/*
 * Copyright 
 *   2007 axYus - www.axyus.com
 *   2007 C.Marchand - christophe.marchand@axyus.com
 * 
 * This file is part of XEMELIOS.
 * 
 * XEMELIOS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * XEMELIOS 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with XEMELIOS; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package fr.gouv.finances.cp.utils;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import fr.gouv.finances.cp.xemelios.common.Constants;

/**
 * @author chm
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class IoUtils {
	public static InputStream getInputStream(String fileName) throws IOException {
//	    File dir = new File(System.getProperty(Constants.SYS_PROP_DOC_DEF_DIR));
//	    File f = new File(dir,fileName);
	    File f = new File(fileName);
	    if(!f.exists()) throw new IOException("File not found: "+fileName);
	    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
	    byte[] b = new byte[256];
	    StringBuffer buff = new StringBuffer();
	    int read = bis.read(b);
	    while(read>0) {
	        buff.append(new String(b,0,read));
	        read = bis.read(b);
	    }
	    // on remplace 
	    String ret = buff.toString().replaceAll("@@XSL_LOCATION@@","file:///"+f.getPath().replace('\\','/'));
	    String encoding = getEncoding(ret);
	    return new ByteArrayInputStream(ret.getBytes(encoding));
	}
    public static String getEncoding(String buffer) {
        String ret = "UTF-8";
        String buff = new String(buffer);
        try {
	        buff = buff.substring(buff.indexOf("<?"));
	        buff = buff.substring(0,buff.indexOf("?>")+2);
	        String header = buff;
	        int encodingPos = header.indexOf("encoding=");
	        if(encodingPos>=0) {
	            String s = header.substring(encodingPos+9);
	            if(s.startsWith("\"")) {
	                ret=s.substring(1,s.indexOf('"',1));
	            } else {
	                s = s.substring(0,s.length()-2).trim();
	                if(s.indexOf(' ')>0) ret = s.substring(0,s.indexOf(' '));
	                else ret = s;
	            }
	        }
        } catch(Throwable t) {
            // ignore all errors, a default value is provided
        }
        return ret;
    }

}
