Alexandre Vassalotti | 77250f4 | 2008-05-06 19:48:38 +0000 | [diff] [blame^] | 1 | #include "Python.h" |
| 2 | |
| 3 | typedef struct { |
| 4 | PyObject_HEAD |
| 5 | char *buf; |
| 6 | Py_ssize_t pos; |
| 7 | Py_ssize_t string_size; |
| 8 | size_t buf_size; |
| 9 | } BytesIOObject; |
| 10 | |
| 11 | #define CHECK_CLOSED(self) \ |
| 12 | if ((self)->buf == NULL) { \ |
| 13 | PyErr_SetString(PyExc_ValueError, \ |
| 14 | "I/O operation on closed file."); \ |
| 15 | return NULL; \ |
| 16 | } |
| 17 | |
| 18 | /* Internal routine to get a line from the buffer of a BytesIO |
| 19 | object. Returns the length between the current position to the |
| 20 | next newline character. */ |
| 21 | static Py_ssize_t |
| 22 | get_line(BytesIOObject *self, char **output) |
| 23 | { |
| 24 | char *n; |
| 25 | const char *str_end; |
| 26 | Py_ssize_t len; |
| 27 | |
| 28 | assert(self->buf != NULL); |
| 29 | |
| 30 | /* Move to the end of the line, up to the end of the string, s. */ |
| 31 | str_end = self->buf + self->string_size; |
| 32 | for (n = self->buf + self->pos; |
| 33 | n < str_end && *n != '\n'; |
| 34 | n++); |
| 35 | |
| 36 | /* Skip the newline character */ |
| 37 | if (n < str_end) |
| 38 | n++; |
| 39 | |
| 40 | /* Get the length from the current position to the end of the line. */ |
| 41 | len = n - (self->buf + self->pos); |
| 42 | *output = self->buf + self->pos; |
| 43 | |
| 44 | assert(len >= 0); |
| 45 | assert(self->pos < PY_SSIZE_T_MAX - len); |
| 46 | self->pos += len; |
| 47 | |
| 48 | return len; |
| 49 | } |
| 50 | |
| 51 | /* Internal routine for changing the size of the buffer of BytesIO objects. |
| 52 | The caller should ensure that the 'size' argument is non-negative. Returns |
| 53 | 0 on success, -1 otherwise. */ |
| 54 | static int |
| 55 | resize_buffer(BytesIOObject *self, size_t size) |
| 56 | { |
| 57 | /* Here, unsigned types are used to avoid dealing with signed integer |
| 58 | overflow, which is undefined in C. */ |
| 59 | size_t alloc = self->buf_size; |
| 60 | char *new_buf = NULL; |
| 61 | |
| 62 | assert(self->buf != NULL); |
| 63 | |
| 64 | /* For simplicity, stay in the range of the signed type. Anyway, Python |
| 65 | doesn't allow strings to be longer than this. */ |
| 66 | if (size > PY_SSIZE_T_MAX) |
| 67 | goto overflow; |
| 68 | |
| 69 | if (size < alloc / 2) { |
| 70 | /* Major downsize; resize down to exact size. */ |
| 71 | alloc = size + 1; |
| 72 | } |
| 73 | else if (size < alloc) { |
| 74 | /* Within allocated size; quick exit */ |
| 75 | return 0; |
| 76 | } |
| 77 | else if (size <= alloc * 1.125) { |
| 78 | /* Moderate upsize; overallocate similar to list_resize() */ |
| 79 | alloc = size + (size >> 3) + (size < 9 ? 3 : 6); |
| 80 | } |
| 81 | else { |
| 82 | /* Major upsize; resize up to exact size */ |
| 83 | alloc = size + 1; |
| 84 | } |
| 85 | |
| 86 | if (alloc > ((size_t)-1) / sizeof(char)) |
| 87 | goto overflow; |
| 88 | new_buf = (char *)PyMem_Realloc(self->buf, alloc * sizeof(char)); |
