VS2005下数据压缩方式

 

 

ICSharpCode提供了多种数据压缩的方式，下面实现了四种：BZip，Deflate，GZip，Zip,以便参考

 

  const int buffSize = 2048; //指定压缩块缓存的大小，一般为2048的倍数 /// <summary> /// BZIP2压缩数据 /// </summary> /// <param name="input">原始未压缩数据</param> /// <returns>压缩后的byte[]数据</returns> public byte[] BZipCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { //int buffSize = 2048;//指定压缩块的大小，一般为2048的倍数 using (MemoryStream outmsStrm = new MemoryStream()) { using (MemoryStream inmsStrm = new MemoryStream(input)) { BZip2.Compress(inmsStrm, outmsStrm, buffSize); } return outmsStrm.ToArray(); } } catch (Exception ex) { throw ex; } } /// <summary> /// 解压缩BZIP2数据 /// </summary> /// <param name="input">被BZIP2压缩过的byte[]数据</param> /// <returns>解压后的byte[]数据</returns> public byte[] BZipDeCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { using (MemoryStream outmsStrm = new MemoryStream()) { using (MemoryStream inmsStrm = new MemoryStream(input)) { BZip2.Decompress(inmsStrm, outmsStrm); } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// 压缩Deflater数据 /// </summary> /// <param name="input">待压缩byte[]数据</param> /// <returns>返回压缩后的byte[]</returns> public byte[] DeflaterCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { Deflater mDeflater = new Deflater(Deflater.BEST_COMPRESSION); //int buffSize = 2048;//131072 buff size using (MemoryStream outmsStrm = new MemoryStream()) { using (DeflaterOutputStream mStream = new DeflaterOutputStream(outmsStrm, mDeflater, buffSize)) { mStream.Write(input, 0, input.Length); } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// 解压缩Deflater数据 /// </summary> /// <param name="input">压缩过的byte[]数据</param> /// <returns>解压后的byte[]数据</returns> public byte[] DeflaterDeCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { Int32 mSize; //int buffSize = 2048; byte[] buff = new byte[buffSize]; using (MemoryStream outmsStrm = new MemoryStream()) { using (InflaterInputStream mStream = new InflaterInputStream(new MemoryStream(input))) { while (true) { mSize = mStream.Read(buff, 0, buff.Length); if (mSize > 0) { outmsStrm.Write(buff, 0, mSize); } else { break; } } } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// GZIP压缩 /// </summary> /// <param name="input">未压缩的数据</param> /// <returns>GZIP压缩后的数据</returns> public static byte[] GZipCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { using (MemoryStream outmsStrm = new MemoryStream()) { using (GZipOutputStream gzip = new GZipOutputStream(outmsStrm)) { gzip.Write(input, 0, input.Length); } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// GZIP解压缩 /// </summary> /// <param name="input">压缩过的数据</param> /// <returns>解压后的数据</returns> public static byte[] GZipDeCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { using (MemoryStream outmsStrm = new MemoryStream()) { using (GZipInputStream gzip = new GZipInputStream(new MemoryStream(input))) { Int32 mSize; //int buffSize = 2048; byte[] buff = new byte[buffSize]; while (true) { mSize = gzip.Read(buff, 0, buffSize); if (mSize > 0) { outmsStrm.Write(buff, 0, mSize); } else { break; } } } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// ZIP压缩数据 /// </summary> /// <param name="input">待压缩的数据</param> /// <returns>ZIP压缩后的数据</returns> public static byte[] ZipCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { using (MemoryStream outmsStrm = new MemoryStream()) { using (ZipOutputStream zipStrm = new ZipOutputStream(outmsStrm)) { ZipEntry zn = new ZipEntry("znName"); zipStrm.PutNextEntry(zn); zipStrm.Write(input, 0, input.Length); } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } } /// <summary> /// ZIP解压缩数据 /// </summary> /// <param name="input">压缩过的数据</param> /// <returns>解压后的数据</returns> public static byte[] ZipDeCompress(byte[] input) { if (input == null) { throw new ArgumentNullException("null input"); } try { using (MemoryStream outmsStrm = new MemoryStream()) { using (ZipInputStream zipStrm = new ZipInputStream(new MemoryStream(input))) { Int32 mSize; //int buffSize = 2048; byte[] buff = new byte[buffSize]; ZipEntry zn = new ZipEntry("znName"); while ((zn = zipStrm.GetNextEntry()) != null) { while (true) { mSize = zipStrm.Read(buff, 0, buffSize); if (mSize > 0) { outmsStrm.Write(buff, 0, mSize); } else { break; } } } } return outmsStrm.ToArray(); } } catch (Exception ex) { throw (ex); } }