#ifndef Py_MODSUPPORT_H #define Py_MODSUPPORT_H #ifdef __cplusplus extern "C" { #endif /* Module support interface */ #include /* If PY_SSIZE_T_CLEAN is defined, each functions treats #-specifier to mean Py_ssize_t */ #ifdef PY_SSIZE_T_CLEAN #define PyArg_Parse _PyArg_Parse_SizeT #define PyArg_ParseTuple _PyArg_ParseTuple_SizeT #define PyArg_ParseTupleAndKeywords _PyArg_ParseTupleAndKeywords_SizeT #define PyArg_VaParse _PyArg_VaParse_SizeT #define PyArg_VaParseTupleAndKeywords _PyArg_VaParseTupleAndKeywords_SizeT #define Py_BuildValue _Py_BuildValue_SizeT #define Py_VaBuildValue _Py_VaBuildValue_SizeT #ifndef Py_LIMITED_API #define _Py_VaBuildStack _Py_VaBuildStack_SizeT #endif #else #ifndef Py_LIMITED_API PyAPI_FUNC(PyObject *) _Py_VaBuildValue_SizeT(const char *, va_list); PyAPI_FUNC(PyObject **) _Py_VaBuildStack_SizeT( PyObject **small_stack, Py_ssize_t small_stack_len, const char *format, va_list va, Py_ssize_t *p_nargs); #endif /* !Py_LIMITED_API */ #endif /* Due to a glitch in 3.2, the _SizeT versions weren't exported from the DLL. */ #if !defined(PY_SSIZE_T_CLEAN) || !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000 PyAPI_FUNC(int) PyArg_Parse(PyObject *, const char *, ...); PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...); PyAPI_FUNC(int) PyArg_ParseTupleAndKeywords(PyObject *, PyObject *, const char *, char **, ...); PyAPI_FUNC(int) PyArg_VaParse(PyObject *, const char *, va_list); PyAPI_FUNC(int) PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *, const char *, char **, va_list); #endif PyAPI_FUNC(int) PyArg_ValidateKeywordArguments(PyObject *); PyAPI_FUNC(int) PyArg_UnpackTuple(PyObject *, const char *, Py_ssize_t, Py_ssize_t, ...); PyAPI_FUNC(PyObject *) Py_BuildValue(const char *, ...); PyAPI_FUNC(PyObject *) _Py_BuildValue_SizeT(const char *, ...); #ifndef Py_LIMITED_API PyAPI_FUNC(int) _PyArg_UnpackStack( PyObject *const *args, Py_ssize_t nargs, const char *name, Py_ssize_t min, Py_ssize_t max, ...); PyAPI_FUNC(int) _PyArg_NoKeywords(const char *funcname, PyObject *kwargs); PyAPI_FUNC(int) _PyArg_NoKwnames(const char *funcname, PyObject *kwnames); PyAPI_FUNC(int) _PyArg_NoPositional(const char *funcname, PyObject *args); #define _PyArg_NoKeywords(funcname, kwargs) \ ((kwargs) == NULL || _PyArg_NoKeywords((funcname), (kwargs))) #define _PyArg_NoKwnames(funcname, kwnames) \ ((kwnames) == NULL || _PyArg_NoKwnames((funcname), (kwnames))) #define _PyArg_NoPositional(funcname, args) \ ((args) == NULL || _PyArg_NoPositional((funcname), (args))) PyAPI_FUNC(void) _PyArg_BadArgument(const char *, const char *, const char *, PyObject *); PyAPI_FUNC(int) _PyArg_CheckPositional(const char *, Py_ssize_t, Py_ssize_t, Py_ssize_t); #define _PyArg_CheckPositional(funcname, nargs, min, max) \ (((min) <= (nargs) && (nargs) <= (max)) \ || _PyArg_CheckPositional((funcname), (nargs), (min), (max))) #endif PyAPI_FUNC(PyObject *) Py_VaBuildValue(const char *, va_list); #ifndef Py_LIMITED_API PyAPI_FUNC(PyObject **) _Py_VaBuildStack( PyObject **small_stack, Py_ssize_t small_stack_len, const char *format, va_list va, Py_ssize_t *p_nargs); #endif #ifndef Py_LIMITED_API typedef struct _PyArg_Parser { const char *format; const char * const *keywords; const char *fname; const char *custom_msg; int pos; /* number of positional-only arguments */ int min; /* minimal number of arguments */ int max; /* maximal number of positional arguments */ PyObject *kwtuple; /* tuple of keyword parameter names */ struct _PyArg_Parser *next; } _PyArg_Parser; #ifdef PY_SSIZE_T_CLEAN #define _PyArg_ParseTupleAndKeywordsFast _PyArg_ParseTupleAndKeywordsFast_SizeT #define _PyArg_ParseStack _PyArg_ParseStack_SizeT #define _PyArg_ParseStackAndKeywords _PyArg_ParseStackAndKeywords_SizeT #define _PyArg_VaParseTupleAndKeywordsFast _PyArg_VaParseTupleAndKeywordsFast_SizeT #endif PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywordsFast(PyObject *, PyObject *, struct _PyArg_Parser *, ...); PyAPI_FUNC(int) _PyArg_ParseStack( PyObject *const *args, Py_ssize_t nargs, const char *format, ...); PyAPI_FUNC(int) _PyArg_ParseStackAndKeywords( PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames, struct _PyArg_Parser *, ...); PyAPI_FUNC(int) _PyArg_VaParseTupleAndKeywordsFast(PyObject *, PyObject *, struct _PyArg_Parser *, va_list); PyAPI_FUNC(PyObject * const *) _PyArg_UnpackKeywords( PyObject *const *args, Py_ssize_t nargs, PyObject *kwargs, PyObject *kwnames, struct _PyArg_Parser *parser, int minpos, int maxpos, int minkw, PyObject **buf); #define _PyArg_UnpackKeywords(args, nargs, kwargs, kwnames, parser, minpos, maxpos, minkw, buf) \ (((minkw) == 0 && (kwargs) == NULL && (kwnames) == NULL && \ (minpos) <= (nargs) && (nargs) <= (maxpos) && args != NULL) ? (args) : \ _PyArg_UnpackKeywords((args), (nargs), (kwargs), (kwnames), (parser), \ (minpos), (maxpos), (minkw), (buf))) void _PyArg_Fini(void); #endif /* Py_LIMITED_API */ // Add an attribute with name 'name' and value 'obj' to the module 'mod. // On success, return 0 on success. // On error, raise an exception and return -1. PyAPI_FUNC(int) PyModule_AddObjectRef(PyObject *mod, const char *name, PyObject *value); // Similar to PyModule_AddObjectRef() but steal a reference to 'obj' // (Py_DECREF(obj)) on success (if it returns 0). PyAPI_FUNC(int) PyModule_AddObject(PyObject *mod, const char *, PyObject *value); PyAPI_FUNC(int) PyModule_AddIntConstant(PyObject *, const char *, long); PyAPI_FUNC(int) PyModule_AddStringConstant(PyObject *, const char *, const char *); #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03090000 /* New in 3.9 */ PyAPI_FUNC(int) PyModule_AddType(PyObject *module, PyTypeObject *type); #endif /* Py_LIMITED_API */ #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c) #define PyModule_AddStringMacro(m, c) PyModule_AddStringConstant(m, #c, c) #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000 /* New in 3.5 */ PyAPI_FUNC(int) PyModule_SetDocString(PyObject *, const char *); PyAPI_FUNC(int) PyModule_AddFunctions(PyObject *, PyMethodDef *); PyAPI_FUNC(int) PyModule_ExecDef(PyObject *module, PyModuleDef *def); #endif #define Py_CLEANUP_SUPPORTED 0x20000 #define PYTHON_API_VERSION 1013 #define PYTHON_API_STRING "1013" /* The API version is maintained (independently from the Python version) so we can detect mismatches between the interpreter and dynamically loaded modules. These are diagnosed by an error message but the module is still loaded (because the mismatch can only be tested after loading the module). The error message is intended to explain the core dump a few seconds later. The symbol PYTHON_API_STRING defines the same value as a string literal. *** PLEASE MAKE SURE THE DEFINITIONS MATCH. *** Please add a line or two to the top of this log for each API version change: 22-Feb-2006 MvL 1013 PEP 353 - long indices for sequence lengths 19-Aug-2002 GvR 1012 Changes to string object struct for interning changes, saving 3 bytes. 17-Jul-2001 GvR 1011 Descr-branch, just to be on the safe side 25-Jan-2001 FLD 1010 Parameters added to PyCode_New() and PyFrame_New(); Python 2.1a2 14-Mar-2000 GvR 1009 Unicode API added 3-Jan-1999 GvR 1007 Decided to change back! (Don't reuse 1008!) 3-Dec-1998 GvR 1008 Python 1.5.2b1 18-Jan-1997 GvR 1007 string interning and other speedups 11-Oct-1996 GvR renamed Py_Ellipses to Py_Ellipsis :-( 30-Jul-1996 GvR Slice and ellipses syntax added 23-Jul-1996 GvR For 1.4 -- better safe than sorry this time :-) 7-Nov-1995 GvR Keyword arguments (should've been done at 1.3 :-( ) 10-Jan-1995 GvR Renamed globals to new naming scheme 9-Jan-1995 GvR Initial version (incompatible with older API) */ /* The PYTHON_ABI_VERSION is introduced in PEP 384. For the lifetime of Python 3, it will stay at the value of 3; changes to the limited API must be performed in a strictly backwards-compatible manner. */ #define PYTHON_ABI_VERSION 3 #define PYTHON_ABI_STRING "3" #ifdef Py_TRACE_REFS /* When we are tracing reference counts, rename module creation functions so modules compiled with incompatible settings will generate a link-time error. */ #define PyModule_Create2 PyModule_Create2TraceRefs #define PyModule_FromDefAndSpec2 PyModule_FromDefAndSpec2TraceRefs #endif PyAPI_FUNC(PyObject *) PyModule_Create2(struct PyModuleDef*, int apiver); #ifndef Py_LIMITED_API PyAPI_FUNC(PyObject *) _PyModule_CreateInitialized(struct PyModuleDef*, int apiver); #endif #ifdef Py_LIMITED_API #define PyModule_Create(module) \ PyModule_Create2(module, PYTHON_ABI_VERSION) #else #define PyModule_Create(module) \ PyModule_Create2(module, PYTHON_API_VERSION) #endif #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000 /* New in 3.5 */ PyAPI_FUNC(PyObject *) PyModule_FromDefAndSpec2(PyModuleDef *def, PyObject *spec, int module_api_version); #ifdef Py_LIMITED_API #define PyModule_FromDefAndSpec(module, spec) \ PyModule_FromDefAndSpec2(module, spec, PYTHON_ABI_VERSION) #else #define PyModule_FromDefAndSpec(module, spec) \ PyModule_FromDefAndSpec2(module, spec, PYTHON_API_VERSION) #endif /* Py_LIMITED_API */ #endif /* New in 3.5 */ #ifndef Py_LIMITED_API PyAPI_DATA(const char *) _Py_PackageContext; #endif #ifdef __cplusplus } #endif #endif /* !Py_MODSUPPORT_H */ /a> 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 
/*
 /  Author: Sam Rushing <rushing@nightmare.com>
 /  Hacked for Unix by A.M. Kuchling <amk1@bigfoot.com> 
 /  $Id$