| 89 | if (new_buf == NULL) { |
| 90 | PyErr_NoMemory(); |
| 91 | return -1; |
| 92 | } |
| 93 | self->buf_size = alloc; |
| 94 | self->buf = new_buf; |
| 95 | |
| 96 | return 0; |
| 97 | |
| 98 | overflow: |
| 99 | PyErr_SetString(PyExc_OverflowError, |
| 100 | "new buffer size too large"); |
| 101 | return -1; |
| 102 | } |
| 103 | |
| 104 | /* Internal routine for writing a string of bytes to the buffer of a BytesIO |
| 105 | object. Returns the number of bytes wrote, or -1 on error. */ |
| 106 | static Py_ssize_t |
| 107 | write_bytes(BytesIOObject *self, const char *bytes, Py_ssize_t len) |
| 108 | { |
| 109 | assert(self->buf != NULL); |
| 110 | assert(self->pos >= 0); |
| 111 | assert(len >= 0); |
| 112 | |
| 113 | /* This overflow check is not strictly necessary. However, it avoids us to |
| 114 | deal with funky things like comparing an unsigned and a signed |
| 115 | integer. */ |
| 116 | if (self->pos > PY_SSIZE_T_MAX - len) { |
| 117 | PyErr_SetString(PyExc_OverflowError, |
| 118 | "new position too large"); |
| 119 | return -1; |
| 120 | } |
| 121 | if (self->pos + len > self->buf_size) { |
| 122 | if (resize_buffer(self, self->pos + len) < 0) |
| 123 | return -1; |
| 124 | } |
| 125 | |
| 126 | if (self->pos > self->string_size) { |
| 127 | /* In case of overseek, pad with null bytes the buffer region between |
| 128 | the end of stream and the current position. |
| 129 | |
| 130 | 0 lo string_size hi |
| 131 | | |<---used--->|<----------available----------->| |
| 132 | | | <--to pad-->|<---to write---> | |
| 133 | 0 buf position |
| 134 | */ |
| 135 | memset(self->buf + self->string_size, '\0', |
| 136 | (self->pos - self->string_size) * sizeof(char)); |
| 137 | } |
| 138 | |
| 139 | /* Copy the data to the internal buffer, overwriting some of the existing |
| 140 | data if self->pos < self->string_size. */ |
| 141 | memcpy(self->buf + self->pos, bytes, len); |
| 142 | self->pos += len; |
| 143 | |
| 144 | /* Set the new length of the internal string if it has changed. */ |
| 145 | if (self->string_size < self->pos) { |
| 146 | self->string_size = self->pos; |
| 147 | } |
| 148 | |
| 149 | return len; |
| 150 | } |
| 151 | |
| 152 | static PyObject * |
| 153 | bytesio_get_closed(BytesIOObject *self) |
| 154 | { |
| 155 | if (self->buf == NULL) |
| 156 | Py_RETURN_TRUE; |
| 157 | else |
| 158 | Py_RETURN_FALSE; |
| 159 | } |
| 160 | |
| 161 | /* Generic getter for the writable, readable and seekable properties */ |
| 162 | static PyObject * |
| 163 | return_true(BytesIOObject *self) |
| 164 | { |
| 165 | Py_RETURN_TRUE; |
| 166 | } |
| 167 | |
| 168 | PyDoc_STRVAR(flush_doc, |
| 169 | "flush() -> None. Does nothing."); |
| 170 | |
| 171 | static PyObject * |
| 172 | bytesio_flush(BytesIOObject *self) |
| 173 | { |
| 174 | Py_RETURN_NONE; |
| 175 | } |
| 176 | |
| 177 | PyDoc_STRVAR(getval_doc, |
| 178 | "getvalue() -> string.\n" |
| 179 | "\n" |
