/**
 * \file physfs.h
 *
 * Main header file for PhysicsFS.
 */

/**
 * \mainpage PhysicsFS
 *
 * The latest version of PhysicsFS can be found at:
 *     http://icculus.org/physfs/
 *
 * PhysicsFS; a portable, flexible file i/o abstraction.
 *
 * This API gives you access to a system file system in ways superior to the
 *  stdio or system i/o calls. The brief benefits:
 *
 *   - It's portable.
 *   - It's safe. No file access is permitted outside the specified dirs.
 *   - It's flexible. Archives (.ZIP files) can be used transparently as
 *      directory structures.
 *
 * This system is largely inspired by Quake 3's PK3 files and the related
 *  fs_* cvars. If you've ever tinkered with these, then this API will be
 *  familiar to you.
 *
 * With PhysicsFS, you have a single writing directory and multiple
 *  directories (the "search path") for reading. You can think of this as a
 *  filesystem within a filesystem. If (on Windows) you were to set the
 *  writing directory to "C:\MyGame\MyWritingDirectory", then no PHYSFS calls
 *  could touch anything above this directory, including the "C:\MyGame" and
 *  "C:\" directories. This prevents an application's internal scripting
 *  language from piddling over c:\\config.sys, for example. If you'd rather
 *  give PHYSFS full access to the system's REAL file system, set the writing
 *  dir to "C:\", but that's generally A Bad Thing for several reasons.
 *
 * Drive letters are hidden in PhysicsFS once you set up your initial paths.
 *  The search path creates a single, hierarchical directory structure.
 *  Not only does this lend itself well to general abstraction with archives,
 *  it also gives better support to operating systems like MacOS and Unix.
 *  Generally speaking, you shouldn't ever hardcode a drive letter; not only
 *  does this hurt portability to non-Microsoft OSes, but it limits your win32
 *  users to a single drive, too. Use the PhysicsFS abstraction functions and
 *  allow user-defined configuration options, too. When opening a file, you
 *  specify it like it was on a Unix filesystem: if you want to write to
 *  "C:\MyGame\MyConfigFiles\game.cfg", then you might set the write dir to
 *  "C:\MyGame" and then open "MyConfigFiles/game.cfg". This gives an
 *  abstraction across all platforms. Specifying a file in this way is termed
 *  "platform-independent notation" in this documentation. Specifying a
 *  a filename in a form such as "C:\mydir\myfile" or
 *  "MacOS hard drive:My Directory:My File" is termed "platform-dependent
 *  notation". The only time you use platform-dependent notation is when
 *  setting up your write directory and search path; after that, all file
 *  access into those directories are done with platform-independent notation.
 *
 * All files opened for writing are opened in relation to the write directory,
 *  which is the root of the writable filesystem. When opening a file for
 *  reading, PhysicsFS goes through the search path. This is NOT the
 *  same thing as the PATH environment variable. An application using
 *  PhysicsFS specifies directories to be searched which may be actual
 *  directories, or archive files that contain files and subdirectories of
 *  their own. See the end of these docs for currently supported archive
 *  formats.
 *
 * Once the search path is defined, you may open files for reading. If you've
 *  got the following search path defined (to use a win32 example again):
 *
 *  - C:\\mygame
 *  - C:\\mygame\\myuserfiles
 *  - D:\\mygamescdromdatafiles
 *  - C:\\mygame\\installeddatafiles.zip
 *
 * Then a call to PHYSFS_openRead("textfiles/myfile.txt") (note the directory
 *  separator, lack of drive letter, and lack of dir separator at the start of
 *  the string; this is platform-independent notation) will check for
 *  C:\\mygame\\textfiles\\myfile.txt, then
 *  C:\\mygame\\myuserfiles\\textfiles\\myfile.txt, then
 *  D:\\mygamescdromdatafiles\\textfiles\\myfile.txt, then, finally, for
 *  textfiles\\myfile.txt inside of C:\\mygame\\installeddatafiles.zip.
 *  Remember that most archive types and platform filesystems store their
 *  filenames in a case-sensitive manner, so you should be careful to specify
 *  it correctly.
 *
 * Files opened through PhysicsFS may NOT contain "." or ".." or ":" as dir
 *  elements. Not only are these meaningless on MacOS Classic and/or Unix,
 *  they are a security hole. Also, symbolic links (which can be found in
 *  some archive types and directly in the filesystem on Unix platforms) are
 *  NOT followed until you call PHYSFS_permitSymbolicLinks(). That's left to
 *  your own discretion, as following a symlink can allow for access outside
 *  the write dir and search paths. For portability, there is no mechanism for
 *  creating new symlinks in PhysicsFS.
 *
 * The write dir is not included in the search path unless you specifically
 *  add it. While you CAN change the write dir as many times as you like,
 *  you should probably set it once and stick to it. Remember that your
 *  program will not have permission to write in every directory on Unix and
 *  NT systems.
 *
 * All files are opened in binary mode; there is no endline conversion for
 *  textfiles. Other than that, PhysicsFS has some convenience functions for
 *  platform-independence. There is a function to tell you the current
 *  platform's dir separator ("\\" on windows, "/" on Unix, ":" on MacOS),
 *  which is needed only to set up your search/write paths. There is a
 *  function to tell you what CD-ROM drives contain accessible discs, and a
 *  function to recommend a good search path, etc.
 *
 * A recommended order for the search path is the write dir, then the base dir,
 *  then the cdrom dir, then any archives discovered. Quake 3 does something
 *  like this, but moves the archives to the start of the search path. Build
