65 lines
2.0 KiB
C#
65 lines
2.0 KiB
C#
/*
|
||
* Copyright (C) Alibaba Cloud Computing
|
||
* All rights reserved.
|
||
*
|
||
* 版权所有 （C）阿里云计算有限公司
|
||
*/
|
||
|
||
using System;
|
||
using System.Diagnostics;
|
||
using System.IO;
|
||
|
||
namespace Aliyun.Api.LOG.Common.Utilities
|
||
{
|
||
/// <summary>
|
||
/// Description of IOUtils.
|
||
/// </summary>
|
||
internal static class IOUtils
|
||
{
|
||
private const int _bufferSize = 1024 * 4;
|
||
|
||
public static void WriteTo(this Stream src, Stream dest){
|
||
if (dest == null)
|
||
throw new ArgumentNullException("dest");
|
||
|
||
byte[] buffer = new byte[_bufferSize];
|
||
int bytesRead = 0;
|
||
while((bytesRead = src.Read(buffer, 0, buffer.Length)) > 0)
|
||
{
|
||
dest.Write(buffer, 0, bytesRead);
|
||
}
|
||
dest.Flush();
|
||
}
|
||
|
||
/// <summary>
|
||
/// Write a stream to another
|
||
/// </summary>
|
||
/// <param name="orignStream">The stream you want to write from</param>
|
||
/// <param name="destStream">The stream written to</param>
|
||
/// <param name="maxLength">The max length of the stream to write</param>
|
||
/// <returns>The actual length written to destStream</returns>
|
||
public static long WriteTo(this Stream orignStream, Stream destStream, long maxLength)
|
||
{
|
||
const int buffSize = 1024;
|
||
byte[] buff = new byte[buffSize];
|
||
long alreadyRead = 0;
|
||
|
||
int readCount = 0;
|
||
while (alreadyRead < maxLength)
|
||
{
|
||
readCount = orignStream.Read(buff, 0, buffSize);
|
||
if (readCount <= 0) { break; }
|
||
|
||
if (alreadyRead + readCount > maxLength)
|
||
{
|
||
readCount = (int) (maxLength - alreadyRead);
|
||
}
|
||
alreadyRead += readCount;
|
||
destStream.Write(buff, 0, readCount);
|
||
}
|
||
destStream.Flush();
|
||
return alreadyRead;
|
||
}
|
||
}
|
||
}
|