SQLite

  HANDLE hMap;                    /* File handle for mapping */
  void *pMap;                     /* Pointer to mapping of file fd */
  size_t nMap;                    /* Size of mapping at pMap in bytes */
  int nShm;                       /* Number of entries in array apShm[] */
  void **apShm;                   /* Array of 32K shared memory segments */
};



static char *win32ShmFile(Win32File *p){
  char *zShm;
  int nName = strlen(p->zName);
  zShm = (char *)lsmMallocZero(p->pEnv, nName+4+1);
  if( zShm ){
    memcpy(zShm, p->zName, nName);
    memcpy(&zShm[nName], "-shm", 5);
  }
  return zShm;
}

static int win32Sleep(int us){
  Sleep((us + 999) / 1000);
  return LSM_OK;
}

/*
** The number of times that an I/O operation will be retried following a
** locking error - probably caused by antivirus software.  Also the initial
** delay before the first retry.  The delay increases linearly with each
** retry.
*/

){
  DWORD lastErrno;
  if( *pnRetry>=win32IoerrRetry ){
    return 0;
  }
  lastErrno = GetLastError();
  if( win32IoerrCanRetry1(lastErrno) ){
    win32Sleep(win32IoerrRetryDelay*(1+*pnRetry));
    ++*pnRetry;
    return 1;
  }
#if defined(win32IoerrCanRetry2)
  else if( win32IoerrCanRetry2(lastErrno) ){
    win32Sleep(win32IoerrRetryDelay*(1+*pnRetry));
    ++*pnRetry;
    return 1;
  }
#endif
  return 0;
}

  nChar = MultiByteToWideChar(CP_UTF8, 0, zText, -1, zWideText, nChar);
  if( nChar==0 ){
    lsmFree(pEnv, zWideText);
    zWideText = 0;
  }
  return zWideText;
}

/*
** Convert a Microsoft Unicode string to UTF-8.
**
** Space to hold the returned string is obtained from lsmMalloc().
*/
static char *win32UnicodeToUtf8(lsm_env *pEnv, LPCWSTR zWideText){
  int nByte;
  char *zText;

  nByte = WideCharToMultiByte(CP_UTF8, 0, zWideText, -1, 0, 0, 0, 0);
  if( nByte == 0 ){
    return 0;
  }
  zText = lsmMallocZero(pEnv, nByte);
  if( zText==0 ){
    return 0;
  }
  nByte = WideCharToMultiByte(CP_UTF8, 0, zWideText, -1, zText, nByte, 0, 0);
  if( nByte == 0 ){
    lsmFree(pEnv, zText);
    zText = 0;
  }
  return zText;
}

#if !defined(win32IsNotFound)
#define win32IsNotFound(a) (((a)==ERROR_FILE_NOT_FOUND)  || \
                            ((a)==ERROR_PATH_NOT_FOUND))
#endif

static int lsmWin32OsOpen(
  lsm_env *pEnv,
  const char *zFile,
  int flags,
  lsm_file **ppFile
){
  int rc = LSM_OK;
  Win32File *pWin32File;

  pWin32File = lsmMallocZero(pEnv, sizeof(Win32File));
  if( pWin32File==0 ){
    rc = LSM_NOMEM_BKPT;
  }else{
    LPWSTR zConverted;
    int bReadonly = (flags & LSM_OPEN_READONLY);
    DWORD dwDesiredAccess;
    DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
    DWORD dwCreationDisposition;
    DWORD dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
    HANDLE hFile;

  lsm_file *pFile,
  lsm_i64 iMin,
  void **ppOut,
  lsm_i64 *pnOut
){
  return LSM_ERROR;
}

static BOOL win32IsDriveLetterAndColon(
  const char *zPathname
){
  return ( isalpha(zPathname[0]) && zPathname[1]==':' );
}

static int lsmWin32OsFullpath(
  lsm_env *pEnv,
  const char *zName,
  char *zOut,
  int *pnOut
){
  DWORD nByte;
  void *zConverted;
  LPWSTR zTempWide;
  char *zTempUtf8;

  if( zName[0]=='/' && win32IsDriveLetterAndColon(zName+1) ){
    zName++;
  }
  zConverted = win32Utf8ToUnicode(pEnv, zName);
  if( zConverted==0 ){
    return LSM_NOMEM_BKPT;
  }
  nByte = GetFullPathNameW((LPCWSTR)zConverted, 0, 0, 0);
  if( nByte==0 ){
    lsmFree(pEnv, zConverted);
    return LSM_IOERR_BKPT;
  }
  nByte += 3;
  zTempWide = lsmMallocZero(pEnv, nByte * sizeof(zTempWide[0]));
  if( zTempWide==0 ){
    lsmFree(pEnv, zConverted);
    return LSM_NOMEM_BKPT;
  }
  nByte = GetFullPathNameW((LPCWSTR)zConverted, nByte, zTempWide, 0);
  if( nByte==0 ){
    lsmFree(pEnv, zConverted);
    lsmFree(pEnv, zTempWide);
    return LSM_IOERR_BKPT;
  }
  lsmFree(pEnv, zConverted);
  zTempUtf8 = win32UnicodeToUtf8(pEnv, zTempWide);
  lsmFree(pEnv, zTempWide);
  if( zTempUtf8 ){
    int nOut = *pnOut;
    int nLen = strlen(zTempUtf8) + 1;
    if( nLen>=nOut ){
      lsmFree(pEnv, zTempUtf8);
      return LSM_IOERR_BKPT;
    }
    snprintf(zOut, nOut, "%s", zTempUtf8);
    lsmFree(pEnv, zTempUtf8);
    *pnOut = nLen;
    return LSM_OK;
  }else{
    return LSM_NOMEM_BKPT;
  }
}

static int lsmWin32OsFileid(
  lsm_file *pFile,
  void *pBuf,
  int *pnBuf
){

  lsmFree(pWin32File->pEnv, pWin32File->apShm);
  lsmFree(pWin32File->pEnv, pWin32File);
  return rc;
}

static int lsmWin32OsSleep(lsm_env *pEnv, int us){
  unused_parameter(pEnv);

  return win32Sleep(us);
}

/****************************************************************************
** Memory allocation routines.
*/

static void *lsmWin32OsMalloc(lsm_env *pEnv, size_t N){