01: /*
02: *
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package com.sun.midp.jarutil;
28:
29: import java.lang.String;
30:
31: import java.io.IOException;
32:
33: import com.sun.j2me.security.AccessController;
34:
35: import com.sun.midp.io.Util;
36:
37: import com.sun.midp.security.Permissions;
38:
39: /**
40: * This class provides a Java API for reading an entry from a Jar file stored
41: * on the file system.
42: */
43: public class JarReader {
44: /**
45: * Returns the content of the given entry in the JAR file on the
46: * file system given by jarFilePath.
47: * <p>
48: * Method requires com.sun.midp.ams permission.
49: *
50: * @param jarFilePath file pathname of the JAR file to read. May
51: * be a relative pathname.
52: * @param entryName name of the entry to return.
53: *
54: * @return the content of the given entry in a byte array or null if
55: * the entry was not found
56: *
57: * @exception IOException if JAR is corrupt or not found
58: * @exception IOException if the entry does not exist.
59: * @exception SecurityException if the caller does not have permission
60: * to install software.
61: */
62: public static byte[] readJarEntry(String jarFilePath,
63: String entryName) throws IOException {
64: AccessController
65: .checkPermission(Permissions.AMS_PERMISSION_NAME);
66:
67: if (entryName.charAt(0) == '/') {
68: /*
69: * Strip off the leading directory separator, or the
70: * resource will not be found in the JAR.
71: */
72: entryName = entryName.substring(1, entryName.length());
73: }
74:
75: return readJarEntry0(jarFilePath, entryName);
76: }
77:
78: /**
79: * Performs the same function as readJarEntry.
80: *
81: * @param localJarFilePath file pathname of the JAR file to read. May
82: * be a relative pathname.
83: * @param localEntryName name of the entry to return.
84: *
85: * @return the content of the given entry in a byte array or null if
86: * the entry was not found
87: *
88: * @exception IOException if JAR is corrupt or not found
89: */
90: private static native byte[] readJarEntry0(String localJarFilePath,
91: String localEntryName) throws IOException;
92: }
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