HEX_VALUE

const char[256] HEX_VALUE = {
	['0'] =  0, ['1'] =  1, ['2'] =  2, ['3'] =  3, ['4'] =  4,
	['5'] =  5, ['6'] =  6, ['7'] =  7, ['8'] =  8, ['9'] =  9,
	['A'] = 10, ['B'] = 11, ['C'] = 12, ['D'] = 13, ['E'] = 14,
	['F'] = 15, ['a'] = 10, ['b'] = 11, ['c'] = 12, ['d'] = 13,
	['e'] = 14, ['f'] = 15
};