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Overview
Comment:Cut over the patches to support WinCE. Ticket #1600. (CVS 3003)
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 436287c2bfe38cf6c39e4c52b1da12f8c0d673ce
User & Date: drh 2006-01-23 15:54:26.000
Context
2006-01-23
15:59
Changes to the enc2.test script so that it will run on windows. (CVS 3004) (check-in: 4c1818eceb user: drh tags: trunk)
15:54
Cut over the patches to support WinCE. Ticket #1600. (CVS 3003) (check-in: 436287c2bf user: drh tags: trunk)
15:39
Fix a bug in pager.c that was overwriting freed memory. Comment changes in util.c. (CVS 3002) (check-in: 8c7e18c3f2 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/os_win.c.
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*/
#if defined(_WIN32_WCE)
# define OS_WINCE 1
#else
# define OS_WINCE 0
#endif














/*
** The winFile structure is a subclass of OsFile specific to the win32
** portability layer.
*/
typedef struct winFile winFile;
struct winFile {
  IoMethod const *pMethod;/* Must be first */
  HANDLE h;               /* Handle for accessing the file */
  unsigned char locktype; /* Type of lock currently held on this file */
  short sharedLockByte;   /* Randomly chosen byte used as a shared lock */
#if OS_WINCE
  WCHAR *zDeleteOnClose;   /* Name of file to delete when closing */




#endif
};


/*
** Do not include any of the File I/O interface procedures if the
** SQLITE_OMIT_DISKIO macro is defined (indicating that there database







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*/
#if defined(_WIN32_WCE)
# define OS_WINCE 1
#else
# define OS_WINCE 0
#endif

/*
** WinCE lacks native support for file locking so we have to fake it
** with some code of our own.
*/
#if OS_WINCE
typedef struct winceLock {
  int nReaders;       /* Number of reader locks obtained */
  BOOL bPending;      /* Indicates a pending lock has been obtained */
  BOOL bReserved;     /* Indicates a reserved lock has been obtained */
  BOOL bExclusive;    /* Indicates an exclusive lock has been obtained */
} winceLock;
#endif

/*
** The winFile structure is a subclass of OsFile specific to the win32
** portability layer.
*/
typedef struct winFile winFile;
struct winFile {
  IoMethod const *pMethod;/* Must be first */
  HANDLE h;               /* Handle for accessing the file */
  unsigned char locktype; /* Type of lock currently held on this file */
  short sharedLockByte;   /* Randomly chosen byte used as a shared lock */
#if OS_WINCE
  WCHAR *zDeleteOnClose;  /* Name of file to delete when closing */
  HANDLE hMutex;          /* Mutex used to control access to shared lock */  
  HANDLE hShared;         /* Shared memory segment used for locking */
  winceLock local;        /* Locks obtained by this instance of winFile */
  winceLock *shared;      /* Global shared lock memory for the file  */
#endif
};


/*
** Do not include any of the File I/O interface procedures if the
** SQLITE_OMIT_DISKIO macro is defined (indicating that there database
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      GetVersionEx(&sInfo);
      sqlite3_os_type = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
    }
    return sqlite3_os_type==2;
  }
#endif /* OS_WINCE */

#if OS_WINCE
/*
** WindowsCE does not have a localtime() function.  So create a
** substitute.
*/
#include <time.h>
struct tm *__cdecl localtime(const time_t *t)
{
  static struct tm y;
  FILETIME uTm, lTm;
  SYSTEMTIME pTm;
  i64 t64;
  t64 = *t;
  t64 = (t64 + 11644473600)*10000000;
  uTm.dwLowDateTime = t64 & 0xFFFFFFFF;
  uTm.dwHighDateTime= t64 >> 32;
  FileTimeToLocalFileTime(&uTm,&lTm);
  FileTimeToSystemTime(&lTm,&pTm);
  y.tm_year = pTm.wYear - 1900;
  y.tm_mon = pTm.wMonth - 1;
  y.tm_wday = pTm.wDayOfWeek;
  y.tm_mday = pTm.wDay;
  y.tm_hour = pTm.wHour;
  y.tm_min = pTm.wMinute;
  y.tm_sec = pTm.wSecond;
  return &y;
}
#endif

