cpython/Objects/bytearrayobject.c at ModuleNotFoundError-suggestions · FFY00/cpython · GitHub

History

3122 lines (2681 loc) · 90.6 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

/* PyByteArray (bytearray) implementation */

#include "Python.h"

#include "pycore_abstract.h" // _PyIndex_Check()

#include "pycore_bytes_methods.h"

#include "pycore_bytesobject.h"

#include "pycore_ceval.h" // _PyEval_GetBuiltin()

#include "pycore_critical_section.h"

#include "pycore_object.h" // _PyObject_GC_UNTRACK()

#include "pycore_strhex.h" // _Py_strhex_with_sep()

#include "pycore_long.h" // _PyLong_FromUnsignedChar()

#include "pycore_pyatomic_ft_wrappers.h"

#include "bytesobject.h"

/*[clinic input]

class bytearray "PyByteArrayObject *" "&PyByteArray_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=5535b77c37a119e0]*/

/* Max number of bytes a bytearray can contain */

#define PyByteArray_SIZE_MAX ((Py_ssize_t)(PY_SSIZE_T_MAX - _PyBytesObject_SIZE))

/* Helpers */

static int

_getbytevalue(PyObject* arg, int *value)

{

int overflow;

long face_value = PyLong_AsLongAndOverflow(arg, &overflow);

if (face_value == -1 && PyErr_Occurred()) {

*value = -1;

return 0;

}

if (face_value < 0 || face_value >= 256) {

/* this includes an overflow in converting to C long */

PyErr_SetString(PyExc_ValueError, "byte must be in range(0, 256)");

*value = -1;

return 0;

}

*value = face_value;

return 1;

}

static void

bytearray_reinit_from_bytes(PyByteArrayObject *self, Py_ssize_t size,

Py_ssize_t alloc) {

self->ob_bytes = self->ob_start = PyBytes_AS_STRING(self->ob_bytes_object);

Py_SET_SIZE(self, size);

FT_ATOMIC_STORE_SSIZE_RELAXED(self->ob_alloc, alloc);

}

static int

bytearray_getbuffer_lock_held(PyObject *self, Py_buffer *view, int flags)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(self);

PyByteArrayObject *obj = _PyByteArray_CAST(self);

if (view == NULL) {

PyErr_SetString(PyExc_BufferError,

"bytearray_getbuffer: view==NULL argument is obsolete");

return -1;

}

void *ptr = (void *) PyByteArray_AS_STRING(obj);

if (PyBuffer_FillInfo(view, (PyObject*)obj, ptr, Py_SIZE(obj), 0, flags) < 0) {

return -1;

}

obj->ob_exports++;

return 0;

}

static int

bytearray_getbuffer(PyObject *self, Py_buffer *view, int flags)

{

int ret;

Py_BEGIN_CRITICAL_SECTION(self);

ret = bytearray_getbuffer_lock_held(self, view, flags);

Py_END_CRITICAL_SECTION();

return ret;

}

static void

bytearray_releasebuffer(PyObject *self, Py_buffer *view)

{

Py_BEGIN_CRITICAL_SECTION(self);

PyByteArrayObject *obj = _PyByteArray_CAST(self);

obj->ob_exports--;

assert(obj->ob_exports >= 0);

Py_END_CRITICAL_SECTION();

}

typedef PyObject* (*_ba_bytes_op)(const char *buf, Py_ssize_t len,

PyObject *sub, Py_ssize_t start,

Py_ssize_t end);

static PyObject *

_bytearray_with_buffer(PyByteArrayObject *self, _ba_bytes_op op, PyObject *sub,

Py_ssize_t start, Py_ssize_t end)

{

PyObject *res;

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(self);

/* Increase exports to prevent bytearray storage from changing during op. */

self->ob_exports++;

res = op(PyByteArray_AS_STRING(self), Py_SIZE(self), sub, start, end);

self->ob_exports--;

return res;

}

static int

_canresize(PyByteArrayObject *self)

{

if (self->ob_exports > 0) {

PyErr_SetString(PyExc_BufferError,

"Existing exports of data: object cannot be re-sized");

return 0;

}

return 1;

