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<?php |
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namespace BitWasp\Buffertools; |
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class Buffertools |
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{ |
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/** |
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* @param int $decimal |
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* @return string |
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* @throws \Exception |
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*/ |
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public static function numToVarIntBin($decimal) |
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{ |
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if ($decimal < 0xfd) { |
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$bin = chr($decimal); |
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} elseif ($decimal <= 0xffff) { |
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// Uint16 |
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$bin = pack("Cv", 0xfd, $decimal); |
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} elseif ($decimal <= 0xffffffff) { |
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// Uint32 |
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$bin = pack("CV", 0xfe, $decimal); |
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} else { |
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// Todo, support for 64bit integers |
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throw new \Exception('numToVarInt(): Integer too large'); |
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} |
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return $bin; |
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} |
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/** |
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* Convert a decimal number into a VarInt Buffer |
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* |
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* @param integer $decimal |
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* @return Buffer |
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* @throws \Exception |
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*/ |
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public static function numToVarInt($decimal) |
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{ |
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return new Buffer(static::numToVarIntBin($decimal)); |
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} |
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/** |
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* Flip byte order of this binary string. Accepts a string or Buffer, |
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* and will return whatever type it was given. |
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* |
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* @param string|BufferInterface $bytes |
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* @return string|BufferInterface |
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*/ |
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public static function flipBytes($bytes) |
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{ |
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$isBuffer = $bytes instanceof BufferInterface; |
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if ($isBuffer) { |
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$bytes = $bytes->getBinary(); |
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} |
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$flipped = implode('', array_reverse(str_split($bytes, 1))); |
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if ($isBuffer) { |
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$flipped = new Buffer($flipped); |
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} |
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return $flipped; |
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} |
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/** |
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* @param BufferInterface $buffer1 |
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* @param BufferInterface $buffer2 |
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* @param int $size |
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* @return BufferInterface |
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*/ |
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public static function concat(BufferInterface $buffer1, BufferInterface $buffer2, $size = null) |
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{ |
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return new Buffer($buffer1->getBinary() . $buffer2->getBinary(), $size); |
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} |
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/** |
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* What if we don't have two buffers, or want to guard the types of the |
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* sorting algorithm? |
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* |
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* The default behaviour should be, take a list of Buffers/SerializableInterfaces, and |
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* sort their binary representation. |
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* |
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* If an anonymous function is provided, we completely defer the conversion of values to |
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* Buffer to the $convertToBuffer callable. |
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* |
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* This is to allow anonymous functions which are responsible for converting the item to a buffer, |
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* and which optionally type-hint the items in the array. |
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* |
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* @param array $items |
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* @param callable $convertToBuffer |
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* @return array |
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*/ |
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public static function sort(array $items, callable $convertToBuffer = null) |
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{ |
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if (null == $convertToBuffer) { |
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$convertToBuffer = function ($value) { |
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if ($value instanceof BufferInterface) { |
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return $value; |
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} |
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if ($value instanceof SerializableInterface) { |
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return $value->getBuffer(); |
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} |
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throw new \RuntimeException('Requested to sort unknown type'); |
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}; |
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} |
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usort($items, function ($a, $b) use ($convertToBuffer) { |
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$av = $convertToBuffer($a)->getBinary(); |
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$bv = $convertToBuffer($b)->getBinary(); |
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return $av == $bv ? 0 : $av > $bv ? 1 : -1; |
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}); |
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return $items; |
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} |
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} |
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Bit-Wasp /
buffertools-php
