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GeezerVison is showing github.com — cpython/Modules/_testbuffer.c at 3.13 · python/cpython Expand file tree/ Copy path_testbuffer.cMore file actions 2912 lines (2463 loc) · 82.6 KB / Copy path_testbuffer.cFile metadata and controls2912 lines (2463 loc) · 82.6 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* C Extension module to test all aspects of PEP-3118. Written by Stefan Krah. */ #include "Python.h" /* struct module */ static PyObject *structmodule = NULL; static PyObject *Struct = NULL; static PyObject *calcsize = NULL; /* cache simple format string */ static const char *simple_fmt = "B"; static PyObject *simple_format = NULL; #define SIMPLE_FORMAT(fmt) (fmt == NULL || strcmp(fmt, "B") == 0) #define FIX_FORMAT(fmt) (fmt == NULL ? "B" : fmt) /**************************************************************************/ /* NDArray Object */ /**************************************************************************/ static PyTypeObject NDArray_Type; #define NDArray_Check(v) Py_IS_TYPE(v, &NDArray_Type) #define CHECK_LIST_OR_TUPLE(v) \ if (!PyList_Check(v) && !PyTuple_Check(v)) { \ PyErr_SetString(PyExc_TypeError, \ #v " must be a list or a tuple"); \ return NULL; \ } \ #define PyMem_XFree(v) \ do { if (v) PyMem_Free(v); } while (0) /* Maximum number of dimensions. */ #define ND_MAX_NDIM (2 * PyBUF_MAX_NDIM) /* Check for the presence of suboffsets in the first dimension. */ #define HAVE_PTR(suboffsets) (suboffsets && suboffsets[0] >= 0) /* Adjust ptr if suboffsets are present. */ #define ADJUST_PTR(ptr, suboffsets) \ (HAVE_PTR(suboffsets) ? *((char**)ptr) + suboffsets[0] : ptr) /* Default: NumPy style (strides), read-only, no var-export, C-style layout */ #define ND_DEFAULT 0x000 /* User configurable flags for the ndarray */ #define ND_VAREXPORT 0x001 /* change layout while buffers are exported */ /* User configurable flags for each base buffer */ #define ND_WRITABLE 0x002 /* mark base buffer as writable */ #define ND_FORTRAN 0x004 /* Fortran contiguous layout */ #define ND_SCALAR 0x008 /* scalar: ndim = 0 */ #define ND_PIL 0x010 /* convert to PIL-style array (suboffsets) */ #define ND_REDIRECT 0x020 /* redirect buffer requests */ #define ND_GETBUF_FAIL 0x040 /* trigger getbuffer failure */ #define ND_GETBUF_UNDEFINED 0x080 /* undefined view.obj */ /* Internal flags for the base buffer */ #define ND_C 0x100 /* C contiguous layout (default) */ #define ND_OWN_ARRAYS 0x200 /* consumer owns arrays */ /* ndarray properties */ #define ND_IS_CONSUMER(nd) \ (((NDArrayObject *)nd)->head == &((NDArrayObject *)nd)->staticbuf) /* ndbuf->flags properties */ #define ND_C_CONTIGUOUS(flags) (!!(flags&(ND_SCALAR|ND_C))) #define ND_FORTRAN_CONTIGUOUS(flags) (!!(flags&(ND_SCALAR|ND_FORTRAN))) #define ND_ANY_CONTIGUOUS(flags) (!!(flags&(ND_SCALAR|ND_C|ND_FORTRAN))) /* getbuffer() requests */ #define REQ_INDIRECT(flags) ((flags&PyBUF_INDIRECT) == PyBUF_INDIRECT) #define REQ_C_CONTIGUOUS(flags) ((flags&PyBUF_C_CONTIGUOUS) == PyBUF_C_CONTIGUOUS) #define REQ_F_CONTIGUOUS(flags) ((flags&PyBUF_F_CONTIGUOUS) == PyBUF_F_CONTIGUOUS) #define REQ_ANY_CONTIGUOUS(flags) ((flags&PyBUF_ANY_CONTIGUOUS) == PyBUF_ANY_CONTIGUOUS) #define REQ_STRIDES(flags) ((flags&PyBUF_STRIDES) == PyBUF_STRIDES) #define REQ_SHAPE(flags) ((flags&PyBUF_ND) == PyBUF_ND) #define REQ_WRITABLE(flags) (flags&PyBUF_WRITABLE) #define