Patch set updated for coreboot: 3d0acae libpayload/endian.h: Provide alignment-agnostic enc/dec bytestreams.

[Edward O'Callaghan]

Edward O'Callaghan ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5198

-gerrit

commit 3d0acaea71ecad3f75b8995312edbaffaccb6342
Author: Edward O'Callaghan 
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 alignment in big/little
    endian format. See BYTEORDER(9).

Change-Id: I73a174b9c02c467bc60590c5cd894dac58b8683a
    Signed-off-by: Edward O'Callaghan 
---
 payloads/libpayload/include/endian.h | 41 ++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/payloads/libpayload/include/endian.h b/payloads/libpayload/include/endian.h
index cb50443..52c2062 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 +87,43 @@ 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.
+ */
+
+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 leXXenc(void *pp, uint16_t u, uint8_t b)
+{
+  unsigned char *p = (unsigned char *)pp;
+
+  for(int i=0; i < b; i++)
+    p[i] = (u >> i*8) & 0xFF;
+}
+
+
+static inline void le16enc(void *pp, uint16_t u)
+{
+  leXXenc(pp, u, 2);
+}
+
+static inline void le32enc(void *pp, uint32_t u)
+{
+  leXXenc(pp, u, 4);
+}
+
 /* Deprecated names (not in glibc / BSD) */
 #define htobew(in) htobe16(in)
 #define htobel(in) htobe32(in)
@@ -101,4 +138,4 @@ static inline uint64_t swap_bytes64(uint64_t in)
 #define letohl(in) le32toh(in)
 #define letohll(in) le64toh(in)

-#endif
+#endif /* _ENDIAN_H_ */