/**
* @param $opCode
* @param ScriptStack $mainStack
* @throws \BitWasp\Bitcoin\Exceptions\ScriptStackException
* @throws \Exception
*/
public function op($opCode, ScriptStack $mainStack)
{
if ($this->opCodes->cmp($opCode, 'OP_1ADD') >= 0 && $this->opCodes->cmp($opCode, 'OP_0NOTEQUAL') <= 0) {
$this->singleValueCases($opCode, $mainStack);
} else {
if ($this->opCodes->isOp($opCode, 'OP_ADD') || $this->opCodes->isOp($opCode, 'OP_SUB') || $this->opCodes->cmp($opCode, 'OP_BOOLAND') >= 0 && $this->opCodes->cmp($opCode, 'OP_MAX') <= 0) {
$this->twoValueCases($opCode, $mainStack);
} else {
$this->threeValueCases($opCode, $mainStack);
}
}
}
/**
* Push data into the stack.
*
* @param $data
* @return $this
* @throws \Exception
*/
public function push(Buffer $data)
{
$length = $data->getSize();
$parsed = new Parser('', $this->math);
/** Note that larger integers are serialized without flipping bits - Big endian */
if ($length < $this->opcodes->getOpByName('OP_PUSHDATA1')) {
$varInt = Buffertools::numToVarInt($length);
$data = new Buffer($varInt->getBinary() . $data->getBinary(), null, $this->math);
$parsed->writeBytes($data->getSize(), $data);
} else {
if ($length <= 0xff) {
$lengthSize = 1;
} elseif ($length <= 0xffff) {
$lengthSize = 2;
} else {
$lengthSize = 4;
}
$op = $this->opcodes->getOpByName('OP_PUSHDATA' . $lengthSize);
$parsed->writeBytes(1, Buffer::int($op))->writeBytes($lengthSize, Buffer::int($length), true)->writeBytes($length, $data);
}
$this->script .= $parsed->getBuffer()->getBinary();
return $this;
}
/**
* Push data into the stack.
*
* @param $data
* @return $this
* @throws \Exception
*/
public function push(Buffer $data)
{
$length = $data->getSize();
$parsed = new Parser();
/** Note that larger integers are serialized without flipping bits - Big endian */
if ($length < $this->opcodes->getOpByName('OP_PUSHDATA1')) {
$parsed = $parsed->writeWithLength($data);
} elseif ($length <= 0xff) {
$parsed->writeInt(1, $this->opcodes->getOpByName('OP_PUSHDATA1'))->writeInt(1, $length, false)->writeBytes($length, $data);
} elseif ($length <= 0xffff) {
$parsed->writeInt(1, $this->opcodes->getOpByName('OP_PUSHDATA2'))->writeInt(2, $length, true)->writeBytes($length, $data);
} else {
$parsed->writeInt(1, $this->opcodes->getOpByName('OP_PUSHDATA4'))->writeInt(4, $length, true)->writeBytes($length, $data);
}
$this->script .= $parsed->getBuffer()->getBinary();
return $this;
}
/**
* @param $opCode
* @param ScriptStack $mainStack
* @param ScriptStack $altStack
* @throws \BitWasp\Bitcoin\Exceptions\ScriptStackException
* @throws \Exception
*/
public function op($opCode, ScriptStack $mainStack, ScriptStack $altStack)
{
$opCodes = $this->opCodes;
$opName = $this->opCodes->getOp($opCode);
$castToBool = $this->castToBool;
if ($opName == 'OP_TOALTSTACK') {
if ($mainStack->size() < 1) {
throw new \Exception('Invalid stack operation OP_TOALTSTACK');
}
$altStack->push($mainStack->pop());
return;
} else {
if ($opName == 'OP_FROMALTSTACK') {
if ($altStack->size() < 1) {
throw new \Exception('Invalid alt-stack operation OP_FROMALTSTACK');
}
$mainStack->push($altStack->pop());
return;
} else {
if ($opName == 'OP_IFDUP') {
// If top value not zero, duplicate it.