REQ_FORMAT(flags) (flags&PyBUF_FORMAT) /* Single node of a list of base buffers. The list is needed to implement changes in memory layout while exported buffers are active. */ static PyTypeObject NDArray_Type; struct ndbuf; typedef struct ndbuf { struct ndbuf *next; struct ndbuf *prev; Py_ssize_t len; /* length of data */ Py_ssize_t offset; /* start of the array relative to data */ char *data; /* raw data */ int flags; /* capabilities of the base buffer */ Py_ssize_t exports; /* number of exports */ Py_buffer base; /* base buffer */ } ndbuf_t; typedef struct { PyObject_HEAD int flags; /* ndarray flags */ ndbuf_t staticbuf; /* static buffer for re-exporting mode */ ndbuf_t *head; /* currently active base buffer */ } NDArrayObject; static ndbuf_t * ndbuf_new(Py_ssize_t nitems, Py_ssize_t itemsize, Py_ssize_t offset, int flags) { ndbuf_t *ndbuf; Py_buffer *base; Py_ssize_t len; len = nitems * itemsize; if (offset % itemsize) { PyErr_SetString(PyExc_ValueError, "offset must be a multiple of itemsize"); return NULL; } if (offset < 0 || offset+itemsize > len) { PyErr_SetString(PyExc_ValueError, "offset out of bounds"); return NULL; } ndbuf = PyMem_Malloc(sizeof *ndbuf); if (ndbuf == NULL) { PyErr_NoMemory(); return NULL; } ndbuf->next = NULL; ndbuf->prev = NULL; ndbuf->len = len; ndbuf->offset= offset; ndbuf->data = PyMem_Malloc(len); if (ndbuf->data == NULL) { PyErr_NoMemory(); PyMem_Free(ndbuf); return NULL; } ndbuf->flags = flags; ndbuf->exports = 0; base = &ndbuf->base; base->obj = NULL; base->buf = ndbuf->data; base->len = len; base->itemsize = 1; base->readonly = 0; base->format = NULL; base->ndim = 1; base->shape = NULL; base->strides = NULL; base->suboffsets = NULL; base->internal = ndbuf; return ndbuf; } static void ndbuf_free(ndbuf_t *ndbuf) { Py_buffer *base = &ndbuf->base; PyMem_XFree(ndbuf->data); PyMem_XFree(base->format); PyMem_XFree(base->shape); PyMem_XFree(base->strides); PyMem_XFree(base->suboffsets); PyMem_Free(ndbuf); } static void ndbuf_push(NDArrayObject *nd, ndbuf_t *elt) { elt->next = nd->head; if (nd->head) nd->head->prev = elt; nd->head = elt; elt->prev = NULL; } static void ndbuf_delete(NDArrayObject *nd, ndbuf_t *elt) { if (elt->prev) elt->prev->next = elt->next; else nd->head = elt->next; if (elt->next) elt->next->prev = elt->prev; ndbuf_free(elt); } static void ndbuf_pop(NDArrayObject *nd) { ndbuf_delete(nd, nd->head); } static PyObject * ndarray_new(PyTypeObject *type, PyObject *args, PyObject *kwds) { NDArrayObject *nd; nd = PyObject_New(NDArrayObject, &NDArray_Type); if (nd == NULL) return NULL; nd->flags = 0; nd->head = NULL; return (PyObject *)nd; } static void ndarray_dealloc(NDArrayObject *self) { if (self->head) { if (ND_IS_CONSUMER(self)) { Py_buffer *base = &self->head->base; if (self->head->flags & ND_OWN_ARRAYS) { PyMem_XFree(base->shape); PyMem_XFree(base->strides); PyMem_XFree(base->suboffsets); } PyBuffer_Release(base); } else { while (self->head) ndbuf_pop(self); } } PyObject_Free(self); } static int ndarray_init_staticbuf(PyObject *exporter, NDArrayObject *nd, int flags) { Py_buffer *base = &nd->staticbuf.base; if (PyObject_GetBuffer(exporter, base, flags) < 0) return -1; nd->head = &nd->staticbuf; nd->head->next = NULL; nd->head->prev = NULL; nd->head->len = -1; nd->head->offset = -1; nd->head->data = NULL; nd->head->flags = base->readonly ? 