| 180 | "Retrieve the entire contents of the BytesIO object."); |
| 181 | |
| 182 | static PyObject * |
| 183 | bytesio_getvalue(BytesIOObject *self) |
| 184 | { |
| 185 | CHECK_CLOSED(self); |
| 186 | return PyString_FromStringAndSize(self->buf, self->string_size); |
| 187 | } |
| 188 | |
| 189 | PyDoc_STRVAR(isatty_doc, |
| 190 | "isatty() -> False.\n" |
| 191 | "\n" |
| 192 | "Always returns False since BytesIO objects are not connected\n" |
| 193 | "to a tty-like device."); |
| 194 | |
| 195 | static PyObject * |
| 196 | bytesio_isatty(BytesIOObject *self) |
| 197 | { |
| 198 | CHECK_CLOSED(self); |
| 199 | Py_RETURN_FALSE; |
| 200 | } |
| 201 | |
| 202 | PyDoc_STRVAR(tell_doc, |
| 203 | "tell() -> current file position, an integer\n"); |
| 204 | |
| 205 | static PyObject * |
| 206 | bytesio_tell(BytesIOObject *self) |
| 207 | { |
| 208 | CHECK_CLOSED(self); |
| 209 | return PyLong_FromSsize_t(self->pos); |
| 210 | } |
| 211 | |
| 212 | PyDoc_STRVAR(read_doc, |
| 213 | "read([size]) -> read at most size bytes, returned as a string.\n" |
| 214 | "\n" |
| 215 | "If the size argument is negative, read until EOF is reached.\n" |
| 216 | "Return an empty string at EOF."); |
| 217 | |
| 218 | static PyObject * |
| 219 | bytesio_read(BytesIOObject *self, PyObject *args) |
| 220 | { |
| 221 | Py_ssize_t size, n; |
| 222 | char *output; |
| 223 | PyObject *arg = Py_None; |
| 224 | |
| 225 | CHECK_CLOSED(self); |
| 226 | |
| 227 | if (!PyArg_ParseTuple(args, "|O:read", &arg)) |
| 228 | return NULL; |
| 229 | |
| 230 | if (PyLong_Check(arg)) { |
| 231 | size = PyLong_AsSsize_t(arg); |
| 232 | } |
| 233 | else if (arg == Py_None) { |
| 234 | /* Read until EOF is reached, by default. */ |
| 235 | size = -1; |
| 236 | } |
| 237 | else { |
| 238 | PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'", |
| 239 | Py_TYPE(arg)->tp_name); |
| 240 | return NULL; |
| 241 | } |
| 242 | |
| 243 | /* adjust invalid sizes */ |
| 244 | n = self->string_size - self->pos; |
| 245 | if (size < 0 || size > n) { |
| 246 | size = n; |
| 247 | if (size < 0) |
| 248 | size = 0; |
| 249 | } |
| 250 | |
| 251 | assert(self->buf != NULL); |
| 252 | output = self->buf + self->pos; |
| 253 | self->pos += size; |
| 254 | |
| 255 | return PyString_FromStringAndSize(output, size); |
| 256 | } |
| 257 | |
| 258 | |
| 259 | PyDoc_STRVAR(read1_doc, |
| 260 | "read1(size) -> read at most size bytes, returned as a string.\n" |
| 261 | "\n" |
| 262 | "If the size argument is negative or omitted, read until EOF is reached.\n" |
| 263 | "Return an empty string at EOF."); |
| 264 | |
| 265 | static PyObject * |
| 266 | bytesio_read1(BytesIOObject *self, PyObject *n) |
| 267 | { |
| 268 | PyObject *arg, *res; |
| 269 | |
| 270 | arg = PyTuple_Pack(1, n); |
| 271 | if (arg == NULL) |
| 272 | return NULL; |
| 273 | res = bytesio_read(self, arg); |
| 274 | Py_DECREF(arg); |
| 275 | return res; |
| 276 | } |
| 277 | |
| 278 | PyDoc_STRVAR(readline_doc, |
| 279 | "readline([size]) -> next line from the file, as a string.\n" |