}

#include "clinic/bytearrayobject.c.h"

/* Direct API functions */

PyObject *

PyByteArray_FromObject(PyObject *input)

{

return PyObject_CallOneArg((PyObject *)&PyByteArray_Type, input);

}

static PyObject *

_PyByteArray_FromBufferObject(PyObject *obj)

{

PyObject *result;

Py_buffer view;

if (PyObject_GetBuffer(obj, &view, PyBUF_FULL_RO) < 0) {

return NULL;

}

result = PyByteArray_FromStringAndSize(NULL, view.len);

if (result != NULL &&

PyBuffer_ToContiguous(PyByteArray_AS_STRING(result),

&view, view.len, 'C') < 0)

{

Py_CLEAR(result);

}

PyBuffer_Release(&view);

return result;

}

PyObject *

PyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)

{

PyByteArrayObject *new;

if (size < 0) {

PyErr_SetString(PyExc_SystemError,

"Negative size passed to PyByteArray_FromStringAndSize");

return NULL;

}

new = PyObject_New(PyByteArrayObject, &PyByteArray_Type);

if (new == NULL) {

return NULL;

}

/* Fill values used in bytearray_dealloc.

In an optimized build the memory isn't zeroed and ob_exports would be

uninitialized when when PyBytes_FromStringAndSize errored leading to

intermittent test failures. */

new->ob_exports = 0;

/* Optimization: size=0 bytearray should not allocate space

PyBytes_FromStringAndSize returns the empty bytes global when size=0 so

no allocation occurs. */

new->ob_bytes_object = PyBytes_FromStringAndSize(NULL, size);

if (new->ob_bytes_object == NULL) {

Py_DECREF(new);

return NULL;

}

bytearray_reinit_from_bytes(new, size, size);

if (bytes != NULL && size > 0) {

memcpy(new->ob_bytes, bytes, size);

}

return (PyObject *)new;

}

Py_ssize_t

PyByteArray_Size(PyObject *self)

{

assert(self != NULL);

assert(PyByteArray_Check(self));

return PyByteArray_GET_SIZE(self);

}

char *

PyByteArray_AsString(PyObject *self)

{

assert(self != NULL);

assert(PyByteArray_Check(self));

return PyByteArray_AS_STRING(self);

}

static int

bytearray_resize_lock_held(PyObject *self, Py_ssize_t requested_size)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(self);

PyByteArrayObject *obj = ((PyByteArrayObject *)self);

/* All computations are done unsigned to avoid integer overflows

(see issue #22335). */

size_t alloc = (size_t) obj->ob_alloc;

size_t logical_offset = (size_t) (obj->ob_start - obj->ob_bytes);

size_t size = (size_t) requested_size;

assert(self != NULL);

assert(PyByteArray_Check(self));

assert(logical_offset <= alloc);

if (requested_size < 0) {

PyErr_Format(PyExc_ValueError,

"Can only resize to positive sizes, got %zd", requested_size);

return -1;

}

if (requested_size == Py_SIZE(self)) {

return 0;

}

if (!_canresize(obj)) {

return -1;

}

if (size + logical_offset <= alloc) {

/* Current buffer is large enough to host the requested size,

decide on a strategy. */

if (size < alloc / 2) {

/* Major downsize; resize down to exact size */

alloc = size;

}

else {

/* Minor downsize; quick exit */

Py_SET_SIZE(self, size);

/* Add mid-buffer null; end provided by bytes. */

PyByteArray_AS_STRING(self)[size] = '\0'; /* Trailing null */

return 0;

}

else {

/* Need growing, decide on a strategy */

if (size <= alloc * 1.125) {

/* Moderate upsize; overallocate similar to list_resize() */

alloc = size + (size >> 3) + (size < 9 ? 3 : 6);

}

else {

/* Major upsize; resize up to exact size */

alloc = size;

}

if (alloc > PyByteArray_SIZE_MAX) {

PyErr_NoMemory();

return -1;

}

/* Re-align data to the start of the allocation. */

if (logical_offset > 0) {

/* optimization tradeoff: This is faster than a new allocation when

the number of bytes being removed in a resize is small; for large

size changes it may be better to just make a new bytes object as

_PyBytes_Resize will do a malloc + memcpy internally. */

memmove(obj->ob_bytes, obj->ob_start,

Py_MIN(requested_size, Py_SIZE(self)));

