/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Windows 95 IO module
 *
 * Assumes synchronous I/O.
 *
 */

#include "primpl.h"
#include <direct.h>
#include <mbstring.h>
#ifdef MOZ_UNICODE
#  include <wchar.h>
#endif /* MOZ_UNICODE */

struct _MDLock _pr_ioq_lock;

/*
 * NSPR-to-NT access right mapping table for files.
 */
static DWORD fileAccessTable[] = {FILE_GENERIC_READ, FILE_GENERIC_WRITE,
                                  FILE_GENERIC_EXECUTE};

/*
 * NSPR-to-NT access right mapping table for directories.
 */
static DWORD dirAccessTable[] = {FILE_GENERIC_READ,
                                 FILE_GENERIC_WRITE | FILE_DELETE_CHILD,
                                 FILE_GENERIC_EXECUTE};

static PRBool IsPrevCharSlash(const char* str, const char* current);

void _PR_MD_INIT_IO() {
  WORD WSAVersion = 0x0101;
  WSADATA WSAData;
  int err;

  err = WSAStartup(WSAVersion, &WSAData);
  PR_ASSERT(0 == err);

#ifdef DEBUG
  /* Doublecheck _pr_filetime_offset's hard-coded value is correct. */
  {
    SYSTEMTIME systime;
    union {
      PRTime prt;
      FILETIME ft;
    } filetime;
    BOOL rv;

    systime.wYear = 1970;
    systime.wMonth = 1;
    /* wDayOfWeek is ignored */
    systime.wDay = 1;
    systime.wHour = 0;
    systime.wMinute = 0;
    systime.wSecond = 0;
    systime.wMilliseconds = 0;

    rv = SystemTimeToFileTime(&systime, &filetime.ft);
    PR_ASSERT(0 != rv);
    PR_ASSERT(filetime.prt == _pr_filetime_offset);
  }
#endif /* DEBUG */

  _PR_NT_InitSids();

  _PR_MD_InitSockets();
}

PRStatus _PR_MD_WAIT(PRThread* thread, PRIntervalTime ticks) {
  DWORD rv;

  PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT)
                       ? INFINITE
                       : PR_IntervalToMilliseconds(ticks);
  rv = WaitForSingleObject(thread->md.blocked_sema, msecs);
  switch (rv) {
    case WAIT_OBJECT_0:
      return PR_SUCCESS;
    case WAIT_TIMEOUT:
      _PR_THREAD_LOCK(thread);
      if (thread->state == _PR_IO_WAIT) {
        ;
      } else {
        if (thread->wait.cvar != NULL) {
          thread->wait.cvar = NULL;
          _PR_THREAD_UNLOCK(thread);
        } else {
          /* The CVAR was notified just as the timeout
           * occurred.  This led to us being notified twice.
           * call WaitForSingleObject() to clear the semaphore.
           */
          _PR_THREAD_UNLOCK(thread);
          rv = WaitForSingleObject(thread->md.blocked_sema, 0);
          PR_ASSERT(rv == WAIT_OBJECT_0);
        }
      }
      return PR_SUCCESS;
    default:
      return PR_FAILURE;
  }
}
PRStatus _PR_MD_WAKEUP_WAITER(PRThread* thread) {
  if (_PR_IS_NATIVE_THREAD(thread)) {
    if (ReleaseSemaphore(thread->md.blocked_sema, 1, NULL) == FALSE) {
      return PR_FAILURE;
    } else {
      return PR_SUCCESS;
    }
  }
}

/* --- FILE IO ----------------------------------------------------------- */
/*
 *  _PR_MD_OPEN() -- Open a file
 *
 *  returns: a fileHandle
 *
 *  The NSPR open flags (osflags) are translated into flags for Win95
 *
 *  Mode seems to be passed in as a unix style file permissions argument
 *  as in 0666, in the case of opening the logFile.
 *
 */
PROsfd _PR_MD_OPEN(const char* name, PRIntn osflags, int mode) {
  HANDLE file;
  PRInt32 access = 0;
  PRInt32 flags = 0;
  PRInt32 flag6 = 0;

  if (osflags & PR_SYNC) {
    flag6 = FILE_FLAG_WRITE_THROUGH;
  }

  if (osflags & PR_RDONLY || osflags & PR_RDWR) {
    access |= GENERIC_READ;
  }
  if (osflags & PR_WRONLY || osflags & PR_RDWR) {
    access |= GENERIC_WRITE;
  }

  if (osflags & PR_CREATE_FILE && osflags & PR_EXCL) {
    flags = CREATE_NEW;
  } else if (osflags & PR_CREATE_FILE) {
    if (osflags & PR_TRUNCATE) {
      flags = CREATE_ALWAYS;
    } else {
      flags = OPEN_ALWAYS;
    }
  } else {
    if (osflags & PR_TRUNCATE) {
      flags = TRUNCATE_EXISTING;
    } else {
      flags = OPEN_EXISTING;
    }
  }

  file = CreateFileA(name, access, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                     flags, flag6, NULL);
  if (file == INVALID_HANDLE_VALUE) {
    _PR_MD_MAP_OPEN_ERROR(GetLastError());
    return -1;
  }