| 280 | "\n" |
| 281 | "Retain newline. A non-negative size argument limits the maximum\n" |
| 282 | "number of bytes to return (an incomplete line may be returned then).\n" |
| 283 | "Return an empty string at EOF.\n"); |
| 284 | |
| 285 | static PyObject * |
| 286 | bytesio_readline(BytesIOObject *self, PyObject *args) |
| 287 | { |
| 288 | Py_ssize_t size, n; |
| 289 | char *output; |
| 290 | PyObject *arg = Py_None; |
| 291 | |
| 292 | CHECK_CLOSED(self); |
| 293 | |
| 294 | if (!PyArg_ParseTuple(args, "|O:readline", &arg)) |
| 295 | return NULL; |
| 296 | |
| 297 | if (PyLong_Check(arg)) { |
| 298 | size = PyLong_AsSsize_t(arg); |
| 299 | } |
| 300 | else if (arg == Py_None) { |
| 301 | /* No size limit, by default. */ |
| 302 | size = -1; |
| 303 | } |
| 304 | else { |
| 305 | PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'", |
| 306 | Py_TYPE(arg)->tp_name); |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | n = get_line(self, &output); |
| 311 | |
| 312 | if (size >= 0 && size < n) { |
| 313 | size = n - size; |
| 314 | n -= size; |
| 315 | self->pos -= size; |
| 316 | } |
| 317 | |
| 318 | return PyString_FromStringAndSize(output, n); |
| 319 | } |
| 320 | |
| 321 | PyDoc_STRVAR(readlines_doc, |
| 322 | "readlines([size]) -> list of strings, each a line from the file.\n" |
| 323 | "\n" |
| 324 | "Call readline() repeatedly and return a list of the lines so read.\n" |
| 325 | "The optional size argument, if given, is an approximate bound on the\n" |
| 326 | "total number of bytes in the lines returned.\n"); |
| 327 | |
| 328 | static PyObject * |
| 329 | bytesio_readlines(BytesIOObject *self, PyObject *args) |
| 330 | { |
| 331 | Py_ssize_t maxsize, size, n; |
| 332 | PyObject *result, *line; |
| 333 | char *output; |
| 334 | PyObject *arg = Py_None; |
| 335 | |
| 336 | CHECK_CLOSED(self); |
| 337 | |
| 338 | if (!PyArg_ParseTuple(args, "|O:readlines", &arg)) |
| 339 | return NULL; |
| 340 | |
| 341 | if (PyLong_Check(arg)) { |
| 342 | maxsize = PyLong_AsSsize_t(arg); |
| 343 | } |
| 344 | else if (arg == Py_None) { |
| 345 | /* No size limit, by default. */ |
| 346 | maxsize = -1; |
| 347 | } |
| 348 | else { |
| 349 | PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'", |
| 350 | Py_TYPE(arg)->tp_name); |
| 351 | return NULL; |
| 352 | } |
| 353 | |
| 354 | size = 0; |
| 355 | result = PyList_New(0); |
| 356 | if (!result) |
| 357 | return NULL; |
| 358 | |
| 359 | while ((n = get_line(self, &output)) != 0) { |
| 360 | line = PyString_FromStringAndSize(output, n); |
| 361 | if (!line) |
| 362 | goto on_error; |
| 363 | if (PyList_Append(result, line) == -1) { |
| 364 | Py_DECREF(line); |
| 365 | goto on_error; |
| 366 | } |
| 367 | Py_DECREF(line); |
| 368 | size += n; |
| 369 | if (maxsize > 0 && size >= maxsize) |
| 370 | break; |
| 371 | } |
| 372 | return result; |
| 373 | |
| 374 | on_error: |
| 375 | Py_DECREF(result); |
| 376 | return NULL; |
| 377 | } |
