用Deflate流压缩/解压缩文件

Deflate流压缩

using System.IO;  using System.IO.Compression;  string sourceFile=@"C:\1.txt"；  string destinationFile=@"C:\1.bin";      private const long BUFFER_SIZE = 20480;         if ( File.Exists ( sourceFile ))         {              FileStream sourceStream = null;              FileStream destinationStream = null;              DeflateStream compressedStream = null;              try              {                  // Read the bytes from the source file into a byte array                  sourceStream = new FileStream ( sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read );                    // Open the FileStream to write to                  destinationStream = new FileStream ( destinationFile, FileMode.OpenOrCreate, FileAccess.Write );                    // Create a compression stream pointing to the destiantion stream                  compressedStream = new DeflateStream ( destinationStream, CompressionMode.Compress, true );              long bufferSize = sourceStream.Length < BUFFER_SIZE ? sourceStream.Length : BUFFER_SIZE;                 byte[] buffer = new byte[bufferSize];                 int bytesRead = 0;                 long bytesWritten = 0;                 while ((bytesRead = sourceStream.Read(buffer, 0, buffer.Length)) != 0)                 {                     compressedStream.Write(buffer, 0, bytesRead);                     bytesWritten += bufferSize;                 }                   }              catch ( ApplicationException ex )              {                  Console.WriteLine(ex.Message);              }              finally              {                  // Make sure we allways close all streams                  if ( sourceStream != null )                      sourceStream.Close ( );                    if ( compressedStream != null )                      compressedStream.Close ( );                    if ( destinationStream != null )                      destinationStream.Close ( );              }          }

Deflate流解压缩

using System.IO;  using System.IO.Compression;  string sourceFile=@"C:\1.bin";  string destinationFile=@"C:\1.txt";          private const long BUFFER_SIZE = 20480;              // make sure the source file is there              if (File.Exists ( sourceFile ))              {              FileStream sourceStream = null;              FileStream destinationStream = null;              DeflateStream decompressedStream = null;              byte[] quartetBuffer = null;              try              {                  // Read in the compressed source stream                  sourceStream = new FileStream ( sourceFile, FileMode.Open );                    // Create a compression stream pointing to the destiantion stream                  decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );                    // Read the footer to determine the length of the destiantion file                  quartetBuffer = new byte[4];                  int position = (int)sourceStream.Length - 4;                  sourceStream.Position = position;                  sourceStream.Read ( quartetBuffer, 0, 4 );                  sourceStream.Position = 0;                  int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );                    byte[] buffer = new byte[checkLength + 100];                    int offset = 0;                  int total = 0;                    // Read the compressed data into the buffer                  while ( true )                  {                      int bytesRead = decompressedStream.Read ( buffer, offset, 100 );                        if ( bytesRead == 0 )                          break;                        offset += bytesRead;                      total += bytesRead;                  }                    // Now write everything to the destination file                  destinationStream = new FileStream ( destinationFile, FileMode.Create );                  destinationStream.Write ( buffer, 0, total );                    // and flush everyhting to clean out the buffer                  destinationStream.Flush ( );              }              catch ( ApplicationException ex )              {                  Console.WriteLine(ex.Message, "解压文件时发生错误：");              }              finally              {                  // Make sure we allways close all streams                  if ( sourceStream != null )                      sourceStream.Close ( );                    if ( decompressedStream != null )                      decompressedStream.Close ( );                    if ( destinationStream != null )                      destinationStream.Close ( );              }              }