加载文件不起作用 - GZip标头中的幻数不正确

Question

我正在尝试创建一个Save/Load类,它具有保存和加载文件压缩文件的选项.以下是我到目前为止的情况.单步执行它似乎工作得很好,除了我得到"GZip标头中的幻数不正确"异常.我不明白这是怎么回事,因为我检查确保数字在我传递之前存在,并且我已经通过外部程序验证它是GZip文件.

任何协助找出我出错的地方将不胜感激.对我的代码的建设性批评总是受欢迎的 - 谢谢!

public static class SaveLoad
{
    public static void Save(string fileName, object savefrom, bool compress)
    {
        FileStream stream = new FileStream(fileName, FileMode.Create);

        BinaryFormatter formatter = new BinaryFormatter();
        if (compress)
        {
            GZipStream compressor = new GZipStream(stream, CompressionMode.Compress);
            formatter.Serialize(compressor, savefrom);
            compressor.Close();
        }
        else { formatter.Serialize(stream, savefrom); }

        stream.Close();
    }

    public static object Load(string fileName)
    {
        object loadedObject = null;

        try
        {
            FileStream stream = new FileStream(fileName, FileMode.Open);

            BinaryFormatter formatter = new BinaryFormatter();

            if (stream.Length > 4)
            {
                byte[] data = new byte[4];
                stream.Read(data, 0, 4);

                if (BitConverter.ToUInt16(data, 0) == 0x8b1f) //GZIP_LEAD_BYTES == 0x8b1f
                {
                    GZipStream decompressor = new GZipStream(stream, CompressionMode.Decompress);
                    loadedObject = formatter.Deserialize(decompressor); //Exception
                    decompressor.Close();
                }
                else { loadedObject = formatter.Deserialize(stream); }
            }
            stream.Close();
        }
        catch (Exception e)
        {
            Logger.StaticLog.AddEvent(new Logger.lEvent(null, Logger.lEvent.EventTypes.Warning, "Failed to load file: " + fileName, e)
            {
                SendingObject = "SaveLoad"
            });
            Logger.StaticLog.WriteLog();
            throw;
        }

        return loadedObject;
    }
}

Answer 1

似乎你在将流传递给解压缩器之前读取了幻数(因为你已经读过了它,因此它不会读取幻数).

stream.Seek(0,SeekOrigin.Begin)在解压缩之前使用.