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authorNicolas Schodet2013-01-19 18:26:29 +0100
committerNicolas Schodet2013-01-19 18:26:29 +0100
commitf9fe769d5d1996866a9a87670a4fa7d9a0dd3cb3 (patch)
treeb362b167f3b60dfd7414af4c8cd142f15a31293e /digital/ucoolib
parentd3702da4a90890010e3a3b1dc2eb6d1eb3a3d1c9 (diff)
digital/ucoolib/ucoolib/utils: add bytes tools
Diffstat (limited to 'digital/ucoolib')
-rw-r--r--digital/ucoolib/ucoolib/utils/bytes.hh52
1 files changed, 52 insertions, 0 deletions
diff --git a/digital/ucoolib/ucoolib/utils/bytes.hh b/digital/ucoolib/ucoolib/utils/bytes.hh
new file mode 100644
index 00000000..05d5c0d6
--- /dev/null
+++ b/digital/ucoolib/ucoolib/utils/bytes.hh
@@ -0,0 +1,52 @@
+#ifndef ucoolib_ucoolib_utils_bytes_hh
+#define ucoolib_ucoolib_utils_bytes_hh
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+
+namespace ucoo {
+
+/// Pack two bytes to one 16 bit word.
+static inline uint16_t
+bytes_pack (uint8_t b1, uint8_t b0)
+{
+ return b1 << 8 | b0;
+}
+
+/// Pack four bytes to one 32 bit word.
+static inline uint32_t
+bytes_pack (uint8_t b3, uint8_t b2, uint8_t b1, uint8_t b0)
+{
+ return b3 << 24 | b2 << 16 | b1 << 8 | b0;
+}
+
+/// Unpack one byte from one 32 bit word.
+static inline uint8_t
+bytes_unpack (uint32_t w, int n)
+{
+ return (w >> (n * 8)) & 0xff;
+}
+
+} // namespace ucoo
+
+#endif // ucoolib_ucoolib_utils_bytes_hh