%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
declare(strict_types=1);
namespace CBOR;
use CBOR\OtherObject\BreakObject;
use CBOR\OtherObject\DoublePrecisionFloatObject;
use CBOR\OtherObject\FalseObject;
use CBOR\OtherObject\HalfPrecisionFloatObject;
use CBOR\OtherObject\NullObject;
use CBOR\OtherObject\OtherObjectManager;
use CBOR\OtherObject\OtherObjectManagerInterface;
use CBOR\OtherObject\SimpleObject;
use CBOR\OtherObject\SinglePrecisionFloatObject;
use CBOR\OtherObject\TrueObject;
use CBOR\OtherObject\UndefinedObject;
use CBOR\Tag\Base16EncodingTag;
use CBOR\Tag\Base64EncodingTag;
use CBOR\Tag\Base64Tag;
use CBOR\Tag\Base64UrlEncodingTag;
use CBOR\Tag\Base64UrlTag;
use CBOR\Tag\BigFloatTag;
use CBOR\Tag\CBOREncodingTag;
use CBOR\Tag\CBORTag;
use CBOR\Tag\DatetimeTag;
use CBOR\Tag\DecimalFractionTag;
use CBOR\Tag\MimeTag;
use CBOR\Tag\NegativeBigIntegerTag;
use CBOR\Tag\TagManager;
use CBOR\Tag\TagManagerInterface;
use CBOR\Tag\TimestampTag;
use CBOR\Tag\UnsignedBigIntegerTag;
use CBOR\Tag\UriTag;
use InvalidArgumentException;
use RuntimeException;
use function ord;
use const STR_PAD_LEFT;
final class Decoder implements DecoderInterface
{
private TagManagerInterface $tagObjectManager;
private OtherObjectManagerInterface $otherTypeManager;
public function __construct(
?TagManagerInterface $tagObjectManager = null,
?OtherObjectManagerInterface $otherTypeManager = null
) {
$this->tagObjectManager = $tagObjectManager ?? $this->generateTagManager();
$this->otherTypeManager = $otherTypeManager ?? $this->generateOtherObjectManager();
}
public static function create(
?TagManagerInterface $tagObjectManager = null,
?OtherObjectManagerInterface $otherTypeManager = null
): self {
return new self($tagObjectManager, $otherTypeManager);
}
public function decode(Stream $stream): CBORObject
{
return $this->process($stream, false);
}
private function process(Stream $stream, bool $breakable): CBORObject
{
$ib = ord($stream->read(1));
$mt = $ib >> 5;
$ai = $ib & 0b00011111;
$val = null;
switch ($ai) {
case CBORObject::LENGTH_1_BYTE: //24
case CBORObject::LENGTH_2_BYTES: //25
case CBORObject::LENGTH_4_BYTES: //26
case CBORObject::LENGTH_8_BYTES: //27
$val = $stream->read(2 ** ($ai & 0b00000111));
break;
case CBORObject::FUTURE_USE_1: //28
case CBORObject::FUTURE_USE_2: //29
case CBORObject::FUTURE_USE_3: //30
throw new InvalidArgumentException(sprintf(
'Cannot parse the data. Found invalid Additional Information "%s" (%d).',
str_pad(decbin($ai), 8, '0', STR_PAD_LEFT),
$ai
));
case CBORObject::LENGTH_INDEFINITE: //31
return $this->processInfinite($stream, $mt, $breakable);
}
return $this->processFinite($stream, $mt, $ai, $val);
}
private function processFinite(Stream $stream, int $mt, int $ai, ?string $val): CBORObject
{
switch ($mt) {
case CBORObject::MAJOR_TYPE_UNSIGNED_INTEGER: //0
return UnsignedIntegerObject::createObjectForValue($ai, $val);
case CBORObject::MAJOR_TYPE_NEGATIVE_INTEGER: //1
return NegativeIntegerObject::createObjectForValue($ai, $val);
case CBORObject::MAJOR_TYPE_BYTE_STRING: //2
$length = $val === null ? $ai : Utils::binToInt($val);
return ByteStringObject::create($stream->read($length));
case CBORObject::MAJOR_TYPE_TEXT_STRING: //3
$length = $val === null ? $ai : Utils::binToInt($val);
return TextStringObject::create($stream->read($length));
case CBORObject::MAJOR_TYPE_LIST: //4
$object = ListObject::create();
$nbItems = $val === null ? $ai : Utils::binToInt($val);
for ($i = 0; $i < $nbItems; ++$i) {
