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This commit is contained in:
iceman1001 2025-06-22 20:34:54 +02:00
commit 5de4dd68e5
15 changed files with 107 additions and 66 deletions
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37
common/commonutil.c
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@ -450,6 +450,43 @@ void lslx(uint8_t *d, size_t n, uint8_t shifts) {
}
}
// right shift an array of length one bit
void rsl(uint8_t *d, size_t n) {
uint8_t carry = 0;
for (size_t i = 0; i < n; i++) {
// Save the LSB before shifting
uint8_t new_carry = d[i] & 0x1;
// Shift current byte right and incorporate previous carry
d[i] = (d[i] >> 1) | (carry ? 0x80 : 0);
// Update carry for next byte
carry = new_carry;
}
}
void rslx(uint8_t *d, size_t n, uint8_t shifts) {
uint8_t carry = 0;
for (uint8_t j = 0; j < shifts; j++) {
for (size_t i = 0; i < n; i++) {
// Save the LSB before shifting
uint8_t new_carry = d[i] & 0x1;
// Shift current byte right and incorporate previous carry
d[i] = (d[i] >> 1) | (carry ? 0x80 : 0);
// Update carry for next byte
carry = new_carry;
}
}
}
// BSWAP24 of array[3]
uint32_t le24toh(const uint8_t data[3]) {

3
common/commonutil.h
View file

@ -135,6 +135,9 @@ void xor(uint8_t *dest, const uint8_t *src, size_t n);
void lsl(uint8_t *d, size_t n);
void lslx(uint8_t *d, size_t n, uint8_t shifts);
void rsl(uint8_t *d, size_t n);
void rslx(uint8_t *d, size_t n, uint8_t shifts);
uint32_t le24toh(const uint8_t data[3]);
void htole24(uint32_t val, uint8_t data[3]);