1 files changed, 92 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/io/PushBackInputStream.java b/src/main/java/org/pdfbox/io/PushBackInputStream.java
new file mode 100644
index 0000000..d519900
--- /dev/null
+++ b/src/main/java/org/pdfbox/io/PushBackInputStream.java
@@ -0,0 +1,92 @@
+/**
+ * Copyright (c) 2003, 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.io;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * A simple subclass that adds a few convience methods.
+ *
+ * @author Ben Litchfield (ben@csh.rit.edu)
+ * @version $Revision: 1.4 $
+ */
+public class PushBackInputStream extends java.io.PushbackInputStream
+{
+
+    /**
+     * Constructor.
+     *
+     * @param input The input stream.
+     * @param size The size of the push back buffer.
+     * 
+     * @throws IOException If there is an error with the stream. 
+     */
+    public PushBackInputStream( InputStream input, int size ) throws IOException
+    {
+        super( input, size );
+        if( input == null )
+        {
+            throw new IOException( "Error: input was null" );
+        }
+    }
+
+    /**
+     * This will peek at the next byte.
+     *
+     * @return The next byte on the stream, leaving it as available to read.
+     *
+     * @throws IOException If there is an error reading the next byte.
+     */
+    public int peek() throws IOException
+    {
+        int result = read();
+        if( result != -1 )
+        {
+            unread( result );
+        }
+        return result;
+    }
+
+    /**
+     * A simple test to see if we are at the end of the stream.
+     *
+     * @return true if we are at the end of the stream.
+     *
+     * @throws IOException If there is an error reading the next byte.
+     */
+    public boolean isEOF() throws IOException
+    {
+        int peek = peek();
+        return peek == -1;
+    }
+    
+}
+\ No newline at end of file