| /* |
| * 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. |
| */ |
| |
| |
| package javax.imageio.stream; |
| |
| import org.apache.harmony.x.imageio.stream.RandomAccessMemoryCache; |
| |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| |
| /** |
| * The MemoryCacheImageOutputStream class implements ImageOutputStream |
| * using a memory buffer for caching the data. |
| */ |
| public class MemoryCacheImageOutputStream extends ImageOutputStreamImpl { |
| |
| /** The os. */ |
| OutputStream os; |
| |
| /** The ramc. */ |
| RandomAccessMemoryCache ramc = new RandomAccessMemoryCache(); |
| |
| /** |
| * Instantiates a new MemoryCacheImageOutputStream |
| * which writes to the specified OutputStream. |
| * |
| * @param stream the OutputStream. |
| */ |
| public MemoryCacheImageOutputStream(OutputStream stream) { |
| if (stream == null) { |
| throw new IllegalArgumentException("stream == null!"); |
| } |
| os = stream; |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| flushBits(); // See the flushBits method description |
| |
| ramc.putData(b, streamPos); |
| streamPos++; |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| flushBits(); // See the flushBits method description |
| |
| ramc.putData(b, off, len, streamPos); |
| streamPos += len; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| bitOffset = 0; |
| |
| int res = ramc.getData(streamPos); |
| if (res >= 0) { |
| streamPos++; |
| } |
| return res; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| bitOffset = 0; |
| |
| int res = ramc.getData(b, off, len, streamPos); |
| if (res > 0) { |
| streamPos += res; |
| } |
| return res; |
| } |
| |
| @Override |
| public long length() { |
| return ramc.length(); |
| } |
| |
| @Override |
| public boolean isCached() { |
| return true; |
| } |
| |
| @Override |
| public boolean isCachedMemory() { |
| return true; |
| } |
| |
| @Override |
| public boolean isCachedFile() { |
| return false; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| flushBefore(length()); |
| super.close(); |
| ramc.close(); |
| } |
| |
| @Override |
| public void flushBefore(long pos) throws IOException { |
| long flushedPosition = getFlushedPosition(); |
| super.flushBefore(pos); |
| |
| long newFlushedPosition = getFlushedPosition(); |
| int nBytes = (int)(newFlushedPosition - flushedPosition); |
| |
| ramc.getData(os, nBytes, flushedPosition); |
| ramc.freeBefore(newFlushedPosition); |
| |
| os.flush(); |
| } |
| } |