 *  Engine games, like Duke Nukem 3D and Blood, place the archives last, and
 *  use the base dir for both searching and writing. There is a helper
 *  function (PHYSFS_setSaneConfig()) that puts together a basic configuration
 *  for you, based on a few parameters. Also see the comments on
 *  PHYSFS_getBaseDir(), and PHYSFS_getUserDir() for info on what those
 *  are and how they can help you determine an optimal search path.
 *
 * PhysicsFS 2.0 adds the concept of "mounting" archives to arbitrary points
 *  in the search path. If a zipfile contains "maps/level.map" and you mount
 *  that archive at "mods/mymod", then you would have to open
 *  "mods/mymod/maps/level.map" to access the file, even though "mods/mymod"
 *  isn't actually specified in the .zip file. Unlike the Unix mentality of
 *  mounting a filesystem, "mods/mymod" doesn't actually have to exist when
 *  mounting the zipfile. It's a "virtual" directory. The mounting mechanism
 *  allows the developer to seperate archives in the tree and avoid trampling
 *  over files when added new archives, such as including mod support in a
 *  game...keeping external content on a tight leash in this manner can be of
 *  utmost importance to some applications.
 *
 * PhysicsFS is mostly thread safe. The error messages returned by
 *  PHYSFS_getLastError are unique by thread, and library-state-setting
 *  functions are mutex'd. For efficiency, individual file accesses are 
 *  not locked, so you can not safely read/write/seek/close/etc the same 
 *  file from two threads at the same time. Other race conditions are bugs 
 *  that should be reported/patched.
 *
 * While you CAN use stdio/syscall file access in a program that has PHYSFS_*
 *  calls, doing so is not recommended, and you can not use system
 *  filehandles with PhysicsFS and vice versa.
 *
 * Note that archives need not be named as such: if you have a ZIP file and
 *  rename it with a .PKG extension, the file will still be recognized as a
 *  ZIP archive by PhysicsFS; the file's contents are used to determine its
 *  type where possible.
 *
 * Currently supported archive types:
 *   - .ZIP (pkZip/WinZip/Info-ZIP compatible)
 *   - .GRP (Build Engine groupfile archives)
 *   - .PAK (Quake I/II archive format)
 *   - .HOG (Descent I/II HOG file archives)
 *   - .MVL (Descent II movielib archives)
 *   - .WAD (DOOM engine archives)
 *
 *
 * String policy for PhysicsFS 2.0 and later:
 *
 * PhysicsFS 1.0 could only deal with null-terminated ASCII strings. All high
 *  ASCII chars resulted in undefined behaviour, and there was no Unicode
 *  support at all. PhysicsFS 2.0 supports Unicode without breaking binary
 *  compatibility with the 1.0 API by using UTF-8 encoding of all strings
 *  passed in and out of the library.
 *
 * All strings passed through PhysicsFS are in null-terminated UTF-8 format.
 *  This means that if all you care about is English (ASCII characters <= 127)
 *  then you just use regular C strings. If you care about Unicode (and you
 *  should!) then you need to figure out what your platform wants, needs, and
 *  offers. If you are on Windows and build with Unicode support, your TCHAR
 *  strings are two bytes per character (this is called "UCS-2 encoding"). You
 *  should convert them to UTF-8 before handing them to PhysicsFS with
 *  PHYSFS_utf8FromUcs2(). If you're using Unix or Mac OS X, your wchar_t
 *  strings are four bytes per character ("UCS-4 encoding"). Use
 *  PHYSFS_utf8FromUcs4(). Mac OS X can give you UTF-8 directly from a
 *  CFString, and many Unixes generally give you C strings in UTF-8 format
 *  everywhere. If you have a single-byte high ASCII charset, like so-many
 *  European "codepages" you may be out of luck. We'll convert from "Latin1"
 *  to UTF-8 only, and never back to Latin1. If you're above ASCII 127, all
 *  bets are off: move to Unicode or use your platform's facilities. Passing a
 *  C string with high-ASCII data that isn't UTF-8 encoded will NOT do what
 *  you expect!
 *
 * Naturally, there's also PHYSFS_utf8ToUcs2() and PHYSFS_utf8ToUcs4() to get
 *  data back into a format you like. Behind the scenes, PhysicsFS will use
 *  Unicode where possible: the UTF-8 strings on Windows will be converted
 *  and used with the multibyte Windows APIs, for example.
 *
 * PhysicsFS offers basic encoding conversion support, but not a whole string
 *  library. Get your stuff into whatever format you can work with.
 *
 * Some platforms and archivers don't offer full Unicode support behind the
 *  scenes. For example, OS/2 only offers "codepages" and the filesystem
 *  itself doesn't support multibyte encodings. We make an earnest effort to
 *  convert to/from the current locale here, but all bets are off if
 *  you want to hand an arbitrary Japanese character through to these systems.
 *  Modern OSes (Mac OS X, Linux, Windows, PocketPC, etc) should all be fine.
 *  Many game-specific archivers are seriously unprepared for Unicode (the
 *  Descent HOG/MVL and Build Engine GRP archivers, for example, only offer a
 *  DOS 8.3 filename, for example). Nothing can be done for these, but they
 *  tend to be legacy formats for existing content that was all ASCII (and
 *  thus, valid UTF-8) anyhow. Other formats, like .ZIP, don't explicitly
 *  offer Unicode support, but unofficially expect filenames to be UTF-8
 *  encoded, and thus Just Work. Most everything does the right thing without
 *  bothering you, but it's good to be aware of these nuances in case they
 *  don't.
 *
 *
 * Other stuff:
 *
 * Please see the file LICENSE.txt in the source's root directory for licensing
 *  and redistribution rights.
 *
 * Please see the file CREDITS.txt in the source's root directory for a more or
 *  less complete list of who's responsible for this.
 *
 *  \author Ryan C. Gordon.
 */

