Reading Strings and Binary from the same FileInputStream

Question

I have a file that contains some amount of plain text at the start followed by binary content at the end. The size of the binary content is determined by some one of the pla

Answer 1

Alas, DataInputStream is deprecated and does not handle UTF. But this should help (it reads a line from a binary stream, without any lookahead).

public static String lineFrom(InputStream in) throws IOException {
    byte[] buf = new byte[128];
    int pos = 0;
    for (;;) {
        int ch = in.read();
        if (ch == '\n' || ch < 0) break;
        buf[pos++] = (byte) ch;
        if (pos == buf.length) buf = Arrays.copyOf(buf, pos + 128);
    }
    return new String(Arrays.copyOf(buf, pos), "UTF-8");
}