| /* ==================================================================== |
| 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.ddf; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.poi.util.IOUtils; |
| import org.apache.poi.util.LittleEndian; |
| |
| /** |
| * Generates a property given a reference into the byte array storing that property. |
| */ |
| public final class EscherPropertyFactory { |
| |
| //arbitrarily selected; may need to increase |
| private static final int MAX_RECORD_LENGTH = 100_000_000; |
| |
| /** |
| * Create new properties from a byte array. |
| * |
| * @param data The byte array containing the property |
| * @param offset The starting offset into the byte array |
| * @param numProperties The number of properties to be read |
| * @return The new properties |
| */ |
| public List<EscherProperty> createProperties(byte[] data, int offset, short numProperties) { |
| List<EscherProperty> results = new ArrayList<>(); |
| |
| int pos = offset; |
| |
| for (int i = 0; i < numProperties; i++) { |
| short propId; |
| int propData; |
| propId = LittleEndian.getShort( data, pos ); |
| propData = LittleEndian.getInt( data, pos + 2 ); |
| short propNumber = (short) ( propId & (short) 0x3FFF ); |
| boolean isComplex = ( propId & (short) 0x8000 ) != 0; |
| // boolean isBlipId = ( propId & (short) 0x4000 ) != 0; |
| |
| byte propertyType = EscherProperties.getPropertyType(propNumber); |
| EscherProperty ep; |
| switch (propertyType) { |
| case EscherPropertyMetaData.TYPE_BOOLEAN: |
| ep = new EscherBoolProperty( propId, propData ); |
| break; |
| case EscherPropertyMetaData.TYPE_RGB: |
| ep = new EscherRGBProperty( propId, propData ); |
| break; |
| case EscherPropertyMetaData.TYPE_SHAPEPATH: |
| ep = new EscherShapePathProperty( propId, propData ); |
| break; |
| default: |
| if ( !isComplex ) { |
| ep = new EscherSimpleProperty( propId, propData ); |
| } else if ( propertyType == EscherPropertyMetaData.TYPE_ARRAY) { |
| ep = new EscherArrayProperty( propId, IOUtils.safelyAllocate(propData, MAX_RECORD_LENGTH)); |
| } else { |
| ep = new EscherComplexProperty( propId, IOUtils.safelyAllocate(propData, MAX_RECORD_LENGTH)); |
| } |
| break; |
| } |
| results.add( ep ); |
| pos += 6; |
| } |
| |
| // Get complex data |
| for (EscherProperty p : results) { |
| if (p instanceof EscherComplexProperty) { |
| if (p instanceof EscherArrayProperty) { |
| pos += ((EscherArrayProperty)p).setArrayData(data, pos); |
| } else { |
| byte[] complexData = ((EscherComplexProperty)p).getComplexData(); |
| |
| int leftover = data.length - pos; |
| if (leftover < complexData.length) { |
| throw new IllegalStateException("Could not read complex escher property, length was " + complexData.length + ", but had only " + |
| leftover + " bytes left"); |
| } |
| |
| System.arraycopy(data, pos, complexData, 0, complexData.length); |
| pos += complexData.length; |
| } |
| } |
| } |
| return results; |
| } |
| } |