sourcemod-central: extensions/sqlite/sqlite-source/os

ds@1952	1	/*
ds@1952	2	** 2004 May 22
ds@1952	3	**
ds@1952	4	** The author disclaims copyright to this source code. In place of
ds@1952	5	** a legal notice, here is a blessing:
ds@1952	6	**
ds@1952	7	** May you do good and not evil.
ds@1952	8	** May you find forgiveness for yourself and forgive others.
ds@1952	9	** May you share freely, never taking more than you give.
ds@1952	10	**
ds@1952	11	******************************************************************************
ds@1952	12	**
ds@1952	13	** This file contains code that is specific to windows.
ds@1952	14	*/
ds@1952	15	#include "sqliteInt.h"
ds@1952	16	#if OS_WIN /* This file is used for windows only */
ds@1952	17
ds@1952	18
ds@1952	19	/*
ds@1952	20	** A Note About Memory Allocation:
ds@1952	21	**
ds@1952	22	** This driver uses malloc()/free() directly rather than going through
ds@1952	23	** the SQLite-wrappers sqlite3_malloc()/sqlite3_free(). Those wrappers
ds@1952	24	** are designed for use on embedded systems where memory is scarce and
ds@1952	25	** malloc failures happen frequently. Win32 does not typically run on
ds@1952	26	** embedded systems, and when it does the developers normally have bigger
ds@1952	27	** problems to worry about than running out of memory. So there is not
ds@1952	28	** a compelling need to use the wrappers.
ds@1952	29	**
ds@1952	30	** But there is a good reason to not use the wrappers. If we use the
ds@1952	31	** wrappers then we will get simulated malloc() failures within this
ds@1952	32	** driver. And that causes all kinds of problems for our tests. We
ds@1952	33	** could enhance SQLite to deal with simulated malloc failures within
ds@1952	34	** the OS driver, but the code to deal with those failure would not
ds@1952	35	** be exercised on Linux (which does not need to malloc() in the driver)
ds@1952	36	** and so we would have difficulty writing coverage tests for that
ds@1952	37	** code. Better to leave the code out, we think.
ds@1952	38	**
ds@1952	39	** The point of this discussion is as follows: When creating a new
ds@1952	40	** OS layer for an embedded system, if you use this file as an example,
ds@1952	41	** avoid the use of malloc()/free(). Those routines work ok on windows
ds@1952	42	** desktops but not so well in embedded systems.
ds@1952	43	*/
ds@1952	44
ds@1952	45	#include <winbase.h>
ds@1952	46
ds@1952	47	#ifdef __CYGWIN__
ds@1952	48	# include <sys/cygwin.h>
ds@1952	49	#endif
ds@1952	50
ds@1952	51	/*
ds@1952	52	** Macros used to determine whether or not to use threads.
ds@1952	53	*/
ds@1952	54	#if defined(THREADSAFE) && THREADSAFE
ds@1952	55	# define SQLITE_W32_THREADS 1
ds@1952	56	#endif
ds@1952	57
ds@1952	58	/*
ds@1952	59	** Include code that is common to all os_*.c files
ds@1952	60	*/
ds@1952	61	#include "os_common.h"
ds@1952	62
ds@1952	63	/*
ds@1952	64	** Determine if we are dealing with WindowsCE - which has a much
ds@1952	65	** reduced API.
ds@1952	66	*/
ds@1952	67	#if defined(_WIN32_WCE)
ds@1952	68	# define OS_WINCE 1
ds@1952	69	# define AreFileApisANSI() 1
ds@1952	70	#else
ds@1952	71	# define OS_WINCE 0
ds@1952	72	#endif
ds@1952	73
ds@1952	74	/*
ds@1952	75	** WinCE lacks native support for file locking so we have to fake it
ds@1952	76	** with some code of our own.
ds@1952	77	*/
ds@1952	78	#if OS_WINCE
ds@1952	79	typedef struct winceLock {
ds@1952	80	int nReaders; /* Number of reader locks obtained */
ds@1952	81	BOOL bPending; /* Indicates a pending lock has been obtained */
ds@1952	82	BOOL bReserved; /* Indicates a reserved lock has been obtained */
ds@1952	83	BOOL bExclusive; /* Indicates an exclusive lock has been obtained */
ds@1952	84	} winceLock;
ds@1952	85	#endif
ds@1952	86
ds@1952	87	/*
ds@1952	88	** The winFile structure is a subclass of sqlite3_file* specific to the win32
ds@1952	89	** portability layer.
ds@1952	90	*/
ds@1952	91	typedef struct winFile winFile;
ds@1952	92	struct winFile {
ds@1952	93	const sqlite3_io_methods pMethod;/ Must be first */
ds@1952	94	HANDLE h; /* Handle for accessing the file */
ds@1952	95	unsigned char locktype; /* Type of lock currently held on this file */
ds@1952	96	short sharedLockByte; /* Randomly chosen byte used as a shared lock */
ds@1952	97	#if OS_WINCE
ds@1952	98	WCHAR zDeleteOnClose; / Name of file to delete when closing */
ds@1952	99	HANDLE hMutex; /* Mutex used to control access to shared lock */
ds@1952	100	HANDLE hShared; /* Shared memory segment used for locking */
ds@1952	101	winceLock local; /* Locks obtained by this instance of winFile */
ds@1952	102	winceLock shared; / Global shared lock memory for the file */
ds@1952	103	#endif
ds@1952	104	};
ds@1952	105
ds@1952	106
ds@1952	107	/*
ds@1952	108	** The following variable is (normally) set once and never changes
ds@1952	109	** thereafter. It records whether the operating system is Win95
ds@1952	110	** or WinNT.
ds@1952	111	**
ds@1952	112	** 0: Operating system unknown.
ds@1952	113	** 1: Operating system is Win95.
ds@1952	114	** 2: Operating system is WinNT.
ds@1952	115	**
ds@1952	116	** In order to facilitate testing on a WinNT system, the test fixture
ds@1952	117	** can manually set this value to 1 to emulate Win98 behavior.
ds@1952	118	*/
ds@1952	119	#ifdef SQLITE_TEST
ds@1952	120	int sqlite3_os_type = 0;
ds@1952	121	#else
ds@1952	122	static int sqlite3_os_type = 0;
ds@1952	123	#endif
ds@1952	124
ds@1952	125	/*
ds@1952	126	** Return true (non-zero) if we are running under WinNT, Win2K, WinXP,
ds@1952	127	** or WinCE. Return false (zero) for Win95, Win98, or WinME.
ds@1952	128	**
ds@1952	129	** Here is an interesting observation: Win95, Win98, and WinME lack
ds@1952	130	** the LockFileEx() API. But we can still statically link against that
ds@1952	131	** API as long as we don't call it win running Win95/98/ME. A call to
ds@1952	132	** this routine is used to determine if the host is Win95/98/ME or
ds@1952	133	** WinNT/2K/XP so that we will know whether or not we can safely call
ds@1952	134	** the LockFileEx() API.
ds@1952	135	*/
ds@1952	136	#if OS_WINCE
ds@1952	137	# define isNT() (1)
ds@1952	138	#else
ds@1952	139	static int isNT(void){
ds@1952	140	if( sqlite3_os_type==0 ){
ds@1952	141	OSVERSIONINFO sInfo;
ds@1952	142	sInfo.dwOSVersionInfoSize = sizeof(sInfo);
ds@1952	143	GetVersionEx(&sInfo);
ds@1952	144	sqlite3_os_type = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
ds@1952	145	}
ds@1952	146	return sqlite3_os_type==2;
ds@1952	147	}
ds@1952	148	#endif /* OS_WINCE */
ds@1952	149
ds@1952	150	/*
ds@1952	151	** Convert a UTF-8 string to microsoft unicode (UTF-16?).
ds@1952	152	**
ds@1952	153	** Space to hold the returned string is obtained from malloc.
ds@1952	154	*/
ds@1952	155	static WCHAR utf8ToUnicode(const char zFilename){
ds@1952	156	int nChar;
ds@1952	157	WCHAR *zWideFilename;
ds@1952	158
ds@1952	159	nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
ds@1952	160	zWideFilename = malloc( nChar*sizeof(zWideFilename[0]) );
ds@1952	161	if( zWideFilename==0 ){
ds@1952	162	return 0;
ds@1952	163	}
ds@1952	164	nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename, nChar);
ds@1952	165	if( nChar==0 ){
ds@1952	166	free(zWideFilename);
ds@1952	167	zWideFilename = 0;
ds@1952	168	}
ds@1952	169	return zWideFilename;
ds@1952	170	}
ds@1952	171
ds@1952	172	/*
ds@1952	173	** Convert microsoft unicode to UTF-8. Space to hold the returned string is
ds@1952	174	** obtained from malloc().
ds@1952	175	*/
ds@1952	176	static char unicodeToUtf8(const WCHAR zWideFilename){
ds@1952	177	int nByte;
ds@1952	178	char *zFilename;
ds@1952	179
ds@1952	180	nByte = WideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, 0, 0, 0, 0);
ds@1952	181	zFilename = malloc( nByte );
ds@1952	182	if( zFilename==0 ){
ds@1952	183	return 0;
ds@1952	184	}
ds@1952	185	nByte = WideCharToMultiByte(CP_UTF8, 0, zWideFilename, -1, zFilename, nByte,
ds@1952	186	0, 0);
ds@1952	187	if( nByte == 0 ){
ds@1952	188	free(zFilename);
ds@1952	189	zFilename = 0;
ds@1952	190	}
ds@1952	191	return zFilename;
ds@1952	192	}
ds@1952	193
ds@1952	194	/*
ds@1952	195	** Convert an ansi string to microsoft unicode, based on the
ds@1952	196	** current codepage settings for file apis.
ds@1952	197	**
ds@1952	198	** Space to hold the returned string is obtained
ds@1952	199	** from malloc.
