imported from ant 1.7 source distribution

[vamsas.git] / src / org / apache / tools / zip / UnrecognizedExtraField.java

diff --git a/src/org/apache/tools/zip/UnrecognizedExtraField.java b/src/org/apache/tools/zip/UnrecognizedExtraField.java
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+++ b/src/org/apache/tools/zip/UnrecognizedExtraField.java
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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package org.apache.tools.zip;
+
+/**
+ * Simple placeholder for all those extra fields we don't want to deal
+ * with.
+ *
+ * <p>Assumes local file data and central directory entries are
+ * identical - unless told the opposite.</p>
+ *
+ */
+public class UnrecognizedExtraField implements ZipExtraField {
+
+    /**
+     * The Header-ID.
+     *
+     * @since 1.1
+     */
+    private ZipShort headerId;
+
+    /**
+     * Set the header id.
+     * @param headerId the header id to use
+     */
+    public void setHeaderId(ZipShort headerId) {
+        this.headerId = headerId;
+    }
+
+    /**
+     * Get the header id.
+     * @return the header id
+     */
+    public ZipShort getHeaderId() {
+        return headerId;
+    }
+
+    /**
+     * Extra field data in local file data - without
+     * Header-ID or length specifier.
+     *
+     * @since 1.1
+     */
+    private byte[] localData;
+
+    /**
+     * Set the extra field data in the local file data -
+     * without Header-ID or length specifier.
+     * @param data the field data to use
+     */
+    public void setLocalFileDataData(byte[] data) {
+        localData = data;
+    }
+
+    /**
+     * Get the length of the local data.
+     * @return the length of the local data
+     */
+    public ZipShort getLocalFileDataLength() {
+        return new ZipShort(localData.length);
+    }
+
+    /**
+     * Get the local data.
+     * @return the local data
+     */
+    public byte[] getLocalFileDataData() {
+        return localData;
+    }
+
+    /**
+     * Extra field data in central directory - without
+     * Header-ID or length specifier.
+     *
+     * @since 1.1
+     */
+    private byte[] centralData;
+
+    /**
+     * Set the extra field data in central directory.
+     * @param data the data to use
+     */
+    public void setCentralDirectoryData(byte[] data) {
+        centralData = data;
+    }
+
+    /**
+     * Get the central data length.
+     * If there is no central data, get the local file data length.
+     * @return the central data length
+     */
+    public ZipShort getCentralDirectoryLength() {
+        if (centralData != null) {
+            return new ZipShort(centralData.length);
+        }
+        return getLocalFileDataLength();
+    }
+
+    /**
+     * Get the central data.
+     * @return the central data if present, else return the local file data
+     */
+    public byte[] getCentralDirectoryData() {
+        if (centralData != null) {
+            return centralData;
+        }
+        return getLocalFileDataData();
+    }
+
+    /**
+     * @param data the array of bytes.
+     * @param offset the source location in the data array.
+     * @param length the number of bytes to use in the data array.
+     * @see ZipExtraField#parseFromLocalFileData(byte[], int, int)
+     */
+    public void parseFromLocalFileData(byte[] data, int offset, int length) {
+        byte[] tmp = new byte[length];
+        System.arraycopy(data, offset, tmp, 0, length);
+        setLocalFileDataData(tmp);
+    }
+}