Initial Contribution

1 files changed, 113 insertions, 0 deletions

diff --git a/awt/javax/imageio/stream/MemoryCacheImageInputStream.java b/awt/javax/imageio/stream/MemoryCacheImageInputStream.java
new file mode 100644
index 000000000000..a3d470b01cd3
--- /dev/null
+++ b/awt/javax/imageio/stream/MemoryCacheImageInputStream.java
@@ -0,0 +1,113 @@
+/*
+ *  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.IOException;
+import java.io.InputStream;
+
+/**
+ * The MemoryCacheImageInputStream class implements ImageInputStream
+ * using a memory buffer for caching the data.
+ */
+public class MemoryCacheImageInputStream  extends ImageInputStreamImpl {
+    
+    /** The is. */
+    private InputStream is;
+    
+    /** The ramc. */
+    private RandomAccessMemoryCache ramc = new RandomAccessMemoryCache();
+
+    /**
+     * Instantiates a new MemoryCacheImageInputStream
+     * which reads from the specified InputStream.
+     * 
+     * @param stream the InputStream to be read.
+     */
+    public MemoryCacheImageInputStream(InputStream stream) {
+        if (stream == null) {
+            throw new IllegalArgumentException("stream == null!");
+        }
+        is = stream;
+    }
+
+    @Override
+    public int read() throws IOException {
+        bitOffset = 0;
+
+        if (streamPos >= ramc.length()) {
+            int count = (int)(streamPos - ramc.length() + 1);
+            int bytesAppended = ramc.appendData(is, count);
+
+            if (bytesAppended < count) {
+                return -1;
+            }
+        }
+
+        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;
+
+        if (streamPos >= ramc.length()) {
+            int count = (int)(streamPos - ramc.length() + len);
+            ramc.appendData(is, count);
+        }
+
+        int res = ramc.getData(b, off, len, streamPos);
+        if (res > 0) {
+            streamPos += res;
+        }
+        return res;
+    }
+
+    @Override
+    public boolean isCached() {
+        return true;
+    }
+
+    @Override
+    public boolean isCachedFile() {
+        return false;
+    }
+
+    @Override
+    public boolean isCachedMemory() {
+        return true;
+    }
+
+    @Override
+    public void close() throws IOException {
+        super.close();
+        ramc.close();
+    }
+
+    @Override
+    public void flushBefore(long pos) throws IOException {
+        super.flushBefore(pos);
+        ramc.freeBefore(getFlushedPosition());
+    }
+}