package org.stevewinfield.sunrise.util;

public class WireEncoding {
	public static String encode(int i) { 
        byte[] wf = new byte[6]; 
        int pos = 0; 
        int startPos = pos; 
        int bytes = 1; 
        int negativeMask = i >= 0 ? 0 : 4; 
        i = Math.abs(i); 
        wf[pos++] = (byte)(64 + (i & 3)); 
        for (i >>= 2; i != 0; i >>= 6) { 
            bytes++; 
            wf[pos++] = (byte)(64 + (i & 0x3f)); 
        } 
        wf[startPos] = (byte)(wf[startPos] | bytes << 3 | negativeMask); 
        String tmp = new String(wf); 
        return tmp.replace("\0", ""); 
    } 
    public static int decode(String data, int total)  { 
        char[] chars; 
        chars = data.toCharArray(); 
        return decode(chars, total); 
    } 
    public static int decode(char[] raw, int total) { 
        try { 
        int pos = 0; 
        int v = 0;
        total = (raw[0] >> 3 & 7);
        boolean negative = (raw[pos] & 4) == 4; 
        int totalBytes = raw[pos] >> 3 & 7; 
        v = raw[pos] & 3; 
        pos++; 
        int shiftAmount = 2; 
        for (int b = 1; b < totalBytes; b++) { 
            v |= (raw[pos] & 0x3f) << shiftAmount; 
            shiftAmount = 2 + 6 * b; 
            pos++; 
        } 

        if (negative == true) 
            v *= -1; 
        return v; 
        } catch (Exception e) { 
            return 0; 
        }         
    }
}