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// **********************************************************************
//
// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
namespace IceInternal
{
sealed class Protocol
{
//
// Size of the Ice protocol header
//
// Magic number (4 bytes)
// Protocol version major (Byte)
// Protocol version minor (Byte)
// Encoding version major (Byte)
// Encoding version minor (Byte)
// Message type (Byte)
// Compression status (Byte)
// Message size (Int)
//
internal const int headerSize = 14;
//
// The magic number at the front of each message
//
internal static readonly byte[] magic
= new byte[] { (byte)0x49, (byte)0x63, (byte)0x65, (byte)0x50 }; // 'I', 'c', 'e', 'P'
//
// The current Ice protocol and encoding version
//
internal const byte protocolMajor = 1;
internal const byte protocolMinor = 0;
internal const byte protocolEncodingMajor = 1;
internal const byte protocolEncodingMinor = 0;
internal const byte encodingMajor = 1;
internal const byte encodingMinor = 1;
//
// The Ice protocol message types
//
internal const byte requestMsg = 0;
internal const byte requestBatchMsg = 1;
internal const byte replyMsg = 2;
internal const byte validateConnectionMsg = 3;
internal const byte closeConnectionMsg = 4;
internal static readonly byte[] requestHdr = new byte[]
{
IceInternal.Protocol.magic[0], IceInternal.Protocol.magic[1], IceInternal.Protocol.magic[2],
IceInternal.Protocol.magic[3],
IceInternal.Protocol.protocolMajor, IceInternal.Protocol.protocolMinor,
IceInternal.Protocol.protocolEncodingMajor, IceInternal.Protocol.protocolEncodingMinor,
IceInternal.Protocol.requestMsg,
(byte)0, // Compression status.
(byte)0, (byte)0, (byte)0, (byte)0, // Message size (placeholder).
(byte)0, (byte)0, (byte)0, (byte)0 // Request ID (placeholder).
};
internal static readonly byte[] requestBatchHdr = new byte[]
{
IceInternal.Protocol.magic[0], IceInternal.Protocol.magic[1], IceInternal.Protocol.magic[2],
IceInternal.Protocol.magic[3],
IceInternal.Protocol.protocolMajor, IceInternal.Protocol.protocolMinor,
IceInternal.Protocol.protocolEncodingMajor, IceInternal.Protocol.protocolEncodingMinor,
IceInternal.Protocol.requestBatchMsg,
(byte)0, // Compression status.
(byte)0, (byte)0, (byte)0, (byte)0, // Message size (placeholder).
(byte)0, (byte)0, (byte)0, (byte)0 // Number of requests in batch (placeholder).
};
internal static readonly byte[] replyHdr = new byte[]
{
IceInternal.Protocol.magic[0], IceInternal.Protocol.magic[1], IceInternal.Protocol.magic[2],
IceInternal.Protocol.magic[3],
IceInternal.Protocol.protocolMajor, IceInternal.Protocol.protocolMinor,
IceInternal.Protocol.protocolEncodingMajor, IceInternal.Protocol.protocolEncodingMinor,
IceInternal.Protocol.replyMsg,
(byte)0, // Compression status.
(byte)0, (byte)0, (byte)0, (byte)0 // Message size (placeholder).
};
internal static void
checkSupportedProtocol(Ice.ProtocolVersion v)
{
if(v.major != protocolMajor || v.minor > protocolMinor)
{
throw new Ice.UnsupportedProtocolException("", v, Ice.Util.currentProtocol);
}
}
internal static void
checkSupportedProtocolEncoding(Ice.EncodingVersion v)
{
if(v.major != protocolEncodingMajor || v.minor > protocolEncodingMinor)
{
throw new Ice.UnsupportedEncodingException("", v, Ice.Util.currentProtocolEncoding);
}
}
internal static void
checkSupportedEncoding(Ice.EncodingVersion v)
{
if(v.major != encodingMajor || v.minor > encodingMinor)
{
throw new Ice.UnsupportedEncodingException("", v, Ice.Util.currentEncoding);
}
}
//
// Either return the given protocol if not compatible, or the greatest
// supported protocol otherwise.
//
internal static Ice.ProtocolVersion
getCompatibleProtocol(Ice.ProtocolVersion v)
{
if(v.major != Ice.Util.currentProtocol.major)
{
return v; // Unsupported protocol, return as is.
}
else if(v.minor < Ice.Util.currentProtocol.minor)
{
return v; // Supported protocol.
}
else
{
//
// Unsupported but compatible, use the currently supported
// protocol, that's the best we can do.
//
return Ice.Util.currentProtocol;
}
}
//
// Either return the given encoding if not compatible, or the greatest
// supported encoding otherwise.
//
internal static Ice.EncodingVersion
getCompatibleEncoding(Ice.EncodingVersion v)
{
if(v.major != Ice.Util.currentEncoding.major)
{
return v; // Unsupported encoding, return as is.
}
else if(v.minor < Ice.Util.currentEncoding.minor)
{
return v; // Supported encoding.
}
else
{
//
// Unsupported but compatible, use the currently supported
// encoding, that's the best we can do.
//
return Ice.Util.currentEncoding;
}
}
internal static bool
isSupported(Ice.ProtocolVersion version, Ice.ProtocolVersion supported)
{
return version.major == supported.major && version.minor <= supported.minor;
}
internal static bool
isSupported(Ice.EncodingVersion version, Ice.EncodingVersion supported)
{
return version.major == supported.major && version.minor <= supported.minor;
}
private Protocol()
{
}
}
}
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