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| author | Edward O'Callaghan <eocallaghan@alterapraxis.com> | 2014-02-12 21:53:44 +1100 |
|---|---|---|
| committer | Patrick Georgi <patrick@georgi-clan.de> | 2014-04-26 15:03:43 +0200 |
| commit | 6bedc274266b8b326860c2ab35ce8cb9ec7ccbb0 (patch) | |
| tree | 2f612ffc27ea207523f5356979b80b288f7954fa /payloads/libpayload | |
| parent | f33782fb86ec2862a875843c19a923c19b90cd48 (diff) | |
| download | coreboot-6bedc274266b8b326860c2ab35ce8cb9ec7ccbb0.tar.xz | |
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>
Reviewed-on: http://review.coreboot.org/5198
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'payloads/libpayload')
| -rw-r--r-- | payloads/libpayload/include/endian.h | 74 |
1 files changed, 72 insertions, 2 deletions
diff --git a/payloads/libpayload/include/endian.h b/payloads/libpayload/include/endian.h index cb5044380b..d4ddb5df4f 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_ */ |