 / mmapmodule.cpp -- map a view of a file into memory
 /
 / todo: need permission flags, perhaps a 'chsize' analog
 /   not all functions check range yet!!!
 /
 /
 / Note: This module currently only deals with 32-bit file
 /   sizes.
 /
 / This version of mmapmodule.c has been changed significantly
 / from the original mmapfile.c on which it was based.
 / The original version of mmapfile is maintained by Sam at
 / ftp://squirl.nightmare.com/pub/python/python-ext.
*/

#include <Python.h>

#ifndef MS_WIN32
#define UNIX
#endif

#ifdef MS_WIN32
#include <windows.h>
static int
my_getpagesize(void)
{
    SYSTEM_INFO si;
    GetSystemInfo(&si);
    return si.dwPageSize;
}
#endif

#ifdef UNIX
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>

#ifndef MS_SYNC
/* This is missing e.g. on SunOS 4.1.4 */
#define MS_SYNC 0
#endif

#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
static int
my_getpagesize(void)
{
    return sysconf(_SC_PAGESIZE);
}
#else
#define my_getpagesize getpagesize
#endif

#endif /* UNIX */

#include <string.h>
#include <sys/types.h>

static PyObject *mmap_module_error;

typedef struct {
	PyObject_HEAD
	char *	data;
	size_t	size;
	size_t	pos;

#ifdef MS_WIN32
	HANDLE	map_handle;
	HANDLE	file_handle;
	char *	tagname;
#endif

#ifdef UNIX
        int fd;
#endif
} mmap_object;

static void
mmap_object_dealloc(mmap_object *m_obj)
{
#ifdef MS_WIN32
	if (m_obj->data != NULL)
		UnmapViewOfFile (m_obj->data);
	if (m_obj->map_handle != INVALID_HANDLE_VALUE)
		CloseHandle (m_obj->map_handle);
	if (m_obj->file_handle != INVALID_HANDLE_VALUE)
		CloseHandle (m_obj->file_handle);
	if (m_obj->tagname)
		PyMem_Free(m_obj->tagname);
#endif /* MS_WIN32 */

#ifdef UNIX
	if (m_obj->data!=NULL) {
		msync(m_obj->data, m_obj->size, MS_SYNC);
		munmap(m_obj->data, m_obj->size);
	}
#endif /* UNIX */

	PyObject_Del(m_obj);
}

static PyObject *
mmap_close_method(mmap_object *self, PyObject *args)
{
        if (!PyArg_ParseTuple(args, ":close"))
		return NULL;
#ifdef MS_WIN32
	/* For each resource we maintain, we need to check
	   the value is valid, and if so, free the resource 
	   and set the member value to an invalid value so
	   the dealloc does not attempt to resource clearing
	   again.
	   TODO - should we check for errors in the close operations???
	*/
	if (self->data != NULL) {
		UnmapViewOfFile (self->data);
		self->data = NULL;
	}
	if (self->map_handle != INVALID_HANDLE_VALUE) {
		CloseHandle (self->map_handle);
		self->map_handle = INVALID_HANDLE_VALUE;
	}
	if (self->file_handle != INVALID_HANDLE_VALUE) {
		CloseHandle (self->file_handle);
		self->file_handle = INVALID_HANDLE_VALUE;
	}
#endif /* MS_WIN32 */

#ifdef UNIX
	munmap(self->data, self->size);
	self->data = NULL;
#endif

	Py_INCREF (Py_None);
	return (Py_None);
}

#ifdef MS_WIN32
#define CHECK_VALID(err)						\
do {									\
    if (!self->map_handle) {						\
	PyErr_SetString (PyExc_ValueError, "mmap closed or invalid");	\
	return err;							\
    }									\
} while (0)
#endif /* MS_WIN32 */

