v2

public static byte[] putint(int n)
{
    byte[] p = new byte[5];
    if(n<128 && n>-127) p[0] = (byte)n;
    else if(n<0x8000 && n>=-0x8000) { p[0] = (byte)0x80; p[1] = (byte)n; p[2] = (byte)(n>>>8); }
    else { p[0] = (byte)0x81; p[1] = (byte)n; p[2] = (byte)(n>>>8); p[3] = (byte)(n>>>16); p[4] = (byte)(n>>>24); }
    return p;
}

public static int getint(byte[] p)
{
    //int c = (char)p[0];
    if (p[0] == -128) { int n = p[1]; n |= (char)(p[2])<<<8; return n; }
    else if (p[0] == -127) { int n = p[1]; n |= p[2]<<<8; n |= p[3]<<<16; return n|(p[4]<<<24); }
    return p[0];
}