  return (PROsfd)file;
}

PROsfd _PR_MD_OPEN_FILE(const char* name, PRIntn osflags, int mode) {
  HANDLE file;
  PRInt32 access = 0;
  PRInt32 flags = 0;
  PRInt32 flag6 = 0;
  SECURITY_ATTRIBUTES sa;
  LPSECURITY_ATTRIBUTES lpSA = NULL;
  PSECURITY_DESCRIPTOR pSD = NULL;
  PACL pACL = NULL;

  if (osflags & PR_CREATE_FILE) {
    if (_PR_NT_MakeSecurityDescriptorACL(mode, fileAccessTable, &pSD, &pACL) ==
        PR_SUCCESS) {
      sa.nLength = sizeof(sa);
      sa.lpSecurityDescriptor = pSD;
      sa.bInheritHandle = FALSE;
      lpSA = &sa;
    }
  }

  if (osflags & PR_SYNC) {
    flag6 = FILE_FLAG_WRITE_THROUGH;
  }

  if (osflags & PR_RDONLY || osflags & PR_RDWR) {
    access |= GENERIC_READ;
  }
  if (osflags & PR_WRONLY || osflags & PR_RDWR) {
    access |= GENERIC_WRITE;
  }

  if (osflags & PR_CREATE_FILE && osflags & PR_EXCL) {
    flags = CREATE_NEW;
  } else if (osflags & PR_CREATE_FILE) {
    if (osflags & PR_TRUNCATE) {
      flags = CREATE_ALWAYS;
    } else {
      flags = OPEN_ALWAYS;
    }
  } else {
    if (osflags & PR_TRUNCATE) {
      flags = TRUNCATE_EXISTING;
    } else {
      flags = OPEN_EXISTING;
    }
  }

  file = CreateFileA(name, access, FILE_SHARE_READ | FILE_SHARE_WRITE, lpSA,
                     flags, flag6, NULL);
  if (lpSA != NULL) {
    _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
  }
  if (file == INVALID_HANDLE_VALUE) {
    _PR_MD_MAP_OPEN_ERROR(GetLastError());
    return -1;
  }

  return (PROsfd)file;
}

PRInt32 _PR_MD_READ(PRFileDesc* fd, void* buf, PRInt32 len) {
  PRUint32 bytes;
  int rv, err;

  rv = ReadFile((HANDLE)fd->secret->md.osfd, (LPVOID)buf, len, &bytes, NULL);

  if (rv == 0) {
    err = GetLastError();
    /* ERROR_HANDLE_EOF can only be returned by async io */
    PR_ASSERT(err != ERROR_HANDLE_EOF);
    if (err == ERROR_BROKEN_PIPE) {
      return 0;
    } else {
      _PR_MD_MAP_READ_ERROR(err);
      return -1;
    }
  }
  return bytes;
}

PRInt32 _PR_MD_WRITE(PRFileDesc* fd, const void* buf, PRInt32 len) {
  PROsfd f = fd->secret->md.osfd;
  PRInt32 bytes;
  int rv;

  rv = WriteFile((HANDLE)f, buf, len, &bytes, NULL);

  if (rv == 0) {
    _PR_MD_MAP_WRITE_ERROR(GetLastError());
    return -1;
  }
  return bytes;
} /* --- end _PR_MD_WRITE() --- */

PROffset32 _PR_MD_LSEEK(PRFileDesc* fd, PROffset32 offset,
                        PRSeekWhence whence) {
  DWORD moveMethod;
  PROffset32 rv;

  switch (whence) {
    case PR_SEEK_SET:
      moveMethod = FILE_BEGIN;
      break;
    case PR_SEEK_CUR:
      moveMethod = FILE_CURRENT;
      break;
    case PR_SEEK_END:
      moveMethod = FILE_END;
      break;
    default:
      PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
      return -1;
  }

  rv = SetFilePointer((HANDLE)fd->secret->md.osfd, offset, NULL, moveMethod);

  /*
   * If the lpDistanceToMoveHigh argument (third argument) is
   * NULL, SetFilePointer returns 0xffffffff on failure.
   */
  if (-1 == rv) {
    _PR_MD_MAP_LSEEK_ERROR(GetLastError());
  }
  return rv;
}

PROffset64 _PR_MD_LSEEK64(PRFileDesc* fd, PROffset64 offset,
                          PRSeekWhence whence) {
  DWORD moveMethod;
  LARGE_INTEGER li;
  DWORD err;

  switch (whence) {
    case PR_SEEK_SET:
      moveMethod = FILE_BEGIN;
      break;
    case PR_SEEK_CUR:
      moveMethod = FILE_CURRENT;
      break;
    case PR_SEEK_END:
      moveMethod = FILE_END;
      break;
    default:
      PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
      return -1;
  }

  li.QuadPart = offset;
  li.LowPart = SetFilePointer((HANDLE)fd->secret->md.osfd, li.LowPart,
                              &li.HighPart, moveMethod);

  if (0xffffffff == li.LowPart && (err = GetLastError()) != NO_ERROR) {
    _PR_MD_MAP_LSEEK_ERROR(err);
    li.QuadPart = -1;
  }
  return li.QuadPart;
}

