| /* ==================================================================== |
| 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.poi.hdgf.streams; |
| |
| import org.apache.poi.util.IOUtils; |
| |
| /** |
| * Holds the representation of the stream on-disk, and |
| * handles de-compressing it as required. |
| * In future, may also handle writing it back out again |
| */ |
| public class StreamStore { // TODO - instantiable superclass |
| //arbitrarily selected; may need to increase |
| private static final int MAX_RECORD_LENGTH = 10_000_000; |
| |
| private byte[] contents; |
| |
| /** |
| * Creates a new, non compressed Stream Store |
| */ |
| protected StreamStore(byte[] data, int offset, int length) { |
| contents = IOUtils.safelyClone(data, offset, length, MAX_RECORD_LENGTH); |
| } |
| |
| protected void prependContentsWith(byte[] b) { |
| byte[] newContents = IOUtils.safelyAllocate(contents.length + (long)b.length, MAX_RECORD_LENGTH); |
| System.arraycopy(b, 0, newContents, 0, b.length); |
| System.arraycopy(contents, 0, newContents, b.length, contents.length); |
| contents = newContents; |
| } |
| protected void copyBlockHeaderToContents() {} |
| |
| protected byte[] getContents() { return contents; } |
| public byte[] _getContents() { return contents; } |
| } |