1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package tests;
24
25 import java.io.ByteArrayInputStream;
26 import java.io.ByteArrayOutputStream;
27 import java.io.File;
28 import java.io.FileOutputStream;
29 import java.io.IOException;
30 import java.io.InputStream;
31 import java.io.OutputStream;
32 import java.io.PrintStream;
33 import java.io.PrintWriter;
34 import java.io.StringWriter;
35 import java.nio.file.Files;
36 import java.nio.file.Path;
37 import java.nio.file.Paths;
38 import java.nio.file.StandardCopyOption;
39 import java.util.ArrayList;
40 import java.util.Arrays;
41 import java.util.Collections;
42 import java.util.HashSet;
43 import java.util.List;
44 import java.util.Objects;
45 import java.util.Set;
46 import java.util.jar.JarEntry;
47 import java.util.jar.JarInputStream;
48 import java.util.jar.JarOutputStream;
49 import java.util.stream.Collectors;
50 import java.util.stream.Stream;
51 import java.util.zip.ZipEntry;
52
53 import javax.tools.JavaCompiler;
54 import javax.tools.StandardJavaFileManager;
55 import javax.tools.StandardLocation;
56 import javax.tools.ToolProvider;
57
58 /**
59 *
60 * A generator for jmods, jars and images.
61 */
62 public class JImageGenerator {
63
64 public static final String LOAD_ALL_CLASSES_TEMPLATE = "package PACKAGE;\n"
65 + "\n"
66 + "import java.net.URI;\n"
67 + "import java.nio.file.FileSystems;\n"
68 + "import java.nio.file.Files;\n"
69 + "import java.nio.file.Path;\n"
70 + "import java.util.function.Function;\n"
71 + "\n"
72 + "public class CLASS {\n"
73 + " private static long total_time;\n"
74 + " private static long num_classes;\n"
75 + " public static void main(String[] args) throws Exception {\n"
76 + " Function<Path, String> formatter = (path) -> {\n"
77 + " String clazz = path.toString().substring(\"modules/\".length()+1, path.toString().lastIndexOf(\".\"));\n"
78 + " clazz = clazz.substring(clazz.indexOf(\"/\") + 1);\n"
79 + " return clazz.replaceAll(\"/\", \"\\\\.\");\n"
80 + " };\n"
81 + " Files.walk(FileSystems.getFileSystem(URI.create(\"jrt:/\")).getPath(\"/modules/\")).\n"
82 + " filter((p) -> {\n"
83 + " return Files.isRegularFile(p) && p.toString().endsWith(\".class\")\n"
84 + " && !p.toString().endsWith(\"module-info.class\");\n"
85 + " }).\n"
86 + " map(formatter).forEach((clazz) -> {\n"
87 + " try {\n"
88 + " long t = System.currentTimeMillis();\n"
89 + " Class.forName(clazz, false, Thread.currentThread().getContextClassLoader());\n"
90 + " total_time+= System.currentTimeMillis()-t;\n"
91 + " num_classes+=1;\n"
92 + " } catch (IllegalAccessError ex) {\n"
93 + " // Security exceptions can occur, this is not what we are testing\n"
94 + " System.err.println(\"Access error, OK \" + clazz);\n"
95 + " } catch (Exception ex) {\n"
96 + " System.err.println(\"ERROR \" + clazz);\n"
97 + " throw new RuntimeException(ex);\n"
98 + " }\n"
99 + " });\n"
100 + " double res = (double) total_time / num_classes;\n"
101 + " // System.out.println(\"Total time \" + total_time + \" num classes \" + num_classes + \" average \" + res);\n"
102 + " }\n"
103 + "}\n";
104
105 private static final String OUTPUT_OPTION = "--output";
106 private static final String POST_PROCESS_OPTION = "--post-process-path";
107 private static final String MAIN_CLASS_OPTION = "--main-class";
108 private static final String CLASS_PATH_OPTION = "--class-path";
109 private static final String MODULE_PATH_OPTION = "--module-path";
110 private static final String ADD_MODULES_OPTION = "--add-modules";
111 private static final String LIMIT_MODULES_OPTION = "--limit-modules";
112 private static final String PLUGIN_MODULE_PATH = "--plugin-module-path";
113
114 private static final String CMDS_OPTION = "--cmds";
115 private static final String CONFIG_OPTION = "--config";
