1 files changed, 131 insertions, 0 deletions
diff --git a/awt/javax/imageio/stream/FileCacheImageInputStream.java b/awt/javax/imageio/stream/FileCacheImageInputStream.java
new file mode 100644
index 0000000..47bc189
--- /dev/null
+++ b/awt/javax/imageio/stream/FileCacheImageInputStream.java
@@ -0,0 +1,131 @@
+/*
+ *  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.*;
+
+/**
+ * The FileCacheImageInputStream class is an implementation of
+ * ImageInputStream which reads from its InputStream
+ * and uses a temporary file as a cache. 
+ */
+public class FileCacheImageInputStream extends ImageInputStreamImpl {
+    
+    /** The is. */
+    private InputStream is;
+    
+    /** The file. */
+    private File file;
+    
+    /** The raf. */
+    private RandomAccessFile raf;
+
+
+    /**
+     * Instantiates a new FileCacheImageInputStream from
+     * the specified InputStream and using the specified 
+     * File as its cache directory.
+     * 
+     * @param stream the InputStream for reading.
+     * @param cacheDir the cache directory where the chache file
+     * will be created.
+     * 
+     * @throws IOException Signals that an I/O exception has occurred.
+     */
+    public FileCacheImageInputStream(InputStream stream, File cacheDir) throws IOException {
+        if (stream == null) {
+            throw new IllegalArgumentException("stream == null!");
+        }
+        is = stream;
+
+        if (cacheDir == null || cacheDir.isDirectory()) {
+            file = File.createTempFile(FileCacheImageOutputStream.IIO_TEMP_FILE_PREFIX, null, cacheDir);
+            file.deleteOnExit();
+        } else {
+            throw new IllegalArgumentException("Not a directory!");
+        }
+
+        raf = new RandomAccessFile(file, "rw");
+    }
+
+    @Override
+    public int read() throws IOException {
+        bitOffset = 0;
+
+        if (streamPos >= raf.length()) {
+            int b = is.read();
+
+            if (b < 0) {
+                return -1;
+            }
+
+            raf.seek(streamPos++);
+            raf.write(b);
+            return b;
+        }
+
+        raf.seek(streamPos++);
+        return raf.read();
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException {
+        bitOffset = 0;
+
+        if (streamPos >= raf.length()) {
+            int nBytes = is.read(b, off, len);
+
+            if (nBytes < 0) {
+                return -1;
+            }
+
+            raf.seek(streamPos);
+            raf.write(b, off, nBytes);
+            streamPos += nBytes;
+            return nBytes;
+        }
+
+        raf.seek(streamPos);
+        int nBytes = raf.read(b, off, len);
+        streamPos += nBytes;
+        return nBytes;
+    }
+
+    @Override
+    public boolean isCached() {
+        return true;
+    }
+
+    @Override
+    public boolean isCachedFile() {
+        return true;
+    }
+
+    @Override
+    public boolean isCachedMemory() {
+        return false;
+    }
+
+    @Override
+    public void close() throws IOException {
+        super.close();
+        raf.close();
+        file.delete();
+    }
+}