static void putBytesFromLong(long i, final int offset, int size, final byte[] buf)
    {
        long q;
        int r;
        int charPos = offset + size;
        char sign = 0;

        if (i < 0)
        {
            sign = '-';
            i = -i;
        }

        // Get 2 digits/iteration using longs until quotient fits into an int
        while (i > Integer.MAX_VALUE)
        {
            q = i / 100;
            // really: r = i - (q * 100);
            r = (int) (i - ((q << 6) + (q << 5) + (q << 2)));
            i = q;
            buf[--charPos] = (byte) DigitOnes[r];
            buf[--charPos] = (byte) DigitTens[r];
        }

        // Get 2 digits/iteration using ints
        int q2;
        int i2 = (int) i;
        while (i2 >= 65536)
        {
            q2 = i2 / 100;
            // really: r = i2 - (q * 100);
            r = i2 - ((q2 << 6) + (q2 << 5) + (q2 << 2));
            i2 = q2;
            buf[--charPos] = (byte) DigitOnes[r];
            buf[--charPos] = (byte) DigitTens[r];
        }

        // Fall thru to fast mode for smaller numbers
        // assert(i2 <= 65536, i2);
        for (;;)
        {
            q2 = (i2 * 52429) >>> (16 + 3);
            r = i2 - ((q2 << 3) + (q2 << 1)); // r = i2-(q2*10) ...
            buf[--charPos] = (byte) digits[r];
            i2 = q2;
            if (i2 == 0)
                break;
        }
        if (sign != 0)
        {
            buf[--charPos] = (byte) sign;
        }
    }
From {@link java.lang.Integer#toString(int)}
protostuff-api/src/main/java/io/protostuff/StringSerializer.java