| 378 | |
| 379 | PyDoc_STRVAR(readinto_doc, |
| 380 | "readinto(bytes) -> int. Read up to len(b) bytes into b.\n" |
| 381 | "\n" |
| 382 | "Returns number of bytes read (0 for EOF), or None if the object\n" |
| 383 | "is set not to block as has no data to read."); |
| 384 | |
| 385 | static PyObject * |
| 386 | bytesio_readinto(BytesIOObject *self, PyObject *buffer) |
| 387 | { |
| 388 | void *raw_buffer; |
| 389 | Py_ssize_t len; |
| 390 | |
| 391 | CHECK_CLOSED(self); |
| 392 | |
| 393 | if (PyObject_AsWriteBuffer(buffer, &raw_buffer, &len) == -1) |
| 394 | return NULL; |
| 395 | |
| 396 | if (self->pos + len > self->string_size) |
| 397 | len = self->string_size - self->pos; |
| 398 | |
| 399 | memcpy(raw_buffer, self->buf + self->pos, len); |
| 400 | assert(self->pos + len < PY_SSIZE_T_MAX); |
| 401 | assert(len >= 0); |
| 402 | self->pos += len; |
| 403 | |
| 404 | return PyLong_FromSsize_t(len); |
| 405 | } |
| 406 | |
| 407 | PyDoc_STRVAR(truncate_doc, |
| 408 | "truncate([size]) -> int. Truncate the file to at most size bytes.\n" |
| 409 | "\n" |
| 410 | "Size defaults to the current file position, as returned by tell().\n" |
| 411 | "Returns the new size. Imply an absolute seek to the position size."); |
| 412 | |
| 413 | static PyObject * |
| 414 | bytesio_truncate(BytesIOObject *self, PyObject *args) |
| 415 | { |
| 416 | Py_ssize_t size; |
| 417 | PyObject *arg = Py_None; |
| 418 | |
| 419 | CHECK_CLOSED(self); |
| 420 | |
| 421 | if (!PyArg_ParseTuple(args, "|O:truncate", &arg)) |
| 422 | return NULL; |
| 423 | |
| 424 | if (PyLong_Check(arg)) { |
| 425 | size = PyLong_AsSsize_t(arg); |
| 426 | } |
| 427 | else if (arg == Py_None) { |
| 428 | /* Truncate to current position if no argument is passed. */ |
| 429 | size = self->pos; |
| 430 | } |
| 431 | else { |
| 432 | PyErr_Format(PyExc_TypeError, "integer argument expected, got '%s'", |
| 433 | Py_TYPE(arg)->tp_name); |
| 434 | return NULL; |
| 435 | } |
| 436 | |
| 437 | if (size < 0) { |
| 438 | PyErr_Format(PyExc_ValueError, |
| 439 | "negative size value %zd", size); |
| 440 | return NULL; |
| 441 | } |
| 442 | |
| 443 | if (size < self->string_size) { |
| 444 | self->string_size = size; |
| 445 | if (resize_buffer(self, size) < 0) |
| 446 | return NULL; |
| 447 | } |
| 448 | self->pos = size; |
| 449 | |
| 450 | return PyLong_FromSsize_t(size); |
| 451 | } |
| 452 | |
| 453 | static PyObject * |
| 454 | bytesio_iternext(BytesIOObject *self) |
| 455 | { |
| 456 | char *next; |
| 457 | Py_ssize_t n; |
| 458 | |
| 459 | CHECK_CLOSED(self); |
| 460 | |
| 461 | n = get_line(self, &next); |
| 462 | |
| 463 | if (!next || n == 0) |
| 464 | return NULL; |
| 465 | |
| 466 | return PyString_FromStringAndSize(next, n); |
| 467 | } |
| 468 | |
| 469 | PyDoc_STRVAR(seek_doc, |
| 470 | "seek(pos, whence=0) -> int. Change stream position.\n" |
| 471 | "\n" |
| 472 | "Seek to byte offset pos relative to position indicated by whence:\n" |