116 private static final String HASH_MODULES_OPTION = "--hash-modules";
117 private static final String LIBS_OPTION = "--libs";
118 private static final String MODULE_VERSION_OPTION = "--module-version";
119
120 private JImageGenerator() {}
121
122 private static String optionsPrettyPrint(String... args) {
123 return Stream.of(args).collect(Collectors.joining(" "));
124 }
125
126 public static File getJModsDir(File jdkHome) {
127 File jdkjmods = new File(jdkHome, "jmods");
128 if (!jdkjmods.exists()) {
129 return null;
130 }
131 return jdkjmods;
132 }
133
134 public static Path addFiles(Path module, InMemoryFile... resources) throws IOException {
135 Path tempFile = Files.createTempFile("jlink-test", "");
136 try (JarInputStream in = new JarInputStream(Files.newInputStream(module));
137 JarOutputStream out = new JarOutputStream(new FileOutputStream(tempFile.toFile()))) {
138 ZipEntry entry;
139 while ((entry = in.getNextEntry()) != null) {
140 String name = entry.getName();
141 out.putNextEntry(new ZipEntry(name));
142 copy(in, out);
143 out.closeEntry();
144 }
145 for (InMemoryFile r : resources) {
146 addFile(r, out);
147 }
148 }
149 Files.move(tempFile, module, StandardCopyOption.REPLACE_EXISTING);
150 return module;
151 }
152
153 private static void copy(InputStream in, OutputStream out) throws IOException {
154 int len;
155 byte[] buf = new byte[4096];
156 while ((len = in.read(buf)) > 0) {
157 out.write(buf, 0, len);
158 }
159 }
160
161 public static JModTask getJModTask() {
162 return new JModTask();
163 }
164
165 public static JLinkTask getJLinkTask() {
166 return new JLinkTask();
167 }
168
169 public static JImageTask getJImageTask() {
170 return new JImageTask();
171 }
172
173 private static void addFile(InMemoryFile resource, JarOutputStream target) throws IOException {
174 String fileName = resource.getPath();
175 fileName = fileName.replace("\\", "/");
176 String[] ss = fileName.split("/");
177 Path p = Paths.get("");
178 for (int i = 0; i < ss.length; ++i) {
179 if (i < ss.length - 1) {
180 if (!ss[i].isEmpty()) {
181 p = p.resolve(ss[i]);
182 JarEntry entry = new JarEntry(p.toString() + "/");
183 target.putNextEntry(entry);
184 target.closeEntry();
185 }
186 } else {
187 p = p.resolve(ss[i]);
188 JarEntry entry = new JarEntry(p.toString());
189 target.putNextEntry(entry);
190 copy(resource.getBytes(), target);
191 target.closeEntry();
192 }
193 }
194 }
195
196 public static Path createNewFile(Path root, String pathName, String extension) {
197 Path out = root.resolve(pathName + extension);
198 int i = 1;
199 while (Files.exists(out)) {
200 out = root.resolve(pathName + "-" + (++i) + extension);
201 }
202 return out;
203 }
204
205 public static Path generateSources(Path output, String moduleName, List<InMemorySourceFile> sources) throws IOException {
206 Path moduleDir = output.resolve(moduleName);
207 Files.createDirectory(moduleDir);
208 for (InMemorySourceFile source : sources) {
209 Path fileDir = moduleDir;
210 if (!source.packageName.isEmpty()) {
211 String dir = source.packageName.replace('.', File.separatorChar);
212 fileDir = moduleDir.resolve(dir);
213 Files.createDirectories(fileDir);
214 }
215 Files.write(fileDir.resolve(source.className + ".java"), source.source.getBytes());
216 }
217 return moduleDir;
218 }
219
220 public static Path generateSourcesFromTemplate(Path output, String moduleName, String... classNames) throws IOException {
221 List<InMemorySourceFile> sources = new ArrayList<>();
222 for (String className : classNames) {
223 String packageName = getPackageName(className);
224 String simpleName = getSimpleName(className);
225 String content = LOAD_ALL_CLASSES_TEMPLATE
226 .replace("CLASS", simpleName);
