Where possible, use the system Encoding.ASCII and Encoding.UTF8 rather than constructing fresh copies.

The encodings are thread-safe and already used in such a manner in other places.
This isn't done where Byte Order Mark output is suppressed, since Encoding.UTF8 is constructed to output the BOM.

OpenSim/ConsoleClient/Requester.cs

@@ -50,7 +50,7 @@ namespace OpenSim.ConsoleClient
 
             request.ContentType = "application/x-www-form-urlencoded";
 
-            byte[] buffer = new System.Text.ASCIIEncoding().GetBytes(data);
+            byte[] buffer = Encoding.ASCII.GetBytes(data);
             int length = (int) buffer.Length;
             request.ContentLength = length;
 

OpenSim/Framework/Serialization/External/LandDataSerializer.cs

@@ -44,8 +44,6 @@ namespace OpenSim.Framework.Serialization.External
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
-        protected static UTF8Encoding m_utf8Encoding = new UTF8Encoding();
-
         private static Dictionary<string, Action<LandData, XmlTextReader>> m_ldProcessors
             = new Dictionary<string, Action<LandData, XmlTextReader>>();
 
@@ -163,7 +161,7 @@ namespace OpenSim.Framework.Serialization.External
         /// <exception cref="System.Xml.XmlException"></exception>
         public static LandData Deserialize(byte[] serializedLandData)
         {
-            return Deserialize(m_utf8Encoding.GetString(serializedLandData, 0, serializedLandData.Length));
+            return Deserialize(Encoding.UTF8.GetString(serializedLandData, 0, serializedLandData.Length));
         }
 
         /// <summary>

OpenSim/Framework/Serialization/External/RegionSettingsSerializer.cs

@@ -38,8 +38,6 @@ namespace OpenSim.Framework.Serialization.External
     /// </summary>
     public class RegionSettingsSerializer
     {
-        protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
-        
         /// <summary>
         /// Deserialize settings
         /// </summary>
@@ -48,7 +46,7 @@ namespace OpenSim.Framework.Serialization.External
         /// <exception cref="System.Xml.XmlException"></exception>
         public static RegionSettings Deserialize(byte[] serializedSettings)
         {
-            return Deserialize(m_asciiEncoding.GetString(serializedSettings, 0, serializedSettings.Length));
+            return Deserialize(Encoding.ASCII.GetString(serializedSettings, 0, serializedSettings.Length));
         }
         
         /// <summary>

OpenSim/Framework/Serialization/TarArchiveReader.cs

@@ -53,8 +53,6 @@ namespace OpenSim.Framework.Serialization
             TYPE_CONTIGUOUS_FILE = 8,
         }
 
-        protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
-
         /// <summary>
         /// Binary reader for the underlying stream
         /// </summary>
@@ -120,13 +118,13 @@ namespace OpenSim.Framework.Serialization
             if (header[156] == (byte)'L')
             {
                 int longNameLength = ConvertOctalBytesToDecimal(header, 124, 11);
-                tarHeader.FilePath = m_asciiEncoding.GetString(ReadData(longNameLength));
+                tarHeader.FilePath = Encoding.ASCII.GetString(ReadData(longNameLength));
                 //m_log.DebugFormat("[TAR ARCHIVE READER]: Got long file name {0}", tarHeader.FilePath);
                 header = m_br.ReadBytes(512);
             }
             else
             {
-                tarHeader.FilePath = m_asciiEncoding.GetString(header, 0, 100);
+                tarHeader.FilePath = Encoding.ASCII.GetString(header, 0, 100);
                 tarHeader.FilePath = tarHeader.FilePath.Trim(m_nullCharArray);
                 //m_log.DebugFormat("[TAR ARCHIVE READER]: Got short file name {0}", tarHeader.FilePath);
             }
@@ -205,7 +203,7 @@ namespace OpenSim.Framework.Serialization
         {
             // Trim leading white space: ancient tars do that instead
             // of leading 0s :-( don't ask. really.
-            string oString = m_asciiEncoding.GetString(bytes, startIndex, count).TrimStart(m_spaceCharArray);
+            string oString = Encoding.ASCII.GetString(bytes, startIndex, count).TrimStart(m_spaceCharArray);
 
             int d = 0;
 

OpenSim/Framework/Serialization/TarArchiveWriter.cs

@@ -41,7 +41,6 @@ namespace OpenSim.Framework.Serialization
     {
 //        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
-        protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
         protected static UTF8Encoding m_utf8Encoding = new UTF8Encoding();
 
