Base64InputStream.skip skips underlying stream, not output

Base64InputStream.skip() skips within underlying stream, leading to unexpected behaviour.

The following code will reproduce the issue:

@Test
public void testSkip() throws Throwable {
InputStream ins =
new ByteArrayInputStream("AAAA////".getBytes("ISO-8859-1"));//should decode to

{0, 0, 0, 255, 255, 255}

Base64InputStream instance = new Base64InputStream(ins);
assertEquals(3L, instance.skip(3L)); //should skip 3 decoded characters, or 4 encoded characters
assertEquals(255, instance.read()); //Currently returns 3, as it is decoding "A/", not "//"
}

The following code, if added to Base64InputStream, or (BaseNCodecInputStream in the dev build) would resolve the issue:

@Override
public long skip(long n) throws IOException {
//delegate to read()
long bytesRead = 0;
while ((bytesRead < n) && (read() != -1))

{ bytesRead++; }

return bytesRead;
}

More efficient code may be possible.