GeezerVisonThe World Wide Web, restored to 800 pixels of glory. |
| Home|About|Gaming cabinet|Archives|How it works|Starter sites |
GeezerVison is showing github.com — cpython/Python/marshal.c at 3.6 · python/cpython Expand file tree/ Copy pathmarshal.cMore file actions 1861 lines (1724 loc) · 50.3 KB / Copy pathmarshal.cFile metadata and controls1861 lines (1724 loc) · 50.3 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 /* Write Python objects to files and read them back. This is primarily intended for writing and reading compiled Python code, even though dicts, lists, sets and frozensets, not commonly seen in code objects, are supported. Version 3 of this protocol properly supports circular links and sharing. */ #define PY_SSIZE_T_CLEAN #include "Python.h" #include "longintrepr.h" #include "code.h" #include "marshal.h" #include "../Modules/hashtable.h" /* High water mark to determine when the marshalled object is dangerously deep * and risks coring the interpreter. When the object stack gets this deep, * raise an exception instead of continuing. * On Windows debug builds, reduce this value. */ #if defined(MS_WINDOWS) && defined(_DEBUG) #define MAX_MARSHAL_STACK_DEPTH 1000 #else #define MAX_MARSHAL_STACK_DEPTH 2000 #endif #define TYPE_NULL '0' #define TYPE_NONE 'N' #define TYPE_FALSE 'F' #define TYPE_TRUE 'T' #define TYPE_STOPITER 'S' #define TYPE_ELLIPSIS '.' #define TYPE_INT 'i' /* TYPE_INT64 is not generated anymore. Supported for backward compatibility only. */ #define TYPE_INT64 'I' #define TYPE_FLOAT 'f' #define TYPE_BINARY_FLOAT 'g' #define TYPE_COMPLEX 'x' #define TYPE_BINARY_COMPLEX 'y' #define TYPE_LONG 'l' #define TYPE_STRING 's' #define TYPE_INTERNED 't' #define TYPE_REF 'r' #define TYPE_TUPLE '(' #define TYPE_LIST '[' #define TYPE_DICT '{' #define TYPE_CODE 'c' #define TYPE_UNICODE 'u' #define TYPE_UNKNOWN '?' #define TYPE_SET '<' #define TYPE_FROZENSET '>' #define FLAG_REF '\x80' /* with a type, add obj to index */ #define TYPE_ASCII 'a' #define TYPE_ASCII_INTERNED 'A' #define TYPE_SMALL_TUPLE ')' #define TYPE_SHORT_ASCII 'z' #define TYPE_SHORT_ASCII_INTERNED 'Z' #define WFERR_OK 0 #define WFERR_UNMARSHALLABLE 1 #define WFERR_NESTEDTOODEEP 2 #define WFERR_NOMEMORY 3 typedef struct { FILE *fp; int error; /* see WFERR_* values */ int depth; PyObject *str; char *ptr; char *end; char *buf; _Py_hashtable_t *hashtable; int version; } WFILE; #define w_byte(c, p) do { \ if ((p)->ptr != (p)->end || w_reserve((p), 1)) \ *(p)->ptr++ = (c); \ } while(0) static void w_flush(WFILE *p) { assert(p->fp != NULL); fwrite(p->buf, 1, p->ptr - p->buf, p->fp); p->ptr = p->buf; } static int w_reserve(WFILE *p, Py_ssize_t needed) { Py_ssize_t pos, size, delta; if (p->ptr == NULL) return 0; /* An error already occurred */ if (p->fp != NULL) { w_flush(p); return needed <= p->end - p->ptr; } assert(p->str != NULL); pos = p->ptr - p->buf; size = PyBytes_Size(p->str); if (size > 16*1024*1024) delta = (size >> 3); /* 12.5% overallocation */ else delta = size + 1024; delta = Py_MAX(delta, needed); if (delta > PY_SSIZE_T_MAX - size) { p->error = WFERR_NOMEMORY; return 0; } size += delta; if (_PyBytes_Resize(&p->str, size) != 0) { p->ptr = p->buf = p->end = NULL; return 0; } else { p->buf = PyBytes_AS_STRING(p->str); p->ptr = p->buf + pos; p->end = p->buf + size; return 1; } } static void w_string(const char *s, Py_ssize_t n, WFILE *p) { Py_ssize_t m; if (!n || p->ptr == NULL) return; m = p->end - p->ptr; if (p->fp != NULL) { if (n <= m) { memcpy(p->ptr, s, n); p->ptr += n; } else { w_flush(p); fwrite(s, 1, n, p->fp); } } else { if (n <= m || w_reserve(p, n - m)) { memcpy(p->ptr, s, n); p->ptr += n; } } } static void w_short(int x, WFILE *p) { w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); } static void w_long(long x, WFILE *p) { w_byte((char)( x & 0xff), p); w_byte((char)((x>> 8) & 0xff), p); w_byte((char)((x>>16) & 0xff), p); w_byte((char)((x>>24) & 0xff), p); } #define SIZE32_MAX 0x7FFFFFFF #if SIZEOF_SIZE_T > 4 # define W_SIZE(n, p) do { \ if ((n) > SIZE32_MAX) { \ (p)->depth--; \ (p)->error = WFERR_UNMARSHALLABLE; \ return; \ } \ w_long((long)(n), p); \ } while(0) #else # define W_SIZE w_long #endif static void w_pstring(const char *s, Py_ssize_t n, WFILE *p) { W_SIZE(n, p); w_string(s, n, p); } static void w_short_pstring(const char *s, Py_ssize_t n, WFILE *p) { w_byte(Py_SAFE_DOWNCAST(n, Py_ssize_t, unsigned char), p); w_string(s, n, p); } /* We assume that Python ints are stored internally in base some power of 2**15; for the sake of portability we'll always read and write them in base exactly 2**15. */ #define PyLong_MARSHAL_SHIFT 15 #define PyLong_MARSHAL_BASE ((short)1 << PyLong_MARSHAL_SHIFT) #define PyLong_MARSHAL_MASK (PyLong_MARSHAL_BASE - 1) #if PyLong_SHIFT % PyLong_MARSHAL_SHIFT != 0 #error "PyLong_SHIFT must be a multiple of PyLong_MARSHAL_SHIFT" #endif #define PyLong_MARSHAL_RATIO (PyLong_SHIFT / PyLong_MARSHAL_SHIFT) #define W_TYPE(t, p) do { \ w_byte((t) | flag, (p)); \ } while(0) static void w_PyLong(const PyLongObject *ob, char flag, WFILE *p) { Py_ssize_t i, j, n, l; digit d; W_TYPE(TYPE_LONG, p); if (Py_SIZE(ob) == 0) { w_long((long)0, p); return; } /* set l to number of base PyLong_MARSHAL_BASE digits */ n = Py_ABS(Py_SIZE(ob)); l = (n-1) * PyLong_MARSHAL_RATIO; d = ob->ob_digit[n-1]; assert(d != 0); /* a PyLong is always normalized */ do { d >>= PyLong_MARSHAL_SHIFT; l++; } while (d != 0); if (l > SIZE32_MAX) { p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } w_long((long)(Py_SIZE(ob) > 0 ? l : -l), p); for (i=0; i < n-1; i++) { d = ob->ob_digit[i]; for (j=0; j < PyLong_MARSHAL_RATIO; j++) { w_short(d & PyLong_MARSHAL_MASK, p); d >>= PyLong_MARSHAL_SHIFT; } assert (d == 0); } d = ob->ob_digit[n-1]; do { w_short(d & PyLong_MARSHAL_MASK, p); d >>= PyLong_MARSHAL_SHIFT; } while (d != 0); } static int w_ref(PyObject *v, char *flag, WFILE *p) { _Py_hashtable_entry_t *entry; int w; if (p->version < 3 || p->hashtable == NULL) return 0; /* not writing object references */ /* if it has only one reference, it definitely isn't shared */ if (Py_REFCNT(v) == 1) return 0; entry = _Py_HASHTABLE_GET_ENTRY(p->hashtable, v); if (entry != NULL) { /* write the reference index to the stream */ _Py_HASHTABLE_ENTRY_READ_DATA(p->hashtable, entry, w); /* we don't store "long" indices in the dict */ assert(0 <= w && w <= 0x7fffffff); w_byte(TYPE_REF, p); w_long(w, p); return 1; } else { size_t s = p->hashtable->entries; /* we don't support long indices */ if (s >= 0x7fffffff) { PyErr_SetString(PyExc_ValueError, "too many objects"); goto err; } w = (int)s; Py_INCREF(v); if (_Py_HASHTABLE_SET(p->hashtable, v, w) < 0) { Py_DECREF(v); goto err; } *flag |= FLAG_REF; return 0; } err: p->error = WFERR_UNMARSHALLABLE; return 1; } static void w_complex_object(PyObject *v, char flag, WFILE *p); static void w_object(PyObject *v, WFILE *p) { char flag = '\0'; p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->error = WFERR_NESTEDTOODEEP; } else if (v == NULL) { w_byte(TYPE_NULL, p); } else if (v == Py_None) { w_byte(TYPE_NONE, p); } else if (v == PyExc_StopIteration) { w_byte(TYPE_STOPITER, p); } else if (v == Py_Ellipsis) { w_byte(TYPE_ELLIPSIS, p); } else if (v == Py_False) { w_byte(TYPE_FALSE, p); } else if (v == Py_True) { w_byte(TYPE_TRUE, p); } else if (!w_ref(v, &flag, p)) w_complex_object(v, flag, p); p->depth--; } static void w_complex_object(PyObject *v, char flag, WFILE *p) { Py_ssize_t i, n; if (PyLong_CheckExact(v)) { long x = PyLong_AsLong(v); if ((x == -1) && PyErr_Occurred()) { PyLongObject *ob = (PyLongObject *)v; PyErr_Clear(); w_PyLong(ob, flag, p); } else { #if SIZEOF_LONG > 4 long y = Py_ARITHMETIC_RIGHT_SHIFT(long, x, 31); if (y && y != -1) { /* Too large for TYPE_INT */ w_PyLong((PyLongObject*)v, flag, p); } else #endif { W_TYPE(TYPE_INT, p); w_long(x, p); } } } else if (PyFloat_CheckExact(v)) { if (p->version > 1) { unsigned char buf[8]; if (_PyFloat_Pack8(PyFloat_AsDouble(v), buf, 1) < 0) { p->error = WFERR_UNMARSHALLABLE; return; } W_TYPE(TYPE_BINARY_FLOAT, p); w_string((char*)buf, 8, p); } else { char *buf = PyOS_double_to_string(PyFloat_AS_DOUBLE(v), 'g', 17, 0, NULL); if (!buf) { p->error = WFERR_NOMEMORY; return; } n = strlen(buf); W_TYPE(TYPE_FLOAT, p); w_byte((int)n, p); w_string(buf, n, p); PyMem_Free(buf); } } else if (PyComplex_CheckExact(v)) { if (p->version > 1) { unsigned char buf[8]; if (_PyFloat_Pack8(PyComplex_RealAsDouble(v), buf, 1) < 0) { p->error = WFERR_UNMARSHALLABLE; return; } W_TYPE(TYPE_BINARY_COMPLEX, p); w_string((char*)buf, 8, p); if (_PyFloat_Pack8(PyComplex_ImagAsDouble(v), buf, 1) < 0) { p->error = WFERR_UNMARSHALLABLE; return; } w_string((char*)buf, 8, p); } else { char *buf; W_TYPE(TYPE_COMPLEX, p); buf = PyOS_double_to_string(PyComplex_RealAsDouble(v), 'g', 17, 0, NULL); if (!buf) { p->error = WFERR_NOMEMORY; return; } n = strlen(buf); w_byte((int)n, p); w_string(buf, n, p); PyMem_Free(buf); buf = PyOS_double_to_string(PyComplex_ImagAsDouble(v), 'g', 17, 0, NULL); if (!buf) { p->error = WFERR_NOMEMORY; return; } n = strlen(buf); w_byte((int)n, p); w_string(buf, n, p); PyMem_Free(buf); } } else if (PyBytes_CheckExact(v)) { W_TYPE(TYPE_STRING, p); w_pstring(PyBytes_AS_STRING(v), PyBytes_GET_SIZE(v), p); } else if (PyUnicode_CheckExact(v)) { if (p->version >= 4 && PyUnicode_IS_ASCII(v)) { int is_short = PyUnicode_GET_LENGTH(v) < 256; if (is_short) { if (PyUnicode_CHECK_INTERNED(v)) W_TYPE(TYPE_SHORT_ASCII_INTERNED, p); else W_TYPE(TYPE_SHORT_ASCII, p); w_short_pstring((char *) PyUnicode_1BYTE_DATA(v), PyUnicode_GET_LENGTH(v), p); } else { if (PyUnicode_CHECK_INTERNED(v)) W_TYPE(TYPE_ASCII_INTERNED, p); else W_TYPE(TYPE_ASCII, p); w_pstring((char *) PyUnicode_1BYTE_DATA(v), PyUnicode_GET_LENGTH(v), p); } } else { PyObject *utf8; utf8 = PyUnicode_AsEncodedString(v, "utf8", "surrogatepass"); if (utf8 == NULL) { p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } if (p->version >= 3 && PyUnicode_CHECK_INTERNED(v)) W_TYPE(TYPE_INTERNED, p); else W_TYPE(TYPE_UNICODE, p); w_pstring(PyBytes_AS_STRING(utf8), PyBytes_GET_SIZE(utf8), p); Py_DECREF(utf8); } } else if (PyTuple_CheckExact(v)) { n = PyTuple_Size(v); if (p->version >= 4 && n < 256) { W_TYPE(TYPE_SMALL_TUPLE, p); w_byte((unsigned char)n, p); } else { W_TYPE(TYPE_TUPLE, p); W_SIZE(n, p); } for (i = 0; i < n; i++) { w_object(PyTuple_GET_ITEM(v, i), p); } } else if (PyList_CheckExact(v)) { W_TYPE(TYPE_LIST, p); n = PyList_GET_SIZE(v); W_SIZE(n, p); for (i = 0; i < n; i++) { w_object(PyList_GET_ITEM(v, i), p); } } else if (PyDict_CheckExact(v)) { Py_ssize_t pos; PyObject *key, *value; W_TYPE(TYPE_DICT, p); /* This one is NULL object terminated! */ pos = 0; while (PyDict_Next(v, &pos, &key, &value)) { w_object(key, p); w_object(value, p); } w_object((PyObject *)NULL, p); } else if (PyAnySet_CheckExact(v)) { PyObject *value, *it; if (PyObject_TypeCheck(v, &PySet_Type)) W_TYPE(TYPE_SET, p); else W_TYPE(TYPE_FROZENSET, p); n = PyObject_Size(v); if (n == -1) { p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } W_SIZE(n, p); it = PyObject_GetIter(v); if (it == NULL) { p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } while ((value = PyIter_Next(it)) != NULL) { w_object(value, p); Py_DECREF(value); } Py_DECREF(it); if (PyErr_Occurred()) { p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } } else if (PyCode_Check(v)) { PyCodeObject *co = (PyCodeObject *)v; W_TYPE(TYPE_CODE, p); w_long(co->co_argcount, p); w_long(co->co_kwonlyargcount, p); w_long(co->co_nlocals, p); w_long(co->co_stacksize, p); w_long(co->co_flags, p); w_object(co->co_code, p); w_object(co->co_consts, p); w_object(co->co_names, p); w_object(co->co_varnames, p); w_object(co->co_freevars, p); w_object(co->co_cellvars, p); w_object(co->co_filename, p); w_object(co->co_name, p); w_long(co->co_firstlineno, p); w_object(co->co_lnotab, p); } else if (PyObject_CheckBuffer(v)) { /* Write unknown bytes-like objects as a bytes object */ Py_buffer view; if (PyObject_GetBuffer(v, &view, PyBUF_SIMPLE) != 0) { w_byte(TYPE_UNKNOWN, p); p->depth--; p->error = WFERR_UNMARSHALLABLE; return; } W_TYPE(TYPE_STRING, p); w_pstring(view.buf, view.len, p); PyBuffer_Release(&view); } else { W_TYPE(TYPE_UNKNOWN, p); p->error = WFERR_UNMARSHALLABLE; } } static int w_init_refs(WFILE *wf, int version) { if (version >= 3) { wf->hashtable = _Py_hashtable_new(sizeof(PyObject *), sizeof(int), _Py_hashtable_hash_ptr, _Py_hashtable_compare_direct); if (wf->hashtable == NULL) { PyErr_NoMemory(); return -1; } } return 0; } static int w_decref_entry(_Py_hashtable_t *ht, _Py_hashtable_entry_t *entry, void *Py_UNUSED(data)) { PyObject *entry_key; _Py_HASHTABLE_ENTRY_READ_KEY(ht, entry, entry_key); Py_XDECREF(entry_key); return 0; } static void w_clear_refs(WFILE *wf) { if (wf->hashtable != NULL) { _Py_hashtable_foreach(wf->hashtable, w_decref_entry, NULL); _Py_hashtable_destroy(wf->hashtable); } } /* version currently has no effect for writing ints. */ void PyMarshal_WriteLongToFile(long x, FILE *fp, int version) { char buf[4]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; w_long(x, &wf); w_flush(&wf); } void PyMarshal_WriteObjectToFile(PyObject *x, FILE *fp, int version) { char buf[BUFSIZ]; WFILE wf; memset(&wf, 0, sizeof(wf)); wf.fp = fp; wf.ptr = wf.buf = buf; wf.end = wf.ptr + sizeof(buf); wf.error = WFERR_OK; wf.version = version; if (w_init_refs(&wf, version)) return; /* caller mush check PyErr_Occurred() */ w_object(x, &wf); w_clear_refs(&wf); w_flush(&wf); } typedef struct { FILE *fp; int depth; PyObject *readable; /* Stream-like object being read from */ PyObject *current_filename; char *ptr; char *end; char *buf; Py_ssize_t buf_size; PyObject *refs; /* a list */ } RFILE; static const char * r_string(Py_ssize_t n, RFILE *p) { Py_ssize_t read = -1; if (p->ptr != NULL) { /* Fast path for loads() */ char *res = p->ptr; Py_ssize_t left = p->end - p->ptr; if (left < n) { PyErr_SetString(PyExc_EOFError, "marshal data too short"); return NULL; } p->ptr += n; return res; } if (p->buf == NULL) { p->buf = PyMem_MALLOC(n); if (p->buf == NULL) { PyErr_NoMemory(); return NULL; } p->buf_size = n; } else if (p->buf_size < n) { char *tmp = PyMem_REALLOC(p->buf, n); if (tmp == NULL) { PyErr_NoMemory(); return NULL; } p->buf = tmp; p->buf_size = n; } if (!p->readable) { assert(p->fp != NULL); read = fread(p->buf, 1, n, p->fp); } else { _Py_IDENTIFIER(readinto); PyObject *res, *mview; Py_buffer buf; if (PyBuffer_FillInfo(&buf, NULL, p->buf, n, 0, PyBUF_CONTIG) == -1) return NULL; mview = PyMemoryView_FromBuffer(&buf); if (mview == NULL) return NULL; res = _PyObject_CallMethodId(p->readable, &PyId_readinto, "N", mview); if (res != NULL) { read = PyNumber_AsSsize_t(res, PyExc_ValueError); Py_DECREF(res); } } if (read != n) { if (!PyErr_Occurred()) { if (read > n) PyErr_Format(PyExc_ValueError, "read() returned too much data: " "%zd bytes requested, %zd returned", n, read); else PyErr_SetString(PyExc_EOFError, "EOF read where not expected"); } return NULL; } return p->buf; } static int r_byte(RFILE *p) { int c = EOF; if (p->ptr != NULL) { if (p->ptr < p->end) c = (unsigned char) *p->ptr++; return c; } if (!p->readable) { assert(p->fp); c = getc(p->fp); } else { const char *ptr = r_string(1, p); if (ptr != NULL) c = *(unsigned char *) ptr; } return c; } static int r_short(RFILE *p) { short x = -1; const unsigned char *buffer; buffer = (const unsigned char *) r_string(2, p); if (buffer != NULL) { x = buffer[0]; x |= buffer[1] << 8; /* Sign-extension, in case short greater than 16 bits */ x |= -(x & 0x8000); } return x; } static long r_long(RFILE *p) { long x = -1; const unsigned char *buffer; buffer = (const unsigned char *) r_string(4, p); if (buffer != NULL) { x = buffer[0]; x |= (long)buffer[1] << 8; x |= (long)buffer[2] << 16; x |= (long)buffer[3] << 24; #if SIZEOF_LONG > 4 /* Sign extension for 64-bit machines */ x |= -(x & 0x80000000L); #endif } return x; } /* r_long64 deals with the TYPE_INT64 code. */ static PyObject * r_long64(RFILE *p) { const unsigned char *buffer = (const unsigned char *) r_string(8, p); if (buffer == NULL) { return NULL; } return _PyLong_FromByteArray(buffer, 8, 1 /* little endian */, 1 /* signed */); } static PyObject * r_PyLong(RFILE *p) { PyLongObject *ob; long n, size, i; int j, md, shorts_in_top_digit; digit d; n = r_long(p); if (PyErr_Occurred()) return NULL; if (n == 0) return (PyObject *)_PyLong_New(0); if (n < -SIZE32_MAX || n > SIZE32_MAX) { PyErr_SetString(PyExc_ValueError, "bad marshal data (long size out of range)"); return NULL; } size = 1 + (Py_ABS(n) - 1) / PyLong_MARSHAL_RATIO; shorts_in_top_digit = 1 + (Py_ABS(n) - 1) % PyLong_MARSHAL_RATIO; ob = _PyLong_New(size); if (ob == NULL) return NULL; Py_SIZE(ob) = n > 0 ? size : -size; for (i = 0; i < size-1; i++) { d = 0; for (j=0; j < PyLong_MARSHAL_RATIO; j++) { md = r_short(p); if (PyErr_Occurred()) { Py_DECREF(ob); return NULL; } if (md < 0 || md > PyLong_MARSHAL_BASE) goto bad_digit; d += (digit)md << j*PyLong_MARSHAL_SHIFT; } ob->ob_digit[i] = d; } d = 0; for (j=0; j < shorts_in_top_digit; j++) { md = r_short(p); if (PyErr_Occurred()) { Py_DECREF(ob); return