GZipStream和解压 [英] GZipStream and decompression

问题描述

我有一些代码应该做的压缩：

I have code that should do the compression:

        FileStream fs = new FileStream("g:\\gj.txt", FileMode.Open);
        FileStream fd = new FileStream("g:\\gj.zip", FileMode.Create);
        GZipStream csStream = new GZipStream(fd, CompressionMode.Compress);


        byte[] compressedBuffer = new byte[500];
        int offset = 0;
        int nRead;

        nRead = fs.Read(compressedBuffer, offset, compressedBuffer.Length);
        while (nRead > 0)
        {
            csStream.Write(compressedBuffer, offset, nRead);
            offset = offset + nRead;
            nRead = fs.Read(compressedBuffer, offset, compressedBuffer.Length);
        }


        fd.Close();
        fs.Close();

和我想这样做，但我想解什么压缩上述的方式。我somethink这样的：

and I think it does, but I want to decompress what was compressed the way above. I do somethink like that:

        FileStream fd = new FileStream("g:\\gj.new", FileMode.Create);
        FileStream fs = new FileStream("g:\\gj.zip", FileMode.Open);
        GZipStream csStream = new GZipStream(fs, CompressionMode.Decompress);

        byte[] decompressedBuffer = new byte[500];
        int offset = 0;
        int nRead;

        nRead=csStream.Read(decompressedBuffer, offset, decompressedBuffer.Length);
        while (nRead > 0)
        {
            fd.Write(decompressedBuffer, offset, nRead);
            offset = offset + nRead;
            nRead = csStream.Read(decompressedBuffer, offset, decompressedBuffer.Length);
        }

        fd.Close();
        fs.Close();

和这里不......我有NREAD = 0 befeore进入循环。 ..我做些什么错？
我使用的测试文件是simpliest文本文件（大小：104字节）...

and here it doesn't... I've got nRead = 0 befeore entering the loop... What I do wrong?? The test file I use is the simpliest TEXT file (size: 104 bytes)...

推荐答案

我的第一个想到的是，你还没有关闭 csStream 。如果你使用使用自动发生这种情况。由于gzip的缓冲区的数据，你可能会缺少一些

My first thought is that you haven't closed csStream. If you use using this happens automatically. Since gzip buffers data, you could be missing some.

其次;不增加偏移;即在缓存（而不是流）的偏移量。离开在0：

Secondly; don't increment offset; that is the offset in the buffer (not the stream). Leave at 0:

using (Stream fs = File.OpenRead("gj.txt"))
using (Stream fd = File.Create("gj.zip"))
using (Stream csStream = new GZipStream(fd, CompressionMode.Compress))
{
    byte[] buffer = new byte[1024];
    int nRead;
    while ((nRead = fs.Read(buffer, 0, buffer.Length))> 0)
    {
        csStream.Write(buffer, 0, nRead);
    }
}

using (Stream fd = File.Create("gj.new.txt"))
using (Stream fs = File.OpenRead("gj.zip"))
using (Stream csStream = new GZipStream(fs, CompressionMode.Decompress))
{
    byte[] buffer = new byte[1024];
    int nRead;
    while ((nRead = csStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fd.Write(buffer, 0, nRead);
    }
}

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