#ifndef _INCLUDE_PHYSFS_H_
#define _INCLUDE_PHYSFS_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef DOXYGEN_SHOULD_IGNORE_THIS
#if (defined _MSC_VER)
#define __EXPORT__ __declspec(dllexport)
#elif (__GNUC__ >= 3)
#define __EXPORT__ __attribute__((visibility("default")))
#else
#define __EXPORT__
#endif
#endif  /* DOXYGEN_SHOULD_IGNORE_THIS */

/**
 * \typedef PHYSFS_uint8
 * \brief An unsigned, 8-bit integer type.
 */
typedef unsigned char         PHYSFS_uint8;

/**
 * \typedef PHYSFS_sint8
 * \brief A signed, 8-bit integer type.
 */
typedef signed char           PHYSFS_sint8;

/**
 * \typedef PHYSFS_uint16
 * \brief An unsigned, 16-bit integer type.
 */
typedef unsigned short        PHYSFS_uint16;

/**
 * \typedef PHYSFS_sint16
 * \brief A signed, 16-bit integer type.
 */
typedef signed short          PHYSFS_sint16;

/**
 * \typedef PHYSFS_uint32
 * \brief An unsigned, 32-bit integer type.
 */
typedef unsigned int          PHYSFS_uint32;

/**
 * \typedef PHYSFS_sint32
 * \brief A signed, 32-bit integer type.
 */
typedef signed int            PHYSFS_sint32;

/**
 * \typedef PHYSFS_uint64
 * \brief An unsigned, 64-bit integer type.
 * \warning on platforms without any sort of 64-bit datatype, this is
 *           equivalent to PHYSFS_uint32!
 */

/**
 * \typedef PHYSFS_sint64
 * \brief A signed, 64-bit integer type.
 * \warning on platforms without any sort of 64-bit datatype, this is
 *           equivalent to PHYSFS_sint32!
 */


#if (defined PHYSFS_NO_64BIT_SUPPORT)  /* oh well. */
typedef PHYSFS_uint32         PHYSFS_uint64;
typedef PHYSFS_sint32         PHYSFS_sint64;
#elif (defined _MSC_VER)
typedef signed __int64        PHYSFS_sint64;
typedef unsigned __int64      PHYSFS_uint64;
#else
typedef unsigned long long    PHYSFS_uint64;
typedef signed long long      PHYSFS_sint64;
#endif


#ifndef DOXYGEN_SHOULD_IGNORE_THIS
/* Make sure the types really have the right sizes */
#define PHYSFS_COMPILE_TIME_ASSERT(name, x)               \
       typedef int PHYSFS_dummy_ ## name[(x) * 2 - 1]

PHYSFS_COMPILE_TIME_ASSERT(uint8, sizeof(PHYSFS_uint8) == 1);
PHYSFS_COMPILE_TIME_ASSERT(sint8, sizeof(PHYSFS_sint8) == 1);
PHYSFS_COMPILE_TIME_ASSERT(uint16, sizeof(PHYSFS_uint16) == 2);
PHYSFS_COMPILE_TIME_ASSERT(sint16, sizeof(PHYSFS_sint16) == 2);
PHYSFS_COMPILE_TIME_ASSERT(uint32, sizeof(PHYSFS_uint32) == 4);
PHYSFS_COMPILE_TIME_ASSERT(sint32, sizeof(PHYSFS_sint32) == 4);

#ifndef PHYSFS_NO_64BIT_SUPPORT
PHYSFS_COMPILE_TIME_ASSERT(uint64, sizeof(PHYSFS_uint64) == 8);
PHYSFS_COMPILE_TIME_ASSERT(sint64, sizeof(PHYSFS_sint64) == 8);
#endif

#undef PHYSFS_COMPILE_TIME_ASSERT

#endif  /* DOXYGEN_SHOULD_IGNORE_THIS */


/**
 * \struct PHYSFS_File
 * \brief A PhysicsFS file handle.
 *
 * You get a pointer to one of these when you open a file for reading,
 *  writing, or appending via PhysicsFS.
 *
 * As you can see from the lack of meaningful fields, you should treat this
 *  as opaque data. Don't try to manipulate the file handle, just pass the
 *  pointer you got, unmolested, to various PhysicsFS APIs.
 *
 * \sa PHYSFS_openRead
 * \sa PHYSFS_openWrite
 * \sa PHYSFS_openAppend
 * \sa PHYSFS_close
 * \sa PHYSFS_read
 * \sa PHYSFS_write
 * \sa PHYSFS_seek
 * \sa PHYSFS_tell
 * \sa PHYSFS_eof
 * \sa PHYSFS_setBuffer
 * \sa PHYSFS_flush
 */
typedef struct PHYSFS_File
{
    void *opaque;  /**< That's all you get. Don't touch. */
} PHYSFS_File;


/**
 * \def PHYSFS_file
 * \brief 1.0 API compatibility define.
 *
 * PHYSFS_file is identical to PHYSFS_File. This #define is here for backwards
 *  compatibility with the 1.0 API, which had an inconsistent capitalization
 *  convention in this case. New code should use PHYSFS_File, as this #define
 *  may go away someday.
 *
 * \sa PHYSFS_File
 */
#define PHYSFS_file PHYSFS_File


/**
 * \struct PHYSFS_ArchiveInfo
 * \brief Information on various PhysicsFS-supported archives.
 *
 * This structure gives you details on what sort of archives are supported
 *  by this implementation of PhysicsFS. Archives tend to be things like
 *  ZIP files and such.
 *
 * \warning Not all binaries are created equal! PhysicsFS can be built with
 *          or without support for various archives. You can check with
 *          PHYSFS_supportedArchiveTypes() to see if your archive type is
 *          supported.
 *
 * \sa PHYSFS_supportedArchiveTypes
 */
typedef struct PHYSFS_ArchiveInfo
{
    const char *extension;   /**< Archive file extension: "ZIP", for example. */
    const char *description; /**< Human-readable archive description. */
    const char *author;      /**< Person who did support for this archive. */
    const char *url;         /**< URL related to this archive */
} PHYSFS_ArchiveInfo;


