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authorLaurent Bercot <ska-skaware@skarnet.org>2017-10-18 16:13:24 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2017-10-18 16:13:24 +0000
commit45923c08b00ccdfd888caf6d2b555a137c563988 (patch)
tree5dc167cf4b8e3ff372f59ca9fb6ba0940387c83c /src/libstddjb/uint32_bswap.c
parent62a04cdd0b6811c07bbafae37fe906a36fa800b1 (diff)
downloadskalibs-45923c08b00ccdfd888caf6d2b555a137c563988.tar.xz
Better packing / unpacking code
Godbolted for x86_64 with gcc and clang.
Diffstat (limited to 'src/libstddjb/uint32_bswap.c')
-rw-r--r--src/libstddjb/uint32_bswap.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/libstddjb/uint32_bswap.c b/src/libstddjb/uint32_bswap.c
new file mode 100644
index 0000000..b9dbcab
--- /dev/null
+++ b/src/libstddjb/uint32_bswap.c
@@ -0,0 +1,13 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <skalibs/uint32.h>
+
+uint32_t uint32_bswap (uint32_t a)
+{
+ return
+ (a & 0x000000ffu) << 24 |
+ (a & 0x0000ff00u) << 8 |
+ (a & 0x00ff0000u) >> 8 |
+ (a & 0xff000000u) >> 24 ;
+}