| 473 | " 0 Start of stream (the default). pos should be >= 0;\n" |
| 474 | " 1 Current position - pos may be negative;\n" |
| 475 | " 2 End of stream - pos usually negative.\n" |
| 476 | "Returns the new absolute position."); |
| 477 | |
| 478 | static PyObject * |
| 479 | bytesio_seek(BytesIOObject *self, PyObject *args) |
| 480 | { |
| 481 | Py_ssize_t pos; |
| 482 | int mode = 0; |
| 483 | |
| 484 | CHECK_CLOSED(self); |
| 485 | |
| 486 | if (!PyArg_ParseTuple(args, "n|i:seek", &pos, &mode)) |
| 487 | return NULL; |
| 488 | |
| 489 | if (pos < 0 && mode == 0) { |
| 490 | PyErr_Format(PyExc_ValueError, |
| 491 | "negative seek value %zd", pos); |
| 492 | return NULL; |
| 493 | } |
| 494 | |
| 495 | /* mode 0: offset relative to beginning of the string. |
| 496 | mode 1: offset relative to current position. |
| 497 | mode 2: offset relative the end of the string. */ |
| 498 | if (mode == 1) { |
| 499 | if (pos > PY_SSIZE_T_MAX - self->pos) { |
| 500 | PyErr_SetString(PyExc_OverflowError, |
| 501 | "new position too large"); |
| 502 | return NULL; |
| 503 | } |
| 504 | pos += self->pos; |
| 505 | } |
| 506 | else if (mode == 2) { |
| 507 | if (pos > PY_SSIZE_T_MAX - self->string_size) { |
| 508 | PyErr_SetString(PyExc_OverflowError, |
| 509 | "new position too large"); |
| 510 | return NULL; |
| 511 | } |
| 512 | pos += self->string_size; |
| 513 | } |
| 514 | else if (mode != 0) { |
| 515 | PyErr_Format(PyExc_ValueError, |
| 516 | "invalid whence (%i, should be 0, 1 or 2)", mode); |
| 517 | return NULL; |
| 518 | } |
| 519 | |
| 520 | if (pos < 0) |
| 521 | pos = 0; |
| 522 | self->pos = pos; |
| 523 | |
| 524 | return PyLong_FromSsize_t(self->pos); |
| 525 | } |
| 526 | |
| 527 | PyDoc_STRVAR(write_doc, |
| 528 | "write(str) -> int. Write string str to file.\n" |
| 529 | "\n" |
| 530 | "Return the number of bytes written."); |
| 531 | |
| 532 | static PyObject * |
| 533 | bytesio_write(BytesIOObject *self, PyObject *obj) |
| 534 | { |
| 535 | const char *bytes; |
| 536 | Py_ssize_t size; |
| 537 | Py_ssize_t n = 0; |
| 538 | |
| 539 | CHECK_CLOSED(self); |
| 540 | |
| 541 | if (PyObject_AsReadBuffer(obj, (void *)&bytes, &size) < 0) |
| 542 | return NULL; |
| 543 | |
| 544 | if (size != 0) { |
| 545 | n = write_bytes(self, bytes, size); |
| 546 | if (n < 0) |
| 547 | return NULL; |
| 548 | } |
| 549 | |
| 550 | return PyLong_FromSsize_t(n); |
| 551 | } |
| 552 | |
| 553 | PyDoc_STRVAR(writelines_doc, |
| 554 | "writelines(sequence_of_strings) -> None. Write the strings to the file.\n" |
| 555 | "\n" |
| 556 | "Note that newlines are not added. The sequence can be any iterable object\n" |
| 557 | "producing strings. This is equivalent to calling write() for each string."); |
| 558 | |
| 559 | static PyObject * |
| 560 | bytesio_writelines(BytesIOObject *self, PyObject *v) |
| 561 | { |
| 562 | PyObject *it, *item; |
| 563 | PyObject *ret; |
| 564 | |
| 565 | CHECK_CLOSED(self); |
| 566 | |
| 567 | it = PyObject_GetIter(v); |
| 568 | if (it == NULL) |
