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Removed unused Base32 class

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netkas 2025-01-06 02:29:33 -05:00
parent 3d915f55a5
commit fa188fb27f
1 changed files with 0 additions and 114 deletions
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114
src/Socialbox/Classes/Base32.php
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@ -1,114 +0,0 @@
<?php
namespace Socialbox\Classes;
use InvalidArgumentException;
class Base32
{
/**
* Array with all 32 characters for decoding from/encoding to base32.
*/
private const LOOKUP_TABLE = [
'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
];
/**
* Allowed padding lengths for base32 data.
*/
private const ALLOWED_PADDING = [6, 4, 3, 1, 0];
/**
* Decodes base32 data.
*
* @param string $data
* @return string
* @throws InvalidArgumentException
*/
public static function decode(string $data): string
{
if (empty($data))
{
throw new InvalidArgumentException('No data provided to decode');
}
$chars = self::LOOKUP_TABLE;
$chars_flipped = array_flip($chars);
$char_count = substr_count($data, $chars[32]);
if (!in_array($char_count, self::ALLOWED_PADDING, true))
{
throw new InvalidArgumentException(sprintf('Invalid padding in the base32 data: %s', $data));
}
for ($i = 0; $i < 4; ++$i)
{
if ($char_count === self::ALLOWED_PADDING[$i] &&
substr($data, -self::ALLOWED_PADDING[$i]) !== str_repeat($chars[32], self::ALLOWED_PADDING[$i]))
{
throw new InvalidArgumentException(sprintf('Invalid padding in the base32 data: %s', $data));
}
}
// Remove padding characters
$data = str_replace('=', (string)null, $data);
$data = str_split($data);
$binary_string = (string)null;
for ($i = 0, $data_count = count($data); $i < $data_count; $i += 8)
{
$x = (string)null;
for ($j = 0; $j < 8; ++$j)
{
$char = $data[$i + $j] ?? null;
if ($char === null || !isset($chars_flipped[$char]))
{
throw new InvalidArgumentException(sprintf('Invalid character in the base32 data: %s', $char));
}
$x .= str_pad(base_convert((string)$chars_flipped[$char], 10, 2), 5, '0', STR_PAD_LEFT);
}
$eight_bits = str_split($x, 8);
foreach ($eight_bits as $bits)
{
$binary_string .= ($y = chr((int)base_convert($bits, 2, 10))) !== false ? $y : (string)null;
}
}
return $binary_string;
}
public static function encode(string $data): string
{
$binaryLength = strlen($data);
$base32String = '';
$buffer = 0;
$bitsLeft = 0;
for ($i = 0; $i < $binaryLength; $i++)
{
$buffer = ($buffer << 8) | (ord($data[$i]) & 0xFF);
$bitsLeft += 8;
while ($bitsLeft >= 5)
{
$base32String .= self::LOOKUP_TABLE[($buffer >> ($bitsLeft - 5)) & 0x1F];
$bitsLeft -= 5;
}
}
if ($bitsLeft > 0)
{
$base32String .= self::LOOKUP_TABLE[($buffer << (5 - $bitsLeft)) & 0x1F];
}
return $base32String;
}
}