         /// <summary>
@@ -85,7 +84,7 @@ namespace OpenSim.Framework.Serialization
         public void WriteFile(string filePath, byte[] data)
         {
             if (filePath.Length > 100)
-                WriteEntry("././@LongLink", m_asciiEncoding.GetBytes(filePath), 'L');
+                WriteEntry("././@LongLink", Encoding.ASCII.GetBytes(filePath), 'L');
 
             char fileType;
 
@@ -137,7 +136,7 @@ namespace OpenSim.Framework.Serialization
                 oString = "0" + oString;
             }
 
-            byte[] oBytes = m_asciiEncoding.GetBytes(oString);
+            byte[] oBytes = Encoding.ASCII.GetBytes(oString);
 
             return oBytes;
         }
@@ -156,20 +155,20 @@ namespace OpenSim.Framework.Serialization
             byte[] header = new byte[512];
 
             // file path field (100)
-            byte[] nameBytes = m_asciiEncoding.GetBytes(filePath);
+            byte[] nameBytes = Encoding.ASCII.GetBytes(filePath);
             int nameSize = (nameBytes.Length >= 100) ? 100 : nameBytes.Length;
             Array.Copy(nameBytes, header, nameSize);
 
             // file mode (8)
-            byte[] modeBytes = m_asciiEncoding.GetBytes("0000777");
+            byte[] modeBytes = Encoding.ASCII.GetBytes("0000777");
             Array.Copy(modeBytes, 0, header, 100, 7);
 
             // owner user id (8)
-            byte[] ownerIdBytes = m_asciiEncoding.GetBytes("0000764");
+            byte[] ownerIdBytes = Encoding.ASCII.GetBytes("0000764");
             Array.Copy(ownerIdBytes, 0, header, 108, 7);
 
             // group user id (8)
-            byte[] groupIdBytes = m_asciiEncoding.GetBytes("0000764");
+            byte[] groupIdBytes = Encoding.ASCII.GetBytes("0000764");
             Array.Copy(groupIdBytes, 0, header, 116, 7);
 
             // file size in bytes (12)
@@ -181,17 +180,17 @@ namespace OpenSim.Framework.Serialization
             Array.Copy(fileSizeBytes, 0, header, 124, 11);
 
             // last modification time (12)
-            byte[] lastModTimeBytes = m_asciiEncoding.GetBytes("11017037332");
+            byte[] lastModTimeBytes = Encoding.ASCII.GetBytes("11017037332");
             Array.Copy(lastModTimeBytes, 0, header, 136, 11);
 
             // entry type indicator (1)
-            header[156] = m_asciiEncoding.GetBytes(new char[] { fileType })[0];
+            header[156] = Encoding.ASCII.GetBytes(new char[] { fileType })[0];
 
-            Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 329, 7);
+            Array.Copy(Encoding.ASCII.GetBytes("0000000"), 0, header, 329, 7);
-            Array.Copy(m_asciiEncoding.GetBytes("0000000"), 0, header, 337, 7);
+            Array.Copy(Encoding.ASCII.GetBytes("0000000"), 0, header, 337, 7);
 
             // check sum for header block (8) [calculated last]
-            Array.Copy(m_asciiEncoding.GetBytes("        "), 0, header, 148, 8);
+            Array.Copy(Encoding.ASCII.GetBytes("        "), 0, header, 148, 8);
 
             int checksum = 0;
             foreach (byte b in header)

OpenSim/Framework/Servers/BaseOpenSimServer.cs

@@ -591,8 +591,8 @@ namespace OpenSim.Framework.Servers
             {
                 string pidstring = System.Diagnostics.Process.GetCurrentProcess().Id.ToString();
                 FileStream fs = File.Create(path);
-                System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+
-                Byte[] buf = enc.GetBytes(pidstring);
+                Byte[] buf = Encoding.ASCII.GetBytes(pidstring);
                 fs.Write(buf, 0, buf.Length);
                 fs.Close();
                 m_pidFile = path;

OpenSim/Framework/Util.cs

@@ -1236,8 +1236,7 @@ namespace OpenSim.Framework
 
         public static string Base64ToString(string str)
         {
-            UTF8Encoding encoder = new UTF8Encoding();
+            Decoder utf8Decode = Encoding.UTF8.GetDecoder();
-            Decoder utf8Decode = encoder.GetDecoder();
 
             byte[] todecode_byte = Convert.FromBase64String(str);
             int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

OpenSim/Region/CoreModules/World/Archiver/AssetsDearchiver.cs

@@ -46,8 +46,6 @@ namespace OpenSim.Region.CoreModules.World.Archiver
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
-        protected static ASCIIEncoding m_asciiEncoding = new ASCIIEncoding();
-
         /// <summary>
         /// Store for asset data we received before we get the metadata
         /// </summary>

