Package com.lowagie.text

Source Code of com.lowagie.text.Jpeg

/*
* $Id: Jpeg.java 2839 2007-06-14 15:10:49Z psoares33 $
* $Name$
*
* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above.  If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/

package com.lowagie.text;

import com.google.code.appengine.awt.color.ICC_Profile;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

/**
* An <CODE>Jpeg</CODE> is the representation of a graphic element (JPEG)
* that has to be inserted into the document
*
* @see    Element
* @see    Image
*/

public class Jpeg extends Image {
   
    // public static final membervariables
   
    /** This is a type of marker. */
    public static final int NOT_A_MARKER = -1;
   
    /** This is a type of marker. */
    public static final int VALID_MARKER = 0;
   
    /** Acceptable Jpeg markers. */
    public static final int[] VALID_MARKERS = {0xC0, 0xC1, 0xC2};
   
    /** This is a type of marker. */
    public static final int UNSUPPORTED_MARKER = 1;
   
    /** Unsupported Jpeg markers. */
    public static final int[] UNSUPPORTED_MARKERS = {0xC3, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCD, 0xCE, 0xCF};
   
    /** This is a type of marker. */
    public static final int NOPARAM_MARKER = 2;
   
    /** Jpeg markers without additional parameters. */
    public static final int[] NOPARAM_MARKERS = {0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0x01};
   
    /** Marker value */
    public static final int M_APP0 = 0xE0;
    /** Marker value */
    public static final int M_APP2 = 0xE2;
    /** Marker value */
    public static final int M_APPE = 0xEE;
   
    /** sequence that is used in all Jpeg files */
    public static final byte JFIF_ID[] = {0x4A, 0x46, 0x49, 0x46, 0x00};
   
    private byte[][] icc;
    // Constructors
   
    Jpeg(Image image) {
        super(image);
    }

    /**
     * Constructs a <CODE>Jpeg</CODE>-object, using an <VAR>url</VAR>.
     *
     * @param    url      the <CODE>URL</CODE> where the image can be found
     * @throws BadElementException
     * @throws IOException
     */
    public Jpeg(URL url) throws BadElementException, IOException {
        super(url);
        processParameters();
    }
   
    /**
     * Constructs a <CODE>Jpeg</CODE>-object from memory.
     *
     * @param    img    the memory image
     * @throws BadElementException
     * @throws IOException
     */
   
    public Jpeg(byte[] img) throws BadElementException, IOException {
        super((URL)null);
        rawData = img;
        originalData = img;
        processParameters();
    }
   
    /**
     * Constructs a <CODE>Jpeg</CODE>-object from memory.
     *
     * @param    img      the memory image.
     * @param    width    the width you want the image to have
     * @param    height    the height you want the image to have
     * @throws BadElementException
     * @throws IOException
     */
   
    public Jpeg(byte[] img, float width, float height) throws BadElementException, IOException {
        this(img);
        scaledWidth = width;
        scaledHeight = height;
    }
   
    // private static methods
   
    /**
     * Reads a short from the <CODE>InputStream</CODE>.
     *
     * @param  is    the <CODE>InputStream</CODE>
     * @return  an int
     * @throws IOException
     */
    private static final int getShort(InputStream is) throws IOException {
        return (is.read() << 8) + is.read();
    }
   
    /**
     * Returns a type of marker.
     *
     * @param  marker      an int
     * @return  a type: <VAR>VALID_MARKER</CODE>, <VAR>UNSUPPORTED_MARKER</VAR> or <VAR>NOPARAM_MARKER</VAR>
     */
    private static final int marker(int marker) {
        for (int i = 0; i < VALID_MARKERS.length; i++) {
            if (marker == VALID_MARKERS[i]) {
                return VALID_MARKER;
            }
        }
        for (int i = 0; i < NOPARAM_MARKERS.length; i++) {
            if (marker == NOPARAM_MARKERS[i]) {
                return NOPARAM_MARKER;
            }
        }
        for (int i = 0; i < UNSUPPORTED_MARKERS.length; i++) {
            if (marker == UNSUPPORTED_MARKERS[i]) {
                return UNSUPPORTED_MARKER;
            }
        }
        return NOT_A_MARKER;
    }
   
