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libc: improve encoding routines

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This commit is contained in:
Hugues Delorme 2013-01-24 11:28:59 +01:00
parent 2eeef375c7
commit d3c56f7a52
1 changed files with 19 additions and 11 deletions
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30
src/c/endian.c
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@ -2,14 +2,6 @@
#include <string.h> #include <string.h>
#define _INTERNAL_FOUG_ENCODE_NUMERIC_LE(NUMERIC_TYPE) \
union { \
NUMERIC_TYPE as_numeric; \
uint8_t as_bytes[sizeof(NUMERIC_TYPE)]; \
} u; \
u.as_numeric = val; \
memcpy(bytes, u.as_bytes, sizeof(NUMERIC_TYPE));
foug_endianness_t foug_host_endianness() foug_endianness_t foug_host_endianness()
{ {
union { union {
@ -54,7 +46,8 @@ uint16_t foug_decode_uint16_be(const uint8_t* bytes)
void foug_encode_uint16_le(uint16_t val, uint8_t* bytes) void foug_encode_uint16_le(uint16_t val, uint8_t* bytes)
{ {
_INTERNAL_FOUG_ENCODE_NUMERIC_LE(uint16_t); bytes[0] = val & 0xFF;
bytes[1] = (val >> 8) & 0xFF;
} }
uint32_t foug_uint32_swap(uint32_t val) uint32_t foug_uint32_swap(uint32_t val)
@ -91,7 +84,10 @@ uint32_t foug_decode_uint32_be(const uint8_t* bytes)
void foug_encode_uint32_le(uint32_t val, uint8_t* bytes) void foug_encode_uint32_le(uint32_t val, uint8_t* bytes)
{ {
_INTERNAL_FOUG_ENCODE_NUMERIC_LE(uint32_t); bytes[0] = val & 0xFF;
bytes[1] = (val >> 8) & 0xFF;
bytes[2] = (val >> 16) & 0xFF;
bytes[3] = (val >> 24) & 0xFF;
} }
static foug_real32_t convert_real32(uint32_t val) static foug_real32_t convert_real32(uint32_t val)
@ -106,6 +102,18 @@ static foug_real32_t convert_real32(uint32_t val)
return u.as_float; return u.as_float;
} }
static uint32_t convert_uint32(foug_real32_t val)
{
union
{
uint32_t as_integer;
foug_real32_t as_float;
} u;
u.as_float = val;
return u.as_integer;
}
foug_real32_t foug_decode_real32_le(const uint8_t* bytes) foug_real32_t foug_decode_real32_le(const uint8_t* bytes)
{ {
return convert_real32(foug_decode_uint32_le(bytes)); return convert_real32(foug_decode_uint32_le(bytes));
@ -123,5 +131,5 @@ foug_real32_t foug_decode_real32_be(const uint8_t* bytes)
void foug_encode_real32_le(foug_real32_t val, uint8_t* bytes) void foug_encode_real32_le(foug_real32_t val, uint8_t* bytes)
{ {
_INTERNAL_FOUG_ENCODE_NUMERIC_LE(foug_real32_t); foug_encode_uint32_le(convert_uint32(val), bytes);
} }