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Code Issues Releases Activity

NetOutgoingMessage.Write(float) optimized to avoid memory allocation

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lidgren
2012-01-20 09:52:19 +00:00
parent 61ec7e3add
commit e07f7c75c9
2 changed files with 21 additions and 10 deletions
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27
Lidgren.Network/NetOutgoingMessage.Write.cs
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@@ -21,9 +21,21 @@ using System.Collections.Generic;
using System.Net; using System.Net;
using System.Reflection; using System.Reflection;
using System.Text; using System.Text;
using System.Runtime.InteropServices;
namespace Lidgren.Network namespace Lidgren.Network
{ {
[StructLayout(LayoutKind.Explicit)]
public struct SingleUIntUnion
{
[FieldOffset(0)]
public float SingleValue;
[FieldOffset(0)]
[CLSCompliant(false)]
public uint UIntValue;
}
public sealed partial class NetOutgoingMessage public sealed partial class NetOutgoingMessage
{ {
private const int c_overAllocateAmount = 4; private const int c_overAllocateAmount = 4;
@@ -386,17 +398,16 @@ namespace Lidgren.Network
/// </summary> /// </summary>
public void Write(float source) public void Write(float source)
{ {
byte[] val = BitConverter.GetBytes(source); // Use union to avoid BitConverter.GetBytes() which allocates memory on the heap
SingleUIntUnion su;
su.UIntValue = 0; // must initialize every member of the union to avoid warning
su.SingleValue = source;
#if BIGENDIAN #if BIGENDIAN
// swap byte order // swap byte order
byte tmp = val[3]; su.UIntValue = NetUtility.SwapByteOrder(su.UIntValue);
val[3] = val[0];
val[0] = tmp;
tmp = val[2];
val[2] = val[1];
val[1] = tmp;
#endif #endif
Write(val); Write(su.UIntValue);
} }
#endif #endif

4
UnitTests/ReadWriteTests.cs
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@@ -49,7 +49,7 @@ namespace UnitTests
int bcnt = 0; int bcnt = 0;
msg.Write(45.0f); msg.Write(567845.0f);
msg.WriteVariableInt32(2115998022); msg.WriteVariableInt32(2115998022);
msg.Write(46.0); msg.Write(46.0);
bcnt += msg.WriteVariableInt32(-47); bcnt += msg.WriteVariableInt32(-47);
@@ -94,7 +94,7 @@ namespace UnitTests
bdr.Append(inc.ReadVariableUInt32()); bdr.Append(inc.ReadVariableUInt32());
bdr.Append(inc.ReadVariableInt64()); bdr.Append(inc.ReadVariableInt64());
if (bdr.ToString().Equals("False-342duke of earl4344True45211599802246-4747000048-49")) if (bdr.ToString().Equals("False-342duke of earl4344True567845211599802246-4747000048-49"))
Console.WriteLine("Read/write tests OK"); Console.WriteLine("Read/write tests OK");
else else
throw new NetException("Read/write tests FAILED!"); throw new NetException("Read/write tests FAILED!");