    // private methods
   
    /**
     * This method checks if the image is a valid JPEG and processes some parameters.
     * @throws BadElementException
     * @throws IOException
     */
    private void processParameters() throws BadElementException, IOException {
        type = JPEG;
        originalType = ORIGINAL_JPEG;
        InputStream is = null;
        try {
            String errorID;
            if (rawData == null){
                is = url.openStream();
                errorID = url.toString();
            }
            else{
                is = new java.io.ByteArrayInputStream(rawData);
                errorID = "Byte array";
            }
            if (is.read() != 0xFF || is.read() != 0xD8)  {
                throw new BadElementException(errorID + " is not a valid JPEG-file.");
            }
            boolean firstPass = true;
            int len;
            while (true) {
                int v = is.read();
                if (v < 0)
                    throw new IOException("Premature EOF while reading JPG.");
                if (v == 0xFF) {
                    int marker = is.read();
                    if (firstPass && marker == M_APP0) {
                        firstPass = false;
                        len = getShort(is);
                        if (len < 16) {
                            Utilities.skip(is, len - 2);
                            continue;
                        }
                        byte bcomp[] = new byte[JFIF_ID.length];
                        int r = is.read(bcomp);
                        if (r != bcomp.length)
                            throw new BadElementException(errorID + " corrupted JFIF marker.");
                        boolean found = true;
                        for (int k = 0; k < bcomp.length; ++k) {
                            if (bcomp[k] != JFIF_ID[k]) {
                                found = false;
                                break;
                            }
                        }
                        if (!found) {
                            Utilities.skip(is, len - 2 - bcomp.length);
                            continue;
                        }
                        Utilities.skip(is, 2);
                        int units = is.read();
                        int dx = getShort(is);
                        int dy = getShort(is);
                        if (units == 1) {
                            dpiX = dx;
                            dpiY = dy;
                        }
                        else if (units == 2) {
                            dpiX = (int)((float)dx * 2.54f + 0.5f);
                            dpiY = (int)((float)dy * 2.54f + 0.5f);
                        }
                        Utilities.skip(is, len - 2 - bcomp.length - 7);
                        continue;
                    }
                    if (marker == M_APPE) {
                        len = getShort(is) - 2;
                        byte[] byteappe = new byte[len];
                        for (int k = 0; k < len; ++k) {
                            byteappe[k] = (byte)is.read();
                        }
                        if (byteappe.length >= 12) {
                            String appe = new String(byteappe, 0, 5, "ISO-8859-1");
                            if (appe.equals("Adobe")) {
                                invert = true;
                            }
                        }
                        continue;
                    }
                    if (marker == M_APP2) {
                        len = getShort(is) - 2;
                        byte[] byteapp2 = new byte[len];
                        for (int k = 0; k < len; ++k) {
                            byteapp2[k] = (byte)is.read();
                        }
                        if (byteapp2.length >= 14) {
                            String app2 = new String(byteapp2, 0, 11, "ISO-8859-1");
                            if (app2.equals("ICC_PROFILE")) {
                                int order = byteapp2[12] & 0xff;
                                int count = byteapp2[13] & 0xff;
                                if (icc == null)
                                    icc = new byte[count][];
                                icc[order - 1] = byteapp2;
                            }
                        }
                        continue;
                    }
                    firstPass = false;
                    int markertype = marker(marker);
                    if (markertype == VALID_MARKER) {
                        Utilities.skip(is, 2);
                        if (is.read() != 0x08) {
                            throw new BadElementException(errorID + " must have 8 bits per component.");
                        }
                        scaledHeight = getShort(is);
                        setTop(scaledHeight);
                        scaledWidth = getShort(is);
                        setRight(scaledWidth);
                        colorspace = is.read();
                        bpc = 8;
                        break;
                    }
                    else if (markertype == UNSUPPORTED_MARKER) {
                        throw new BadElementException(errorID + ": unsupported JPEG marker: " + marker);
                    }
                    else if (markertype != NOPARAM_MARKER) {
                        Utilities.skip(is, getShort(is) - 2);
                    }
                }
            }
        }
        finally {
            if (is != null) {
                is.close();
            }
        }
        plainWidth = getWidth();
        plainHeight = getHeight();
        if (icc != null) {
            int total = 0;
            for (int k = 0; k < icc.length; ++k) {
                if (icc[k] == null) {
                    icc = null;
                    return;
                }
                total += icc[k].length - 14;
            }
            byte[] ficc = new byte[total];
            total = 0;
            for (int k = 0; k < icc.length; ++k) {
                System.arraycopy(icc[k], 14, ficc, total, icc[k].length - 14);
                total += icc[k].length - 14;
            }
            ICC_Profile icc_prof = ICC_Profile.getInstance(ficc);
            tagICC(icc_prof);
            icc = null;
        }
    }
}
TOP

Related Classes of com.lowagie.text.Jpeg

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.