X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=mware%2Fbyteorder.h;h=4730eb5bca9bd566b81ef2083031b650bc30b35b;hb=f76621bb61f5830efac4a110760ae357d0ffab0f;hp=cf7d137418aafca7bb91c3fe5fa3cbd910954cc3;hpb=aaed3ed803ffbd77b476d71055388cf00232469a;p=bertos.git

diff --git a/mware/byteorder.h b/mware/byteorder.h
index cf7d1374..4730eb5b 100755
--- a/mware/byteorder.h
+++ b/mware/byteorder.h
@@ -13,12 +13,24 @@
  * \author Stefano Fedrigo <aleph@develer.com>
  */
 
-/*
- * $Log$
- * Revision 1.1  2004/07/20 16:26:15  bernie
- * Import byte-order macros into DevLib.
- *
- */
+/*#*
+ *#* $Log$
+ *#* 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
@@ -26,22 +38,44 @@
 #include <compiler.h>
 #include <cpu.h>
 
-INLINE uint16_t cpu_to_be16(uint16_t n);
-INLINE uint16_t cpu_to_be16(uint16_t n)
+/*!
+ * \brief 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);
+}
+
+/*!
+ * \brief 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);
+}
+
+INLINE uint16_t cpu_to_be16(uint16_t x)
 {
-	if (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN)
-		n = n << 8 | n >> 8;
+	return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab16(x) : x;
+}
 
-	return n;
+INLINE uint16_t cpu_to_le16(uint16_t x)
+{
+	return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab16(x) : x;
 }
 
-INLINE uint16_t cpu_to_le16(uint16_t n);
-INLINE uint16_t cpu_to_le16(uint16_t n)
+INLINE uint32_t cpu_to_be32(uint32_t x)
 {
-	if (CPU_BYTE_ORDER == CPU_BIG_ENDIAN)
-		n = n << 8 | n >> 8;
+	return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab32(x) : x;
+}
 
-	return n;
+INLINE uint32_t cpu_to_le32(uint32_t x)
+{
+	return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab32(x) : x;
 }
 
 #endif /* MWARE_BYTEORDER_H */