1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.browser; 17 18 import java.net.MalformedURLException; 19 20 import libcore.io.Base64; 21 22 /** 23 * Class extracts the mime type and data from a data uri. 24 * A data URI is of the form: 25 * <pre> 26 * data:[<MIME-type>][;charset=<encoding>][;base64],<data> 27 * </pre> 28 */ 29 public class DataUri { 30 private static final String DATA_URI_PREFIX = "data:"; 31 private static final String BASE_64_ENCODING = ";base64"; 32 33 private String mMimeType; 34 private byte[] mData; 35 DataUri(String uri)36 public DataUri(String uri) throws MalformedURLException { 37 if (!isDataUri(uri)) { 38 throw new MalformedURLException("Not a data URI"); 39 } 40 41 int commaIndex = uri.indexOf(',', DATA_URI_PREFIX.length()); 42 if (commaIndex < 0) { 43 throw new MalformedURLException("Comma expected in data URI"); 44 } 45 String contentType = uri.substring(DATA_URI_PREFIX.length(), 46 commaIndex); 47 mData = uri.substring(commaIndex + 1).getBytes(); 48 if (contentType.contains(BASE_64_ENCODING)) { 49 mData = Base64.decode(mData); 50 } 51 int semiIndex = contentType.indexOf(';'); 52 if (semiIndex > 0) { 53 mMimeType = contentType.substring(0, semiIndex); 54 } else { 55 mMimeType = contentType; 56 } 57 } 58 59 /** 60 * Returns true if the text passed in appears to be a data URI. 61 */ isDataUri(String text)62 public static boolean isDataUri(String text) 63 { 64 return text.startsWith(DATA_URI_PREFIX); 65 } 66 getMimeType()67 public String getMimeType() { 68 return mMimeType; 69 } 70 getData()71 public byte[] getData() { 72 return mData; 73 } 74 } 75