1 files changed, 85 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/util/BitFlagHelper.java b/src/main/java/org/pdfbox/util/BitFlagHelper.java
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+++ b/src/main/java/org/pdfbox/util/BitFlagHelper.java
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+/**
+ * Copyright (c) 2005, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.util;
+
+import org.pdfbox.cos.COSDictionary;
+
+/**
+ * This class will be used for bit flag operations.
+ *
+ * @author Ben Litchfield (ben@benlitchfield.com)
+ * @version $Revision: 1.2 $
+ */
+public class BitFlagHelper
+{
+    private BitFlagHelper()
+    {
+        //helper class should not be constructed
+    }
+    
+    /**
+     * Sets the given boolean value at bitPos in the flags.
+     *
+     * @param dic The dictionary to set the value into.
+     * @param field The name of the field to set the value into.
+     * @param bitFlag the bit position to set the value in.
+     * @param value the value the bit position should have.
+     */
+    public static void setFlag( COSDictionary dic, String field, int bitFlag, boolean value )
+    {
+        int currentFlags = dic.getInt( field, 0 );
+        if( value )
+        {
+            currentFlags = currentFlags | bitFlag;
+        }
+        else
+        {
+            currentFlags = currentFlags &= ~bitFlag;
+        }
+        dic.setInt( field, currentFlags );
+    }
+    
+    /**
+     * Gets the boolean value from the flags at the given bit
+     * position.
+     * 
+     * @param dic The dictionary to get the field from.
+     * @param field The name of the field to get the flag from.
+     * @param bitFlag the bitPosition to get the value from.
+     * 
+     * @return true if the number at bitPos is '1'
+     */
+    public static boolean getFlag(COSDictionary dic, String field, int bitFlag)
+    {
+        int ff = dic.getInt( field, 0 );
+        return (ff & bitFlag) == bitFlag;
+    }
+}
+\ No newline at end of file