}

int ret = _PyBytes_Resize(&obj->ob_bytes_object, alloc);

if (ret == -1) {

obj->ob_bytes_object = Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);

size = alloc = 0;

}

bytearray_reinit_from_bytes(obj, size, alloc);

if (alloc != size) {

/* Add mid-buffer null; end provided by bytes. */

obj->ob_bytes[size] = '\0';

}

return ret;

}

int

PyByteArray_Resize(PyObject *self, Py_ssize_t requested_size)

{

int ret;

Py_BEGIN_CRITICAL_SECTION(self);

ret = bytearray_resize_lock_held(self, requested_size);

Py_END_CRITICAL_SECTION();

return ret;

}

PyObject *

PyByteArray_Concat(PyObject *a, PyObject *b)

{

Py_buffer va, vb;

PyByteArrayObject *result = NULL;

va.len = -1;

vb.len = -1;

if (PyObject_GetBuffer(a, &va, PyBUF_SIMPLE) != 0 ||

PyObject_GetBuffer(b, &vb, PyBUF_SIMPLE) != 0) {

PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",

Py_TYPE(b)->tp_name, Py_TYPE(a)->tp_name);

goto done;

}

if (va.len > PyByteArray_SIZE_MAX - vb.len) {

PyErr_NoMemory();

goto done;

}

result = (PyByteArrayObject *) \

PyByteArray_FromStringAndSize(NULL, va.len + vb.len);

// result->ob_bytes is NULL if result is an empty bytearray:

// if va.len + vb.len equals zero.

if (result != NULL && result->ob_bytes != NULL) {

memcpy(result->ob_bytes, va.buf, va.len);

memcpy(result->ob_bytes + va.len, vb.buf, vb.len);

}

done:

if (va.len != -1)

PyBuffer_Release(&va);

if (vb.len != -1)

PyBuffer_Release(&vb);

return (PyObject *)result;

}

/* Functions stuffed into the type object */

static Py_ssize_t

bytearray_length(PyObject *op)

{

return PyByteArray_GET_SIZE(op);

}

static PyObject *

bytearray_iconcat_lock_held(PyObject *op, PyObject *other)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

Py_buffer vo;

if (PyObject_GetBuffer(other, &vo, PyBUF_SIMPLE) != 0) {

PyErr_Format(PyExc_TypeError, "can't concat %.100s to %.100s",

Py_TYPE(other)->tp_name, Py_TYPE(self)->tp_name);

return NULL;

}

Py_ssize_t size = Py_SIZE(self);

if (size > PyByteArray_SIZE_MAX - vo.len) {

PyBuffer_Release(&vo);

return PyErr_NoMemory();

}

if (bytearray_resize_lock_held((PyObject *)self, size + vo.len) < 0) {

PyBuffer_Release(&vo);

return NULL;

}

memcpy(PyByteArray_AS_STRING(self) + size, vo.buf, vo.len);

PyBuffer_Release(&vo);

return Py_NewRef(self);

}

static PyObject *

bytearray_iconcat(PyObject *op, PyObject *other)

{

PyObject *ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_iconcat_lock_held(op, other);

Py_END_CRITICAL_SECTION();

return ret;

}

static PyObject *

bytearray_repeat_lock_held(PyObject *op, Py_ssize_t count)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

if (count < 0) {

count = 0;

}

const Py_ssize_t mysize = Py_SIZE(self);

if (count > 0 && mysize > PyByteArray_SIZE_MAX / count) {

return PyErr_NoMemory();

}

Py_ssize_t size = mysize * count;

PyByteArrayObject* result = (PyByteArrayObject *)PyByteArray_FromStringAndSize(NULL, size);

const char* buf = PyByteArray_AS_STRING(self);

if (result != NULL && size != 0) {

_PyBytes_Repeat(result->ob_bytes, size, buf, mysize);

}

return (PyObject *)result;

}

static PyObject *

bytearray_repeat(PyObject *op, Py_ssize_t count)

