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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Trezor\Bridge\Codec\CallMessage; |
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use BitWasp\Trezor\Bridge\Exception\InvalidMessageException; |
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use Psr\Http\Message\StreamInterface; |
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class HexCodec |
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{ |
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/** |
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* Implement integer comparison |
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* Returns: 0 if $a === $b |
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* -1 if $a < $b |
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* +1 if $a > $b |
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* |
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* @param int $a |
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* @param int $b |
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* @return int |
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*/ |
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private function intcmp(int $a, int $b): int |
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{ |
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return ($a < $b) ? -1 : (($a > $b) ? 1 : 0); |
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} |
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private function hex2bin(StreamInterface $stream): \Protobuf\Stream |
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{ |
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$hex = $stream->getContents(); |
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if (!ctype_xdigit($hex)) { |
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throw new InvalidMessageException("Invalid hex as input"); |
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} |
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return \Protobuf\Stream::fromString(pack("H*", $hex)); |
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} |
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public function parsePayload(StreamInterface $stream): array |
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{ |
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if ($stream->getSize() < 12) { |
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throw new InvalidMessageException("Malformed data (size too small)"); |
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} |
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$stream = $this->hex2bin($stream); |
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// relies on php returning the variables in order defined in unpack string |
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list ($type, $size) = array_values(unpack('n1type/N1size', $stream->read(6))); |
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$stream->seek(6); |
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$lCmp = $this->intcmp($stream->getSize() - 6, $size); |
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if ($lCmp < 0) { |
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throw new InvalidMessageException("Malformed data (not enough data)"); |
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} else if ($lCmp > 0) { |
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throw new InvalidMessageException("Malformed data (too much data)"); |
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} |
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return [$type, \Protobuf\Stream::wrap($stream->read($size))]; |
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} |
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public function encode(int $messageType, \Protobuf\Message $protobuf): string |
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{ |
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$stream = $protobuf->toStream(); |
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return unpack( |
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'H*', |
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sprintf( |
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"%s%s", |
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pack('nN', $messageType, $stream->getSize()), |
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$stream->getContents() |
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) |
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)[1]; |
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} |
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} |
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Bit-Wasp /
trezor-bridge-client
