New to Java

I know there has to be a better way for me to do this. I have an inputstream that is being updated from a connection to a server and as it is read it is converted to char's and put into a StringBuffer. From the StringBuffer I look for the ESC character or ASCII #27. When I find that character I pass a substring on to another method to look though and remove the text before that from the stringbuffer. In the substring I search for 'm', the terminating character, if it isn't found I haven't done anything yet (I have no idea but it will pass it back to the be added to the display). In that substring I extract the numbers after checking if ther is a simicolon in it (signifing more than one number in the code) and according to what I find I set the color (ExtraColor is just Java.awt.Color with an extra field for boolean isBold).

The problem with the current one is I know it contains a few wtf's and it sometimes leaves the 'm' behind and doesn't always get the color right. Would someone look though it and see where I've gone wrong? I know this is terribly long explanation and thank you for reading it.

    private void manageColor()
    {
        boolean done = false;
        while(!done)
        {
            int index = sb.indexOf(char27.toString()+ "[");
            if(index != 0)
            {
                StringBuffer temp = new StringBuffer(sb.substring(0,index));
                cf.appendDisplay(temp.toString());
                System.err.println(temp.toString());
            }
            sb = new StringBuffer(sb.substring(index));
            if(debug) System.err.println("Color: " + sb.substring(2,sb.indexOf("m")+1));
            extraColor col = findColor(sb.substring(2,sb.indexOf("m")+1).toString());
            if(col == null)
                cf.resetColor();
            else if(col.isBright)
                cf.boldColor(col.toColor());
            else
                cf.setColor(col.toColor());
            //cut off last set of char27 [#;##
            sb = new StringBuffer(sb.substring(sb.indexOf("m")));
            if(sb.indexOf(char27.toString()+ "[") == -1)
            {
                done = true;
                cf.appendDisplay(sb.toString());
            }
            if(!done)
                //safe to cut off m
                sb = new StringBuffer(sb.substring(1));
        }
    }

    private extraColor findColor(String escape)
    {
        boolean isSimicolened = false;
        boolean bold = false;
        int color;
        extraColor col;
        for(int i = 0; i<escape.length(); i++)
        {
            if(escape.charAt(i) == ';')
                isSimicolened = true;
        }
        if(!isSimicolened)
        {
            if(debug) System.err.println("\tescape: "+escape);
            color = extractNum(escape);
        }
        else
        {
            if(debug) System.err.println("\tescape: "+escape);
            bold = (escape.charAt(0) == '0') ? false : true;
            color = extractNum(escape.substring(2));
        }
        switch (color)
        {
            case 0:
                col = null; //means revert to previous color
                break;
            case 30:
                col = new extraColor(Color.GRAY, bold);     //nonstandard, but nessecary
                break;
            case 31:
                col = new extraColor(Color.RED, bold);
                break;
            case 32:
                col = new extraColor(Color.GREEN, bold);
                break;
            case 33:
                col = new extraColor(Color.YELLOW, bold);
                break;
            case 34:
                col = new extraColor(Color.BLUE, bold);
                break;
            case 35:
                col = new extraColor(Color.MAGENTA, bold);
                break;
            case 36:
                col = new extraColor(Color.CYAN, bold);
                break;
            case 37:
                col = new extraColor(Color.WHITE, bold);
                break;
            case 39:
                col = new extraColor(Color.WHITE, bold);
                break;
            default:
                col = new extraColor(Color.WHITE);
        }
        return col;
    }
    private int extractNum(String seq)
    {
        StringBuilder value = new StringBuilder();
        for(int i = 0; i >< seq.length(); i++)
        {
            if(Character.isDigit(seq.charAt(i)))
                value.append(seq.charAt(i));
            if(seq.charAt(i) == 'm')
                i = 10; //always greater than seq.length
        }
        return Integer.parseInt(value.toString());
    }