Compression helper class for compressing text, bytes, or files

Using system;using system.collections.generic;using system.text;using system.diagnostics;using System.IO;using Microsoft.win32;using system.io.compression;using System.runtime.serialization.formatters.binary;namespace        aimscommon{//<summary>//Compressed text, byte or file compression helper class///</summary> public class Gziphelper {        <summary>///Compressed strings///</summary>//<param name= "text" ></param> <returns></returns> public static string Compress (string text) {//Convert Tex            T to bytes byte[] buffer = Encoding.UTF8.GetBytes (text);            Get a stream MemoryStream ms = new MemoryStream ();            Get ready-to-zip up our stream using (GZipStream zip = new GZipStream (MS, Compressionmode.compress, true)) {//compress the data into our buffer zip. Write (buffer, 0, buffer.            Length);           } Reset our position in compressed stream to the start Ms.            Position = 0; Get the compressed data byte[] Compressed = Ms.            ToArray (); Ms. Read (compressed, 0, compressed.            Length); Prepare final data with header that indicates length byte[] gzbuffer = new byte[compressed.            Length + 4]; Copy compressed data 4 bytes from start of final header System.Buffer.BlockCopy (compressed, 0, Gzbuffer, 4, C Ompressed.            Length); Copy header to first 4 bytes System.Buffer.BlockCopy (bitconverter.getbytes (Buffer.            Length), 0, Gzbuffer, 0, 4);        Convert back to string and return return convert.tobase64string (Gzbuffer); }///<summary>//Extract strings///</summary>//<param name= "Compressedtext" &GT;&L        t;/param>//<returns></returns> public static string uncompress (String compressedtext)      {      Get string as bytes byte[] Gzbuffer = convert.frombase64string (Compressedtext);            Prepare stream to do uncompression MemoryStream ms = new MemoryStream ();            Get the length of compressed data int msglength = Bitconverter.toint32 (gzbuffer, 0); Uncompress everything besides the header Ms.            Write (Gzbuffer, 4, gzbuffer.length-4);            Prepare final buffer for just uncompressed data byte[] buffer = new Byte[msglength]; Reset our position on stream since we ' re starting over Ms.            Position = 0;            Unzip the data through stream gzipstream zip = new GZipStream (MS, compressionmode.decompress); Do the unzip zip. Read (buffer, 0, buffer.            Length);        Convert back to string and return return Encoding.UTF8.GetString (buffer); } public static T gzip<t> (stream stream, Compressionmode mode) where T:stream {byte[] writedata = new byte[4096];            T ms = default (t);                    using (Stream sg = new GZipStream (stream, mode)) {while (true) {                    Array.clear (writedata, 0, writedata.length); int size = sg.                    Read (writedata, 0, writedata.length); if (Size > 0) {Ms.                    Write (writedata, 0, size);                    } else {break;            }} return MS; }}///<summary>//Compressed Bytes///</summary>//<param name= "Bytdata" >&            lt;/param>//<returns></returns> public static byte[] Compress (byte[] bytdata) {    using (MemoryStream stream = gzip<memorystream> (new MemoryStream (Bytdata), compressionmode.compress))        {return stream.            ToArray (); }}///<summary>//Extract bytes///</summary>//<param name= "Bytdata" >&            lt;/param>//<returns></returns> public static byte[] Decompress (byte[] bytdata) {            using (MemoryStream stream = gzip<memorystream> (new MemoryStream (Bytdata), compressionmode.decompress)) {return stream.            ToArray (); }}///<summary>//Compressed file///</summary>//<param name= "SourceFile" &G t; source file </param>///<param Name= "destinationfile" > destination file </param> public static void Compressfi                Le (String sourcefile, String destinationfile) {if (file.exists (sourcefile) = = false)//determine if the file exists            throw new FileNotFoundException (); if (file.exists (destinationfile) = = false)//determine if the target file file exists Filehelper.deletefIle (Destinationfile);            Create file stream and byte array byte[] buffer = NULL;            FileStream sourcestream = null;            FileStream destinationstream = null;            GZipStream compressedstream = null;                 try {sourcestream = new FileStream (sourcefile, FileMode.Open, FileAccess.Read, FileShare.Read);                Buffer = new Byte[sourcestream.length]; Store the file stream into a byte array of int checkcounter = sourcestream.read (buffer, 0, buffer.                Length); if (checkcounter! = buffer.                Length) {throw new ApplicationException ();                } Destinationstream = new FileStream (Destinationfile, FileMode.OpenOrCreate, FileAccess.Write); Create GZipStream instance, write compressed file stream compressedstream = new GZipStream (Destinationstream, Compressionmode.compres                s, true); Compressedstream.write (buffer, 0, buffer.)            Length); } finally           {//Make sure we allways close all streams if (sourcestream! = null)                {Sourcestream.close ();}                if (compressedstream! = null) {Compressedstream.close ();}            if (destinationstream! = null) {Destinationstream.close ();} }}///<summary>//Unzip the file///</summary>//<param name= "SourceFile" &G t; source file </param>///<param Name= "destinationfile" > destination file </param> public static void decompress File (String sourcefile, String destinationfile) {if (!            File.exists (sourcefile)) {throw new FileNotFoundException ();            } FileStream stream = null;            FileStream stream2 = null;            GZipStream stream3 = null;            byte[] buffer = NULL; try {stream = new FileStream (sourcefile, Filemode.open);                STREAM3 = new GZipStream (stream, compressionmode.decompress, true);                Buffer = new BYTE[4]; int num = ((int) stream.                Length)-4; Stream.                Position = num; Stream.                Read (buffer, 0, 4); Stream.                Position = 0L;                byte[] Buffer2 = new Byte[bitconverter.toint32 (buffer, 0) + 100];                int offset = 0;                int count = 0; while (true) {int num5 = stream3.                    Read (buffer2, offset, 100);                    if (NUM5 = = 0) {break;                    } offset + = NUM5;                Count + = NUM5;                } stream2 = new FileStream (destinationfile, FileMode.Create); Stream2.                Write (buffer2, 0, Count); Stream2.            Flush ();           } finally {if (stream! = null) {         Stream.                Close (); } if (stream3! = null) {stream3.                Close (); } if (stream2! = null) {stream2.                Close (); }            }        }    }}

Compression helper class for compressing text, bytes, or files