/*
 * This is documented to succeed on read-only files, but Win32's
 * FlushFileBuffers functions fails with "access denied" in such a
 * case.  So we only signal an error if the error is *not* "access
 * denied".
 */
PRInt32 _PR_MD_FSYNC(PRFileDesc* fd) {
  /*
   * From the documentation:
   *
   *     On Windows NT, the function FlushFileBuffers fails if hFile
   *     is a handle to console output. That is because console
   *     output is not buffered. The function returns FALSE, and
   *     GetLastError returns ERROR_INVALID_HANDLE.
   *
   * On the other hand, on Win95, it returns without error.  I cannot
   * assume that 0, 1, and 2 are console, because if someone closes
   * System.out and then opens a file, they might get file descriptor
   * 1.  An error on *that* version of 1 should be reported, whereas
   * an error on System.out (which was the original 1) should be
   * ignored.  So I use isatty() to ensure that such an error was due
   * to this bogosity, and if it was, I ignore the error.
   */

  BOOL ok = FlushFileBuffers((HANDLE)fd->secret->md.osfd);

  if (!ok) {
    DWORD err = GetLastError();
    if (err != ERROR_ACCESS_DENIED) {  // from winerror.h
      _PR_MD_MAP_FSYNC_ERROR(err);
      return -1;
    }
  }
  return 0;
}

PRInt32 _MD_CloseFile(PROsfd osfd) {
  PRInt32 rv;

  rv = (CloseHandle((HANDLE)osfd)) ? 0 : -1;
  if (rv == -1) {
    _PR_MD_MAP_CLOSE_ERROR(GetLastError());
  }
  return rv;
}

/* --- DIR IO ------------------------------------------------------------ */
#define GetFileFromDIR(d) (d)->d_entry.cFileName
#define FileIsHidden(d) ((d)->d_entry.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN)

static void FlipSlashes(char* cp, size_t len) {
  while (len-- > 0) {
    if (cp[0] == '/') {
      cp[0] = PR_DIRECTORY_SEPARATOR;
    }
    cp = _mbsinc(cp);
  }
} /* end FlipSlashes() */

/*
**
** Local implementations of standard Unix RTL functions which are not provided
** by the VC RTL.
**
*/

PRInt32 _PR_MD_CLOSE_DIR(_MDDir* d) {
  if (d) {
    if (FindClose(d->d_hdl)) {
      d->magic = (PRUint32)-1;
      return 0;
    } else {
      _PR_MD_MAP_CLOSEDIR_ERROR(GetLastError());
      return -1;
    }
  }
  PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
  return -1;
}

PRStatus _PR_MD_OPEN_DIR(_MDDir* d, const char* name) {
  char filename[MAX_PATH];
  size_t len;

  len = strlen(name);
  /* Need 5 bytes for \*.* and the trailing null byte. */
  if (len + 5 > MAX_PATH) {
    PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
    return PR_FAILURE;
  }
  strcpy(filename, name);

  /*
   * If 'name' ends in a slash or backslash, do not append
   * another backslash.
   */
  if (IsPrevCharSlash(filename, filename + len)) {
    len--;
  }
  strcpy(&filename[len], "\\*.*");
  FlipSlashes(filename, strlen(filename));

  d->d_hdl = FindFirstFileA(filename, &(d->d_entry));
  if (d->d_hdl == INVALID_HANDLE_VALUE) {
    _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
    return PR_FAILURE;
  }
  d->firstEntry = PR_TRUE;
  d->magic = _MD_MAGIC_DIR;
  return PR_SUCCESS;
}

char* _PR_MD_READ_DIR(_MDDir* d, PRIntn flags) {
  PRInt32 err;
  BOOL rv;
  char* fileName;

  if (d) {
    while (1) {
      if (d->firstEntry) {
        d->firstEntry = PR_FALSE;
        rv = 1;
      } else {
        rv = FindNextFileA(d->d_hdl, &(d->d_entry));
      }
      if (rv == 0) {
        break;
      }
      fileName = GetFileFromDIR(d);
      if ((flags & PR_SKIP_DOT) && (fileName[0] == '.') &&
          (fileName[1] == '\0')) {
        continue;
      }
      if ((flags & PR_SKIP_DOT_DOT) && (fileName[0] == '.') &&
          (fileName[1] == '.') && (fileName[2] == '\0')) {
        continue;
      }
      if ((flags & PR_SKIP_HIDDEN) && FileIsHidden(d)) {
        continue;
      }
      return fileName;
    }
    err = GetLastError();
    PR_ASSERT(NO_ERROR != err);
    _PR_MD_MAP_READDIR_ERROR(err);
    return NULL;
  }
  PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
  return NULL;
}

PRInt32 _PR_MD_DELETE(const char* name) {
  if (DeleteFileA(name)) {
    return 0;
  } else {
    _PR_MD_MAP_DELETE_ERROR(GetLastError());
    return -1;
  }
}

void _PR_FileTimeToPRTime(const FILETIME* filetime, PRTime* prtm) {
  PR_ASSERT(sizeof(FILETIME) == sizeof(PRTime));
  CopyMemory(prtm, filetime, sizeof(PRTime));
#if defined(__MINGW32__)
  *prtm = (*prtm - _pr_filetime_offset) / 10LL;
#else
  *prtm = (*prtm - _pr_filetime_offset) / 10i64;
#endif