/**
 * \struct PHYSFS_Version
 * \brief Information the version of PhysicsFS in use.
 *
 * Represents the library's version as three levels: major revision
 *  (increments with massive changes, additions, and enhancements),
 *  minor revision (increments with backwards-compatible changes to the
 *  major revision), and patchlevel (increments with fixes to the minor
 *  revision).
 *
 * \sa PHYSFS_VERSION
 * \sa PHYSFS_getLinkedVersion
 */
typedef struct PHYSFS_Version
{
    PHYSFS_uint8 major; /**< major revision */
    PHYSFS_uint8 minor; /**< minor revision */
    PHYSFS_uint8 patch; /**< patchlevel */
} PHYSFS_Version;

#ifndef DOXYGEN_SHOULD_IGNORE_THIS
#define PHYSFS_VER_MAJOR 2
#define PHYSFS_VER_MINOR 0
#define PHYSFS_VER_PATCH 1
#endif  /* DOXYGEN_SHOULD_IGNORE_THIS */


/* PhysicsFS state stuff ... */

/**
 * \def PHYSFS_VERSION(x)
 * \brief Macro to determine PhysicsFS version program was compiled against.
 *
 * This macro fills in a PHYSFS_Version structure with the version of the
 *  library you compiled against. This is determined by what header the
 *  compiler uses. Note that if you dynamically linked the library, you might
 *  have a slightly newer or older version at runtime. That version can be
 *  determined with PHYSFS_getLinkedVersion(), which, unlike PHYSFS_VERSION,
 *  is not a macro.
 *
 * \param x A pointer to a PHYSFS_Version struct to initialize.
 *
 * \sa PHYSFS_Version
 * \sa PHYSFS_getLinkedVersion
 */
#define PHYSFS_VERSION(x) \
{ \
    (x)->major = PHYSFS_VER_MAJOR; \
    (x)->minor = PHYSFS_VER_MINOR; \
    (x)->patch = PHYSFS_VER_PATCH; \
}


/**
 * \fn void PHYSFS_getLinkedVersion(PHYSFS_Version *ver)
 * \brief Get the version of PhysicsFS that is linked against your program.
 *
 * If you are using a shared library (DLL) version of PhysFS, then it is
 *  possible that it will be different than the version you compiled against.
 *
 * This is a real function; the macro PHYSFS_VERSION tells you what version
 *  of PhysFS you compiled against:
 *
 * \code
 * PHYSFS_Version compiled;
 * PHYSFS_Version linked;
 *
 * PHYSFS_VERSION(&compiled);
 * PHYSFS_getLinkedVersion(&linked);
 * printf("We compiled against PhysFS version %d.%d.%d ...\n",
 *           compiled.major, compiled.minor, compiled.patch);
 * printf("But we linked against PhysFS version %d.%d.%d.\n",
 *           linked.major, linked.minor, linked.patch);
 * \endcode
 *
 * This function may be called safely at any time, even before PHYSFS_init().
 *
 * \sa PHYSFS_VERSION
 */
__EXPORT__ void PHYSFS_getLinkedVersion(PHYSFS_Version *ver);


/**
 * \fn int PHYSFS_init(const char *argv0)
 * \brief Initialize the PhysicsFS library.
 *
 * This must be called before any other PhysicsFS function.
 *
 * This should be called prior to any attempts to change your process's
 *  current working directory.
 *
 *   \param argv0 the argv[0] string passed to your program's mainline.
 *          This may be NULL on most platforms (such as ones without a
 *          standard main() function), but you should always try to pass
 *          something in here. Unix-like systems such as Linux _need_ to
 *          pass argv[0] from main() in here.
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_deinit
 * \sa PHYSFS_isInit
 */
__EXPORT__ int PHYSFS_init(const char *argv0);


/**
 * \fn int PHYSFS_deinit(void)
 * \brief Deinitialize the PhysicsFS library.
 *
 * This closes any files opened via PhysicsFS, blanks the search/write paths,
 *  frees memory, and invalidates all of your file handles.
 *
 * Note that this call can FAIL if there's a file open for writing that
 *  refuses to close (for example, the underlying operating system was
 *  buffering writes to network filesystem, and the fileserver has crashed,
 *  or a hard drive has failed, etc). It is usually best to close all write
 *  handles yourself before calling this function, so that you can gracefully
 *  handle a specific failure.
 *
 * Once successfully deinitialized, PHYSFS_init() can be called again to
 *  restart the subsystem. All default API states are restored at this
 *  point, with the exception of any custom allocator you might have
 *  specified, which survives between initializations.
 *
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError(). If failure, state of PhysFS is
 *          undefined, and probably badly screwed up.
 *
 * \sa PHYSFS_init
 * \sa PHYSFS_isInit
 */
__EXPORT__ int PHYSFS_deinit(void);


