1 /*
2 * Copyright (c) 2014, 2016, 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 jdk.internal.jimage;
27
28 import java.nio.ByteBuffer;
29 import java.nio.IntBuffer;
30 import java.util.Objects;
31
32 /**
33 * @implNote This class needs to maintain JDK 8 source compatibility.
34 *
35 * It is used internally in the JDK to implement jimage/jrtfs access,
36 * but also compiled and delivered as part of the jrtfs.jar to support access
37 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
38 */
39 public final class ImageHeader {
40 public static final int MAGIC = 0xCAFEDADA;
41 public static final int MAJOR_VERSION = 1;
42 public static final int MINOR_VERSION = 0;
43 private static final int HEADER_SLOTS = 7;
44
45 private final int magic;
46 private final int majorVersion;
47 private final int minorVersion;
48 private final int flags;
49 private final int resourceCount;
50 private final int tableLength;
51 private final int locationsSize;
52 private final int stringsSize;
53
54 public ImageHeader(int resourceCount, int tableCount,
55 int locationsSize, int stringsSize) {
56 this(MAGIC, MAJOR_VERSION, MINOR_VERSION, 0, resourceCount,
57 tableCount, locationsSize, stringsSize);
58 }
59
60 public ImageHeader(int magic, int majorVersion, int minorVersion,
61 int flags, int resourceCount,
62 int tableLength, int locationsSize, int stringsSize)
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1 /*
2 * Copyright (c) 2014, 2025, 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 jdk.internal.jimage;
27
28 import java.nio.ByteBuffer;
29 import java.nio.IntBuffer;
30 import java.util.Objects;
31
32 /**
33 * Defines the header and version information for jimage files.
34 *
35 * <p>Version number changes must be synced in a single change across all code
36 * which reads/writes jimage files, and code which tries to open a jimage file
37 * with an unexpected version should fail.
38 *
39 * <p>Known jimage file code which needs updating on version change:
40 * <ul>
41 * <li>src/java.base/share/native/libjimage/imageFile.hpp
42 * </ul>
43 *
44 * <p>Version history:
45 * <ul>
46 * <li>{@code 1.0}: Original version.
47 * <li>{@code 1.1}: Support preview mode with new flags.
48 * </ul>
49 *
50 * @implNote This class needs to maintain JDK 8 source compatibility.
51 *
52 * It is used internally in the JDK to implement jimage/jrtfs access,
53 * but also compiled and delivered as part of the jrtfs.jar to support access
54 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
55 */
56 public final class ImageHeader {
57 public static final int MAGIC = 0xCAFEDADA;
58 public static final int MAJOR_VERSION = 1;
59 public static final int MINOR_VERSION = 1;
60 private static final int HEADER_SLOTS = 7;
61
62 private final int magic;
63 private final int majorVersion;
64 private final int minorVersion;
65 private final int flags;
66 private final int resourceCount;
67 private final int tableLength;
68 private final int locationsSize;
69 private final int stringsSize;
70
71 public ImageHeader(int resourceCount, int tableCount,
72 int locationsSize, int stringsSize) {
73 this(MAGIC, MAJOR_VERSION, MINOR_VERSION, 0, resourceCount,
74 tableCount, locationsSize, stringsSize);
75 }
76
77 public ImageHeader(int magic, int majorVersion, int minorVersion,
78 int flags, int resourceCount,
79 int tableLength, int locationsSize, int stringsSize)
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