1 files changed, 184 insertions, 0 deletions
diff --git a/awt/javax/imageio/stream/FileCacheImageOutputStream.java b/awt/javax/imageio/stream/FileCacheImageOutputStream.java
new file mode 100644
index 0000000..ae48585
--- /dev/null
+++ b/awt/javax/imageio/stream/FileCacheImageOutputStream.java
@@ -0,0 +1,184 @@
+/*
+ *  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;
+        }
+    }
+}