ds@1952	200	*/
ds@1952	201	static WCHAR mbcsToUnicode(const char zFilename){
ds@1952	202	int nByte;
ds@1952	203	WCHAR *zMbcsFilename;
ds@1952	204	int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
ds@1952	205
ds@1952	206	nByte = MultiByteToWideChar(codepage, 0, zFilename, -1, NULL,0)*sizeof(WCHAR);
ds@1952	207	zMbcsFilename = malloc( nByte*sizeof(zMbcsFilename[0]) );
ds@1952	208	if( zMbcsFilename==0 ){
ds@1952	209	return 0;
ds@1952	210	}
ds@1952	211	nByte = MultiByteToWideChar(codepage, 0, zFilename, -1, zMbcsFilename, nByte);
ds@1952	212	if( nByte==0 ){
ds@1952	213	free(zMbcsFilename);
ds@1952	214	zMbcsFilename = 0;
ds@1952	215	}
ds@1952	216	return zMbcsFilename;
ds@1952	217	}
ds@1952	218
ds@1952	219	/*
ds@1952	220	** Convert microsoft unicode to multibyte character string, based on the
ds@1952	221	** user's Ansi codepage.
ds@1952	222	**
ds@1952	223	** Space to hold the returned string is obtained from
ds@1952	224	** malloc().
ds@1952	225	*/
ds@1952	226	static char unicodeToMbcs(const WCHAR zWideFilename){
ds@1952	227	int nByte;
ds@1952	228	char *zFilename;
ds@1952	229	int codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
ds@1952	230
ds@1952	231	nByte = WideCharToMultiByte(codepage, 0, zWideFilename, -1, 0, 0, 0, 0);
ds@1952	232	zFilename = malloc( nByte );
ds@1952	233	if( zFilename==0 ){
ds@1952	234	return 0;
ds@1952	235	}
ds@1952	236	nByte = WideCharToMultiByte(codepage, 0, zWideFilename, -1, zFilename, nByte,
ds@1952	237	0, 0);
ds@1952	238	if( nByte == 0 ){
ds@1952	239	free(zFilename);
ds@1952	240	zFilename = 0;
ds@1952	241	}
ds@1952	242	return zFilename;
ds@1952	243	}
ds@1952	244
ds@1952	245	/*
ds@1952	246	** Convert multibyte character string to UTF-8. Space to hold the
ds@1952	247	** returned string is obtained from malloc().
ds@1952	248	*/
ds@1952	249	static char mbcsToUtf8(const char zFilename){
ds@1952	250	char *zFilenameUtf8;
ds@1952	251	WCHAR *zTmpWide;
ds@1952	252
ds@1952	253	zTmpWide = mbcsToUnicode(zFilename);
ds@1952	254	if( zTmpWide==0 ){
ds@1952	255	return 0;
ds@1952	256	}
ds@1952	257	zFilenameUtf8 = unicodeToUtf8(zTmpWide);
ds@1952	258	free(zTmpWide);
ds@1952	259	return zFilenameUtf8;
ds@1952	260	}
ds@1952	261
ds@1952	262	/*
ds@1952	263	** Convert UTF-8 to multibyte character string. Space to hold the
ds@1952	264	** returned string is obtained from malloc().
ds@1952	265	*/
ds@1952	266	static char utf8ToMbcs(const char zFilename){
ds@1952	267	char *zFilenameMbcs;
ds@1952	268	WCHAR *zTmpWide;
ds@1952	269
ds@1952	270	zTmpWide = utf8ToUnicode(zFilename);
ds@1952	271	if( zTmpWide==0 ){
ds@1952	272	return 0;
ds@1952	273	}
ds@1952	274	zFilenameMbcs = unicodeToMbcs(zTmpWide);
ds@1952	275	free(zTmpWide);
ds@1952	276	return zFilenameMbcs;
ds@1952	277	}
ds@1952	278
ds@1952	279	#if OS_WINCE
ds@1952	280	/*************************************************************************
ds@1952	281	** This section contains code for WinCE only.
ds@1952	282	*/
ds@1952	283	/*
ds@1952	284	** WindowsCE does not have a localtime() function. So create a
ds@1952	285	** substitute.
ds@1952	286	*/
ds@1952	287	#include <time.h>
ds@1952	288	struct tm __cdecl localtime(const time_t t)
ds@1952	289	{
ds@1952	290	static struct tm y;
ds@1952	291	FILETIME uTm, lTm;
ds@1952	292	SYSTEMTIME pTm;
ds@1952	293	sqlite3_int64 t64;
ds@1952	294	t64 = *t;
ds@1952	295	t64 = (t64 + 11644473600)*10000000;
ds@1952	296	uTm.dwLowDateTime = t64 & 0xFFFFFFFF;
ds@1952	297	uTm.dwHighDateTime= t64 >> 32;
ds@1952	298	FileTimeToLocalFileTime(&uTm,&lTm);
ds@1952	299	FileTimeToSystemTime(&lTm,&pTm);
ds@1952	300	y.tm_year = pTm.wYear - 1900;
ds@1952	301	y.tm_mon = pTm.wMonth - 1;
ds@1952	302	y.tm_wday = pTm.wDayOfWeek;
ds@1952	303	y.tm_mday = pTm.wDay;
ds@1952	304	y.tm_hour = pTm.wHour;
ds@1952	305	y.tm_min = pTm.wMinute;
ds@1952	306	y.tm_sec = pTm.wSecond;
ds@1952	307	return &y;
ds@1952	308	}
ds@1952	309
ds@1952	310	/* This will never be called, but defined to make the code compile */
ds@1952	311	#define GetTempPathA(a,b)
ds@1952	312
ds@1952	313	#define LockFile(a,b,c,d,e) winceLockFile(&a, b, c, d, e)
ds@1952	314	#define UnlockFile(a,b,c,d,e) winceUnlockFile(&a, b, c, d, e)
ds@1952	315	#define LockFileEx(a,b,c,d,e,f) winceLockFileEx(&a, b, c, d, e, f)
ds@1952	316
ds@1952	317	#define HANDLE_TO_WINFILE(a) (winFile)&((char)a)[-offsetof(winFile,h)]
ds@1952	318
ds@1952	319	/*
ds@1952	320	** Acquire a lock on the handle h
ds@1952	321	*/
ds@1952	322	static void winceMutexAcquire(HANDLE h){
ds@1952	323	DWORD dwErr;
ds@1952	324	do {
ds@1952	325	dwErr = WaitForSingleObject(h, INFINITE);
ds@1952	326	} while (dwErr != WAIT_OBJECT_0 && dwErr != WAIT_ABANDONED);
ds@1952	327	}
ds@1952	328	/*
ds@1952	329	** Release a lock acquired by winceMutexAcquire()
ds@1952	330	*/
ds@1952	331	#define winceMutexRelease(h) ReleaseMutex(h)
ds@1952	332
ds@1952	333	/*
ds@1952	334	** Create the mutex and shared memory used for locking in the file
ds@1952	335	** descriptor pFile
ds@1952	336	*/
ds@1952	337	static BOOL winceCreateLock(const char zFilename, winFile pFile){
ds@1952	338	WCHAR *zTok;
ds@1952	339	WCHAR *zName = utf8ToUnicode(zFilename);
ds@1952	340	BOOL bInit = TRUE;
ds@1952	341
ds@1952	342	/* Initialize the local lockdata */
ds@1952	343	ZeroMemory(&pFile->local, sizeof(pFile->local));
ds@1952	344
ds@1952	345	/* Replace the backslashes from the filename and lowercase it
ds@1952	346	** to derive a mutex name. */
ds@1952	347	zTok = CharLowerW(zName);
ds@1952	348	for (;*zTok;zTok++){
ds@1952	349	if (zTok == '\\') zTok = '_';
ds@1952	350	}
ds@1952	351
ds@1952	352	/* Create/open the named mutex */
ds@1952	353	pFile->hMutex = CreateMutexW(NULL, FALSE, zName);
ds@1952	354	if (!pFile->hMutex){
ds@1952	355	free(zName);
ds@1952	356	return FALSE;
ds@1952	357	}
ds@1952	358
ds@1952	359	/* Acquire the mutex before continuing */
ds@1952	360	winceMutexAcquire(pFile->hMutex);
ds@1952	361
ds@1952	362	/* Since the names of named mutexes, semaphores, file mappings etc are
ds@1952	363	** case-sensitive, take advantage of that by uppercasing the mutex name
ds@1952	364	** and using that as the shared filemapping name.