/**
 * \fn const PHYSFS_ArchiveInfo **PHYSFS_supportedArchiveTypes(void)
 * \brief Get a list of supported archive types.
 *
 * Get a list of archive types supported by this implementation of PhysicFS.
 *  These are the file formats usable for search path entries. This is for
 *  informational purposes only. Note that the extension listed is merely
 *  convention: if we list "ZIP", you can open a PkZip-compatible archive
 *  with an extension of "XYZ", if you like.
 *
 * The returned value is an array of pointers to PHYSFS_ArchiveInfo structures,
 *  with a NULL entry to signify the end of the list:
 *
 * \code
 * PHYSFS_ArchiveInfo **i;
 *
 * for (i = PHYSFS_supportedArchiveTypes(); *i != NULL; i++)
 * {
 *     printf("Supported archive: [%s], which is [%s].\n",
 *              (*i)->extension, (*i)->description);
 * }
 * \endcode
 *
 * The return values are pointers to static internal memory, and should
 *  be considered READ ONLY, and never freed.
 *
 *   \return READ ONLY Null-terminated array of READ ONLY structures.
 */
__EXPORT__ const PHYSFS_ArchiveInfo **PHYSFS_supportedArchiveTypes(void);


/**
 * \fn void PHYSFS_freeList(void *listVar)
 * \brief Deallocate resources of lists returned by PhysicsFS.
 *
 * Certain PhysicsFS functions return lists of information that are
 *  dynamically allocated. Use this function to free those resources.
 *
 *   \param listVar List of information specified as freeable by this function.
 *
 * \sa PHYSFS_getCdRomDirs
 * \sa PHYSFS_enumerateFiles
 * \sa PHYSFS_getSearchPath
 */
__EXPORT__ void PHYSFS_freeList(void *listVar);


/**
 * \fn const char *PHYSFS_getLastError(void)
 * \brief Get human-readable error information.
 *
 * Get the last PhysicsFS error message as a human-readable, null-terminated
 *  string. This will be NULL if there's been no error since the last call to
 *  this function. The pointer returned by this call points to an internal
 *  buffer. Each thread has a unique error state associated with it, but each
 *  time a new error message is set, it will overwrite the previous one
 *  associated with that thread. It is safe to call this function at anytime,
 *  even before PHYSFS_init().
 *
 * It is not wise to expect a specific string of characters here, since the
 *  error message may be localized into an unfamiliar language. These strings
 *  are meant to be passed on directly to the user.
 *
 *   \return READ ONLY string of last error message.
 */
__EXPORT__ const char *PHYSFS_getLastError(void);


/**
 * \fn const char *PHYSFS_getDirSeparator(void)
 * \brief Get platform-dependent dir separator string.
 *
 * This returns "\\" on win32, "/" on Unix, and ":" on MacOS. It may be more
 *  than one character, depending on the platform, and your code should take
 *  that into account. Note that this is only useful for setting up the
 *  search/write paths, since access into those dirs always use '/'
 *  (platform-independent notation) to separate directories. This is also
 *  handy for getting platform-independent access when using stdio calls.
 *
 *   \return READ ONLY null-terminated string of platform's dir separator.
 */
__EXPORT__ const char *PHYSFS_getDirSeparator(void);


/**
 * \fn void PHYSFS_permitSymbolicLinks(int allow)
 * \brief Enable or disable following of symbolic links.
 *
 * Some physical filesystems and archives contain files that are just pointers
 *  to other files. On the physical filesystem, opening such a link will
 *  (transparently) open the file that is pointed to.
 *
 * By default, PhysicsFS will check if a file is really a symlink during open
 *  calls and fail if it is. Otherwise, the link could take you outside the
 *  write and search paths, and compromise security.
 *
 * If you want to take that risk, call this function with a non-zero parameter.
 *  Note that this is more for sandboxing a program's scripting language, in
 *  case untrusted scripts try to compromise the system. Generally speaking,
 *  a user could very well have a legitimate reason to set up a symlink, so
 *  unless you feel there's a specific danger in allowing them, you should
 *  permit them.
 *
 * Symlinks are only explicitly checked when dealing with filenames
 *  in platform-independent notation. That is, when setting up your
 *  search and write paths, etc, symlinks are never checked for.
 *
 * Symbolic link permission can be enabled or disabled at any time after
 *  you've called PHYSFS_init(), and is disabled by default.
 *
 *   \param allow nonzero to permit symlinks, zero to deny linking.
 *
 * \sa PHYSFS_symbolicLinksPermitted
 */
__EXPORT__ void PHYSFS_permitSymbolicLinks(int allow);


/* !!! FIXME: const this? */
/**
 * \fn char **PHYSFS_getCdRomDirs(void)
 * \brief Get an array of paths to available CD-ROM drives.
 *
 * The dirs returned are platform-dependent ("D:\" on Win32, "/cdrom" or
 *  whatnot on Unix). Dirs are only returned if there is a disc ready and
 *  accessible in the drive. So if you've got two drives (D: and E:), and only
 *  E: has a disc in it, then that's all you get. If the user inserts a disc
 *  in D: and you call this function again, you get both drives. If, on a
 *  Unix box, the user unmounts a disc and remounts it elsewhere, the next
 *  call to this function will reflect that change.
 *
 * This function refers to "CD-ROM" media, but it really means "inserted disc
 *  media," such as DVD-ROM, HD-DVD, CDRW, and Blu-Ray discs. It looks for
 *  filesystems, and as such won't report an audio CD, unless there's a
 *  mounted filesystem track on it.
 *
 * The returned value is an array of strings, with a NULL entry to signify the
 *  end of the list:
 *
 * \code
 * char **cds = PHYSFS_getCdRomDirs();
 * char **i;
 *
 * for (i = cds; *i != NULL; i++)
 *     printf("cdrom dir [%s] is available.\n", *i);
 *
 * PHYSFS_freeList(cds);
 * \endcode
 *
 * This call may block while drives spin up. Be forewarned.
 *
 * When you are done with the returned information, you may dispose of the
 *  resources by calling PHYSFS_freeList() with the returned pointer.
 *
 *   \return Null-terminated array of null-terminated strings.
 *
 * \sa PHYSFS_getCdRomDirsCallback
 */
__EXPORT__ char **PHYSFS_getCdRomDirs(void);


