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add helper functions for using u8 array as u4 array

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Dmitry Muhomor 2023-10-27 21:14:32 +03:00 committed by Daniel Micay
parent 8d5c631224
commit 19a46e0f96
1 changed files with 18 additions and 0 deletions
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18
util.h
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@ -1,6 +1,7 @@
#ifndef UTIL_H
#define UTIL_H
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@ -57,6 +58,23 @@ static inline size_t align(size_t size, size_t align) {
return (size + mask) & ~mask;
}
// u4_arr_{set,get} are helper functions for using u8 array as an array of unsigned 4-bit values.
static_assert(sizeof(u8) == 1, "unexpected u8 size");
// val is treated as a 4-bit value
static inline void u4_arr_set(u8 *arr, size_t idx, u8 val) {
size_t off = idx >> 1;
size_t shift = (idx & 1) << 2;
u8 mask = (u8) (0xf0 >> shift);
arr[off] = (arr[off] & mask) | (val << shift);
}
static inline u8 u4_arr_get(const u8 *arr, size_t idx) {
size_t off = idx >> 1;
size_t shift = (idx & 1) << 2;
return (u8) ((arr[off] >> shift) & 0xf);
}
COLD noreturn void fatal_error(const char *s);
#if CONFIG_SEAL_METADATA