ds@1952	365	*/
ds@1952	366	CharUpperW(zName);
ds@1952	367	pFile->hShared = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
ds@1952	368	PAGE_READWRITE, 0, sizeof(winceLock),
ds@1952	369	zName);
ds@1952	370
ds@1952	371	/* Set a flag that indicates we're the first to create the memory so it
ds@1952	372	** must be zero-initialized */
ds@1952	373	if (GetLastError() == ERROR_ALREADY_EXISTS){
ds@1952	374	bInit = FALSE;
ds@1952	375	}
ds@1952	376
ds@1952	377	free(zName);
ds@1952	378
ds@1952	379	/* If we succeeded in making the shared memory handle, map it. */
ds@1952	380	if (pFile->hShared){
ds@1952	381	pFile->shared = (winceLock*)MapViewOfFile(pFile->hShared,
ds@1952	382	FILE_MAP_READ\|FILE_MAP_WRITE, 0, 0, sizeof(winceLock));
ds@1952	383	/* If mapping failed, close the shared memory handle and erase it */
ds@1952	384	if (!pFile->shared){
ds@1952	385	CloseHandle(pFile->hShared);
ds@1952	386	pFile->hShared = NULL;
ds@1952	387	}
ds@1952	388	}
ds@1952	389
ds@1952	390	/* If shared memory could not be created, then close the mutex and fail */
ds@1952	391	if (pFile->hShared == NULL){
ds@1952	392	winceMutexRelease(pFile->hMutex);
ds@1952	393	CloseHandle(pFile->hMutex);
ds@1952	394	pFile->hMutex = NULL;
ds@1952	395	return FALSE;
ds@1952	396	}
ds@1952	397
ds@1952	398	/* Initialize the shared memory if we're supposed to */
ds@1952	399	if (bInit) {
ds@1952	400	ZeroMemory(pFile->shared, sizeof(winceLock));
ds@1952	401	}
ds@1952	402
ds@1952	403	winceMutexRelease(pFile->hMutex);
ds@1952	404	return TRUE;
ds@1952	405	}
ds@1952	406
ds@1952	407	/*
ds@1952	408	** Destroy the part of winFile that deals with wince locks
ds@1952	409	*/
ds@1952	410	static void winceDestroyLock(winFile *pFile){
ds@1952	411	if (pFile->hMutex){
ds@1952	412	/* Acquire the mutex */
ds@1952	413	winceMutexAcquire(pFile->hMutex);
ds@1952	414
ds@1952	415	/* The following blocks should probably assert in debug mode, but they
ds@1952	416	are to cleanup in case any locks remained open */
ds@1952	417	if (pFile->local.nReaders){
ds@1952	418	pFile->shared->nReaders --;
ds@1952	419	}
ds@1952	420	if (pFile->local.bReserved){
ds@1952	421	pFile->shared->bReserved = FALSE;
ds@1952	422	}
ds@1952	423	if (pFile->local.bPending){
ds@1952	424	pFile->shared->bPending = FALSE;
ds@1952	425	}
ds@1952	426	if (pFile->local.bExclusive){
ds@1952	427	pFile->shared->bExclusive = FALSE;
ds@1952	428	}
ds@1952	429
ds@1952	430	/* De-reference and close our copy of the shared memory handle */
ds@1952	431	UnmapViewOfFile(pFile->shared);
ds@1952	432	CloseHandle(pFile->hShared);
ds@1952	433
ds@1952	434	if( pFile->zDeleteOnClose ){
ds@1952	435	DeleteFileW(pFile->zDeleteOnClose);
ds@1952	436	free(pFile->zDeleteOnClose);
ds@1952	437	pFile->zDeleteOnClose = 0;
ds@1952	438	}
ds@1952	439
ds@1952	440	/* Done with the mutex */
ds@1952	441	winceMutexRelease(pFile->hMutex);
ds@1952	442	CloseHandle(pFile->hMutex);
ds@1952	443	pFile->hMutex = NULL;
ds@1952	444	}
ds@1952	445	}
ds@1952	446
ds@1952	447	/*
ds@1952	448	** An implementation of the LockFile() API of windows for wince
ds@1952	449	*/
ds@1952	450	static BOOL winceLockFile(
ds@1952	451	HANDLE *phFile,
ds@1952	452	DWORD dwFileOffsetLow,
ds@1952	453	DWORD dwFileOffsetHigh,
ds@1952	454	DWORD nNumberOfBytesToLockLow,
ds@1952	455	DWORD nNumberOfBytesToLockHigh
ds@1952	456	){
ds@1952	457	winFile *pFile = HANDLE_TO_WINFILE(phFile);
ds@1952	458	BOOL bReturn = FALSE;
ds@1952	459
ds@1952	460	if (!pFile->hMutex) return TRUE;
ds@1952	461	winceMutexAcquire(pFile->hMutex);
ds@1952	462
ds@1952	463	/* Wanting an exclusive lock? */
ds@1952	464	if (dwFileOffsetLow == SHARED_FIRST
ds@1952	465	&& nNumberOfBytesToLockLow == SHARED_SIZE){
ds@1952	466	if (pFile->shared->nReaders == 0 && pFile->shared->bExclusive == 0){
ds@1952	467	pFile->shared->bExclusive = TRUE;
ds@1952	468	pFile->local.bExclusive = TRUE;
ds@1952	469	bReturn = TRUE;
ds@1952	470	}
ds@1952	471	}
ds@1952	472
ds@1952	473	/* Want a read-only lock? */
ds@1952	474	else if ((dwFileOffsetLow >= SHARED_FIRST &&
ds@1952	475	dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE) &&
ds@1952	476	nNumberOfBytesToLockLow == 1){
ds@1952	477	if (pFile->shared->bExclusive == 0){
ds@1952	478	pFile->local.nReaders ++;
ds@1952	479	if (pFile->local.nReaders == 1){
ds@1952	480	pFile->shared->nReaders ++;
ds@1952	481	}
ds@1952	482	bReturn = TRUE;
ds@1952	483	}
ds@1952	484	}
ds@1952	485
ds@1952	486	/* Want a pending lock? */
ds@1952	487	else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToLockLow == 1){
ds@1952	488	/* If no pending lock has been acquired, then acquire it */
ds@1952	489	if (pFile->shared->bPending == 0) {
ds@1952	490	pFile->shared->bPending = TRUE;
ds@1952	491	pFile->local.bPending = TRUE;
ds@1952	492	bReturn = TRUE;
ds@1952	493	}
ds@1952	494	}
ds@1952	495	/* Want a reserved lock? */
ds@1952	496	else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToLockLow == 1){
ds@1952	497	if (pFile->shared->bReserved == 0) {
ds@1952	498	pFile->shared->bReserved = TRUE;
ds@1952	499	pFile->local.bReserved = TRUE;
ds@1952	500	bReturn = TRUE;
ds@1952	501	}
ds@1952	502	}
ds@1952	503
ds@1952	504	winceMutexRelease(pFile->hMutex);
ds@1952	505	return bReturn;
ds@1952	506	}
ds@1952	507
ds@1952	508	/*
ds@1952	509	** An implementation of the UnlockFile API of windows for wince
ds@1952	510	*/
ds@1952	511	static BOOL winceUnlockFile(
ds@1952	512	HANDLE *phFile,
ds@1952	513	DWORD dwFileOffsetLow,
ds@1952	514	DWORD dwFileOffsetHigh,
ds@1952	515	DWORD nNumberOfBytesToUnlockLow,
ds@1952	516	DWORD nNumberOfBytesToUnlockHigh
ds@1952	517	){
ds@1952	518	winFile *pFile = HANDLE_TO_WINFILE(phFile);
ds@1952	519	BOOL bReturn = FALSE;
ds@1952	520
ds@1952	521	if (!pFile->hMutex) return TRUE;
ds@1952	522	winceMutexAcquire(pFile->hMutex);
ds@1952	523
ds@1952	524	/* Releasing a reader lock or an exclusive lock */
ds@1952	525	if (dwFileOffsetLow >= SHARED_FIRST &&
ds@1952	526	dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE){
ds@1952	527	/* Did we have an exclusive lock? */
ds@1952	528	if (pFile->local.bExclusive){
ds@1952	529	pFile->local.bExclusive = FALSE;
ds@1952	530	pFile->shared->bExclusive = FALSE;
ds@1952	531	bReturn = TRUE;
ds@1952	532	}
ds@1952	533
ds@1952	534	/* Did we just have a reader lock? */
ds@1952	535	else if (pFile->local.nReaders){
ds@1952	536	pFile->local.nReaders --;
ds@1952	537	if (pFile->local.nReaders == 0)
ds@1952	538	{
ds@1952	539	pFile->shared->nReaders --;
ds@1952	540	}
ds@1952	541	bReturn = TRUE;
ds@1952	542	}
ds@1952	543	}
ds@1952	544
ds@1952	545	/* Releasing a pending lock */
ds@1952	546	else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){
ds@1952	547	if (pFile->local.bPending){
ds@1952	548	pFile->local.bPending = FALSE;
ds@1952	549	pFile->shared->bPending = FALSE;
ds@1952	550	bReturn = TRUE;
ds@1952	551	}
ds@1952	552	}
ds@1952	553	/* Releasing a reserved lock */
ds@1952	554	else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){
ds@1952	555	if (pFile->local.bReserved) {
ds@1952	556	pFile->local.bReserved = FALSE;
ds@1952	557	pFile->shared->bReserved = FALSE;
ds@1952	558	bReturn = TRUE;
ds@1952	559	}
ds@1952	560	}
ds@1952	561
ds@1952	562	winceMutexRelease(pFile->hMutex);
ds@1952	563	return bReturn;
ds@1952	564	}
ds@1952	565
ds@1952	566	/*
ds@1952	567	** An implementation of the LockFileEx() API of windows for wince
ds@1952	568	*/
ds@1952	569	static BOOL winceLockFileEx(
ds@1952	570	HANDLE *phFile,
ds@1952	571	DWORD dwFlags,
ds@1952	572	DWORD dwReserved,
ds@1952	573	DWORD nNumberOfBytesToLockLow,
ds@1952	574	DWORD nNumberOfBytesToLockHigh,
ds@1952	575	LPOVERLAPPED lpOverlapped
ds@1952	576	){
ds@1952	577	/* If the caller wants a shared read lock, forward this call
ds@1952	578	** to winceLockFile */
ds@1952	579	if (lpOverlapped->Offset == SHARED_FIRST &&
ds@1952	580	dwFlags == 1 &&
ds@1952	581	nNumberOfBytesToLockLow == SHARED_SIZE){
ds@1952	582	return winceLockFile(phFile, SHARED_FIRST, 0, 1, 0);
ds@1952	583	}
ds@1952	584	return FALSE;
ds@1952	585	}
ds@1952	586	/*
ds@1952	587	** End of the special code for wince
ds@1952	588	*****************************************************************************/
ds@1952	589	#endif /* OS_WINCE */
ds@1952	590
ds@1952	591	/*****************************************************************************
ds@1952	592	** The next group of routines implement the I/O methods specified
ds@1952	593	** by the sqlite3_io_methods object.
ds@1952	594	******************************************************************************/
ds@1952	595
ds@1952	596	/*
ds@1952	597	** Close a file.
ds@1952	598	**
ds@1952	599	** It is reported that an attempt to close a handle might sometimes
ds@1952	600	** fail. This is a very unreasonable result, but windows is notorious
ds@1952	601	** for being unreasonable so I do not doubt that it might happen. If
ds@1952	602	** the close fails, we pause for 100 milliseconds and try again. As
ds@1952	603	** many as MX_CLOSE_ATTEMPT attempts to close the handle are made before
ds@1952	604	** giving up and returning an error.