#ifdef DEBUG
  /* Doublecheck our calculation. */
  {
    SYSTEMTIME systime;
    PRExplodedTime etm;
    PRTime cmp; /* for comparison */
    BOOL rv;

    rv = FileTimeToSystemTime(filetime, &systime);
    PR_ASSERT(0 != rv);

    /*
     * PR_ImplodeTime ignores wday and yday.
     */
    etm.tm_usec = systime.wMilliseconds * PR_USEC_PER_MSEC;
    etm.tm_sec = systime.wSecond;
    etm.tm_min = systime.wMinute;
    etm.tm_hour = systime.wHour;
    etm.tm_mday = systime.wDay;
    etm.tm_month = systime.wMonth - 1;
    etm.tm_year = systime.wYear;
    /*
     * It is not well-documented what time zone the FILETIME's
     * are in.  WIN32_FIND_DATA is documented to be in UTC (GMT).
     * But BY_HANDLE_FILE_INFORMATION is unclear about this.
     * By our best judgement, we assume that FILETIME is in UTC.
     */
    etm.tm_params.tp_gmt_offset = 0;
    etm.tm_params.tp_dst_offset = 0;
    cmp = PR_ImplodeTime(&etm);

    /*
     * SYSTEMTIME is in milliseconds precision, so we convert PRTime's
     * microseconds to milliseconds before doing the comparison.
     */
    PR_ASSERT((cmp / PR_USEC_PER_MSEC) == (*prtm / PR_USEC_PER_MSEC));
  }
#endif /* DEBUG */
}

PRInt32 _PR_MD_STAT(const char* fn, struct stat* info) {
  PRInt32 rv;

  rv = _stat(fn, (struct _stat*)info);
  if (-1 == rv) {
    /*
     * Check for MSVC runtime library _stat() bug.
     * (It's really a bug in FindFirstFile().)
     * If a pathname ends in a backslash or slash,
     * e.g., c:\temp\ or c:/temp/, _stat() will fail.
     * Note: a pathname ending in a slash (e.g., c:/temp/)
     * can be handled by _stat() on NT but not on Win95.
     *
     * We remove the backslash or slash at the end and
     * try again.
     */

    size_t len = strlen(fn);
    if (len > 0 && len <= _MAX_PATH && IsPrevCharSlash(fn, fn + len)) {
      char newfn[_MAX_PATH + 1];

      strcpy(newfn, fn);
      newfn[len - 1] = '\0';
      rv = _stat(newfn, (struct _stat*)info);
    }
  }

  if (-1 == rv) {
    _PR_MD_MAP_STAT_ERROR(errno);
  }
  return rv;
}

#define _PR_IS_SLASH(ch) ((ch) == '/' || (ch) == '\\')

static PRBool IsPrevCharSlash(const char* str, const char* current) {
  const char* prev;

  if (str >= current) {
    return PR_FALSE;
  }
  prev = _mbsdec(str, current);
  return (prev == current - 1) && _PR_IS_SLASH(*prev);
}

/*
 * IsRootDirectory --
 *
 * Return PR_TRUE if the pathname 'fn' is a valid root directory,
 * else return PR_FALSE.  The char buffer pointed to by 'fn' must
 * be writable.  During the execution of this function, the contents
 * of the buffer pointed to by 'fn' may be modified, but on return
 * the original contents will be restored.  'buflen' is the size of
 * the buffer pointed to by 'fn'.
 *
 * Root directories come in three formats:
 * 1. / or \, meaning the root directory of the current drive.
 * 2. C:/ or C:\, where C is a drive letter.
 * 3. \\<server name>\<share point name>\ or
 *    \\<server name>\<share point name>, meaning the root directory
 *    of a UNC (Universal Naming Convention) name.
 */

static PRBool IsRootDirectory(char* fn, size_t buflen) {
  char* p;
  PRBool slashAdded = PR_FALSE;
  PRBool rv = PR_FALSE;

  if (_PR_IS_SLASH(fn[0]) && fn[1] == '\0') {
    return PR_TRUE;
  }

  if (isalpha((unsigned char)fn[0]) && fn[1] == ':' && _PR_IS_SLASH(fn[2]) && fn[3] == '\0') {
    rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
    return rv;
  }

  /* The UNC root directory */

  if (_PR_IS_SLASH(fn[0]) && _PR_IS_SLASH(fn[1])) {
    /* The 'server' part should have at least one character. */
    p = &fn[2];
    if (*p == '\0' || _PR_IS_SLASH(*p)) {
      return PR_FALSE;
    }

    /* look for the next slash */
    do {
      p = _mbsinc(p);
    } while (*p != '\0' && !_PR_IS_SLASH(*p));
    if (*p == '\0') {
      return PR_FALSE;
    }

    /* The 'share' part should have at least one character. */
    p++;
    if (*p == '\0' || _PR_IS_SLASH(*p)) {
      return PR_FALSE;
    }

