Function OctaHash40

cld2/internal/cldutil_shared.cc:348–354

OCTAGRAM wrapper with surrounding spaces Pick up 1..24 bytes plus pre/post space and hash them via mask/shift/add UNDERSHOOTS 1 byte, OVERSHOOTS up to 3 bytes The low 32 bits follow the pattern from above, tuned to different scripts The high 8 bits are a simple sum of all bytes, shifted by 0/1/2/3 bits each For runtime use of tables V3

// The high 8 bits are a simple sum of all bytes, shifted by 0/1/2/3 bits each
// For runtime use of tables V3
uint64 OctaHash40(const char* word_ptr, int bytecount) {
  if (bytecount == 0) {return 0;}
  uint64 prepost = 0;
  if (word_ptr[-1] == ' ') {prepost |= kPreSpaceIndicator;}
  if (word_ptr[bytecount] == ' ') {prepost |= kPostSpaceIndicator;}
  return OctaHash40Mix(word_ptr, bytecount, prepost);
}


// OCTAGRAM wrapper with surrounding underscores (offline use)