C#如何实现zlib压缩和解压缩？

linchenrr 2011-01-05 06:41:44

注意不是GZip或Zip之类的，是zlib，需要和flash的zlib算法胡同。 SharpZipLib，不支持这个，试过zlib.NET，压缩可以但是解压缩某些特定的文件时出来的字节不对，貌似有bug，请问还有没有C#的zlib库？或者是我的代码有什么问题吗？





                    String path = @"C:\\1.xls";

                    FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read);

                    FileStream output;



                    Byte[] bytes;



                    



                    if (compress)

                    {

                        //压缩

                        bytes = new Byte[fs.Length];

                        fs.Read(bytes, 0, bytes.Length);



                        fs.Close();

                        fs.Dispose();



                        output = new FileStream(path, FileMode.Create, FileAccess.ReadWrite);



                        

                        ZOutputStream zOut = new ZOutputStream(output, zlibConst.Z_DEFAULT_COMPRESSION);

                        zOut.Write(bytes, 0, bytes.Length);

                        zOut.finish();

                        zOut.Close();

                    }

                    else

                    {

                        //解压缩

                        bytes = new Byte[0];



                        ZInputStream zIn = new ZInputStream(fs);

                        

                        int curPosition=0;



                        Byte[] data = new Byte[4096];



                        while (true)

                        {

                            int size = zIn.Read(data, 0, data.Length);

                            if (size > 0)

                            {

                                curPosition += size;

                                Byte[] tempBytes = new Byte[bytes.LongLength + data.Length];



                                bytes.CopyTo(tempBytes, 0);

                                data.CopyTo(tempBytes, bytes.LongLength);



                                bytes = tempBytes;

                                

                            }

                            else

                            {

                                break;

                            }

                        }



                       

                        fs.Close();

                        fs.Dispose();



                        output = new FileStream(path, FileMode.Create, FileAccess.ReadWrite);



                        output.Write(bytes, 0, curPosition);

                        output.Flush();



                    }



                    output.Close();

                    output.Dispose();