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/*
* 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;
}
}
}