From 55fd02f83ecd6cbd6925a3e8a3d43b8d4ef2a17c Mon Sep 17 00:00:00 2001
From: Lasse Collin <lasse.collin@tukaani.org>
Date: Thu, 3 Nov 2011 17:07:22 +0200
Subject: [PATCH] xz: Fix xz on EBCDIC systems.

Thanks to Chris Donawa.
---
 src/xz/coder.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/xz/coder.c b/src/xz/coder.c
index b123ec5b..69b1225d 100644
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -284,7 +284,10 @@ coder_set_compression_settings(void)
 static bool
 is_format_xz(void)
 {
-	return strm.avail_in >= 6 && memcmp(in_buf.u8, "\3757zXZ", 6) == 0;
+	// Specify the magic as hex to be compatible with EBCDIC systems.
+	static const uint8_t magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
+	return strm.avail_in >= sizeof(magic)
+			&& memcmp(in_buf.u8, magic, sizeof(magic)) == 0;
 }