227 if (packageName.isEmpty()) {
228 content = content.replace("package PACKAGE;", packageName);
229 } else {
230 content = content.replace("PACKAGE", packageName);
231 }
232 sources.add(new InMemorySourceFile(packageName, simpleName, content));
233 }
234 return generateSources(output, moduleName, sources);
235 }
236
237 public static void generateModuleInfo(Path moduleDir, List<String> packages, String... dependencies) throws IOException {
238 StringBuilder moduleInfoBuilder = new StringBuilder();
239 Path file = moduleDir.resolve("module-info.java");
240 String moduleName = moduleDir.getFileName().toString();
241 moduleInfoBuilder.append("module ").append(moduleName).append("{\n");
242 for (String dep : dependencies) {
243 moduleInfoBuilder.append("requires ").append(dep).append(";\n");
244 }
245 for (String pkg : packages) {
246 if (!pkg.trim().isEmpty()) {
247 moduleInfoBuilder.append("exports ").append(pkg).append(";\n");
248 }
249 }
250 moduleInfoBuilder.append("}");
251 Files.write(file, moduleInfoBuilder.toString().getBytes());
252 }
253
254 public static void compileSuccess(Path source, Path destination, String... options) throws IOException {
255 if (!compile(source, destination, options)) {
256 throw new AssertionError("Compilation failed.");
257 }
258 }
259
260 public static boolean compile(Path source, Path destination, String... options) throws IOException {
261 JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
262 try (StandardJavaFileManager jfm = compiler.getStandardFileManager(null, null, null)) {
263 List<Path> sources
264 = Files.find(source, Integer.MAX_VALUE,
265 (file, attrs) -> file.toString().endsWith(".java"))
266 .collect(Collectors.toList());
267
268 Files.createDirectories(destination);
269 jfm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT, Collections.singleton(destination));
270
271 List<String> opts = Arrays.asList(options);
272 JavaCompiler.CompilationTask task
273 = compiler.getTask(null, jfm, null, opts, null,
274 jfm.getJavaFileObjectsFromPaths(sources));
275 List<String> list = new ArrayList<>(opts);
276 list.addAll(sources.stream()
277 .map(Path::toString)
278 .collect(Collectors.toList()));
279 System.err.println("javac options: " + optionsPrettyPrint(list.toArray(new String[list.size()])));
280 return task.call();
281 }
282 }
283
284 public static Path createJarFile(Path jarfile, Path dir) throws IOException {
285 return createJarFile(jarfile, dir, Paths.get("."));
286 }
287
288 public static Path createJarFile(Path jarfile, Path dir, Path file) throws IOException {
289 // create the target directory
290 Path parent = jarfile.getParent();
291 if (parent != null)
292 Files.createDirectories(parent);
293
294 List<Path> entries = Files.find(dir.resolve(file), Integer.MAX_VALUE,
295 (p, attrs) -> attrs.isRegularFile())
296 .map(dir::relativize)
297 .collect(Collectors.toList());
298
299 try (OutputStream out = Files.newOutputStream(jarfile);
300 JarOutputStream jos = new JarOutputStream(out)) {
301 for (Path entry : entries) {
302 // map the file path to a name in the JAR file
303 Path normalized = entry.normalize();
304 String name = normalized
305 .subpath(0, normalized.getNameCount()) // drop root
306 .toString()
307 .replace(File.separatorChar, '/');
308
309 jos.putNextEntry(new JarEntry(name));
310 Files.copy(dir.resolve(entry), jos);
311 }
312 }
313 return jarfile;
314 }
315
316 public static Set<String> getModuleContent(Path module) {
317 Result result = JImageGenerator.getJModTask()
318 .jmod(module)
319 .list();
320 result.assertSuccess();
321 return Stream.of(result.getMessage().split("\r?\n"))
322 .collect(Collectors.toSet());
323 }
324
325 public static void checkModule(Path module, Set<String> expected) throws IOException {