    /* look for the final slash */
    do {
      p = _mbsinc(p);
    } while (*p != '\0' && !_PR_IS_SLASH(*p));
    if (_PR_IS_SLASH(*p) && p[1] != '\0') {
      return PR_FALSE;
    }
    if (*p == '\0') {
      /*
       * GetDriveType() doesn't work correctly if the
       * path is of the form \\server\share, so we add
       * a final slash temporarily.
       */
      if ((p + 1) < (fn + buflen)) {
        *p++ = '\\';
        *p = '\0';
        slashAdded = PR_TRUE;
      } else {
        return PR_FALSE; /* name too long */
      }
    }
    rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
    /* restore the 'fn' buffer */
    if (slashAdded) {
      *--p = '\0';
    }
  }
  return rv;
}

PRInt32 _PR_MD_GETFILEINFO64(const char* fn, PRFileInfo64* info) {
  WIN32_FILE_ATTRIBUTE_DATA findFileData;
  BOOL rv;

  if (NULL == fn || '\0' == *fn) {
    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
    return -1;
  }

  rv = GetFileAttributesEx(fn, GetFileExInfoStandard, &findFileData);
  if (!rv) {
    _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
    return -1;
  }

  if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
    info->type = PR_FILE_DIRECTORY;
  } else {
    info->type = PR_FILE_FILE;
  }

  info->size = findFileData.nFileSizeHigh;
  info->size = (info->size << 32) + findFileData.nFileSizeLow;

  _PR_FileTimeToPRTime(&findFileData.ftLastWriteTime, &info->modifyTime);

  if (0 == findFileData.ftCreationTime.dwLowDateTime &&
      0 == findFileData.ftCreationTime.dwHighDateTime) {
    info->creationTime = info->modifyTime;
  } else {
    _PR_FileTimeToPRTime(&findFileData.ftCreationTime, &info->creationTime);
  }

  return 0;
}

PRInt32 _PR_MD_GETFILEINFO(const char* fn, PRFileInfo* info) {
  PRFileInfo64 info64;
  PRInt32 rv = _PR_MD_GETFILEINFO64(fn, &info64);
  if (0 == rv) {
    info->type = info64.type;
    info->size = (PRUint32)info64.size;
    info->modifyTime = info64.modifyTime;
    info->creationTime = info64.creationTime;
  }
  return rv;
}

PRInt32 _PR_MD_GETOPENFILEINFO64(const PRFileDesc* fd, PRFileInfo64* info) {
  int rv;

  BY_HANDLE_FILE_INFORMATION hinfo;

  rv = GetFileInformationByHandle((HANDLE)fd->secret->md.osfd, &hinfo);
  if (rv == FALSE) {
    _PR_MD_MAP_FSTAT_ERROR(GetLastError());
    return -1;
  }

  if (hinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
    info->type = PR_FILE_DIRECTORY;
  } else {
    info->type = PR_FILE_FILE;
  }

  info->size = hinfo.nFileSizeHigh;
  info->size = (info->size << 32) + hinfo.nFileSizeLow;

  _PR_FileTimeToPRTime(&hinfo.ftLastWriteTime, &(info->modifyTime));
  _PR_FileTimeToPRTime(&hinfo.ftCreationTime, &(info->creationTime));

  return 0;
}

PRInt32 _PR_MD_GETOPENFILEINFO(const PRFileDesc* fd, PRFileInfo* info) {
  PRFileInfo64 info64;
  int rv = _PR_MD_GETOPENFILEINFO64(fd, &info64);
  if (0 == rv) {
    info->type = info64.type;
    info->modifyTime = info64.modifyTime;
    info->creationTime = info64.creationTime;
    LL_L2I(info->size, info64.size);
  }
  return rv;
}

PRStatus _PR_MD_SET_FD_INHERITABLE(PRFileDesc* fd, PRBool inheritable) {
  BOOL rv;

  /*
   * The SetHandleInformation function fails with the
   * ERROR_CALL_NOT_IMPLEMENTED error on Win95.
   */
  rv = SetHandleInformation((HANDLE)fd->secret->md.osfd, HANDLE_FLAG_INHERIT,
                            inheritable ? HANDLE_FLAG_INHERIT : 0);
  if (0 == rv) {
    _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
    return PR_FAILURE;
  }
  return PR_SUCCESS;
}

void _PR_MD_INIT_FD_INHERITABLE(PRFileDesc* fd, PRBool imported) {
  if (imported) {
    fd->secret->inheritable = _PR_TRI_UNKNOWN;
  } else {
    fd->secret->inheritable = _PR_TRI_FALSE;
  }
}

void _PR_MD_QUERY_FD_INHERITABLE(PRFileDesc* fd) {
  DWORD flags;

  PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
  if (GetHandleInformation((HANDLE)fd->secret->md.osfd, &flags)) {
    if (flags & HANDLE_FLAG_INHERIT) {
      fd->secret->inheritable = _PR_TRI_TRUE;
    } else {
      fd->secret->inheritable = _PR_TRI_FALSE;
    }
  }
}

PRInt32 _PR_MD_RENAME(const char* from, const char* to) {
  /* Does this work with dot-relative pathnames? */
  if (MoveFileA(from, to)) {
    return 0;
  } else {
    _PR_MD_MAP_RENAME_ERROR(GetLastError());
    return -1;
  }
}

