Evaluate a script
(stack, scriptIn, txTo, inIdx, flags=())
| 360 | |
| 361 | |
| 362 | def _EvalScript(stack, scriptIn, txTo, inIdx, flags=()): |
| 363 | """Evaluate a script |
| 364 | |
| 365 | """ |
| 366 | if len(scriptIn) > MAX_SCRIPT_SIZE: |
| 367 | raise EvalScriptError('script too large; got %d bytes; maximum %d bytes' % |
| 368 | (len(scriptIn), MAX_SCRIPT_SIZE), |
| 369 | stack=stack, |
| 370 | scriptIn=scriptIn, |
| 371 | txTo=txTo, |
| 372 | inIdx=inIdx, |
| 373 | flags=flags) |
| 374 | |
| 375 | altstack = [] |
| 376 | vfExec = [] |
| 377 | pbegincodehash = 0 |
| 378 | nOpCount = [0] |
| 379 | for (sop, sop_data, sop_pc) in scriptIn.raw_iter(): |
| 380 | fExec = _CheckExec(vfExec) |
| 381 | |
| 382 | def err_raiser(cls, *args): |
| 383 | """Helper function for raising EvalScriptError exceptions |
| 384 | |
| 385 | cls - subclass you want to raise |
| 386 | |
| 387 | *args - arguments |
| 388 | |
| 389 | Fills in the state of execution for you. |
| 390 | """ |
| 391 | raise cls(*args, |
| 392 | sop=sop, |
| 393 | sop_data=sop_data, |
| 394 | sop_pc=sop_pc, |
| 395 | stack=stack, scriptIn=scriptIn, txTo=txTo, inIdx=inIdx, flags=flags, |
| 396 | altstack=altstack, vfExec=vfExec, pbegincodehash=pbegincodehash, nOpCount=nOpCount[0]) |
| 397 | |
| 398 | |
| 399 | if sop in DISABLED_OPCODES: |
| 400 | err_raiser(EvalScriptError, 'opcode %s is disabled' % OPCODE_NAMES[sop]) |
| 401 | |
| 402 | if sop > OP_16: |
| 403 | nOpCount[0] += 1 |
| 404 | if nOpCount[0] > MAX_SCRIPT_OPCODES: |
| 405 | err_raiser(MaxOpCountError) |
| 406 | |
| 407 | def check_args(n): |
| 408 | if len(stack) < n: |
| 409 | err_raiser(MissingOpArgumentsError, sop, stack, n) |
| 410 | |
| 411 | |
| 412 | if sop <= OP_PUSHDATA4: |
| 413 | if len(sop_data) > MAX_SCRIPT_ELEMENT_SIZE: |
| 414 | err_raiser(EvalScriptError, |
| 415 | 'PUSHDATA of length %d; maximum allowed is %d' % |
| 416 | (len(sop_data), MAX_SCRIPT_ELEMENT_SIZE)) |
| 417 | |
| 418 | elif fExec: |
| 419 | stack.append(sop_data) |
no test coverage detected