336 lines
14 KiB
C#
336 lines
14 KiB
C#
using System;
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using System.IO;
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using System.Net;
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using System.util;
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using iTextSharp.text.pdf;
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/*
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* $Id: Jpeg.cs,v 1.11 2008/05/13 11:25:11 psoares33 Exp $
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*
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*
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* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text {
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/// <summary>
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/// An Jpeg is the representation of a graphic element (JPEG)
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/// that has to be inserted into the document
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/// </summary>
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/// <seealso cref="T:iTextSharp.text.Element"/>
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/// <seealso cref="T:iTextSharp.text.Image"/>
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/// <seealso cref="T:iTextSharp.text.Gif"/>
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/// <seealso cref="T:iTextSharp.text.Png"/>
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public class Jpeg : Image {
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// public static membervariables
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/// <summary> This is a type of marker. </summary>
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public const int NOT_A_MARKER = -1;
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/// <summary> This is a type of marker. </summary>
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public const int VALID_MARKER = 0;
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/// <summary> Acceptable Jpeg markers. </summary>
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public static int[] VALID_MARKERS = {0xC0, 0xC1, 0xC2};
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/// <summary> This is a type of marker. </summary>
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public const int UNSUPPORTED_MARKER = 1;
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/// <summary> Unsupported Jpeg markers. </summary>
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public static int[] UNSUPPORTED_MARKERS = {0xC3, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCD, 0xCE, 0xCF};
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/// <summary> This is a type of marker. </summary>
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public const int NOPARAM_MARKER = 2;
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/// <summary> Jpeg markers without additional parameters. </summary>
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public static int[] NOPARAM_MARKERS = {0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0x01};
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public const int M_APP0 = 0xE0;
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public const int M_APP2 = 0xE2;
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public const int M_APPE = 0xEE;
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public static byte[] JFIF_ID = {0x4A, 0x46, 0x49, 0x46, 0x00};
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private byte[][] icc;
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// Constructors
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/// <summary>
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/// Construct a Jpeg-object, using a Image
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/// </summary>
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/// <param name="image">a Image</param>
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public Jpeg(Image image) : base(image) {}
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/// <summary>
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/// Constructs a Jpeg-object, using an Uri.
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/// </summary>
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/// <remarks>
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/// Deprecated, use Image.GetInstance(...) to create an Image
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/// </remarks>
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/// <param name="Uri">the Uri where the image can be found</param>
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public Jpeg(Uri Uri) : base(Uri) {
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ProcessParameters();
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}
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/// <summary>
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/// Constructs a Jpeg-object from memory.
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/// </summary>
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/// <param name="img">the memory image</param>
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public Jpeg(byte[] img) : base((Uri)null) {
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rawData = img;
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originalData = img;
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ProcessParameters();
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}
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/// <summary>
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/// Constructs a Jpeg-object from memory.
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/// </summary>
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/// <param name="img">the memory image.</param>
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/// <param name="width">the width you want the image to have</param>
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/// <param name="height">the height you want the image to have</param>
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public Jpeg(byte[] img, float width, float height) : this(img) {
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scaledWidth = width;
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scaledHeight = height;
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}
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// private static methods
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/// <summary>
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/// Reads a short from the Stream.
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/// </summary>
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/// <param name="istr">the Stream</param>
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/// <returns>an int</returns>
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private static int GetShort(Stream istr) {
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return (istr.ReadByte() << 8) + istr.ReadByte();
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}
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/// <summary>
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/// Reads an inverted short from the Stream.
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/// </summary>
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/// <param name="istr">the Stream</param>
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/// <returns>an int</returns>
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private static int GetShortInverted(Stream istr) {
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return (istr.ReadByte() + istr.ReadByte() << 8);
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}
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/// <summary>
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/// Returns a type of marker.
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/// </summary>
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/// <param name="marker">an int</param>
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/// <returns>a type: VALID_MARKER, UNSUPPORTED_MARKER or NOPARAM_MARKER</returns>
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private static int MarkerType(int marker) {
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for (int i = 0; i < VALID_MARKERS.Length; i++) {
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if (marker == VALID_MARKERS[i]) {
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return VALID_MARKER;
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}
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}
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for (int i = 0; i < NOPARAM_MARKERS.Length; i++) {
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if (marker == NOPARAM_MARKERS[i]) {
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return NOPARAM_MARKER;
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}
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}
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for (int i = 0; i < UNSUPPORTED_MARKERS.Length; i++) {
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if (marker == UNSUPPORTED_MARKERS[i]) {
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return UNSUPPORTED_MARKER;
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}
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}
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return NOT_A_MARKER;
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}
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// private methods
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/// <summary>
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/// This method checks if the image is a valid JPEG and processes some parameters.