0 : ND_WRITABLE; nd->head->exports = 0; return 0; } static void init_flags(ndbuf_t *ndbuf) { if (ndbuf->base.ndim == 0) ndbuf->flags |= ND_SCALAR; if (ndbuf->base.suboffsets) ndbuf->flags |= ND_PIL; if (PyBuffer_IsContiguous(&ndbuf->base, 'C')) ndbuf->flags |= ND_C; if (PyBuffer_IsContiguous(&ndbuf->base, 'F')) ndbuf->flags |= ND_FORTRAN; } /****************************************************************************/ /* Buffer/List conversions */ /****************************************************************************/ static Py_ssize_t *strides_from_shape(const ndbuf_t *, int flags); /* Get number of members in a struct: see issue #12740 */ typedef struct { PyObject_HEAD Py_ssize_t s_size; Py_ssize_t s_len; } PyPartialStructObject; static Py_ssize_t get_nmemb(PyObject *s) { return ((PyPartialStructObject *)s)->s_len; } /* Pack all items into the buffer of 'obj'. The 'format' parameter must be in struct module syntax. For standard C types, a single item is an integer. For compound types, a single item is a tuple of integers. */ static int pack_from_list(PyObject *obj, PyObject *items, PyObject *format, Py_ssize_t itemsize) { PyObject *structobj, *pack_into; PyObject *args, *offset; PyObject *item, *tmp; Py_ssize_t nitems; /* number of items */ Py_ssize_t nmemb; /* number of members in a single item */ Py_ssize_t i, j; int ret = 0; assert(PyObject_CheckBuffer(obj)); assert(PyList_Check(items) || PyTuple_Check(items)); structobj = PyObject_CallFunctionObjArgs(Struct, format, NULL); if (structobj == NULL) return -1; nitems = PySequence_Fast_GET_SIZE(items); nmemb = get_nmemb(structobj); assert(nmemb >= 1); pack_into = PyObject_GetAttrString(structobj, "pack_into"); if (pack_into == NULL) { Py_DECREF(structobj); return -1; } /* nmemb >= 1 */ args = PyTuple_New(2 + nmemb); if (args == NULL) { Py_DECREF(pack_into); Py_DECREF(structobj); return -1; } offset = NULL; for (i = 0; i < nitems; i++) { /* Loop invariant: args[j] are borrowed references or NULL. */ PyTuple_SET_ITEM(args, 0, obj); for (j = 1; j < 2+nmemb; j++) PyTuple_SET_ITEM(args, j, NULL); Py_XDECREF(offset); offset = PyLong_FromSsize_t(i*itemsize); if (offset == NULL) { ret = -1; break; } PyTuple_SET_ITEM(args, 1, offset); item = PySequence_Fast_GET_ITEM(items, i); if ((PyBytes_Check(item) || PyLong_Check(item) || PyFloat_Check(item)) && nmemb == 1) { PyTuple_SET_ITEM(args, 2, item); } else if ((PyList_Check(item) || PyTuple_Check(item)) && PySequence_Length(item) == nmemb) { for (j = 0; j < nmemb; j++) { tmp = PySequence_Fast_GET_ITEM(item, j); PyTuple_SET_ITEM(args, 2+j, tmp); } } else { PyErr_SetString(PyExc_ValueError, "mismatch between initializer element and format string"); ret = -1; break; } tmp = PyObject_CallObject(pack_into, args); if (tmp == NULL) { ret = -1; break; } Py_DECREF(tmp); } Py_INCREF(obj); /* args[0] */ /* args[1]: offset is either NULL or should be dealloc'd */ for (i = 2; i < 2+nmemb; i++) { tmp = PyTuple_GET_ITEM(args, i); Py_XINCREF(tmp); } Py_DECREF(args); Py_DECREF(pack_into); Py_DECREF(structobj); return ret; } /* Pack single element */ static int pack_single(char *ptr, PyObject *item, const char *fmt, Py_ssize_t itemsize) { PyObject *structobj = NULL, *pack_into = NULL, *args = NULL; PyObject *format = NULL, *mview = NULL, *zero = NULL; Py_ssize_t i, nmemb; int ret = -1; PyObject *x; if (fmt == NULL) fmt = "B"; format = PyUnicode_FromString(fmt); if (format == NULL) goto out; structobj = PyObject_CallFunctionObjArgs(Struct, format, NULL); if (structobj == NULL) goto out; nmemb = get_nmemb(structobj); assert(nmemb >= 1); mview = PyMemoryView_FromMemory(ptr, itemsize, PyBUF_WRITE); if (mview == NULL) goto out; zero = PyLong_FromLong(0); if (zero == NULL) goto out; pack_into = PyObject_GetAttrString(structobj, "pack_into"); if (pack_into == NULL) goto out; args = PyTuple_New(2+nmemb); if (args == NULL) goto out; PyTuple_SET_ITEM(args, 0, mview); PyTuple_SET_ITEM(args, 1, zero); if ((PyBytes_Check(item) || PyLong_Check(item) || PyFloat_Check(item)) && nmemb == 1) { PyTuple_SET_ITEM(args, 2, item); } else if ((PyList_Check(item) || PyTuple_Check(item)) && PySequence_Length(item) == nmemb) { for (i = 0; i < nmemb; i++) { x = PySequence_Fast_GET_ITEM(item, i); PyTuple_SET_ITEM(args, 2+i, x); } } else { PyErr_SetString(PyExc_ValueError, "mismatch between initializer element and format string"); goto args_out; } x = PyObject_CallObject(pack_into, args); if (x != NULL) { Py_DECREF(x); ret = 0; } args_out: for (i = 0; i < 2+nmemb; i++) Py_XINCREF(PyTuple_GET_ITEM(args, i)); Py_XDECREF(args); out: Py_XDECREF(pack_into); Py_XDECREF(zero); Py_XDECREF(mview); Py_XDECREF(structobj); Py_XDECREF(format); return ret; } static void copy_rec(const Py_ssize_t *shape, Py_ssize_t ndim, Py_ssize_t itemsize, char *dptr, const Py_ssize_t *dstrides, const Py_ssize_t *dsuboffsets, char *sptr, const Py_ssize_t *sstrides, const Py_ssize_t *ssuboffsets, char *mem) { Py_ssize_t i; assert(ndim >= 1); if (ndim == 1) { if (!HAVE_PTR(dsuboffsets) && !HAVE_PTR(ssuboffsets) && dstrides[0] == itemsize && sstrides[0] == itemsize) { memmove(dptr, sptr, shape[0] * itemsize); } else { char *p; assert(mem != NULL); for (i=0, p=mem; i<shape[0]; p+=itemsize, sptr+=sstrides[0], i++) { char *xsptr = ADJUST_PTR(sptr, ssuboffsets); memcpy(p, xsptr, itemsize); } for (i=0, p=mem; i<shape[0]; p+=itemsize, dptr+=dstrides[0], i++) { char *xdptr = ADJUST_PTR(dptr, dsuboffsets); memcpy(xdptr, p, itemsize); } } return; } for (i = 0; i < shape[0]; dptr+=dstrides[0], sptr+=sstrides[0], i++) { char *xdptr = ADJUST_PTR(dptr, dsuboffsets); char *xsptr = ADJUST_PTR(sptr, ssuboffsets); copy_rec(shape+1, ndim-1, itemsize, xdptr, dstrides+1, dsuboffsets ? dsuboffsets+1 : NULL, xsptr, sstrides+1, ssuboffsets ? ssuboffsets+1 : NULL, mem); } } static int cmp_structure(Py_buffer *dest, Py_buffer *src) { Py_ssize_t i; if (strcmp(FIX_FORMAT(dest->format), FIX_FORMAT(src->format)) != 0 || dest->itemsize != src->itemsize || dest->ndim != src->ndim) return -1; for (i = 0; i < dest->ndim; i++) { if (dest->shape[i] != src->shape[i]) return -1; if (dest->shape[i] == 0) break; } return 0; } /* Copy src to dest. Both buffers must have the same format, itemsize, ndim and shape. Copying is atomic, the function never fails with a partial copy. */ static int copy_buffer(Py_buffer *dest, Py_buffer *src) { char *mem = NULL; assert(dest->ndim > 0); if (cmp_structure(dest, src) < 0) { PyErr_SetString(PyExc_ValueError, "ndarray assignment: lvalue and rvalue have different structures"); return -1; } if ((dest->suboffsets && dest->suboffsets[dest->ndim-1] >= 0) || (src->suboffsets && src->suboffsets[src->ndim-1] >= 0) || dest->strides[dest->ndim-1] != dest->itemsize || src->strides[src->ndim-1] != src->itemsize) { mem = PyMem_Malloc(dest->shape[dest->ndim-1] * dest->itemsize); if (mem == NULL) { PyErr_NoMemory(); return -1; } } copy_rec(dest->shape, dest->ndim, dest->itemsize, dest->buf, dest->strides, dest->suboffsets, src->buf, src->strides, src->suboffsets, mem); PyMem_XFree(mem); return 0; } /* Unpack single element */ static PyObject * unpack_single(char *ptr, const char *fmt, Py_ssize_t itemsize) { PyObject *x, *unpack_from, *mview; if (fmt == NULL) { fmt = "B"; itemsize = 1; } unpack_from = PyObject_GetAttrString(structmodule, "unpack_from"); if (unpack_from == NULL) return NULL; mview = PyMemoryView_FromMemory(ptr, itemsize, PyBUF_READ); if (mview == NULL) { Py_DECREF(unpack_from); return NULL; } x = PyObject_CallFunction(unpack_from, "sO", fmt, mview); Py_DECREF(unpack_from); Py_DECREF(mview); if (x == NULL) return NULL; if (PyTuple_GET_SIZE(x) == 1) { PyObject *tmp = PyTuple_GET_ITEM(x, 0); Py_INCREF(tmp); Py_DECREF(x); return tmp; } return x; } /* Unpack a multi-dimensional matrix into a nested list. Return a scalar for ndim = 0. */ static PyObject * unpack_rec(PyObject *unpack_from, char *ptr, PyObject *mview, char *item, const Py_ssize_t *shape, const Py_ssize_t *strides, const Py_ssize_t *suboffsets, Py_ssize_t ndim, Py_ssize_t itemsize) { PyObject *lst, *x; Py_ssize_t i; assert(ndim >= 0); assert(shape != NULL); assert(strides != NULL); if (ndim == 0) { memcpy(item, ptr, itemsize); x = PyObject_CallFunctionObjArgs(unpack_from, mview, NULL); if (x == NULL) return NULL; if (PyTuple_GET_SIZE(x) == 1) { PyObject *tmp = PyTuple_GET_ITEM(x, 0); Py_INCREF(tmp); Py_DECREF(x); return tmp; } return x; } lst = PyList_New(shape[0]); if (lst == NULL) return NULL; for (i = 0; i < shape[0]; ptr+=strides[0], i++) { char *nextptr = ADJUST_PTR(ptr, suboffsets); x = unpack_rec(unpack_from, nextptr, mview, item, shape+1, strides+1, suboffsets ? suboffsets+1 : NULL, ndim-1, itemsize); if (x == NULL) { Py_DECREF(lst); return NULL; } PyList_SET_ITEM(lst, i, x); } return lst; } static PyObject * ndarray_as_list(NDArrayObject *nd) { PyObject *structobj = NULL, *unpack_from = NULL; PyObject *lst = NULL, *mview = NULL; Py_buffer *base = &nd->head->base; Py_ssize_t *shape = base->shape; Py_ssize_t *strides = base->strides; Py_ssize_t simple_shape[1]; Py_ssize_t simple_strides[1]; char *item = NULL; PyObject *format; char *fmt = base->format; base = &nd->head->base; if (fmt == NULL) { PyErr_SetString(PyExc_ValueError, "ndarray: tolist() does not support format=NULL, use " "tobytes()"); return NULL; } if (shape == NULL) { assert(ND_C_CONTIGUOUS(nd->head->flags)); assert(base->strides == NULL); assert(base->ndim <= 1); shape = simple_shape; shape[0] = base->len; strides = simple_strides; strides[0] = base->itemsize; } else if (strides == NULL) { assert(ND_C_CONTIGUOUS(nd->head->flags)); strides = strides_from_shape(nd->head, 0); if (strides == NULL) return NULL; } format = PyUnicode_FromString(fmt); if (format == NULL) goto out; structobj = PyObject_CallFunctionObjArgs(Struct, format, NULL); Py_DECREF(format); if (structobj == NULL) goto out; unpack_from = PyObject_GetAttrString(structobj, "unpack_from"); if (unpack_from == NULL) goto out; item = PyMem_Malloc(base->itemsize); if (item == NULL) { PyErr_NoMemory(); goto out; } mview = PyMemoryView_FromMemory(item, base->itemsize, PyBUF_WRITE); if (mview == NULL) goto out; lst = unpack_rec(unpack_from, base->buf, mview, item, shape, strides, base->suboffsets, base->ndim, base->itemsize); out: Py_XDECREF(mview); PyMem_XFree(item); Py_XDECREF(unpack_from); Py_XDECREF(structobj); if (strides != base->strides && strides != simple_strides) PyMem_XFree(strides); return lst; } /****************************************************************************/ /* Initialize ndbuf */ /****************************************************************************/ /* State of a new ndbuf during initialization. 