/**
 * \fn const char *PHYSFS_getBaseDir(void)
 * \brief Get the path where the application resides.
 *
 * Helper function.
 *
 * Get the "base dir". This is the directory where the application was run
 *  from, which is probably the installation directory, and may or may not
 *  be the process's current working directory.
 *
 * You should probably use the base dir in your search path.
 *
 *  \return READ ONLY string of base dir in platform-dependent notation.
 *
 * \sa PHYSFS_getUserDir
 */
__EXPORT__ const char *PHYSFS_getBaseDir(void);


/**
 * \fn const char *PHYSFS_getUserDir(void)
 * \brief Get the path where user's home directory resides.
 *
 * Helper function.
 *
 * Get the "user dir". This is meant to be a suggestion of where a specific
 *  user of the system can store files. On Unix, this is her home directory.
 *  On systems with no concept of multiple home directories (MacOS, win95),
 *  this will default to something like "C:\mybasedir\users\username"
 *  where "username" will either be the login name, or "default" if the
 *  platform doesn't support multiple users, either.
 *
 * You should probably use the user dir as the basis for your write dir, and
 *  also put it near the beginning of your search path.
 *
 *  \return READ ONLY string of user dir in platform-dependent notation.
 *
 * \sa PHYSFS_getBaseDir
 */
__EXPORT__ const char *PHYSFS_getUserDir(void);


/**
 * \fn const char *PHYSFS_getWriteDir(void)
 * \brief Get path where PhysicsFS will allow file writing.
 *
 * Get the current write dir. The default write dir is NULL.
 *
 *  \return READ ONLY string of write dir in platform-dependent notation,
 *           OR NULL IF NO WRITE PATH IS CURRENTLY SET.
 *
 * \sa PHYSFS_setWriteDir
 */
__EXPORT__ const char *PHYSFS_getWriteDir(void);


/**
 * \fn int PHYSFS_setWriteDir(const char *newDir)
 * \brief Tell PhysicsFS where it may write files.
 *
 * Set a new write dir. This will override the previous setting.
 *
 * This call will fail (and fail to change the write dir) if the current
 *  write dir still has files open in it.
 *
 *   \param newDir The new directory to be the root of the write dir,
 *                   specified in platform-dependent notation. Setting to NULL
 *                   disables the write dir, so no files can be opened for
 *                   writing via PhysicsFS.
 *  \return non-zero on success, zero on failure. All attempts to open a file
 *           for writing via PhysicsFS will fail until this call succeeds.
 *           Specifics of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_getWriteDir
 */
__EXPORT__ int PHYSFS_setWriteDir(const char *newDir);


/**
 * \fn int PHYSFS_addToSearchPath(const char *newDir, int appendToPath)
 * \brief Add an archive or directory to the search path.
 *
 * This is a legacy call in PhysicsFS 2.0, equivalent to:
 *     PHYSFS_mount(newDir, NULL, appendToPath);
 *
 * You must use this and not PHYSFS_mount if binary compatibility with
 *  PhysicsFS 1.0 is important (which it may not be for many people).
 *
 * \sa PHYSFS_mount
 * \sa PHYSFS_removeFromSearchPath
 * \sa PHYSFS_getSearchPath
 */
__EXPORT__ int PHYSFS_addToSearchPath(const char *newDir, int appendToPath);


/**
 * \fn int PHYSFS_removeFromSearchPath(const char *oldDir)
 * \brief Remove a directory or archive from the search path.
 *
 * This must be a (case-sensitive) match to a dir or archive already in the
 *  search path, specified in platform-dependent notation.
 *
 * This call will fail (and fail to remove from the path) if the element still
 *  has files open in it.
 *
 *    \param oldDir dir/archive to remove.
 *   \return nonzero on success, zero on failure.
 *            Specifics of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_addToSearchPath
 * \sa PHYSFS_getSearchPath
 */
__EXPORT__ int PHYSFS_removeFromSearchPath(const char *oldDir);


/**
 * \fn char **PHYSFS_getSearchPath(void)
 * \brief Get the current search path.
 *
 * The default search path is an empty list.
 *
 * The returned value is an array of strings, with a NULL entry to signify the
 *  end of the list:
 *
 * \code
 * char **i;
 *
 * for (i = PHYSFS_getSearchPath(); *i != NULL; i++)
 *     printf("[%s] is in the search path.\n", *i);
 * \endcode
 *
 * When you are done with the returned information, you may dispose of the
 *  resources by calling PHYSFS_freeList() with the returned pointer.
 *
 *   \return Null-terminated array of null-terminated strings. NULL if there
 *            was a problem (read: OUT OF MEMORY).
 *
 * \sa PHYSFS_getSearchPathCallback
 * \sa PHYSFS_addToSearchPath
 * \sa PHYSFS_removeFromSearchPath
 */
__EXPORT__ char **PHYSFS_getSearchPath(void);