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/// </summary>
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private void ProcessParameters() {
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type = Element.JPEG;
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originalType = ORIGINAL_JPEG;
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Stream istr = null;
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try {
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string errorID;
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if (rawData == null){
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WebRequest w = WebRequest.Create(url);
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istr = w.GetResponse().GetResponseStream();
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errorID = url.ToString();
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}
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else{
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istr = new MemoryStream(rawData);
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errorID = "Byte array";
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}
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if (istr.ReadByte() != 0xFF || istr.ReadByte() != 0xD8) {
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throw new BadElementException(errorID + " is not a valid JPEG-file.");
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}
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bool firstPass = true;
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int len;
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while (true) {
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int v = istr.ReadByte();
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if (v < 0)
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throw new IOException("Premature EOF while reading JPG.");
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if (v == 0xFF) {
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int marker = istr.ReadByte();
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if (firstPass && marker == M_APP0) {
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firstPass = false;
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len = GetShort(istr);
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if (len < 16) {
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Utilities.Skip(istr, len - 2);
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continue;
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}
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byte[] bcomp = new byte[JFIF_ID.Length];
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int r = istr.Read(bcomp, 0, bcomp.Length);
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if (r != bcomp.Length)
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throw new BadElementException(errorID + " corrupted JFIF marker.");
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bool found = true;
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for (int k = 0; k < bcomp.Length; ++k) {
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if (bcomp[k] != JFIF_ID[k]) {
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found = false;
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break;
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}
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}
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if (!found) {
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Utilities.Skip(istr, len - 2 - bcomp.Length);
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continue;
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}
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Utilities.Skip(istr, 2);
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int units = istr.ReadByte();
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int dx = GetShort(istr);
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int dy = GetShort(istr);
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if (units == 1) {
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dpiX = dx;
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dpiY = dy;
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}
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else if (units == 2) {
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dpiX = (int)((float)dx * 2.54f + 0.5f);
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dpiY = (int)((float)dy * 2.54f + 0.5f);
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}
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Utilities.Skip(istr, len - 2 - bcomp.Length - 7);
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continue;
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}
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if (marker == M_APPE) {
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len = GetShort(istr) - 2;
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byte[] byteappe = new byte[len];
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for (int k = 0; k < len; ++k) {
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byteappe[k] = (byte)istr.ReadByte();
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}
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if (byteappe.Length >= 12) {
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string appe = System.Text.ASCIIEncoding.ASCII.GetString(byteappe,0,5);
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if (Util.EqualsIgnoreCase(appe, "adobe")) {
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invert = true;
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}
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}
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continue;
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}
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if (marker == M_APP2) {
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len = GetShort(istr) - 2;
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byte[] byteapp2 = new byte[len];
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for (int k = 0; k < len; ++k) {
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byteapp2[k] = (byte)istr.ReadByte();
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}
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if (byteapp2.Length >= 14) {
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String app2 = System.Text.ASCIIEncoding.ASCII.GetString(byteapp2, 0, 11);
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if (app2.Equals("ICC_PROFILE")) {
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int order = byteapp2[12] & 0xff;
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int count = byteapp2[13] & 0xff;
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if (icc == null)
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icc = new byte[count][];
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icc[order - 1] = byteapp2;
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}
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}
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continue;
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}
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firstPass = false;
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int markertype = MarkerType(marker);
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if (markertype == VALID_MARKER) {
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Utilities.Skip(istr, 2);
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if (istr.ReadByte() != 0x08) {
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throw new BadElementException(errorID + " must have 8 bits per component.");
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}
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scaledHeight = GetShort(istr);
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Top = scaledHeight;
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scaledWidth = GetShort(istr);
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Right = scaledWidth;
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colorspace = istr.ReadByte();
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bpc = 8;
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break;
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}
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else if (markertype == UNSUPPORTED_MARKER) {
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throw new BadElementException(errorID + ": unsupported JPEG marker: " + marker);
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}
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else if (markertype != NOPARAM_MARKER) {
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Utilities.Skip(istr, GetShort(istr) - 2);
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}
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}
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}
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}
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finally {
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if (istr != null) {
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istr.Close();
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}
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}
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plainWidth = this.Width;
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plainHeight = this.Height;
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if (icc != null) {
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int total = 0;
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for (int k = 0; k < icc.Length; ++k) {
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if (icc[k] == null) {
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icc = null;
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return;
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}
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total += icc[k].Length - 14;
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}
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byte[] ficc = new byte[total];
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total = 0;
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for (int k = 0; k < icc.Length; ++k) {
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System.Array.Copy(icc[k], 14, ficc, total, icc[k].Length - 14);
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total += icc[k].Length - 14;
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}
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ICC_Profile icc_prof = ICC_Profile.GetInstance(ficc);
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TagICC = icc_prof;
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icc = null;
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}
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}
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}
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}
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