1 /*
2 * Copyright (c) 1997, 2018, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.util.jar;
27
28 import java.io.FilterInputStream;
29 import java.io.DataOutputStream;
30 import java.io.InputStream;
31 import java.io.OutputStream;
32 import java.io.IOException;
33 import java.util.Map;
34 import java.util.HashMap;
35 import java.util.Iterator;
36
37 /**
38 * The Manifest class is used to maintain Manifest entry names and their
39 * associated Attributes. There are main Manifest Attributes as well as
40 * per-entry Attributes. For information on the Manifest format, please
41 * see the
42 * <a href="{@docRoot}/../specs/jar/jar.html">
43 * Manifest format specification</a>.
44 *
45 * @author David Connelly
46 * @see Attributes
47 * @since 1.2
48 */
49 public class Manifest implements Cloneable {
50 // manifest main attributes
51 private Attributes attr = new Attributes();
52
53 // manifest entries
54 private Map<String, Attributes> entries = new HashMap<>();
55
56 /**
57 * Constructs a new, empty Manifest.
58 */
59 public Manifest() {
60 }
61
62 /**
63 * Constructs a new Manifest from the specified input stream.
64 *
65 * @param is the input stream containing manifest data
66 * @throws IOException if an I/O error has occurred
67 */
68 public Manifest(InputStream is) throws IOException {
69 read(is);
70 }
71
72 /**
73 * Constructs a new Manifest that is a copy of the specified Manifest.
74 *
75 * @param man the Manifest to copy
76 */
77 public Manifest(Manifest man) {
78 attr.putAll(man.getMainAttributes());
79 entries.putAll(man.getEntries());
80 }
81
82 /**
83 * Returns the main Attributes for the Manifest.
84 * @return the main Attributes for the Manifest
85 */
86 public Attributes getMainAttributes() {
87 return attr;
88 }
89
90 /**
91 * Returns a Map of the entries contained in this Manifest. Each entry
92 * is represented by a String name (key) and associated Attributes (value).
93 * The Map permits the {@code null} key, but no entry with a null key is
94 * created by {@link #read}, nor is such an entry written by using {@link
95 * #write}.
96 *
97 * @return a Map of the entries contained in this Manifest
98 */
99 public Map<String,Attributes> getEntries() {
100 return entries;
101 }
102
103 /**
104 * Returns the Attributes for the specified entry name.
105 * This method is defined as:
106 * <pre>
107 * return (Attributes)getEntries().get(name)
108 * </pre>
109 * Though {@code null} is a valid {@code name}, when
110 * {@code getAttributes(null)} is invoked on a {@code Manifest}
111 * obtained from a jar file, {@code null} will be returned. While jar
112 * files themselves do not allow {@code null}-named attributes, it is
113 * possible to invoke {@link #getEntries} on a {@code Manifest}, and
114 * on that result, invoke {@code put} with a null key and an
115 * arbitrary value. Subsequent invocations of
116 * {@code getAttributes(null)} will return the just-{@code put}
117 * value.
118 * <p>
119 * Note that this method does not return the manifest's main attributes;
120 * see {@link #getMainAttributes}.
121 *
122 * @param name entry name
123 * @return the Attributes for the specified entry name
124 */
125 public Attributes getAttributes(String name) {
126 return getEntries().get(name);
127 }
128
129 /**
130 * Clears the main Attributes as well as the entries in this Manifest.
131 */
132 public void clear() {
133 attr.clear();
134 entries.clear();
135 }
136
137 /**
138 * Writes the Manifest to the specified OutputStream.
139 * Attributes.Name.MANIFEST_VERSION must be set in
140 * MainAttributes prior to invoking this method.