/**
 * \fn int PHYSFS_setSaneConfig(const char *organization, const char *appName, const char *archiveExt, int includeCdRoms, int archivesFirst)
 * \brief Set up sane, default paths.
 *
 * Helper function.
 *
 * The write dir will be set to "userdir/.organization/appName", which is
 *  created if it doesn't exist.
 *
 * The above is sufficient to make sure your program's configuration directory
 *  is separated from other clutter, and platform-independent. The period
 *  before "mygame" even hides the directory on Unix systems.
 *
 *  The search path will be:
 *
 *    - The Write Dir (created if it doesn't exist)
 *    - The Base Dir (PHYSFS_getBaseDir())
 *    - All found CD-ROM dirs (optionally)
 *
 * These directories are then searched for files ending with the extension
 *  (archiveExt), which, if they are valid and supported archives, will also
 *  be added to the search path. If you specified "PKG" for (archiveExt), and
 *  there's a file named data.PKG in the base dir, it'll be checked. Archives
 *  can either be appended or prepended to the search path in alphabetical
 *  order, regardless of which directories they were found in.
 *
 * All of this can be accomplished from the application, but this just does it
 *  all for you. Feel free to add more to the search path manually, too.
 *
 *    \param organization Name of your company/group/etc to be used as a
 *                         dirname, so keep it small, and no-frills.
 *
 *    \param appName Program-specific name of your program, to separate it
 *                   from other programs using PhysicsFS.
 *
 *    \param archiveExt File extension used by your program to specify an
 *                      archive. For example, Quake 3 uses "pk3", even though
 *                      they are just zipfiles. Specify NULL to not dig out
 *                      archives automatically. Do not specify the '.' char;
 *                      If you want to look for ZIP files, specify "ZIP" and
 *                      not ".ZIP" ... the archive search is case-insensitive.
 *
 *    \param includeCdRoms Non-zero to include CD-ROMs in the search path, and
 *                         (if (archiveExt) != NULL) search them for archives.
 *                         This may cause a significant amount of blocking
 *                         while discs are accessed, and if there are no discs
 *                         in the drive (or even not mounted on Unix systems),
 *                         then they may not be made available anyhow. You may
 *                         want to specify zero and handle the disc setup
 *                         yourself.
 *
 *    \param archivesFirst Non-zero to prepend the archives to the search path.
 *                          Zero to append them. Ignored if !(archiveExt).
 *
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_setSaneConfig(const char *organization,
                                    const char *appName,
                                    const char *archiveExt,
                                    int includeCdRoms,
                                    int archivesFirst);


/* Directory management stuff ... */

/**
 * \fn int PHYSFS_mkdir(const char *dirName)
 * \brief Create a directory.
 *
 * This is specified in platform-independent notation in relation to the
 *  write dir. All missing parent directories are also created if they
 *  don't exist.
 *
 * So if you've got the write dir set to "C:\mygame\writedir" and call
 *  PHYSFS_mkdir("downloads/maps") then the directories
 *  "C:\mygame\writedir\downloads" and "C:\mygame\writedir\downloads\maps"
 *  will be created if possible. If the creation of "maps" fails after we
 *  have successfully created "downloads", then the function leaves the
 *  created directory behind and reports failure.
 *
 *   \param dirName New dir to create.
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_delete
 */
__EXPORT__ int PHYSFS_mkdir(const char *dirName);


/**
 * \fn int PHYSFS_delete(const char *filename)
 * \brief Delete a file or directory.
 *
 * (filename) is specified in platform-independent notation in relation to the
 *  write dir.
 *
 * A directory must be empty before this call can delete it.
 *
 * Deleting a symlink will remove the link, not what it points to, regardless
 *  of whether you "permitSymLinks" or not.
 *
 * So if you've got the write dir set to "C:\mygame\writedir" and call
 *  PHYSFS_delete("downloads/maps/level1.map") then the file
 *  "C:\mygame\writedir\downloads\maps\level1.map" is removed from the
 *  physical filesystem, if it exists and the operating system permits the
 *  deletion.
 *
 * Note that on Unix systems, deleting a file may be successful, but the
 *  actual file won't be removed until all processes that have an open
 *  filehandle to it (including your program) close their handles.
 *
 * Chances are, the bits that make up the file still exist, they are just
 *  made available to be written over at a later point. Don't consider this
 *  a security method or anything.  :)
 *
 *   \param filename Filename to delete.
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_delete(const char *filename);


/**
 * \fn const char *PHYSFS_getRealDir(const char *filename)
 * \brief Figure out where in the search path a file resides.
 *
 * The file is specified in platform-independent notation. The returned
 *  filename will be the element of the search path where the file was found,
 *  which may be a directory, or an archive. Even if there are multiple
 *  matches in different parts of the search path, only the first one found
 *  is used, just like when opening a file.
 *
 * So, if you look for "maps/level1.map", and C:\\mygame is in your search
 *  path and C:\\mygame\\maps\\level1.map exists, then "C:\mygame" is returned.
 *
 * If a any part of a match is a symbolic link, and you've not explicitly
 *  permitted symlinks, then it will be ignored, and the search for a match
 *  will continue.
 *
 * If you specify a fake directory that only exists as a mount point, it'll
 *  be associated with the first archive mounted there, even though that
 *  directory isn't necessarily contained in a real archive.
 *
 *     \param filename file to look for.
 *    \return READ ONLY string of element of search path containing the
 *             the file in question. NULL if not found.
 */
__EXPORT__ const char *PHYSFS_getRealDir(const char *filename);


/**
 * \fn char **PHYSFS_enumerateFiles(const char *dir)
 * \brief Get a file listing of a search path's directory.
 *
 * Matching directories are interpolated. That is, if "C:\mydir" is in the
 *  search path and contains a directory "savegames" that contains "x.sav",
 *  "y.sav", and "z.sav", and there is also a "C:\userdir" in the search path
 *  that has a "savegames" subdirectory with "w.sav", then the following code:
 *
 * \code
 * char **rc = PHYSFS_enumerateFiles("savegames");
 * char **i;
 *
 * for (i = rc; *i != NULL; i++)
 *     printf(" * We've got [%s].\n", *i);
 *
 * PHYSFS_freeList(rc);
 * \endcode
 *
 *  \...will print:
 *
 * \verbatim
 * We've got [x.sav].
 * We've got [y.sav].
 * We've got [z.sav].
 * We've got [w.sav].\endverbatim
 *
 * Feel free to sort the list however you like. We only promise there will
 *  be no duplicates, but not what order the final list will come back in.
 *
 * Don't forget to call PHYSFS_freeList() with the return value from this
 *  function when you are done with it.
 *
 *    \param dir directory in platform-independent notation to enumerate.
 *   \return Null-terminated array of null-terminated strings.
 *
 * \sa PHYSFS_enumerateFilesCallback
 */
__EXPORT__ char **PHYSFS_enumerateFiles(const char *dir);


