+
+void xor(unsigned char * dst, unsigned char * src, size_t len) {
+ for( ; len > 0; len--,dst++,src++)
+ *dst ^= *src;
+}
+
+int32_t le24toh (uint8_t data[3]) {
+ return (data[2] << 16) | (data[1] << 8) | data[0];
+}
+
+
+uint32_t PackBits(uint8_t start, uint8_t len, uint8_t* bits) {
+
+ int i = start;
+ int j = len-1;
+
+ if (len > 32) return 0;
+
+ uint32_t tmp = 0;
+ for (; j >= 0; --j, ++i)
+ tmp |= bits[i] << j;
+
+ return tmp;
+}