141 *
142 * @param out the output stream
143 * @exception IOException if an I/O error has occurred
144 * @see #getMainAttributes
145 */
146 @SuppressWarnings("deprecation")
147 public void write(OutputStream out) throws IOException {
148 DataOutputStream dos = new DataOutputStream(out);
149 // Write out the main attributes for the manifest
150 attr.writeMain(dos);
151 // Now write out the pre-entry attributes
152 for (Map.Entry<String, Attributes> e : entries.entrySet()) {
153 StringBuffer buffer = new StringBuffer("Name: ");
154 String value = e.getKey();
155 if (value != null) {
156 byte[] vb = value.getBytes("UTF8");
157 value = new String(vb, 0, 0, vb.length);
158 }
159 buffer.append(value);
160 make72Safe(buffer);
161 buffer.append("\r\n");
162 dos.writeBytes(buffer.toString());
163 e.getValue().write(dos);
164 }
165 dos.flush();
166 }
167
168 /**
169 * Adds line breaks to enforce a maximum 72 bytes per line.
170 */
171 static void make72Safe(StringBuffer line) {
172 int length = line.length();
173 int index = 72;
174 while (index < length) {
175 line.insert(index, "\r\n ");
176 index += 74; // + line width + line break ("\r\n")
177 length += 3; // + line break ("\r\n") and space
178 }
179 return;
180 }
181
182 /**
183 * Reads the Manifest from the specified InputStream. The entry
184 * names and attributes read will be merged in with the current
185 * manifest entries.
186 *
187 * @param is the input stream
188 * @exception IOException if an I/O error has occurred
189 */
190 public void read(InputStream is) throws IOException {
191 // Buffered input stream for reading manifest data
192 FastInputStream fis = new FastInputStream(is);
193 // Line buffer
194 byte[] lbuf = new byte[512];
195 // Read the main attributes for the manifest
196 attr.read(fis, lbuf);
197 // Total number of entries, attributes read
198 int ecount = 0, acount = 0;
199 // Average size of entry attributes
200 int asize = 2;
201 // Now parse the manifest entries
202 int len;
203 String name = null;
204 boolean skipEmptyLines = true;
205 byte[] lastline = null;
206
207 while ((len = fis.readLine(lbuf)) != -1) {
208 if (lbuf[--len] != '\n') {
209 throw new IOException("manifest line too long");
210 }
211 if (len > 0 && lbuf[len-1] == '\r') {
212 --len;
213 }
214 if (len == 0 && skipEmptyLines) {
215 continue;
216 }
217 skipEmptyLines = false;
218
219 if (name == null) {
220 name = parseName(lbuf, len);
221 if (name == null) {
222 throw new IOException("invalid manifest format");
223 }
224 if (fis.peek() == ' ') {
225 // name is wrapped
226 lastline = new byte[len - 6];
227 System.arraycopy(lbuf, 6, lastline, 0, len - 6);
228 continue;
229 }
230 } else {
231 // continuation line
232 byte[] buf = new byte[lastline.length + len - 1];
233 System.arraycopy(lastline, 0, buf, 0, lastline.length);
234 System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
235 if (fis.peek() == ' ') {
236 // name is wrapped
237 lastline = buf;
238 continue;
239 }
240 name = new String(buf, 0, buf.length, "UTF8");
241 lastline = null;
242 }
243 Attributes attr = getAttributes(name);
244 if (attr == null) {
245 attr = new Attributes(asize);
246 entries.put(name, attr);
247 }
248 attr.read(fis, lbuf);
249 ecount++;
250 acount += attr.size();
251 //XXX: Fix for when the average is 0. When it is 0,
252 // you get an Attributes object with an initial
253 // capacity of 0, which tickles a bug in HashMap.
254 asize = Math.max(2, acount / ecount);
255
256 name = null;
257 skipEmptyLines = true;
258 }
259 }
260
261 private String parseName(byte[] lbuf, int len) {
262 if (toLower(lbuf[0]) == 'n' && toLower(lbuf[1]) == 'a' &&
263 toLower(lbuf[2]) == 'm' && toLower(lbuf[3]) == 'e' &&
264 lbuf[4] == ':' && lbuf[5] == ' ') {
265 try {
266 return new String(lbuf, 6, len - 6, "UTF8");
267 }
268 catch (Exception e) {
269 }
270 }
271 return null;
272 }
273
274 private int toLower(int c) {
275 return (c >= 'A' && c <= 'Z') ? 'a' + (c - 'A') : c;
276 }
277
278 /**
279 * Returns true if the specified Object is also a Manifest and has
280 * the same main Attributes and entries.
