239 lines
8.7 KiB
C#
239 lines
8.7 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: Jpeg2000.cs,v 1.5 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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/**
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* An <CODE>Jpeg2000</CODE> is the representation of a graphic element (JPEG)
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* that has to be inserted into the document
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*
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* @see Element
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* @see Image
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*/
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public class Jpeg2000 : Image {
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// public static final membervariables
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public const int JP2_JP = 0x6a502020;
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public const int JP2_IHDR = 0x69686472;
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public const int JPIP_JPIP = 0x6a706970;
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public const int JP2_FTYP = 0x66747970;
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public const int JP2_JP2H = 0x6a703268;
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public const int JP2_COLR = 0x636f6c72;
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public const int JP2_JP2C = 0x6a703263;
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public const int JP2_URL = 0x75726c20;
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public const int JP2_DBTL = 0x6474626c;
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public const int JP2_BPCC = 0x62706363;
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public const int JP2_JP2 = 0x6a703220;
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private Stream inp;
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private int boxLength;
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private int boxType;
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// Constructors
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public Jpeg2000(Image image) : base(image) {
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}
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/**
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* Constructs a <CODE>Jpeg2000</CODE>-object, using an <VAR>url</VAR>.
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*
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* @param url the <CODE>URL</CODE> where the image can be found
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* @throws BadElementException
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* @throws IOException
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*/
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public Jpeg2000(Uri url) : base(url) {
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ProcessParameters();
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}
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/**
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* Constructs a <CODE>Jpeg2000</CODE>-object from memory.
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*
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* @param img the memory image
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* @throws BadElementException
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* @throws IOException
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*/
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public Jpeg2000(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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/**
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* Constructs a <CODE>Jpeg2000</CODE>-object from memory.
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*
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* @param img the memory image.
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* @param width the width you want the image to have
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* @param height the height you want the image to have
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* @throws BadElementException
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* @throws IOException
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*/
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public Jpeg2000(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 int Cio_read(int n) {
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int v = 0;
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for (int i = n - 1; i >= 0; i--) {
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v += inp.ReadByte() << (i << 3);
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}
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return v;
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}
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public void Jp2_read_boxhdr() {
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boxLength = Cio_read(4);
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boxType = Cio_read(4);
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if (boxLength == 1) {
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if (Cio_read(4) != 0) {
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throw new IOException("Cannot handle box sizes higher than 2^32");
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}
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boxLength = Cio_read(4);
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if (boxLength == 0)
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throw new IOException("Unsupported box size == 0");
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}
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else if (boxLength == 0) {
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throw new IOException("Unsupported box size == 0");
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}
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}
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/**
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* This method checks if the image is a valid JPEG and processes some parameters.
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* @throws BadElementException
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* @throws IOException
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*/
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private void ProcessParameters() {
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type = JPEG2000;
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originalType = ORIGINAL_JPEG2000;
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inp = 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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inp = w.GetResponse().GetResponseStream();
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errorID = url.ToString();
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}
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else{
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inp = new MemoryStream(rawData);
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errorID = "Byte array";
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}
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boxLength = Cio_read(4);
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if (boxLength == 0x0000000c) {
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boxType = Cio_read(4);
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if (JP2_JP != boxType) {
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throw new IOException("Expected JP Marker");
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}
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if (0x0d0a870a != Cio_read(4)) {
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throw new IOException("Error with JP Marker");
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}
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Jp2_read_boxhdr();
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if (JP2_FTYP != boxType) {
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throw new IOException("Expected FTYP Marker");
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}
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Utilities.Skip(inp, boxLength - 8);
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Jp2_read_boxhdr();
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do {
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if (JP2_JP2H != boxType) {
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if (boxType == JP2_JP2C) {
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throw new IOException("Expected JP2H Marker");
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}
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Utilities.Skip(inp, boxLength - 8);
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Jp2_read_boxhdr();
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}
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} while (JP2_JP2H != boxType);
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Jp2_read_boxhdr();
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if (JP2_IHDR != boxType) {
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throw new IOException("Expected IHDR Marker");
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}
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scaledHeight = Cio_read(4);
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Top = scaledHeight;
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scaledWidth = Cio_read(4);
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Right = scaledWidth;
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bpc = -1;
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}
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else if ((uint)boxLength == 0xff4fff51) {
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Utilities.Skip(inp, 4);
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int x1 = Cio_read(4);
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int y1 = Cio_read(4);
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int x0 = Cio_read(4);
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int y0 = Cio_read(4);
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Utilities.Skip(inp, 16);
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colorspace = Cio_read(2);
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bpc = 8;
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scaledHeight = y1 - y0;
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Top = scaledHeight;
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scaledWidth = x1 - x0;
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Right = scaledWidth;
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}
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else {
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throw new IOException("Not a valid Jpeg2000 file");
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}
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}
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finally {
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if (inp != null) {
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try{inp.Close();}catch{}
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inp = null;
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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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}
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}
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} |