Compressed Array Bytes Java from .NET Webservice

Question

1 - From a webservice. NET 2008 (vb), I have a method that returns an array of bytes, the byte array is actually a string "Hola Mundo" ("Hello World" in English) compressed with the Class of System.IO.Compression GZipStream.

2 - The method returns the string "Hola Mundo" compressed, and this is what the webservice returns:

<base64Binary>
H4sIAAAAAAAEAO29B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Ir5dlVn6xXo5q/4f0m5DIgoAAAA=
</base64Binary>

3 - if I do a test from a windows application from Visual Basic. NET to run this method returns me this string and Unzip with another function I have, it brings me the "Hola Mundo" ....

4 - On Android (Eclipse) and I managed to make the request and bring me the previous string ... but do not know how to decompress and show me "Hola Mundo" ...

5 - I have tried several codes from the web, but none work.

anyone know anything about this? thank you very much from now.

Greetings.

Answer 1

If Android supports java.util.zip.GZIPInputStream, that's what you want.

For example:

byte[] bytes = getBytesFromWebService();
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
GZIPInputStream gzip = new GZIPInputStream(bais);
try {
  InputStreamReader reader = new InputStreamReader(gzip, "UTF-8");
  try {
    String firstLine = new BufferedReader(reader).readLine();
    ...
  } finally {
    reader.close();
  }
} finally {
  gzip.close();
}

Answer 2

I can't comment on Android, but you just need to:

• reverse the base-64
• reverse the gzip
• decode the string (presumably as UTF8)

In C#, this would be something like:

string base64 = "H4sIAAAAAAAEAO29B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Ir5dlVn6xXo5q/4f0m5DIgoAAAA=";
byte[] blob = Convert.FromBase64String(base64);
string orig;
using (var ms = new MemoryStream(blob))
using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
using (var reader = new StreamReader(gzip))
{
    orig = reader.ReadToEnd(); // Hola Mundo
}