libmach

src/libmach/swap.c

@@ -0,0 +1,118 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <mach.h>
+
+/*
+ * big-endian short
+ */
+u16int
+beswap2(u16int s)
+{
+	uchar *p;
+
+	p = (uchar*)&s;
+	return (p[0]<<8) | p[1];
+}
+
+/*
+ * big-endian long
+ */
+u32int
+beswap4(u32int l)
+{
+	uchar *p;
+
+	p = (uchar*)&l;
+	return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
+}
+
+/*
+ * big-endian vlong
+ */
+u64int
+beswap8(u64int v)
+{
+	uchar *p;
+
+	p = (uchar*)&v;
+	return ((u64int)p[0]<<56) | ((u64int)p[1]<<48) | ((u64int)p[2]<<40)
+				 | ((u64int)p[3]<<32) | ((u64int)p[4]<<24)
+				 | ((u64int)p[5]<<16) | ((u64int)p[6]<<8)
+				 | (u64int)p[7];
+}
+
+/*
+ * little-endian short
+ */
+u16int
+leswap2(u16int s)
+{
+	uchar *p;
+
+	p = (uchar*)&s;
+	return (p[1]<<8) | p[0];
+}
+
+/*
+ * little-endian long
+ */
+u32int
+leswap4(u32int l)
+{
+	uchar *p;
+
+	p = (uchar*)&l;
+	return (p[3]<<24) | (p[2]<<16) | (p[1]<<8) | p[0];
+}
+
+/*
+ * little-endian vlong
+ */
+u64int
+leswap8(u64int v)
+{
+	uchar *p;
+
+	p = (uchar*)&v;
+	return ((u64int)p[7]<<56) | ((u64int)p[6]<<48) | ((u64int)p[5]<<40)
+				 | ((u64int)p[4]<<32) | ((u64int)p[3]<<24)
+				 | ((u64int)p[2]<<16) | ((u64int)p[1]<<8)
+				 | (u64int)p[0];
+}
+
+u16int
+leload2(uchar *b)
+{
+	return b[0] | (b[1]<<8);
+}
+
+u32int
+leload4(uchar *b)
+{
+	return b[0] | (b[1]<<8) | (b[2]<<16) | (b[3]<<24);
+}
+
+u64int
+leload8(uchar *b)
+{
+	return leload4(b) | ((uvlong)leload4(b+4) << 32);
+}
+
+u16int
+beload2(uchar *b)
+{
+	return (b[0]<<8) | b[1];
+}
+
+u32int
+beload4(uchar *b)
+{
+	return (b[0]<<24) | (b[1]<<16) | (b[2]<<8) | b[3];
+}
+
+u64int
+beload8(uchar *b)
+{
+	return ((uvlong)beload4(b) << 32) | beload4(b+4);
+}