{

PyObject *ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_repeat_lock_held(op, count);

Py_END_CRITICAL_SECTION();

return ret;

}

static PyObject *

bytearray_irepeat_lock_held(PyObject *op, Py_ssize_t count)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

if (count < 0) {

count = 0;

}

else if (count == 1) {

return Py_NewRef(self);

}

const Py_ssize_t mysize = Py_SIZE(self);

if (count > 0 && mysize > PyByteArray_SIZE_MAX / count) {

return PyErr_NoMemory();

}

const Py_ssize_t size = mysize * count;

if (bytearray_resize_lock_held((PyObject *)self, size) < 0) {

return NULL;

}

char* buf = PyByteArray_AS_STRING(self);

_PyBytes_Repeat(buf, size, buf, mysize);

return Py_NewRef(self);

}

static PyObject *

bytearray_irepeat(PyObject *op, Py_ssize_t count)

{

PyObject *ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_irepeat_lock_held(op, count);

Py_END_CRITICAL_SECTION();

return ret;

}

static PyObject *

bytearray_getitem_lock_held(PyObject *op, Py_ssize_t i)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

if (i < 0 || i >= Py_SIZE(self)) {

PyErr_SetString(PyExc_IndexError, "bytearray index out of range");

return NULL;

}

return _PyLong_FromUnsignedChar((unsigned char)(self->ob_start[i]));

}

static PyObject *

bytearray_getitem(PyObject *op, Py_ssize_t i)

{

PyObject *ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_getitem_lock_held(op, i);

Py_END_CRITICAL_SECTION();

return ret;

}

static PyObject *

bytearray_subscript_lock_held(PyObject *op, PyObject *index)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

if (_PyIndex_Check(index)) {

Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);

if (i == -1 && PyErr_Occurred())

return NULL;

if (i < 0)

i += PyByteArray_GET_SIZE(self);

if (i < 0 || i >= Py_SIZE(self)) {

PyErr_SetString(PyExc_IndexError, "bytearray index out of range");

return NULL;

}

return _PyLong_FromUnsignedChar((unsigned char)(self->ob_start[i]));

}

else if (PySlice_Check(index)) {

Py_ssize_t start, stop, step, slicelength, i;

size_t cur;

if (PySlice_Unpack(index, &start, &stop, &step) < 0) {

return NULL;

}

slicelength = PySlice_AdjustIndices(PyByteArray_GET_SIZE(self),

&start, &stop, step);

if (slicelength <= 0)

return PyByteArray_FromStringAndSize("", 0);

else if (step == 1) {

return PyByteArray_FromStringAndSize(

PyByteArray_AS_STRING(self) + start, slicelength);

}

else {

char *source_buf = PyByteArray_AS_STRING(self);

char *result_buf;

PyObject *result;

result = PyByteArray_FromStringAndSize(NULL, slicelength);

if (result == NULL)

return NULL;

result_buf = PyByteArray_AS_STRING(result);

for (cur = start, i = 0; i < slicelength;

cur += step, i++) {

result_buf[i] = source_buf[cur];

}

return result;

}

else {

PyErr_Format(PyExc_TypeError,

"bytearray indices must be integers or slices, not %.200s",

Py_TYPE(index)->tp_name);

return NULL;

}

static PyObject *

bytearray_subscript(PyObject *op, PyObject *index)

{

PyObject *ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_subscript_lock_held(op, index);

Py_END_CRITICAL_SECTION();

return ret;

}

static int

bytearray_setslice_linear(PyByteArrayObject *self,

Py_ssize_t lo, Py_ssize_t hi,

char *bytes, Py_ssize_t bytes_len)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(self);

Py_ssize_t avail = hi - lo;

char *buf = PyByteArray_AS_STRING(self);

Py_ssize_t growth = bytes_len - avail;

int res = 0;

assert(avail >= 0);

if (growth < 0) {

if (!_canresize(self))

return -1;

if (lo == 0) {

/* Shrink the buffer by advancing its logical start */

self->ob_start -= growth;

0 lo hi old_size

| |<----avail----->|<-----tail------>|

| |<-bytes_len->|<-----tail------>|

0 new_lo new_hi new_size

}

else {

0 lo hi old_size

| |<----avail----->|<-----tomove------>|

| |<-bytes_len->|<-----tomove------>|

0 lo new_hi new_size

memmove(buf + lo + bytes_len, buf + hi,

Py_SIZE(self) - hi);

}

if (bytearray_resize_lock_held((PyObject *)self,

Py_SIZE(self) + growth) < 0) {

/* Issue #19578: Handling the memory allocation failure here is

tricky here because the bytearray object has already been

modified. Depending on growth and lo, the behaviour is

different.

