Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Transactions / WhereaboutsReader.cs / 1 / WhereaboutsReader.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.ServiceModel.Transactions { using System; using System.IO; using System.Net; using System.Text; using Microsoft.Transactions.Wsat.Protocol; using Microsoft.Transactions.Wsat.Recovery; class WhereaboutsReader { string hostName; ProtocolInformationReader protocolInfo; // Whereabouts internals static Guid GuidWhereaboutsInfo = new Guid("{2adb4462-bd41-11d0-b12e-00c04fc2f3ef}"); const long STmToTmProtocolSize = 4 + 4; enum TmProtocol { TmProtocolNone = 0, TmProtocolTip = 1, TmProtocolMsdtcV1 = 2, TmProtocolMsdtcV2 = 3, // unicode host names in nameobject blobs etc TmProtocolExtended = 4 // other stuff (e.g., WS-AT) } public WhereaboutsReader(byte[] whereabouts) { MemoryStream mem = new MemoryStream(whereabouts, 0, whereabouts.Length, false, true); // Enable calls to GetBuffer() DeserializeWhereabouts(mem); } public string HostName { get { return this.hostName; } } public ProtocolInformationReader ProtocolInformation { get { return this.protocolInfo; } } void DeserializeWhereabouts(MemoryStream mem) { // guidSignature Guid signature = SerializationUtils.ReadGuid(mem); if (signature != GuidWhereaboutsInfo) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsSignatureMissing))); } // cTmToTmProtocols uint cTmToTmProtocols = SerializationUtils.ReadUInt(mem); // Make sure that cTmToTmProtocols is at least plausible if (cTmToTmProtocols * STmToTmProtocolSize > mem.Length - mem.Position) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsImplausibleProtocolCount))); } // Loop through each protocol for (uint i = 0; i < cTmToTmProtocols; i++) { DeserializeWhereaboutsProtocol(mem); } // Require a host name if (string.IsNullOrEmpty(this.hostName)) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsNoHostName))); } } void DeserializeWhereaboutsProtocol(MemoryStream mem) { // tmprotDescribed TmProtocol tmprotDescribed = (TmProtocol)SerializationUtils.ReadInt(mem); // cbTmProtocolData uint cbTmProtocolData = SerializationUtils.ReadUInt(mem); switch (tmprotDescribed) { case TmProtocol.TmProtocolMsdtcV2: ReadMsdtcV2Protocol(mem, cbTmProtocolData); break; case TmProtocol.TmProtocolExtended: ReadExtendedProtocol(mem, cbTmProtocolData); break; default: // We don't care about this protocol SerializationUtils.IncrementPosition(mem, cbTmProtocolData); break; } // Align the cursor to a 4-byte boundary SerializationUtils.AlignPosition(mem, 4); } void ReadMsdtcV2Protocol(MemoryStream mem, uint cbTmProtocolData) { const int MaxComputerName = 15; // // The host name is encoded in unicode format // It is followed by a null-terminating unicode character, // plus some padding to align on 4 // // Reject host names of disproportionate size if (cbTmProtocolData > (MaxComputerName + 1) * 2) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsImplausibleHostNameByteCount))); } byte[] chars = SerializationUtils.ReadBytes(mem, (int)cbTmProtocolData); // Count the bytes until the first null terminating character int cbString = 0; while (cbString < cbTmProtocolData - 1 && (chars[cbString] != 0 || chars[cbString + 1] != 0)) { cbString += 2; } if (cbString == 0) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsInvalidHostName))); } try { this.hostName = Encoding.Unicode.GetString(chars, 0, cbString); } catch (ArgumentException e) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SerializationException(SR.GetString(SR.WhereaboutsInvalidHostName), e)); } } void ReadExtendedProtocol(MemoryStream mem, uint cbTmProtocolData) { // Read the WSAT1.0 protoocol identifier Guid guid = SerializationUtils.ReadGuid(mem); if ( guid == PluggableProtocol10.ProtocolGuid || guid == PluggableProtocol11.ProtocolGuid) { // This is the WS-AT extended whereabouts blob this.protocolInfo = new ProtocolInformationReader(mem); } else { // Some other gateway protocol... Skip the rest of the data SerializationUtils.IncrementPosition(mem, cbTmProtocolData - 16); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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