/*
** Compile with -DSQLITE_OMIT_WIN_LOCKS to disable file locking on
** windows.  If you do this and two or more connections attempt to
** write the database at the same time, the database file will be
** corrupted.  But some versions of WindowsCE do not support locking,
** in which case compiling with this option is required just to get
** it to work at all.
*/
#ifdef SQLITE_OMIT_WIN_LOCKS
# define LockFile(a,b,c,d,e) (1)
# define LockFileEx(a,b,c,d,e,f) (1)
# define UnlockFile(a,b,c,d,e) (1)
# define UnlockFileEx(a,b,c,d,e) (1)
#endif

/*
** Convert a UTF-8 string to UTF-32.  Space to hold the returned string
** is obtained from sqliteMalloc.
*/
static WCHAR *utf8ToUnicode(const char *zFilename){
  int nByte;
  WCHAR *zWideFilename;







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      GetVersionEx(&sInfo);
      sqlite3_os_type = sInfo.dwPlatformId==VER_PLATFORM_WIN32_NT ? 2 : 1;
    }
    return sqlite3_os_type==2;
  }
#endif /* OS_WINCE */













































/*
** Convert a UTF-8 string to UTF-32.  Space to hold the returned string
** is obtained from sqliteMalloc.
*/
static WCHAR *utf8ToUnicode(const char *zFilename){
  int nByte;
  WCHAR *zWideFilename;
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  if( nByte == 0 ){
    sqliteFree(zFilename);
    zFilename = 0;
  }
  return zFilename;
}



















































































































































































































































































































/*
** Delete the named file
*/
int sqlite3WinDelete(const char *zFilename){
  WCHAR *zWide = utf8ToUnicode(zFilename);
  if( zWide ){







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  if( nByte == 0 ){
    sqliteFree(zFilename);
    zFilename = 0;
  }
  return zFilename;
}

#if OS_WINCE
/*************************************************************************
** This section contains code for WinCE only.
*/
/*
** WindowsCE does not have a localtime() function.  So create a
** substitute.
*/
#include <time.h>
struct tm *__cdecl localtime(const time_t *t)
{
  static struct tm y;
  FILETIME uTm, lTm;
  SYSTEMTIME pTm;
  i64 t64;
  t64 = *t;
  t64 = (t64 + 11644473600)*10000000;
  uTm.dwLowDateTime = t64 & 0xFFFFFFFF;
  uTm.dwHighDateTime= t64 >> 32;
  FileTimeToLocalFileTime(&uTm,&lTm);
  FileTimeToSystemTime(&lTm,&pTm);
  y.tm_year = pTm.wYear - 1900;
  y.tm_mon = pTm.wMonth - 1;
  y.tm_wday = pTm.wDayOfWeek;
  y.tm_mday = pTm.wDay;
  y.tm_hour = pTm.wHour;
  y.tm_min = pTm.wMinute;
  y.tm_sec = pTm.wSecond;
  return &y;
}

/* This will never be called, but defined to make the code compile */
#define GetTempPathA(a,b)

#define LockFile(a,b,c,d,e)       winceLockFile(&a, b, c, d, e)
#define UnlockFile(a,b,c,d,e)     winceUnlockFile(&a, b, c, d, e)
#define LockFileEx(a,b,c,d,e,f)   winceLockFileEx(&a, b, c, d, e, f)

#define HANDLE_TO_WINFILE(a) (winFile*)&((char*)a)[-offsetof(winFile,h)]

/*
** Acquire a lock on the handle h
*/
static void winceMutexAcquire(HANDLE h){
   DWORD dwErr;
   do {
     dwErr = WaitForSingleObject(h, INFINITE);
   } while (dwErr != WAIT_OBJECT_0 && dwErr != WAIT_ABANDONED);
}
/*
** Release a lock acquired by winceMutexAcquire()
*/
#define winceMutexRelease(h) ReleaseMutex(h)

