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iText, a free Java-PDF library
/*
* $Id: Jpeg.java 6134 2013-12-23 13:15:14Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2014 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.pdf.ICC_Profile;
/**
* An Jpeg 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;
/** Marker value for Photoshop IRB */
public static final int M_APPD = 0xED;
/** sequence that is used in all Jpeg files */
public static final byte JFIF_ID[] = {0x4A, 0x46, 0x49, 0x46, 0x00};
/** sequence preceding Photoshop resolution data */
public static final byte PS_8BIM_RESO[] = {0x38, 0x42, 0x49, 0x4d, 0x03, (byte) 0xed};
private byte[][] icc;
// Constructors
Jpeg(Image image) {
super(image);
}
/**
* Constructs a Jpeg-object, using an url.
*
* @param url the URL where the image can be found
* @throws BadElementException
* @throws IOException
*/
public Jpeg(URL url) throws BadElementException, IOException {
super(url);
processParameters();
}
/**
* Constructs a Jpeg-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 Jpeg-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 InputStream.
*
* @param is the InputStream
* @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: VALID_MARKER, UNSUPPORTED_MARKER or NOPARAM_MARKER
*/
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(MessageLocalization.getComposedMessage("1.is.not.a.valid.jpeg.file", errorID));
}
boolean firstPass = true;
int len;
while (true) {
int v = is.read();
if (v < 0)
throw new IOException(MessageLocalization.getComposedMessage("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(MessageLocalization.getComposedMessage("1.corrupted.jfif.marker", errorID));
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)(dx * 2.54f + 0.5f);
dpiY = (int)(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;
// some jpeg producers don't know how to count to 1
if (order < 1)
order = 1;
if (count < 1)
count = 1;
if (icc == null)
icc = new byte[count][];
icc[order - 1] = byteapp2;
}
}
continue;
}
if (marker == M_APPD) {
len = getShort(is) - 2;
byte[] byteappd = new byte[len];
for (int k = 0; k < len; k++) {
byteappd[k] = (byte)is.read();
}
// search for '8BIM Resolution' marker
int k = 0;
for (k = 0; k < len-PS_8BIM_RESO.length; k++) {
boolean found = true;
for (int j = 0; j < PS_8BIM_RESO.length; j++) {
if (byteappd[k+j] != PS_8BIM_RESO[j]) {
found = false;
break;
}
}
if (found)
break;
}
k+=PS_8BIM_RESO.length;
if (k < len-PS_8BIM_RESO.length) {
// "PASCAL String" for name, i.e. string prefix with length byte
// padded to be even length; 2 null bytes if empty
byte namelength = byteappd[k];
// add length byte
namelength++;
// add padding
if (namelength % 2 == 1)
namelength++;
// just skip name
k += namelength;
// size of the resolution data
int resosize = (byteappd[k] << 24) + (byteappd[k+1] << 16) + (byteappd[k+2] << 8) + byteappd[k+3];
// should be 16
if (resosize != 16) {
// fail silently, for now
//System.err.println("DEBUG: unsupported resolution IRB size");
continue;
}
k+=4;
int dx = (byteappd[k] << 8) + (byteappd[k+1] & 0xff);
k+=2;
// skip 2 unknown bytes
k+=2;
int unitsx = (byteappd[k] << 8) + (byteappd[k+1] & 0xff);
k+=2;
// skip 2 unknown bytes
k+=2;
int dy = (byteappd[k] << 8) + (byteappd[k+1] & 0xff);
k+=2;
// skip 2 unknown bytes
k+=2;
int unitsy = (byteappd[k] << 8) + (byteappd[k+1] & 0xff);
if (unitsx == 1 || unitsx == 2) {
dx = (unitsx == 2 ? (int)(dx * 2.54f + 0.5f) : dx);
// make sure this is consistent with JFIF data
if (dpiX != 0 && dpiX != dx) {
//System.err.println("DEBUG: inconsistent metadata (dpiX: " + dpiX + " vs " + dx + ")");
}
else
dpiX = dx;
}
if (unitsy == 1 || unitsy == 2) {
dy = (unitsy == 2 ? (int)(dy * 2.54f + 0.5f) : dy);
// make sure this is consistent with JFIF data
if (dpiY != 0 && dpiY != dy) {
//System.err.println("DEBUG: inconsistent metadata (dpiY: " + dpiY + " vs " + dy + ")");
}
else
dpiY = dy;
}
}
continue;
}
firstPass = false;
int markertype = marker(marker);
if (markertype == VALID_MARKER) {
Utilities.skip(is, 2);
if (is.read() != 0x08) {
throw new BadElementException(MessageLocalization.getComposedMessage("1.must.have.8.bits.per.component", errorID));
}
scaledHeight = getShort(is);
setTop(scaledHeight);
scaledWidth = getShort(is);
setRight(scaledWidth);
colorspace = is.read();
bpc = 8;
break;
}
else if (markertype == UNSUPPORTED_MARKER) {
throw new BadElementException(MessageLocalization.getComposedMessage("1.unsupported.jpeg.marker.2", errorID, String.valueOf(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;
}
try {
ICC_Profile icc_prof = ICC_Profile.getInstance(ficc, colorspace);
tagICC(icc_prof);
}
catch(IllegalArgumentException e) {
// ignore ICC profile if it's invalid.
}
icc = null;
}
}
}
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