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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.io.Writer;
import org.apache.commons.io.IOUtils;
import org.apache.xmlgraphics.util.io.Base64EncodeStream;
/**
* Utility classes for generating RFC 2397 data URLs.
*/
public class DataURLUtil {
/**
* Creates a new data URL and returns it as a String.
* @param in the InputStream to read the data from
* @param mediatype the MIME type of the content, or null
* @return the newly created data URL
* @throws IOException if an I/O error occurs
*/
public static String createDataURL(InputStream in, String mediatype) throws IOException {
StringWriter writer = new StringWriter();
writeDataURL(in, mediatype, writer);
return writer.toString();
}
/**
* Generates a data URL and writes it to a Writer.
* @param in the InputStream to read the data from
* @param mediatype the MIME type of the content, or null
* @param writer the Writer to write to
* @throws IOException if an I/O error occurs
*/
public static void writeDataURL(InputStream in, String mediatype, Writer writer)
throws IOException {
writer.write("data:");
if (mediatype != null) {
writer.write(mediatype);
}
writer.write(";base64,");
Base64EncodeStream out = new Base64EncodeStream(
new WriterOutputStream(writer, "US-ASCII"));
IOUtils.copy(in, out);
out.flush();
}
}
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