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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace ReadingStructureData
{
struct Packet
{
public short Source;
public short Destination;
public int Checksum;
public int Identifier;
public int SecondaryIdentifier;
}
class Program
{
static Packet ReadUsingBinaryReader(byte[] data)
{
Packet packet;
using (BinaryReader reader = new BinaryReader(new MemoryStream(data, false)))
{
packet.Source = reader.ReadInt16();
packet.Destination = reader.ReadInt16();
packet.Checksum = reader.ReadInt32();
packet.Identifier = reader.ReadInt32();
packet.SecondaryIdentifier = reader.ReadInt32();
}
return packet;
}
static Packet ReadUsingPointer(byte[] data)
{
unsafe
{
fixed (byte* packet = &data[0])
{
return *(Packet*)packet;
}
}
}
static T ReadUsingMarshalSafe<T>(byte[] data) where T : struct
{
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
return (T)Marshal.PtrToStructure(gch.AddrOfPinnedObject(), typeof(T));
}
finally
{
gch.Free();
}
}
static T ReadUsingMarshalUnsafe<T>(byte[] data) where T : struct
{
unsafe
{
fixed (byte* p = &data[0])
{
return (T) Marshal.PtrToStructure(new IntPtr(p), typeof(T));
}
}
}
static T ReadUsingCppCli<T>(byte[] data) where T : struct
{
return GenericRead.Reader.Read<T>(data);
}
static void Main(string[] args)
{
byte[] data = { 1, 0, 2, 0, 5, 0, 0, 0, 6, 0, 0, 0, 8, 0, 0, 0 };
Stopwatch stopwatch;
Console.WriteLine("Non-Generic Solutions:" + Environment.NewLine);
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 1000000; ++i)
{
ReadUsingBinaryReader(data);
}
Console.WriteLine("BinaryReader: " + stopwatch.ElapsedMilliseconds);
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 1000000; ++i)
{
ReadUsingPointer(data);
}
Console.WriteLine("Pointer: " + stopwatch.ElapsedMilliseconds);
Console.WriteLine(Environment.NewLine + Environment.NewLine +
"Generic Solutions:" + Environment.NewLine);
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 1000000; ++i)
{
ReadUsingMarshalSafe<Packet>(data);
}
Console.WriteLine("MarshalSafe: " + stopwatch.ElapsedMilliseconds);
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 1000000; ++i)
{
ReadUsingMarshalUnsafe<Packet>(data);
}
Console.WriteLine("MarshalUnsafe: " + stopwatch.ElapsedMilliseconds);
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 1000000; ++i)
{
ReadUsingCppCli<Packet>(data);
}
Console.WriteLine("C++/CLI: " + stopwatch.ElapsedMilliseconds);
}
}
}
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Sasha Goldshtein is the CTO of SELA Group, an Israeli company specializing in training, consulting and outsourcing to local and international customers.
Sasha's work is divided across these three primary disciplines. He consults for clients on architecture, development, debugging and performance issues; he actively develops code using the latest bits of technology from Microsoft; and he conducts training classes on a variety of topics, from Windows Internals to .NET Performance.
You can read more about Sasha's work and his latest ventures at his blog: http://blogs.microsoft.co.il/blogs/sasha
Sasha writes from Jerusalem, Israel.