NULL; } if (md < 0 || md > PyLong_MARSHAL_BASE) goto bad_digit; /* topmost marshal digit should be nonzero */ if (md == 0 && j == shorts_in_top_digit - 1) { Py_DECREF(ob); PyErr_SetString(PyExc_ValueError, "bad marshal data (unnormalized long data)"); return NULL; } d += (digit)md << j*PyLong_MARSHAL_SHIFT; } if (PyErr_Occurred()) { Py_DECREF(ob); return NULL; } /* top digit should be nonzero, else the resulting PyLong won't be normalized */ ob->ob_digit[size-1] = d; return (PyObject *)ob; bad_digit: Py_DECREF(ob); PyErr_SetString(PyExc_ValueError, "bad marshal data (digit out of range in long)"); return NULL; } /* allocate the reflist index for a new object. Return -1 on failure */ static Py_ssize_t r_ref_reserve(int flag, RFILE *p) { if (flag) { /* currently only FLAG_REF is defined */ Py_ssize_t idx = PyList_GET_SIZE(p->refs); if (idx >= 0x7ffffffe) { PyErr_SetString(PyExc_ValueError, "bad marshal data (index list too large)"); return -1; } if (PyList_Append(p->refs, Py_None) < 0) return -1; return idx; } else return 0; } /* insert the new object 'o' to the reflist at previously * allocated index 'idx'. * 'o' can be NULL, in which case nothing is done. * if 'o' was non-NULL, and the function succeeds, 'o' is returned. * if 'o' was non-NULL, and the function fails, 'o' is released and * NULL returned. This simplifies error checking at the call site since * a single test for NULL for the function result is enough. */ static PyObject * r_ref_insert(PyObject *o, Py_ssize_t idx, int flag, RFILE *p) { if (o != NULL && flag) { /* currently only FLAG_REF is defined */ PyObject *tmp = PyList_GET_ITEM(p->refs, idx); Py_INCREF(o); PyList_SET_ITEM(p->refs, idx, o); Py_DECREF(tmp); } return o; } /* combination of both above, used when an object can be * created whenever it is seen in the file, as opposed to * after having loaded its sub-objects. */ static PyObject * r_ref(PyObject *o, int flag, RFILE *p) { assert(flag & FLAG_REF); if (o == NULL) return NULL; if (PyList_Append(p->refs, o) < 0) { Py_DECREF(o); /* release the new object */ return NULL; } return o; } static PyObject * r_object(RFILE *p) { /* NULL is a valid return value, it does not necessarily means that an exception is set. */ PyObject *v, *v2; Py_ssize_t idx = 0; long i, n; int type, code = r_byte(p); int flag, is_interned = 0; PyObject *retval = NULL; if (code == EOF) { PyErr_SetString(PyExc_EOFError, "EOF read where object expected"); return NULL; } p->depth++; if (p->depth > MAX_MARSHAL_STACK_DEPTH) { p->depth--; PyErr_SetString(PyExc_ValueError, "recursion limit exceeded"); return NULL; } flag = code & FLAG_REF; type = code & ~FLAG_REF; #define R_REF(O) do{\ if (flag) \ O = r_ref(O, flag, p);\ } while (0) switch (type) { case TYPE_NULL: break; case TYPE_NONE: Py_INCREF(Py_None); retval = Py_None; break; case TYPE_STOPITER: Py_INCREF(PyExc_StopIteration); retval = PyExc_StopIteration; break; case TYPE_ELLIPSIS: Py_INCREF(Py_Ellipsis); retval = Py_Ellipsis; break; case TYPE_FALSE: Py_INCREF(Py_False); retval = Py_False; break; case TYPE_TRUE: Py_INCREF(Py_True); retval = Py_True; break; case TYPE_INT: n = r_long(p); retval = PyErr_Occurred() ? NULL : PyLong_FromLong(n); R_REF(retval); break; case TYPE_INT64: retval = r_long64(p); R_REF(retval); break; |
| You are visitor 01402520 — GeezerVison does not store the pages you look up. Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required. |