if (exePath == null)
            //    {
            //        if (s_current == null || (includeUserConfig && !s_currentIncludesUserConfig))
            //        {
            //            s_current = new ClientConfigPaths(null, includeUserConfig);
            //            s_currentIncludesUserConfig = includeUserConfig;
            //        }

            //        result = s_current;
            //    }
            //    else
            //    {
            //        result = new ClientConfigPaths(exePath, includeUserConfig);
            //    }

            //    return result;
            //}

            //internal static void RefreshCurrent()
            //{
            //    s_currentIncludesUserConfig = false;
            //    s_current = null;
            //}

            //internal static ClientConfigPaths Current
            //{
            //    get
            //    {
            //        return GetPaths(null, true);
            //    }
            //}

            //internal bool HasEntryAssembly
            //{
            //    get
            //    {
            //        return _hasEntryAssembly;
            //    }
            //}

            //internal string ApplicationUri
            //{
            //    get
            //    {
            //        return _applicationUri;
            //    }
            //}

            //internal string ApplicationConfigUri
            //{
            //    get
            //    {
            //        return _applicationConfigUri;
            //    }
            //}

            internal string RoamingConfigFilename
            {
                get
                {
                    return _roamingConfigFilename;
                }
            }

            internal string RoamingConfigDirectory
            {
                get
                {
                    return _roamingConfigDirectory;
                }
            }

            //internal bool HasRoamingConfig
            //{
            //    get
            //    {
            //        // Assume we have roaming config if we haven't loaded user config file information.
            //        return RoamingConfigFilename != null || !_includesUserConfig;
            //    }
            //}

            internal string LocalConfigFilename
            {
                get
                {
                    return _localConfigFilename;
                }
            }

            internal string LocalConfigDirectory
            {
                get
                {
                    return _localConfigDirectory;
                }
            }

            //internal bool HasLocalConfig
            //{
            //    get
            //    {
            //        // Assume we have roaming config if we haven't loaded user config file information.
            //        return LocalConfigFilename != null || !_includesUserConfig;
            //    }
            //}

            internal string ProductName
            {
                get
                {
                    return _productName;
                }
            }

            internal string ProductVersion
            {
                get
                {
                    return _productVersion;
                }
            }

            private static SecurityPermission ControlEvidencePermission
            {
                get
                {
                    if (s_controlEvidencePerm == null)
                    {
                        s_controlEvidencePerm = new SecurityPermission(SecurityPermissionFlag.ControlEvidence);
                    }
                    return s_controlEvidencePerm;
                }
            }

            private static SecurityPermission SerializationFormatterPermission
            {
                get
                {
                    if (s_serializationPerm == null)
                    {
                        s_serializationPerm = new SecurityPermission(SecurityPermissionFlag.SerializationFormatter);
                    }
                    return s_serializationPerm;
                }
            }

            // Combines path2 with path1 if possible, else returns null.
            private string CombineIfValid(string path1, string path2)
            {
                string returnPath = null;

                if (path1 != null && path2 != null)
                {
                    try
                    {
                        string combinedPath = Path.Combine(path1, path2);
                        if (combinedPath.Length < MAX_PATH)
                        {
                            returnPath = combinedPath;
                        }
                    }
                    catch
                    {
                    }
                }

                return returnPath;
            }

            // Returns a type and hash suffix based on app domain evidence. The evidence we use, in
            // priority order, is Strong Name, Url and Exe Path. If one of these is found, we compute a
            // SHA1 hash of it and return a suffix based on that. If none is found, we return null.
            //private string GetTypeAndHashSuffix(AppDomain appDomain, string exePath)
            //private string GetTypeAndHashSuffix(Assembly appDomain, string exePath)
            private string GetTypeAndHashSuffix(Assembly appDomain)
            {
                string suffix = null;
                string typeName = null;
                object evidenceObj = null;
                //evidenceObj = GetEvidenceInfo(appDomain, exePath, out typeName);
                evidenceObj = GetEvidenceInfo(appDomain, out typeName);

                if (evidenceObj != null && !String.IsNullOrEmpty(typeName))
                {
                    MemoryStream ms = new MemoryStream();
                    BinaryFormatter bSer = new BinaryFormatter();
                    SerializationFormatterPermission.Assert();
                    bSer.Serialize(ms, evidenceObj);
                    ms.Position = 0;
                    string evidenceHash = GetHash(ms);

                    if (!String.IsNullOrEmpty(evidenceHash))
                    {
                        suffix = "_" + typeName + "_" + evidenceHash;
                    }
                }

                return suffix;
            }

            // Mostly borrowed from IsolatedStorage, with some modifications 
            //private static object GetEvidenceInfo(AppDomain appDomain, string exePath, out string typeName)
            //private static object GetEvidenceInfo(Assembly appDomain, string exePath, out string typeName)
            private static object GetEvidenceInfo(Assembly appDomain, out string typeName)
            {
                ControlEvidencePermission.Assert();
                Evidence evidence = appDomain.Evidence;
                StrongName sn = null;
                Url url = null;

                if (evidence != null)
                {
                    IEnumerator e = evidence.GetHostEnumerator();
                    object temp = null;

                    while (e.MoveNext())
                    {
                        temp = e.Current;