| 569 | return NULL; |
| 570 | |
| 571 | while ((item = PyIter_Next(it)) != NULL) { |
| 572 | ret = bytesio_write(self, item); |
| 573 | Py_DECREF(item); |
| 574 | if (ret == NULL) { |
| 575 | Py_DECREF(it); |
| 576 | return NULL; |
| 577 | } |
| 578 | Py_DECREF(ret); |
| 579 | } |
| 580 | Py_DECREF(it); |
| 581 | |
| 582 | /* See if PyIter_Next failed */ |
| 583 | if (PyErr_Occurred()) |
| 584 | return NULL; |
| 585 | |
| 586 | Py_RETURN_NONE; |
| 587 | } |
| 588 | |
| 589 | PyDoc_STRVAR(close_doc, |
| 590 | "close() -> None. Disable all I/O operations."); |
| 591 | |
| 592 | static PyObject * |
| 593 | bytesio_close(BytesIOObject *self) |
| 594 | { |
| 595 | if (self->buf != NULL) { |
| 596 | PyMem_Free(self->buf); |
| 597 | self->buf = NULL; |
| 598 | } |
| 599 | Py_RETURN_NONE; |
| 600 | } |
| 601 | |
| 602 | static void |
| 603 | bytesio_dealloc(BytesIOObject *self) |
| 604 | { |
| 605 | if (self->buf != NULL) { |
| 606 | PyMem_Free(self->buf); |
| 607 | self->buf = NULL; |
| 608 | } |
| 609 | Py_TYPE(self)->tp_free(self); |
| 610 | } |
| 611 | |
| 612 | static PyObject * |
| 613 | bytesio_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 614 | { |
| 615 | BytesIOObject *self; |
| 616 | |
| 617 | assert(type != NULL && type->tp_alloc != NULL); |
| 618 | self = (BytesIOObject *)type->tp_alloc(type, 0); |
| 619 | if (self == NULL) |
| 620 | return NULL; |
| 621 | |
| 622 | self->string_size = 0; |
| 623 | self->pos = 0; |
| 624 | self->buf_size = 0; |
| 625 | self->buf = (char *)PyMem_Malloc(0); |
| 626 | if (self->buf == NULL) { |
| 627 | Py_DECREF(self); |
| 628 | return PyErr_NoMemory(); |
| 629 | } |
| 630 | |
| 631 | return (PyObject *)self; |
| 632 | } |
| 633 | |
| 634 | static int |
| 635 | bytesio_init(BytesIOObject *self, PyObject *args, PyObject *kwds) |
| 636 | { |
| 637 | PyObject *initvalue = NULL; |
| 638 | |
| 639 | if (!PyArg_ParseTuple(args, "|O:BytesIO", &initvalue)) |
| 640 | return -1; |
| 641 | |
| 642 | /* In case, __init__ is called multiple times. */ |
| 643 | self->string_size = 0; |
| 644 | self->pos = 0; |
| 645 | |
| 646 | if (initvalue && initvalue != Py_None) { |
| 647 | PyObject *res; |
| 648 | res = bytesio_write(self, initvalue); |
| 649 | if (res == NULL) |
| 650 | return -1; |
| 651 | Py_DECREF(res); |
| 652 | self->pos = 0; |
| 653 | } |
| 654 | |
| 655 | return 0; |
| 656 | } |
| 657 | |
| 658 | static PyGetSetDef bytesio_getsetlist[] = { |
| 659 | {"closed", (getter)bytesio_get_closed, NULL, |
| 660 | "True if the file is closed."}, |
| 661 | {0}, /* sentinel */ |
| 662 | }; |
| 663 | |
| 664 | static struct PyMethodDef bytesio_methods[] = { |
| 665 | {"readable", (PyCFunction)return_true, METH_NOARGS, NULL}, |
| 666 | {"seekable", (PyCFunction)return_true, METH_NOARGS, NULL}, |
| 667 | {"writable", (PyCFunction)return_true, METH_NOARGS, NULL}, |
| 668 | {"close", (PyCFunction)bytesio_close, METH_NOARGS, close_doc}, |
| 669 | {"flush", (PyCFunction)bytesio_flush, METH_NOARGS, flush_doc}, |
