File 0001-libfreefare-resolve-compiler-warning-on-breakage-of-.patch of Package libfreefare

From 3dd547d851cca5906edc674e127ecaa2b49591b6 Mon Sep 17 00:00:00 2001
From: Jan Engelhardt <jengelh@inai.de>
Date: Wed, 5 Jun 2013 18:22:26 +0200
X-Upstream-Status: submitted, awaiting merge
Subject: [PATCH] libfreefare: resolve compiler warning on breakage of strict
 aliasing

gcc warns:
mifare_classic.c:353:45: warning: dereferencing type-punned pointer
will break strict-aliasing rules [-Wstrict-aliasing]

There is another problem with this code: "data", being a 16-byte
array, may not be suitably aligned for the other types in the union.
This patch resolves this.
---
 libfreefare/mifare_classic.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/libfreefare/mifare_classic.c b/libfreefare/mifare_classic.c
index aaf2d64..1502fe8 100644
--- a/libfreefare/mifare_classic.c
+++ b/libfreefare/mifare_classic.c
@@ -346,12 +346,10 @@ mifare_classic_init_value (MifareTag tag, const MifareClassicBlockNumber block,
 int
 mifare_classic_read_value (MifareTag tag, const MifareClassicBlockNumber block, int32_t *value, MifareClassicBlockNumber *adr)
 {
-    MifareClassicBlock data;
-    if (mifare_classic_read (tag, block, &data) < 0)
-	return -1;
-
-    union mifare_classic_block b = *((union mifare_classic_block *)(&data));
+    union mifare_classic_block b;
 
+    if (mifare_classic_read (tag, block, b.data) < 0)
+	return -1;
 
     if ((b.value.value ^ (uint32_t)~b.value.value_) || (b.value.value != b.value.value__)) {
 	errno = EIO;
-- 
1.8.2