19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * this work for additional information regarding copyright ownership. 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (the "License"); you may not use this file except in compliance with 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the License. You may obtain a copy of the License at 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage javax.imageio.stream; 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport org.apache.harmony.x.imageio.stream.RandomAccessMemoryCache; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The MemoryCacheImageInputStream class implements ImageInputStream using a 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * memory buffer for caching the data. 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @since Android 1.0 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class MemoryCacheImageInputStream extends ImageInputStreamImpl { 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The is. 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private InputStream is; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The ramc. 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private RandomAccessMemoryCache ramc = new RandomAccessMemoryCache(); 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Instantiates a new MemoryCacheImageInputStream which reads from the 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * specified InputStream. 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param stream 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the InputStream to be read. 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public MemoryCacheImageInputStream(InputStream stream) { 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (stream == null) { 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalArgumentException("stream == null!"); 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project is = stream; 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read() throws IOException { 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project bitOffset = 0; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (streamPos >= ramc.length()) { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = (int)(streamPos - ramc.length() + 1); 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bytesAppended = ramc.appendData(is, count); 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (bytesAppended < count) { 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int res = ramc.getData(streamPos); 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (res >= 0) { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project streamPos++; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return res; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] b, int off, int len) throws IOException { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project bitOffset = 0; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (streamPos >= ramc.length()) { 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = (int)(streamPos - ramc.length() + len); 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ramc.appendData(is, count); 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int res = ramc.getData(b, off, len, streamPos); 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (res > 0) { 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project streamPos += res; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return res; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isCached() { 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isCachedFile() { 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isCachedMemory() { 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void close() throws IOException { 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.close(); 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ramc.close(); 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void flushBefore(long pos) throws IOException { 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.flushBefore(pos); 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ramc.freeBefore(getFlushedPosition()); 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 120