OpenSim/Region/CoreModules/World/Terrain/FileLoaders/Terragen.cs

@@ -250,7 +250,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain.FileLoaders
             if (horizontalScale < 0.01d)
                 horizontalScale = 0.01d;
 
-            System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+            Encoding enc = Encoding.ASCII;
 
             bs.Write(enc.GetBytes("TERRAGENTERRAIN "));
 

OpenSim/Region/OptionalModules/Avatar/Voice/FreeSwitchVoice/FreeSwitchVoiceModule.cs

@@ -823,11 +823,10 @@ namespace OpenSim.Region.OptionalModules.Avatar.Voice.FreeSwitchVoice
                 m_log.DebugFormat("[FreeSwitchVoice]: Region:Parcel \"{0}\": parcel id {1}: using channel name {2}",
                                   landName, land.LocalID, landUUID);
             }
-            System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
 
             // slvoice handles the sip address differently if it begins with confctl, hiding it from the user in the friends list. however it also disables
             // the personal speech indicators as well unless some siren14-3d codec magic happens. we dont have siren143d so we'll settle for the personal speech indicator.
-            channelUri = String.Format("sip:conf-{0}@{1}", "x" + Convert.ToBase64String(encoding.GetBytes(landUUID)), m_freeSwitchRealm);
+            channelUri = String.Format("sip:conf-{0}@{1}", "x" + Convert.ToBase64String(Encoding.ASCII.GetBytes(landUUID)), m_freeSwitchRealm);
 
             lock (m_ParcelAddress)
             {

OpenSim/Region/OptionalModules/Avatar/XmlRpcGroups/XmlRpcGroupsServicesConnectorModule.cs

@@ -1120,7 +1120,6 @@ namespace Nwc.XmlRpc
     /// <summary>Class supporting the request side of an XML-RPC transaction.</summary>
     public class ConfigurableKeepAliveXmlRpcRequest : XmlRpcRequest
     {
-        private Encoding _encoding = new ASCIIEncoding();
         private XmlRpcRequestSerializer _serializer = new XmlRpcRequestSerializer();
         private XmlRpcResponseDeserializer _deserializer = new XmlRpcResponseDeserializer();
         private bool _disableKeepAlive = true;
@@ -1153,7 +1152,7 @@ namespace Nwc.XmlRpc
             request.KeepAlive = !_disableKeepAlive;
 
             Stream stream = request.GetRequestStream();
-            XmlTextWriter xml = new XmlTextWriter(stream, _encoding);
+            XmlTextWriter xml = new XmlTextWriter(stream, Encoding.ASCII);
             _serializer.Serialize(xml, this);
             xml.Flush();
             xml.Close();

OpenSim/Region/OptionalModules/Scripting/Minimodule/MRMModule.cs

@@ -482,10 +482,7 @@ namespace OpenSim.Region.OptionalModules.Scripting.Minimodule
             // Convert to base64
             //
             string filetext = Convert.ToBase64String(data);
-
+            Byte[] buf = Encoding.ASCII.GetBytes(filetext);
-            ASCIIEncoding enc = new ASCIIEncoding();
-
-            Byte[] buf = enc.GetBytes(filetext);
 
             m_log.Info("MRM 9");
 

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -10299,9 +10299,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                     return;
                 }
 
-                System.Text.UTF8Encoding enc =
+                string data = Encoding.UTF8.GetString(a.Data);
-                    new System.Text.UTF8Encoding();
-                string data = enc.GetString(a.Data);
                 //m_log.Debug(data);
                 NotecardCache.Cache(id, data);
                 AsyncCommands.
@@ -10354,9 +10352,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                                  return;
                              }
 
-                             System.Text.UTF8Encoding enc =
+                             string data = Encoding.UTF8.GetString(a.Data);
-                                 new System.Text.UTF8Encoding();
-                             string data = enc.GetString(a.Data);
                              //m_log.Debug(data);
                              NotecardCache.Cache(id, data);
                              AsyncCommands.DataserverPlugin.DataserverReply(id.ToString(),

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs

@@ -1820,8 +1820,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                 if (a == null)
                     return UUID.Zero;
 
-                System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding();
+                string data = Encoding.UTF8.GetString(a.Data);
-                string data = enc.GetString(a.Data);
                 NotecardCache.Cache(assetID, data);
             };
 

OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs

@@ -31,6 +31,7 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.Reflection;
 using System.IO;
+using System.Text;
 using Microsoft.CSharp;
 //using Microsoft.JScript;
 using Microsoft.VisualBasic;
@@ -708,9 +709,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             //
             string filetext = System.Convert.ToBase64String(data);
 
-            System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+            Byte[] buf = Encoding.ASCII.GetBytes(filetext);
-
-            Byte[] buf = enc.GetBytes(filetext);
 
