jaroslav@323: /**
jaroslav@323:  * Back 2 Browser Bytecode Translator
jaroslav@323:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@323:  *
jaroslav@323:  * This program is free software: you can redistribute it and/or modify
jaroslav@323:  * it under the terms of the GNU General Public License as published by
jaroslav@323:  * the Free Software Foundation, version 2 of the License.
jaroslav@323:  *
jaroslav@323:  * This program is distributed in the hope that it will be useful,
jaroslav@323:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@323:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@323:  * GNU General Public License for more details.
jaroslav@323:  *
jaroslav@323:  * You should have received a copy of the GNU General Public License
jaroslav@323:  * along with this program. Look for COPYING file in the top folder.
jaroslav@323:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@323:  */
jaroslav@323: package org.apidesign.bck2brwsr.launcher;
jaroslav@323: 
jaroslav@382: import java.io.Closeable;
jaroslav@365: import java.io.File;
jaroslav@331: import java.io.IOException;
jaroslav@323: import java.io.InputStream;
jaroslav@356: import java.io.InterruptedIOException;
jaroslav@323: import java.io.OutputStream;
jaroslav@323: import java.io.Writer;
jaroslav@323: import java.net.URI;
jaroslav@348: import java.net.URISyntaxException;
jaroslav@323: import java.net.URL;
jaroslav@348: import java.util.ArrayList;
jaroslav@361: import java.util.Arrays;
jaroslav@323: import java.util.Enumeration;
jaroslav@348: import java.util.LinkedHashSet;
jaroslav@348: import java.util.List;
jaroslav@348: import java.util.Set;
jaroslav@371: import java.util.concurrent.BlockingQueue;
jaroslav@342: import java.util.concurrent.CountDownLatch;
jaroslav@371: import java.util.concurrent.LinkedBlockingQueue;
jaroslav@349: import java.util.concurrent.TimeUnit;
jaroslav@362: import java.util.logging.Level;
jaroslav@362: import java.util.logging.Logger;
phrebejk@460: import org.apidesign.bck2brwsr.dew.Dew;
jaroslav@323: import org.apidesign.vm4brwsr.Bck2Brwsr;
jaroslav@323: import org.glassfish.grizzly.PortRange;
jaroslav@323: import org.glassfish.grizzly.http.server.HttpHandler;
jaroslav@323: import org.glassfish.grizzly.http.server.HttpServer;
jaroslav@323: import org.glassfish.grizzly.http.server.NetworkListener;
jaroslav@323: import org.glassfish.grizzly.http.server.Request;
jaroslav@323: import org.glassfish.grizzly.http.server.Response;
jaroslav@323: import org.glassfish.grizzly.http.server.ServerConfiguration;
jaroslav@323: 
jaroslav@323: /**
jaroslav@357:  * Lightweight server to launch Bck2Brwsr applications and tests.
jaroslav@357:  * Supports execution in native browser as well as Java's internal 
jaroslav@357:  * execution engine.
jaroslav@323:  */
jaroslav@382: final class Bck2BrwsrLauncher extends Launcher implements Closeable {
jaroslav@362:     private static final Logger LOG = Logger.getLogger(Bck2BrwsrLauncher.class.getName());
jaroslav@526:     private static final MethodInvocation END = new MethodInvocation(null, null, null);
jaroslav@348:     private Set<ClassLoader> loaders = new LinkedHashSet<>();
jaroslav@471:     private Set<Bck2Brwsr.Resources> xRes = new LinkedHashSet<>();
jaroslav@371:     private BlockingQueue<MethodInvocation> methods = new LinkedBlockingQueue<>();
jaroslav@349:     private long timeOut;
jaroslav@357:     private final Res resources = new Res();
jaroslav@382:     private final String cmd;
jaroslav@371:     private Object[] brwsr;
jaroslav@371:     private HttpServer server;
jaroslav@371:     private CountDownLatch wait;
jaroslav@382: 
jaroslav@382:     public Bck2BrwsrLauncher(String cmd) {
jaroslav@382:         this.cmd = cmd;
jaroslav@382:     }
jaroslav@348:     
jaroslav@382:     @Override
jaroslav@526:      MethodInvocation addMethod(Class<?> clazz, String method, String html) throws IOException {
jaroslav@348:         loaders.add(clazz.getClassLoader());
jaroslav@526:         MethodInvocation c = new MethodInvocation(clazz.getName(), method, html);
jaroslav@348:         methods.add(c);
jaroslav@371:         try {
jaroslav@371:             c.await(timeOut);