ds@1952	605	*/
ds@1952	606	#define MX_CLOSE_ATTEMPT 3
ds@1952	607	static int winClose(sqlite3_file *id){
ds@1952	608	int rc, cnt = 0;
ds@1952	609	winFile pFile = (winFile)id;
ds@1952	610	OSTRACE2("CLOSE %d\n", pFile->h);
ds@1952	611	do{
ds@1952	612	rc = CloseHandle(pFile->h);
ds@1952	613	}while( rc==0 && cnt++ < MX_CLOSE_ATTEMPT && (Sleep(100), 1) );
ds@1952	614	#if OS_WINCE
ds@1952	615	winceDestroyLock(pFile);
ds@1952	616	#endif
ds@1952	617	OpenCounter(-1);
ds@1952	618	return rc ? SQLITE_OK : SQLITE_IOERR;
ds@1952	619	}
ds@1952	620
ds@1952	621	/*
ds@1952	622	** Some microsoft compilers lack this definition.
ds@1952	623	*/
ds@1952	624	#ifndef INVALID_SET_FILE_POINTER
ds@1952	625	# define INVALID_SET_FILE_POINTER ((DWORD)-1)
ds@1952	626	#endif
ds@1952	627
ds@1952	628	/*
ds@1952	629	** Read data from a file into a buffer. Return SQLITE_OK if all
ds@1952	630	** bytes were read successfully and SQLITE_IOERR if anything goes
ds@1952	631	** wrong.
ds@1952	632	*/
ds@1952	633	static int winRead(
ds@1952	634	sqlite3_file id, / File to read from */
ds@1952	635	void pBuf, / Write content into this buffer */
ds@1952	636	int amt, /* Number of bytes to read */
ds@1952	637	sqlite3_int64 offset /* Begin reading at this offset */
ds@1952	638	){
ds@1952	639	LONG upperBits = (offset>>32) & 0x7fffffff;
ds@1952	640	LONG lowerBits = offset & 0xffffffff;
ds@1952	641	DWORD rc;
ds@1952	642	DWORD got;
ds@1952	643	winFile pFile = (winFile)id;
ds@1952	644	assert( id!=0 );
ds@1952	645	SimulateIOError(return SQLITE_IOERR_READ);
ds@1952	646	OSTRACE3("READ %d lock=%d\n", pFile->h, pFile->locktype);
ds@1952	647	rc = SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
ds@1952	648	if( rc==INVALID_SET_FILE_POINTER && GetLastError()!=NO_ERROR ){
ds@1952	649	return SQLITE_FULL;
ds@1952	650	}
ds@1952	651	if( !ReadFile(pFile->h, pBuf, amt, &got, 0) ){
ds@1952	652	return SQLITE_IOERR_READ;
ds@1952	653	}
ds@1952	654	if( got==(DWORD)amt ){
ds@1952	655	return SQLITE_OK;
ds@1952	656	}else{
ds@1952	657	memset(&((char*)pBuf)[got], 0, amt-got);
ds@1952	658	return SQLITE_IOERR_SHORT_READ;
ds@1952	659	}
ds@1952	660	}
ds@1952	661
ds@1952	662	/*
ds@1952	663	** Write data from a buffer into a file. Return SQLITE_OK on success
ds@1952	664	** or some other error code on failure.
ds@1952	665	*/
ds@1952	666	static int winWrite(
ds@1952	667	sqlite3_file id, / File to write into */
ds@1952	668	const void pBuf, / The bytes to be written */
ds@1952	669	int amt, /* Number of bytes to write */
ds@1952	670	sqlite3_int64 offset /* Offset into the file to begin writing at */
ds@1952	671	){
ds@1952	672	LONG upperBits = (offset>>32) & 0x7fffffff;
ds@1952	673	LONG lowerBits = offset & 0xffffffff;
ds@1952	674	DWORD rc;
ds@1952	675	DWORD wrote;
ds@1952	676	winFile pFile = (winFile)id;
ds@1952	677	assert( id!=0 );
ds@1952	678	SimulateIOError(return SQLITE_IOERR_WRITE);
ds@1952	679	SimulateDiskfullError(return SQLITE_FULL);
ds@1952	680	OSTRACE3("WRITE %d lock=%d\n", pFile->h, pFile->locktype);
ds@1952	681	rc = SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
ds@1952	682	if( rc==INVALID_SET_FILE_POINTER && GetLastError()!=NO_ERROR ){
ds@1952	683	return SQLITE_FULL;
ds@1952	684	}
ds@1952	685	assert( amt>0 );
ds@1952	686	while(
ds@1952	687	amt>0
ds@1952	688	&& (rc = WriteFile(pFile->h, pBuf, amt, &wrote, 0))!=0
ds@1952	689	&& wrote>0
ds@1952	690	){
ds@1952	691	amt -= wrote;
ds@1952	692	pBuf = &((char*)pBuf)[wrote];
ds@1952	693	}
ds@1952	694	if( !rc \|\| amt>(int)wrote ){
ds@1952	695	return SQLITE_FULL;
ds@1952	696	}
ds@1952	697	return SQLITE_OK;
ds@1952	698	}
ds@1952	699
ds@1952	700	/*
ds@1952	701	** Truncate an open file to a specified size
ds@1952	702	*/
ds@1952	703	static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){
ds@1952	704	LONG upperBits = (nByte>>32) & 0x7fffffff;
ds@1952	705	LONG lowerBits = nByte & 0xffffffff;
ds@1952	706	winFile pFile = (winFile)id;
ds@1952	707	OSTRACE3("TRUNCATE %d %lld\n", pFile->h, nByte);
ds@1952	708	SimulateIOError(return SQLITE_IOERR_TRUNCATE);
ds@1952	709	SetFilePointer(pFile->h, lowerBits, &upperBits, FILE_BEGIN);
ds@1952	710	SetEndOfFile(pFile->h);
ds@1952	711	return SQLITE_OK;
ds@1952	712	}
ds@1952	713
ds@1952	714	#ifdef SQLITE_TEST
ds@1952	715	/*
ds@1952	716	** Count the number of fullsyncs and normal syncs. This is used to test
ds@1952	717	** that syncs and fullsyncs are occuring at the right times.
ds@1952	718	*/
ds@1952	719	int sqlite3_sync_count = 0;
ds@1952	720	int sqlite3_fullsync_count = 0;
ds@1952	721	#endif
ds@1952	722
ds@1952	723	/*
ds@1952	724	** Make sure all writes to a particular file are committed to disk.
ds@1952	725	*/
ds@1952	726	static int winSync(sqlite3_file *id, int flags){
ds@1952	727	winFile pFile = (winFile)id;
ds@1952	728	OSTRACE3("SYNC %d lock=%d\n", pFile->h, pFile->locktype);
ds@1952	729	#ifdef SQLITE_TEST
ds@1952	730	if( flags & SQLITE_SYNC_FULL ){
ds@1952	731	sqlite3_fullsync_count++;
ds@1952	732	}
ds@1952	733	sqlite3_sync_count++;
ds@1952	734	#endif
ds@1952	735	if( FlushFileBuffers(pFile->h) ){
ds@1952	736	return SQLITE_OK;
ds@1952	737	}else{
ds@1952	738	return SQLITE_IOERR;
ds@1952	739	}
ds@1952	740	}
ds@1952	741
ds@1952	742	/*
ds@1952	743	** Determine the current size of a file in bytes
ds@1952	744	*/
ds@1952	745	static int winFileSize(sqlite3_file id, sqlite3_int64 pSize){
ds@1952	746	winFile pFile = (winFile)id;
ds@1952	747	DWORD upperBits, lowerBits;
ds@1952	748	SimulateIOError(return SQLITE_IOERR_FSTAT);
ds@1952	749	lowerBits = GetFileSize(pFile->h, &upperBits);
ds@1952	750	*pSize = (((sqlite3_int64)upperBits)<<32) + lowerBits;
ds@1952	751	return SQLITE_OK;
ds@1952	752	}
ds@1952	753
ds@1952	754	/*
ds@1952	755	** LOCKFILE_FAIL_IMMEDIATELY is undefined on some Windows systems.
ds@1952	756	*/
ds@1952	757	#ifndef LOCKFILE_FAIL_IMMEDIATELY
ds@1952	758	# define LOCKFILE_FAIL_IMMEDIATELY 1
ds@1952	759	#endif
ds@1952	760
ds@1952	761	/*
ds@1952	762	** Acquire a reader lock.
ds@1952	763	** Different API routines are called depending on whether or not this
ds@1952	764	** is Win95 or WinNT.
ds@1952	765	*/
ds@1952	766	static int getReadLock(winFile *pFile){
ds@1952	767	int res;
ds@1952	768	if( isNT() ){
ds@1952	769	OVERLAPPED ovlp;
ds@1952	770	ovlp.Offset = SHARED_FIRST;
ds@1952	771	ovlp.OffsetHigh = 0;
ds@1952	772	ovlp.hEvent = 0;
ds@1952	773	res = LockFileEx(pFile->h, LOCKFILE_FAIL_IMMEDIATELY,
ds@1952	774	0, SHARED_SIZE, 0, &ovlp);
ds@1952	775	}else{
ds@1952	776	int lk;
ds@1952	777	sqlite3Randomness(sizeof(lk), &lk);
ds@1952	778	pFile->sharedLockByte = (lk & 0x7fffffff)%(SHARED_SIZE - 1);
ds@1952	779	res = LockFile(pFile->h, SHARED_FIRST+pFile->sharedLockByte, 0, 1, 0);
ds@1952	780	}
ds@1952	781	return res;
ds@1952	782	}
ds@1952	783
ds@1952	784	/*
ds@1952	785	** Undo a readlock
ds@1952	786	*/
ds@1952	787	static int unlockReadLock(winFile *pFile){
ds@1952	788	int res;
ds@1952	789	if( isNT() ){
ds@1952	790	res = UnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
ds@1952	791	}else{
ds@1952	792	res = UnlockFile(pFile->h, SHARED_FIRST + pFile->sharedLockByte, 0, 1, 0);
ds@1952	793	}
ds@1952	794	return res;
ds@1952	795	}
ds@1952	796
ds@1952	797	/*
ds@1952	798	** Lock the file with the lock specified by parameter locktype - one
ds@1952	799	** of the following:
ds@1952	800	**
ds@1952	801	** (1) SHARED_LOCK
ds@1952	802	** (2) RESERVED_LOCK
ds@1952	803	** (3) PENDING_LOCK
ds@1952	804	** (4) EXCLUSIVE_LOCK
ds@1952	805	**
ds@1952	806	** Sometimes when requesting one lock state, additional lock states
ds@1952	807	** are inserted in between. The locking might fail on one of the later
ds@1952	808	** transitions leaving the lock state different from what it started but
ds@1952	809	** still short of its goal. The following chart shows the allowed
ds@1952	810	** transitions and the inserted intermediate states:
ds@1952	811	**
ds@1952	812	** UNLOCKED -> SHARED
ds@1952	813	** SHARED -> RESERVED
ds@1952	814	** SHARED -> (PENDING) -> EXCLUSIVE
ds@1952	815	** RESERVED -> (PENDING) -> EXCLUSIVE
ds@1952	816	** PENDING -> EXCLUSIVE
ds@1952	817	**
ds@1952	818	** This routine will only increase a lock. The winUnlock() routine
ds@1952	819	** erases all locks at once and returns us immediately to locking level 0.