#ifdef UNIX
#define CHECK_VALID(err)						\
do {									\
    if (self->data == NULL) {						\
	PyErr_SetString (PyExc_ValueError, "mmap closed or invalid");	\
	return err;							\
	}								\
} while (0)
#endif /* UNIX */

static PyObject *
mmap_read_byte_method(mmap_object *self,
		      PyObject *args)
{
	char value;
	char *where;
	CHECK_VALID(NULL);
        if (!PyArg_ParseTuple(args, ":read_byte"))
		return NULL;
	if (self->pos < self->size) {
	        where = self->data + self->pos;
		value = (char) *(where);
		self->pos += 1;
		return Py_BuildValue("c", (char) *(where));
	} else {
		PyErr_SetString (PyExc_ValueError, "read byte out of range");
		return NULL;
	}
}

static PyObject *
mmap_read_line_method(mmap_object *self,
		     PyObject *args)
{
	char *start = self->data+self->pos;
	char *eof = self->data+self->size;
	char *eol;
	PyObject *result;

	CHECK_VALID(NULL);
        if (!PyArg_ParseTuple(args, ":readline"))
		return NULL;

	eol = memchr(start, '\n', self->size - self->pos);
	if (!eol)
		eol = eof;
	else
		++eol;		/* we're interested in the position after the
				   newline. */
	result = PyString_FromStringAndSize(start, (eol - start));
	self->pos += (eol - start);
	return (result);
}

static PyObject *
mmap_read_method(mmap_object *self,
		 PyObject *args)
{
	long num_bytes;
	PyObject *result;

	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple(args, "l:read", &num_bytes))
		return(NULL);

	/* silently 'adjust' out-of-range requests */
	if ((self->pos + num_bytes) > self->size) {
		num_bytes -= (self->pos+num_bytes) - self->size;
	}
	result = Py_BuildValue("s#", self->data+self->pos, num_bytes);
	self->pos += num_bytes;	 
	return (result);
}

static PyObject *
mmap_find_method(mmap_object *self,
		 PyObject *args)
{
	int start = self->pos;
	char *needle;
	int len;

	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "s#|i:find", &needle, &len, &start)) {
		return NULL;
	} else {
		char *p = self->data+self->pos;
		char *e = self->data+self->size;
		while (p < e) {
			char *s = p;
			char *n = needle;
			while ((s<e) && (*n) && !(*s-*n)) {
				s++, n++;
			}
			if (!*n) {
				return Py_BuildValue (
					"i",
					(int) (p - (self->data + start)));
			}
			p++;
		}
		return Py_BuildValue ("l", (long) -1);
	}
}

static PyObject *
mmap_write_method(mmap_object *self,
		  PyObject *args)
{
	long length;
	char *data;

	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "s#:write", &data, &length))
		return(NULL);

	if ((self->pos + length) > self->size) {
		PyErr_SetString (PyExc_ValueError, "data out of range");
		return NULL;
	}
	memcpy (self->data+self->pos, data, length);
	self->pos = self->pos+length;
	Py_INCREF (Py_None);
	return (Py_None);
}

static PyObject *
mmap_write_byte_method(mmap_object *self,
		       PyObject *args)
{
	char value;

	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "c:write_byte", &value))
		return(NULL);

	*(self->data+self->pos) = value;
	self->pos += 1;
	Py_INCREF (Py_None);
	return (Py_None);
}

static PyObject *
mmap_size_method(mmap_object *self,
		 PyObject *args)
{
	CHECK_VALID(NULL);
        if (!PyArg_ParseTuple(args, ":size"))
		return NULL;

#ifdef MS_WIN32
	if (self->file_handle != INVALID_HANDLE_VALUE) {
		return (Py_BuildValue (
			"l", (long)
			GetFileSize (self->file_handle, NULL)));
	} else {
		return (Py_BuildValue ("l", (long) self->size) );
	}
#endif /* MS_WIN32 */

#ifdef UNIX
	{
		struct stat buf;
		if (-1 == fstat(self->fd, &buf)) {
			PyErr_SetFromErrno(mmap_module_error);
			return NULL;
		}
		return (Py_BuildValue ("l", (long) buf.st_size) );
	}
#endif /* UNIX */
}