PRInt32 _PR_MD_ACCESS(const char* name, PRAccessHow how) {
  PRInt32 rv;
  switch (how) {
    case PR_ACCESS_WRITE_OK:
      rv = _access(name, 02);
      break;
    case PR_ACCESS_READ_OK:
      rv = _access(name, 04);
      break;
    case PR_ACCESS_EXISTS:
      return _access(name, 00);
      break;
    default:
      PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
      return -1;
  }
  if (rv < 0) {
    _PR_MD_MAP_ACCESS_ERROR(errno);
  }
  return rv;
}

PRInt32 _PR_MD_MKDIR(const char* name, PRIntn mode) {
  /* XXXMB - how to translate the "mode"??? */
  if (CreateDirectoryA(name, NULL)) {
    return 0;
  } else {
    _PR_MD_MAP_MKDIR_ERROR(GetLastError());
    return -1;
  }
}

PRInt32 _PR_MD_MAKE_DIR(const char* name, PRIntn mode) {
  BOOL rv;
  SECURITY_ATTRIBUTES sa;
  LPSECURITY_ATTRIBUTES lpSA = NULL;
  PSECURITY_DESCRIPTOR pSD = NULL;
  PACL pACL = NULL;

  if (_PR_NT_MakeSecurityDescriptorACL(mode, dirAccessTable, &pSD, &pACL) ==
      PR_SUCCESS) {
    sa.nLength = sizeof(sa);
    sa.lpSecurityDescriptor = pSD;
    sa.bInheritHandle = FALSE;
    lpSA = &sa;
  }
  rv = CreateDirectoryA(name, lpSA);
  if (lpSA != NULL) {
    _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
  }
  if (rv) {
    return 0;
  } else {
    _PR_MD_MAP_MKDIR_ERROR(GetLastError());
    return -1;
  }
}

PRInt32 _PR_MD_RMDIR(const char* name) {
  if (RemoveDirectoryA(name)) {
    return 0;
  } else {
    _PR_MD_MAP_RMDIR_ERROR(GetLastError());
    return -1;
  }
}

PRStatus _PR_MD_LOCKFILE(PROsfd f) {
  PRStatus rc = PR_SUCCESS;
  DWORD rv;

  rv = LockFile((HANDLE)f, 0l, 0l, 0x0l, 0xffffffffl);
  if (rv == 0) {
    DWORD err = GetLastError();
    _PR_MD_MAP_DEFAULT_ERROR(err);
    PR_LOG(_pr_io_lm, PR_LOG_ERROR,
           ("_PR_MD_LOCKFILE() failed. Error: %d", err));
    rc = PR_FAILURE;
  }

  return rc;
} /* end _PR_MD_LOCKFILE() */

PRStatus _PR_MD_TLOCKFILE(PROsfd f) {
  PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  return PR_FAILURE;
} /* end _PR_MD_TLOCKFILE() */

PRStatus _PR_MD_UNLOCKFILE(PROsfd f) {
  PRInt32 rv;

  rv = UnlockFile((HANDLE)f, 0l, 0l, 0x0l, 0xffffffffl);

  if (rv) {
    return PR_SUCCESS;
  } else {
    _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
    return PR_FAILURE;
  }
} /* end _PR_MD_UNLOCKFILE() */

PRInt32 _PR_MD_PIPEAVAILABLE(PRFileDesc* fd) {
  if (NULL == fd) {
    PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
  } else {
    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  }
  return -1;
}

#ifdef MOZ_UNICODE

typedef HANDLE(WINAPI* CreateFileWFn)(LPCWSTR, DWORD, DWORD,
                                      LPSECURITY_ATTRIBUTES, DWORD, DWORD,
                                      HANDLE);
static CreateFileWFn createFileW = CreateFileW;
typedef HANDLE(WINAPI* FindFirstFileWFn)(LPCWSTR, LPWIN32_FIND_DATAW);
static FindFirstFileWFn findFirstFileW = FindFirstFileW;
typedef BOOL(WINAPI* FindNextFileWFn)(HANDLE, LPWIN32_FIND_DATAW);
static FindNextFileWFn findNextFileW = FindNextFileW;
typedef DWORD(WINAPI* GetFullPathNameWFn)(LPCWSTR, DWORD, LPWSTR, LPWSTR*);
static GetFullPathNameWFn getFullPathNameW = GetFullPathNameW;
typedef UINT(WINAPI* GetDriveTypeWFn)(LPCWSTR);
static GetDriveTypeWFn getDriveTypeW = GetDriveTypeW;

#endif /* MOZ_UNICODE */

#ifdef MOZ_UNICODE

/* ================ UTF16 Interfaces ================================ */
static void FlipSlashesW(PRUnichar* cp, size_t len) {
  while (len-- > 0) {
    if (cp[0] == L'/') {
      cp[0] = L'\\';
    }
    cp++;
  }
} /* end FlipSlashesW() */

