| /* |
| * Copyright 2013 ZXing authors |
| * |
| * 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. |
| */ |
| |
| package com.google.zxing.client.j2se; |
| |
| import javax.imageio.ImageIO; |
| import javax.xml.bind.DatatypeConverter; |
| import java.awt.image.BufferedImage; |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.net.URI; |
| import java.net.URLDecoder; |
| |
| /** |
| * Encapsulates reading URIs as images. |
| * |
| * @author Sean Owen |
| */ |
| public final class ImageReader { |
| |
| private static final String BASE64TOKEN = "base64,"; |
| |
| private ImageReader() { |
| } |
| |
| public static BufferedImage readImage(URI uri) throws IOException { |
| if ("data".equals(uri.getScheme())) { |
| return readDataURIImage(uri); |
| } |
| BufferedImage result; |
| try { |
| result = ImageIO.read(uri.toURL()); |
| } catch (IllegalArgumentException iae) { |
| throw new IOException("Resource not found: " + uri, iae); |
| } |
| if (result == null) { |
| throw new IOException("Could not load " + uri); |
| } |
| return result; |
| } |
| |
| public static BufferedImage readDataURIImage(URI uri) throws IOException { |
| String uriString = uri.getSchemeSpecificPart(); |
| if (!uriString.startsWith("image/")) { |
| throw new IOException("Unsupported data URI MIME type"); |
| } |
| int base64Start = uriString.indexOf(BASE64TOKEN); |
| if (base64Start < 0) { |
| throw new IOException("Unsupported data URI encoding"); |
| } |
| String base64DataEncoded = uriString.substring(base64Start + BASE64TOKEN.length()); |
| String base64Data = URLDecoder.decode(base64DataEncoded, "UTF-8"); |
| byte[] imageBytes = DatatypeConverter.parseBase64Binary(base64Data); |
| return ImageIO.read(new ByteArrayInputStream(imageBytes)); |
| } |
| |
| } |