jaroslav@371:         } catch (InterruptedException ex) {
jaroslav@371:             throw new IOException(ex);
jaroslav@371:         }
jaroslav@348:         return c;
jaroslav@348:     }
jaroslav@348:     
jaroslav@349:     public void setTimeout(long ms) {
jaroslav@349:         timeOut = ms;
jaroslav@349:     }
jaroslav@348:     
jaroslav@357:     public void addClassLoader(ClassLoader url) {
jaroslav@357:         this.loaders.add(url);
jaroslav@357:     }
jaroslav@348: 
jaroslav@382:     public void showURL(String startpage) throws IOException {
jaroslav@371:         if (!startpage.startsWith("/")) {
jaroslav@371:             startpage = "/" + startpage;
jaroslav@371:         }
jaroslav@371:         HttpServer s = initServer();
jaroslav@371:         s.getServerConfiguration().addHttpHandler(new Page(resources, null), "/");
jaroslav@382:         try {
jaroslav@382:             launchServerAndBrwsr(s, startpage);
jaroslav@382:         } catch (URISyntaxException | InterruptedException ex) {
jaroslav@382:             throw new IOException(ex);
jaroslav@382:         }
jaroslav@371:     }
phrebejk@460:     
phrebejk@460:     public static void main(String... args) throws Exception {
phrebejk@460:         Bck2BrwsrLauncher l = new Bck2BrwsrLauncher(null);
jaroslav@465:         l.addClassLoader(Bck2BrwsrLauncher.class.getClassLoader());
phrebejk@460:         HttpServer s = l.initServer();
jaroslav@471:         final Dew dew = new Dew();
jaroslav@471:         s.getServerConfiguration().addHttpHandler(dew, "/dew/");
jaroslav@471:         l.xRes.add(dew);
phrebejk@460:         l.launchServerAndBrwsr(s, "/dew/");
phrebejk@460:         System.in.read();
phrebejk@460:     }
jaroslav@348: 
jaroslav@382:     @Override
jaroslav@371:     public void initialize() throws IOException {
jaroslav@356:         try {
jaroslav@371:             executeInBrowser();
jaroslav@356:         } catch (InterruptedException ex) {
jaroslav@356:             final InterruptedIOException iio = new InterruptedIOException(ex.getMessage());
jaroslav@356:             iio.initCause(ex);
jaroslav@356:             throw iio;
jaroslav@356:         } catch (Exception ex) {
jaroslav@356:             if (ex instanceof IOException) {
jaroslav@356:                 throw (IOException)ex;
jaroslav@356:             }
jaroslav@356:             if (ex instanceof RuntimeException) {
jaroslav@356:                 throw (RuntimeException)ex;
jaroslav@356:             }
jaroslav@356:             throw new IOException(ex);
jaroslav@356:         }
jaroslav@356:     }
jaroslav@356:     
jaroslav@357:     private HttpServer initServer() {
jaroslav@371:         HttpServer s = HttpServer.createSimpleServer(".", new PortRange(8080, 65535));
jaroslav@357: 
jaroslav@371:         final ServerConfiguration conf = s.getServerConfiguration();
jaroslav@357:         conf.addHttpHandler(new Page(resources, 
jaroslav@357:             "org/apidesign/bck2brwsr/launcher/console.xhtml",
jaroslav@332:             "org.apidesign.bck2brwsr.launcher.Console", "welcome", "false"
jaroslav@332:         ), "/console");
jaroslav@348:         conf.addHttpHandler(new VM(resources), "/bck2brwsr.js");
jaroslav@332:         conf.addHttpHandler(new VMInit(), "/vm.js");
jaroslav@348:         conf.addHttpHandler(new Classes(resources), "/classes/");
jaroslav@371:         return s;
jaroslav@357:     }
jaroslav@357:     
jaroslav@357:     private void executeInBrowser() throws InterruptedException, URISyntaxException, IOException {
jaroslav@371:         wait = new CountDownLatch(1);
jaroslav@371:         server = initServer();
jaroslav@357:         ServerConfiguration conf = server.getServerConfiguration();
jaroslav@357:         conf.addHttpHandler(new Page(resources, 
jaroslav@357:             "org/apidesign/bck2brwsr/launcher/harness.xhtml"
jaroslav@357:         ), "/execute");
jaroslav@332:         conf.addHttpHandler(new HttpHandler() {
jaroslav@332:             int cnt;
jaroslav@371:             List<MethodInvocation> cases = new ArrayList<>();
jaroslav@332:             @Override
jaroslav@332:             public void service(Request request, Response response) throws Exception {