326 Set<String> actual = getModuleContent(module);
327 if (!Objects.equals(actual, expected)) {
328 Set<String> unexpected = new HashSet<>(actual);
329 unexpected.removeAll(expected);
330 Set<String> notFound = new HashSet<>(expected);
331 notFound.removeAll(actual);
332 System.err.println("Unexpected files:");
333 unexpected.forEach(s -> System.err.println("\t" + s));
334 System.err.println("Not found files:");
335 notFound.forEach(s -> System.err.println("\t" + s));
336 throw new AssertionError("Module check failed.");
337 }
338 }
339
340 public static class JModTask {
341
342 private final List<Path> classpath = new ArrayList<>();
343 private final List<Path> libs = new ArrayList<>();
344 private final List<Path> cmds = new ArrayList<>();
345 private final List<Path> config = new ArrayList<>();
346 private final List<Path> jars = new ArrayList<>();
347 private final List<Path> jmods = new ArrayList<>();
348 private final List<String> options = new ArrayList<>();
349 private Path output;
350 private String hashModules;
351 private String mainClass;
352 private String moduleVersion;
353
354 public JModTask addNativeLibraries(Path cp) {
355 this.libs.add(cp);
356 return this;
357 }
358
359 public JModTask hashModules(String hash) {
360 this.hashModules = hash;
361 return this;
362 }
363
364 public JModTask addCmds(Path cp) {
365 this.cmds.add(cp);
366 return this;
367 }
368
369 public JModTask addClassPath(Path cp) {
370 this.classpath.add(cp);
371 return this;
372 }
373
374 public JModTask addConfig(Path cp) {
375 this.config.add(cp);
376 return this;
377 }
378
379 public JModTask addJars(Path jars) {
380 this.jars.add(jars);
381 return this;
382 }
383
384 public JModTask addJmods(Path jmods) {
385 this.jmods.add(jmods);
386 return this;
387 }
388
389 public JModTask jmod(Path output) {
390 this.output = output;
391 return this;
392 }
393
394 public JModTask moduleVersion(String moduleVersion) {
395 this.moduleVersion = moduleVersion;
396 return this;
397 }
398
399 public JModTask mainClass(String mainClass) {
400 this.mainClass = mainClass;
401 return this;
402 }
403
404 public JModTask option(String o) {
405 this.options.add(o);
406 return this;
407 }
408
409 private String modulePath() {
410 // This is expect FIRST jmods THEN jars, if you change this, some tests could fail
411 String jmods = toPath(this.jmods);
412 String jars = toPath(this.jars);
413 return jmods + File.pathSeparator + jars;
414 }
415
416 private String toPath(List<Path> paths) {
417 return paths.stream()
418 .map(Path::toString)
419 .collect(Collectors.joining(File.pathSeparator));
420 }
421
422 private String[] optionsJMod(String cmd) {
423 List<String> options = new ArrayList<>();
424 options.add(cmd);
425 if (!cmds.isEmpty()) {
426 options.add(CMDS_OPTION);
427 options.add(toPath(cmds));
428 }
429 if (!config.isEmpty()) {
430 options.add(CONFIG_OPTION);
431 options.add(toPath(config));
432 }
433 if (hashModules != null) {
434 options.add(HASH_MODULES_OPTION);
435 options.add(hashModules);
436 }
437 if (mainClass != null) {
438 options.add(MAIN_CLASS_OPTION);
439 options.add(mainClass);
440 }
441 if (!libs.isEmpty()) {
442 options.add(LIBS_OPTION);
443 options.add(toPath(libs));
444 }
445 if (!classpath.isEmpty()) {
446 options.add(CLASS_PATH_OPTION);
447 options.add(toPath(classpath));
448 }
449 if (!jars.isEmpty() || !jmods.isEmpty()) {
450 options.add(MODULE_PATH_OPTION);
451 options.add(modulePath());
452 }
453 if (moduleVersion != null) {
454 options.add(MODULE_VERSION_OPTION);
455 options.add(moduleVersion);
456 }
457 options.addAll(this.options);
458 if (output != null) {
459 options.add(output.toString());
460 }
461 return options.toArray(new String[options.size()]);
462 }
463
464 public Result create() {
