Get Encoding Name from byte array - CSharp File IO

CSharp examples for File IO:Text File

  1. HOME
  2. CSharp
  3. File IO
  4. Text File

Description

Get Encoding Name from byte array

Demo Code

/*//from  w  ww  . ja va2  s.c  o m
 * $Id$
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2015 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: sales@itextpdf.com
 */
using System.Text;
using System;

public class Main{
        /**
         * Returns the IANA encoding name that is auto-detected from
         * the bytes specified, with the endian-ness of that encoding where appropriate.
         * (method found in org.apache.xerces.impl.XMLEntityManager, originally published
         * by the Apache Software Foundation under the Apache Software License; now being
         * used in iText under the MPL)
         * @param b4    The first four bytes of the input.
         * @return an IANA-encoding string
         * @since 5.0.6
         */
        public static String GetEncodingName(byte[] b4) {

            // UTF-16, with BOM
            int b0 = b4[0] & 0xFF;
            int b1 = b4[1] & 0xFF;
            if (b0 == 0xFE && b1 == 0xFF) {
                // UTF-16, big-endian
                return "UTF-16BE";
            }
            if (b0 == 0xFF && b1 == 0xFE) {
                // UTF-16, little-endian
                return "UTF-16LE";
            }

            // UTF-8 with a BOM
            int b2 = b4[2] & 0xFF;
            if (b0 == 0xEF && b1 == 0xBB && b2 == 0xBF) {
                return "UTF-8";
            }

            // other encodings
            int b3 = b4[3] & 0xFF;
            if (b0 == 0x00 && b1 == 0x00 && b2 == 0x00 && b3 == 0x3C) {
                // UCS-4, big endian (1234)
                return "ISO-10646-UCS-4";
            }
            if (b0 == 0x3C && b1 == 0x00 && b2 == 0x00 && b3 == 0x00) {
                // UCS-4, little endian (4321)
                return "ISO-10646-UCS-4";
            }
            if (b0 == 0x00 && b1 == 0x00 && b2 == 0x3C && b3 == 0x00) {
                // UCS-4, unusual octet order (2143)
                // REVISIT: What should this be?
                return "ISO-10646-UCS-4";
            }
            if (b0 == 0x00 && b1 == 0x3C && b2 == 0x00 && b3 == 0x00) {
                // UCS-4, unusual octet order (3412)
                // REVISIT: What should this be?
                return "ISO-10646-UCS-4";
            }
            if (b0 == 0x00 && b1 == 0x3C && b2 == 0x00 && b3 == 0x3F) {
                // UTF-16, big-endian, no BOM
                // (or could turn out to be UCS-2...
                // REVISIT: What should this be?
                return "UTF-16BE";
            }
            if (b0 == 0x3C && b1 == 0x00 && b2 == 0x3F && b3 == 0x00) {
                // UTF-16, little-endian, no BOM
                // (or could turn out to be UCS-2...
                return "UTF-16LE";
            }
            if (b0 == 0x4C && b1 == 0x6F && b2 == 0xA7 && b3 == 0x94) {
                // EBCDIC
                // a la xerces1, return CP037 instead of EBCDIC here
                return "CP037";
            }

            // default encoding
            return "UTF-8";
        }
}

Related Tutorials