'OK' means that initialization is complete. 'PTR' means that a pointer has been initialized, but the state of the memory is still undefined and ndbuf->offset is disregarded. +-----------------+-----------+-------------+----------------+ | | ndbuf_new | init_simple | init_structure | +-----------------+-----------+-------------+----------------+ | next | OK (NULL) | OK | OK | +-----------------+-----------+-------------+----------------+ | prev | OK (NULL) | OK | OK | +-----------------+-----------+-------------+----------------+ | len | OK | OK | OK | +-----------------+-----------+-------------+----------------+ | offset | OK | OK | OK | +-----------------+-----------+-------------+----------------+ | data | PTR | OK | OK | +-----------------+-----------+-------------+----------------+ | flags | user | user | OK | +-----------------+-----------+-------------+----------------+ | exports | OK (0) | OK | OK | +-----------------+-----------+-------------+----------------+ | base.obj | OK (NULL) | OK | OK | +-----------------+-----------+-------------+----------------+ | base.buf | PTR | PTR | OK | +-----------------+-----------+-------------+----------------+ | base.len | len(data) | len(data) | OK | +-----------------+-----------+-------------+----------------+ | base.itemsize | 1 | OK | OK | +-----------------+-----------+-------------+----------------+ | base.readonly | 0 | OK | OK | +-----------------+-----------+-------------+----------------+ | base.format | NULL | OK | OK | +-----------------+-----------+-------------+----------------+ | base.ndim | 1 | 1 | OK | +-----------------+-----------+-------------+----------------+ | base.shape | NULL | NULL | OK | +-----------------+-----------+-------------+----------------+ | base.strides | NULL | NULL | OK | +-----------------+-----------+-------------+----------------+ | base.suboffsets | NULL | NULL | OK | +-----------------+-----------+-------------+----------------+ | base.internal | OK | OK | OK | +-----------------+-----------+-------------+----------------+ */ static Py_ssize_t get_itemsize(PyObject *format) { PyObject *tmp; Py_ssize_t itemsize; tmp = PyObject_CallFunctionObjArgs(calcsize, format, NULL); if (tmp == NULL) return -1; itemsize = PyLong_AsSsize_t(tmp); Py_DECREF(tmp); return itemsize; } static char * get_format(PyObject *format) { PyObject *tmp; char *fmt; tmp = PyUnicode_AsASCIIString(format); if (tmp == NULL) return NULL; fmt = PyMem_Malloc(PyBytes_GET_SIZE(tmp)+1); if (fmt == NULL) { PyErr_NoMemory(); Py_DECREF(tmp); return NULL; } strcpy(fmt, PyBytes_AS_STRING(tmp)); Py_DECREF(tmp); return fmt; } static int init_simple(ndbuf_t *ndbuf, PyObject *items, PyObject *format, Py_ssize_t itemsize) { PyObject *mview; Py_buffer *base = &ndbuf->base; int ret; mview = PyMemoryView_FromBuffer(base); if (mview == NULL) return -1; ret = pack_from_list(mview, items, format, itemsize); Py_DECREF(mview); if (ret < 0) return -1; base->readonly = !