136 lines
3.4 KiB
Java
136 lines
3.4 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.imageio.stream;
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import org.apache.harmony.x.imageio.stream.RandomAccessMemoryCache;
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import java.io.OutputStream;
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import java.io.IOException;
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/**
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* The MemoryCacheImageOutputStream class implements ImageOutputStream using a
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* memory buffer for caching the data.
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*
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* @since Android 1.0
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*/
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public class MemoryCacheImageOutputStream extends ImageOutputStreamImpl {
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/**
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* The os.
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*/
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OutputStream os;
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/**
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* The ramc.
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*/
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RandomAccessMemoryCache ramc = new RandomAccessMemoryCache();
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/**
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* Instantiates a new MemoryCacheImageOutputStream which writes to the
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* specified OutputStream.
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*
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* @param stream
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* the OutputStream.
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*/
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public MemoryCacheImageOutputStream(OutputStream stream) {
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if (stream == null) {
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throw new IllegalArgumentException("stream == null!");
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}
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os = stream;
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}
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@Override
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public void write(int b) throws IOException {
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flushBits(); // See the flushBits method description
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ramc.putData(b, streamPos);
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streamPos++;
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}
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@Override
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public void write(byte[] b, int off, int len) throws IOException {
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flushBits(); // See the flushBits method description
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ramc.putData(b, off, len, streamPos);
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streamPos += len;
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}
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@Override
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public int read() throws IOException {
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bitOffset = 0;
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int res = ramc.getData(streamPos);
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if (res >= 0) {
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streamPos++;
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}
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return res;
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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bitOffset = 0;
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int res = ramc.getData(b, off, len, streamPos);
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if (res > 0) {
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streamPos += res;
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}
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return res;
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}
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@Override
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public long length() {
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return ramc.length();
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}
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@Override
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public boolean isCached() {
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return true;
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}
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@Override
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public boolean isCachedMemory() {
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return true;
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}
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@Override
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public boolean isCachedFile() {
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return false;
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}
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@Override
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public void close() throws IOException {
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flushBefore(length());
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super.close();
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ramc.close();
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}
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@Override
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public void flushBefore(long pos) throws IOException {
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long flushedPosition = getFlushedPosition();
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super.flushBefore(pos);
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long newFlushedPosition = getFlushedPosition();
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int nBytes = (int)(newFlushedPosition - flushedPosition);
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ramc.getData(os, nBytes, flushedPosition);
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ramc.freeBefore(newFlushedPosition);
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os.flush();
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}
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}
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