gmt-makemap/modules/gmt/modgmt_colornames.h

#ifndef MODGMT_COLORNAMES_H
#define MODGMT_COLORNAMES_H

struct colorname {const char *name; double r; double g; double b; };
#include <string.h>

class ColorHash
{
private:
  static inline unsigned int colornamehash (const char *str, unsigned int len);
public:
  static const struct colorname *in_colors_set (const char *str, unsigned int len);
};

inline unsigned int
ColorHash::colornamehash (const char *str, unsigned int len)
{
  static const unsigned short asso_values[] =
    {
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,  666,   27,
        26,   23,   22,  789,  588,  587,  501,  436, 2728, 2728,
      2728, 2728, 2728, 2728, 2728,   61,   96,  222,   98,   22,
       117,   22,  561,  559,   22,  708,  179,  301,   42,  101,
       242,   46,   23,   22,  116,  171,  821,  809, 2728,  169,
      2728, 2728, 2728, 2728, 2728, 2728, 2728,   61,   96,  222,
        98,   22,  117,   22,  561,  559,   22,  708,  179,  301,
        42,  101,  242,   46,   23,   22,  116,  171,  821,  809,
      2728,  169, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728, 2728,
      2728, 2728, 2728, 2728, 2728, 2728
    };
  int hval = len;

  switch (hval)
    {
      default:
        hval += asso_values[(unsigned char)str[12]];
      /*FALLTHROUGH*/
      case 12:
        hval += asso_values[(unsigned char)str[11]];
      /*FALLTHROUGH*/
      case 11:
      case 10:
      case 9:
      case 8:
        hval += asso_values[(unsigned char)str[7]];
      /*FALLTHROUGH*/
      case 7:
        hval += asso_values[(unsigned char)str[6]];
      /*FALLTHROUGH*/
      case 6:
        hval += asso_values[(unsigned char)str[5]];
      /*FALLTHROUGH*/
      case 5:
        hval += asso_values[(unsigned char)str[4]];
      /*FALLTHROUGH*/
      case 4:
      case 3:
        hval += asso_values[(unsigned char)str[2]];
      /*FALLTHROUGH*/
      case 2:
      case 1:
        hval += asso_values[(unsigned char)str[0]];
        break;
    }
  return hval + asso_values[(unsigned char)str[len - 1]];
}

#endif