(ndbuf->flags & ND_WRITABLE); base->itemsize = itemsize; base->format = get_format(format); if (base->format == NULL) return -1; return 0; } static Py_ssize_t * seq_as_ssize_array(PyObject *seq, Py_ssize_t len, int is_shape) { Py_ssize_t *dest; Py_ssize_t x, i; /* ndim = len <= ND_MAX_NDIM, so PyMem_New() is actually not needed. */ dest = PyMem_New(Py_ssize_t, len); if (dest == NULL) { PyErr_NoMemory(); return NULL; } for (i = 0; i < len; i++) { PyObject *tmp = PySequence_Fast_GET_ITEM(seq, i); if (!PyLong_Check(tmp)) { PyErr_Format(PyExc_ValueError, "elements of %s must be integers", is_shape ? "shape" : "strides"); PyMem_Free(dest); return NULL; } x = PyLong_AsSsize_t(tmp); if (PyErr_Occurred()) { PyMem_Free(dest); return NULL; } if (is_shape && x < 0) { PyErr_Format(PyExc_ValueError, "elements of shape must be integers >= 0"); PyMem_Free(dest); return NULL; } dest[i] = x; } return dest; } static Py_ssize_t * strides_from_shape(const ndbuf_t *ndbuf, int flags) { const Py_buffer *base = &ndbuf->base; Py_ssize_t *s, i; s = PyMem_Malloc(base->ndim * (sizeof *s)); if (s == NULL) { PyErr_NoMemory(); return NULL; } if (flags & ND_FORTRAN) { s[0] = base->itemsize; for (i = 1; i < base->ndim; i++) s[i] = s[i-1] * base->shape[i-1]; } else { s[base->ndim-1] = base->itemsize; for (i = base->ndim-2; i >= 0; i--) s[i] = s[i+1] * base->shape[i+1]; } return s; } /* Bounds check: len := complete length of allocated memory offset := start of the array A single array element is indexed by: i = indices[0] * strides[0] + indices[1] * strides[1] + ... imin is reached when all indices[n] combined with positive strides are 0 and all indices combined with negative strides are shape[n]-1, which is the maximum index for the nth dimension. imax is reached when all indices[n] combined with negative strides are 0 and all indices combined with positive strides are shape[n]-1. */ static int verify_structure(Py_ssize_t len, Py_ssize_t itemsize, Py_ssize_t offset, const Py_ssize_t *shape, const Py_ssize_t *strides, Py_ssize_t ndim) { Py_ssize_t imin, imax; Py_ssize_t n; assert(ndim >= 0); if (ndim == 0 && (offset < 0 || offset+itemsize > len)) goto invalid_combination; for (n = 0; n < ndim; n++) if (strides[n] % itemsize) { PyErr_SetString(PyExc_ValueError, "strides must be a multiple of itemsize"); return -1; } for (n = 0; n < ndim; n++) if (shape[n] == 0) return 0; imin = imax = 0; for (n = 0; n < ndim; n++) if (strides[n] <= 0) imin += (shape[n]-1) * strides[n]; else imax += (shape[n]-1) * strides[n]; if (imin + offset < 0 || imax + offset + itemsize > len) goto invalid_combination; return 0; invalid_combination: PyErr_SetString(PyExc_ValueError, "invalid combination of buffer, shape and strides"); return -1; } /* Convert a NumPy-style array to an array using suboffsets to stride in the first dimension. Requirements: ndim > 0. Contiguous example ================== Input: ------ shape = {2, 2, 3}; strides = {6, 3, 1}; suboffsets = NULL; data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; buf = &data[0] Output: ------- shape = {2, 2, 3}; strides = {sizeof(char *), 3, 1}; suboffsets = {0, -1, -1}; data = {p1, p2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; | | ^ ^ `---'---' | | | `---------------------' buf = &data[0] So, in the example the input resembles the three-dimensional array char v[2][2][3], while the output resembles an array of two pointers to two-dimensional arrays: char (*v[2])[2][3]. Non-contiguous example: |
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