jaroslav@342:                 String id = request.getParameter("request");
jaroslav@342:                 String value = request.getParameter("result");
jaroslav@364:                 
jaroslav@342:                 if (id != null && value != null) {
jaroslav@364:                     LOG.log(Level.INFO, "Received result for case {0} = {1}", new Object[]{id, value});
jaroslav@381:                     value = decodeURL(value);
jaroslav@371:                     cases.get(Integer.parseInt(id)).result(value, null);
jaroslav@342:                 }
jaroslav@342:                 
jaroslav@371:                 MethodInvocation mi = methods.take();
jaroslav@372:                 if (mi == END) {
jaroslav@342:                     response.getWriter().write("");
jaroslav@342:                     wait.countDown();
jaroslav@342:                     cnt = 0;
jaroslav@372:                     LOG.log(Level.INFO, "End of data reached. Exiting.");
jaroslav@342:                     return;
jaroslav@342:                 }
jaroslav@342:                 
jaroslav@371:                 cases.add(mi);
jaroslav@371:                 final String cn = mi.className;
jaroslav@371:                 final String mn = mi.methodName;
jaroslav@364:                 LOG.log(Level.INFO, "Request for {0} case. Sending {1}.{2}", new Object[]{cnt, cn, mn});
jaroslav@332:                 response.getWriter().write("{"
jaroslav@364:                     + "className: '" + cn + "', "
jaroslav@364:                     + "methodName: '" + mn + "', "
jaroslav@332:                     + "request: " + cnt
jaroslav@526:                 );
jaroslav@526:                 if (mi.html != null) {
jaroslav@526:                     response.getWriter().write(", html: '");
jaroslav@526:                     response.getWriter().write(encodeJSON(mi.html));
jaroslav@526:                     response.getWriter().write("'");
jaroslav@526:                 }
jaroslav@526:                 response.getWriter().write("}");
jaroslav@342:                 cnt++;
jaroslav@332:             }
jaroslav@342:         }, "/data");
jaroslav@357: 
jaroslav@371:         this.brwsr = launchServerAndBrwsr(server, "/execute");
jaroslav@371:     }
jaroslav@371:     
jaroslav@526:     private static String encodeJSON(String in) {
jaroslav@526:         StringBuilder sb = new StringBuilder();
jaroslav@526:         for (int i = 0; i < in.length(); i++) {
jaroslav@526:             char ch = in.charAt(i);
jaroslav@526:             if (ch < 32 || ch == '\'' || ch == '"') {
jaroslav@526:                 sb.append("\\u");
jaroslav@526:                 String hs = "0000" + Integer.toHexString(ch);
jaroslav@526:                 hs = hs.substring(hs.length() - 4);
jaroslav@526:                 sb.append(hs);
jaroslav@526:             } else {
jaroslav@526:                 sb.append(ch);
jaroslav@526:             }
jaroslav@526:         }
jaroslav@526:         return sb.toString();
jaroslav@526:     }
jaroslav@526:     
jaroslav@382:     @Override
jaroslav@382:     public void shutdown() throws IOException {
jaroslav@372:         methods.offer(END);
jaroslav@363:         for (;;) {
jaroslav@371:             int prev = methods.size();
jaroslav@382:             try {
jaroslav@389:                 if (wait != null && wait.await(timeOut, TimeUnit.MILLISECONDS)) {
jaroslav@382:                     break;
jaroslav@382:                 }
jaroslav@382:             } catch (InterruptedException ex) {
jaroslav@382:                 throw new IOException(ex);
jaroslav@363:             }
jaroslav@371:             if (prev == methods.size()) {
jaroslav@363:                 LOG.log(
jaroslav@363:                     Level.WARNING, 
jaroslav@363:                     "Timeout and no test has been executed meanwhile (at {0}). Giving up.", 
jaroslav@371:                     methods.size()
jaroslav@363:                 );
jaroslav@363:                 break;
jaroslav@363:             }
jaroslav@363:             LOG.log(Level.INFO, 
jaroslav@363:                 "Timeout, but tests got from {0} to {1}. Trying again.", 
jaroslav@371:                 new Object[]{prev, methods.size()}
jaroslav@363:             );
jaroslav@363:         }
