* Array with bitmasks and such for pack/unpack methods to support both
* 32-bit and 64-bit systems
*/
- private static $packingData = array(
- 32 => array(
+ private static $packingData = [
+ 32 => [
'step' => 3,
'left' => 0xffff0000,
'right' => 0x0000ffff,
'factor' => 16,
'format' => 'II',
- ),
- 64 => array(
+ ],
+ 64 => [
'step' => 7,
'left' => 0xffffffff00000000,
'right' => 0x00000000ffffffff,
'factor' => 32,
'format' => 'NN'
- )
- );
+ ]
+ ];
+
+ /**
+ * Hexadecimal->Decimal translation array
+ */
+ private static $hexdec = [
+ '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
+ ];
+
+ /**
+ * Decimal->hexadecimal translation array
+ */
+ private static $dechex = [
+ 0 => '0',
+ 1 => '1',
+ 2 => '2',
+ 3 => '3',
+ 4 => '4',
+ 5 => '5',
+ 6 => '6',
+ 7 => '7',
+ 8 => '8',
+ 9 => '9',
+ 10 => 'a',
+ 11 => 'b',
+ 12 => 'c',
+ 13 => 'd',
+ 14 => 'e',
+ 15 => 'f'
+ ];
/**
* Simple 64-bit check, thanks to "Salman A" from stackoverflow.com:
return $price;
}
+ /**
+ * Converts a hexadecimal string, even with negative sign as first string to
+ * a decimal number using BC functions.
+ *
+ * This work is based on comment #86673 on php.net documentation page at:
+ * <http://de.php.net/manual/en/function.dechex.php#86673>
+ *
+ * @param $hex Hexadecimal string
+ * @return $dec Decimal number
+ */
+ public static function hex2dec (string $hex) {
+ // Convert to all lower-case
+ $hex = strtolower($hex);
+
+ // Detect sign (negative/positive numbers)
+ $sign = '';
+ if (substr($hex, 0, 1) == '-') {
+ $sign = '-';
+ $hex = substr($hex, 1);
+ }
+
+ // Decode the hexadecimal string into a decimal number
+ $dec = 0;
+ for ($i = strlen($hex) - 1, $e = 1; $i >= 0; $i--, $e = bcmul($e, 16)) {
+ $factor = self::$hexdec[substr($hex, $i, 1)];
+ $dec = bcadd($dec, bcmul($factor, $e));
+ }
+
+ // Return the decimal number
+ return $sign . $dec;
+ }
+
+ /**
+ * Converts even very large decimal numbers, also signed, to a hexadecimal
+ * string.
+ *
+ * This work is based on comment #97756 on php.net documentation page at:
+ * <http://de.php.net/manual/en/function.hexdec.php#97756>
+ *
+ * @param $dec Decimal number, even with negative sign
+ * @param $maxLength Optional maximum length of the string
+ * @return $hex Hexadecimal string
+ */
+ public static function dec2hex (string $dec, int $maxLength = 0) {
+ // maxLength can be zero or devideable by 2
+ assert(($maxLength == 0) || (($maxLength % 2) == 0));
+
+ // Detect sign (negative/positive numbers)
+ $sign = '';
+ if ($dec < 0) {
+ $sign = '-';
+ $dec = abs($dec);
+ }
+
+ // Encode the decimal number into a hexadecimal string
+ $hex = '';
+ do {
+ $hex = self::$dechex[($dec % (2 ^ 4))] . $hex;
+ $dec /= (2 ^ 4);
+ } while ($dec >= 1);
+
+ /*
+ * Leading zeros are required for hex-decimal "numbers". In some
+ * situations more leading zeros are wanted, so check for both
+ * conditions.
+ */
+ if ($maxLength > 0) {
+ // Prepend more zeros
+ $hex = str_pad($hex, $maxLength, '0', STR_PAD_LEFT);
+ } elseif ((strlen($hex) % 2) != 0) {
+ // Only make string's length dividable by 2
+ $hex = '0' . $hex;
+ }
+
+ // Return the hexadecimal string
+ return $sign . $hex;
+ }
+
+ /**
+ * Converts a ASCII string (0 to 255) into a decimal number.
+ *
+ * @param $asc The ASCII string to be converted
+ * @return $dec Decimal number
+ */
+ public static function asc2dec (string $asc) {
+ // Convert it into a hexadecimal number
+ $hex = bin2hex($asc);
+
+ // And back into a decimal number
+ $dec = self::hex2dec($hex);
+
+ // Return it
+ return $dec;
+ }
+
+ /**
+ * Converts a decimal number into an ASCII string.
+ *
+ * @param $dec Decimal number
+ * @return $asc An ASCII string
+ */
+ public static function dec2asc (string $dec) {
+ // First convert the number into a hexadecimal string
+ $hex = self::dec2hex($dec);
+
+ // Then convert it into the ASCII string
+ $asc = self::hex2asc($hex);
+
+ // Return it
+ return $asc;
+ }
+
+ /**
+ * Converts a hexadecimal number into an ASCII string. Negative numbers
+ * are not allowed.
+ *
+ * @param $hex Hexadecimal string
+ * @return $asc An ASCII string
+ */
+ public static function hex2asc ($hex) {
+ // Check for length, it must be devideable by 2
+ //* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('hex='.$hex);
+ assert((strlen($hex) % 2) == 0);
+
+ // Walk the string
+ $asc = '';
+ for ($idx = 0; $idx < strlen($hex); $idx+=2) {
+ // Get the decimal number of the chunk
+ $part = hexdec(substr($hex, $idx, 2));
+
+ // Add it to the final string
+ $asc .= chr($part);
+ }
+
+ // Return the final string
+ return $asc;
+ }
+
/**
* Pack a string into a "binary format". Please execuse me that this is
* widely undocumented. :-(
projects / core.git / blobdiff