/* This assumes that you want the entire file mapped,
 / and when recreating the map will make the new file
 / have the new size
 /
 / Is this really necessary?  This could easily be done
 / from python by just closing and re-opening with the
 / new size?
 */

static PyObject *
mmap_resize_method(mmap_object *self,
		   PyObject *args)
{
	unsigned long new_size;
	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "l:resize", &new_size)) {
		return NULL;
#ifdef MS_WIN32
	} else { 
		DWORD dwErrCode = 0;
		/* First, unmap the file view */
		UnmapViewOfFile (self->data);
		/* Close the mapping object */
		CloseHandle (self->map_handle);
		/* Move to the desired EOF position */
		SetFilePointer (self->file_handle,
				new_size, NULL, FILE_BEGIN);
		/* Change the size of the file */
		SetEndOfFile (self->file_handle);
		/* Create another mapping object and remap the file view */
		self->map_handle = CreateFileMapping (
			self->file_handle,
			NULL,
			PAGE_READWRITE,
			0,
			new_size,
			self->tagname);
		if (self->map_handle != NULL) {
			self->data = (char *) MapViewOfFile (self->map_handle,
							     FILE_MAP_WRITE,
							     0,
							     0,
							     0);
			if (self->data != NULL) {
				self->size = new_size;
				Py_INCREF (Py_None);
				return Py_None;
			} else {
				dwErrCode = GetLastError();
			}
		} else {
			dwErrCode = GetLastError();
		}
		PyErr_SetFromWindowsErr(dwErrCode);
		return (NULL);
#endif /* MS_WIN32 */

#ifdef UNIX
#ifndef HAVE_MREMAP 
} else {
	PyErr_SetString(PyExc_SystemError,
			"mmap: resizing not available--no mremap()");
	return NULL;
#else
} else {
	void *newmap;

#ifdef MREMAP_MAYMOVE
	newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE);
#else
	newmap = mremap(self->data, self->size, new_size, 0);
#endif
	if (newmap == (void *)-1) 
	{
		PyErr_SetFromErrno(mmap_module_error);
		return NULL;
	}
	self->data = newmap;
	self->size = new_size;
	Py_INCREF(Py_None);
	return Py_None;
#endif /* HAVE_MREMAP */
#endif /* UNIX */
}
}

static PyObject *
mmap_tell_method(mmap_object *self, PyObject *args)
{
	CHECK_VALID(NULL);
        if (!PyArg_ParseTuple(args, ":tell"))
		return NULL;
	return (Py_BuildValue ("l", (long) self->pos) );
}

static PyObject *
mmap_flush_method(mmap_object *self, PyObject *args)
{
	size_t offset	= 0;
	size_t size = self->size;
	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "|ll:flush", &offset, &size)) {
		return NULL;
	} else if ((offset + size) > self->size) {
		PyErr_SetString (PyExc_ValueError,
				 "flush values out of range");
		return NULL;
	} else {
#ifdef MS_WIN32
		return (Py_BuildValue("l", (long)
                                      FlushViewOfFile(self->data+offset, size)));
#endif /* MS_WIN32 */
#ifdef UNIX
		/* XXX semantics of return value? */
		/* XXX flags for msync? */
		if (-1 == msync(self->data + offset, size,
				MS_SYNC))
		{
			PyErr_SetFromErrno(mmap_module_error);
			return NULL;
		}
		return Py_BuildValue ("l", (long) 0);	
#endif /* UNIX */   
	}
}

static PyObject *
mmap_seek_method(mmap_object *self, PyObject *args)
{
	int dist;
	int how=0;
	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "i|i:seek", &dist, &how)) {
		return(NULL);
	} else {
		size_t where;
		switch (how) {
		case 0: /* relative to start */
			if (dist < 0)
				goto onoutofrange;
			where = dist;
			break;
		case 1: /* relative to current position */
			if ((int)self->pos + dist < 0)
				goto onoutofrange;
			where = self->pos + dist;
			break;
		case 2: /* relative to end */
			if ((int)self->size + dist < 0)
				goto onoutofrange;
			where = self->size + dist;
			break;
		default:
			PyErr_SetString (PyExc_ValueError,
					 "unknown seek type");
			return NULL;
		}
		if (where > self->size)
			goto onoutofrange;
		self->pos = where;
		Py_INCREF (Py_None);
		return (Py_None);
	}

onoutofrange:
	PyErr_SetString (PyExc_ValueError, "seek out of range");
	return NULL;
}

static PyObject *
mmap_move_method(mmap_object *self, PyObject *args)
{
	unsigned long dest, src, count;
	CHECK_VALID(NULL);
	if (!PyArg_ParseTuple (args, "iii:move", &dest, &src, &count)) {
		return NULL;
	} else {
		/* bounds check the values */
		if (/* end of source after end of data?? */
			((src+count) > self->size)
			/* dest will fit? */
			|| (dest+count > self->size)) {
			PyErr_SetString (PyExc_ValueError,
					 "source or destination out of range");
			return NULL;
		} else {
			memmove (self->data+dest, self->data+src, count);
			Py_INCREF (Py_None);
			return Py_None;
		}
	}
}

static struct PyMethodDef mmap_object_methods[] = {
	{"close",	(PyCFunction) mmap_close_method,	1},
	{"find",	(PyCFunction) mmap_find_method,		1},
	{"flush",	(PyCFunction) mmap_flush_method,	1},
	{"move",	(PyCFunction) mmap_move_method,		1},
	{"read",	(PyCFunction) mmap_read_method,		1},
	{"read_byte",	(PyCFunction) mmap_read_byte_method,  	1},
	{"readline",	(PyCFunction) mmap_read_line_method,	1},
	{"resize",	(PyCFunction) mmap_resize_method,	1},
	{"seek",	(PyCFunction) mmap_seek_method,		1},
	{"size",	(PyCFunction) mmap_size_method,		1},
	{"tell",	(PyCFunction) mmap_tell_method,		1},
	{"write",	(PyCFunction) mmap_write_method,	1},
	{"write_byte",	(PyCFunction) mmap_write_byte_method,	1},
	{NULL,	   NULL}       /* sentinel */
};