$object->add($this->process($stream, false));
}
return $object;
case CBORObject::MAJOR_TYPE_MAP: //5
$object = MapObject::create();
$nbItems = $val === null ? $ai : Utils::binToInt($val);
for ($i = 0; $i < $nbItems; ++$i) {
$object->add($this->process($stream, false), $this->process($stream, false));
}
return $object;
case CBORObject::MAJOR_TYPE_TAG: //6
return $this->tagObjectManager->createObjectForValue($ai, $val, $this->process($stream, false));
case CBORObject::MAJOR_TYPE_OTHER_TYPE: //7
return $this->otherTypeManager->createObjectForValue($ai, $val);
default:
throw new RuntimeException(sprintf(
'Unsupported major type "%s" (%d).',
str_pad(decbin($mt), 5, '0', STR_PAD_LEFT),
$mt
)); // Should never append
}
}
private function processInfinite(Stream $stream, int $mt, bool $breakable): CBORObject
{
switch ($mt) {
case CBORObject::MAJOR_TYPE_BYTE_STRING: //2
$object = IndefiniteLengthByteStringObject::create();
while (! ($it = $this->process($stream, true)) instanceof BreakObject) {
if (! $it instanceof ByteStringObject) {
throw new RuntimeException(
'Unable to parse the data. Infinite Byte String object can only get Byte String objects.'
);
}
$object->add($it);
}
return $object;
case CBORObject::MAJOR_TYPE_TEXT_STRING: //3
$object = IndefiniteLengthTextStringObject::create();
while (! ($it = $this->process($stream, true)) instanceof BreakObject) {
if (! $it instanceof TextStringObject) {
throw new RuntimeException(
'Unable to parse the data. Infinite Text String object can only get Text String objects.'
);
}
$object->add($it);
}
return $object;
case CBORObject::MAJOR_TYPE_LIST: //4
$object = IndefiniteLengthListObject::create();
$it = $this->process($stream, true);
while (! $it instanceof BreakObject) {
$object->add($it);
$it = $this->process($stream, true);
}
return $object;
case CBORObject::MAJOR_TYPE_MAP: //5
$object = IndefiniteLengthMapObject::create();
while (! ($it = $this->process($stream, true)) instanceof BreakObject) {
$object->add($it, $this->process($stream, false));
}
return $object;
case CBORObject::MAJOR_TYPE_OTHER_TYPE: //7
if (! $breakable) {
throw new InvalidArgumentException('Cannot parse the data. No enclosing indefinite.');
}
return BreakObject::create();
case CBORObject::MAJOR_TYPE_UNSIGNED_INTEGER: //0
case CBORObject::MAJOR_TYPE_NEGATIVE_INTEGER: //1
case CBORObject::MAJOR_TYPE_TAG: //6
default:
throw new InvalidArgumentException(sprintf(
'Cannot parse the data. Found infinite length for Major Type "%s" (%d).',
str_pad(decbin($mt), 5, '0', STR_PAD_LEFT),
$mt
));
}
}
private function generateTagManager(): TagManagerInterface
{
return TagManager::create()
->add(DatetimeTag::class)
->add(TimestampTag::class)
->add(UnsignedBigIntegerTag::class)
->add(NegativeBigIntegerTag::class)
->add(DecimalFractionTag::class)
->add(BigFloatTag::class)
->add(Base64UrlEncodingTag::class)
->add(Base64EncodingTag::class)
->add(Base16EncodingTag::class)
->add(CBOREncodingTag::class)
->add(UriTag::class)
->add(Base64UrlTag::class)
->add(Base64Tag::class)
->add(MimeTag::class)
->add(CBORTag::class)
;
}
private function generateOtherObjectManager(): OtherObjectManagerInterface
{
return OtherObjectManager::create()
->add(BreakObject::class)
->add(SimpleObject::class)
->add(FalseObject::class)
->add(TrueObject::class)
->add(NullObject::class)
->add(UndefinedObject::class)
->add(HalfPrecisionFloatObject::class)
->add(SinglePrecisionFloatObject::class)
->add(DoublePrecisionFloatObject::class)
;
}
}
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