281 *
282 * @param o the object to be compared
283 * @return true if the specified Object is also a Manifest and has
284 * the same main Attributes and entries
285 */
286 public boolean equals(Object o) {
287 if (o instanceof Manifest) {
288 Manifest m = (Manifest)o;
289 return attr.equals(m.getMainAttributes()) &&
290 entries.equals(m.getEntries());
291 } else {
292 return false;
293 }
294 }
295
296 /**
297 * Returns the hash code for this Manifest.
298 */
299 public int hashCode() {
300 return attr.hashCode() + entries.hashCode();
301 }
302
303 /**
304 * Returns a shallow copy of this Manifest. The shallow copy is
305 * implemented as follows:
306 * <pre>
307 * public Object clone() { return new Manifest(this); }
308 * </pre>
309 * @return a shallow copy of this Manifest
310 */
311 public Object clone() {
312 return new Manifest(this);
313 }
314
315 /*
316 * A fast buffered input stream for parsing manifest files.
317 */
318 static class FastInputStream extends FilterInputStream {
319 private byte buf[];
320 private int count = 0;
321 private int pos = 0;
322
323 FastInputStream(InputStream in) {
324 this(in, 8192);
325 }
326
327 FastInputStream(InputStream in, int size) {
328 super(in);
329 buf = new byte[size];
330 }
331
332 public int read() throws IOException {
333 if (pos >= count) {
334 fill();
335 if (pos >= count) {
336 return -1;
337 }
338 }
339 return Byte.toUnsignedInt(buf[pos++]);
340 }
341
342 public int read(byte[] b, int off, int len) throws IOException {
343 int avail = count - pos;
344 if (avail <= 0) {
345 if (len >= buf.length) {
346 return in.read(b, off, len);
347 }
348 fill();
349 avail = count - pos;
350 if (avail <= 0) {
351 return -1;
352 }
353 }
354 if (len > avail) {
355 len = avail;
356 }
357 System.arraycopy(buf, pos, b, off, len);
358 pos += len;
359 return len;
360 }
361
362 /*
363 * Reads 'len' bytes from the input stream, or until an end-of-line
364 * is reached. Returns the number of bytes read.
365 */
366 public int readLine(byte[] b, int off, int len) throws IOException {
367 byte[] tbuf = this.buf;
368 int total = 0;
369 while (total < len) {
370 int avail = count - pos;
371 if (avail <= 0) {
372 fill();
373 avail = count - pos;
374 if (avail <= 0) {
375 return -1;
376 }
377 }
378 int n = len - total;
379 if (n > avail) {
380 n = avail;
381 }
382 int tpos = pos;
383 int maxpos = tpos + n;
384 while (tpos < maxpos && tbuf[tpos++] != '\n') ;
385 n = tpos - pos;
386 System.arraycopy(tbuf, pos, b, off, n);
387 off += n;
388 total += n;
389 pos = tpos;
390 if (tbuf[tpos-1] == '\n') {
391 break;
392 }
393 }
394 return total;
395 }
396
397 public byte peek() throws IOException {
398 if (pos == count)
399 fill();
400 if (pos == count)
401 return -1; // nothing left in buffer
402 return buf[pos];
403 }
404
405 public int readLine(byte[] b) throws IOException {
406 return readLine(b, 0, b.length);
407 }
408
409 public long skip(long n) throws IOException {
410 if (n <= 0) {
411 return 0;
412 }
413 long avail = count - pos;
414 if (avail <= 0) {
415 return in.skip(n);
416 }
417 if (n > avail) {
418 n = avail;
419 }
420 pos += n;
421 return n;
422 }
423
424 public int available() throws IOException {
425 return (count - pos) + in.available();
426 }
427
428 public void close() throws IOException {
429 if (in != null) {
430 in.close();
431 in = null;
432 buf = null;
433 }
434 }
435
436 private void fill() throws IOException {
437 count = pos = 0;
438 int n = in.read(buf, 0, buf.length);
439 if (n > 0) {
440 count = n;
441 }
442 }
443 }
444 }