/* Functions for treating an mmap'ed file as a buffer */

static int
mmap_buffer_getreadbuf(mmap_object *self, int index, const void **ptr)
{
	CHECK_VALID(-1);
	if ( index != 0 ) {
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent mmap segment");
		return -1;
	}
	*ptr = self->data;
	return self->size;
}

static int
mmap_buffer_getwritebuf(mmap_object *self, int index, const void **ptr)
{  
	CHECK_VALID(-1);
	if ( index != 0 ) {
		PyErr_SetString(PyExc_SystemError,
				"Accessing non-existent mmap segment");
		return -1;
	}
	*ptr = self->data;
	return self->size;
}

static int
mmap_buffer_getsegcount(mmap_object *self, int *lenp)
{
	CHECK_VALID(-1);
	if (lenp) 
		*lenp = self->size;
	return 1;
}

static int
mmap_buffer_getcharbuffer(mmap_object *self, int index, const void **ptr)
{
	if ( index != 0 ) {
		PyErr_SetString(PyExc_SystemError,
				"accessing non-existent buffer segment");
		return -1;
	}
	*ptr = (const char *)self->data;
	return self->size;
}

static PyObject *
mmap_object_getattr(mmap_object *self, char *name)
{
	return Py_FindMethod (mmap_object_methods, (PyObject *)self, name);
}

static int
mmap_length(mmap_object *self)
{
	CHECK_VALID(-1);
	return self->size;
}

static PyObject *
mmap_item(mmap_object *self, int i)
{
	CHECK_VALID(NULL);
	if (i < 0 || (size_t)i >= self->size) {
		PyErr_SetString(PyExc_IndexError, "mmap index out of range");
		return NULL;
	}
	return PyString_FromStringAndSize(self->data + i, 1);
}

static PyObject *
mmap_slice(mmap_object *self, int ilow, int ihigh)
{
	CHECK_VALID(NULL);
	if (ilow < 0)
		ilow = 0;
	else if ((size_t)ilow > self->size)
		ilow = self->size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if ((size_t)ihigh > self->size)
		ihigh = self->size;
    
	return PyString_FromStringAndSize(self->data + ilow, ihigh-ilow);
}

static PyObject *
mmap_concat(mmap_object *self, PyObject *bb)
{
	CHECK_VALID(NULL);
	PyErr_SetString(PyExc_SystemError,
			"mmaps don't support concatenation");
	return NULL;
}

static PyObject *
mmap_repeat(mmap_object *self, int n)
{
	CHECK_VALID(NULL);
	PyErr_SetString(PyExc_SystemError,
			"mmaps don't support repeat operation");
	return NULL;
}

static int
mmap_ass_slice(mmap_object *self, int ilow, int ihigh, PyObject *v)
{
	const char *buf;

	CHECK_VALID(-1);
	if (ilow < 0)
		ilow = 0;
	else if ((size_t)ilow > self->size)
		ilow = self->size;
	if (ihigh < 0)
		ihigh = 0;
	if (ihigh < ilow)
		ihigh = ilow;
	else if ((size_t)ihigh > self->size)
		ihigh = self->size;
    
	if (! (PyString_Check(v)) ) {
		PyErr_SetString(PyExc_IndexError, 
				"mmap slice assignment must be a string");
		return -1;
	}
	if ( PyString_Size(v) != (ihigh - ilow) ) {
		PyErr_SetString(PyExc_IndexError, 
				"mmap slice assignment is wrong size");
		return -1;
	}
	buf = PyString_AsString(v);
	memcpy(self->data + ilow, buf, ihigh-ilow);
	return 0;
}

static int
mmap_ass_item(mmap_object *self, int i, PyObject *v)
{
	const char *buf;
 
	CHECK_VALID(-1);
	if (i < 0 || (size_t)i >= self->size) {
		PyErr_SetString(PyExc_IndexError, "mmap index out of range");
		return -1;
	}
	if (! (PyString_Check(v) && PyString_Size(v)==1) ) {
		PyErr_SetString(PyExc_IndexError, 
			"mmap assignment must be single-character string");
		return -1;
	}
	buf = PyString_AsString(v);
	self->data[i] = buf[0];
	return 0;
}

static PySequenceMethods mmap_as_sequence = {
	(inquiry)mmap_length,		       /*sq_length*/
	(binaryfunc)mmap_concat,	       /*sq_concat*/
	(intargfunc)mmap_repeat,	       /*sq_repeat*/
	(intargfunc)mmap_item,		       /*sq_item*/
	(intintargfunc)mmap_slice,	       /*sq_slice*/
	(intobjargproc)mmap_ass_item,	       /*sq_ass_item*/
	(intintobjargproc)mmap_ass_slice,      /*sq_ass_slice*/
};