jaroslav@365:         stopServerAndBrwsr(server, brwsr);
jaroslav@323:     }
jaroslav@331:     
jaroslav@342:     static void copyStream(InputStream is, OutputStream os, String baseURL, String... params) throws IOException {
jaroslav@331:         for (;;) {
jaroslav@331:             int ch = is.read();
jaroslav@331:             if (ch == -1) {
jaroslav@331:                 break;
jaroslav@331:             }
jaroslav@523:             if (ch == '$' && params.length > 0) {
jaroslav@331:                 int cnt = is.read() - '0';
jaroslav@342:                 if (cnt == 'U' - '0') {
jaroslav@342:                     os.write(baseURL.getBytes());
jaroslav@342:                 }
jaroslav@523:                 if (cnt >= 0 && cnt < params.length) {
jaroslav@331:                     os.write(params[cnt].getBytes());
jaroslav@331:                 }
jaroslav@331:             } else {
jaroslav@331:                 os.write(ch);
jaroslav@331:             }
jaroslav@331:         }
jaroslav@331:     }
jaroslav@356: 
jaroslav@365:     private Object[] launchServerAndBrwsr(HttpServer server, final String page) throws IOException, URISyntaxException, InterruptedException {
jaroslav@357:         server.start();
jaroslav@357:         NetworkListener listener = server.getListeners().iterator().next();
jaroslav@357:         int port = listener.getPort();
jaroslav@357:         
jaroslav@357:         URI uri = new URI("http://localhost:" + port + page);
jaroslav@362:         LOG.log(Level.INFO, "Showing {0}", uri);
jaroslav@433:         if (cmd == null) {
jaroslav@433:             try {
jaroslav@536:                 LOG.log(Level.INFO, "Trying Desktop.browse on {0} {2} by {1}", new Object[] {
jaroslav@536:                     System.getProperty("java.vm.name"),
jaroslav@536:                     System.getProperty("java.vm.vendor"),
jaroslav@536:                     System.getProperty("java.vm.version"),
jaroslav@536:                 });
jaroslav@433:                 java.awt.Desktop.getDesktop().browse(uri);
jaroslav@433:                 LOG.log(Level.INFO, "Desktop.browse successfully finished");
jaroslav@433:                 return null;
jaroslav@433:             } catch (UnsupportedOperationException ex) {
jaroslav@518:                 LOG.log(Level.INFO, "Desktop.browse not supported: {0}", ex.getMessage());
jaroslav@518:                 LOG.log(Level.FINE, null, ex);
jaroslav@433:             }
jaroslav@369:         }
jaroslav@369:         {
jaroslav@382:             String cmdName = cmd == null ? "xdg-open" : cmd;
jaroslav@382:             String[] cmdArr = { 
jaroslav@382:                 cmdName, uri.toString()
jaroslav@357:             };
jaroslav@382:             LOG.log(Level.INFO, "Launching {0}", Arrays.toString(cmdArr));
jaroslav@382:             final Process process = Runtime.getRuntime().exec(cmdArr);
jaroslav@369:             return new Object[] { process, null };
jaroslav@357:         }
jaroslav@361:     }
jaroslav@361:     
jaroslav@381:     private static String decodeURL(String s) {
jaroslav@381:         for (;;) {
jaroslav@381:             int pos = s.indexOf('%');
jaroslav@381:             if (pos == -1) {
jaroslav@381:                 return s;
jaroslav@381:             }
jaroslav@381:             int i = Integer.parseInt(s.substring(pos + 1, pos + 2), 16);
jaroslav@381:             s = s.substring(0, pos) + (char)i + s.substring(pos + 2);
jaroslav@381:         }
jaroslav@381:     }
jaroslav@381:     
jaroslav@382:     private void stopServerAndBrwsr(HttpServer server, Object[] brwsr) throws IOException {
jaroslav@389:         if (brwsr == null) {
jaroslav@389:             return;
jaroslav@389:         }
jaroslav@365:         Process process = (Process)brwsr[0];
jaroslav@365:         
jaroslav@365:         server.stop();
jaroslav@365:         InputStream stdout = process.getInputStream();
jaroslav@365:         InputStream stderr = process.getErrorStream();
jaroslav@365:         drain("StdOut", stdout);
jaroslav@365:         drain("StdErr", stderr);
jaroslav@365:         process.destroy();
jaroslav@382:         int res;
jaroslav@382:         try {
jaroslav@382:             res = process.waitFor();
jaroslav@382:         } catch (InterruptedException ex) {
