/*
 * Copyright (c) 2001, Robert Collins.
 *
 *     This program is free software; you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation; either version 2 of the License, or
 *     (at your option) any later version.
 *
 *     A copy of the GNU General Public License can be found at
 *     http://www.gnu.org/
 *
 * Written by Robert Collins  <rbtcollins@hotmail.com>
 *
 */

#if 0
static const char *cvsid =
  "\n%%% $Id: source.cc,v 2.5 2001/11/01 13:22:46 rbcollins Exp $\n";
#endif

#include "win32.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "log.h"
#include "port.h"
#include "mklink2.h"

#include "io_stream.h"
#include "io_stream_file.h"

/* for set_mtime */
#define FACTOR (0x19db1ded53ea710LL)
#define NSPERSEC 10000000LL

io_stream_file::io_stream_file (const char *name, const char *mode)
{
  fname = NULL;
  fp = NULL;
  errno = 0;
  if (!name || IsBadStringPtr (name, MAX_PATH) || !name[0] ||
      !mode || IsBadStringPtr (mode, 5) || !mode[0])
    return;
  fname = strdup (name);
  fp = fopen (name, mode);
  if (!fp)
    lasterr = errno;
}

io_stream_file::~io_stream_file ()
{
  if (fname)
    free (fname);
  if (fp)
    fclose (fp);
}

int
io_stream_file::exists (const char *path)
{
  if (_access (path, 0) == 0)
    return 1;
  return 0;
}

int
io_stream_file::remove (const char *path)
{
  if (!path)
    return 1;

  unsigned long w = GetFileAttributes (path);
  if (w != 0xffffffff && w & FILE_ATTRIBUTE_DIRECTORY)
    {
      char *tmp = (char *) malloc (strlen (path) + 10);
      int i = 0;
      do
	{
	  i++;
	  sprintf (tmp, "%s.old-%d", path, i);
	}
      while (GetFileAttributes (tmp) != 0xffffffff);
      fprintf (stderr, "warning: moving directory \"%s\" out of the way.\n",
	       path);
      MoveFile (path, tmp);
      free (tmp);
    }
  return !DeleteFileA (path);

}

int
io_stream_file::mklink (const char *from, const char *to,
			io_stream_link_t linktype)
{
  /* FIXME: badstring check */
  if (!from || !to)
    return 1;
  switch (linktype)
    {
    case IO_STREAM_SYMLINK:
      return mkcygsymlink (from, to);
    case IO_STREAM_HARDLINK:
      return 1;
    }
  return 1;
}

/* virtuals */


ssize_t io_stream_file::read (void *buffer, size_t len)
{
  if (fp)
    return fread (buffer, 1, len, fp);
  return 0;
}

ssize_t io_stream_file::write (void *buffer, size_t len)
{
  if (fp)
    return fwrite (buffer, 1, len, fp);
  return 0;
}

ssize_t io_stream_file::peek (void *buffer, size_t len)
{
  log (LOG_TIMESTAMP, "io_stream_file::peek called");
  if (fp)
    {
      int
	pos = ftell (fp);
      ssize_t
	rv = fread (buffer, 1, len, fp);
      fseek (fp, pos, SEEK_SET);
      return rv;
    }
  return 0;
}

long
io_stream_file::tell ()
{
  if (fp)
    {
      return ftell (fp);
    }
  return 0;
}

int
io_stream_file::error ()
{
  if (fp)
    return ferror (fp);
  return lasterr;
}

int
io_stream_file::set_mtime (int mtime)
{
  if (!fname)
    return 1;
  long long ftimev = mtime * NSPERSEC + FACTOR;
  FILETIME ftime;
  ftime.dwHighDateTime = ftimev >> 32;
  ftime.dwLowDateTime = ftimev;
  HANDLE h =
    CreateFileA (fname, GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
		 0, OPEN_EXISTING,
		 FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, 0);
  if (h)
    {
      SetFileTime (h, 0, 0, &ftime);
      CloseHandle (h);
      return 0;
    }
  return 1;
}