| 397 | } |
| 398 | |
| 399 | bool GetScriptOp(CScriptBase::const_iterator& pc, CScriptBase::const_iterator end, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) |
| 400 | { |
| 401 | opcodeRet = OP_INVALIDOPCODE; |
| 402 | if (pvchRet) |
| 403 | pvchRet->clear(); |
| 404 | if (pc >= end) |
| 405 | return false; |
| 406 | |
| 407 | // Read instruction |
| 408 | if (end - pc < 1) |
| 409 | return false; |
| 410 | unsigned int opcode = *pc++; |
| 411 | |
| 412 | // Immediate operand |
| 413 | if (opcode <= OP_PUSHDATA4) |
| 414 | { |
| 415 | unsigned int nSize = 0; |
| 416 | if (opcode < OP_PUSHDATA1) |
| 417 | { |
| 418 | nSize = opcode; |
| 419 | } |
| 420 | else if (opcode == OP_PUSHDATA1) |
| 421 | { |
| 422 | if (end - pc < 1) |
| 423 | return false; |
| 424 | nSize = *pc++; |
| 425 | } |
| 426 | else if (opcode == OP_PUSHDATA2) |
| 427 | { |
| 428 | if (end - pc < 2) |
| 429 | return false; |
| 430 | nSize = ReadLE16(&pc[0]); |
| 431 | pc += 2; |
| 432 | } |
| 433 | else if (opcode == OP_PUSHDATA4) |
| 434 | { |
| 435 | if (end - pc < 4) |
| 436 | return false; |
| 437 | nSize = ReadLE32(&pc[0]); |
| 438 | pc += 4; |
| 439 | } |
| 440 | if (end - pc < 0 || (unsigned int)(end - pc) < nSize) |
| 441 | return false; |
| 442 | if (pvchRet) |
| 443 | pvchRet->assign(pc, pc + nSize); |
| 444 | pc += nSize; |
| 445 | } |
| 446 | |
| 447 | opcodeRet = static_cast<opcodetype>(opcode); |
| 448 | return true; |
| 449 | } |
| 450 | |
| 451 | bool IsOpSuccess(const opcodetype& opcode) |
| 452 | { |