Java decompressing array of bytes

Question

On server (C++), binary data is compressed using ZLib function:

compress2()

and it\'s sent over to client (Java). On client side (

Answer 1

I think the problem is not with unpack method but in packedBuffer content. Unpack works fine

public static byte[] pack(String s) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    DeflaterOutputStream dout = new DeflaterOutputStream(out);
    dout.write(s.getBytes());
    dout.close();
    return out.toByteArray();
}

public static void main(String[] args) throws Exception {
    byte[] a = pack("123");
    String s = unpack(a);   // calls your unpack
    System.out.println(s);
}

output

123

Answer 2

InflaterInputStream is expecting raw deflate data (RFC 1951), whereas compress2() is producing zlib-wrapped deflate data (RFC 1950 around RFC 1951).

Inflater on the other hand does process zlib-wrapped data (unless you give it the nowrap option). Go figure.