converter.java

Program helping you to remember the route. It cab be route from conference room to coffee-room, it

public class Converter {
    static final String ENCODING = "UTF-8";

    static void packInt(byte[] arr, int offs, int x) { 
        arr[offs] = (byte)(x >> 24);
        arr[offs+1] = (byte)(x >> 16);
        arr[offs+2] = (byte)(x >> 8);
        arr[offs+3] = (byte)x;
    }

    static int unpackInt(byte[] arr, int offs) { 
        return (arr[offs] << 24) | ((arr[offs+1] & 0xFF) << 16) | ((arr[offs+2] & 0xFF) << 8) | (arr[offs+3] & 0xFF);
    }

    static void packLong(byte[] arr, int offs, long x) { 
        packInt(arr, offs, (int)(x >> 32));
        packInt(arr, offs+4, (int)x);
    }

    static long unpackLong(byte[] arr, int offs) { 
        return ((long)unpackInt(arr, offs) << 32) | (unpackInt(arr, offs+4) & 0xFFFFFFFFL);
    }

    static byte[] packString(String str) { 
        try { 
            return str.getBytes(ENCODING);
        } catch (java.io.UnsupportedEncodingException x) { 
            return str.getBytes();
        }
    }
    
    static String unpackString(byte[] arr, int offs, int len) { 
        try { 
            return new String(arr, offs, len, ENCODING);
        } catch (java.io.UnsupportedEncodingException x) { 
            return new String(arr, offs, len);
        }
    }

    static void twoDigits(StringBuffer buf, int val) { 
        buf.append((char)('0' + val / 10));
        buf.append((char)('0' + val % 10));
    }

    static String timeToString(int time) { 
        StringBuffer buf = new StringBuffer();
        int seconds = time % 60;
        int minutes  = time / 60 % 60;
        int hours = time / 3600 % 24;
        int days = time / (3600*24);
        if (days != 0) { 
            buf.append(days);
            buf.append(' ');
            twoDigits(buf, hours);
            buf.append(':');
            twoDigits(buf, minutes);
        } else {  
            twoDigits(buf, hours);
            buf.append(':');
            twoDigits(buf, minutes);
            buf.append(':');
            twoDigits(buf, seconds);
        }
        return buf.toString();
    }
}