jaroslav@382:             throw new IOException(ex);
jaroslav@382:         }
jaroslav@365:         LOG.log(Level.INFO, "Exit code: {0}", res);
jaroslav@365: 
jaroslav@365:         deleteTree((File)brwsr[1]);
jaroslav@365:     }
jaroslav@365:     
jaroslav@361:     private static void drain(String name, InputStream is) throws IOException {
jaroslav@361:         int av = is.available();
jaroslav@361:         if (av > 0) {
jaroslav@362:             StringBuilder sb = new StringBuilder();
jaroslav@362:             sb.append("v== ").append(name).append(" ==v\n");
jaroslav@361:             while (av-- > 0) {
jaroslav@362:                 sb.append((char)is.read());
jaroslav@361:             }
jaroslav@362:             sb.append("\n^== ").append(name).append(" ==^");
jaroslav@362:             LOG.log(Level.INFO, sb.toString());
jaroslav@361:         }
jaroslav@357:     }
jaroslav@357: 
jaroslav@365:     private void deleteTree(File file) {
jaroslav@369:         if (file == null) {
jaroslav@369:             return;
jaroslav@369:         }
jaroslav@365:         File[] arr = file.listFiles();
jaroslav@365:         if (arr != null) {
jaroslav@365:             for (File s : arr) {
jaroslav@365:                 deleteTree(s);
jaroslav@365:             }
jaroslav@365:         }
jaroslav@365:         file.delete();
jaroslav@365:     }
jaroslav@365: 
jaroslav@382:     @Override
jaroslav@382:     public void close() throws IOException {
jaroslav@382:         shutdown();
jaroslav@382:     }
jaroslav@382: 
jaroslav@348:     private class Res implements Bck2Brwsr.Resources {
jaroslav@348:         @Override
jaroslav@348:         public InputStream get(String resource) throws IOException {
jaroslav@348:             for (ClassLoader l : loaders) {
jaroslav@348:                 URL u = null;
jaroslav@348:                 Enumeration<URL> en = l.getResources(resource);
jaroslav@348:                 while (en.hasMoreElements()) {
jaroslav@348:                     u = en.nextElement();
jaroslav@348:                 }
jaroslav@348:                 if (u != null) {
jaroslav@348:                     return u.openStream();
jaroslav@348:                 }
jaroslav@348:             }
jaroslav@471:             for (Bck2Brwsr.Resources r : xRes) {
jaroslav@471:                 InputStream is = r.get(resource);
jaroslav@471:                 if (is != null) {
jaroslav@471:                     return is;
jaroslav@471:                 }
jaroslav@471:             }
jaroslav@348:             throw new IOException("Can't find " + resource);
jaroslav@348:         }
jaroslav@348:     }
jaroslav@330: 
jaroslav@332:     private static class Page extends HttpHandler {
jaroslav@332:         private final String resource;
jaroslav@331:         private final String[] args;
jaroslav@357:         private final Res res;
jaroslav@331:         
jaroslav@357:         public Page(Res res, String resource, String... args) {
jaroslav@357:             this.res = res;
jaroslav@332:             this.resource = resource;
jaroslav@526:             this.args = args.length == 0 ? new String[] { "$0" } : args;
jaroslav@330:         }
jaroslav@330: 
jaroslav@330:         @Override
jaroslav@330:         public void service(Request request, Response response) throws Exception {
jaroslav@357:             String r = resource;
jaroslav@357:             if (r == null) {
jaroslav@357:                 r = request.getHttpHandlerPath();
jaroslav@357:                 if (r.startsWith("/")) {
jaroslav@357:                     r = r.substring(1);
jaroslav@357:                 }
jaroslav@357:             }
jaroslav@523:             String[] replace = {};
jaroslav@433:             if (r.endsWith(".html")) {
jaroslav@357:                 response.setContentType("text/html");
jaroslav@433:                 LOG.info("Content type text/html");
jaroslav@523:                 replace = args;
jaroslav@433:             }
jaroslav@433:             if (r.endsWith(".xhtml")) {
jaroslav@433:                 response.setContentType("application/xhtml+xml");
jaroslav@433:                 LOG.info("Content type application/xhtml+xml");
jaroslav@523:                 replace = args;
