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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Serializer\Block; |
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use BitWasp\Bitcoin\Block\PartialMerkleTree; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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use BitWasp\Buffertools\Template; |
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use BitWasp\Buffertools\TemplateFactory; |
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class PartialMerkleTreeSerializer |
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{ |
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/** |
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* @var \BitWasp\Buffertools\Template |
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*/ |
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private $template; |
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/** |
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* PartialMerkleTreeSerializer constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->template = $this->getTemplate(); |
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} |
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/** |
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* @return Template |
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*/ |
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public function getTemplate(): Template |
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{ |
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return (new TemplateFactory()) |
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->uint32le() |
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->vector(function (Parser $parser) { |
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return $parser->readBytes(32); |
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}) |
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->vector(function (Parser $parser) { |
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return $parser->readBytes(1); |
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}) |
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->getTemplate(); |
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} |
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/** |
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* @param int $last |
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* @param BufferInterface[] $vBytes |
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* @return array |
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*/ |
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private function buffersToBitArray($last, array $vBytes): array |
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{ |
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$size = count($vBytes) * 8; |
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$vBits = []; |
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for ($p = 0; $p < $size; $p++) { |
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$byteIndex = (int)floor($p / 8); |
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$byte = ord($vBytes[$byteIndex]->getBinary()); |
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$vBits[$p] = (int) (($byte & (1 << ($p % 8))) !== 0); |
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} |
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return array_slice($vBits, 0, $last); |
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} |
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/** |
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* @param Parser $parser |
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* @return PartialMerkleTree |
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*/ |
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public function fromParser(Parser $parser): PartialMerkleTree |
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{ |
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list ($txCount, $vHash, $vBits) = $this->template->parse($parser); |
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return new PartialMerkleTree( |
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(int)$txCount, |
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$vHash, |
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$this->buffersToBitArray($txCount, $vBits) |
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); |
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} |
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/** |
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* @param BufferInterface $buffer |
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* @return PartialMerkleTree |
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*/ |
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public function parse(BufferInterface $buffer): PartialMerkleTree |
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{ |
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return $this->fromParser(new Parser($buffer)); |
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} |
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/** |
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* @param array $bits |
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* @return array |
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*/ |
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private function bitsToBuffers(array $bits): array |
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{ |
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$vBuffers = str_split(str_pad('', (int)((count($bits)+7)/8), '0', STR_PAD_LEFT)); |
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$nBits = count($bits); |
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for ($p = 0; $p < $nBits; $p++) { |
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$index = (int)floor($p / 8); |
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$vBuffers[$index] |= $bits[$p] << ($p % 8); |
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} |
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foreach ($vBuffers as &$value) { |
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$value = Buffer::int($value); |
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} |
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unset($value); |
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return $vBuffers; |
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} |
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/** |
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* @param PartialMerkleTree $tree |
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* @return BufferInterface |
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*/ |
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public function serialize(PartialMerkleTree $tree): BufferInterface |
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{ |
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return $this->template->write([ |
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$tree->getTxCount(), |
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$tree->getHashes(), |
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$this->bitsToBuffers($tree->getFlagBits()) |
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]); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
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