可以的GZip COM pression（通过.NET）增加文件大小？ [英] Can GZip compression (via .net) increase file size?

问题描述

我跟踪我是COM pressing使用。NET的GZipStream类文件的原始大小，而且好像，我认为我是COM pressing的规模增加了文件。这可能吗？

这是我如何做COM pression：

 字节[]字节= GetFileBytes（文件）;

使用（的FileStream FILESTREAM =新的FileStream（Zipped.gz，FileMode.Create））
{
    使用（GZipStream zipStream =新GZipStream（FILESTREAM，COM pressionMode.Com preSS））
    {
        zipStream.Write（字节，0，bytes.Length）;
    }
}
 

解决方案

是的，它可以。它一直固定在.NET 4 。

  

在COM pression算法的System.IO.Com pression .. ::。DeflateStream和System.IO.Com pression .. ::。GZipStream类有这样的数据提高了已经融为一体pressed不再膨胀。这将导致更好的融为一体pression比率。此外，4 GB的大小限制COM pressing流已被删除。

检查：<一href="http://connect.microsoft.com/VisualStudio/feedback/details/93636/gzipstream-deflatestream-increase-file-size-on-com$p$pssion"相对=nofollow> GZipStream / DeflateStream增加文件的COM pression

另外，请在这里SO：<一href="http://stackoverflow.com/questions/3864055/gzipstream-and-deflatestream-produce-bigger-files">GZipStream和DeflateStream产生较大的文件

I keep track of the original size of the files that I'm compressing using .Net's GZipStream class, and it seems like the file that I thought I was compressing has increased in size. Is that possible?

This is how I'm doing the compression:

Byte[] bytes = GetFileBytes(file);

using (FileStream fileStream = new FileStream("Zipped.gz", FileMode.Create))
{
    using (GZipStream zipStream = new GZipStream(fileStream, CompressionMode.Compress))
    {
        zipStream.Write(bytes, 0, bytes.Length);
    }
}

解决方案

Yes, it can. It has been fixed in .NET 4.

The compression algorithms for the System.IO.Compression..::.DeflateStream and System.IO.Compression..::.GZipStream classes have improved so that data that is already compressed is no longer inflated. This results in much better compression ratios. Also, the 4-gigabyte size restriction for compressing streams has been removed.

Check: GZipStream/DeflateStream increase file size on compression

Also check here SO: GZipStream and DeflateStream produce bigger files

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