mirror of https://github.com/mashirozx/sakura.git
218 lines
6.3 KiB
PHP
218 lines
6.3 KiB
PHP
<?php
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/**
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* SCSSPHP
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*
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* @copyright 2012-2018 Leaf Corcoran
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*
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* @license http://opensource.org/licenses/MIT MIT
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*
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* @link http://leafo.github.io/scssphp
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*/
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namespace Leafo\ScssPhp\SourceMap;
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/**
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* Base64 VLQ Encoder
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*
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* {@internal Derivative of oyejorge/less.php's lib/SourceMap/Base64VLQ.php, relicensed with permission. }}
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*
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* @author Josh Schmidt <oyejorge@gmail.com>
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* @author Nicolas FRANÇOIS <nicolas.francois@frog-labs.com>
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*/
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class Base64VLQEncoder
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{
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/**
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* Shift
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*
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* @var integer
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*/
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private $shift = 5;
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/**
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* Mask
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*
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* @var integer
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*/
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private $mask = 0x1F; // == (1 << shift) == 0b00011111
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/**
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* Continuation bit
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*
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* @var integer
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*/
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private $continuationBit = 0x20; // == (mask - 1 ) == 0b00100000
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/**
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* Char to integer map
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*
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* @var array
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*/
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private $charToIntMap = array(
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'A' => 0, 'B' => 1, 'C' => 2, 'D' => 3, 'E' => 4, 'F' => 5, 'G' => 6, 'H' => 7,
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'I' => 8, 'J' => 9, 'K' => 10, 'L' => 11, 'M' => 12, 'N' => 13, 'O' => 14, 'P' => 15,
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'Q' => 16, 'R' => 17, 'S' => 18, 'T' => 19, 'U' => 20, 'V' => 21, 'W' => 22, 'X' => 23,
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'Y' => 24, 'Z' => 25, 'a' => 26, 'b' => 27, 'c' => 28, 'd' => 29, 'e' => 30, 'f' => 31,
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'g' => 32, 'h' => 33, 'i' => 34, 'j' => 35, 'k' => 36, 'l' => 37, 'm' => 38, 'n' => 39,
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'o' => 40, 'p' => 41, 'q' => 42, 'r' => 43, 's' => 44, 't' => 45, 'u' => 46, 'v' => 47,
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'w' => 48, 'x' => 49, 'y' => 50, 'z' => 51, 0 => 52, 1 => 53, 2 => 54, 3 => 55,
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4 => 56, 5 => 57, 6 => 58, 7 => 59, 8 => 60, 9 => 61, '+' => 62, '/' => 63,
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);
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/**
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* Integer to char map
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*
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* @var array
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*/
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private $intToCharMap = array(
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0 => 'A', 1 => 'B', 2 => 'C', 3 => 'D', 4 => 'E', 5 => 'F', 6 => 'G', 7 => 'H',
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8 => 'I', 9 => 'J', 10 => 'K', 11 => 'L', 12 => 'M', 13 => 'N', 14 => 'O', 15 => 'P',
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16 => 'Q', 17 => 'R', 18 => 'S', 19 => 'T', 20 => 'U', 21 => 'V', 22 => 'W', 23 => 'X',
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24 => 'Y', 25 => 'Z', 26 => 'a', 27 => 'b', 28 => 'c', 29 => 'd', 30 => 'e', 31 => 'f',
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32 => 'g', 33 => 'h', 34 => 'i', 35 => 'j', 36 => 'k', 37 => 'l', 38 => 'm', 39 => 'n',
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40 => 'o', 41 => 'p', 42 => 'q', 43 => 'r', 44 => 's', 45 => 't', 46 => 'u', 47 => 'v',
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48 => 'w', 49 => 'x', 50 => 'y', 51 => 'z', 52 => '0', 53 => '1', 54 => '2', 55 => '3',
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56 => '4', 57 => '5', 58 => '6', 59 => '7', 60 => '8', 61 => '9', 62 => '+', 63 => '/',
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);
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/**
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* Constructor
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*/
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public function __construct()
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{
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// I leave it here for future reference
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// foreach (str_split('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/') as $i => $char)
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// {
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// $this->charToIntMap[$char] = $i;
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// $this->intToCharMap[$i] = $char;
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// }
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}
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/**
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* Convert from a two-complement value to a value where the sign bit is
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* is placed in the least significant bit. For example, as decimals:
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* 1 becomes 2 (10 binary), -1 becomes 3 (11 binary)
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* 2 becomes 4 (100 binary), -2 becomes 5 (101 binary)
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* We generate the value for 32 bit machines, hence -2147483648 becomes 1, not 4294967297,
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* even on a 64 bit machine.
