在压缩解压缩前需要将图片、文字、字符串等数据转化为字节数组byte[]，
压缩解压缩以后再将字节数组byte[]转化为图片、文字、字符串。
转化过程请参考
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本章只介绍字节数组的压缩解压缩。
以下压缩解压需要引用的空间
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.IO;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Tar;using ICSharpCode.SharpZipLib.GZip;using ICSharpCode.SharpZipLib.BZip2;using pression;using System.Runtime.InteropServices;
bzip2压缩
public static byte[] bzip2Compress(byte[] data){MemoryStream ms = new MemoryStream();Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);try{stream.Write(data, 0, data.Length);}finally{stream.Close();ms.Close();}return ms.ToArray();}
bzip2解压
public static byte[] bzip2Decompress(byte[] buffer){MemoryStream ms = new MemoryStream(buffer);Stream sm = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(ms);byte[] bytes = new byte[sm.Length];sm.Read(bytes, 0, bytes.Length);sm.Close();ms.Close();return bytes;}
tar压缩
public static byte[] tarCompress(byte[] data){MemoryStream ms = new MemoryStream();Stream stream = new ICSharpCode.SharpZipLib.Tar.TarOutputStream(ms);try{stream.Write(data, 0, data.Length);}finally{stream.Close();ms.Close();}return ms.ToArray();}
tar解压
public static byte[] tarDecompress(byte[] buffer){MemoryStream ms = new MemoryStream(buffer);Stream sm = new TarInputStream(ms);byte[] bytes = new byte[sm.Length];sm.Read(bytes, 0, bytes.Length);sm.Close();ms.Close();return bytes;}
zip压缩数据流成文件，同时返回数据流
public static byte[] zipCompress(string filename, byte[] filecontent){byte[] b = new byte[] { };if (filecontent == null || filecontent.Length == 0)return b;MemoryStream ms = new MemoryStream();ZipOutputStream zipOS = new ZipOutputStream(ms);zipOS.SetLevel(6);ZipEntry entry = new ZipEntry(filename);entry.DateTime = DateTime.Now;entry.Size = filecontent.Length;//crc.Reset();//crc.Update(filecontent);//entry.Crc = crc.Value;zipOS.PutNextEntry(entry);zipOS.Write(filecontent, 0, filecontent.Length);if (zipOS != null){zipOS.Finish();b = ms.ToArray();zipOS.Close();ms.Close();}return b;}
zip压缩数据流
public static byte[] zipCompress(byte[] data){byte[] back = new byte[] { };MemoryStream ms = new MemoryStream();ZipOutputStream zipOS = new ZipOutputStream(ms);zipOS.SetLevel(6);zipOS.Write(data, 0, data.Length);if (zipOS != null){zipOS.Finish();back = ms.ToArray();zipOS.Close();ms.Close();}return back;}
zip解压数据流,没有测试
public static byte[] zipDecompress(byte[] data){MemoryStream ms = new MemoryStream(data);ZipInputStream zipStream = new ZipInputStream(ms);byte[] back = new byte[zipStream.Length];zipStream.Read(back, 0, back.Length);zipStream.Close();zipStream.Dispose();return back;}
gzip字节数组压缩
public static byte[] gzipCompress(byte[] data){try{MemoryStream ms = new MemoryStream();GZipStream zip = new GZipStream(ms, press, true);zip.Write(data, 0, data.Length);zip.Close();byte[] buffer = new byte[ms.Length];ms.Position = 0;ms.Read(buffer, 0, buffer.Length);ms.Close();return buffer;}catch (Exception e){throw new Exception(e.Message);}}
gzip字节数组解压缩
public static byte[] gzipDecompress(byte[] data){try{MemoryStream ms = new MemoryStream(data);GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true);MemoryStream msreader = new MemoryStream();byte[] buffer = new byte[1024];while (true){int reader = zip.Read(buffer, 0, buffer.Length);if (reader <= 0){break;}msreader.Write(buffer, 0, reader);}zip.Close();ms.Close();msreader.Position = 0;buffer = msreader.ToArray();msreader.Close();return buffer;}catch (Exception e){throw new Exception(e.Message);}}
deflate压缩字节数组
public static byte[] deflateCompress(byte[] sourceByte){//压缩到内存流中MemoryStream memoryStream = new MemoryStream();DeflateStream zipStream = new DeflateStream(memoryStream, press, true);zipStream.Write(sourceByte, 0, sourceByte.Length);zipStream.Close();byte[] compressByte = memoryStream.ToArray();memoryStream.Close();return compressByte;}
deflate解压字节数组
public static byte[] deflateDeCompress(byte[] sourceByte){MemoryStream memStream = new MemoryStream(sourceByte);memStream.Position = 0;DeflateStream zipStream = new DeflateStream(memStream, CompressionMode.Decompress);memStream = new MemoryStream();byte[] buff = new byte[1024];while (true){int size = zipStream.Read(buff, 0, 512);memStream.Write(buff, 0, size);if (size < 512)break;}byte[] tempByte = memStream.ToArray();memStream.Close();return tempByte;}
ntdll压缩
ntdll.dd在win系统中自带，所以不需要额外引用其他文件，但是需要在代码中引入函数
public const ushort COMPRESSION_FORMAT_LZNT1 = 2;public const ushort COMPRESSION_ENGINE_MAXIMUM = 0x100;[DllImport("ntdll.dll")]public static extern uint RtlGetCompressionWorkSpaceSize(ushort dCompressionFormat, out uint dNeededBufferSize, out uint dUnknown);[DllImport("ntdll.dll")]public static extern uint RtlCompressBuffer(ushort dCompressionFormat, byte[] dSourceBuffer, int dSourceBufferLength, byte[] dDestinationBuffer,int dDestinationBufferLength, uint dUnknown, out int dDestinationSize, IntPtr dWorkspaceBuffer);[DllImport("ntdll.dll")]public static extern uint RtlDecompressBuffer(ushort dCompressionFormat, byte[] dDestinationBuffer, int dDestinationBufferLength, byte[] dSourceBuffer, int dSourceBufferLength, out uint dDestinationSize);[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]public static extern IntPtr LocalAlloc(int uFlags, IntPtr sizetdwBytes);[DllImport("kernel32.dll", SetLastError = true)]public static extern IntPtr LocalFree(IntPtr hMem);
public static byte[] ntdllCompress(byte[] buffer){var outBuf = new byte[buffer.Length * 6];uint dwSize = 0, dwRet = 0;uint ret = RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1 | COMPRESSION_ENGINE_MAXIMUM, out dwSize, out dwRet);if (ret != 0) return null;int dstSize = 0;IntPtr hWork = LocalAlloc(0, new IntPtr(dwSize));ret = RtlCompressBuffer(COMPRESSION_FORMAT_LZNT1 | COMPRESSION_ENGINE_MAXIMUM, buffer, buffer.Length, outBuf, outBuf.Length, 0, out dstSize, hWork);if (ret != 0) return null;LocalFree(hWork);Array.Resize(ref outBuf, dstSize);return outBuf;}
ntdll解压
public static byte[] ntdllDecompress(byte[] buffer){var outBuf = new byte[buffer.Length * 6];uint dwSize = 0, dwRet = 0;uint ret = RtlGetCompressionWorkSpaceSize(COMPRESSION_FORMAT_LZNT1, out dwSize, out dwRet);if (ret != 0) return null;ret = RtlDecompressBuffer(COMPRESSION_FORMAT_LZNT1, outBuf, outBuf.Length, buffer, buffer.Length, out dwRet);if (ret != 0) return null;Array.Resize(ref outBuf, (Int32)dwRet);return outBuf;}
