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WitnessProgram.php
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WitnessProgram.php
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<?php
declare
(strict_types=
1
);
namespace
BitWasp
\
Bitcoin
\
Script
;
use
BitWasp
\
Buffertools
\
BufferInterface
;
class
WitnessProgram
{
const
V0
=
0
;
/**
* @var int
*/
private
$
version
;
/**
* @var BufferInterface
*/
private
$
program
;
/**
* @var ScriptInterface|null
*/
private
$
outputScript
;
/**
* WitnessProgram constructor.
* @param int $version
* @param BufferInterface $program
*/
public
function
__construct
(
int
$
version
,
BufferInterface
$
program
)
{
if
(
$
this
->
version
<
0
||
$
this
->
version
>
16
) {
throw
new
\
RuntimeException
(
"
Invalid witness program version
"
);
}
if
(
$
this
->
version
===
0
&& (
$
program
->
getSize
() !==
20
&&
$
program
->
getSize
() !==
32
)) {
throw
new
\
RuntimeException
(
'
Invalid size for V0 witness program - must be 20 or 32 bytes
'
);
}
$
this
->
version
=
$
version
;
$
this
->
program
=
$
program
;
}
/**
* @param BufferInterface $program
* @return WitnessProgram
*/
public
static
function
v0
(
BufferInterface
$
program
):
WitnessProgram
{
if
(
$
program
->
getSize
() ===
20
) {
return
new
self
(
self
::
V0
,
$
program
);
}
else
if
(
$
program
->
getSize
() ===
32
) {
return
new
self
(
self
::
V0
,
$
program
);
}
else
{
throw
new
\
RuntimeException
(
'
Invalid size for V0 witness program - must be 20 or 32 bytes
'
);
}
}
/**
* @return int
*/
public
function
getVersion
():
int
{
return
$
this
->
version
;
}
/**
* @return BufferInterface
*/
public
function
getProgram
():
BufferInterface
{
return
$
this
->
program
;
}
/**
* @return ScriptInterface
*/
public
function
getScript
():
ScriptInterface
{
if
(
null
===
$
this
->
outputScript
) {
$
this
->
outputScript
= ScriptFactory::
sequence
([
encodeOpN
(
$
this
->
version
),
$
this
->
program
]);
}
return
$
this
->
outputScript
;
}
}
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