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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.ByteArrayInputStream;
-
- import javax.xml.transform.Source;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.URIResolver;
- import javax.xml.transform.stream.StreamSource;
-
- // base64 support for "data" urls
- import org.apache.xmlgraphics.util.io.Base64DecodeStream;
-
- /**
- * Resolves data URLs (described in RFC 2397) returning its data as a StreamSource.
- *
- * @see javax.xml.transform.URIResolver
- * @see <a href="http://www.ietf.org/rfc/rfc2397">RFC 2397</a>
- */
- public class DataURIResolver implements URIResolver {
-
- /**
- * @inheritDoc javax.xml.transform.URIResolver#resolve(java.lang.String, java.lang.String)
- */
- public Source resolve(String href, String base) throws TransformerException {
- if (href.startsWith("data:")) {
- return parseDataURI(href);
- } else {
- return null;
- }
- }
-
- /**
- * Parses inline data URIs as generated by MS Word's XML export and FO
- * stylesheet.
- *
- * @inheritDoc <a href="http://www.ietf.org/rfc/rfc2397">RFC 2397</a>
- */
- private Source parseDataURI(String href) {
- int commaPos = href.indexOf(',');
- // header is of the form data:[<mediatype>][;base64]
- String header = href.substring(0, commaPos);
- String data = href.substring(commaPos + 1);
- if (header.endsWith(";base64")) {
- byte[] bytes = data.getBytes();
- ByteArrayInputStream encodedStream = new ByteArrayInputStream(bytes);
- Base64DecodeStream decodedStream = new Base64DecodeStream(
- encodedStream);
- return new StreamSource(decodedStream);
- } else {
- // Note that this is not quite the full story here. But since we are
- // only interested
- // in base64-encoded binary data, the next line will probably never
- // be called.
- //TODO Handle un-escaping of special URL chars like %20
- return new StreamSource(new java.io.StringReader(data));
- }
- }
-
- }
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