| /* |
| * 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.commons.imaging.formats.jpeg.segments; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.commons.imaging.ImageReadException; |
| import org.apache.commons.imaging.formats.jpeg.JpegConstants; |
| |
| public class JfifSegment extends Segment implements JpegConstants |
| { |
| public final int jfifMajorVersion; |
| public final int jfifMinorVersion; |
| public final int densityUnits; |
| public final int xDensity; |
| public final int yDensity; |
| |
| public final int xThumbnail; |
| public final int yThumbnail; |
| public final int thumbnailSize; |
| |
| @Override |
| public String getDescription() |
| { |
| return "JFIF (" + getSegmentType() + ")"; |
| } |
| |
| public JfifSegment(int marker, byte segmentData[]) |
| throws ImageReadException, IOException |
| { |
| this(marker, segmentData.length, new ByteArrayInputStream(segmentData)); |
| } |
| |
| public JfifSegment(int marker, int marker_length, InputStream is) |
| throws ImageReadException, IOException |
| { |
| super(marker, marker_length); |
| |
| byte signature[] = readBytes(is, JFIF0_SIGNATURE.size()); |
| if (!JFIF0_SIGNATURE.equals(signature) |
| && !JFIF0_SIGNATURE_ALTERNATIVE.equals(signature)) |
| throw new ImageReadException( |
| "Not a Valid JPEG File: missing JFIF string"); |
| |
| jfifMajorVersion = readByte("JFIF_major_version", is, |
| "Not a Valid JPEG File"); |
| jfifMinorVersion = readByte("JFIF_minor_version", is, |
| "Not a Valid JPEG File"); |
| densityUnits = readByte("density_units", is, "Not a Valid JPEG File"); |
| xDensity = read2Bytes("x_density", is, "Not a Valid JPEG File"); |
| yDensity = read2Bytes("y_density", is, "Not a Valid JPEG File"); |
| |
| xThumbnail = readByte("x_thumbnail", is, "Not a Valid JPEG File"); |
| yThumbnail = readByte("y_thumbnail", is, "Not a Valid JPEG File"); |
| thumbnailSize = xThumbnail * yThumbnail; |
| if (thumbnailSize > 0) |
| { |
| skipBytes(is, thumbnailSize, |
| "Not a Valid JPEG File: missing thumbnail"); |
| |
| } |
| |
| if (getDebug()) |
| System.out.println(""); |
| } |
| |
| } |