update utils

src/Support/Utils.php

@@ -1,6 +1,8 @@
 <?php
 namespace IEXBase\TronAPI\Support;
 
+use InvalidArgumentException;
+
 class Utils
 {
     /**
@@ -14,22 +16,85 @@ public static function isValidUrl($url) :bool {
     }
 
     /**
-     * Check if the string is a 16th notation
+     * Check whether the passed parameter is an array
      *
-     * @param $str
+     * @param $array
      * @return bool
      */
-    public static function isHex($str) : bool {
-        return is_string($str) && !is_nan(intval($str,16));
+    public static function isArray($array) : bool {
+        return is_array($array);
     }
 
     /**
-     * Check whether the passed parameter is an array
+     * isZeroPrefixed
      *
-     * @param $array
+     * @param string
      * @return bool
      */
-    public static function isArray($array) : bool {
-        return is_array($array);
+    public static function isZeroPrefixed($value)
+    {
+        if (!is_string($value)) {
+            throw new InvalidArgumentException('The value to isZeroPrefixed function must be string.');
+        }
+        return (strpos($value, '0x') === 0);
+    }
+
+    /**
+     * stripZero
+     *
+     * @param string $value
+     * @return string
+     */
+    public static function stripZero($value)
+    {
+        if (self::isZeroPrefixed($value)) {
+            $count = 1;
+            return str_replace('0x', '', $value, $count);
+        }
+        return $value;
+    }
+
+    /**
+     * isNegative
+     *
+     * @param string
+     * @return bool
+     */
+    public static function isNegative($value)
+    {
+        if (!is_string($value)) {
+            throw new InvalidArgumentException('The value to isNegative function must be string.');
+        }
+        return (strpos($value, '-') === 0);
+    }
+
+    /**
+     * isHex
+     *
+     * @param string $value
+     * @return bool
+     */
+    public static function isHex($value)
+    {
+        return (is_string($value) && preg_match('/^(0x)?[a-f0-9]*$/', $value) === 1);
+    }
+
+    /**
+     * hexToBin
+     *
+     * @param string
+     * @return string
+     */
+    public static function hexToBin($value)
+    {
+        if (!is_string($value)) {
+            throw new InvalidArgumentException('The value to hexToBin function must be string.');
+        }
+        if (self::isZeroPrefixed($value)) {
+            $count = 1;
+            $value = str_replace('0x', '', $value, $count);
+        }
+        return pack('H*', $value);
     }
+
 }