/*
** Create the mutex and shared memory used for locking in the file
** descriptor pFile
*/
static BOOL winceCreateLock(const char *zFilename, winFile *pFile){
  WCHAR *zTok;
  WCHAR *zName = utf8ToUnicode(zFilename);
  BOOL bInit = TRUE;

  /* Initialize the local lockdata */
  ZeroMemory(&pFile->local, sizeof(pFile->local));

  /* Replace the backslashes from the filename and lowercase it
  ** to derive a mutex name. */
  zTok = CharLowerW(zName);
  for (;*zTok;zTok++){
    if (*zTok == '\\') *zTok = '_';
  }

  /* Create/open the named mutex */
  pFile->hMutex = CreateMutexW(NULL, FALSE, zName);
  if (!pFile->hMutex){
    sqliteFree(zName);
    return FALSE;
  }

  /* Acquire the mutex before continuing */
  winceMutexAcquire(pFile->hMutex);
  
  /* Since the names of named mutexes, semaphores, file mappings etc are 
  ** case-sensitive, take advantage of that by uppercasing the mutex name
  ** and using that as the shared filemapping name.
  */
  CharUpperW(zName);
  pFile->hShared = CreateFileMappingW(INVALID_HANDLE_VALUE, NULL,
                                       PAGE_READWRITE, 0, sizeof(winceLock),
                                       zName);  

  /* Set a flag that indicates we're the first to create the memory so it 
  ** must be zero-initialized */
  if (GetLastError() == ERROR_ALREADY_EXISTS){
    bInit = FALSE;
  }

  sqliteFree(zName);

  /* If we succeeded in making the shared memory handle, map it. */
  if (pFile->hShared){
    pFile->shared = (winceLock*)MapViewOfFile(pFile->hShared, 
             FILE_MAP_READ|FILE_MAP_WRITE, 0, 0, sizeof(winceLock));
    /* If mapping failed, close the shared memory handle and erase it */
    if (!pFile->shared){
      CloseHandle(pFile->hShared);
      pFile->hShared = NULL;
    }
  }

  /* If shared memory could not be created, then close the mutex and fail */
  if (pFile->hShared == NULL){
    winceMutexRelease(pFile->hMutex);
    CloseHandle(pFile->hMutex);
    pFile->hMutex = NULL;
    return FALSE;
  }
  
  /* Initialize the shared memory if we're supposed to */
  if (bInit) {
    ZeroMemory(pFile->shared, sizeof(winceLock));
  }

  winceMutexRelease(pFile->hMutex);
  return TRUE;
}

/*
** Destroy the part of winFile that deals with wince locks
*/
static void winceDestroyLock(winFile *pFile){
  if (pFile->hMutex){
    /* Acquire the mutex */
    winceMutexAcquire(pFile->hMutex);

    /* The following blocks should probably assert in debug mode, but they
       are to cleanup in case any locks remained open */
    if (pFile->local.nReaders){
      pFile->shared->nReaders --;
    }
    if (pFile->local.bReserved){
      pFile->shared->bReserved = FALSE;
    }
    if (pFile->local.bPending){
      pFile->shared->bPending = FALSE;
    }
    if (pFile->local.bExclusive){
      pFile->shared->bExclusive = FALSE;
    }

    /* De-reference and close our copy of the shared memory handle */
    UnmapViewOfFile(pFile->shared);
    CloseHandle(pFile->hShared);

    /* Done with the mutex */
    winceMutexRelease(pFile->hMutex);    
    CloseHandle(pFile->hMutex);
    pFile->hMutex = NULL;
  }
}

/* 
** An implementation of the LockFile() API of windows for wince
*/
static BOOL winceLockFile(
  HANDLE *phFile,
  DWORD dwFileOffsetLow,
  DWORD dwFileOffsetHigh,
  DWORD nNumberOfBytesToLockLow,
  DWORD nNumberOfBytesToLockHigh
){
  winFile *pFile = HANDLE_TO_WINFILE(phFile);
  BOOL bReturn = FALSE;

  if (!pFile->hMutex) return TRUE;
  winceMutexAcquire(pFile->hMutex);

