Re: Getting Applet into Flash ROM?

Hi Anguel,

Good point.  Converting the original binary data to a string can have a 
few pitfalls.  Java does lots of fancy character set conversions to make 
internationalization easy, but these can mess things up when all you 
want is the raw data.  I went through a lot of trial and error to find 
something that worked.  For example, you can do without the try{}catch{} 
block around the string declaration I posted before - it was left over 
from attempts to use different Java character encoding.

What I did in the end was use the default encoding and escape the 
characters that don't exist.  A code snippet for doing this, where "out" 
is some output stream and "in" is the input stream would be:

    c = in.read();
    while (c != -1) {
        // Things that need to be escaped
        if (c == '"') {
            out.write ('\\');
            out.write ('"');
        } else if (c == '\\') {
            out.write ('\\');
            out.write ('\\');
        } else if (c == '\n') {
            out.write ('\\');
            out.write ('n');
        } else if (c == '\r') {
            out.write ('\\');
            out.write ('r');
        } else {
            // Escape characters that don't fit in
            // ISO8859-1 encoding.
            if (((c & 0x0FF) >= 128) && ((c & 0x0FF) <= 159)) {
                out.write ('\\');
                out.write ('u');
                out.write ('0');
                out.write ('0');
                temp = (c & 0x0F0) >> 4;
                if (temp < 10) {
                    out.write (temp + '0');
                } else {
                    out.write (temp - 10 + 'A');
                }
                temp = c & 0x0F;
                if (temp < 10) {
                    out.write (temp + '0');
                } else {
                    out.write (temp - 10 + 'A');
                }
            } else {
                out.write ((byte)(c & 0x0FF));
            }
        }
        c = in.read();
    }

There may be a better way to do it, but the above has worked fine for me 
for a while.

Mark.

zer0flag wrote:

> Hi Mark!
>
> Thank you very much for your help! I like this approach! Maybe it's 
> not as elegant and efficient as the solution in assembler, but the 
> filesystem is built only once at startup so it should be enough for 
> most of us.
> I just wanted to ask you how you put the string into Java. Just copy 
> and paste from a text editor or do I have to make some special 
> preparations? What about encoding? Thanks once again for your help!
>
> Best regards,
> Anguel
>
> Mark Wolforth wrote:
>
>>
>> Hi,
>>
>> I've done this entirely in Java by storing the data as a string and 
>> then using the getBytes() method to extract the bytes back.  A String 
>> is the most data efficient way to do this in Java since all other 
>> array types add code to set up the array itself.  As an example, you 
>> could have a class like:
>>
>> class Web_applet {
>>    public byte[] JARfile;
>>    public web_applet() {
>>    try {
>>        JARfile = "­-Þd;o³õÃݶ¡¸Ç6ï´ÍÀ»l'bض\u0".getBytes();
>>    } catch (Throwable _) {}
>>    }
>> }
>>
>> and then extract the data with something like:
>>
>> private static final void CreateAppletJAR() {
>>    FileOutputStream jarfile;
>>    try {
>>        jarfile = new FileOutputStream (new File("Applet.jar"));
>>        Web_applet applet = new Web_applet();
>>        jarfile.write (applet.JARfile, 0, applet.JARfile.length);
>>        jarfile.close();
>>    } catch (Throwable t) {
>>        System.out.println ("Error creating web applet JAR file.");
>>        System.out.println (t);
>>    }
>> }  // End of CreateAppletJAR()
>>
>> Watch out for the 64K class limit size.  If you hit up against this 
>> you'll need to create multiple classes to hold your data.
>>
>> Good luck,
>> Mark.
>>
>>
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