Edward O'Callaghan (eocallaghan@alterapraxis.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/5198
-gerrit
commit f04a2e2c1358bf07427ea4a448581507aa13ac34 Author: Edward O'Callaghan eocallaghan@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 alignment in big/little endian format. See BYTEORDER(9).
Change-Id: I73a174b9c02c467bc60590c5cd894dac58b8683a Signed-off-by: Edward O'Callaghan eocallaghan@alterapraxis.com --- payloads/libpayload/include/endian.h | 74 +++++++++++++++++++++++++++++++++++- 1 file changed, 72 insertions(+), 2 deletions(-)
diff --git a/payloads/libpayload/include/endian.h b/payloads/libpayload/include/endian.h index cb50443..d4ddb5d 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 +87,76 @@ 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 be16dec(const void *pp) +{ + uint8_t const *p = (uint8_t const *)pp; + + return ((p[0] << 8) | p[1]); +} + +static inline uint32_t be32dec(const void *pp) +{ + uint8_t const *p = (uint8_t const *)pp; + + return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); +} + +static inline uint16_t le16dec(const void *pp) +{ + uint8_t const *p = (uint8_t const *)pp; + + return ((p[1] << 8) | p[0]); +} + +static inline uint32_t le32dec(const void *pp) +{ + uint8_t const *p = (uint8_t const *)pp; + + return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); +} + +static inline void bebitenc(void *pp, uint32_t u, uint8_t b) +{ + uint8_t *p = (uint8_t *)pp; + int i; + + for (i = (b - 1); i >= 0; i++) + p[i] = (u >> i*8) & 0xFF; +} + +static inline void be16enc(void *pp, uint16_t u) +{ + bebitenc(pp, u, 2); +} + +static inline void be32enc(void *pp, uint32_t u) +{ + bebitenc(pp, u, 4); +} + +static inline void lebitenc(void *pp, uint32_t u, uint8_t b) +{ + uint8_t *p = (uint8_t *)pp; + int i; + + for (i = 0; i < b; i++) + p[i] = (u >> i*8) & 0xFF; +} + +static inline void le16enc(void *pp, uint16_t u) +{ + lebitenc(pp, u, 2); +} + +static inline void le32enc(void *pp, uint32_t u) +{ + lebitenc(pp, u, 4); +} + /* Deprecated names (not in glibc / BSD) */ #define htobew(in) htobe16(in) #define htobel(in) htobe32(in) @@ -101,4 +171,4 @@ static inline uint64_t swap_bytes64(uint64_t in) #define letohl(in) le32toh(in) #define letohll(in) le64toh(in)
-#endif +#endif /* _ENDIAN_H_ */