-/*!
+/**
* \file
* <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
- * This file is part of DevLib - See devlib/README for information.
+ *
* -->
*
* \brief Functions to convert integers to/from host byte-order.
* \author Stefano Fedrigo <aleph@develer.com>
*/
-/*
- * $Log$
- * Revision 1.1 2004/07/20 16:26:15 bernie
- * Import byte-order macros into DevLib.
- *
- */
-
#ifndef MWARE_BYTEORDER_H
#define MWARE_BYTEORDER_H
-#include <compiler.h>
-#include <cpu.h>
+#include <cfg/compiler.h>
+#include <cpu/attr.h>
+
+/**
+ * Swap upper and lower bytes in a 16-bit value.
+ */
+INLINE uint16_t swab16(uint16_t x)
+{
+ return ((x & (uint16_t)0x00FFU) << 8)
+ | ((x & (uint16_t)0xFF00U) >> 8);
+}
+
+/**
+ * Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
+ */
+INLINE uint32_t swab32(uint32_t x)
+{
+ return ((x & (uint32_t)0x000000FFUL) << 24)
+ | ((x & (uint32_t)0x0000FF00UL) << 8)
+ | ((x & (uint32_t)0x00FF0000UL) >> 8)
+ | ((x & (uint32_t)0xFF000000UL) >> 24);
+}
+
+/**
+ * Reverse bytes in a 64-bit value.
+ */
+INLINE uint64_t swab64(uint64_t x)
+{
+ return (uint64_t)swab32(x >> 32)
+ | ((uint64_t)swab32(x & 0xFFFFFFFFUL) << 32);
+}
+
+/**
+ * Reverse bytes in a float value.
+ */
+INLINE float swab_float(float x)
+{
+ /* Avoid breaking strict aliasing rules. */
+ char *cx = (char *)(&x);
+ STATIC_ASSERT(sizeof(float) == 4);
+ #define BYTEORDER_SWAP(a, b) ((a) ^= (b) ^= (a) ^= (b))
+ BYTEORDER_SWAP(cx[0], cx[3]);
+ BYTEORDER_SWAP(cx[1], cx[2]);
+ #undef BYTEORDER_SWAP
+ return x;
+}
+
+INLINE uint16_t cpu_to_be16(uint16_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab16(x) : x;
+}
+
+INLINE uint16_t cpu_to_le16(uint16_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab16(x) : x;
+}
+
+INLINE uint32_t cpu_to_be32(uint32_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab32(x) : x;
+}
+
+INLINE uint32_t cpu_to_le32(uint32_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab32(x) : x;
+}
+
+INLINE uint64_t cpu_to_be64(uint64_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab64(x) : x;
+}
+
+INLINE uint64_t cpu_to_le64(uint64_t x)
+{
+ return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab64(x) : x;
+}
+
+INLINE float cpu_to_be_float(float x)
+{
+ return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab_float(x) : x;
+}
+
+INLINE float cpu_to_le_float(float x)
+{
+ return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab_float(x) : x;
+}
+
+INLINE uint16_t be16_to_cpu(uint16_t x)
+{
+ return cpu_to_be16(x);
+}
-INLINE uint16_t cpu_to_be16(uint16_t n);
-INLINE uint16_t cpu_to_be16(uint16_t n)
+INLINE uint16_t le16_to_cpu(uint16_t x)
{
- if (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN)
- n = n << 8 | n >> 8;
+ return cpu_to_le16(x);
+}
- return n;
+INLINE uint32_t be32_to_cpu(uint32_t x)
+{
+ return cpu_to_be32(x);
}
-INLINE uint16_t cpu_to_le16(uint16_t n);
-INLINE uint16_t cpu_to_le16(uint16_t n)
+INLINE uint32_t le32_to_cpu(uint32_t x)
{
- if (CPU_BYTE_ORDER == CPU_BIG_ENDIAN)
- n = n << 8 | n >> 8;
+ return cpu_to_le32(x);
+}
- return n;
+INLINE uint64_t be64_to_cpu(uint64_t x)
+{
+ return cpu_to_be64(x);
}
+INLINE uint64_t le64_to_cpu(uint64_t x)
+{
+ return cpu_to_le64(x);
+}
+
+INLINE float be_float_to_cpu(float x)
+{
+ return cpu_to_be_float(x);
+}
+
+INLINE float le_float_to_cpu(float x)
+{
+ return cpu_to_le_float(x);
+}
+
+INLINE uint16_t host_to_net16(uint16_t x)
+{
+ return cpu_to_be16(x);
+}
+
+INLINE uint16_t net_to_host16(uint16_t x)
+{
+ return be16_to_cpu(x);
+}
+
+INLINE uint32_t host_to_net32(uint32_t x)
+{
+ return cpu_to_be32(x);
+}
+
+INLINE uint32_t net_to_host32(uint32_t x)
+{
+ return be32_to_cpu(x);
+}
+
+INLINE uint64_t host_to_net64(uint64_t x)
+{
+ return cpu_to_be64(x);
+}
+
+INLINE uint64_t net_to_host64(uint64_t x)
+{
+ return be64_to_cpu(x);
+}
+
+INLINE float host_to_net_float(float x)
+{
+ return cpu_to_be_float(x);
+}
+
+INLINE float net_to_host_float(float x)
+{
+ return be_float_to_cpu(x);
+}
+
+#ifdef __cplusplus
+
+/// Type generic byte swapping.
+template<typename T>
+INLINE T swab(T x);
+
+template<> INLINE uint16_t swab(uint16_t x) { return swab16(x); }
+template<> INLINE uint32_t swab(uint32_t x) { return swab32(x); }
+template<> INLINE uint64_t swab(uint64_t x) { return swab64(x); }
+template<> INLINE int16_t swab(int16_t x) { return static_cast<int16_t>(swab16(static_cast<uint16_t>(x))); }
+template<> INLINE int32_t swab(int32_t x) { return static_cast<int32_t>(swab32(static_cast<uint32_t>(x))); }
+template<> INLINE int64_t swab(int64_t x) { return static_cast<int64_t>(swab64(static_cast<uint64_t>(x))); }
+template<> INLINE float swab(float x) { return swab_float(x); }
+
+/// Type generic conversion from CPU byte order to big-endian byte order.
+template<typename T>
+INLINE T cpu_to_be(T x)
+{
+ return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab(x) : x;
+}
+
+/// Type generic conversion from CPU byte-order to little-endian.
+template<typename T>
+INLINE T cpu_to_le(T x)
+{
+ return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab(x) : x;
+}
+
+/// Type generic conversion from big endian byte-order to CPU byte order.
+template<typename T>
+INLINE T be_to_cpu(T x)
+{
+ return cpu_to_be(x);
+}
+
+/// Type generic conversion from little-endian byte order to CPU byte order.
+template<typename T>
+INLINE T le_to_cpu(T x)
+{
+ return cpu_to_le(x);
+}
+
+/// Type generic conversion from network byte order to host byte order.
+template<typename T>
+INLINE T net_to_host(T x)
+{
+ return be_to_cpu(x);
+}
+
+/// Type generic conversion from host byte order to network byte order.
+template<typename T>
+INLINE T host_to_net(T x)
+{
+ return net_to_host(x);
+}
+
+#endif /* __cplusplus */
+
#endif /* MWARE_BYTEORDER_H */
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