ds@1952	820	** It is not possible to lower the locking level one step at a time. You
ds@1952	821	** must go straight to locking level 0.
ds@1952	822	*/
ds@1952	823	static int winLock(sqlite3_file *id, int locktype){
ds@1952	824	int rc = SQLITE_OK; /* Return code from subroutines */
ds@1952	825	int res = 1; /* Result of a windows lock call */
ds@1952	826	int newLocktype; /* Set pFile->locktype to this value before exiting */
ds@1952	827	int gotPendingLock = 0;/* True if we acquired a PENDING lock this time */
ds@1952	828	winFile pFile = (winFile)id;
ds@1952	829
ds@1952	830	assert( pFile!=0 );
ds@1952	831	OSTRACE5("LOCK %d %d was %d(%d)\n",
ds@1952	832	pFile->h, locktype, pFile->locktype, pFile->sharedLockByte);
ds@1952	833
ds@1952	834	/* If there is already a lock of this type or more restrictive on the
ds@1952	835	** OsFile, do nothing. Don't use the end_lock: exit path, as
ds@1952	836	** sqlite3OsEnterMutex() hasn't been called yet.
ds@1952	837	*/
ds@1952	838	if( pFile->locktype>=locktype ){
ds@1952	839	return SQLITE_OK;
ds@1952	840	}
ds@1952	841
ds@1952	842	/* Make sure the locking sequence is correct
ds@1952	843	*/
ds@1952	844	assert( pFile->locktype!=NO_LOCK \|\| locktype==SHARED_LOCK );
ds@1952	845	assert( locktype!=PENDING_LOCK );
ds@1952	846	assert( locktype!=RESERVED_LOCK \|\| pFile->locktype==SHARED_LOCK );
ds@1952	847
ds@1952	848	/* Lock the PENDING_LOCK byte if we need to acquire a PENDING lock or
ds@1952	849	** a SHARED lock. If we are acquiring a SHARED lock, the acquisition of
ds@1952	850	** the PENDING_LOCK byte is temporary.
ds@1952	851	*/
ds@1952	852	newLocktype = pFile->locktype;
ds@1952	853	if( pFile->locktype==NO_LOCK
ds@1952	854	\|\| (locktype==EXCLUSIVE_LOCK && pFile->locktype==RESERVED_LOCK)
ds@1952	855	){
ds@1952	856	int cnt = 3;
ds@1952	857	while( cnt-->0 && (res = LockFile(pFile->h, PENDING_BYTE, 0, 1, 0))==0 ){
ds@1952	858	/* Try 3 times to get the pending lock. The pending lock might be
ds@1952	859	** held by another reader process who will release it momentarily.
ds@1952	860	*/
ds@1952	861	OSTRACE2("could not get a PENDING lock. cnt=%d\n", cnt);
ds@1952	862	Sleep(1);
ds@1952	863	}
ds@1952	864	gotPendingLock = res;
ds@1952	865	}
ds@1952	866
ds@1952	867	/* Acquire a shared lock
ds@1952	868	*/
ds@1952	869	if( locktype==SHARED_LOCK && res ){
ds@1952	870	assert( pFile->locktype==NO_LOCK );
ds@1952	871	res = getReadLock(pFile);
ds@1952	872	if( res ){
ds@1952	873	newLocktype = SHARED_LOCK;
ds@1952	874	}
ds@1952	875	}
ds@1952	876
ds@1952	877	/* Acquire a RESERVED lock
ds@1952	878	*/
ds@1952	879	if( locktype==RESERVED_LOCK && res ){
ds@1952	880	assert( pFile->locktype==SHARED_LOCK );
ds@1952	881	res = LockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
ds@1952	882	if( res ){
ds@1952	883	newLocktype = RESERVED_LOCK;
ds@1952	884	}
ds@1952	885	}
ds@1952	886
ds@1952	887	/* Acquire a PENDING lock
ds@1952	888	*/
ds@1952	889	if( locktype==EXCLUSIVE_LOCK && res ){
ds@1952	890	newLocktype = PENDING_LOCK;
ds@1952	891	gotPendingLock = 0;
ds@1952	892	}
ds@1952	893
ds@1952	894	/* Acquire an EXCLUSIVE lock
ds@1952	895	*/
ds@1952	896	if( locktype==EXCLUSIVE_LOCK && res ){
ds@1952	897	assert( pFile->locktype>=SHARED_LOCK );
ds@1952	898	res = unlockReadLock(pFile);
ds@1952	899	OSTRACE2("unreadlock = %d\n", res);
ds@1952	900	res = LockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
ds@1952	901	if( res ){
ds@1952	902	newLocktype = EXCLUSIVE_LOCK;
ds@1952	903	}else{
ds@1952	904	OSTRACE2("error-code = %d\n", GetLastError());
ds@1952	905	getReadLock(pFile);
ds@1952	906	}
ds@1952	907	}
ds@1952	908
ds@1952	909	/* If we are holding a PENDING lock that ought to be released, then
ds@1952	910	** release it now.
ds@1952	911	*/
ds@1952	912	if( gotPendingLock && locktype==SHARED_LOCK ){
ds@1952	913	UnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
ds@1952	914	}
ds@1952	915
ds@1952	916	/* Update the state of the lock has held in the file descriptor then
ds@1952	917	** return the appropriate result code.
ds@1952	918	*/
ds@1952	919	if( res ){
ds@1952	920	rc = SQLITE_OK;
ds@1952	921	}else{
ds@1952	922	OSTRACE4("LOCK FAILED %d trying for %d but got %d\n", pFile->h,
ds@1952	923	locktype, newLocktype);
ds@1952	924	rc = SQLITE_BUSY;
ds@1952	925	}
ds@1952	926	pFile->locktype = newLocktype;
ds@1952	927	return rc;
ds@1952	928	}
ds@1952	929
ds@1952	930	/*
ds@1952	931	** This routine checks if there is a RESERVED lock held on the specified
ds@1952	932	** file by this or any other process. If such a lock is held, return
ds@1952	933	** non-zero, otherwise zero.
ds@1952	934	*/
ds@1952	935	static int winCheckReservedLock(sqlite3_file *id){
ds@1952	936	int rc;
ds@1952	937	winFile pFile = (winFile)id;
ds@1952	938	assert( pFile!=0 );
ds@1952	939	if( pFile->locktype>=RESERVED_LOCK ){
ds@1952	940	rc = 1;
ds@1952	941	OSTRACE3("TEST WR-LOCK %d %d (local)\n", pFile->h, rc);
ds@1952	942	}else{
ds@1952	943	rc = LockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
ds@1952	944	if( rc ){
ds@1952	945	UnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
ds@1952	946	}
ds@1952	947	rc = !rc;
ds@1952	948	OSTRACE3("TEST WR-LOCK %d %d (remote)\n", pFile->h, rc);
ds@1952	949	}
ds@1952	950	return rc;
ds@1952	951	}
ds@1952	952
ds@1952	953	/*
ds@1952	954	** Lower the locking level on file descriptor id to locktype. locktype
ds@1952	955	** must be either NO_LOCK or SHARED_LOCK.
ds@1952	956	**
ds@1952	957	** If the locking level of the file descriptor is already at or below
ds@1952	958	** the requested locking level, this routine is a no-op.
ds@1952	959	**
ds@1952	960	** It is not possible for this routine to fail if the second argument
ds@1952	961	** is NO_LOCK. If the second argument is SHARED_LOCK then this routine
ds@1952	962	** might return SQLITE_IOERR;
ds@1952	963	*/
ds@1952	964	static int winUnlock(sqlite3_file *id, int locktype){
ds@1952	965	int type;
ds@1952	966	winFile pFile = (winFile)id;
ds@1952	967	int rc = SQLITE_OK;
ds@1952	968	assert( pFile!=0 );
ds@1952	969	assert( locktype<=SHARED_LOCK );
ds@1952	970	OSTRACE5("UNLOCK %d to %d was %d(%d)\n", pFile->h, locktype,
ds@1952	971	pFile->locktype, pFile->sharedLockByte);
ds@1952	972	type = pFile->locktype;
ds@1952	973	if( type>=EXCLUSIVE_LOCK ){
ds@1952	974	UnlockFile(pFile->h, SHARED_FIRST, 0, SHARED_SIZE, 0);
ds@1952	975	if( locktype==SHARED_LOCK && !getReadLock(pFile) ){
ds@1952	976	/* This should never happen. We should always be able to
ds@1952	977	** reacquire the read lock */
ds@1952	978	rc = SQLITE_IOERR_UNLOCK;
ds@1952	979	}
ds@1952	980	}
ds@1952	981	if( type>=RESERVED_LOCK ){
ds@1952	982	UnlockFile(pFile->h, RESERVED_BYTE, 0, 1, 0);
ds@1952	983	}
ds@1952	984	if( locktype==NO_LOCK && type>=SHARED_LOCK ){
ds@1952	985	unlockReadLock(pFile);
ds@1952	986	}
ds@1952	987	if( type>=PENDING_LOCK ){
ds@1952	988	UnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
ds@1952	989	}
ds@1952	990	pFile->locktype = locktype;
ds@1952	991	return rc;
ds@1952	992	}
ds@1952	993
ds@1952	994	/*
ds@1952	995	** Control and query of the open file handle.
