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support function

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This commit is contained in:
iceman1001 2024-04-22 09:29:38 +02:00
commit ac809c4a9f
2 changed files with 11 additions and 0 deletions
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10
common/commonutil.c
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@ -144,6 +144,16 @@ uint32_t reflect32(uint32_t b) {
return v;
}
uint64_t reflect64(uint64_t b) {
// https://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable
uint64_t v = b; // 32-bit word to reverse bit order
// swap 2-byte long pairs
uint64_t v1 = reflect32(v >> 32);
uint64_t v2 = reflect32(v);
v = (v1 << 32) | (v2 & 0xFFFFFFFF);
return v;
}
void num_to_bytes(uint64_t n, size_t len, uint8_t *dest) {
while (len--) {
dest[len] = (uint8_t) n;

1
common/commonutil.h
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@ -74,6 +74,7 @@ uint32_t reflect(uint32_t v, int b); // used in crc.c ...
uint8_t reflect8(uint8_t b); // dedicated 8bit reversal
uint16_t reflect16(uint16_t b); // dedicated 16bit reversal
uint32_t reflect32(uint32_t b); // dedicated 32bit reversal
uint64_t reflect64(uint64_t b); // dedicated 64bit reversal
void num_to_bytes(uint64_t n, size_t len, uint8_t *dest);
uint64_t bytes_to_num(const uint8_t *src, size_t len);