PROsfd _PR_MD_OPEN_FILE_UTF16(const PRUnichar* name, PRIntn osflags, int mode) {
  HANDLE file;
  PRInt32 access = 0;
  PRInt32 flags = 0;
  PRInt32 flag6 = 0;
  SECURITY_ATTRIBUTES sa;
  LPSECURITY_ATTRIBUTES lpSA = NULL;
  PSECURITY_DESCRIPTOR pSD = NULL;
  PACL pACL = NULL;

  if (osflags & PR_CREATE_FILE) {
    if (_PR_NT_MakeSecurityDescriptorACL(mode, fileAccessTable, &pSD, &pACL) ==
        PR_SUCCESS) {
      sa.nLength = sizeof(sa);
      sa.lpSecurityDescriptor = pSD;
      sa.bInheritHandle = FALSE;
      lpSA = &sa;
    }
  }

  if (osflags & PR_SYNC) {
    flag6 = FILE_FLAG_WRITE_THROUGH;
  }

  if (osflags & PR_RDONLY || osflags & PR_RDWR) {
    access |= GENERIC_READ;
  }
  if (osflags & PR_WRONLY || osflags & PR_RDWR) {
    access |= GENERIC_WRITE;
  }

  if (osflags & PR_CREATE_FILE && osflags & PR_EXCL) {
    flags = CREATE_NEW;
  } else if (osflags & PR_CREATE_FILE) {
    if (osflags & PR_TRUNCATE) {
      flags = CREATE_ALWAYS;
    } else {
      flags = OPEN_ALWAYS;
    }
  } else {
    if (osflags & PR_TRUNCATE) {
      flags = TRUNCATE_EXISTING;
    } else {
      flags = OPEN_EXISTING;
    }
  }

  file = createFileW(name, access, FILE_SHARE_READ | FILE_SHARE_WRITE, lpSA,
                     flags, flag6, NULL);
  if (lpSA != NULL) {
    _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
  }
  if (file == INVALID_HANDLE_VALUE) {
    _PR_MD_MAP_OPEN_ERROR(GetLastError());
    return -1;
  }

  return (PROsfd)file;
}

PRStatus _PR_MD_OPEN_DIR_UTF16(_MDDirUTF16* d, const PRUnichar* name) {
  PRUnichar filename[MAX_PATH];
  int len;

  len = wcslen(name);
  /* Need 5 bytes for \*.* and the trailing null byte. */
  if (len + 5 > MAX_PATH) {
    PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
    return PR_FAILURE;
  }
  wcscpy(filename, name);

  /*
   * If 'name' ends in a slash or backslash, do not append
   * another backslash.
   */
  if (filename[len - 1] == L'/' || filename[len - 1] == L'\\') {
    len--;
  }
  wcscpy(&filename[len], L"\\*.*");
  FlipSlashesW(filename, wcslen(filename));

  d->d_hdl = findFirstFileW(filename, &(d->d_entry));
  if (d->d_hdl == INVALID_HANDLE_VALUE) {
    _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
    return PR_FAILURE;
  }
  d->firstEntry = PR_TRUE;
  d->magic = _MD_MAGIC_DIR;
  return PR_SUCCESS;
}

PRUnichar* _PR_MD_READ_DIR_UTF16(_MDDirUTF16* d, PRIntn flags) {
  PRInt32 err;
  BOOL rv;
  PRUnichar* fileName;

  if (d) {
    while (1) {
      if (d->firstEntry) {
        d->firstEntry = PR_FALSE;
        rv = 1;
      } else {
        rv = findNextFileW(d->d_hdl, &(d->d_entry));
      }
      if (rv == 0) {
        break;
      }
      fileName = GetFileFromDIR(d);
      if ((flags & PR_SKIP_DOT) && (fileName[0] == L'.') &&
          (fileName[1] == L'\0')) {
        continue;
      }
      if ((flags & PR_SKIP_DOT_DOT) && (fileName[0] == L'.') &&
          (fileName[1] == L'.') && (fileName[2] == L'\0')) {
        continue;
      }
      if ((flags & PR_SKIP_HIDDEN) && FileIsHidden(d)) {
        continue;
      }
      return fileName;
    }
    err = GetLastError();
    PR_ASSERT(NO_ERROR != err);
    _PR_MD_MAP_READDIR_ERROR(err);
    return NULL;
  }
  PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
  return NULL;
}

PRInt32 _PR_MD_CLOSE_DIR_UTF16(_MDDirUTF16* d) {
  if (d) {
    if (FindClose(d->d_hdl)) {
      d->magic = (PRUint32)-1;
      return 0;
    } else {
      _PR_MD_MAP_CLOSEDIR_ERROR(GetLastError());
      return -1;
    }
  }
  PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
  return -1;
}

#  define _PR_IS_W_SLASH(ch) ((ch) == L'/' || (ch) == L'\\')

/*
 * IsRootDirectoryW --
 *
 * Return PR_TRUE if the pathname 'fn' is a valid root directory,
 * else return PR_FALSE.  The PRUnichar buffer pointed to by 'fn' must
 * be writable.  During the execution of this function, the contents
 * of the buffer pointed to by 'fn' may be modified, but on return
 * the original contents will be restored.  'buflen' is the size of
 * the buffer pointed to by 'fn', in PRUnichars.
 *
 * Root directories come in three formats:
 * 1. / or \, meaning the root directory of the current drive.
 * 2. C:/ or C:\, where C is a drive letter.
 * 3. \\<server name>\<share point name>\ or
 *    \\<server name>\<share point name>, meaning the root directory
 *    of a UNC (Universal Naming Convention) name.
 */

static PRBool IsRootDirectoryW(PRUnichar* fn, size_t buflen) {
  PRUnichar* p;
  PRBool slashAdded = PR_FALSE;
  PRBool rv = PR_FALSE;

  if (_PR_IS_W_SLASH(fn[0]) && fn[1] == L'\0') {
    return PR_TRUE;
  }

  if (iswalpha(fn[0]) && fn[1] == L':' && _PR_IS_W_SLASH(fn[2]) &&
      fn[3] == L'\0') {
    rv = getDriveTypeW(fn) > 1 ? PR_TRUE : PR_FALSE;
    return rv;
  }

