Returns the IANA encoding name that is auto-detected from the bytes specified, with the endian-ness of that encoding where appropriate. - Java XML

Java examples for XML:XML Encoding

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Description

Returns the IANA encoding name that is auto-detected from the bytes specified, with the endian-ness of that encoding where appropriate.

Demo Code

/*// w w  w  .  ja  v  a 2 s  .c  om
 * $Id: c252e97234599bbc2c9094ce3ee83beaa8e24d93 $
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 * This file is part of the iText (R) project.
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 * Authors: Bruno Lowagie, Paulo Soares, Balder Van Camp, et al.
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//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] b4 = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(getEncodingName(b4));
    }

    /**
     * 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(final 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";
    }
}

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