465 return cmd("create");
466 }
467
468 public Result list() {
469 return cmd("list");
470 }
471
472 public Result call() {
473 return cmd("");
474 }
475
476 private Result cmd(String cmd) {
477 String[] args = optionsJMod(cmd);
478 System.err.println("jmod options: " + optionsPrettyPrint(args));
479 ByteArrayOutputStream baos = new ByteArrayOutputStream();
480 int exitCode = jdk.tools.jmod.Main.run(args, new PrintStream(baos));
481 String msg = new String(baos.toByteArray());
482 return new Result(exitCode, msg, output);
483 }
484 }
485
486 public static String getPackageName(String canonicalName) {
487 int index = canonicalName.lastIndexOf('.');
488 return index > 0 ? canonicalName.substring(0, index) : "";
489 }
490
491 public static String getSimpleName(String canonicalName) {
492 int index = canonicalName.lastIndexOf('.');
493 return canonicalName.substring(index + 1);
494 }
495
496 public static class JImageTask {
497
498 private final List<Path> pluginModulePath = new ArrayList<>();
499 private final List<String> options = new ArrayList<>();
500 private Path dir;
501 private Path image;
502
503 public JImageTask pluginModulePath(Path p) {
504 this.pluginModulePath.add(p);
505 return this;
506 }
507
508 public JImageTask image(Path image) {
509 this.image = image;
510 return this;
511 }
512
513 public JImageTask dir(Path dir) {
514 this.dir = dir;
515 return this;
516 }
517
518 public JImageTask option(String o) {
519 this.options.add(o);
520 return this;
521 }
522
523 private String toPath(List<Path> paths) {
524 return paths.stream()
525 .map(Path::toString)
526 .collect(Collectors.joining(File.pathSeparator));
527 }
528
529 private String[] optionsJImage(String cmd) {
530 List<String> options = new ArrayList<>();
531 options.add(cmd);
532 if (dir != null) {
533 options.add("--dir");
534 options.add(dir.toString());
535 }
536 if (!pluginModulePath.isEmpty()) {
537 options.add(PLUGIN_MODULE_PATH);
538 options.add(toPath(pluginModulePath));
539 }
540 options.addAll(this.options);
541 options.add(image.toString());
542 return options.toArray(new String[options.size()]);
543 }
544
545 private Result cmd(String cmd, Path returnPath) {
546 String[] args = optionsJImage(cmd);
547 System.err.println("jimage options: " + optionsPrettyPrint(args));
548 StringWriter writer = new StringWriter();
549 int exitCode = jdk.tools.jimage.Main.run(args, new PrintWriter(writer));
550 return new Result(exitCode, writer.toString(), returnPath);
551 }
552
553 public Result extract() {
554 return cmd("extract", dir);
555 }
556 }
557
558 public static class JLinkTask {
559
560 private final List<Path> jars = new ArrayList<>();
561 private final List<Path> jmods = new ArrayList<>();
562 private final List<Path> pluginModulePath = new ArrayList<>();
563 private final List<String> addMods = new ArrayList<>();
564 private final List<String> limitMods = new ArrayList<>();
565 private final List<String> options = new ArrayList<>();
566 private String modulePath;
567 private Path output;
568 private Path existing;
569
570 public JLinkTask modulePath(String modulePath) {
571 this.modulePath = modulePath;
572 return this;
573 }
574
575 public JLinkTask addJars(Path jars) {
576 this.jars.add(jars);
577 return this;
578 }
579
580 public JLinkTask addJmods(Path jmods) {
581 this.jmods.add(jmods);
582 return this;
583 }
584
585 public JLinkTask pluginModulePath(Path p) {
586 this.pluginModulePath.add(p);
587 return this;
588 }
589
590 public JLinkTask addMods(String moduleName) {
591 this.addMods.add(moduleName);
592 return this;
593 }
594
595 public JLinkTask limitMods(String moduleName) {
596 this.limitMods.add(moduleName);
597 return this;
598 }
599
600 public JLinkTask output(Path output) {