ds@1952	996	*/
ds@1952	997	static int winFileControl(sqlite3_file id, int op, void pArg){
ds@1952	998	switch( op ){
ds@1952	999	case SQLITE_FCNTL_LOCKSTATE: {
ds@1952	1000	(int)pArg = ((winFile*)id)->locktype;
ds@1952	1001	return SQLITE_OK;
ds@1952	1002	}
ds@1952	1003	}
ds@1952	1004	return SQLITE_ERROR;
ds@1952	1005	}
ds@1952	1006
ds@1952	1007	/*
ds@1952	1008	** Return the sector size in bytes of the underlying block device for
ds@1952	1009	** the specified file. This is almost always 512 bytes, but may be
ds@1952	1010	** larger for some devices.
ds@1952	1011	**
ds@1952	1012	** SQLite code assumes this function cannot fail. It also assumes that
ds@1952	1013	** if two files are created in the same file-system directory (i.e.
ds@1952	1014	** a database and it's journal file) that the sector size will be the
ds@1952	1015	** same for both.
ds@1952	1016	*/
ds@1952	1017	static int winSectorSize(sqlite3_file *id){
ds@1952	1018	return SQLITE_DEFAULT_SECTOR_SIZE;
ds@1952	1019	}
ds@1952	1020
ds@1952	1021	/*
ds@1952	1022	** Return a vector of device characteristics.
ds@1952	1023	*/
ds@1952	1024	static int winDeviceCharacteristics(sqlite3_file *id){
ds@1952	1025	return 0;
ds@1952	1026	}
ds@1952	1027
ds@1952	1028	/*
ds@1952	1029	** This vector defines all the methods that can operate on an
ds@1952	1030	** sqlite3_file for win32.
ds@1952	1031	*/
ds@1952	1032	static const sqlite3_io_methods winIoMethod = {
ds@1952	1033	1, /* iVersion */
ds@1952	1034	winClose,
ds@1952	1035	winRead,
ds@1952	1036	winWrite,
ds@1952	1037	winTruncate,
ds@1952	1038	winSync,
ds@1952	1039	winFileSize,
ds@1952	1040	winLock,
ds@1952	1041	winUnlock,
ds@1952	1042	winCheckReservedLock,
ds@1952	1043	winFileControl,
ds@1952	1044	winSectorSize,
ds@1952	1045	winDeviceCharacteristics
ds@1952	1046	};
ds@1952	1047
ds@1952	1048	/***************************************************************************
ds@1952	1049	** Here ends the I/O methods that form the sqlite3_io_methods object.
ds@1952	1050	**
ds@1952	1051	** The next block of code implements the VFS methods.
ds@1952	1052	****************************************************************************/
ds@1952	1053
ds@1952	1054	/*
ds@1952	1055	** Convert a UTF-8 filename into whatever form the underlying
ds@1952	1056	** operating system wants filenames in. Space to hold the result
ds@1952	1057	** is obtained from malloc and must be freed by the calling
ds@1952	1058	** function.
ds@1952	1059	*/
ds@1952	1060	static void convertUtf8Filename(const char zFilename){
ds@1952	1061	void *zConverted = 0;
ds@1952	1062	if( isNT() ){
ds@1952	1063	zConverted = utf8ToUnicode(zFilename);
ds@1952	1064	}else{
ds@1952	1065	zConverted = utf8ToMbcs(zFilename);
ds@1952	1066	}
ds@1952	1067	/* caller will handle out of memory */
ds@1952	1068	return zConverted;
ds@1952	1069	}
ds@1952	1070
ds@1952	1071	/*
ds@1952	1072	** Open a file.
ds@1952	1073	*/
ds@1952	1074	static int winOpen(
ds@1952	1075	sqlite3_vfs pVfs, / Not used */
ds@1952	1076	const char zName, / Name of the file (UTF-8) */
ds@1952	1077	sqlite3_file id, / Write the SQLite file handle here */
ds@1952	1078	int flags, /* Open mode flags */
ds@1952	1079	int pOutFlags / Status return flags */
ds@1952	1080	){
ds@1952	1081	HANDLE h;
ds@1952	1082	DWORD dwDesiredAccess;
ds@1952	1083	DWORD dwShareMode;
ds@1952	1084	DWORD dwCreationDisposition;
ds@1952	1085	DWORD dwFlagsAndAttributes = 0;
ds@1952	1086	winFile pFile = (winFile)id;
ds@1952	1087	void *zConverted = convertUtf8Filename(zName);
ds@1952	1088	if( zConverted==0 ){
ds@1952	1089	return SQLITE_NOMEM;
ds@1952	1090	}
ds@1952	1091
ds@1952	1092	if( flags & SQLITE_OPEN_READWRITE ){
ds@1952	1093	dwDesiredAccess = GENERIC_READ \| GENERIC_WRITE;
ds@1952	1094	}else{
ds@1952	1095	dwDesiredAccess = GENERIC_READ;
ds@1952	1096	}
ds@1952	1097	if( flags & SQLITE_OPEN_CREATE ){
ds@1952	1098	dwCreationDisposition = OPEN_ALWAYS;
ds@1952	1099	}else{
ds@1952	1100	dwCreationDisposition = OPEN_EXISTING;
ds@1952	1101	}
ds@1952	1102	if( flags & SQLITE_OPEN_MAIN_DB ){
ds@1952	1103	dwShareMode = FILE_SHARE_READ \| FILE_SHARE_WRITE;
ds@1952	1104	}else{
ds@1952	1105	dwShareMode = 0;
ds@1952	1106	}
ds@1952	1107	if( flags & (SQLITE_OPEN_TEMP_DB \| SQLITE_OPEN_TEMP_JOURNAL
ds@1952	1108	\| SQLITE_OPEN_SUBJOURNAL) ){
ds@1952	1109	dwFlagsAndAttributes = FILE_ATTRIBUTE_TEMPORARY
ds@1952	1110	\| FILE_ATTRIBUTE_HIDDEN
ds@1952	1111	\| FILE_FLAG_DELETE_ON_CLOSE;
ds@1952	1112	}else{
ds@1952	1113	dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
ds@1952	1114	}
ds@1952	1115	if( flags & (SQLITE_OPEN_MAIN_DB \| SQLITE_OPEN_TEMP_DB) ){
ds@1952	1116	dwFlagsAndAttributes \|= FILE_FLAG_RANDOM_ACCESS;
ds@1952	1117	}else{
ds@1952	1118	dwFlagsAndAttributes \|= FILE_FLAG_SEQUENTIAL_SCAN;
ds@1952	1119	}
ds@1952	1120	if( isNT() ){
ds@1952	1121	h = CreateFileW((WCHAR*)zConverted,
ds@1952	1122	dwDesiredAccess,
ds@1952	1123	dwShareMode,
ds@1952	1124	NULL,
ds@1952	1125	dwCreationDisposition,
ds@1952	1126	dwFlagsAndAttributes,
ds@1952	1127	NULL
ds@1952	1128	);
ds@1952	1129	}else{
ds@1952	1130	#if OS_WINCE
ds@1952	1131	return SQLITE_NOMEM;
ds@1952	1132	#else
ds@1952	1133	h = CreateFileA((char*)zConverted,
ds@1952	1134	dwDesiredAccess,
ds@1952	1135	dwShareMode,
ds@1952	1136	NULL,
ds@1952	1137	dwCreationDisposition,
ds@1952	1138	dwFlagsAndAttributes,
ds@1952	1139	NULL
ds@1952	1140	);
ds@1952	1141	#endif
ds@1952	1142	}
ds@1952	1143	if( h==INVALID_HANDLE_VALUE ){
ds@1952	1144	free(zConverted);
ds@1952	1145	if( flags & SQLITE_OPEN_READWRITE ){
ds@1952	1146	return winOpen(0, zName, id,
ds@1952	1147	((flags\|SQLITE_OPEN_READONLY)&~SQLITE_OPEN_READWRITE), pOutFlags);
ds@1952	1148	}else{
ds@1952	1149	return SQLITE_CANTOPEN;
ds@1952	1150	}
ds@1952	1151	}
ds@1952	1152	if( pOutFlags ){
ds@1952	1153	if( flags & SQLITE_OPEN_READWRITE ){
ds@1952	1154	*pOutFlags = SQLITE_OPEN_READWRITE;
ds@1952	1155	}else{
ds@1952	1156	*pOutFlags = SQLITE_OPEN_READONLY;
ds@1952	1157	}
ds@1952	1158	}
ds@1952	1159	memset(pFile, 0, sizeof(*pFile));
ds@1952	1160	pFile->pMethod = &winIoMethod;
ds@1952	1161	pFile->h = h;
ds@1952	1162	#if OS_WINCE
ds@1952	1163	if( (flags & (SQLITE_OPEN_READWRITE\|SQLITE_OPEN_MAIN_DB)) ==
ds@1952	1164	(SQLITE_OPEN_READWRITE\|SQLITE_OPEN_MAIN_DB)
ds@1952	1165	&& !winceCreateLock(zFilename, pFile)
ds@1952	1166	){
ds@1952	1167	CloseHandle(h);
ds@1952	1168	free(zConverted);
ds@1952	1169	return SQLITE_CANTOPEN;
ds@1952	1170	}
ds@1952	1171	if( dwFlagsAndAttributes & FILE_FLAG_DELETE_ON_CLOSE ){
ds@1952	1172	pFile->zDeleteOnClose = zConverted;
ds@1952	1173	}else
ds@1952	1174	#endif
ds@1952	1175	{
ds@1952	1176	free(zConverted);
ds@1952	1177	}
ds@1952	1178	OpenCounter(+1);
ds@1952	1179	return SQLITE_OK;
ds@1952	1180	}
ds@1952	1181
ds@1952	1182	/*
ds@1952	1183	** Delete the named file.
