1 files changed, 130 insertions, 0 deletions
diff --git a/isoparser/src/main/java/com/coremedia/iso/.svn/text-base/AbstractBoxParser.java.svn-base b/isoparser/src/main/java/com/coremedia/iso/.svn/text-base/AbstractBoxParser.java.svn-base
new file mode 100644
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--- /dev/null
+++ b/isoparser/src/main/java/com/coremedia/iso/.svn/text-base/AbstractBoxParser.java.svn-base
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2012 Sebastian Annies, Hamburg
+ *
+ * Licensed 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 com.coremedia.iso;
+
+import com.coremedia.iso.boxes.Box;
+import com.coremedia.iso.boxes.ContainerBox;
+import com.coremedia.iso.boxes.UserBox;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.ReadableByteChannel;
+import java.util.logging.Logger;
+
+import static com.googlecode.mp4parser.util.CastUtils.l2i;
+
+/**
+ * This BoxParser handles the basic stuff like reading size and extracting box type.
+ */
+public abstract class AbstractBoxParser implements BoxParser {
+
+    private static Logger LOG = Logger.getLogger(AbstractBoxParser.class.getName());
+
+    public abstract Box createBox(String type, byte[] userType, String parent);
+
+    /**
+     * Parses the next size and type, creates a box instance and parses the box's content.
+     *
+     * @param byteChannel the FileChannel pointing to the ISO file
+     * @param parent      the current box's parent (null if no parent)
+     * @return the box just parsed
+     * @throws java.io.IOException if reading from <code>in</code> fails
+     */
+    public Box parseBox(ReadableByteChannel byteChannel, ContainerBox parent) throws IOException {
+
+
+        ByteBuffer header = ChannelHelper.readFully(byteChannel, 8);
+
+        long size = IsoTypeReader.readUInt32(header);
+        // do plausibility check
+        if (size < 8 && size > 1) {
+            LOG.severe("Plausibility check failed: size < 8 (size = " + size + "). Stop parsing!");
+            return null;
+        }
+
+
+        String type = IsoTypeReader.read4cc(header);
+        byte[] usertype = null;
+        long contentSize;
+
+        if (size == 1) {
+            ByteBuffer bb = ByteBuffer.allocate(8);
+            byteChannel.read(bb);
+            bb.rewind();
+            size = IsoTypeReader.readUInt64(bb);
+            contentSize = size - 16;
+        } else if (size == 0) {
+            if (byteChannel instanceof FileChannel) {
+                size = ((FileChannel) byteChannel).size() - ((FileChannel) byteChannel).position() - 8;
+            } else {
+                throw new RuntimeException("Only FileChannel inputs may use size == 0 (box reaches to the end of file)");
+            }
+            contentSize = size - 8;
+        } else {
+            contentSize = size - 8;
+        }
+        if (UserBox.TYPE.equals(type)) {
+            ByteBuffer bb = ByteBuffer.allocate(16);
+            byteChannel.read(bb);
+            bb.rewind();
+            usertype = bb.array();
+            contentSize -= 16;
+        }
+        Box box = createBox(type, usertype, parent.getType());
+        box.setParent(parent);
+        LOG.finest("Parsing " + box.getType());
+        // System.out.println("parsing " + Arrays.toString(box.getType()) + " " + box.getClass().getName() + " size=" + size);
+
+
+        if (l2i(size - contentSize) == 8) {
+            // default - no large box - no uuid
+            // do nothing header's already correct
+            header.rewind();
+        } else if (l2i(size - contentSize) == 16) {
+            header = ByteBuffer.allocate(16);
+            IsoTypeWriter.writeUInt32(header, 1);
+            header.put(IsoFile.fourCCtoBytes(type));
+            IsoTypeWriter.writeUInt64(header, size);
+        } else if (l2i(size - contentSize) == 24) {
+            header = ByteBuffer.allocate(24);
+            IsoTypeWriter.writeUInt32(header, size);
+            header.put(IsoFile.fourCCtoBytes(type));
+            header.put(usertype);
+        } else if (l2i(size - contentSize) == 32) {
+            header = ByteBuffer.allocate(32);
+            IsoTypeWriter.writeUInt32(header, size);
+            header.put(IsoFile.fourCCtoBytes(type));
+            IsoTypeWriter.writeUInt64(header, size);
+            header.put(usertype);
+        } else {
+            throw new RuntimeException("I didn't expect that");
+        }
+
+
+        box.parse(byteChannel, header, contentSize, this);
+        // System.out.println("box = " + box);
+
+
+        assert size == box.getSize() :
+                "Reconstructed Size is not x to the number of parsed bytes! (" +
+                        box.getType() + ")"
+                        + " Actual Box size: " + size + " Calculated size: " + box.getSize();
+        return box;
+    }
+
+
+}