Mega Code Archive
Get file encoding
<![CDATA[
/*
* Copyright (c) 2006, Chuck Mortimore - xmldap.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the names xmldap, xmldap.org, xmldap.com nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
*
* Functions to read XML files considering byte order marks
*
*/
//package org.xmldap.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class XmlFileUtil {
public static int getBomLength(byte[] b) {
int b0 = 0;
int b1 = 0;
if (b.length > 2) {
b0 = b[0] & 0xFF;
b1 = b[1] & 0xFF;
if (b0 == 0xFE && b1 == 0xFF) {
return 2;
} else if (b0 == 0xFF && b1 == 0xFE) {
return 2;
}
} else {
return 0;
}
if (b.length > 3) {
final int b2 = b[2] & 0xFF;
if (b0 != 0xEF || b1 != 0xBB || b2 != 0xBF) {
return 0;
} else {
return 3;
}
}
return 0;
}
public static String getEncoding(byte[] b) {
int b0 = 0;
int b1 = 0;
if (b.length > 2) {
b0 = b[0] & 0xFF;
b1 = b[1] & 0xFF;
if (b0 == 0xFE && b1 == 0xFF) {
return "UTF-16BE";
} else if (b0 == 0xFF && b1 == 0xFE) {
return "UTF-16LE";
}
} else {
return null;
}
if (b.length > 3) {
final int b2 = b[2] & 0xFF;
if (b0 != 0xEF || b1 != 0xBB || b2 != 0xBF) {
return null;
} else {
return "UTF-8";
}
}
return null;
}
/**
* Removes the byte order mark from the stream, if it exists and returns the
* encoding name.
*
* Adapted code from org/apache/xerces/xinclude/XIncludeTextReader.java
*
* If null is returned then some bytes were read but they were no BOM bytes.
* You have to reset the stream in this case. I don't do that here because
* mark/reset is not implemented on all plattforms (windows)
*
* @param stream
* @return
* @throws IOException
*/
public static String getEncoding(InputStream stream) throws IOException {
stream.mark(4);
byte[] b = new byte[3];
int count = 0;
int b0 = 0;
int b1 = 0;
count = stream.read(b, 0, 2);
if (count == 2) {
b0 = b[0] & 0xFF;
b1 = b[1] & 0xFF;
if (b0 == 0xFE && b1 == 0xFF) {
return "UTF-16BE";
} else if (b0 == 0xFF && b1 == 0xFE) {
return "UTF-16LE";
}
} else {
return null;
}
byte[] B = new byte[1];
count = stream.read(B, 0, 1);
if (count == 1) {
final int b2 = B[0] & 0xFF;
if (b0 != 0xEF || b1 != 0xBB || b2 != 0xBF) {
// First three bytes are not BOM, so reset.
stream.reset();
} else {
return "UTF-8";
}
}
return null;
}
static public String doRead(InputStream in) throws IOException {
BufferedReader ins = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
try {
int c = -1;
char[] charBuf = null;
while (true) {
int len = in.available();
if (len > 0) {
if (charBuf == null) {
charBuf = new char[len];
} else {
if (len > charBuf.length) {
charBuf = new char[len];
}
}
} else {
// available is not always relyable
if (charBuf == null) {
charBuf = new char[2048];
} else {
if (2048 > charBuf.length) {
charBuf = new char[2048];
}
}
}
c = ins.read(charBuf, 0, charBuf.length);
if (c == -1) {
break;
} else {
sb.append(charBuf, 0, c);
}
}
} finally {
try {
in.close();
} catch (IOException e) {
}
try {
ins.close();
} catch (IOException e) {
}
}
return sb.toString();
}
}
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