[coreboot-gerrit] New patch to review for coreboot: 20fa65e libpayload/endian.h: Provide alignment-agnostic enc/dec bytestreams.
Edward O'Callaghan (eocallaghan@alterapraxis.com)
gerrit at coreboot.org
Wed Feb 12 11:59:30 CET 2014
Edward O'Callaghan (eocallaghan at alterapraxis.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5198
-gerrit
commit 20fa65e11d53f4aeddf2f93370202a81bdbf6f98
Author: Edward O'Callaghan <eocallaghan at alterapraxis.com>
Date: Wed Feb 12 21:53:44 2014 +1100
libpayload/endian.h: Provide alignment-agnostic enc/dec bytestreams.
Alignment-agnostic encode/decode bytestream to/from little/big endian.
The le16enc(), le16dec(), le32enc(), le32dec() functions encode and
decode integers to/from byte strings on any align- ment in big/little
endian format. See BYTEORDER(9).
Change-Id: I73a174b9c02c467bc60590c5cd894dac58b8683a
Signed-off-by: Edward O'Callaghan <eocallaghan at alterapraxis.com>
---
payloads/libpayload/include/endian.h | 44 ++++++++++++++++++++++++++++++++++--
1 file changed, 42 insertions(+), 2 deletions(-)
diff --git a/payloads/libpayload/include/endian.h b/payloads/libpayload/include/endian.h
index cb50443..c670fb1 100644
--- a/payloads/libpayload/include/endian.h
+++ b/payloads/libpayload/include/endian.h
@@ -69,7 +69,7 @@ static inline uint64_t swap_bytes64(uint64_t in)
#error Cant tell if the CPU is little or big endian.
-#endif
+#endif /* CONFIG_*_ENDIAN */
#define be16toh(in) htobe16(in)
#define be32toh(in) htobe32(in)
@@ -87,6 +87,46 @@ static inline uint64_t swap_bytes64(uint64_t in)
#define ntohl(in) be32toh(in)
#define ntohll(in) be64toh(in)
+/* Alignment-agnostic encode/decode bytestream to/from little/big endian.
+ * Note: Trimmed down from FreeBSD 10.0 (sys/endian.h).
+ */
+
+static __inline uint16_t
+le16dec(const void *pp)
+{
+ unsigned char const *p = (unsigned char const *)pp;
+
+ return ((p[1] << 8) | p[0]);
+}
+
+static __inline uint32_t
+le32dec(const void *pp)
+{
+ unsigned char const *p = (unsigned char const *)pp;
+
+ return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
+}
+
+static __inline void
+le16enc(void *pp, uint16_t u)
+{
+ unsigned char *p = (unsigned char *)pp;
+
+ p[0] = u & 0xff;
+ p[1] = (u >> 8) & 0xff;
+}
+
+static __inline void
+le32enc(void *pp, uint32_t u)
+{
+ unsigned char *p = (unsigned char *)pp;
+
+ p[0] = u & 0xff;
+ p[1] = (u >> 8) & 0xff;
+ p[2] = (u >> 16) & 0xff;
+ p[3] = (u >> 24) & 0xff;
+}
+
/* Deprecated names (not in glibc / BSD) */
#define htobew(in) htobe16(in)
#define htobel(in) htobe32(in)
@@ -101,4 +141,4 @@ static inline uint64_t swap_bytes64(uint64_t in)
#define letohl(in) le32toh(in)
#define letohll(in) le64toh(in)
-#endif
+#endif /* _ENDIAN_H_ */
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