move OTPHP to vendor/; additionally move Base32 class to OTPHP namespace

[tt-rss.git] / vendor / OTPHP / Base32.php

diff --git a/vendor/OTPHP/Base32.php b/vendor/OTPHP/Base32.php
new file mode 100644 (file)
index 0000000..f0dc2f1
--- /dev/null
+++ b/vendor/OTPHP/Base32.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace OTPHP;
+
+/**
+ * Encode in Base32 based on RFC 4648.
+ * Requires 20% more space than base64
+ * Great for case-insensitive filesystems like Windows and URL's  (except for = char which can be excluded using the pad option for urls)
+ *
+ * @package default
+ * @author Bryan Ruiz
+ **/
+class Base32 {
+
+   private static $map = array(
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', //  7
+        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15
+        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23
+        'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31
+        '='  // padding char
+    );
+
+   private static $flippedMap = array(
+        'A'=>'0', 'B'=>'1', 'C'=>'2', 'D'=>'3', 'E'=>'4', 'F'=>'5', 'G'=>'6', 'H'=>'7',
+        'I'=>'8', 'J'=>'9', 'K'=>'10', 'L'=>'11', 'M'=>'12', 'N'=>'13', 'O'=>'14', 'P'=>'15',
+        'Q'=>'16', 'R'=>'17', 'S'=>'18', 'T'=>'19', 'U'=>'20', 'V'=>'21', 'W'=>'22', 'X'=>'23',
+        'Y'=>'24', 'Z'=>'25', '2'=>'26', '3'=>'27', '4'=>'28', '5'=>'29', '6'=>'30', '7'=>'31'
+    );
+
+    /**
+     *    Use padding false when encoding for urls
+     *
+     * @return base32 encoded string
+     * @author Bryan Ruiz
+     **/
+    public static function encode($input, $padding = true) {
+        if(empty($input)) return "";
+        $input = str_split($input);
+        $binaryString = "";
+        for($i = 0; $i < count($input); $i++) {
+            $binaryString .= str_pad(base_convert(ord($input[$i]), 10, 2), 8, '0', STR_PAD_LEFT);
+        }
+        $fiveBitBinaryArray = str_split($binaryString, 5);
+        $base32 = "";
+        $i=0;
+        while($i < count($fiveBitBinaryArray)) {
+            $base32 .= self::$map[base_convert(str_pad($fiveBitBinaryArray[$i], 5,'0'), 2, 10)];
+            $i++;
+        }
+        if($padding && ($x = strlen($binaryString) % 40) != 0) {
+            if($x == 8) $base32 .= str_repeat(self::$map[32], 6);
+            else if($x == 16) $base32 .= str_repeat(self::$map[32], 4);
+            else if($x == 24) $base32 .= str_repeat(self::$map[32], 3);
+            else if($x == 32) $base32 .= self::$map[32];
+        }
+        return $base32;
+    }
+
+    public static function decode($input) {
+        if(empty($input)) return;
+        $paddingCharCount = substr_count($input, self::$map[32]);
+        $allowedValues = array(6,4,3,1,0);
+        if(!in_array($paddingCharCount, $allowedValues)) return false;
+        for($i=0; $i<4; $i++){
+            if($paddingCharCount == $allowedValues[$i] &&
+                substr($input, -($allowedValues[$i])) != str_repeat(self::$map[32], $allowedValues[$i])) return false;
+        }
+        $input = str_replace('=','', $input);
+        $input = str_split($input);
+        $binaryString = "";
+        for($i=0; $i < count($input); $i = $i+8) {
+            $x = "";
+            if(!in_array($input[$i], self::$map)) return false;
+            for($j=0; $j < 8; $j++) {
+                $x .= str_pad(base_convert(@self::$flippedMap[@$input[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
+            }
+            $eightBits = str_split($x, 8);
+            for($z = 0; $z < count($eightBits); $z++) {
+                $binaryString .= ( ($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48 ) ? $y:"";
+            }
+        }
+        return $binaryString;
+    }
+}
+