165 lines
5.6 KiB
Java
165 lines
5.6 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.hssf.usermodel;
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import org.apache.poi.ddf.EscherBitmapBlip;
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import org.apache.poi.ddf.EscherBlipRecord;
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import org.apache.poi.ddf.EscherMetafileBlip;
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import org.apache.poi.ss.usermodel.PictureData;
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import org.apache.poi.ss.usermodel.Workbook;
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import org.apache.poi.util.PngUtils;
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/**
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* Represents binary data stored in the file. Eg. A GIF, JPEG etc...
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*/
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public class HSSFPictureData implements PictureData
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{
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// MSOBI constants for various formats.
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public static final short MSOBI_WMF = 0x2160;
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public static final short MSOBI_EMF = 0x3D40;
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public static final short MSOBI_PICT = 0x5420;
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public static final short MSOBI_PNG = 0x6E00;
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public static final short MSOBI_JPEG = 0x46A0;
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public static final short MSOBI_DIB = 0x7A80;
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// Mask of the bits in the options used to store the image format.
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public static final short FORMAT_MASK = (short) 0xFFF0;
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/**
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* Underlying escher blip record containing the bitmap data.
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*/
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private EscherBlipRecord blip;
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/**
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* Constructs a picture object.
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*
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* @param blip the underlying blip record containing the bitmap data.
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*/
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public HSSFPictureData( EscherBlipRecord blip )
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{
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this.blip = blip;
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}
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/* (non-Javadoc)
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* @see org.apache.poi.hssf.usermodel.PictureData#getData()
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*/
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public byte[] getData()
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{
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byte[] pictureData = blip.getPicturedata();
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//PNG created on MAC may have a 16-byte prefix which prevents successful reading.
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//Just cut it off!.
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if (PngUtils.matchesPngHeader(pictureData, 16))
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{
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byte[] png = new byte[pictureData.length-16];
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System.arraycopy(pictureData, 16, png, 0, png.length);
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pictureData = png;
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}
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return pictureData;
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}
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/**
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*
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* @return format of the picture.
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* @see HSSFWorkbook#PICTURE_TYPE_DIB
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* @see HSSFWorkbook#PICTURE_TYPE_WMF
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* @see HSSFWorkbook#PICTURE_TYPE_EMF
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* @see HSSFWorkbook#PICTURE_TYPE_PNG
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* @see HSSFWorkbook#PICTURE_TYPE_JPEG
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* @see HSSFWorkbook#PICTURE_TYPE_PICT
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*/
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public int getFormat(){
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return blip.getRecordId() - (short)0xF018;
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}
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/**
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* @see #getFormat
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* @return 'wmf', 'jpeg' etc depending on the format. never <code>null</code>
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*/
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public String suggestFileExtension() {
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switch (blip.getRecordId()) {
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case EscherMetafileBlip.RECORD_ID_WMF:
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return "wmf";
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case EscherMetafileBlip.RECORD_ID_EMF:
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return "emf";
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case EscherMetafileBlip.RECORD_ID_PICT:
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return "pict";
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case EscherBitmapBlip.RECORD_ID_PNG:
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return "png";
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case EscherBitmapBlip.RECORD_ID_JPEG:
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return "jpeg";
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case EscherBitmapBlip.RECORD_ID_DIB:
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return "dib";
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default:
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return "";
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}
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}
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/**
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* Returns the mime type for the image
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*/
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public String getMimeType() {
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switch (blip.getRecordId()) {
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case EscherMetafileBlip.RECORD_ID_WMF:
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return "image/x-wmf";
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case EscherMetafileBlip.RECORD_ID_EMF:
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return "image/x-emf";
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case EscherMetafileBlip.RECORD_ID_PICT:
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return "image/x-pict";
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case EscherBitmapBlip.RECORD_ID_PNG:
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return "image/png";
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case EscherBitmapBlip.RECORD_ID_JPEG:
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return "image/jpeg";
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case EscherBitmapBlip.RECORD_ID_DIB:
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return "image/bmp";
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default:
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return "image/unknown";
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}
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}
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/**
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* @return the POI internal image type, -1 if not unknown image type
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*
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* @see Workbook#PICTURE_TYPE_DIB
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* @see Workbook#PICTURE_TYPE_EMF
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* @see Workbook#PICTURE_TYPE_JPEG
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* @see Workbook#PICTURE_TYPE_PICT
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* @see Workbook#PICTURE_TYPE_PNG
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* @see Workbook#PICTURE_TYPE_WMF
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*/
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public int getPictureType() {
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switch (blip.getRecordId()) {
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case EscherMetafileBlip.RECORD_ID_WMF:
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return Workbook.PICTURE_TYPE_WMF;
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case EscherMetafileBlip.RECORD_ID_EMF:
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return Workbook.PICTURE_TYPE_EMF;
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case EscherMetafileBlip.RECORD_ID_PICT:
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return Workbook.PICTURE_TYPE_PICT;
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case EscherBitmapBlip.RECORD_ID_PNG:
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return Workbook.PICTURE_TYPE_PNG;
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case EscherBitmapBlip.RECORD_ID_JPEG:
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return Workbook.PICTURE_TYPE_JPEG;
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case EscherBitmapBlip.RECORD_ID_DIB:
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return Workbook.PICTURE_TYPE_DIB;
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default:
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return -1;
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}
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}
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}
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