<?php

declare (strict_types=1);
namespace PostSMTP\Vendor\ParagonIE\ConstantTime;

use InvalidArgumentException;
use RangeException;
use TypeError;
/**
 *  Copyright (c) 2016 - 2022 Paragon Initiative Enterprises.
 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all
 *  copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *  SOFTWARE.
 */
/**
 * Class Base64
 * [A-Z][a-z][0-9]+/
 *
 * @package ParagonIE\ConstantTime
 */
abstract class Base64 implements \PostSMTP\Vendor\ParagonIE\ConstantTime\EncoderInterface
{
    /**
     * Encode into Base64
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $binString
     * @return string
     *
     * @throws TypeError
     */
    public static function encode(string $binString) : string
    {
        return static::doEncode($binString, \true);
    }
    /**
     * Encode into Base64, no = padding
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $src
     * @return string
     *
     * @throws TypeError
     */
    public static function encodeUnpadded(string $src) : string
    {
        return static::doEncode($src, \false);
    }
    /**
     * @param string $src
     * @param bool $pad   Include = padding?
     * @return string
     *
     * @throws TypeError
     */
    protected static function doEncode(string $src, bool $pad = \true) : string
    {
        $dest = '';
        $srcLen = \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeStrlen($src);
        // Main loop (no padding):
        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
            /** @var array<int, int> $chunk */
            $chunk = \unpack('C*', \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeSubstr($src, $i, 3));
            $b0 = $chunk[1];
            $b1 = $chunk[2];
            $b2 = $chunk[3];
            $dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . static::encode6Bits(($b1 << 2 | $b2 >> 6) & 63) . static::encode6Bits($b2 & 63);
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = \unpack('C*', \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeSubstr($src, $i, $srcLen - $i));
            $b0 = $chunk[1];
            if ($i + 1 < $srcLen) {
                $b1 = $chunk[2];
                $dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits(($b0 << 4 | $b1 >> 4) & 63) . static::encode6Bits($b1 << 2 & 63);
                if ($pad) {
                    $dest .= '=';
                }
            } else {
                $dest .= static::encode6Bits($b0 >> 2) . static::encode6Bits($b0 << 4 & 63);
                if ($pad) {
                    $dest .= '==';
                }
            }
        }
        return $dest;
    }
    /**
     * decode from base64 into binary
     *
     * Base64 character set "./[A-Z][a-z][0-9]"
     *
     * @param string $encodedString
     * @param bool $strictPadding
     * @return string
     *
     * @throws RangeException
     * @throws TypeError
     * @psalm-suppress RedundantCondition
     */
    public static function decode(string $encodedString, bool $strictPadding = \false) : string
    {
        // Remove padding
        $srcLen = \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeStrlen($encodedString);
        if ($srcLen === 0) {
            return '';
        }
        if ($strictPadding) {
            if (($srcLen & 3) === 0) {
                if ($encodedString[$srcLen - 1] === '=') {
                    $srcLen--;
                    if ($encodedString[$srcLen - 1] === '=') {
                        $srcLen--;
                    }
                }
            }
            if (($srcLen & 3) === 1) {
                throw new \RangeException('Incorrect padding');
            }
            if ($encodedString[$srcLen - 1] === '=') {
                throw new \RangeException('Incorrect padding');
            }
        } else {
            $encodedString = \rtrim($encodedString, '=');
            $srcLen = \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeStrlen($encodedString);
        }
        $err = 0;
        $dest = '';
        // Main loop (no padding):
        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
            /** @var array<int, int> $chunk */
            $chunk = \unpack('C*', \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeSubstr($encodedString, $i, 4));
            $c0 = static::decode6Bits($chunk[1]);
            $c1 = static::decode6Bits($chunk[2]);
            $c2 = static::decode6Bits($chunk[3]);
            $c3 = static::decode6Bits($chunk[4]);
            $dest .= \pack('CCC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff, ($c2 << 6 | $c3) & 0xff);
            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = \unpack('C*', \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeSubstr($encodedString, $i, $srcLen - $i));
            $c0 = static::decode6Bits($chunk[1]);
            if ($i + 2 < $srcLen) {
                $c1 = static::decode6Bits($chunk[2]);
                $c2 = static::decode6Bits($chunk[3]);
                $dest .= \pack('CC', ($c0 << 2 | $c1 >> 4) & 0xff, ($c1 << 4 | $c2 >> 2) & 0xff);
                $err |= ($c0 | $c1 | $c2) >> 8;
                if ($strictPadding) {
                    $err |= $c2 << 6 & 0xff;
                }
            } elseif ($i + 1 < $srcLen) {
                $c1 = static::decode6Bits($chunk[2]);
                $dest .= \pack('C', ($c0 << 2 | $c1 >> 4) & 0xff);
                $err |= ($c0 | $c1) >> 8;
                if ($strictPadding) {
                    $err |= $c1 << 4 & 0xff;
                }
            } elseif ($strictPadding) {
                $err |= 1;
            }
        }
        $check = $err === 0;
        if (!$check) {
            throw new \RangeException('Base64::decode() only expects characters in the correct base64 alphabet');
        }
        return $dest;
    }
    /**
     * @param string $encodedString
     * @return string
     */
    public static function decodeNoPadding(string $encodedString) : string
    {
        $srcLen = \PostSMTP\Vendor\ParagonIE\ConstantTime\Binary::safeStrlen($encodedString);
        if ($srcLen === 0) {
            return '';
        }
        if (($srcLen & 3) === 0) {
            if ($encodedString[$srcLen - 1] === '=') {
                throw new \InvalidArgumentException("decodeNoPadding() doesn't tolerate padding");
            }
            if (($srcLen & 3) > 1) {
                if ($encodedString[$srcLen - 2] === '=') {
                    throw new \InvalidArgumentException("decodeNoPadding() doesn't tolerate padding");
                }
            }
        }
        return static::decode($encodedString, \true);
    }
    /**
     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
     * into 8-bit integers.
     *
     * Base64 character set:
     * [A-Z]      [a-z]      [0-9]      +     /
     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
     *
     * @param int $src
     * @return int
     */
    protected static function decode6Bits(int $src) : int
    {
        $ret = -1;
        // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
        $ret += (0x40 - $src & $src - 0x5b) >> 8 & $src - 64;
        // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
        $ret += (0x60 - $src & $src - 0x7b) >> 8 & $src - 70;
        // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
        $ret += (0x2f - $src & $src - 0x3a) >> 8 & $src + 5;
        // if ($src == 0x2b) $ret += 62 + 1;
        $ret += (0x2a - $src & $src - 0x2c) >> 8 & 63;
        // if ($src == 0x2f) ret += 63 + 1;
        $ret += (0x2e - $src & $src - 0x30) >> 8 & 64;
        return $ret;
    }
    /**
     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
     * into 6-bit integers.
     *
     * @param int $src
     * @return string
     */
    protected static function encode6Bits(int $src) : string
    {
        $diff = 0x41;
        // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
        $diff += 25 - $src >> 8 & 6;
        // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
        $diff -= 51 - $src >> 8 & 75;
        // if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
        $diff -= 61 - $src >> 8 & 15;
        // if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
        $diff += 62 - $src >> 8 & 3;
        return \pack('C', $src + $diff);
    }
}
