Merged DEV/SWIFT to HEAD

25458: added OpenCMIS server
   25555: Don't initialize servlet context if it is not present


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@28000 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/opencmis/RangeInputStream.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.opencmis;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class RangeInputStream extends InputStream
+{
+
+    private InputStream inputStream;
+    private long bytesRead;
+    private long length;
+
+    public RangeInputStream(InputStream inputStream, long offset, long length) throws IOException
+    {
+        super();
+
+        this.inputStream = inputStream;
+        this.length = length;
+        this.bytesRead = 0;
+
+        long l = this.inputStream.skip(offset);
+        if (l < offset)
+        {
+            this.inputStream.skip(offset);
+        }
+    }
+
+    @Override
+    public int read() throws IOException
+    {
+        if (bytesRead < length)
+        {
+            bytesRead++;
+            return inputStream.read();
+        } else
+        {
+            return -1;
+        }
+    }
+
+    @Override
+    public int read(byte[] b) throws IOException
+    {
+        return read(b, 0, b.length);
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException
+    {
+        if (len > length - bytesRead)
+        {
+            len = (int) (length - bytesRead);
+        }
+        int readed = inputStream.read(b, off, len);
+        bytesRead += readed;
+        return readed;
+    }
+
+    @Override
+    public int available() throws IOException
+    {
+        return (int) (length - bytesRead + 1);
+    }
+
+    @Override
+    public void close() throws IOException
+    {
+        inputStream.close();
+    }
+
+    @Override
+    public long skip(long n) throws IOException
+    {
+        if (bytesRead + n > length)
+        {
+            n = (length - n) > 0 ? (length - n) : length - bytesRead;
+        }
+        n = inputStream.skip(n);
+        bytesRead += n;
+
+        return n;
+    }
+
+}