org.krysalis.barcode4j.tools.URLUtil Maven / Gradle / Ivy
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Barcode4J is a flexible generator for barcodes written in Java.
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/*
* Copyright 2008 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: URLUtil.java,v 1.1 2008/09/15 07:10:28 jmaerki Exp $ */
package org.krysalis.barcode4j.tools;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLDecoder;
/**
* Utility functions for handling URLs.
*/
public class URLUtil {
private static final String DATA_PROTOCOL = "data:";
/**
* Returns the data pointed at by a URL as a byte array.
* @param url the URL
* @param encoding the encoding to use for converting text content to binary content
* @return the data as a byte array
* @throws IOException if an I/O error occurs
*/
public static byte[] getData(String url, String encoding) throws IOException {
if (url.startsWith(DATA_PROTOCOL)) {
return parseDataURL(url, encoding);
} else {
URL u = new URL(url);
InputStream in = u.openStream();
try {
ByteArrayOutputStream baout = new ByteArrayOutputStream();
IOUtil.copy(in, baout);
return baout.toByteArray();
} finally {
IOUtil.closeQuietly(in);
}
}
}
private static byte[] parseDataURL(String url, String encoding) throws IOException {
int commaPos = url.indexOf(',');
// header is of the form data:[][;base64]
String header = url.substring(0, commaPos);
String data = url.substring(commaPos + 1);
if (header.endsWith(";base64")) {
Base64InputStream in = new Base64InputStream(
new java.io.StringReader(data));
ByteArrayOutputStream baout = new ByteArrayOutputStream();
IOUtil.copy(in, baout);
IOUtil.closeQuietly(in);
return baout.toByteArray();
} else {
String urlEncoding = "US-ASCII";
final int charsetpos = header.indexOf(";charset=");
if (charsetpos > 0) {
urlEncoding = header.substring(charsetpos + 9);
int pos = urlEncoding.indexOf(';');
if (pos > 0) {
urlEncoding = urlEncoding.substring(0, pos);
}
}
final String unescapedString = URLDecoder.decode(data, urlEncoding);
byte[] bytes = unescapedString.getBytes(encoding);
return bytes;
}
}
}