if ($mainStack->size() < 1) {
throw new \Exception('Invalid stack operation OP_IFDUP');
}
$vch = $mainStack->top(-1);
if ($castToBool($vch)) {
$mainStack->push($vch);
}
return;
} else {
if ($opName == 'OP_DEPTH') {
$num = $mainStack->size();
$bin = Buffer::hex($this->math->decHex($num));
$mainStack->push($bin);
return;
} else {
if ($opName == 'OP_DROP') {
if ($mainStack->size() < 1) {
throw new \Exception('Invalid stack operation OP_DROP');
}
$mainStack->pop();
return;
} else {
if ($opName == 'OP_DUP') {
if ($mainStack->size() < 1) {
throw new \Exception('Invalid stack operation OP_DUP');
}
$vch = $mainStack->top(-1);
$mainStack->push($vch);
return;
} else {
if ($opName == 'OP_NIP') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_NIP');
}
$mainStack->erase(-2);
return;
} else {
if ($opName == 'OP_OVER') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_OVER');
}
$vch = $mainStack->top(-2);
$mainStack->push($vch);
return;
} else {
if (in_array($opName, ['OP_PICK', 'OP_ROLL'])) {
// cscriptnum
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_PICK');
}
$n = $mainStack->top(-1)->getInt();
$mainStack->pop();
if ($this->math->cmp($n, 0) < 0 || $this->math->cmp($n, $mainStack->size()) >= 0) {
throw new \Exception('Invalid stack operation OP_PICK');
}
$pos = $this->math->sub($this->math->sub(0, $n), 1);
$vch = $mainStack->top($pos);
if ($opCodes->isOp($opCode, 'OP_ROLL')) {
$mainStack->erase($pos);
}
$mainStack->push($vch);
return;
} else {
if ($opName == 'OP_ROT') {
if ($mainStack->size() < 3) {
throw new \Exception('Invalid stack operation OP_ROT');
}
$mainStack->swap(-3, -2);
$mainStack->swap(-2, -1);
return;
} else {
if ($opName == 'OP_SWAP') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_SWAP');
}
$mainStack->swap(-2, -1);
return;
} else {
if ($opName == 'OP_TUCK') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_TUCK');
}
$vch = $mainStack->top(-1);
$mainStack->insert($mainStack->end() - 2, $vch);
return;
} else {
if ($opName == 'OP_2DROP') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_2DROP');
}
$mainStack->pop();
$mainStack->pop();
return;
} else {
if ($opName == 'OP_2DUP') {
if ($mainStack->size() < 2) {
throw new \Exception('Invalid stack operation OP_2DUP');
}
$string1 = $mainStack->top(-2);
$string2 = $mainStack->top(-1);
$mainStack->push($string1);
$mainStack->push($string2);
return;
} else {
if ($opName == 'OP_3DUP') {
if ($mainStack->size() < 3) {
throw new \Exception('Invalid stack operation OP_3DUP');
}
$string1 = $mainStack->top(-3);
$string2 = $mainStack->top(-2);
$string3 = $mainStack->top(-1);
$mainStack->push($string1);
$mainStack->push($string2);
$mainStack->push($string3);
return;
} else {
if ($opName == 'OP_2OVER') {
if ($mainStack->size() < 4) {
throw new \Exception('Invalid stack operation OP_2OVER');
}
$string1 = $mainStack->top(-4);
$string2 = $mainStack->top(-3);
$mainStack->push($string1);
$mainStack->push($string2);
return;
} else {
if ($opName == 'OP_2ROT') {
if ($mainStack->size() < 6) {
throw new \Exception('Invalid stack operation OP_2ROT');
}
$string1 = $mainStack->top(-6);
$string2 = $mainStack->top(-5);
$mainStack->erase(-6);
$mainStack->erase(-5);
$mainStack->push($string1);
$mainStack->push($string2);
return;
} else {
if ($opName == 'OP_2SWAP') {
if ($mainStack->size() < 4) {
throw new \Exception('Invalid stack operation OP_2SWAP');
}
$mainStack->swap(-3, -1);
$mainStack->swap(-4, -2);
return;
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
throw new \Exception('Opcode not found');
}