  /* Wanting an exclusive lock? */
  if (dwFileOffsetLow == SHARED_FIRST
       && nNumberOfBytesToLockLow == SHARED_SIZE){
    if (pFile->shared->nReaders == 0 && pFile->shared->bExclusive == 0){
       pFile->shared->bExclusive = TRUE;
       pFile->local.bExclusive = TRUE;
       bReturn = TRUE;
    }
  }

  /* Want a read-only lock? */
  else if ((dwFileOffsetLow >= SHARED_FIRST &&
            dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE) &&
            nNumberOfBytesToLockLow == 1){
    if (pFile->shared->bExclusive == 0){
      pFile->local.nReaders ++;
      if (pFile->local.nReaders == 1){
        pFile->shared->nReaders ++;
      }
      bReturn = TRUE;
    }
  }

  /* Want a pending lock? */
  else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToLockLow == 1){
    /* If no pending lock has been acquired, then acquire it */
    if (pFile->shared->bPending == 0) {
      pFile->shared->bPending = TRUE;
      pFile->local.bPending = TRUE;
      bReturn = TRUE;
    }
  }
  /* Want a reserved lock? */
  else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToLockLow == 1){
    if (pFile->shared->bReserved == 0) {
      pFile->shared->bReserved = TRUE;
      pFile->local.bReserved = TRUE;
      bReturn = TRUE;
    }
  }

  winceMutexRelease(pFile->hMutex);
  return bReturn;
}

/*
** An implementation of the UnlockFile API of windows for wince
*/
static BOOL winceUnlockFile(
  HANDLE *phFile,
  DWORD dwFileOffsetLow,
  DWORD dwFileOffsetHigh,
  DWORD nNumberOfBytesToUnlockLow,
  DWORD nNumberOfBytesToUnlockHigh
){
  winFile *pFile = HANDLE_TO_WINFILE(phFile);
  BOOL bReturn = FALSE;

  if (!pFile->hMutex) return TRUE;
  winceMutexAcquire(pFile->hMutex);

  /* Releasing a reader lock or an exclusive lock */
  if (dwFileOffsetLow >= SHARED_FIRST &&
       dwFileOffsetLow < SHARED_FIRST + SHARED_SIZE){
    /* Did we have an exclusive lock? */
    if (pFile->local.bExclusive){
      pFile->local.bExclusive = FALSE;
      pFile->shared->bExclusive = FALSE;
      bReturn = TRUE;
    }

    /* Did we just have a reader lock? */
    else if (pFile->local.nReaders){
      pFile->local.nReaders --;
      if (pFile->local.nReaders == 0)
      {
        pFile->shared->nReaders --;
      }
      bReturn = TRUE;
    }
  }

  /* Releasing a pending lock */
  else if (dwFileOffsetLow == PENDING_BYTE && nNumberOfBytesToUnlockLow == 1){
    if (pFile->local.bPending){
      pFile->local.bPending = FALSE;
      pFile->shared->bPending = FALSE;
      bReturn = TRUE;
    }
  }
  /* Releasing a reserved lock */
  else if (dwFileOffsetLow == RESERVED_BYTE && nNumberOfBytesToUnlockLow == 1){
    if (pFile->local.bReserved) {
      pFile->local.bReserved = FALSE;
      pFile->shared->bReserved = FALSE;
      bReturn = TRUE;
    }
  }

  winceMutexRelease(pFile->hMutex);
  return bReturn;
}

/*
** An implementation of the LockFileEx() API of windows for wince
*/
static BOOL winceLockFileEx(
  HANDLE *phFile,
  DWORD dwFlags,
  DWORD dwReserved,
  DWORD nNumberOfBytesToLockLow,
  DWORD nNumberOfBytesToLockHigh,
  LPOVERLAPPED lpOverlapped
){
  /* If the caller wants a shared read lock, forward this call
  ** to winceLockFile */
  if (lpOverlapped->Offset == SHARED_FIRST &&
      dwFlags == 1 &&
      nNumberOfBytesToLockLow == SHARED_SIZE){
    return winceLockFile(phFile, SHARED_FIRST, 0, 1, 0);
  }
  return FALSE;
}
/*
** End of the special code for wince
*****************************************************************************/
#endif /* OS_WINCE */

