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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.IO.Compression;
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using System.Linq;
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using System.Text;
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namespace HslCommunication.BasicFramework
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{
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/// <summary>
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/// 一个负责压缩解压数据字节的类
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/// </summary>
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public class SoftZipped
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{
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// 压缩字节
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// 1.创建压缩的数据流
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// 2.设定compressStream为存放被压缩的文件流,并设定为压缩模式
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// 3.将需要压缩的字节写到被压缩的文件流
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/// <summary>
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/// 压缩字节数据
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/// </summary>
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/// <param name="bytes">等待被压缩的数据</param>
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/// <exception cref="ArgumentNullException"></exception>
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/// <returns>压缩之后的字节数据</returns>
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public static byte[] CompressBytes(byte[] bytes)
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{
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if (bytes == null) throw new ArgumentNullException("bytes");
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using (MemoryStream compressStream = new MemoryStream())
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{
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using (var zipStream = new GZipStream(compressStream, CompressionMode.Compress))
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zipStream.Write(bytes, 0, bytes.Length);
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return compressStream.ToArray();
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}
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}
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// 解压缩字节
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// 1.创建被压缩的数据流
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// 2.创建zipStream对象，并传入解压的文件流
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// 3.创建目标流
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// 4.zipStream拷贝到目标流
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// 5.返回目标流输出字节
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/// <summary>
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/// 解压压缩后的数据
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/// </summary>
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/// <param name="bytes">压缩后的数据</param>
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/// <exception cref="ArgumentNullException"></exception>
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/// <returns>压缩前的原始字节数据</returns>
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public static byte[] Decompress(byte[] bytes)
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{
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if (bytes == null) throw new ArgumentNullException("bytes");
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using (var compressStream = new MemoryStream(bytes))
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{
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using (var zipStream = new GZipStream(compressStream, CompressionMode.Decompress))
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{
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using (var resultStream = new MemoryStream())
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{
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int readLength = 1024;
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byte[] buf = new byte[readLength];
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int len = 0;
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while ((len = zipStream.Read(buf, 0, readLength)) > 0)
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{
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resultStream.Write(buf, 0, len);
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}
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return resultStream.ToArray();
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}
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}
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}
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}
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}
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}
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