hashbro
67 lines
1.7 KiB
PHP
67 lines
1.7 KiB
PHP
<?php
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namespace App\Services\Chain;
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/**
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* Minimal RLP encoder for legacy Ethereum transactions.
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*/
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final class EthRlp
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{
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/**
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* @param list<string|list<mixed>> $list binary strings or nested lists
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*/
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public static function encodeList(array $list): string
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{
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$payload = '';
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foreach ($list as $item) {
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$payload .= is_array($item) ? self::encodeList($item) : self::encodeString($item);
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}
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return self::encodeLength(strlen($payload), 0xc0).$payload;
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}
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public static function encodeString(string $input): string
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{
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$len = strlen($input);
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if ($len === 1 && ord($input) < 0x80) {
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return $input;
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}
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return self::encodeLength($len, 0x80).$input;
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}
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/** Integer → minimal big-endian binary (empty for zero). */
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public static function intToBin(string|int $value): string
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{
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if (is_int($value)) {
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$value = (string) $value;
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}
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if (! preg_match('/^\d+$/', $value)) {
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throw new \InvalidArgumentException('Invalid integer');
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}
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if (bccomp($value, '0') === 0) {
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return '';
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}
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$hex = gmp_strval(gmp_init($value, 10), 16);
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if (strlen($hex) % 2 !== 0) {
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$hex = '0'.$hex;
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}
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return hex2bin($hex) ?: '';
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}
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private static function encodeLength(int $len, int $offset): string
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{
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if ($len < 56) {
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return chr($len + $offset);
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}
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$hex = dechex($len);
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if (strlen($hex) % 2 !== 0) {
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$hex = '0'.$hex;
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}
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$bin = hex2bin($hex) ?: '';
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return chr(strlen($bin) + $offset + 55).$bin;
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}
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}
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