                        if (temp is StrongName)
                        {
                            sn = (StrongName)temp;
                            break;
                        }
                        else if (temp is Url)
                        {
                            url = (Url)temp;
                        }
                    }
                }

                object o = null;

                // The order of preference is StrongName, Url, ExePath.
                if (sn != null)
                {
                    o = MakeVersionIndependent(sn);
                    typeName = StrongNameDesc;
                }
                else if (url != null)
                {
                    // Extract the url string and normalize it to use as evidence
                    o = url.Value.ToUpperInvariant();
                    typeName = UrlDesc;
                }
                //else if (exePath != null)
                //{
                //    o = exePath;
                //    typeName = PathDesc;
                //}
                else
                {
                    typeName = null;
                }

                return o;
            }

            private static String GetHash(Stream s)
            {
                byte[] hash;

                using (SHA1 sha1 = new SHA1CryptoServiceProvider())
                {
                    hash = sha1.ComputeHash(s);
                }

                return ToBase32StringSuitableForDirName(hash);
            }

            private bool IsClickOnceDeployed(AppDomain appDomain)
            {
                // NOTE: For perf & servicing reasons, we don't want to introduce a dependency on 
                //       System.Deployment.dll here. The following code is an alternative to calling
                //       ApplicationDeployment.IsNetworkDeployed. 

                ActivationContext actCtx = appDomain.ActivationContext;

                // Ensures the app is running with a context from the store.
                if (actCtx != null && actCtx.Form == ActivationContext.ContextForm.StoreBounded)
                {
                    string fullAppId = actCtx.Identity.FullName;
                    if (!String.IsNullOrEmpty(fullAppId))
                    {
                        return true;
                    }
                }

                return false;
            }

            private static StrongName MakeVersionIndependent(StrongName sn)
            {
                return new StrongName(sn.PublicKey, sn.Name, new Version(0, 0, 0, 0));
            }

            //private void SetNamesAndVersion(string applicationFilename, Assembly exeAssembly, bool isHttp)
            private void SetNamesAndVersion(Assembly exeAssembly, bool isHttp)
            {
                Type mainType = null;

                //
                // Get CompanyName, ProductName, and ProductVersion
                // First try custom attributes on the assembly.
                // 
                if (exeAssembly != null)
                {
                    object[] attrs = exeAssembly.GetCustomAttributes(typeof(AssemblyCompanyAttribute), false);
                    if (attrs != null && attrs.Length > 0)
                    {
                        _companyName = ((AssemblyCompanyAttribute)attrs[0]).Company;
                        if (_companyName != null)
                        {
                            _companyName = _companyName.Trim();
                        }
                    }

                    attrs = exeAssembly.GetCustomAttributes(typeof(AssemblyProductAttribute), false);
                    if (attrs != null && attrs.Length > 0)
                    {
                        _productName = ((AssemblyProductAttribute)attrs[0]).Product;
                        if (_productName != null)
                        {
                            _productName = _productName.Trim();
                        }
                    }

                    _productVersion = exeAssembly.GetName().Version.ToString();
                    if (_productVersion != null)
                    {
                        _productVersion = _productVersion.Trim();
                    }
                }

                //
                // If we couldn't get custom attributes, try the Win32 file version
                //
                if (!isHttp && (String.IsNullOrEmpty(_companyName) || String.IsNullOrEmpty(_productName) || String.IsNullOrEmpty(_productVersion)))
                {
                    string versionInfoFileName = null;

                    if (exeAssembly != null)
                    {
                        MethodInfo entryPoint = exeAssembly.EntryPoint;
                        if (entryPoint != null)
                        {
                            mainType = entryPoint.ReflectedType;
                            if (mainType != null)
                            {
                                versionInfoFileName = mainType.Module.FullyQualifiedName;
                            }
                        }
                    }

                    //if (versionInfoFileName == null)
                    //{
                    //    versionInfoFileName = applicationFilename;
                    //}

                    if (versionInfoFileName != null)
                    {
                        System.Diagnostics.FileVersionInfo version = System.Diagnostics.FileVersionInfo.GetVersionInfo(versionInfoFileName);
                        if (version != null)
                        {
                            if (String.IsNullOrEmpty(_companyName))
                            {
                                _companyName = version.CompanyName;
                                if (_companyName != null)
                                {
                                    _companyName = _companyName.Trim();
                                }
                            }

                            if (String.IsNullOrEmpty(_productName))
                            {
                                _productName = version.ProductName;
                                if (_productName != null)
                                {
                                    _productName = _productName.Trim();
                                }
                            }

