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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SocketTest.Common
{
/// <summary>
/// Copyright (C) 2017 yjq 版权所有。
/// 类名：ByteUtil.cs
/// 类属性：公共类（非静态）
/// 类功能描述：
/// 创建标识：yjq 2017/11/24 11:12:43
/// </summary>
public static class ByteUtil
{
public static readonly byte[] ZeroLengthBytes = BitConverter.GetBytes(0);
public static readonly byte[] EmptyBytes = new byte[0];
public static void EncodeString(this string data, out byte[] lengthBytes, out byte[] dataBytes)
{
if (data == null)
{
lengthBytes = EmptyBytes;
dataBytes = ZeroLengthBytes;
}
else
{
dataBytes = Encoding.UTF8.GetBytes(data);
lengthBytes = BitConverter.GetBytes(dataBytes.Length);
}
}
public static byte[] EncodeDateTime(this DateTime data)
{
return BitConverter.GetBytes(data.Ticks);
}
public static string DecodeString(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
return Encoding.UTF8.GetString(sourceBuffer.DecodeBytes(startOffset, out nextStartOffset));
}
public static short DecodeShort(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
var shortBytes = new byte[2];
Buffer.BlockCopy(sourceBuffer, startOffset, shortBytes, 0, 2);
nextStartOffset = startOffset + 2;
return BitConverter.ToInt16(shortBytes, 0);
}
public static int DecodeInt(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
var intBytes = new byte[4];
Buffer.BlockCopy(sourceBuffer, startOffset, intBytes, 0, 4);
nextStartOffset = startOffset + 4;
return BitConverter.ToInt32(intBytes, 0);
}
public static long DecodeLong(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
var longBytes = new byte[8];
Buffer.BlockCopy(sourceBuffer, startOffset, longBytes, 0, 8);
nextStartOffset = startOffset + 8;
return BitConverter.ToInt64(longBytes, 0);
}
public static DateTime DecodeDateTime(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
var longBytes = new byte[8];
Buffer.BlockCopy(sourceBuffer, startOffset, longBytes, 0, 8);
nextStartOffset = startOffset + 8;
return new DateTime(BitConverter.ToInt64(longBytes, 0));
}
public static byte[] DecodeBytes(this byte[] sourceBuffer, int startOffset, out int nextStartOffset)
{
var lengthBytes = new byte[4];
Buffer.BlockCopy(sourceBuffer, startOffset, lengthBytes, 0, 4);
startOffset += 4;
var length = BitConverter.ToInt32(lengthBytes, 0);
var dataBytes = new byte[length];
Buffer.BlockCopy(sourceBuffer, startOffset, dataBytes, 0, length);
startOffset += length;
nextStartOffset = startOffset;
return dataBytes;
}
public static byte[] Combine(params byte[][] arrays)
{
byte[] destination = new byte[arrays.Sum(x => x.Length)];
int offset = 0;
foreach (byte[] data in arrays)
{
Buffer.BlockCopy(data, 0, destination, offset, data.Length);
offset += data.Length;
}
return destination;
}
public static byte[] CombineToByte(this IEnumerable<byte[]> arrays)
{
byte[] destination = new byte[arrays.Sum(x => x.Length)];
int offset = 0;
foreach (byte[] data in arrays)
{
Buffer.BlockCopy(data, 0, destination, offset, data.Length);
offset += data.Length;
}
return destination;
}
}
}