jaroslav@357:             }
jaroslav@330:             OutputStream os = response.getOutputStream();
jaroslav@357:             try (InputStream is = res.get(r)) {
jaroslav@523:                 copyStream(is, os, request.getRequestURL().toString(), replace);
jaroslav@357:             } catch (IOException ex) {
jaroslav@357:                 response.setDetailMessage(ex.getLocalizedMessage());
jaroslav@357:                 response.setError();
jaroslav@357:                 response.setStatus(404);
jaroslav@357:             }
jaroslav@330:         }
jaroslav@330:     }
jaroslav@330: 
jaroslav@330:     private static class VM extends HttpHandler {
jaroslav@348:         private final Res loader;
jaroslav@330: 
jaroslav@348:         public VM(Res loader) {
jaroslav@330:             this.loader = loader;
jaroslav@330:         }
jaroslav@330: 
jaroslav@330:         @Override
jaroslav@330:         public void service(Request request, Response response) throws Exception {
jaroslav@330:             response.setCharacterEncoding("UTF-8");
jaroslav@330:             response.setContentType("text/javascript");
jaroslav@330:             Bck2Brwsr.generate(response.getWriter(), loader);
jaroslav@330:         }
jaroslav@330:     }
jaroslav@332:     private static class VMInit extends HttpHandler {
jaroslav@332:         public VMInit() {
jaroslav@332:         }
jaroslav@332: 
jaroslav@332:         @Override
jaroslav@332:         public void service(Request request, Response response) throws Exception {
jaroslav@332:             response.setCharacterEncoding("UTF-8");
jaroslav@332:             response.setContentType("text/javascript");
jaroslav@332:             response.getWriter().append(
jaroslav@332:                 "function ldCls(res) {\n"
jaroslav@332:                 + "  var request = new XMLHttpRequest();\n"
jaroslav@357:                 + "  request.open('GET', '/classes/' + res, false);\n"
jaroslav@332:                 + "  request.send();\n"
jaroslav@332:                 + "  var arr = eval('(' + request.responseText + ')');\n"
jaroslav@332:                 + "  return arr;\n"
jaroslav@332:                 + "}\n"
jaroslav@332:                 + "var vm = new bck2brwsr(ldCls);\n");
jaroslav@332:         }
jaroslav@332:     }
jaroslav@330: 
jaroslav@330:     private static class Classes extends HttpHandler {
jaroslav@348:         private final Res loader;
jaroslav@330: 
jaroslav@348:         public Classes(Res loader) {
jaroslav@330:             this.loader = loader;
jaroslav@330:         }
jaroslav@330: 
jaroslav@330:         @Override
jaroslav@330:         public void service(Request request, Response response) throws Exception {
jaroslav@330:             String res = request.getHttpHandlerPath();
jaroslav@330:             if (res.startsWith("/")) {
jaroslav@330:                 res = res.substring(1);
jaroslav@330:             }
jaroslav@348:             try (InputStream is = loader.get(res)) {
jaroslav@348:                 response.setContentType("text/javascript");
jaroslav@348:                 Writer w = response.getWriter();
jaroslav@348:                 w.append("[");
jaroslav@348:                 for (int i = 0;; i++) {
jaroslav@348:                     int b = is.read();
jaroslav@348:                     if (b == -1) {
jaroslav@348:                         break;
jaroslav@348:                     }
jaroslav@348:                     if (i > 0) {
jaroslav@348:                         w.append(", ");
jaroslav@348:                     }
jaroslav@348:                     if (i % 20 == 0) {
jaroslav@348:                         w.write("\n");
jaroslav@348:                     }
jaroslav@348:                     if (b > 127) {
jaroslav@348:                         b = b - 256;
jaroslav@348:                     }
jaroslav@348:                     w.append(Integer.toString(b));
jaroslav@348:                 }
jaroslav@348:                 w.append("\n]");
jaroslav@348:             } catch (IOException ex) {
jaroslav@348:                 response.setError();
jaroslav@348:                 response.setDetailMessage(ex.getMessage());
jaroslav@330:             }
jaroslav@330:         }
jaroslav@330:     }
jaroslav@323: }