+void num_to_bytebits(uint64_t n, size_t len, uint8_t *dest) {
+ while (len--) {
+ dest[len] = n & 1;
+ n >>= 1;
+ }
+}
+
+//least significant bit first
+void num_to_bytebitsLSBF(uint64_t n, size_t len, uint8_t *dest) {
+ for(int i = 0 ; i < len ; ++i) {
+ dest[i] = n & 1;
+ n >>= 1;
+ }
+}
+
+// Swap bit order on a uint32_t value. Can be limited by nrbits just use say 8bits reversal
+// And clears the rest of the bits.
+uint32_t SwapBits(uint32_t value, int nrbits) {
+ uint32_t newvalue = 0;
+ for(int i = 0; i < nrbits; i++) {
+ newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
+ }
+ return newvalue;
+}
+
+// aa,bb,cc,dd,ee,ff,gg,hh, ii,jj,kk,ll,mm,nn,oo,pp
+// to
+// hh,gg,ff,ee,dd,cc,bb,aa, pp,oo,nn,mm,ll,kk,jj,ii
+// up to 64 bytes or 512 bits
+uint8_t *SwapEndian64(const uint8_t *src, const size_t len, const uint8_t blockSize){
+ static uint8_t buf[64];
+ memset(buf, 0x00, 64);
+ uint8_t *tmp = buf;
+ for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
+ for (size_t i = 0; i < blockSize; i++){
+ tmp[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
+ }
+ }
+ return tmp;
+}
+
+// takes a uint8_t src array, for len items and reverses the byte order in blocksizes (8,16,32,64),
+// returns: the dest array contains the reordered src array.
+void SwapEndian64ex(const uint8_t *src, const size_t len, const uint8_t blockSize, uint8_t *dest){
+ for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){
+ for (size_t i = 0; i < blockSize; i++){
+ dest[i+(blockSize*block)] = src[(blockSize-1-i)+(blockSize*block)];
+ }
+ }
+}
+