GZipStream 进行 gzip 压缩但解压缩文件以 "Unexpected end of data" 结尾

Question

有人知道为什么我在解压缩 gzip 文件时收到 "Unexpected end of data" 错误消息吗？

为了验证字节数据没有损坏，我使用 FooTest4.csv 写入文件并且能够成功打开文件。

两个'FooTest3.csv.gzand 'FooTest2.csv.gz 运行在解压缩时变成"Unexpected end of data"。

    public static List<byte> CompressFile(List<byte> parmRawBytes)
    {
        //Initialize variables...
        List<byte> returnModifiedBytes = null;

        File.WriteAllBytes(@"X:\FooTest4.csv", parmRawBytes.ToArray());

        using (var memoryStream = new MemoryStream())
        {
            using (var gzipStream = new GZipStream(memoryStream, CompressionMode.Compress, false))
            {
                gzipStream.Write(parmRawBytes.ToArray(), 0, parmRawBytes.ToArray().Length);
                gzipStream.Flush();
                File.WriteAllBytes(@"X:\FooTest3.csv.gz", memoryStream.ToArray());
                returnModifiedBytes = memoryStream.ToArray().ToList();
            }
        }

        File.WriteAllBytes(@"X:\FooTest2.csv.gz", returnModifiedBytes.ToArray());

        return returnModifiedBytes;
    }

Answer 1

您可以同时进行压缩和写入，而不是加载字节、压缩和保存它们。另外我不知道你为什么使用 List<Byte> 而不是 byte[]，也许就是这样。

void CompressFile(string inputPath, string outputPath)
{
   Stream readStream = new FileStream(inputPath, Filemode.Open);
   Stream writeStream = new FileStream(outputPath, FileMode.Create);
   Stream compressionStream = new GZipStream(writeStream. CompressionMode.Compress);
   byte[] data = new byte[readStream.Length];
   readStream.Read(data, 0, data.Length);
   compressionStream.Write(data, 0, data.Length);
   readStream.Close();
   writeStream.Close();    
}

byte[] CompressFile(string inputPath)
{
  byte[] data = File.ReadAllBytes(inputPath);
  MemoryStream memStream = new MemoryStream(data);
  var gzipStream = new GZipStream(memStream, CompressionMode.Compress);
  gzipStream.Write(data, 0, data.Length);
  gzipStream.Close();
  return gzipStream.ToArray();
}

PS: 我是用文本编辑器写的代码，所以可能会有错误。另外你说错误在"unzippiing"，为什么不告诉我们解压码？

Answer 2

需要关闭 GZipStream，以便它可以将一些终止数据写入缓冲区的末尾以完成 gzip 编码。

byte[] inputBytes = ...;
using (var compressedStream = new MemoryStream())
{
    using (var compressor = new GZipStream(compressedStream, CompressionMode.Compress))
    {
        compressor.Write(inputBytes, 0, inputBytes.Length);
    }

    // get bytes after the gzip stream is closed 
    File.WriteAllBytes(pathToFile, compressedStream.ToArray());
}

GZipStream 进行 gzip 压缩但解压缩文件以 "Unexpected end of data" 结尾

GZipStream does gzipping but ungzipping file end up with "Unexpected end of data"

c#

gzipstream