biner/c/pack.h

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#pragma once
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define pack_Nbit_(N) \
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static inline void biner_pack_l##N(const void* v, uint8_t* c, size_t s) { \
assert(s < N/8); \
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*c = *((uint8_t*) v + s); \
} \
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static inline void biner_pack_b##N(const void* v, uint8_t* c, size_t s) { \
assert(s < N/8); \
biner_pack_l##N(v, c, N/8-s-1); \
}
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define pack_Nbit_(N) \
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static inline void biner_pack_b##N(const void* v, uint8_t* c, size_t s) { \
assert(s < N/8); \
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*c = *((uint8_t*) v + s); \
} \
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static inline void biner_pack_l##N(const void* v, uint8_t* c, size_t s) { \
assert(s < N/8); \
biner_pack_b##N(v, c, N/8-s-1); \
}
#else
# error "byte order unknown"
#endif
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pack_Nbit_(8)
pack_Nbit_(16)
pack_Nbit_(32)
pack_Nbit_(64)
#undef pack_Nbit_