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Add varint length checks (10 bytes, currently no proper varlong support)

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This commit is contained in:
Dylan K. Taylor 2016-10-21 14:07:00 +01:00
parent 2ffbb452bb
commit 2dfca14714
1 changed files with 10 additions and 2 deletions
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12
src/pocketmine/utils/Binary.php
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@ -436,12 +436,12 @@ class Binary{
return self::readLong(strrev($str));
}
//TODO: varlong, varint length checks
public static function writeLLong($value){
return strrev(self::writeLong($value));
}
//TODO: proper varlong support
public static function readVarInt($stream){
$shift = PHP_INT_SIZE === 8 ? 63 : 31;
$raw = self::readUnsignedVarInt($stream);
@ -453,6 +453,9 @@ class Binary{
$value = 0;
$i = 0;
do{
if($i > 63){
throw new \InvalidArgumentException("Varint did not terminate after 10 bytes!");
}
$value |= ((($b = $stream->getByte()) & 0x7f) << $i);
$i += 7;
}while($b & 0x80);
@ -466,13 +469,18 @@ class Binary{
public static function writeUnsignedVarInt($v){
$buf = "";
$loops = 0;
do{
if($loops > 9){
throw new \InvalidArgumentException("Varint cannot be longer than 10 bytes!"); //for safety reasons
}
$w = $v & 0x7f;
if(($v >> 7) !== 0){
$w = $v | 0x80;
}
$buf .= self::writeByte($w);
$v = (($v >> 7) & (PHP_INT_MAX >> 6)); //PHP really needs a logical right-shift operator
++$loops;
}while($v);
return $buf;