42 lines
1,012 B
PHP
42 lines
1,012 B
PHP
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<?php
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namespace Misuzu;
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class Base32 {
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public const CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
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public static function decode(string $str): string {
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$out = '';
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$length = strlen($str);
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$char = $shift = 0;
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for($i = 0; $i < $length; $i++) {
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$char <<= 5;
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$char += stripos(self::CHARS, $str[$i]);
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$shift = ($shift + 5) % 8;
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$out .= $shift < 5 ? chr(($char & (0xFF << $shift)) >> $shift) : '';
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}
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return $out;
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}
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public static function encode(string $data): string {
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$bin = '';
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$encoded = '';
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$length = strlen($data);
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for($i = 0; $i < $length; $i++) {
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$bin .= sprintf('%08b', ord($data[$i]));
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}
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$bin = str_split($bin, 5);
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$last = array_pop($bin);
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$bin[] = str_pad($last, 5, '0', STR_PAD_RIGHT);
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foreach($bin as $part) {
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$encoded .= self::CHARS[bindec($part)];
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}
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return $encoded;
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}
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}
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