If growth < 0 and lo != 0, the operation is completed, but a

MemoryError is still raised and the memory block is not

shrunk. Otherwise, the bytearray is restored in its previous

state and a MemoryError is raised. */

if (lo == 0) {

self->ob_start += growth;

return -1;

}

/* memmove() removed bytes, the bytearray object cannot be

restored in its previous state. */

Py_SET_SIZE(self, Py_SIZE(self) + growth);

res = -1;

}

buf = PyByteArray_AS_STRING(self);

}

else if (growth > 0) {

if (Py_SIZE(self) > PyByteArray_SIZE_MAX - growth) {

PyErr_NoMemory();

return -1;

}

if (bytearray_resize_lock_held((PyObject *)self,

Py_SIZE(self) + growth) < 0) {

return -1;

}

buf = PyByteArray_AS_STRING(self);

/* Make the place for the additional bytes */

0 lo hi old_size

| |<-avail->|<-----tomove------>|

| |<---bytes_len-->|<-----tomove------>|

0 lo new_hi new_size

memmove(buf + lo + bytes_len, buf + hi,

Py_SIZE(self) - lo - bytes_len);

}

if (bytes_len > 0)

memcpy(buf + lo, bytes, bytes_len);

return res;

}

static int

bytearray_setslice(PyByteArrayObject *self, Py_ssize_t lo, Py_ssize_t hi,

PyObject *values)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(self);

Py_ssize_t needed;

void *bytes;

Py_buffer vbytes;

int res = 0;

vbytes.len = -1;

if (values == (PyObject *)self) {

/* Make a copy and call this function recursively */

int err;

values = PyByteArray_FromStringAndSize(PyByteArray_AS_STRING(values),

PyByteArray_GET_SIZE(values));

if (values == NULL)

return -1;

err = bytearray_setslice(self, lo, hi, values);

Py_DECREF(values);

return err;

}

if (values == NULL) {

/* del b[lo:hi] */

bytes = NULL;

needed = 0;

}

else {

if (PyObject_GetBuffer(values, &vbytes, PyBUF_SIMPLE) != 0) {

PyErr_Format(PyExc_TypeError,

"can't set bytearray slice from %.100s",

Py_TYPE(values)->tp_name);

return -1;

}

needed = vbytes.len;

bytes = vbytes.buf;

}

if (lo < 0)

lo = 0;

if (hi < lo)

hi = lo;

if (hi > Py_SIZE(self))

hi = Py_SIZE(self);

res = bytearray_setslice_linear(self, lo, hi, bytes, needed);

if (vbytes.len != -1)

PyBuffer_Release(&vbytes);

return res;

}

static int

bytearray_setitem_lock_held(PyObject *op, Py_ssize_t i, PyObject *value)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

// GH-91153: We need to do this *before* the size check, in case value has a

// nasty __index__ method that changes the size of the bytearray:

int ival = -1;

if (value && !_getbytevalue(value, &ival)) {

return -1;

}

if (i < 0) {

i += Py_SIZE(self);

}

if (i < 0 || i >= Py_SIZE(self)) {

PyErr_SetString(PyExc_IndexError, "bytearray index out of range");

return -1;

}

if (value == NULL) {

return bytearray_setslice(self, i, i+1, NULL);

}

assert(0 <= ival && ival < 256);

PyByteArray_AS_STRING(self)[i] = ival;

return 0;

}

static int

bytearray_setitem(PyObject *op, Py_ssize_t i, PyObject *value)

{

int ret;

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_setitem_lock_held(op, i, value);

Py_END_CRITICAL_SECTION();

return ret;

}

static int

bytearray_ass_subscript_lock_held(PyObject *op, PyObject *index, PyObject *values)

{

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op);

PyByteArrayObject *self = _PyByteArray_CAST(op);

Py_ssize_t start, stop, step, slicelen;

// Do not store a reference to the internal buffer since

// index.__index__() or _getbytevalue() may alter 'self'.

