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added support function for left shifting arrays

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iceman1001 2025-03-19 08:57:20 +01:00
commit 49d25920c1
2 changed files with 18 additions and 5 deletions
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19
common/commonutil.c
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@ -433,11 +433,21 @@ void xor(uint8_t *dest, const uint8_t *src, size_t n) {
} }
} }
void lsl(uint8_t *data, size_t len) { // left shift an array of length one bit
for (size_t n = 0; n < len - 1; n++) { void lsl(uint8_t *d, size_t n) {
data[n] = (data[n] << 1) | (data[n + 1] >> 7); for (size_t i = 0; i < n - 1; i++) {
d[i] = (d[i] << 1) | (d[i + 1] >> 7);
}
d[n - 1] <<= 1;
}
void lslx(uint8_t *d, size_t n, uint8_t shifts) {
for (uint8_t i = 0; i < shifts; i++) {
for (size_t j = 0; j < n - 1; j++) {
d[j] = (d[j] << 1) | (d[j + 1] >> 7);
}
d[n - 1] <<= 1;
} }
data[len - 1] <<= 1;
} }
@ -562,6 +572,7 @@ void reverse_arraybytes_copy(uint8_t *arr, uint8_t *dest, size_t len) {
*/ */
size_t concatbits(uint8_t *dest, int dest_offset, const uint8_t *src, int src_offset, size_t nbits, bool src_lsb) { size_t concatbits(uint8_t *dest, int dest_offset, const uint8_t *src, int src_offset, size_t nbits, bool src_lsb) {
int i, end, step; int i, end, step;
// overlap // overlap
if ((src - dest) * 8 + src_offset - dest_offset > 0) { if ((src - dest) * 8 + src_offset - dest_offset > 0) {
i = 0; i = 0;

4
common/commonutil.h
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@ -132,7 +132,9 @@ void rol(uint8_t *data, const size_t n);
void ror(uint8_t *data, const size_t n); void ror(uint8_t *data, const size_t n);
void xor(uint8_t *dest, const uint8_t *src, size_t n); void xor(uint8_t *dest, const uint8_t *src, size_t n);
void lsl(uint8_t *data, size_t len); void lsl(uint8_t *d, size_t n);
void lslx(uint8_t *d, size_t n, uint8_t shifts);
uint32_t le24toh(const uint8_t data[3]); uint32_t le24toh(const uint8_t data[3]);
void htole24(uint32_t val, uint8_t data[3]); void htole24(uint32_t val, uint8_t data[3]);