为什么GZip压缩算法的结果是不是在安卓和.Net一样吗？ [英] Why the result of GZip algorithm is not same in Android and .Net?

问题描述

为什么GZip压缩算法的结果是不一样的安卓和.Net？

Why the result of GZip algorithm is not same in Android and .Net?

我的code在机器人：

My code in android:

    public static String compressString(String str) {

    String str1 = null;
    ByteArrayOutputStream bos = null;
    try {
        bos = new ByteArrayOutputStream();
        BufferedOutputStream dest = null;

        byte b[] = str.getBytes();
        GZIPOutputStream gz = new GZIPOutputStream(bos, b.length);
        gz.write(b, 0, b.length);
        bos.close();
        gz.close();

    } catch (Exception e) {
        System.out.println(e);
        e.printStackTrace();
    }
    byte b1[] = bos.toByteArray();
    return Base64.encode(b1);
}

我的code。在.NET Web服务上：

My code in the .Net WebService:

    public static string compressString(string text)
{
    byte[] buffer = Encoding.UTF8.GetBytes(text);
    MemoryStream ms = new MemoryStream();
    using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true))
    {
        zip.Write(buffer, 0, buffer.Length);
    }

    ms.Position = 0;
    MemoryStream outStream = new MemoryStream();

    byte[] compressed = new byte[ms.Length];
    ms.Read(compressed, 0, compressed.Length);

    byte[] gzBuffer = new byte[compressed.Length + 4];
    System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);
    System.Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);
    return Convert.ToBase64String(gzBuffer);
}

在Android的：

compressString("hello"); -> "H4sIAAAAAAAAAMtIzcnJBwCGphA2BQAAAA=="

在净：

compressString("hello"); -> "BQAAAB+LCAAAAAAABADtvQdgHEmWJSYvbcp7f0r1StfgdKEIgGATJNiQQBDswYjN5pLsHWlHIymrKoHKZVZlXWYWQMztnbz33nvvvffee++997o7nU4n99//P1xmZAFs9s5K2smeIYCqyB8/fnwfPyLmeVlW/w+GphA2BQAAAA=="

有趣的是，当我使用 DECOM preSS 方式在Android中，以DECOM preSS净结果 COM pressString 方式，它正确返回原始字符串，但我得到的错误，当我DECOM preSS的结果机器人 COM pressedString 方式。

It is interesting that when I use Decompress method in android to decompress the result of .Net compressString method, it returns the original string correctly but I get error when I decompress the result of android compressedString method.

Android的DECOM preSS方式​​：

Android Decompress method:

    public static String Decompress(String zipText) throws IOException {
    int size = 0;
    byte[] gzipBuff = Base64.decode(zipText);

    ByteArrayInputStream memstream = new ByteArrayInputStream(gzipBuff, 4,
            gzipBuff.length - 4);
    GZIPInputStream gzin = new GZIPInputStream(memstream);

    final int buffSize = 8192;
    byte[] tempBuffer = new byte[buffSize];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    while ((size = gzin.read(tempBuffer, 0, buffSize)) != -1) {
        baos.write(tempBuffer, 0, size);
    }
    byte[] buffer = baos.toByteArray();
    baos.close();

    return new String(buffer, "UTF-8");
}

我认为有Android中的 COM pressString 方式错误。 任何人可以帮助我吗？

I think that there is an error in Android compressString method. Can anybody help me?

推荐答案

根据这个答案，我有4种方法。 Android和.NET COM preSS和DECOM preSS方法。这些方法是彼此相容除了一种情况

According to this answer, I have 4 methods. Android and .net compress and decompress methods. These methods are compatible with each other except in one case.

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