71 lines
2.5 KiB
Java
71 lines
2.5 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hwpf.model;
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import org.apache.poi.util.Internal;
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/**
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* A data structure used to hold some data we don't
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* understand / can't handle, so we have it available
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* for when we come to write back out again
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*/
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@Internal
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public final class UnhandledDataStructure
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{
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byte[] _buf;
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public UnhandledDataStructure(byte[] buf, int offset, int length)
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{
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// Sanity check the size they've asked for
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int offsetEnd = offset + length;
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if (offsetEnd > buf.length || offsetEnd < 0)
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{
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throw new IndexOutOfBoundsException("Buffer Length is " + buf.length + " " +
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"but code is tried to read " + length + " " +
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"from offset " + offset + " to " + offsetEnd);
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}
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if (offset < 0 || length < 0)
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{
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throw new IndexOutOfBoundsException("Offset and Length must both be >= 0, negative " +
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"indicies are not permitted - code is tried to read " + length + " from offset " + offset);
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}
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// Save that requested portion of the data
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_buf = copyOfRange(buf, offset, offsetEnd);
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}
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/**
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* YK: Arrays.copyOfRange is not in JDK 1.5
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*/
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static byte[] copyOfRange(byte[] original, int from, int to) {
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int newLength = to - from;
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if (newLength < 0)
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throw new IllegalArgumentException(from + " > " + to);
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byte[] copy = new byte[newLength];
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System.arraycopy(original, from, copy, 0,
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Math.min(original.length - from, newLength));
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return copy;
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}
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byte[] getBuf()
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{
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return _buf;
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}
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}
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