// See https://github.com/python/cpython/issues/91153.

if (_PyIndex_Check(index)) {

Py_ssize_t i = PyNumber_AsSsize_t(index, PyExc_IndexError);

if (i == -1 && PyErr_Occurred()) {

return -1;

}

int ival = -1;

// GH-91153: We need to do this *before* the size check, in case values

// has a nasty __index__ method that changes the size of the bytearray:

if (values && !_getbytevalue(values, &ival)) {

return -1;

}

if (i < 0) {

i += PyByteArray_GET_SIZE(self);

}

if (i < 0 || i >= Py_SIZE(self)) {

PyErr_SetString(PyExc_IndexError, "bytearray index out of range");

return -1;

}

if (values == NULL) {

/* Fall through to slice assignment */

start = i;

stop = i + 1;

step = 1;

slicelen = 1;

}

else {

assert(0 <= ival && ival < 256);

PyByteArray_AS_STRING(self)[i] = (char)ival;

return 0;

}

else if (PySlice_Check(index)) {

if (PySlice_Unpack(index, &start, &stop, &step) < 0) {

return -1;

}

slicelen = PySlice_AdjustIndices(PyByteArray_GET_SIZE(self), &start,

&stop, step);

}

else {

PyErr_Format(PyExc_TypeError,

"bytearray indices must be integers or slices, not %.200s",

Py_TYPE(index)->tp_name);

return -1;

}

char *bytes;

Py_ssize_t needed;

if (values == NULL) {

bytes = NULL;

needed = 0;

}

else if (values == (PyObject *)self || !PyByteArray_Check(values)) {

int err;

if (PyNumber_Check(values) || PyUnicode_Check(values)) {

PyErr_SetString(PyExc_TypeError,

"can assign only bytes, buffers, or iterables "

"of ints in range(0, 256)");

return -1;

}

/* Make a copy and call this function recursively */

values = PyByteArray_FromObject(values);

if (values == NULL)

return -1;

err = bytearray_ass_subscript_lock_held((PyObject*)self, index, values);

Py_DECREF(values);

return err;

}

else {

assert(PyByteArray_Check(values));

bytes = PyByteArray_AS_STRING(values);

needed = Py_SIZE(values);

}

/* Make sure b[5:2] = ... inserts before 5, not before 2. */

if ((step < 0 && start < stop) ||

(step > 0 && start > stop))

{

stop = start;

}

if (step == 1) {

return bytearray_setslice_linear(self, start, stop, bytes, needed);

}

else {

if (needed == 0) {

/* Delete slice */

size_t cur;

Py_ssize_t i;

char *buf = PyByteArray_AS_STRING(self);

if (!_canresize(self))

return -1;

if (slicelen == 0)

/* Nothing to do here. */

return 0;

if (step < 0) {

stop = start + 1;

start = stop + step * (slicelen - 1) - 1;

step = -step;

}

for (cur = start, i = 0;

i < slicelen; cur += step, i++) {

Py_ssize_t lim = step - 1;

if (cur + step >= (size_t)PyByteArray_GET_SIZE(self))

lim = PyByteArray_GET_SIZE(self) - cur - 1;

memmove(buf + cur - i,

buf + cur + 1, lim);

}

/* Move the tail of the bytes, in one chunk */

cur = start + (size_t)slicelen*step;

if (cur < (size_t)PyByteArray_GET_SIZE(self)) {

memmove(buf + cur - slicelen,

buf + cur,

PyByteArray_GET_SIZE(self) - cur);

}

if (bytearray_resize_lock_held((PyObject *)self,

PyByteArray_GET_SIZE(self) - slicelen) < 0)

return -1;

return 0;

}

else {

/* Assign slice */

Py_ssize_t i;

size_t cur;

char *buf = PyByteArray_AS_STRING(self);

if (needed != slicelen) {

PyErr_Format(PyExc_ValueError,

"attempt to assign bytes of size %zd "