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*
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* @param string $aValue
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*/
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public function toVLQSigned($aValue)
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{
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return 0xffffffff & ($aValue < 0 ? ((-$aValue) << 1) + 1 : ($aValue << 1) + 0);
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}
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/**
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* Convert to a two-complement value from a value where the sign bit is
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* is placed in the least significant bit. For example, as decimals:
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* 2 (10 binary) becomes 1, 3 (11 binary) becomes -1
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* 4 (100 binary) becomes 2, 5 (101 binary) becomes -2
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* We assume that the value was generated with a 32 bit machine in mind.
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* Hence
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* 1 becomes -2147483648
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* even on a 64 bit machine.
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*
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* @param integer $aValue
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*/
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public function fromVLQSigned($aValue)
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{
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return $aValue & 1 ? $this->zeroFill(~$aValue + 2, 1) | (-1 - 0x7fffffff) : $this->zeroFill($aValue, 1);
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}
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/**
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* Return the base 64 VLQ encoded value.
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*
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* @param string $aValue The value to encode
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*
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* @return string The encoded value
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*/
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public function encode($aValue)
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{
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$encoded = '';
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$vlq = $this->toVLQSigned($aValue);
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do {
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$digit = $vlq & $this->mask;
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$vlq = $this->zeroFill($vlq, $this->shift);
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if ($vlq > 0) {
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$digit |= $this->continuationBit;
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}
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$encoded .= $this->base64Encode($digit);
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} while ($vlq > 0);
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return $encoded;
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}
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/**
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* Return the value decoded from base 64 VLQ.
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*
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* @param string $encoded The encoded value to decode
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*
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* @return integer The decoded value
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*/
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public function decode($encoded)
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{
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$vlq = 0;
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$i = 0;
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do {
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$digit = $this->base64Decode($encoded[$i]);
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$vlq |= ($digit & $this->mask) << ($i * $this->shift);
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$i++;
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} while ($digit & $this->continuationBit);
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return $this->fromVLQSigned($vlq);
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}
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/**
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* Right shift with zero fill.
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*
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* @param integer $a number to shift
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* @param integer $b number of bits to shift
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*
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* @return integer
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*/
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public function zeroFill($a, $b)
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{
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return ($a >= 0) ? ($a >> $b) : ($a >> $b) & (PHP_INT_MAX >> ($b - 1));
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}
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/**
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* Encode single 6-bit digit as base64.
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*
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* @param integer $number
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*
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* @return string
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*
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* @throws \Exception If the number is invalid
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*/
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public function base64Encode($number)
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{
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if ($number < 0 || $number > 63) {
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throw new \Exception(sprintf('Invalid number "%s" given. Must be between 0 and 63.', $number));
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}
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return $this->intToCharMap[$number];
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}
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/**
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* Decode single 6-bit digit from base64
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*
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* @param string $char
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*
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* @return integer
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*
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* @throws \Exception If the number is invalid
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*/
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public function base64Decode($char)
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{
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if (! array_key_exists($char, $this->charToIntMap)) {
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throw new \Exception(sprintf('Invalid base 64 digit "%s" given.', $char));
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}
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return $this->charToIntMap[$char];
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}
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}
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