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ShortVec
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1<?php
2
3namespace Attestto\SolanaPhpSdk\Util;
4
5class ShortVec
6{
7    /**
8     * @param $buffer
9     * @return array list($length, $size)
10     */
11    public static function decodeLength($buffer): array
12    {
13        $buffer = Buffer::from($buffer)->toArray();
14
15        $len = 0;
16        $size = 0;
17        while ($size < sizeof($buffer)) {
18            $elem = $buffer[$size];
19            $len |= ($elem & 0x7F) << ($size * 7);
20            $size++;
21            if (($elem & 0x80) == 0) {
22                break;
23            }
24        }
25        return [$len, $size];
26    }
27
28    public static function encodeLength(int $length): array
29    {
30        $elems = [];
31        $rem_len = $length;
32
33        for (;;) {
34            $elem = $rem_len & 0x7f;
35            $rem_len >>= 7;
36            if (! $rem_len) {
37                array_push($elems, $elem);
38                break;
39            }
40            $elem |= 0x80;
41            array_push($elems, $elem);
42        }
43
44        return $elems;
45    }
46}