first commit

2018-12-12 07:32:23 +01:00
commit 8b139acd6e
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+<?php
+/**
+ * @package    Grav.Common.Helpers
+ *
+ * @copyright  Copyright (C) 2015 - 2018 Trilby Media, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Common\Helpers;
+
+class Base32 {
+    protected static $base32Chars =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+    protected static $base32Lookup = array(
+        0xFF,0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, // '0', '1', '2', '3', '4', '5', '6', '7'
+        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, // '8', '9', ':', ';', '<', '=', '>', '?'
+        0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, // '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G'
+        0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, // 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O'
+        0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, // 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W'
+        0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF, // 'X', 'Y', 'Z', '[', '\', ']', '^', '_'
+        0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, // '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g'
+        0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, // 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o'
+        0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, // 'p', 'q', 'r', 's', 't', 'u', 'v', 'w'
+        0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF  // 'x', 'y', 'z', '{', '|', '}', '~', 'DEL'
+    );
+
+    /**
+     * Encode in Base32
+     *
+     * @param $bytes
+     * @return string
+     */
+    public static function encode( $bytes ) {
+        $i = 0; $index = 0; $digit = 0;
+        $base32 = '';
+        $bytes_len = strlen($bytes);
+        while( $i < $bytes_len ) {
+            $currByte = ord($bytes{$i});
+            /* Is the current digit going to span a byte boundary? */
+            if( $index > 3 ) {
+                if( ($i + 1) < $bytes_len ) {
+                    $nextByte = ord($bytes{$i+1});
+                } else {
+                    $nextByte = 0;
+                }
+                $digit = $currByte & (0xFF >> $index);
+                $index = ($index + 5) % 8;
+                $digit <<= $index;
+                $digit |= $nextByte >> (8 - $index);
+                $i++;
+            } else {
+                $digit = ($currByte >> (8 - ($index + 5))) & 0x1F;
+                $index = ($index + 5) % 8;
+                if( $index === 0 ) $i++;
+            }
+            $base32 .= self::$base32Chars{$digit};
+        }
+        return $base32;
+    }
+
+    /**
+     * Decode in Base32
+     *
+     * @param $base32
+     * @return string
+     */
+    public static function decode( $base32 ) {
+        $bytes = array();
+        $base32_len = strlen($base32);
+        for( $i=$base32_len*5/8-1; $i>=0; --$i ) {
+            $bytes[] = 0;
+        }
+        for( $i = 0, $index = 0, $offset = 0; $i < $base32_len; $i++ ) {
+            $lookup = ord($base32{$i}) - ord('0');
+            /* Skip chars outside the lookup table */
+            if( $lookup < 0 || $lookup >= count(self::$base32Lookup) ) {
+                continue;
+            }
+            $digit = self::$base32Lookup[$lookup];
+            /* If this digit is not in the table, ignore it */
+            if( $digit == 0xFF ) continue;
+            if( $index <= 3 ) {
+                $index = ($index + 5) % 8;
+                if( $index == 0) {
+                    $bytes[$offset] |= $digit;
+                    $offset++;
+                    if( $offset >= count($bytes) ) break;
+                } else {
+                    $bytes[$offset] |= $digit << (8 - $index);
+                }
+            } else {
+                $index = ($index + 5) % 8;
+                $bytes[$offset] |= ($digit >> $index);
+                $offset++;
+                if ($offset >= count($bytes) ) break;
+                $bytes[$offset] |= $digit << (8 - $index);
+            }
+        }
+        $bites = '';
+        foreach( $bytes as $byte ) $bites .= chr($byte);
+        return $bites;
+    }
+}