Simplify endianness and fix for unaligned reads (bug #3867)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@5295 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 95 insertions, 0 deletions

diff --git a/include/asterisk/unaligned.h b/include/asterisk/unaligned.h
new file mode 100755
index 000000000..fc012049f
--- /dev/null
+++ b/include/asterisk/unaligned.h
@@ -0,0 +1,95 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Asterisk internal frame definitions.
+ * 
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU Lesser General Public License.  Other components of
+ * Asterisk are distributed under The GNU General Public License
+ * only.
+ */
+
+#ifndef _ASTERISK_UNALIGNED_H
+#define _ASTERISK_UNALIGNED_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#ifdef __GNUC__
+/* If we just tell GCC what's going on, we can trust it to behave optimally */
+static inline unsigned int get_unaligned_uint32(void *p)
+{
+	struct { unsigned int d; } __attribute__((packed)) *pp = (void *)p;
+
+	return pp->d;
+}
+static inline unsigned short get_unaligned_uint16(void *p)
+{
+	struct { unsigned short d; } __attribute__((packed)) *pp = (void *)p;
+
+	return pp->d;
+}
+
+static inline void put_unaligned_uint32(void *p, unsigned int datum)
+{
+	struct { unsigned int d; } __attribute__((packed)) *pp = (void *)p;
+
+	pp->d = datum;
+}
+
+static inline void put_unaligned_uint16(void *p, unsigned short datum)
+{
+	struct { unsigned short d; } __attribute__((packed)) *pp = (void *)p;
+
+	pp->d = datum;
+}
+#elif defined(SOLARIS) && defined(__sparc__)
+static inline unsigned int get_unaligned_uint32(void *p)
+{
+	unsigned char *cp = p;
+
+	return (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
+}
+
+static inline unsigned short get_unaligned_uint16(void *p)
+{
+	unsigned char *cp = p;
+
+	return (cp[0] << 8) | cp[1] ;
+}
+
+static inline void put_unaligned_uint32(void *p, unsigned int datum)
+{
+	unsigned char *cp = p;
+
+	cp[0] = datum >> 24;
+	cp[1] = datum >> 16;
+	cp[2] = datum >> 8;
+	cp[3] = datum;
+}
+
+static inline void put_unaligned_uint16(void *p, unsigned int datum)
+{
+	unsigned char *cp = p;
+
+	cp[0] = datum >> 8;
+	cp[1] = datum;
+}
+#else /* Not GCC, not Solaris/SPARC. Assume we can handle direct load/store. */
+#define get_unaligned_uint32(p) (*((unsigned int *)(p)))
+#define get_unaligned_uint16(p) (*((unsigned short *)(p)))
+#define put_unaligned_uint32(p,d) do { unsigned int *__P = (p); *__P = d; } while(0)
+#define put_unaligned_uint16(p,d) do { unsigned short *__P = (p); *__P = d; } while(0)
+#endif
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+
+#endif /* _ASTERISK_UNALIGNED_H */