Initial Contribution
diff --git a/awt/javax/imageio/stream/FileCacheImageOutputStream.java b/awt/javax/imageio/stream/FileCacheImageOutputStream.java
new file mode 100644
index 0000000..ae48585
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+++ b/awt/javax/imageio/stream/FileCacheImageOutputStream.java
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+/*
+ * 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 java.io.IOException;
+import java.io.File;
+import java.io.OutputStream;
+import java.io.RandomAccessFile;
+
+/**
+ * The FileCacheImageOutputStream class is an implementation of
+ * ImageOutputStream that writes to its OutputStream
+ * using a temporary file as a cache.
+ */
+public class FileCacheImageOutputStream extends ImageOutputStreamImpl {
+
+ /** The Constant IIO_TEMP_FILE_PREFIX. */
+ static final String IIO_TEMP_FILE_PREFIX = "iioCache";
+
+ /** The Constant MAX_BUFFER_LEN. */
+ static final int MAX_BUFFER_LEN = 1048575; // 1 MB - is it not too much?
+
+ /** The os. */
+ private OutputStream os;
+
+ /** The file. */
+ private File file;
+
+ /** The raf. */
+ private RandomAccessFile raf;
+
+ /**
+ * Instantiates a FileCacheImageOutputStream.
+ *
+ * @param stream the OutputStream for writing.
+ * @param cacheDir the cache directory where the chache file
+ * will be created.
+ *
+ * @throws IOException Signals that an I/O exception has occurred.
+ */
+ public FileCacheImageOutputStream(OutputStream stream, File cacheDir) throws IOException {
+ if (stream == null) {
+ throw new IllegalArgumentException("stream == null!");
+ }
+ os = stream;
+
+ if (cacheDir == null || cacheDir.isDirectory()) {
+ file = File.createTempFile(IIO_TEMP_FILE_PREFIX, null, cacheDir);
+ file.deleteOnExit();
+ } else {
+ throw new IllegalArgumentException("Not a directory!");
+ }
+
+ raf = new RandomAccessFile(file, "rw");
+ }
+
+ @Override
+ public void close() throws IOException {
+ flushBefore(raf.length());
+ super.close();
+ raf.close();
+ file.delete();
+ }
+
+ @Override
+ public boolean isCached() {
+ return true;
+ }
+
+ @Override
+ public boolean isCachedFile() {
+ return true;
+ }
+
+ @Override
+ public boolean isCachedMemory() {
+ return false;
+ }
+
+ @Override
+ public void write(int b) throws IOException {
+ flushBits(); // See the flushBits method description
+
+ raf.write(b);
+ streamPos++;
+ }
+
+ @Override
+ public void write(byte[] b, int off, int len) throws IOException {
+ flushBits(); // See the flushBits method description
+
+ raf.write(b, off, len);
+ streamPos += len;
+ }
+
+ @Override
+ public int read() throws IOException {
+ bitOffset = 0; // Should reset
+
+ int res = raf.read();
+ if (res >= 0) {
+ streamPos++;
+ }
+
+ return res;
+ }
+
+ @Override
+ public int read(byte[] b, int off, int len) throws IOException {
+ bitOffset = 0;
+
+ int numRead = raf.read(b, off, len);
+ if (numRead > 0) {
+ streamPos += numRead;
+ }
+
+ return numRead;
+ }
+
+ @Override
+ public void flushBefore(long pos) throws IOException {
+ long readFromPos = flushedPos;
+ super.flushBefore(pos);
+
+ long bytesToRead = pos - readFromPos;
+ raf.seek(readFromPos);
+
+ if (bytesToRead < MAX_BUFFER_LEN) {
+ byte buffer[] = new byte[(int)bytesToRead];
+ raf.readFully(buffer);
+ os.write(buffer);
+ } else {
+ byte buffer[] = new byte[MAX_BUFFER_LEN];
+ while (bytesToRead > 0) {
+ int count = (int) Math.min(MAX_BUFFER_LEN, bytesToRead);
+ raf.readFully(buffer, 0, count);
+ os.write(buffer, 0, count);
+ bytesToRead -= count;
+ }
+ }
+
+ os.flush();
+
+ if (pos != streamPos) {
+ raf.seek(streamPos); // Reset the position
+ }
+ }
+
+ @Override
+ public void seek(long pos) throws IOException {
+ if (pos < flushedPos) {
+ throw new IndexOutOfBoundsException();
+ }
+
+ raf.seek(pos);
+ streamPos = raf.getFilePointer();
+ bitOffset = 0;
+ }
+
+ @Override
+ public long length() {
+ try {
+ return raf.length();
+ } catch(IOException e) {
+ return -1L;
+ }
+ }
+}