601 this.output = output;
602 return this;
603 }
604
605 public JLinkTask existing(Path existing) {
606 this.existing = existing;
607 return this;
608 }
609
610 public JLinkTask option(String o) {
611 this.options.add(o);
612 return this;
613 }
614
615 private String modulePath() {
616 // This is expect FIRST jmods THEN jars, if you change this, some tests could fail
617 String jmods = toPath(this.jmods);
618 String jars = toPath(this.jars);
619 return jmods + File.pathSeparator + jars;
620 }
621
622 private String toPath(List<Path> paths) {
623 return paths.stream()
624 .map(Path::toString)
625 .collect(Collectors.joining(File.pathSeparator));
626 }
627
628 private String[] optionsJLink() {
629 List<String> options = new ArrayList<>();
630 if (output != null) {
631 options.add(OUTPUT_OPTION);
632 options.add(output.toString());
633 }
634 if (!addMods.isEmpty()) {
635 options.add(ADD_MODULES_OPTION);
636 options.add(addMods.stream().collect(Collectors.joining(",")));
637 }
638 if (!limitMods.isEmpty()) {
639 options.add(LIMIT_MODULES_OPTION);
640 options.add(limitMods.stream().collect(Collectors.joining(",")));
641 }
642 if (!jars.isEmpty() || !jmods.isEmpty()) {
643 options.add(MODULE_PATH_OPTION);
644 options.add(modulePath());
645 }
646 if (modulePath != null) {
647 options.add(MODULE_PATH_OPTION);
648 options.add(modulePath);
649 }
650 if (!pluginModulePath.isEmpty()) {
651 options.add(PLUGIN_MODULE_PATH);
652 options.add(toPath(pluginModulePath));
653 }
654 options.addAll(this.options);
655 return options.toArray(new String[options.size()]);
656 }
657
658 private String[] optionsPostProcessJLink() {
659 List<String> options = new ArrayList<>();
660 if (existing != null) {
661 options.add(POST_PROCESS_OPTION);
662 options.add(existing.toString());
663 }
664 options.addAll(this.options);
665 return options.toArray(new String[options.size()]);
666 }
667
668 public Result call() {
669 String[] args = optionsJLink();
670 System.err.println("jlink options: " + optionsPrettyPrint(args));
671 StringWriter writer = new StringWriter();
672 int exitCode = jdk.tools.jlink.internal.Main.run(args, new PrintWriter(writer));
673 return new Result(exitCode, writer.toString(), output);
674 }
675
676 public Result callPostProcess() {
677 String[] args = optionsPostProcessJLink();
678 System.err.println("jlink options: " + optionsPrettyPrint(args));
679 StringWriter writer = new StringWriter();
680 int exitCode = jdk.tools.jlink.internal.Main.run(args, new PrintWriter(writer));
681 return new Result(exitCode, writer.toString(), output);
682 }
683 }
684
685 public static class InMemorySourceFile {
686 public final String packageName;
687 public final String className;
688 public final String source;
689
690 public InMemorySourceFile(String packageName, String simpleName, String source) {
691 this.packageName = packageName;
692 this.className = simpleName;
693 this.source = source;
694 }
695 }
696
697 public static class InMemoryFile {
698 private final String path;
699 private final byte[] bytes;
700
701 public String getPath() {
702 return path;
703 }
704
705 public InputStream getBytes() {
706 return new ByteArrayInputStream(bytes);
707 }
708
709 public InMemoryFile(String path, byte[] bytes) {
710 this.path = path;
711 this.bytes = bytes;
712 }
713
714 public InMemoryFile(String path, InputStream is) throws IOException {
715 this(path, readAllBytes(is));
716 }
717 }
718
719 public static byte[] readAllBytes(InputStream is) throws IOException {
720 ByteArrayOutputStream baos = new ByteArrayOutputStream();
721 byte[] buf = new byte[1024];
722 while (true) {
723 int n = is.read(buf);
724 if (n < 0) {
725 break;
726 }
727 baos.write(buf, 0, n);
728 }
729 return baos.toByteArray();
730 }
731 }