-/*!
+/**
* \file
* <!--
* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
- * This file is part of DevLib - See devlib/README for information.
+ * This file is part of DevLib - See README.devlib for information.
* -->
*
* \brief Functions to convert integers to/from host byte-order.
* \author Stefano Fedrigo <aleph@develer.com>
*/
-/*
- * $Log$
- * Revision 1.2 2004/07/20 17:09:11 bernie
- * swab16(), swab32(), cpu_to_be32(), cpu_to_le32(): New functions.
- *
- * Revision 1.1 2004/07/20 16:26:15 bernie
- * Import byte-order macros into DevLib.
- *
- */
+/*#*
+ *#* $Log$
+ *#* Revision 1.10 2006/06/10 05:37:03 bernie
+ *#* Convert to new Doxygen comments.
+ *#*
+ *#* Revision 1.9 2005/11/04 16:20:02 bernie
+ *#* Fix reference to README.devlib in header.
+ *#*
+ *#* Revision 1.8 2005/06/14 06:16:03 bernie
+ *#* Add all missing functions.
+ *#*
+ *#* Revision 1.7 2005/04/12 04:08:49 bernie
+ *#* host_to_net(16|32)(), net_to_host(16|32)(): New functions.
+ *#*
+ *#* Revision 1.6 2005/04/11 19:10:28 bernie
+ *#* Include top-level headers from cfg/ subdir.
+ *#*
+ *#* Revision 1.5 2004/08/25 14:12:09 rasky
+ *#* Aggiornato il comment block dei log RCS
+ *#*
+ *#* Revision 1.4 2004/07/22 01:08:43 bernie
+ *#* swab32(): Fix a very serious bug.
+ *#*
+ *#* Revision 1.3 2004/07/20 23:47:12 bernie
+ *#* Finally remove redundant protos.
+ *#*
+ *#* Revision 1.2 2004/07/20 17:09:11 bernie
+ *#* swab16(), swab32(), cpu_to_be32(), cpu_to_le32(): New functions.
+ *#*
+ *#* 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 <cfg/cpu.h>
-/*!
- * \brief Swap upper and lower bytes in a 16-bit value.
+/**
+ * Swap upper and lower bytes in a 16-bit value.
*/
-INLINE uint16_t swab16(uint16_t x);
INLINE uint16_t swab16(uint16_t x)
{
return ((x & (uint16_t)0x00FFU) << 8)
| ((x & (uint16_t)0xFF00U) >> 8);
}
-/*!
- * \brief Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
+/**
+ * Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
*/
-INLINE uint16_t swab32(uint16_t x);
-INLINE uint16_t swab32(uint16_t x)
+INLINE uint32_t swab32(uint32_t x)
{
return ((x & (uint32_t)0x000000FFUL) << 24)
| ((x & (uint32_t)0x0000FF00UL) << 8)
| ((x & (uint32_t)0xFF000000UL) >> 24);
}
-INLINE uint16_t cpu_to_be16(uint16_t x);
+/**
+ * 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);
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);
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);
INLINE uint32_t cpu_to_le32(uint32_t x)
{
return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab32(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 le16_to_cpu(uint16_t x)
+{
+ return cpu_to_le16(x);
+}
+
+INLINE uint32_t be32_to_cpu(uint32_t x)
+{
+ return cpu_to_be32(x);
+}
+
+INLINE uint32_t le32_to_cpu(uint32_t x)
+{
+ return cpu_to_le32(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 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 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 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 */
projects / bertos.git / blobdiff