ds@1952	1184	**
ds@1952	1185	** Note that windows does not allow a file to be deleted if some other
ds@1952	1186	** process has it open. Sometimes a virus scanner or indexing program
ds@1952	1187	** will open a journal file shortly after it is created in order to do
ds@1952	1188	** whatever it is it does. While this other process is holding the
ds@1952	1189	** file open, we will be unable to delete it. To work around this
ds@1952	1190	** problem, we delay 100 milliseconds and try to delete again. Up
ds@1952	1191	** to MX_DELETION_ATTEMPTs deletion attempts are run before giving
ds@1952	1192	** up and returning an error.
ds@1952	1193	*/
ds@1952	1194	#define MX_DELETION_ATTEMPTS 3
ds@1952	1195	static int winDelete(
ds@1952	1196	sqlite3_vfs pVfs, / Not used on win32 */
ds@1952	1197	const char zFilename, / Name of file to delete */
ds@1952	1198	int syncDir /* Not used on win32 */
ds@1952	1199	){
ds@1952	1200	int cnt = 0;
ds@1952	1201	int rc;
ds@1952	1202	void *zConverted = convertUtf8Filename(zFilename);
ds@1952	1203	if( zConverted==0 ){
ds@1952	1204	return SQLITE_NOMEM;
ds@1952	1205	}
ds@1952	1206	SimulateIOError(return SQLITE_IOERR_DELETE);
ds@1952	1207	if( isNT() ){
ds@1952	1208	do{
ds@1952	1209	rc = DeleteFileW(zConverted);
ds@1952	1210	}while( rc==0 && GetFileAttributesW(zConverted)!=0xffffffff
ds@1952	1211	&& cnt++ < MX_DELETION_ATTEMPTS && (Sleep(100), 1) );
ds@1952	1212	}else{
ds@1952	1213	#if OS_WINCE
ds@1952	1214	return SQLITE_NOMEM;
ds@1952	1215	#else
ds@1952	1216	do{
ds@1952	1217	rc = DeleteFileA(zConverted);
ds@1952	1218	}while( rc==0 && GetFileAttributesA(zConverted)!=0xffffffff
ds@1952	1219	&& cnt++ < MX_DELETION_ATTEMPTS && (Sleep(100), 1) );
ds@1952	1220	#endif
ds@1952	1221	}
ds@1952	1222	free(zConverted);
ds@1952	1223	OSTRACE2("DELETE \"%s\"\n", zFilename);
ds@1952	1224	return rc!=0 ? SQLITE_OK : SQLITE_IOERR;
ds@1952	1225	}
ds@1952	1226
ds@1952	1227	/*
ds@1952	1228	** Check the existance and status of a file.
ds@1952	1229	*/
ds@1952	1230	static int winAccess(
ds@1952	1231	sqlite3_vfs pVfs, / Not used on win32 */
ds@1952	1232	const char zFilename, / Name of file to check */
ds@1952	1233	int flags /* Type of test to make on this file */
ds@1952	1234	){
ds@1952	1235	DWORD attr;
ds@1952	1236	int rc;
ds@1952	1237	void *zConverted = convertUtf8Filename(zFilename);
ds@1952	1238	if( zConverted==0 ){
ds@1952	1239	return SQLITE_NOMEM;
ds@1952	1240	}
ds@1952	1241	if( isNT() ){
ds@1952	1242	attr = GetFileAttributesW((WCHAR*)zConverted);
ds@1952	1243	}else{
ds@1952	1244	#if OS_WINCE
ds@1952	1245	return SQLITE_NOMEM;
ds@1952	1246	#else
ds@1952	1247	attr = GetFileAttributesA((char*)zConverted);
ds@1952	1248	#endif
ds@1952	1249	}
ds@1952	1250	free(zConverted);
ds@1952	1251	switch( flags ){
ds@1952	1252	case SQLITE_ACCESS_READ:
ds@1952	1253	case SQLITE_ACCESS_EXISTS:
ds@1952	1254	rc = attr!=0xffffffff;
ds@1952	1255	break;
ds@1952	1256	case SQLITE_ACCESS_READWRITE:
ds@1952	1257	rc = (attr & FILE_ATTRIBUTE_READONLY)==0;
ds@1952	1258	break;
ds@1952	1259	default:
ds@1952	1260	assert(!"Invalid flags argument");
ds@1952	1261	}
ds@1952	1262	return rc;
ds@1952	1263	}
ds@1952	1264
ds@1952	1265
ds@1952	1266	/*
ds@1952	1267	** Create a temporary file name in zBuf. zBuf must be big enough to
ds@1952	1268	** hold at pVfs->mxPathname characters.
ds@1952	1269	*/
ds@1952	1270	static int winGetTempname(sqlite3_vfs pVfs, int nBuf, char zBuf){
ds@1952	1271	static char zChars[] =
ds@1952	1272	"abcdefghijklmnopqrstuvwxyz"
ds@1952	1273	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
ds@1952	1274	"0123456789";
ds@1952	1275	int i, j;
ds@1952	1276	char zTempPath[MAX_PATH+1];
ds@1952	1277	if( sqlite3_temp_directory ){
ds@1952	1278	sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", sqlite3_temp_directory);
ds@1952	1279	}else if( isNT() ){
ds@1952	1280	char *zMulti;
ds@1952	1281	WCHAR zWidePath[MAX_PATH];
ds@1952	1282	GetTempPathW(MAX_PATH-30, zWidePath);
ds@1952	1283	zMulti = unicodeToUtf8(zWidePath);
ds@1952	1284	if( zMulti ){
ds@1952	1285	sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zMulti);
ds@1952	1286	free(zMulti);
ds@1952	1287	}else{
ds@1952	1288	return SQLITE_NOMEM;
ds@1952	1289	}
ds@1952	1290	}else{
ds@1952	1291	char *zUtf8;
ds@1952	1292	char zMbcsPath[MAX_PATH];
ds@1952	1293	GetTempPathA(MAX_PATH-30, zMbcsPath);
ds@1952	1294	zUtf8 = mbcsToUtf8(zMbcsPath);
ds@1952	1295	if( zUtf8 ){
ds@1952	1296	sqlite3_snprintf(MAX_PATH-30, zTempPath, "%s", zUtf8);
ds@1952	1297	free(zUtf8);
ds@1952	1298	}else{
ds@1952	1299	return SQLITE_NOMEM;
ds@1952	1300	}
ds@1952	1301	}
ds@1952	1302	for(i=strlen(zTempPath); i>0 && zTempPath[i-1]=='\\'; i--){}
ds@1952	1303	zTempPath[i] = 0;
ds@1952	1304	sqlite3_snprintf(pVfs->mxPathname-30, zBuf,
ds@1952	1305	"%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPath);
ds@1952	1306	j = strlen(zBuf);
ds@1952	1307	sqlite3Randomness(20, &zBuf[j]);
ds@1952	1308	for(i=0; i<20; i++, j++){
ds@1952	1309	zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
ds@1952	1310	}
ds@1952	1311	zBuf[j] = 0;
ds@1952	1312	OSTRACE2("TEMP FILENAME: %s\n", zBuf);
ds@1952	1313	return SQLITE_OK;
ds@1952	1314	}
ds@1952	1315
ds@1952	1316	/*
ds@1952	1317	** Turn a relative pathname into a full pathname. Write the full
ds@1952	1318	** pathname into zOut[]. zOut[] will be at least pVfs->mxPathname
ds@1952	1319	** bytes in size.
ds@1952	1320	*/
ds@1952	1321	static int winFullPathname(
ds@1952	1322	sqlite3_vfs pVfs, / Pointer to vfs object */
ds@1952	1323	const char zRelative, / Possibly relative input path */
ds@1952	1324	int nFull, /* Size of output buffer in bytes */
ds@1952	1325	char zFull / Output buffer */
ds@1952	1326	){
ds@1952	1327
ds@1952	1328	#if defined(__CYGWIN__)
ds@1952	1329	cygwin_conv_to_full_win32_path(zRelative, zFull);
ds@1952	1330	return SQLITE_OK;
ds@1952	1331	#endif
ds@1952	1332
ds@1952	1333	#if OS_WINCE
ds@1952	1334	/* WinCE has no concept of a relative pathname, or so I am told. */
ds@1952	1335	sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zRelative);
ds@1952	1336	#endif
ds@1952	1337
ds@1952	1338	#if !OS_WINCE && !defined(__CYGWIN__)
ds@1952	1339	int nByte;
ds@1952	1340	void *zConverted;
ds@1952	1341	char *zOut;
ds@1952	1342	zConverted = convertUtf8Filename(zRelative);
ds@1952	1343	if( isNT() ){
ds@1952	1344	WCHAR *zTemp;
ds@1952	1345	nByte = GetFullPathNameW((WCHAR*)zConverted, 0, 0, 0) + 3;
ds@1952	1346	zTemp = malloc( nByte*sizeof(zTemp[0]) );
ds@1952	1347	if( zTemp==0 ){
ds@1952	1348	free(zConverted);
ds@1952	1349	return SQLITE_NOMEM;
ds@1952	1350	}
ds@1952	1351	GetFullPathNameW((WCHAR*)zConverted, nByte, zTemp, 0);
ds@1952	1352	free(zConverted);
ds@1952	1353	zOut = unicodeToUtf8(zTemp);
ds@1952	1354	free(zTemp);
ds@1952	1355	}else{
ds@1952	1356	char *zTemp;
ds@1952	1357	nByte = GetFullPathNameA((char*)zConverted, 0, 0, 0) + 3;
ds@1952	1358	zTemp = malloc( nByte*sizeof(zTemp[0]) );
ds@1952	1359	if( zTemp==0 ){
ds@1952	1360	free(zConverted);
ds@1952	1361	return SQLITE_NOMEM;
ds@1952	1362	}
ds@1952	1363	GetFullPathNameA((char*)zConverted, nByte, zTemp, 0);
ds@1952	1364	free(zConverted);
ds@1952	1365	zOut = mbcsToUtf8(zTemp);
ds@1952	1366	free(zTemp);
ds@1952	1367	}
ds@1952	1368	if( zOut ){
ds@1952	1369	sqlite3_snprintf(pVfs->mxPathname, zFull, "%s", zOut);
ds@1952	1370	free(zOut);
ds@1952	1371	return SQLITE_OK;
ds@1952	1372	}else{
ds@1952	1373	return SQLITE_NOMEM;
ds@1952	1374	}
ds@1952	1375	#endif
ds@1952	1376	}
ds@1952	1377
ds@1952	1378	#ifndef SQLITE_OMIT_LOAD_EXTENSION
ds@1952	1379	/*
ds@1952	1380	** Interfaces for opening a shared library, finding entry points
ds@1952	1381	** within the shared library, and closing the shared library.
