Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * $Id: XMLUtilities.java,v 1.28 2005/09/05 13:58:15 gmcgoldrick Exp $
 *
 * Copyright (C) 2002, Cladonia Ltd. All rights reserved.
 *
 * This software is the proprietary information of Cladonia Ltd.  
 * Use is subject to license terms.
 */

import java.io.IOException;
import java.io.InputStream;

import java.nio.charset.Charset;

import java.util.SortedMap;

public class Main {
    private static final String UTF_8 = "UTF-8";
    private static final String UTF_16BE = "UTF-16BE";
    private static final String UTF_16LE = "UTF-16LE";
    private static final String EBCDIC = "EBCDIC-CP-US";
    private static final String UCS_4BE = "UCS-4BE";
    private static final String UCS_4LE = "UCS-4LE";
    private static final String UNKNOWN = null;

    public static String getStreamEncoding(InputStream stream) throws IOException {
        String encoding = null;
        boolean DEBUG = false;

        if (DEBUG) {
            SortedMap map = Charset.availableCharsets();
            Object[] keys = map.keySet().toArray();

            for (int i = 0; i < keys.length; i++) {
                System.out.println("Key = " + keys[i] + " Value = " + map.get(keys[i]));
            }
        }

        int ch = stream.read();
        if (DEBUG)
            System.out.print("[" + ch + "]");

        // UCS-4 Big Endian (1234)
        if (ch == 0x00) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0x00) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0xFE) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0xFF) {
                        encoding = UCS_4BE;
                    }
                } else if (ch == 0xFF) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0xFE) {
                        encoding = UNKNOWN;
                    }
                } else if (ch == 0x00) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x3C) {
                        encoding = UCS_4BE;
                    }
                } else if (ch == 0x3C) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UNKNOWN;
                    }
                }
            } else if (ch == 0x3C) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0x00) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UNKNOWN;
                    } else if (ch == 0x3F) {
                        encoding = UTF_16BE;
                    }
                }
            }
        } else if (ch == 0x3C) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0x00) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0x00) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UCS_4LE;
                    }
                } else if (ch == 0x3F) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UTF_16LE;
                    }
                }
            } else if (ch == 0x3F) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0x78) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x6D) {
                        encoding = UTF_8;
                    }
                }
            }
        } else if (ch == 0xFF) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0xFE) {
                ch = stream.read();
                encoding = UTF_16LE;
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0x00) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UCS_4LE;
                    }
                }
            }
        } else if (ch == 0xFE) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0xFF) {
                ch = stream.read();

                encoding = UTF_16BE;
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0x00) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x00) {
                        encoding = UNKNOWN;
                    }
                }
            }
        } else if (ch == 0xEF) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0xBB) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0xBF) {
                    //               System.out.println( "Found UTF-8 byte order mark.");
                    // strip utf-8 byte order mark
                    stream.mark(1024);
                    encoding = UTF_8;
                }
            }
        } else if (ch == 0x4C) {
            ch = stream.read();
            if (DEBUG)
                System.out.print("[" + ch + "]");
            if (ch == 0x6F) {
                ch = stream.read();
                if (DEBUG)
                    System.out.print("[" + ch + "]");
                if (ch == 0xA7) {
                    ch = stream.read();
                    if (DEBUG)
                        System.out.print("[" + ch + "]");
                    if (ch == 0x94) {
                        encoding = EBCDIC;
                    }
                }
            }
        }

        if (DEBUG)
            System.out.println("getStreamEncoding() [" + encoding + "]");
        return encoding;
    }
}