bytes.h: byte-order utilities.

util/bytes.h

@@ -0,0 +1,82 @@
+/* MSPDebug - debugging tool for MSP430 MCUs
+ * Copyright (C) 2009-2013 Daniel Beer
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef BYTES_H_
+#define BYTES_H_
+
+#include <stdint.h>
+
+/* Read/write big-endian 16-bit */
+static inline uint16_t r16be(const uint8_t *buf)
+{
+	return (((uint16_t)buf[0]) << 8) | ((uint16_t)buf[1]);
+}
+
+static inline void w16be(uint8_t *buf, uint16_t v)
+{
+	buf[0] = v >> 8;
+	buf[1] = v;
+}
+
+/* Read/write little-endian 16-bit */
+static inline uint16_t r16le(const uint8_t *buf)
+{
+	return (((uint16_t)buf[1]) << 8) | ((uint16_t)buf[0]);
+}
+
+static inline void w16le(uint8_t *buf, uint16_t v)
+{
+	buf[1] = v >> 8;
+	buf[0] = v;
+}
+
+/* Read/write big-endian 32-bit */
+static inline uint32_t r32be(const uint8_t *buf)
+{
+	return (((uint32_t)buf[0]) << 24) |
+	       (((uint32_t)buf[1]) << 16) |
+	       (((uint32_t)buf[2]) << 8) |
+	       ((uint32_t)buf[3]);
+}
+
+static inline void w32be(uint8_t *buf, uint32_t v)
+{
+	buf[0] = v >> 24;
+	buf[1] = v >> 16;
+	buf[2] = v >> 8;
+	buf[3] = v;
+}
+
+/* Read/write little-endian 32-bit */
+static inline uint32_t r32le(const uint8_t *buf)
+{
+	return (((uint32_t)buf[3]) << 24) |
+	       (((uint32_t)buf[2]) << 16) |
+	       (((uint32_t)buf[1]) << 8) |
+	       ((uint32_t)buf[0]);
+}
+
+static inline void w32le(uint8_t *buf, uint32_t v)
+{
+	buf[3] = v >> 24;
+	buf[2] = v >> 16;
+	buf[1] = v >> 8;
+	buf[0] = v;
+}
+
+#endif