/*
** Delete the named file
*/
int sqlite3WinDelete(const char *zFilename){
  WCHAR *zWide = utf8ToUnicode(zFilename);
  if( zWide ){
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        sqliteFree(zWide);
        return SQLITE_CANTOPEN;
      }
      *pReadonly = 1;
    }else{
      *pReadonly = 0;
    }







    sqliteFree(zWide);
  }else{
#if OS_WINCE
    return SQLITE_NOMEM;
#else
    h = CreateFileA(zFilename,
       GENERIC_READ | GENERIC_WRITE,







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        sqliteFree(zWide);
        return SQLITE_CANTOPEN;
      }
      *pReadonly = 1;
    }else{
      *pReadonly = 0;
    }
#if OS_WINCE
    if (!winceCreateLock(zFilename, &f)){
      CloseHandle(h);
      sqliteFree(zWide);
      return SQLITE_CANTOPEN;
    }
#endif
    sqliteFree(zWide);
  }else{
#if OS_WINCE
    return SQLITE_NOMEM;
#else
    h = CreateFileA(zFilename,
       GENERIC_READ | GENERIC_WRITE,
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    return SQLITE_CANTOPEN;
  }
  f.h = h;
  f.locktype = NO_LOCK;
  f.sharedLockByte = 0;
#if OS_WINCE
  f.zDeleteOnClose = delFlag ? utf8ToUnicode(zFilename) : 0;

#endif
  TRACE3("OPEN EX %d \"%s\"\n", h, zFilename);
  return allocateWinFile(&f, pId);
}

/*
** Attempt to open a new file for read-only access.







>







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    return SQLITE_CANTOPEN;
  }
  f.h = h;
  f.locktype = NO_LOCK;
  f.sharedLockByte = 0;
#if OS_WINCE
  f.zDeleteOnClose = delFlag ? utf8ToUnicode(zFilename) : 0;
  f.hMutex = NULL;
#endif
  TRACE3("OPEN EX %d \"%s\"\n", h, zFilename);
  return allocateWinFile(&f, pId);
}

/*
** Attempt to open a new file for read-only access.
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    return SQLITE_CANTOPEN;
  }
  f.h = h;
  f.locktype = NO_LOCK;
  f.sharedLockByte = 0;
#if OS_WINCE
  f.zDeleteOnClose = 0;

#endif
  TRACE3("OPEN RO %d \"%s\"\n", h, zFilename);
  return allocateWinFile(&f, pId);
}

/*
** Attempt to open a file descriptor for the directory that contains a







>







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    return SQLITE_CANTOPEN;
  }
  f.h = h;
  f.locktype = NO_LOCK;
  f.sharedLockByte = 0;
#if OS_WINCE
  f.zDeleteOnClose = 0;
  f.hMutex = NULL;
#endif
  TRACE3("OPEN RO %d \"%s\"\n", h, zFilename);
  return allocateWinFile(&f, pId);
}

/*
** Attempt to open a file descriptor for the directory that contains a
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*/
static int winClose(OsFile **pId){
  winFile *pFile;
  if( pId && (pFile = (winFile*)*pId)!=0 ){
    TRACE2("CLOSE %d\n", pFile->h);
    CloseHandle(pFile->h);
#if OS_WINCE

    if( pFile->zDeleteOnClose ){
      DeleteFileW(pFile->zDeleteOnClose);
      sqliteFree(pFile->zDeleteOnClose);
    }
#endif
    OpenCounter(-1);
    sqliteFree(pFile);







>







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*/
static int winClose(OsFile **pId){
  winFile *pFile;
  if( pId && (pFile = (winFile*)*pId)!=0 ){
    TRACE2("CLOSE %d\n", pFile->h);
    CloseHandle(pFile->h);
#if OS_WINCE
    winceDestroyLock(pFile);
    if( pFile->zDeleteOnClose ){
      DeleteFileW(pFile->zDeleteOnClose);
      sqliteFree(pFile->zDeleteOnClose);
    }
#endif
    OpenCounter(-1);
    sqliteFree(pFile);