I have a Base64 string that's been gzipped in .NET and I would like to convert it back into a string in Java. I'm looking for some Java equivalents to the C# syntax, particularly:
Here's the method I'd like to convert:
public static string Decompress(string zipText) {
byte[] gzipBuff = Convert.FromBase64String(zipText);
using (MemoryStream memstream = new MemoryStream())
{
int msgLength = BitConverter.ToInt32(gzipBuff, 0);
memstream.Write(gzipBuff, 4, gzipBuff.Length - 4);
byte[] buffer = new byte[msgLength];
memstream.Position = 0;
using (GZipStream gzip = new GZipStream(memstream, CompressionMode.Decompress))
{
gzip.Read(buffer, 0, buffer.Length);
}
return Encoding.UTF8.GetString(buffer);
}
}
Any pointers are appreciated.
For Base64, you have the Base64
class from Apache Commons, and the decodeBase64
method which takes a String
and returns a byte[]
.
Then, you can read the resulting byte[]
into a ByteArrayInputStream
. At last, pass the ByteArrayInputStream
to a GZipInputStream and read the uncompressed bytes.
The code looks like something along these lines:
public static String Decompress(String zipText) throws IOException {
byte[] gzipBuff = Base64.decodeBase64(zipText);
ByteArrayInputStream memstream = new ByteArrayInputStream(gzipBuff);
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");
}
I didn't test the code, but I think it should work, maybe with a few modifications.