1 | /*
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2 | * Copyright 2005 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.zip;
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19 |
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20 | import java.util.zip.ZipException;
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21 |
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22 | /**
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23 | * If this extra field is added as the very first extra field of the
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24 | * archive, Solaris will consider it an executable jar file.
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25 | *
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26 | * @since Ant 1.6.3
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27 | */
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28 | public final class JarMarker implements ZipExtraField {
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29 |
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30 | private static ZipShort ID = new ZipShort(0xCAFE);
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31 | private static ZipShort NULL = new ZipShort(0);
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32 | private static byte[] NO_BYTES = new byte[0];
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33 | private static JarMarker DEFAULT = new JarMarker();
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34 |
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35 | public JarMarker() {
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36 | // empty
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37 | }
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38 |
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39 | /**
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40 | * Since JarMarker is stateless we can always use the same instance.
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41 | */
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42 | public static JarMarker getInstance() {
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43 | return DEFAULT;
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44 | }
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45 |
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46 | /**
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47 | * The Header-ID.
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48 | * @return the header id
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49 | */
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50 | public ZipShort getHeaderId() {
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51 | return ID;
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52 | }
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53 |
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54 | /**
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55 | * Length of the extra field in the local file data - without
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56 | * Header-ID or length specifier.
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57 | * @return 0
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58 | */
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59 | public ZipShort getLocalFileDataLength() {
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60 | return NULL;
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61 | }
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62 |
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63 | /**
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64 | * Length of the extra field in the central directory - without
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65 | * Header-ID or length specifier.
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66 | * @return 0
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67 | */
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68 | public ZipShort getCentralDirectoryLength() {
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69 | return NULL;
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70 | }
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71 |
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72 | /**
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73 | * The actual data to put into local file data - without Header-ID
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74 | * or length specifier.
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75 | * @return the data
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76 | * @since 1.1
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77 | */
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78 | public byte[] getLocalFileDataData() {
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79 | return NO_BYTES;
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80 | }
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81 |
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82 | /**
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83 | * The actual data to put central directory - without Header-ID or
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84 | * length specifier.
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85 | * @return the data
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86 | */
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87 | public byte[] getCentralDirectoryData() {
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88 | return NO_BYTES;
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89 | }
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90 |
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91 | /**
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92 | * Populate data from this array as if it was in local file data.
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93 | * @param data an array of bytes
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94 | * @param offset the start offset
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95 | * @param length the number of bytes in the array from offset
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96 | *
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97 | * @throws ZipException on error
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98 | */
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99 | public void parseFromLocalFileData(byte[] data, int offset, int length)
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100 | throws ZipException {
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101 | if (length != 0) {
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102 | throw new ZipException("JarMarker doesn't expect any data");
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103 | }
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104 | }
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105 | }
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