static PyBufferProcs mmap_as_buffer = {
	(getreadbufferproc)mmap_buffer_getreadbuf,
	(getwritebufferproc)mmap_buffer_getwritebuf,
	(getsegcountproc)mmap_buffer_getsegcount,
	(getcharbufferproc)mmap_buffer_getcharbuffer,
};

static PyTypeObject mmap_object_type = {
	PyObject_HEAD_INIT(0) /* patched in module init */
	0,					/* ob_size */
	"mmap",					/* tp_name */
	sizeof(mmap_object),			/* tp_size */
	0,					/* tp_itemsize */
	/* methods */
	(destructor) mmap_object_dealloc,	/* tp_dealloc */
	0,					/* tp_print */
	(getattrfunc) mmap_object_getattr,	/* tp_getattr */
	0,					/* tp_setattr */
	0,					/* tp_compare */
	0,					/* tp_repr */
	0,					/* tp_as_number */
	&mmap_as_sequence,			/*tp_as_sequence*/
	0,					/*tp_as_mapping*/
	0,					/*tp_hash*/
	0,					/*tp_call*/
	0,					/*tp_str*/
	0,					/*tp_getattro*/
	0,					/*tp_setattro*/
	&mmap_as_buffer,			/*tp_as_buffer*/
	Py_TPFLAGS_HAVE_GETCHARBUFFER,		/*tp_flags*/
	0,					/*tp_doc*/
};


/* extract the map size from the given PyObject

   The map size is restricted to [0, INT_MAX] because this is the current
   Python limitation on object sizes. Although the mmap object *could* handle
   a larger map size, there is no point because all the useful operations
   (len(), slicing(), sequence indexing) are limited by a C int.

   Returns -1 on error, with an appropriate Python exception raised. On
   success, the map size is returned. */
static int
_GetMapSize(PyObject *o)
{
	if (PyInt_Check(o)) {
		long i = PyInt_AsLong(o);
		if (PyErr_Occurred())
			return -1;
		if (i < 0)
			goto onnegoverflow;
		if (i > INT_MAX)
			goto onposoverflow;
		return (int)i;
	}
	else if (PyLong_Check(o)) {
		long i = PyLong_AsLong(o);
		if (PyErr_Occurred()) {
			/* yes negative overflow is mistaken for positive overflow
			   but not worth the trouble to check sign of 'i' */
			if (PyErr_ExceptionMatches(PyExc_OverflowError))
				goto onposoverflow;
			else
				return -1;
		}
		if (i < 0)
			goto onnegoverflow;
		if (i > INT_MAX)
			goto onposoverflow;
		return (int)i;
	}
	else {
		PyErr_SetString(PyExc_TypeError,
			"map size must be an integral value");
		return -1;
	}

onnegoverflow:
	PyErr_SetString(PyExc_OverflowError,
		"memory mapped size must be positive");
	return -1;

onposoverflow:
	PyErr_SetString(PyExc_OverflowError,
		"memory mapped size is too large (limited by C int)");
	return -1;
}

#ifdef UNIX 
static PyObject *
new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
{
	mmap_object *m_obj;
	PyObject *map_size_obj = NULL;
	int map_size;
	int fd, flags = MAP_SHARED, prot = PROT_WRITE | PROT_READ;
	char *keywords[] = {"file", "size", "flags", "prot", NULL};

	if (!PyArg_ParseTupleAndKeywords(args, kwdict, 
					 "iO|ii", keywords, 
					 &fd, &map_size_obj, &flags, &prot)
		)
		return NULL;
	map_size = _GetMapSize(map_size_obj);
	if (map_size < 0)
		return NULL;
	
	m_obj = PyObject_New (mmap_object, &mmap_object_type);
	if (m_obj == NULL) {return NULL;}
	m_obj->size = (size_t) map_size;
	m_obj->pos = (size_t) 0;
	m_obj->fd = fd;
	m_obj->data = mmap(NULL, map_size, 
			   prot, flags,
			   fd, 0);
	if (m_obj->data == (void *)-1)
	{
		Py_DECREF(m_obj);
		PyErr_SetFromErrno(mmap_module_error);
		return NULL;
	}
	return (PyObject *)m_obj;
}
#endif /* UNIX */

#ifdef MS_WIN32
static PyObject *
new_mmap_object(PyObject *self, PyObject *args)
{
	mmap_object *m_obj;
	PyObject *map_size_obj = NULL;
	int map_size;
	char *tagname = "";

	DWORD dwErr = 0;
	int fileno;
	HANDLE fh = 0;

	if (!PyArg_ParseTuple(args,
			  "iO|z",
			  &fileno,
			  &map_size_obj,
			  &tagname)
		)
		return NULL;
  
	map_size = _GetMapSize(map_size_obj);
	if (map_size < 0)
		return NULL;
	
