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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.poi.sl.image;
-
- import java.awt.Dimension;
- import java.awt.Rectangle;
-
- import org.apache.logging.log4j.LogManager;
- import org.apache.logging.log4j.Logger;
- import org.apache.poi.util.Internal;
- import org.apache.poi.util.LittleEndian;
- import org.apache.poi.util.LocaleUtil;
-
- @Internal
- public class ImageHeaderEMF {
- private static final Logger LOG = LogManager.getLogger(ImageHeaderEMF.class);
-
- private static final String EMF_SIGNATURE = " EMF"; // 0x464D4520 (LE)
-
- // rectangular inclusive-inclusive bounds, in device units, of the smallest
- // rectangle that can be drawn around the image stored in the metafile.
- private final Rectangle deviceBounds;
-
- public ImageHeaderEMF(final byte[] data, final int off) {
- int offset = off;
- int type = (int)LittleEndian.getUInt(data, offset); offset += 4;
- if (type != 1) {
- LOG.atWarn().log("Invalid EMF picture - invalid type");
- deviceBounds = new Rectangle(0,0,200,200);
- return;
- }
- // ignore header size
- offset += 4;
- int left = LittleEndian.getInt(data, offset); offset += 4;
- int top = LittleEndian.getInt(data, offset); offset += 4;
- int right = LittleEndian.getInt(data, offset); offset += 4;
- int bottom = LittleEndian.getInt(data, offset); offset += 4;
- deviceBounds = new Rectangle(left, top, right-left == -1 ? 0 : right-left, bottom-top == -1 ? 0 : bottom-top);
- // ignore frame bounds
- offset += 16;
- String signature = new String(data, offset, EMF_SIGNATURE.length(), LocaleUtil.CHARSET_1252);
- if (!EMF_SIGNATURE.equals(signature)) {
- LOG.atWarn().log("Invalid EMF picture - invalid signature");
- }
- }
-
- public Dimension getSize() {
- return deviceBounds.getSize();
- }
-
- public Rectangle getBounds() {
- return deviceBounds;
- }
- }
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