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<?php
namespace Protobuf\Binary;
use Protobuf\Binary\Platform\BigEndian;
use Protobuf\MessageInterface;
use Protobuf\Configuration;
use Protobuf\WireFormat;
use Protobuf\Unknown;
use Protobuf\Stream;
/**
* Compute the number of bytes that would be needed to encode a value
*
* @author Fabio B. Silva <fabio.bat.silva@gmail.com>
*/
class SizeCalculator
{
/**
* @var \Protobuf\Configuration
*/
protected $config;
/**
* Constructor
*
* @param \Protobuf\Configuration $config
*/
public function __construct(Configuration $config)
{
$this->config = $config;
}
/**
* Compute the number of bytes that would be needed to encode a varint.
*
* @param integer $value
*
* @return integer
*/
public function computeVarintSize($value)
{
if (($value & (0xffffffff << 7)) === 0) {
return 1;
}
if (($value & (0xffffffff << 14)) === 0) {
return 2;
}
if (($value & (0xffffffff << 21)) === 0) {
return 3;
}
if (($value & (0xffffffff << 28)) === 0) {
return 4;
}
if (($value & (0xffffffff << 35)) === 0) {
return 5;
}
if (($value & (0xffffffff << 42)) === 0) {
return 6;
}
if (($value & (0xffffffff << 49)) === 0) {
return 7;
}
if (($value & (0xffffffff << 56)) === 0) {
return 8;
}
if (($value & (0xffffffff << 63)) === 0) {
return 9;
}
return 10;
}
/**
* Compute the number of bytes that would be needed to encode a zigzag 32.
*
* @param integer $value
*
* @return integer
*/
public function computeZigzag32Size($value)
{
$varint = ($value << 1) ^ ($value >> 32 - 1);
$size = $this->computeVarintSize($varint);
return $size;
}
/**
* Compute the number of bytes that would be needed to encode a zigzag 64.
*
* @param integer $value
*
* @return integer
*/
public function computeZigzag64Size($value)
{
$varint = ($value << 1) ^ ($value >> 64 - 1);
$size = $this->computeVarintSize($varint);
return $size;
}
/**
* Compute the number of bytes that would be needed to encode a string.
*
* @param integer $value
*
* @return integer
*/
public function computeStringSize($value)
{
$length = mb_strlen($value, '8bit');
$size = $length + $this->computeVarintSize($length);
return $size;
}
/**
* Compute the number of bytes that would be needed to encode a stream of bytes.
*
* @param \Protobuf\Stream $value
*
* @return integer
*/
public function computeByteStreamSize(Stream $value)
{
$length = $value->getSize();
$size = $length + $this->computeVarintSize($length);
return $size;
}
/**
* Compute the number of bytes that would be needed to encode a sFixed32.
*
* @return integer
*/
public function computeSFixed32Size()
{
return 4;
}
/**
* Compute the number of bytes that would be needed to encode a fixed32.
*
* @return integer
*/
public function computeFixed32Size()
{
return 4;
}
/**
* Compute the number of bytes that would be needed to encode a sFixed64.
*
* @return integer
*/
public function computeSFixed64Size()
{
return 8;
}
/**
* Compute the number of bytes that would be needed to encode a fixed64.
*
*
* @return integer
*/
public function computeFixed64Size()
{
return 8;
}
/**
* Compute the number of bytes that would be needed to encode a float.
*
* @return integer
*/
public function computeFloatSize()
{
return 4;
}
/**
* Compute the number of bytes that would be needed to encode a double.
*
* @return integer
*/
public function computeDoubleSize()
{
return 8;
}
/**
* Compute the number of bytes that would be needed to encode a bool.
*
* @return integer
*/
public function computeBoolSize()
{
return 1;
}
}