1 files changed, 60 insertions, 0 deletions
diff --git a/src/libac3/bswap.h b/src/libac3/bswap.h
new file mode 100644
index 000000000..0fc325d64
--- /dev/null
+++ b/src/libac3/bswap.h
@@ -0,0 +1,60 @@
+#ifndef __BSWAP_H__
+#define __BSWAP_H__
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_BYTESWAP_H
+#include <byteswap.h>
+#else
+
+#include <inttypes.h>
+
+#ifdef WORDS_BIGENDIAN
+// FIXME these need to actually swap ;)
+#define bswap_16(x) (x)
+#define bswap_32(x) (x)
+#define bswap_64(x) (x)
+#else
+// This is wrong, 'cannot take address of ...'
+#define bswap_16(x) ((((uint8_t*)&x)[2] << 8) \
+			| (((uint8_t*)&x)[3]))
+
+// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
+#define bswap_32(x) \
+     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
+      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
+
+#define bswap_64(x) \
+     (__extension__						\
+      ({ union { __extension__ uint64_t __ll;                   \
+                 uint32_t __l[2]; } __w, __r;                   \
+         __w.__ll = (x);					\
+         __r.__l[0] = bswap_32 (__w.__l[1]);			\
+         __r.__l[1] = bswap_32 (__w.__l[0]);			\
+         __r.__ll; }))
+#endif
+
+#endif
+
+// be2me ... BigEndian to MachineEndian
+// le2me ... LittleEndian to MachineEndian
+
+#ifdef WORDS_BIGENDIAN
+#define be2me_16(x) (x)
+#define be2me_32(x) (x)
+#define be2me_64(x) (x)
+#define le2me_16(x) bswap_16(x)
+#define le2me_32(x) bswap_32(x)
+#define le2me_64(x) bswap_64(x)
+#else
+#define be2me_16(x) bswap_16(x)
+#define be2me_32(x) bswap_32(x)
+#define be2me_64(x) bswap_64(x)
+#define le2me_16(x) (x)
+#define le2me_32(x) (x)
+#define le2me_64(x) (x)
+#endif
+
+#endif