From 2e9f2e7c2b98d7249a0919626f3e4158465a9758 Mon Sep 17 00:00:00 2001
From: Chris Jaekl <chris@ringo.jaekl.net>
Date: Sun, 6 Sep 2015 15:24:24 +0900
Subject: [PATCH] Add missing file that should have been in previous commit.

---
 .../net/jaekl/qd/util/InputStreamWrapper.java | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 prod/net/jaekl/qd/util/InputStreamWrapper.java

diff --git a/prod/net/jaekl/qd/util/InputStreamWrapper.java b/prod/net/jaekl/qd/util/InputStreamWrapper.java
new file mode 100644
index 0000000..f78cf61
--- /dev/null
+++ b/prod/net/jaekl/qd/util/InputStreamWrapper.java
@@ -0,0 +1,47 @@
+// Copyright (C) 2014 Christian Jaekl
+
+// Wrap an inputstream, keeping a copy of the first few bytes that are read from it.
+// This is useful when passing an inputstream directly to the SAX parser, 
+// because we may want to do a post-mortem examination of the input being parsed
+// if parsing fails.
+
+package net.jaekl.qd.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+
+public class InputStreamWrapper extends InputStream {
+	final static int HEAD_MAX = 1024;
+	
+	InputStream m_is;	// the stream being wrapped
+	byte[] m_head;		// the first (up to HEAD_MAX) bytes that were read from the wrapped stream
+	int    m_headBytes;	// number of bytes stored in m_head
+	
+	public InputStreamWrapper(InputStream is)
+	{
+		super();
+		
+		m_is = is;
+		m_head = new byte[HEAD_MAX];
+		m_headBytes = 0;
+	}
+	
+	@Override
+	public int read() throws IOException {
+		int b = m_is.read();
+		if ((-1) == b) {
+			// end-of-stream
+			return b;
+		}
+		if (m_headBytes < HEAD_MAX) {
+			m_head[m_headBytes] = (byte)b;
+			m_headBytes++;
+		}
+		return b;
+	}
+	
+	public byte[] getHeadBytes() {
+		return Arrays.copyOf(m_head, m_headBytes);
+	}
+}
-- 
2.39.2