	/* if an actual filename has been specified */
	if (fileno != 0) {
		fh = (HANDLE)_get_osfhandle(fileno);
		if (fh==(HANDLE)-1) {
		    PyErr_SetFromErrno(mmap_module_error);
		    return NULL;
		}
		/* Win9x appears to need us seeked to zero */
		fseek(&_iob[fileno], 0, SEEK_SET);
	}

	m_obj = PyObject_New (mmap_object, &mmap_object_type);
	if (m_obj==NULL)
		return NULL;
	/* Set every field to an invalid marker, so we can safely
	   destruct the object in the face of failure */
	m_obj->data = NULL;
	m_obj->file_handle = INVALID_HANDLE_VALUE;
	m_obj->map_handle = INVALID_HANDLE_VALUE;
	m_obj->tagname = NULL;

	if (fh) {
		/* It is necessary to duplicate the handle, so the
		   Python code can close it on us */
		if (!DuplicateHandle(
			    GetCurrentProcess(), /* source process handle */
			    fh, /* handle to be duplicated */
			    GetCurrentProcess(), /* target proc handle */
			    (LPHANDLE)&m_obj->file_handle, /* result */
			    0, /* access - ignored due to options value */
			    FALSE, /* inherited by child processes? */
			    DUPLICATE_SAME_ACCESS)) { /* options */
			dwErr = GetLastError();
			Py_DECREF(m_obj);
			PyErr_SetFromWindowsErr(dwErr);
			return NULL;
		}
		if (!map_size) {
			m_obj->size = GetFileSize (fh, NULL);
		} else {
			m_obj->size = map_size;
		}
	}
	else {
		m_obj->size = map_size;
	}

	/* set the initial position */
	m_obj->pos = (size_t) 0;

	/* set the tag name */
	if (tagname != NULL && *tagname != '\0') {
		m_obj->tagname = PyMem_Malloc(strlen(tagname)+1);
		if (m_obj->tagname == NULL) {
			PyErr_NoMemory();
			Py_DECREF(m_obj);
			return NULL;
		}
		strcpy(m_obj->tagname, tagname);
	}
	else
		m_obj->tagname = NULL;

	m_obj->map_handle = CreateFileMapping (m_obj->file_handle,
					       NULL,
					       PAGE_READWRITE,
					       0,
					       m_obj->size,
					       m_obj->tagname);
	if (m_obj->map_handle != NULL) {
		m_obj->data = (char *) MapViewOfFile (m_obj->map_handle,
						      FILE_MAP_WRITE,
						      0,
						      0,
						      0);
		if (m_obj->data != NULL) {
			return ((PyObject *) m_obj);
		} else {
		    dwErr = GetLastError();
		}
	} else {
		dwErr = GetLastError();
	}
	Py_DECREF(m_obj);
	PyErr_SetFromWindowsErr(dwErr);
	return (NULL);
}
#endif /* MS_WIN32 */

/* List of functions exported by this module */
static struct PyMethodDef mmap_functions[] = {
	{"mmap",	(PyCFunction) new_mmap_object, 
	 METH_VARARGS|METH_KEYWORDS},
	{NULL,		NULL}	     /* Sentinel */
};

DL_EXPORT(void)
initmmap(void)
{
	PyObject *dict, *module;

	/* Patch the object type */
	mmap_object_type.ob_type = &PyType_Type;

	module = Py_InitModule ("mmap", mmap_functions);
	dict = PyModule_GetDict (module);
	mmap_module_error = PyExc_EnvironmentError;
	Py_INCREF(mmap_module_error);
	PyDict_SetItemString (dict, "error", mmap_module_error);
#ifdef PROT_EXEC
	PyDict_SetItemString (dict, "PROT_EXEC", PyInt_FromLong(PROT_EXEC) );
#endif
#ifdef PROT_READ
	PyDict_SetItemString (dict, "PROT_READ", PyInt_FromLong(PROT_READ) );
#endif
#ifdef PROT_WRITE
	PyDict_SetItemString (dict, "PROT_WRITE", PyInt_FromLong(PROT_WRITE) );
#endif

#ifdef MAP_SHARED
	PyDict_SetItemString (dict, "MAP_SHARED", PyInt_FromLong(MAP_SHARED) );
#endif
#ifdef MAP_PRIVATE
	PyDict_SetItemString (dict, "MAP_PRIVATE",
			      PyInt_FromLong(MAP_PRIVATE) );
#endif
#ifdef MAP_DENYWRITE
	PyDict_SetItemString (dict, "MAP_DENYWRITE",
			      PyInt_FromLong(MAP_DENYWRITE) );
#endif
#ifdef MAP_EXECUTABLE
	PyDict_SetItemString (dict, "MAP_EXECUTABLE",
			      PyInt_FromLong(MAP_EXECUTABLE) );
#endif
#ifdef MAP_ANON
	PyDict_SetItemString (dict, "MAP_ANON", PyInt_FromLong(MAP_ANON) );
	PyDict_SetItemString (dict, "MAP_ANONYMOUS",
			      PyInt_FromLong(MAP_ANON) );
#endif

	PyDict_SetItemString (dict, "PAGESIZE",
			      PyInt_FromLong( (long)my_getpagesize() ) );
}
generated by cgit v0.12 at 2025-12-30 21:20:19 (GMT)