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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel
{
using System.IO;
using System.Security.Cryptography;
using System.IdentityModel.Tokens;
using System.Xml;
using System.Text;
// for sequential use by one thread
sealed class SignatureResourcePool
{
const int BufferSize = 64;
CanonicalizationDriver canonicalizationDriver;
HashStream hashStream;
HashAlgorithm hashAlgorithm;
#if NO
XmlC14NWriter integratedWriter;
#endif
XmlDictionaryWriter utf8Writer;
byte[] encodingBuffer;
char[] base64Buffer;
public char[] TakeBase64Buffer()
{
if (this.base64Buffer == null)
{
this.base64Buffer = new char[BufferSize];
}
return this.base64Buffer;
}
public CanonicalizationDriver TakeCanonicalizationDriver()
{
if (this.canonicalizationDriver == null)
{
this.canonicalizationDriver = new CanonicalizationDriver();
}
else
{
this.canonicalizationDriver.Reset();
}
return this.canonicalizationDriver;
}
public byte[] TakeEncodingBuffer()
{
if (this.encodingBuffer == null)
{
this.encodingBuffer = new byte[BufferSize];
}
return this.encodingBuffer;
}
public HashAlgorithm TakeHashAlgorithm(string algorithm)
{
if ( this.hashAlgorithm == null )
{
if ( string.IsNullOrEmpty( algorithm ) )
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument( algorithm, SR.GetString( SR.EmptyOrNullArgumentString, "algorithm" ) );
}
this.hashAlgorithm = CryptoHelper.CreateHashAlgorithm( algorithm );
}
else
{
this.hashAlgorithm.Initialize();
}
return this.hashAlgorithm;
}
public HashStream TakeHashStream(HashAlgorithm hash)
{
if (this.hashStream == null)
{
this.hashStream = new HashStream(hash);
}
else
{
this.hashStream.Reset(hash);
}
return this.hashStream;
}
public HashStream TakeHashStream(string algorithm)
{
return TakeHashStream(TakeHashAlgorithm(algorithm));
}
#if NO
public XmlC14NWriter TakeIntegratedWriter(Stream stream)
{
return TakeIntegratedWriter(stream, false, null);
}
public XmlC14NWriter TakeIntegratedWriter(Stream stream, bool includeComments, string[] inclusivePrefixes)
{
if (this.integratedWriter == null)
{
this.integratedWriter = new XmlC14NWriter(stream, includeComments, inclusivePrefixes);
}
else
{
this.integratedWriter.SetOutput(stream, includeComments, inclusivePrefixes);
}
return this.integratedWriter;
}
#endif
public XmlDictionaryWriter TakeUtf8Writer()
{
if (this.utf8Writer == null)
{
this.utf8Writer = XmlDictionaryWriter.CreateTextWriter(Stream.Null, Encoding.UTF8, false);
}
else
{
((IXmlTextWriterInitializer) this.utf8Writer).SetOutput(Stream.Null, Encoding.UTF8, false);
}
return this.utf8Writer;
}
}
}
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