"to extended slice of size %zd",

needed, slicelen);

return -1;

}

for (cur = start, i = 0; i < slicelen; cur += step, i++)

buf[cur] = bytes[i];

return 0;

}

static int

bytearray_ass_subscript(PyObject *op, PyObject *index, PyObject *values)

{

int ret;

if (values != NULL && PyByteArray_Check(values)) {

Py_BEGIN_CRITICAL_SECTION2(op, values);

ret = bytearray_ass_subscript_lock_held(op, index, values);

Py_END_CRITICAL_SECTION2();

}

else {

Py_BEGIN_CRITICAL_SECTION(op);

ret = bytearray_ass_subscript_lock_held(op, index, values);

Py_END_CRITICAL_SECTION();

}

return ret;

}

/*[clinic input]

bytearray.__init__

source as arg: object = NULL

encoding: str = NULL

errors: str = NULL

[clinic start generated code]*/

static int

bytearray___init___impl(PyByteArrayObject *self, PyObject *arg,

const char *encoding, const char *errors)

/*[clinic end generated code: output=4ce1304649c2f8b3 input=1141a7122eefd7b9]*/

{

Py_ssize_t count;

PyObject *it;

PyObject *(*iternext)(PyObject *);

/* First __init__; set ob_bytes_object so ob_bytes is always non-null. */

if (self->ob_bytes_object == NULL) {

self->ob_bytes_object = Py_GetConstant(Py_CONSTANT_EMPTY_BYTES);

bytearray_reinit_from_bytes(self, 0, 0);

self->ob_exports = 0;

}

if (Py_SIZE(self) != 0) {

/* Empty previous contents (yes, do this first of all!) */

if (PyByteArray_Resize((PyObject *)self, 0) < 0)

return -1;

}

/* Should be caused by first init or the resize to 0. */

assert(self->ob_bytes_object == Py_GetConstantBorrowed(Py_CONSTANT_EMPTY_BYTES));

assert(self->ob_exports == 0);

/* Make a quick exit if no first argument */

if (arg == NULL) {

if (encoding != NULL || errors != NULL) {

PyErr_SetString(PyExc_TypeError,

encoding != NULL ?

"encoding without a string argument" :

"errors without a string argument");

return -1;

}

return 0;

}

if (PyUnicode_Check(arg)) {

/* Encode via the codec registry */

PyObject *encoded, *new;

if (encoding == NULL) {

PyErr_SetString(PyExc_TypeError,

"string argument without an encoding");

return -1;

}

encoded = PyUnicode_AsEncodedString(arg, encoding, errors);

if (encoded == NULL) {

return -1;

}

assert(PyBytes_Check(encoded));

/* Most encodes return a new unique bytes, just use it as buffer. */

if (_PyObject_IsUniquelyReferenced(encoded)

&& PyBytes_CheckExact(encoded))

{

Py_ssize_t size = Py_SIZE(encoded);

self->ob_bytes_object = encoded;

bytearray_reinit_from_bytes(self, size, size);

return 0;

}

new = bytearray_iconcat((PyObject*)self, encoded);

Py_DECREF(encoded);

if (new == NULL)

return -1;

Py_DECREF(new);

return 0;

}

/* If it's not unicode, there can't be encoding or errors */

if (encoding != NULL || errors != NULL) {

PyErr_SetString(PyExc_TypeError,

encoding != NULL ?

"encoding without a string argument" :

"errors without a string argument");

return -1;

}

/* Is it an int? */

if (_PyIndex_Check(arg)) {

count = PyNumber_AsSsize_t(arg, PyExc_OverflowError);

if (count == -1 && PyErr_Occurred()) {

if (!PyErr_ExceptionMatches(PyExc_TypeError))

return -1;

PyErr_Clear(); /* fall through */

}

else {

View remainder of file in raw view

cpython/Objects/bytearrayobject.c at ModuleNotFoundError-suggestions · FFY00/cpython · GitHub

Expand file tree

Breadcrumbs

bytearrayobject.c

Latest commit

History

Breadcrumbs

bytearrayobject.c

File metadata and controls