goo/gfile.h

//========================================================================
//
// gfile.h
//
// Miscellaneous file and directory name manipulation.
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2006 Kristian Høgsberg <krh@redhat.com>
// Copyright (C) 2009, 2011, 2012, 2017, 2018 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Kovid Goyal <kovid@kovidgoyal.net>
// Copyright (C) 2013 Adam Reichold <adamreichold@myopera.com>
// Copyright (C) 2013, 2017 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2014 Bogdan Cristea <cristeab@gmail.com>
// Copyright (C) 2014 Peter Breitenlohner <peb@mppmu.mpg.de>
// Copyright (C) 2017 Christoph Cullmann <cullmann@kde.org>
// Copyright (C) 2017 Thomas Freitag <Thomas.Freitag@alfa.de>
// Copyright (C) 2018 Mojca Miklavec <mojca@macports.org>
// Copyright (C) 2019 Christian Persch <chpe@src.gnome.org>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================

#ifndef GFILE_H
#define GFILE_H

#include "poppler-config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <time.h>
extern "C" {
#if defined(_WIN32)
#  include <sys/stat.h>
#  ifdef FPTEX
#    include <win32lib.h>
#  else
#    ifndef NOMINMAX
#      define NOMINMAX
#    endif
#    include <windows.h>
#  endif
#else
#  include <unistd.h>
#  include <sys/types.h>
#  if defined(HAVE_DIRENT_H)
#    include <dirent.h>
#    define NAMLEN(d) strlen((d)->d_name)
#  else
#    define dirent direct
#    define NAMLEN(d) (d)->d_namlen
#    ifdef HAVE_SYS_NDIR_H
#      include <sys/ndir.h>
#    endif
#    ifdef HAVE_SYS_DIR_H
#      include <sys/dir.h>
#    endif
#    ifdef HAVE_NDIR_H
#      include <ndir.h>
#    endif
#  endif
#endif
}

class GooString;

/* Integer type for all file offsets and file sizes */
typedef long long Goffset;

//------------------------------------------------------------------------

// Append a file name to a path string.  <path> may be an empty
// string, denoting the current directory).  Returns <path>.
extern GooString *appendToPath(GooString *path, const char *fileName);

#ifndef _WIN32
// Open a file descriptor
// Could be implemented on WIN32 too, but the only external caller of
// this function is not used on WIN32
extern int openFileDescriptor(const char *path, int flags);
#endif

// Open a file.  On Windows, this converts the path from UTF-8 to
// UCS-2 and calls _wfopen (if available).  On other OSes, this simply
// calls fopen.
extern FILE *openFile(const char *path, const char *mode);

// Just like fgets, but handles Unix, Mac, and/or DOS end-of-line
// conventions.
extern char *getLine(char *buf, int size, FILE *f);

// Like fseek/ftell but uses platform specific variants that support large files
extern int Gfseek(FILE *f, Goffset offset, int whence);
extern Goffset Gftell(FILE *f);

// Largest offset supported by Gfseek/Gftell
extern Goffset GoffsetMax();

//------------------------------------------------------------------------
// GooFile
//------------------------------------------------------------------------

class GooFile
{
public:
  GooFile(const GooFile &) = delete;
  GooFile& operator=(const GooFile &other) = delete;

  int read(char *buf, int n, Goffset offset) const;
  Goffset size() const;
  
  static GooFile *open(const GooString *fileName);
  
#ifdef _WIN32
  static GooFile *open(const wchar_t *fileName);
  
  ~GooFile() { CloseHandle(handle); }

  // Asuming than on windows you can't change files that are already open
  bool modificationTimeChangedSinceOpen() const;
  
private:
  GooFile(HANDLE handleA);
  HANDLE handle;
  struct _FILETIME modifiedTimeOnOpen;
#else
  ~GooFile() { close(fd); }

  bool modificationTimeChangedSinceOpen() const;
    
private:
  GooFile(int fdA);
  int fd;
  struct timespec modifiedTimeOnOpen;
#endif // _WIN32
};

#endif