partutil: make the get endian functions alignment aware

On architectures where unaligned access is not supported, it might have
to be fixed at runtime which can cause slow downs or make the code abort
(like generating SIGBUS).

1 files changed, 16 insertions, 4 deletions

diff --git a/partutil/partutil.c b/partutil/partutil.c
index 35fc82d7..c623ca2e 100644
--- a/partutil/partutil.c
+++ b/partutil/partutil.c
@@ -146,27 +146,39 @@ part_table_find (PartitionTable *p, guint64 offset,
 static guint16
 get_le16 (const void *buf)
 {
-	return GUINT16_FROM_LE ( * ((guint16 *) buf) );
+	guint16 i;
+
+	memcpy (&i, buf, sizeof (i));
+	return GUINT16_FROM_LE (i);
 }
 
 
 static guint32
 get_le32 (const void *buf)
 {
-	return GUINT32_FROM_LE ( * ((guint32 *) buf) );
+	guint32 i;
+
+	memcpy (&i, buf, sizeof (i));
+	return GUINT32_FROM_LE (i);
 }
 
 static guint64
 get_le64 (const void *buf)
 {
-	return GUINT64_FROM_LE ( * ((guint64 *) buf) );
+	guint64 i;
+
+	memcpy (&i, buf, sizeof (i));
+	return GUINT64_FROM_LE (i);
 }
 
 
 static guint32
 get_be32 (const void *buf)
 {
-	return GUINT32_FROM_BE ( * ((guint32 *) buf) );
+	guint32 i;
+
+	memcpy (&i, buf, sizeof (i));
+	return GUINT32_FROM_BE (i);
 }
 
 /* see http://en.wikipedia.org/wiki/Globally_Unique_Identifier - excerpt