用SharpZipLib里面的BZip2压缩和解压

ICSharpCode.SharpZipLib 类库可以从这里下载。

这几天在搜索关于C#的BZip2压缩和解压代码时候发现很多时候是这个zhuweisky 博客里面的

后来又出了修正版本 利用BZip2.Compress,BZip2.Decompress 实现

但是我发现用BZip2OutputStream和BZip2InputStream 实现,解压时候出现只能解压一部分数据

经过调试其实是代码没有完全用正确.

之前的代码

public static class ZipHelper
    {
        public static byte[] Zip(byte[] data)
        {
            MemoryStream mstream = new MemoryStream();
            BZip2OutputStream zipOutStream = new BZip2OutputStream(mstream);
            zipOutStream.Write(data, 0, data.Length);
            zipOutStream.Finalize();
            zipOutStream.Close();

            byte[] result = mstream.ToArray();
            mstream.Close();

            return result;
        }

        public static byte[] Unzip(byte[] data)
        {
            MemoryStream mstream = new MemoryStream(data);
            BZip2InputStream zipInputStream = new BZip2InputStream(mstream);
            byte[] byteUncompressed = new byte[zipInputStream.Length];
            zipInputStream.Read(byteUncompressed, 0, (int)byteUncompressed.Length);

            zipInputStream.Close();
            mstream.Close();

            return byteUncompressed;
        }
    }

修改后的

    class ZipHelper
    {
        public static byte[] Zip(byte[] data)
        {
            MemoryStream mstream = new MemoryStream();
            BZip2OutputStream zipOutStream = new BZip2OutputStream(mstream);
            zipOutStream.Write(data, 0, data.Length);
            zipOutStream.Close();
            byte[] result = mstream.ToArray();
            mstream.Close();
            return result;
        }
        public static byte[] Unzip(byte[] data)
        {
            MemoryStream mstream = new MemoryStream(data);
            BZip2InputStream zipInputStream = new BZip2InputStream(mstream);
            StreamReader readstream = new StreamReader(zipInputStream,Encoding.Default);
            String unzipdata = readstream.ReadToEnd();

            zipInputStream.Close();
            mstream.Close();
            return Encoding.Default.GetBytes(unzipdata);
        }
        
        
    }

解压时候也要注意下跟压缩的时候的编码对应.