using System;
using System.IO;
using System.Net;
using System.util;
using iTextSharp.text.pdf;
using iTextSharp.text.error_messages;
/*
 * $Id: Jpeg2000.cs 106 2009-12-07 12:23:50Z psoares33 $
 * 
 *
 * This file is part of the iText project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * 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 1T3XT,
 * 1T3XT 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,
 * you 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: sales@itextpdf.com
 */

namespace iTextSharp.text {

    /**
    * An <CODE>Jpeg2000</CODE> is the representation of a graphic element (JPEG)
    * that has to be inserted into the document
    *
    * @see		Element
    * @see		Image
    */

    public class Jpeg2000 : Image {
        
        // public static final membervariables
        
        public const int JP2_JP = 0x6a502020;
        public const int JP2_IHDR = 0x69686472;
        public const int JPIP_JPIP = 0x6a706970;

        public const int JP2_FTYP = 0x66747970;
        public const int JP2_JP2H = 0x6a703268;
        public const int JP2_COLR = 0x636f6c72;
        public const int JP2_JP2C = 0x6a703263;
        public const int JP2_URL = 0x75726c20;
        public const int JP2_DBTL = 0x6474626c;
        public const int JP2_BPCC = 0x62706363;
        public const int JP2_JP2 = 0x6a703220;

        private Stream inp;
        private int boxLength;
        private int boxType;
        
        // Constructors
        
        public Jpeg2000(Image image) : base(image) {
        }

        /**
        * Constructs a <CODE>Jpeg2000</CODE>-object, using an <VAR>url</VAR>.
        *
        * @param		url			the <CODE>URL</CODE> where the image can be found
        * @throws BadElementException
        * @throws IOException
        */
        public Jpeg2000(Uri url) : base(url) {
            ProcessParameters();
        }
        
        /**
        * Constructs a <CODE>Jpeg2000</CODE>-object from memory.
        *
        * @param		img		the memory image
        * @throws BadElementException
        * @throws IOException
        */
        
        public Jpeg2000(byte[] img) : base((Uri)null) {
            rawData = img;
            originalData = img;
            ProcessParameters();
        }
        
        /**
        * Constructs a <CODE>Jpeg2000</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 Jpeg2000(byte[] img, float width, float height) : this(img) {
            scaledWidth = width;
            scaledHeight = height;
        }
        
        private int Cio_read(int n) {
            int v = 0;
            for (int i = n - 1; i >= 0; i--) {
                v += inp.ReadByte() << (i << 3);
            }
            return v;
        }
        
        public void Jp2_read_boxhdr() {
            boxLength = Cio_read(4);
            boxType = Cio_read(4);
            if (boxLength == 1) {
                if (Cio_read(4) != 0) {
                    throw new IOException(MessageLocalization.GetComposedMessage("cannot.handle.box.sizes.higher.than.2.32"));
                }
                boxLength = Cio_read(4);
                if (boxLength == 0) 
                    throw new IOException(MessageLocalization.GetComposedMessage("unsupported.box.size.eq.eq.0"));
            }
            else if (boxLength == 0) {
                throw new IOException(MessageLocalization.GetComposedMessage("unsupported.box.size.eq.eq.0"));
            }
        }
        
        /**
        * This method checks if the image is a valid JPEG and processes some parameters.
        * @throws BadElementException
        * @throws IOException
        */
        private void ProcessParameters() {
            type = JPEG2000;
            originalType = ORIGINAL_JPEG2000;
            inp = null;
            try {
                string errorID;
                if (rawData == null){
                    WebRequest w = WebRequest.Create(url);
                    w.Credentials = CredentialCache.DefaultCredentials;
                    inp = w.GetResponse().GetResponseStream();
                    errorID = url.ToString();
                }
                else{
                    inp = new MemoryStream(rawData);
                    errorID = "Byte array";
                }
                boxLength = Cio_read(4);
                if (boxLength == 0x0000000c) {
                    boxType = Cio_read(4);
                    if (JP2_JP != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.jp.marker"));
                    }
                    if (0x0d0a870a != Cio_read(4)) {
                        throw new IOException(MessageLocalization.GetComposedMessage("error.with.jp.marker"));
                    }

                    Jp2_read_boxhdr();
                    if (JP2_FTYP != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.ftyp.marker"));
                    }
                    Utilities.Skip(inp, boxLength - 8);
                    Jp2_read_boxhdr();
                    do {
                        if (JP2_JP2H != boxType) {
                            if (boxType == JP2_JP2C) {
                                throw new IOException(MessageLocalization.GetComposedMessage("expected.jp2h.marker"));
                            }
                            Utilities.Skip(inp, boxLength - 8);
                            Jp2_read_boxhdr();
                        }
                    } while (JP2_JP2H != boxType);
                    Jp2_read_boxhdr();
                    if (JP2_IHDR != boxType) {
                        throw new IOException(MessageLocalization.GetComposedMessage("expected.ihdr.marker"));
                    }
                    scaledHeight = Cio_read(4);
                    Top = scaledHeight;
                    scaledWidth = Cio_read(4);
                    Right = scaledWidth;
                    bpc = -1;
                }
                else if ((uint)boxLength == 0xff4fff51) {
                    Utilities.Skip(inp, 4);
                    int x1 = Cio_read(4);
                    int y1 = Cio_read(4);
                    int x0 = Cio_read(4);
                    int y0 = Cio_read(4);
                    Utilities.Skip(inp, 16);
                    colorspace = Cio_read(2);
                    bpc = 8;
                    scaledHeight = y1 - y0;
                    Top = scaledHeight;
                    scaledWidth = x1 - x0;
                    Right = scaledWidth;
                }
                else {
                    throw new IOException(MessageLocalization.GetComposedMessage("not.a.valid.jpeg2000.file"));
                }
            }
            finally {
                if (inp != null) {
                    try{inp.Close();}catch{}
                    inp = null;
                }
            }
            plainWidth = this.Width;
            plainHeight = this.Height;
        }
    }
}
