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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>
This commit is contained in:
Edward O'Callaghan 2014-02-12 21:53:44 +11:00 committed by Patrick Georgi
parent f33782fb86
commit 6bedc27426
1 changed files with 72 additions and 2 deletions
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74
payloads/libpayload/include/endian.h
View File

@ -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_ */