             FileStream sfs = File.Create(assembly + ".text");
             sfs.Write(buf, 0, buf.Length);
@@ -801,8 +800,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
                 mapstring += String.Format("{0},{1},{2},{3}\n", k.Key, k.Value, v.Key, v.Value);
             }
 
-            System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+            Byte[] mapbytes = Encoding.ASCII.GetBytes(mapstring);
-            Byte[] mapbytes = enc.GetBytes(mapstring);
             FileStream mfs = File.Create(filename);
             mfs.Write(mapbytes, 0, mapbytes.Length);
             mfs.Close();

OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs

@@ -26,15 +26,16 @@
  */
 
 using System;
-using System.IO;
-using System.Runtime.Remoting;
-using System.Runtime.Remoting.Lifetime;
-using System.Threading;
 using System.Collections;
 using System.Collections.Generic;
-using System.Security.Policy;
-using System.Reflection;
 using System.Globalization;
+using System.IO;
+using System.Reflection;
+using System.Runtime.Remoting;
+using System.Runtime.Remoting.Lifetime;
+using System.Security.Policy;
+using System.Text;
+using System.Threading;
 using System.Xml;
 using OpenMetaverse;
 using log4net;
@@ -295,13 +296,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
                         using (FileStream fs = File.Open(savedState,
                                                          FileMode.Open, FileAccess.Read, FileShare.None))
                         {
-                            System.Text.UTF8Encoding enc =
-                                new System.Text.UTF8Encoding();
-
                             Byte[] data = new Byte[size];
                             fs.Read(data, 0, size);
 
-                            xml = enc.GetString(data);
+                            xml = Encoding.UTF8.GetString(data);
 
                             ScriptSerializer.Deserialize(xml, this);
 
@@ -945,8 +943,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
                 try
                 {
                     FileStream fs = File.Create(Path.Combine(Path.GetDirectoryName(assembly), ItemID.ToString() + ".state"));
-                    System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding();
+                    Byte[] buf = (new UTF8Encoding()).GetBytes(xml);
-                    Byte[] buf = enc.GetBytes(xml);
                     fs.Write(buf, 0, buf.Length);
                     fs.Close();
                 }

OpenSim/Region/ScriptEngine/XEngine/XEngine.cs

@@ -1756,7 +1756,7 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                             tfs.Read(tdata, 0, tdata.Length);
                         }
 
-                        assem = new System.Text.ASCIIEncoding().GetString(tdata);
+                        assem = Encoding.ASCII.GetString(tdata);
                     }
                     catch (Exception e)
                     {

OpenSim/Server/Base/ServicesServerBase.cs

@@ -27,9 +27,10 @@
 
 using System;
 using System.IO;
-using System.Xml;
-using System.Threading;
 using System.Reflection;
+using System.Threading;
+using System.Text;
+using System.Xml;
 using OpenSim.Framework;
 using OpenSim.Framework.Console;
 using log4net;
@@ -335,8 +336,7 @@ namespace OpenSim.Server.Base
             {
                 string pidstring = System.Diagnostics.Process.GetCurrentProcess().Id.ToString();
                 FileStream fs = File.Create(path);
-                System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+                Byte[] buf = Encoding.ASCII.GetBytes(pidstring);
-                Byte[] buf = enc.GetBytes(pidstring);
                 fs.Write(buf, 0, buf.Length);
                 fs.Close();
                 m_pidFile = path;

OpenSim/Tools/Compiler/Program.cs

@@ -28,6 +28,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Text;
 using Microsoft.CSharp;
 using OpenSim.Region.ScriptEngine.Shared.CodeTools;
 using System.CodeDom.Compiler;
@@ -201,12 +202,8 @@ namespace OpenSim.Tools.LSL.Compiler
             // Convert to base64
             //
             string filetext = System.Convert.ToBase64String(data);
-
+            Byte[] buf = Encoding.ASCII.GetBytes(filetext);
-            System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
+            FileStream sfs = File.Create(OutFile + ".text");
-
-            Byte[] buf = enc.GetBytes(filetext);
-
-            FileStream sfs = File.Create(OutFile+".text");
             sfs.Write(buf, 0, buf.Length);
             sfs.Close();
 
@@ -222,9 +219,9 @@ namespace OpenSim.Tools.LSL.Compiler
 //                }
 //            }
 
-            buf = enc.GetBytes(posmap);
+            buf = Encoding.ASCII.GetBytes(posmap);
 
-            FileStream mfs = File.Create(OutFile+".map");
+            FileStream mfs = File.Create(OutFile + ".map");
             mfs.Write(buf, 0, buf.Length);
             mfs.Close();