| 670 | {"isatty", (PyCFunction)bytesio_isatty, METH_NOARGS, isatty_doc}, |
| 671 | {"tell", (PyCFunction)bytesio_tell, METH_NOARGS, tell_doc}, |
| 672 | {"write", (PyCFunction)bytesio_write, METH_O, write_doc}, |
| 673 | {"writelines", (PyCFunction)bytesio_writelines, METH_O, writelines_doc}, |
| 674 | {"read1", (PyCFunction)bytesio_read1, METH_O, read1_doc}, |
| 675 | {"readinto", (PyCFunction)bytesio_readinto, METH_O, readinto_doc}, |
| 676 | {"readline", (PyCFunction)bytesio_readline, METH_VARARGS, readline_doc}, |
| 677 | {"readlines", (PyCFunction)bytesio_readlines, METH_VARARGS, readlines_doc}, |
| 678 | {"read", (PyCFunction)bytesio_read, METH_VARARGS, read_doc}, |
| 679 | {"getvalue", (PyCFunction)bytesio_getvalue, METH_VARARGS, getval_doc}, |
| 680 | {"seek", (PyCFunction)bytesio_seek, METH_VARARGS, seek_doc}, |
| 681 | {"truncate", (PyCFunction)bytesio_truncate, METH_VARARGS, truncate_doc}, |
| 682 | {NULL, NULL} /* sentinel */ |
| 683 | }; |
| 684 | |
| 685 | PyDoc_STRVAR(bytesio_doc, |
| 686 | "BytesIO([buffer]) -> object\n" |
| 687 | "\n" |
| 688 | "Create a buffered I/O implementation using an in-memory bytes\n" |
| 689 | "buffer, ready for reading and writing."); |
| 690 | |
| 691 | static PyTypeObject BytesIO_Type = { |
| 692 | PyVarObject_HEAD_INIT(NULL, 0) |
| 693 | "_bytesio._BytesIO", /*tp_name*/ |
| 694 | sizeof(BytesIOObject), /*tp_basicsize*/ |
| 695 | 0, /*tp_itemsize*/ |
| 696 | (destructor)bytesio_dealloc, /*tp_dealloc*/ |
| 697 | 0, /*tp_print*/ |
| 698 | 0, /*tp_getattr*/ |
| 699 | 0, /*tp_setattr*/ |
| 700 | 0, /*tp_compare*/ |
| 701 | 0, /*tp_repr*/ |
| 702 | 0, /*tp_as_number*/ |
| 703 | 0, /*tp_as_sequence*/ |
| 704 | 0, /*tp_as_mapping*/ |
| 705 | 0, /*tp_hash*/ |
| 706 | 0, /*tp_call*/ |
| 707 | 0, /*tp_str*/ |
| 708 | 0, /*tp_getattro*/ |
| 709 | 0, /*tp_setattro*/ |
| 710 | 0, /*tp_as_buffer*/ |
| 711 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/ |
| 712 | bytesio_doc, /*tp_doc*/ |
| 713 | 0, /*tp_traverse*/ |
| 714 | 0, /*tp_clear*/ |
| 715 | 0, /*tp_richcompare*/ |
| 716 | 0, /*tp_weaklistoffset*/ |
| 717 | PyObject_SelfIter, /*tp_iter*/ |
| 718 | (iternextfunc)bytesio_iternext, /*tp_iternext*/ |
| 719 | bytesio_methods, /*tp_methods*/ |
| 720 | 0, /*tp_members*/ |
| 721 | bytesio_getsetlist, /*tp_getset*/ |
| 722 | 0, /*tp_base*/ |
| 723 | 0, /*tp_dict*/ |
| 724 | 0, /*tp_descr_get*/ |
| 725 | 0, /*tp_descr_set*/ |
| 726 | 0, /*tp_dictoffset*/ |
| 727 | (initproc)bytesio_init, /*tp_init*/ |
| 728 | 0, /*tp_alloc*/ |
| 729 | bytesio_new, /*tp_new*/ |
| 730 | }; |
| 731 | |
| 732 | PyMODINIT_FUNC |
| 733 | init_bytesio(void) |
| 734 | { |
| 735 | PyObject *m; |
| 736 | |
| 737 | if (PyType_Ready(&BytesIO_Type) < 0) |
| 738 | return; |
| 739 | m = Py_InitModule("_bytesio", NULL); |
| 740 | if (m == NULL) |
| 741 | return; |
| 742 | Py_INCREF(&BytesIO_Type); |
| 743 | PyModule_AddObject(m, "_BytesIO", (PyObject *)&BytesIO_Type); |
| 744 | } |