|
| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one or more |
| 3 | + * contributor license agreements. See the NOTICE file distributed with |
| 4 | + * this work for additional information regarding copyright ownership. |
| 5 | + * The ASF licenses this file to You under the Apache License, Version 2.0 |
| 6 | + * (the "License"); you may not use this file except in compliance with |
| 7 | + * the License. You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + * |
| 17 | + */ |
| 18 | + |
| 19 | +package os; |
| 20 | + |
| 21 | +import java.nio.charset.StandardCharsets; |
| 22 | +import java.util.zip.CRC32; |
| 23 | +import java.util.zip.ZipException; |
| 24 | + |
| 25 | +/** |
| 26 | + * A common base class for Unicode extra information extra fields. |
| 27 | + */ |
| 28 | +public abstract class _ApacheAbstractUnicodeExtraField implements _ApacheZipExtraField { |
| 29 | + private long nameCRC32; |
| 30 | + private byte[] unicodeName; |
| 31 | + private byte[] data; |
| 32 | + |
| 33 | + protected _ApacheAbstractUnicodeExtraField() { |
| 34 | + } |
| 35 | + |
| 36 | + /** |
| 37 | + * Assemble as unicode extension from the name/comment and |
| 38 | + * encoding of the original zip entry. |
| 39 | + * |
| 40 | + * @param text The file name or comment. |
| 41 | + * @param bytes The encoded of the filename or comment in the zip |
| 42 | + * file. |
| 43 | + * @param off The offset of the encoded filename or comment in |
| 44 | + * <code>bytes</code>. |
| 45 | + * @param len The length of the encoded filename or comment in |
| 46 | + * <code>bytes</code>. |
| 47 | + */ |
| 48 | + protected _ApacheAbstractUnicodeExtraField(final String text, final byte[] bytes, final int off, |
| 49 | + final int len) { |
| 50 | + final CRC32 crc32 = new CRC32(); |
| 51 | + crc32.update(bytes, off, len); |
| 52 | + nameCRC32 = crc32.getValue(); |
| 53 | + |
| 54 | + unicodeName = text.getBytes(StandardCharsets.UTF_8); |
| 55 | + } |
| 56 | + |
| 57 | + /** |
| 58 | + * Assemble as unicode extension from the name/comment and |
| 59 | + * encoding of the original zip entry. |
| 60 | + * |
| 61 | + * @param text The file name or comment. |
| 62 | + * @param bytes The encoded of the filename or comment in the zip |
| 63 | + * file. |
| 64 | + */ |
| 65 | + protected _ApacheAbstractUnicodeExtraField(final String text, final byte[] bytes) { |
| 66 | + |
| 67 | + this(text, bytes, 0, bytes.length); |
| 68 | + } |
| 69 | + |
| 70 | + private void assembleData() { |
| 71 | + if (unicodeName == null) { |
| 72 | + return; |
| 73 | + } |
| 74 | + |
| 75 | + data = new byte[5 + unicodeName.length]; |
| 76 | + // version 1 |
| 77 | + data[0] = 0x01; |
| 78 | + System.arraycopy(_ApacheZipLong.getBytes(nameCRC32), 0, data, 1, 4); |
| 79 | + System.arraycopy(unicodeName, 0, data, 5, unicodeName.length); |
| 80 | + } |
| 81 | + |
| 82 | + /** |
| 83 | + * @return The CRC32 checksum of the filename or comment as |
| 84 | + * encoded in the central directory of the zip file. |
| 85 | + */ |
| 86 | + public long getNameCRC32() { |
| 87 | + return nameCRC32; |
| 88 | + } |
| 89 | + |
| 90 | + /** |
| 91 | + * @param nameCRC32 The CRC32 checksum of the filename as encoded |
| 92 | + * in the central directory of the zip file to set. |
| 93 | + */ |
| 94 | + public void setNameCRC32(final long nameCRC32) { |
| 95 | + this.nameCRC32 = nameCRC32; |
| 96 | + data = null; |
| 97 | + } |
| 98 | + |
| 99 | + /** |
| 100 | + * @return The utf-8 encoded name. |
| 101 | + */ |
| 102 | + public byte[] getUnicodeName() { |
| 103 | + byte[] b = null; |
| 104 | + if (unicodeName != null) { |
| 105 | + b = new byte[unicodeName.length]; |
| 106 | + System.arraycopy(unicodeName, 0, b, 0, b.length); |
| 107 | + } |
| 108 | + return b; |
| 109 | + } |
| 110 | + |
| 111 | + /** |
| 112 | + * @param unicodeName The utf-8 encoded name to set. |
| 113 | + */ |
| 114 | + public void setUnicodeName(final byte[] unicodeName) { |
| 115 | + if (unicodeName != null) { |
| 116 | + this.unicodeName = new byte[unicodeName.length]; |
| 117 | + System.arraycopy(unicodeName, 0, this.unicodeName, 0, |
| 118 | + unicodeName.length); |
| 119 | + } else { |
| 120 | + this.unicodeName = null; |
| 121 | + } |
| 122 | + data = null; |
| 123 | + } |
| 124 | + |
| 125 | + /** {@inheritDoc} */ |
| 126 | + public byte[] getCentralDirectoryData() { |
| 127 | + if (data == null) { |
| 128 | + this.assembleData(); |
| 129 | + } |
| 130 | + byte[] b = null; |
| 131 | + if (data != null) { |
| 132 | + b = new byte[data.length]; |
| 133 | + System.arraycopy(data, 0, b, 0, b.length); |
| 134 | + } |
| 135 | + return b; |
| 136 | + } |
| 137 | + |
| 138 | + /** {@inheritDoc} */ |
| 139 | + public _ApacheZipShort getCentralDirectoryLength() { |
| 140 | + if (data == null) { |
| 141 | + assembleData(); |
| 142 | + } |
| 143 | + return new _ApacheZipShort(data.length); |
| 144 | + } |
| 145 | + |
| 146 | + /** {@inheritDoc} */ |
| 147 | + public byte[] getLocalFileDataData() { |
| 148 | + return getCentralDirectoryData(); |
| 149 | + } |
| 150 | + |
| 151 | + /** {@inheritDoc} */ |
| 152 | + public _ApacheZipShort getLocalFileDataLength() { |
| 153 | + return getCentralDirectoryLength(); |
| 154 | + } |
| 155 | + |
| 156 | + /** {@inheritDoc} */ |
| 157 | + public void parseFromLocalFileData(final byte[] buffer, final int offset, final int length) |
| 158 | + throws ZipException { |
| 159 | + |
| 160 | + if (length < 5) { |
| 161 | + throw new ZipException("UniCode path extra data must have at least" |
| 162 | + + " 5 bytes."); |
| 163 | + } |
| 164 | + |
| 165 | + final int version = buffer[offset]; |
| 166 | + |
| 167 | + if (version != 0x01) { |
| 168 | + throw new ZipException("Unsupported version [" + version |
| 169 | + + "] for UniCode path extra data."); |
| 170 | + } |
| 171 | + |
| 172 | + nameCRC32 = _ApacheZipLong.getValue(buffer, offset + 1); |
| 173 | + unicodeName = new byte[length - 5]; |
| 174 | + System.arraycopy(buffer, offset + 5, unicodeName, 0, length - 5); |
| 175 | + data = null; |
| 176 | + } |
| 177 | + |
| 178 | +} |
0 commit comments