ds@1952	1382	*/
ds@1952	1383	/*
ds@1952	1384	** Interfaces for opening a shared library, finding entry points
ds@1952	1385	** within the shared library, and closing the shared library.
ds@1952	1386	*/
ds@1952	1387	static void winDlOpen(sqlite3_vfs pVfs, const char *zFilename){
ds@1952	1388	HANDLE h;
ds@1952	1389	void *zConverted = convertUtf8Filename(zFilename);
ds@1952	1390	if( zConverted==0 ){
ds@1952	1391	return 0;
ds@1952	1392	}
ds@1952	1393	if( isNT() ){
ds@1952	1394	h = LoadLibraryW((WCHAR*)zConverted);
ds@1952	1395	}else{
ds@1952	1396	#if OS_WINCE
ds@1952	1397	return 0;
ds@1952	1398	#else
ds@1952	1399	h = LoadLibraryA((char*)zConverted);
ds@1952	1400	#endif
ds@1952	1401	}
ds@1952	1402	free(zConverted);
ds@1952	1403	return (void*)h;
ds@1952	1404	}
ds@1952	1405	static void winDlError(sqlite3_vfs pVfs, int nBuf, char zBufOut){
ds@1952	1406	FormatMessage(
ds@1952	1407	FORMAT_MESSAGE_FROM_SYSTEM,
ds@1952	1408	NULL,
ds@1952	1409	GetLastError(),
ds@1952	1410	0,
ds@1952	1411	zBufOut,
ds@1952	1412	nBuf-1,
ds@1952	1413	0
ds@1952	1414	);
ds@1952	1415	}
ds@1952	1416	void winDlSym(sqlite3_vfs pVfs, void pHandle, const char zSymbol){
ds@1952	1417	#if OS_WINCE
ds@1952	1418	/* The GetProcAddressA() routine is only available on wince. */
ds@1952	1419	return GetProcAddressA((HANDLE)pHandle, zSymbol);
ds@1952	1420	#else
ds@1952	1421	/* All other windows platforms expect GetProcAddress() to take
ds@1952	1422	** an Ansi string regardless of the _UNICODE setting */
ds@1952	1423	return GetProcAddress((HANDLE)pHandle, zSymbol);
ds@1952	1424	#endif
ds@1952	1425	}
ds@1952	1426	void winDlClose(sqlite3_vfs pVfs, void pHandle){
ds@1952	1427	FreeLibrary((HANDLE)pHandle);
ds@1952	1428	}
ds@1952	1429	#else /* if SQLITE_OMIT_LOAD_EXTENSION is defined: */
ds@1952	1430	#define winDlOpen 0
ds@1952	1431	#define winDlError 0
ds@1952	1432	#define winDlSym 0
ds@1952	1433	#define winDlClose 0
ds@1952	1434	#endif
ds@1952	1435
ds@1952	1436
ds@1952	1437	/*
ds@1952	1438	** Write up to nBuf bytes of randomness into zBuf.
ds@1952	1439	*/
ds@1952	1440	static int winRandomness(sqlite3_vfs pVfs, int nBuf, char zBuf){
ds@1952	1441	int n = 0;
ds@1952	1442	if( sizeof(SYSTEMTIME)<=nBuf-n ){
ds@1952	1443	SYSTEMTIME x;
ds@1952	1444	GetSystemTime(&x);
ds@1952	1445	memcpy(&zBuf[n], &x, sizeof(x));
ds@1952	1446	n += sizeof(x);
ds@1952	1447	}
ds@1952	1448	if( sizeof(DWORD)<=nBuf-n ){
ds@1952	1449	DWORD pid = GetCurrentProcessId();
ds@1952	1450	memcpy(&zBuf[n], &pid, sizeof(pid));
ds@1952	1451	n += sizeof(pid);
ds@1952	1452	}
ds@1952	1453	if( sizeof(DWORD)<=nBuf-n ){
ds@1952	1454	DWORD cnt = GetTickCount();
ds@1952	1455	memcpy(&zBuf[n], &cnt, sizeof(cnt));
ds@1952	1456	n += sizeof(cnt);
ds@1952	1457	}
ds@1952	1458	if( sizeof(LARGE_INTEGER)<=nBuf-n ){
ds@1952	1459	LARGE_INTEGER i;
ds@1952	1460	QueryPerformanceCounter(&i);
ds@1952	1461	memcpy(&zBuf[n], &i, sizeof(i));
ds@1952	1462	n += sizeof(i);
ds@1952	1463	}
ds@1952	1464	return n;
ds@1952	1465	}
ds@1952	1466
ds@1952	1467
ds@1952	1468	/*
ds@1952	1469	** Sleep for a little while. Return the amount of time slept.
ds@1952	1470	*/
ds@1952	1471	static int winSleep(sqlite3_vfs *pVfs, int microsec){
ds@1952	1472	Sleep((microsec+999)/1000);
ds@1952	1473	return ((microsec+999)/1000)*1000;
ds@1952	1474	}
ds@1952	1475
ds@1952	1476	/*
ds@1952	1477	** The following variable, if set to a non-zero value, becomes the result
ds@1952	1478	** returned from sqlite3OsCurrentTime(). This is used for testing.
ds@1952	1479	*/
ds@1952	1480	#ifdef SQLITE_TEST
ds@1952	1481	int sqlite3_current_time = 0;
ds@1952	1482	#endif
ds@1952	1483
ds@1952	1484	/*
ds@1952	1485	** Find the current time (in Universal Coordinated Time). Write the
ds@1952	1486	** current time and date as a Julian Day number into *prNow and
ds@1952	1487	** return 0. Return 1 if the time and date cannot be found.
ds@1952	1488	*/
ds@1952	1489	int winCurrentTime(sqlite3_vfs pVfs, double prNow){
ds@1952	1490	FILETIME ft;
ds@1952	1491	/* FILETIME structure is a 64-bit value representing the number of
ds@1952	1492	100-nanosecond intervals since January 1, 1601 (= JD 2305813.5).
ds@1952	1493	*/
ds@1952	1494	double now;
ds@1952	1495	#if OS_WINCE
ds@1952	1496	SYSTEMTIME time;
ds@1952	1497	GetSystemTime(&time);
ds@1952	1498	SystemTimeToFileTime(&time,&ft);
ds@1952	1499	#else
ds@1952	1500	GetSystemTimeAsFileTime( &ft );
ds@1952	1501	#endif
ds@1952	1502	now = ((double)ft.dwHighDateTime) * 4294967296.0;
ds@1952	1503	*prNow = (now + ft.dwLowDateTime)/864000000000.0 + 2305813.5;
ds@1952	1504	#ifdef SQLITE_TEST
ds@1952	1505	if( sqlite3_current_time ){
ds@1952	1506	*prNow = sqlite3_current_time/86400.0 + 2440587.5;
ds@1952	1507	}
ds@1952	1508	#endif
ds@1952	1509	return 0;
ds@1952	1510	}
ds@1952	1511
ds@1952	1512
ds@1952	1513	/*
ds@1952	1514	** Return a pointer to the sqlite3DefaultVfs structure. We use
ds@1952	1515	** a function rather than give the structure global scope because
ds@1952	1516	** some compilers (MSVC) do not allow forward declarations of
ds@1952	1517	** initialized structures.
ds@1952	1518	*/
ds@1952	1519	sqlite3_vfs *sqlite3OsDefaultVfs(void){
ds@1952	1520	static sqlite3_vfs winVfs = {
ds@1952	1521	1, /* iVersion */
ds@1952	1522	sizeof(winFile), /* szOsFile */
ds@1952	1523	MAX_PATH, /* mxPathname */
ds@1952	1524	0, /* pNext */
ds@1952	1525	"win32", /* zName */
ds@1952	1526	0, /* pAppData */
ds@1952	1527
ds@1952	1528	winOpen, /* xOpen */
ds@1952	1529	winDelete, /* xDelete */
ds@1952	1530	winAccess, /* xAccess */
ds@1952	1531	winGetTempname, /* xGetTempName */
ds@1952	1532	winFullPathname, /* xFullPathname */
ds@1952	1533	winDlOpen, /* xDlOpen */
ds@1952	1534	winDlError, /* xDlError */
ds@1952	1535	winDlSym, /* xDlSym */
ds@1952	1536	winDlClose, /* xDlClose */
ds@1952	1537	winRandomness, /* xRandomness */
ds@1952	1538	winSleep, /* xSleep */
ds@1952	1539	winCurrentTime /* xCurrentTime */
ds@1952	1540	};
ds@1952	1541
ds@1952	1542	return &winVfs;
ds@1952	1543	}
ds@1952	1544
ds@1952	1545	#endif /* OS_WIN */

author	David Anderson <dvander@alliedmods.net>
	Sun Aug 30 01:54:45 2009 -0700 (2009-08-30)
changeset 2790	6dd851ba15fd
parent 1952	b7aa2b626807
permissions	-rw-r--r--