From 2d5a068b88f814ff9747e53cb539a4a39cdf51f2 Mon Sep 17 00:00:00 2001
From: Andreas Fankhauser hiddenalpha.ch
Date: Thu, 29 Dec 2022 23:09:25 +0100
Subject: Add EmptyGzipInputStream

---
 .../xtra4j/octetstream/EmptyGzipInputStream.java   | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/EmptyGzipInputStream.java

diff --git a/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/EmptyGzipInputStream.java b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/EmptyGzipInputStream.java
new file mode 100644
index 0000000..28b5601
--- /dev/null
+++ b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/EmptyGzipInputStream.java
@@ -0,0 +1,25 @@
+package ch.hiddenalpha.xtra4j.octetstream;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+
+
+/**
+ * Same idea as {@link InputStream#nullInputStream()} but serving an empty gzip
+ * instead.
+ */
+public class EmptyGzipInputStream extends ByteArrayInputStream {
+
+    private static final byte[] EMPTY_GZIP = {
+            0x1F, (byte) 0x8B, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // gzip header
+            0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // empty deflate stream
+    };
+
+    /** Count of bytes this stream will serve */
+    public static final int length = EMPTY_GZIP.length;
+
+    public EmptyGzipInputStream() {
+        super(EMPTY_GZIP);
+    }
+
+}
-- 
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