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<?php
namespace Protobuf;
use RuntimeException;
/**
* This class contains constants and helper functions useful for dealing with
* the Protocol Buffer wire format.
*
* @author Iván Montes <drslump@pollinimini.net>
* @author Fabio B. Silva <fabio.bat.silva@gmail.com>
*/
class WireFormat
{
const WIRE_VARINT = 0;
const WIRE_FIXED64 = 1;
const WIRE_LENGTH = 2;
const WIRE_GROUP_START = 3;
const WIRE_GROUP_END = 4;
const WIRE_FIXED32 = 5;
const WIRE_UNKNOWN = -1;
const TAG_TYPE_BITS = 3;
const TAG_TYPE_MASK = 0x7;
/**
* @var array
*/
private static $wireTypeMap = [
Field::TYPE_INT32 => WireFormat::WIRE_VARINT,
Field::TYPE_INT64 => WireFormat::WIRE_VARINT,
Field::TYPE_UINT32 => WireFormat::WIRE_VARINT,
Field::TYPE_UINT64 => WireFormat::WIRE_VARINT,
Field::TYPE_SINT32 => WireFormat::WIRE_VARINT,
Field::TYPE_SINT64 => WireFormat::WIRE_VARINT,
Field::TYPE_BOOL => WireFormat::WIRE_VARINT,
Field::TYPE_ENUM => WireFormat::WIRE_VARINT,
Field::TYPE_FIXED64 => WireFormat::WIRE_FIXED64,
Field::TYPE_SFIXED64 => WireFormat::WIRE_FIXED64,
Field::TYPE_DOUBLE => WireFormat::WIRE_FIXED64,
Field::TYPE_STRING => WireFormat::WIRE_LENGTH,
Field::TYPE_BYTES => WireFormat::WIRE_LENGTH,
Field::TYPE_MESSAGE => WireFormat::WIRE_LENGTH,
Field::TYPE_FIXED32 => WireFormat::WIRE_FIXED32,
Field::TYPE_SFIXED32 => WireFormat::WIRE_FIXED32,
Field::TYPE_FLOAT => WireFormat::WIRE_FIXED32,
];
/**
* Given a field type, determines the wire type.
*
* @param integer $type
* @param integer $default
*
* @return integer
*/
public static function getWireType($type, $default)
{
// Unknown types just return the reported wire type
return isset(self::$wireTypeMap[$type])
? self::$wireTypeMap[$type]
: $default;
}
/**
* Assert the wire type match
*
* @param integer $wire
* @param integer $type
*/
public static function assertWireType($wire, $type)
{
$expected = WireFormat::getWireType($type, $wire);
if ($wire !== $expected) {
throw new RuntimeException(sprintf(
"Expected wire type %s but got %s for type %s.",
$expected,
$wire,
$type
));
}
}
/**
* Given a tag value, determines the field number (the upper 29 bits).
*
* @param integer $tag
*
* @return integer
*/
public static function getTagFieldNumber($tag)
{
return $tag >> self::TAG_TYPE_BITS;
}
/**
* Given a tag value, determines the wire type (the lower 3 bits).
*
* @param integer $tag
*
* @return integer
*/
public static function getTagWireType($tag)
{
return $tag & self::TAG_TYPE_MASK;
}
/**
* Makes a tag value given a field number and wire type
*
* @param integer $tag
* @param integer $wireType
*
* @return integer
*/
public static function getFieldKey($tag, $wireType)
{
return ($tag << self::TAG_TYPE_BITS) | $wireType;
}
}