                            if (String.IsNullOrEmpty(_productVersion))
                            {
                                _productVersion = version.ProductVersion;
                                if (_productVersion != null)
                                {
                                    _productVersion = _productVersion.Trim();
                                }
                            }
                        }
                    }
                }

                if (String.IsNullOrEmpty(_companyName) || String.IsNullOrEmpty(_productName))
                {
                    string ns = null;
                    if (mainType != null)
                    {
                        ns = mainType.Namespace;
                    }

                    // Desperate measures for product name 
                    if (String.IsNullOrEmpty(_productName))
                    {
                        // Try the remainder of the namespace
                        if (ns != null)
                        {
                            int lastDot = ns.LastIndexOf(".", StringComparison.Ordinal);
                            if (lastDot != -1 && lastDot < ns.Length - 1)
                            {
                                _productName = ns.Substring(lastDot + 1);
                            }
                            else
                            {
                                _productName = ns;
                            }

                            _productName = _productName.Trim();
                        }

                        // Try the type of the entry assembly 
                        if (String.IsNullOrEmpty(_productName) && mainType != null)
                        {
                            _productName = mainType.Name.Trim();
                        }

                        // give up, return empty string
                        if (_productName == null)
                        {
                            _productName = string.Empty;
                        }
                    }

                    // Desperate measures for company name
                    if (String.IsNullOrEmpty(_companyName))
                    {
                        // Try the first part of the namespace
                        if (ns != null)
                        {
                            int firstDot = ns.IndexOf(".", StringComparison.Ordinal);
                            if (firstDot != -1)
                            {
                                _companyName = ns.Substring(0, firstDot);
                            }
                            else
                            {
                                _companyName = ns;
                            }

                            _companyName = _companyName.Trim();
                        }

                        // If that doesn't work, use the product name
                        if (String.IsNullOrEmpty(_companyName))
                        {
                            _companyName = _productName;
                        }
                    }
                }

                // Desperate measures for product version - assume 1.0
                if (String.IsNullOrEmpty(_productVersion))
                {
                    _productVersion = "1.0.0.0";
                }
            }

            // Borrowed from IsolatedStorage 
            private static string ToBase32StringSuitableForDirName(byte[] buff)
            {
                StringBuilder sb = new StringBuilder();
                byte b0, b1, b2, b3, b4;
                int l, i;

                l = buff.Length;
                i = 0;

                // Create l chars using the last 5 bits of each byte. 
                // Consume 3 MSB bits 5 bytes at a time.

                do
                {
                    b0 = (i < l) ? buff[i++] : (byte)0;
                    b1 = (i < l) ? buff[i++] : (byte)0;
                    b2 = (i < l) ? buff[i++] : (byte)0;
                    b3 = (i < l) ? buff[i++] : (byte)0;
                    b4 = (i < l) ? buff[i++] : (byte)0;

                    // Consume the 5 Least significant bits of each byte
                    sb.Append(s_Base32Char[b0 & 0x1F]);
                    sb.Append(s_Base32Char[b1 & 0x1F]);
                    sb.Append(s_Base32Char[b2 & 0x1F]);
                    sb.Append(s_Base32Char[b3 & 0x1F]);
                    sb.Append(s_Base32Char[b4 & 0x1F]);

                    // Consume 3 MSB of b0, b1, MSB bits 6, 7 of b3, b4 
                    sb.Append(s_Base32Char[(
                            ((b0 & 0xE0) >> 5) |
                            ((b3 & 0x60) >> 2))]);

                    sb.Append(s_Base32Char[(
                            ((b1 & 0xE0) >> 5) |
                            ((b4 & 0x60) >> 2))]);

                    // Consume 3 MSB bits of b2, 1 MSB bit of b3, b4 

                    b2 >>= 5;

                    if ((b3 & 0x80) != 0)
                        b2 |= 0x08;
                    if ((b4 & 0x80) != 0)
                        b2 |= 0x10;

                    sb.Append(s_Base32Char[b2]);

                } while (i < l);

                return sb.ToString();
            }

            // Makes the passed in string suitable to use as a path name by replacing illegal characters 
            // with underscores. Additionally, we do two things - replace spaces too with underscores and
            // limit the resultant string's length to MAX_LENGTH_TO_USE if limitSize is true. 
            private string Validate(string str, bool limitSize)
            {
                string validated = str;

                if (!String.IsNullOrEmpty(validated))
                {
                    // First replace all illegal characters with underscores
                    foreach (char c in Path.GetInvalidFileNameChars())
                    {
                        validated = validated.Replace(c, '_');
                    }

                    // Replace all spaces with underscores
                    validated = validated.Replace(' ', '_');

                    if (limitSize)
                    {
                        validated = (validated.Length > MAX_LENGTH_TO_USE) ? validated.Substring(0, MAX_LENGTH_TO_USE) : validated;
                    }
                }

                return validated;
            }
        }
        #endregion
    }
}