  /* The UNC root directory */

  if (_PR_IS_W_SLASH(fn[0]) && _PR_IS_W_SLASH(fn[1])) {
    /* The 'server' part should have at least one character. */
    p = &fn[2];
    if (*p == L'\0' || _PR_IS_W_SLASH(*p)) {
      return PR_FALSE;
    }

    /* look for the next slash */
    do {
      p++;
    } while (*p != L'\0' && !_PR_IS_W_SLASH(*p));
    if (*p == L'\0') {
      return PR_FALSE;
    }

    /* The 'share' part should have at least one character. */
    p++;
    if (*p == L'\0' || _PR_IS_W_SLASH(*p)) {
      return PR_FALSE;
    }

    /* look for the final slash */
    do {
      p++;
    } while (*p != L'\0' && !_PR_IS_W_SLASH(*p));
    if (_PR_IS_W_SLASH(*p) && p[1] != L'\0') {
      return PR_FALSE;
    }
    if (*p == L'\0') {
      /*
       * GetDriveType() doesn't work correctly if the
       * path is of the form \\server\share, so we add
       * a final slash temporarily.
       */
      if ((p + 1) < (fn + buflen)) {
        *p++ = L'\\';
        *p = L'\0';
        slashAdded = PR_TRUE;
      } else {
        return PR_FALSE; /* name too long */
      }
    }
    rv = getDriveTypeW(fn) > 1 ? PR_TRUE : PR_FALSE;
    /* restore the 'fn' buffer */
    if (slashAdded) {
      *--p = L'\0';
    }
  }
  return rv;
}

PRInt32 _PR_MD_GETFILEINFO64_UTF16(const PRUnichar* fn, PRFileInfo64* info) {
  HANDLE hFindFile;
  WIN32_FIND_DATAW findFileData;
  PRUnichar pathbuf[MAX_PATH + 1];

  if (NULL == fn || L'\0' == *fn) {
    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
    return -1;
  }

  /*
   * FindFirstFile() expands wildcard characters.  So
   * we make sure the pathname contains no wildcard.
   */
  if (NULL != wcspbrk(fn, L"?*")) {
    PR_SetError(PR_FILE_NOT_FOUND_ERROR, 0);
    return -1;
  }

  hFindFile = findFirstFileW(fn, &findFileData);
  if (INVALID_HANDLE_VALUE == hFindFile) {
    DWORD len;
    PRUnichar* filePart;

    /*
     * FindFirstFile() does not work correctly on root directories.
     * It also doesn't work correctly on a pathname that ends in a
     * slash.  So we first check to see if the pathname specifies a
     * root directory.  If not, and if the pathname ends in a slash,
     * we remove the final slash and try again.
     */

    /*
     * If the pathname does not contain ., \, and /, it cannot be
     * a root directory or a pathname that ends in a slash.
     */
    if (NULL == wcspbrk(fn, L".\\/")) {
      _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
      return -1;
    }
    len = getFullPathNameW(fn, sizeof(pathbuf) / sizeof(pathbuf[0]), pathbuf,
                           &filePart);
    if (0 == len) {
      _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
      return -1;
    }
    if (len > sizeof(pathbuf) / sizeof(pathbuf[0])) {
      PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
      return -1;
    }
    if (IsRootDirectoryW(pathbuf, sizeof(pathbuf) / sizeof(pathbuf[0]))) {
      info->type = PR_FILE_DIRECTORY;
      info->size = 0;
      /*
       * These timestamps don't make sense for root directories.
       */
      info->modifyTime = 0;
      info->creationTime = 0;
      return 0;
    }
    if (!_PR_IS_W_SLASH(pathbuf[len - 1])) {
      _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
      return -1;
    } else {
      pathbuf[len - 1] = L'\0';
      hFindFile = findFirstFileW(pathbuf, &findFileData);
      if (INVALID_HANDLE_VALUE == hFindFile) {
        _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
        return -1;
      }
    }
  }

  FindClose(hFindFile);

  if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
    info->type = PR_FILE_DIRECTORY;
  } else {
    info->type = PR_FILE_FILE;
  }

  info->size = findFileData.nFileSizeHigh;
  info->size = (info->size << 32) + findFileData.nFileSizeLow;

  _PR_FileTimeToPRTime(&findFileData.ftLastWriteTime, &info->modifyTime);

  if (0 == findFileData.ftCreationTime.dwLowDateTime &&
      0 == findFileData.ftCreationTime.dwHighDateTime) {
    info->creationTime = info->modifyTime;
  } else {
    _PR_FileTimeToPRTime(&findFileData.ftCreationTime, &info->creationTime);
  }

  return 0;
}
/* ================ end of UTF16 Interfaces ================================ */
#endif /* MOZ_UNICODE */
