C # file stream compression and decompression

C # file stream compression and decompression

////// Decompress the file stream ///Public class ZipHelper {public static int BEST_COMPRESSION = 9; public static int BEST_SPEED = 1; public static int DEFAULT_COMPRESSION =-1; public static int NO_COMPRESSION = 0; # region Deflate compression ////// Deflate compression (the highest compression level by default )/////////
 Public static Stream Deflate (Stream stream) {return ZipHelper. Deflate (Stream, ZipHelper. DEFAULT_COMPRESSION );}////// Deflate compression /////////Compression Quality level (0 ~ 9 )///
 Public static Stream Deflate (Stream stream, int level) {byte [] array = ZipHelper. streamToBytes (stream); byte [] array2 = new byte [array. length]; Deflater deflater = new Deflater (); deflater. setLevel (level); deflater. setStrategy (DeflateStrategy. default); deflater. setInput (array); deflater. finish (); int num = deflater. deflate (array2); byte [] array3 = new byte [num]; Array. copy (array2, array3, num); return ZipHelper. bytesToStream (array3 );}////// Deflate compression /////////Compression Quality level (0 ~ 9 )///
 Public static byte [] Deflate (byte [] input, int level) {byte [] result; try {if (input = null & input. length = 0) {result = new byte [0];} else {byte [] array = new byte [input. length]; Deflater deflater = new Deflater (); deflater. setLevel (level); deflater. setStrategy (DeflateStrategy. default); deflater. setInput (input); deflater. finish (); int num = deflater. deflate (array); byte [] array2 = new byt E [num]; Array. Copy (array, array2, num); result = array2 ;}} catch (Exception innerException) {throw new Exception (compression program error !, InnerException);} return result ;}# endregion # region Inflate unzip ////// Inflate unzip the package /////////
 Public static byte [] Inflate (byte [] input) {byte [] result; try {if (input = null & input. length = 0) {result = new byte [0];} else {Inflater inflater = new Inflater (); inflater. setInput (input); byte [] array = new byte [1024]; using (MemoryStream memoryStream = new MemoryStream () {for (int I = inflater. inflate (array, 0, array. length); I> 0; I = inflater. inflate (array, 0, array. length) {me MoryStream. write (array, 0, I);} byte [] buffer = memoryStream. getBuffer (); memoryStream. close (); result = buffer ;}} catch (Exception innerException) {throw new Exception (decompression program error !, InnerException);} return result ;}////// Inflate unzip the package /////////
 Public static Stream Inflate (Stream zipStream) {byte [] input = ZipHelper. streamToBytes (zipStream); byte [] bytes = ZipHelper. inflate (input); return ZipHelper. bytesToStream (bytes);} # endregion # region GZip compression ////// GZip compression /////////Public static void GZipCompress (Stream srcStream, Stream output) {ZipHelper. GZipCompress (srcStream, 6, output );}////// GZip compression /////////Compression Quality level (0 ~ 9 )///Public static void GZipCompress (Stream srcStream, int compressLevel, Stream output) {if (compressLevel <1 | compressLevel> 9) {throw new Exception (string. format (the compression level {0} You specified is not in the valid range (1-9), compressLevel);} srcStream. position = 0L; GZipOutputStream gZipOutputStream = new GZipOutputStream (output); gZipOutputStream. setLevel (compressLevel); try {int I = 4096; byte [] buffer = new byte [I]; while (I> 0) {I = srcStream. read (buffer, 0, I); gZipOutputStream. write (buffer, 0, I) ;}} catch (Exception ex) {throw new Exception (GZip compression error: + ex. message);} srcStream. close (); gZipOutputStream. finish ();}////// Decompress GZip /////////Public static void GZipDeCompress (Stream zipStream, Stream outputStream) {GZipInputStream gZipInputStream = new GZipInputStream (zipStream); try {int I = 4096; byte [] buffer = new byte [I]; while (I> 0) {I = gZipInputStream. read (buffer, 0, I); outputStream. write (buffer, 0, I) ;}} catch (Exception ex) {throw new Exception (GZip decompression error: + ex. message);} zipStream. close (); gZipInputStream. close () ;}# endregion # region BZip2 compression ////// BZip2 compression ////////////Public static void BZip2Compress (Stream inStream, Stream outStream, int blockSize) {BZip2.Compress (inStream, outStream, blockSize );}////// Decompress BZip2 /////////Public static void BZip2Decompress (Stream inStream, Stream outStream) {BZip2.Decompress (inStream, outStream) ;}# endregion private static byte [] StreamToBytes (Stream stream) {byte [] array = new byte [stream. length]; stream. seek (0L, SeekOrigin. begin); stream. read (array, 0, array. length); stream. close (); return array;} private static Stream BytesToStream (byte [] bytes) {return new MemoryStream (bytes);} private static void StreamToFile (Stream stream, string fileName) {byte [] array = new byte [stream. length]; stream. read (array, 0, array. length); stream. seek (0L, SeekOrigin. begin); FileStream fileStream = new FileStream (fileName, FileMode. create); BinaryWriter binaryWriter = new BinaryWriter (fileStream); binaryWriter. write (array); binaryWriter. close (); fileStream. close ();} private static Stream FileToStream (string fileName) {FileStream fileStream = new FileStream (fileName, FileMode. open, FileAccess. read, FileShare. read); byte [] array = new byte [fileStream. length]; fileStream. read (array, 0, array. length); fileStream. close (); return new MemoryStream (array );}}