/**
 * \fn int PHYSFS_exists(const char *fname)
 * \brief Determine if a file exists in the search path.
 *
 * Reports true if there is an entry anywhere in the search path by the
 *  name of (fname).
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, so you
 *  might end up further down in the search path than expected.
 *
 *    \param fname filename in platform-independent notation.
 *   \return non-zero if filename exists. zero otherwise.
 *
 * \sa PHYSFS_isDirectory
 * \sa PHYSFS_isSymbolicLink
 */
__EXPORT__ int PHYSFS_exists(const char *fname);


/**
 * \fn int PHYSFS_isDirectory(const char *fname)
 * \brief Determine if a file in the search path is really a directory.
 *
 * Determine if the first occurence of (fname) in the search path is
 *  really a directory entry.
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, so you
 *  might end up further down in the search path than expected.
 *
 *    \param fname filename in platform-independent notation.
 *   \return non-zero if filename exists and is a directory.  zero otherwise.
 *
 * \sa PHYSFS_exists
 * \sa PHYSFS_isSymbolicLink
 */
__EXPORT__ int PHYSFS_isDirectory(const char *fname);


/**
 * \fn int PHYSFS_isSymbolicLink(const char *fname)
 * \brief Determine if a file in the search path is really a symbolic link.
 *
 * Determine if the first occurence of (fname) in the search path is
 *  really a symbolic link.
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, and as such,
 *  this function will always return 0 in that case.
 *
 *    \param fname filename in platform-independent notation.
 *   \return non-zero if filename exists and is a symlink.  zero otherwise.
 *
 * \sa PHYSFS_exists
 * \sa PHYSFS_isDirectory
 */
__EXPORT__ int PHYSFS_isSymbolicLink(const char *fname);


/**
 * \fn PHYSFS_sint64 PHYSFS_getLastModTime(const char *filename)
 * \brief Get the last modification time of a file.
 *
 * The modtime is returned as a number of seconds since the epoch
 *  (Jan 1, 1970). The exact derivation and accuracy of this time depends on
 *  the particular archiver. If there is no reasonable way to obtain this
 *  information for a particular archiver, or there was some sort of error,
 *  this function returns (-1).
 *
 *   \param filename filename to check, in platform-independent notation.
 *  \return last modified time of the file. -1 if it can't be determined.
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_getLastModTime(const char *filename);


/* i/o stuff... */

/**
 * \fn PHYSFS_File *PHYSFS_openWrite(const char *filename)
 * \brief Open a file for writing.
 *
 * Open a file for writing, in platform-independent notation and in relation
 *  to the write dir as the root of the writable filesystem. The specified
 *  file is created if it doesn't exist. If it does exist, it is truncated to
 *  zero bytes, and the writing offset is set to the start.
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, and opening a
 *  symlink with this function will fail in such a case.
 *
 *   \param filename File to open.
 *  \return A valid PhysicsFS filehandle on success, NULL on error. Specifics
 *           of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_openRead
 * \sa PHYSFS_openAppend
 * \sa PHYSFS_write
 * \sa PHYSFS_close
 */
__EXPORT__ PHYSFS_File *PHYSFS_openWrite(const char *filename);


/**
 * \fn PHYSFS_File *PHYSFS_openAppend(const char *filename)
 * \brief Open a file for appending.
 *
 * Open a file for writing, in platform-independent notation and in relation
 *  to the write dir as the root of the writable filesystem. The specified
 *  file is created if it doesn't exist. If it does exist, the writing offset
 *  is set to the end of the file, so the first write will be the byte after
 *  the end.
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, and opening a
 *  symlink with this function will fail in such a case.
 *
 *   \param filename File to open.
 *  \return A valid PhysicsFS filehandle on success, NULL on error. Specifics
 *           of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_openRead
 * \sa PHYSFS_openWrite
 * \sa PHYSFS_write
 * \sa PHYSFS_close
 */
__EXPORT__ PHYSFS_File *PHYSFS_openAppend(const char *filename);


/**
 * \fn PHYSFS_File *PHYSFS_openRead(const char *filename)
 * \brief Open a file for reading.
 *
 * Open a file for reading, in platform-independent notation. The search path
 *  is checked one at a time until a matching file is found, in which case an
 *  abstract filehandle is associated with it, and reading may be done.
 *  The reading offset is set to the first byte of the file.
 *
 * Note that entries that are symlinks are ignored if
 *  PHYSFS_permitSymbolicLinks(1) hasn't been called, and opening a
 *  symlink with this function will fail in such a case.
 *
 *   \param filename File to open.
 *  \return A valid PhysicsFS filehandle on success, NULL on error. Specifics
 *           of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_openWrite
 * \sa PHYSFS_openAppend
 * \sa PHYSFS_read
 * \sa PHYSFS_close
 */
__EXPORT__ PHYSFS_File *PHYSFS_openRead(const char *filename);


/**
 * \fn int PHYSFS_close(PHYSFS_File *handle)
 * \brief Close a PhysicsFS filehandle.
 *
 * This call is capable of failing if the operating system was buffering
 *  writes to the physical media, and, now forced to write those changes to
 *  physical media, can not store the data for some reason. In such a case,
 *  the filehandle stays open. A well-written program should ALWAYS check the
 *  return value from the close call in addition to every writing call!
 *
 *   \param handle handle returned from PHYSFS_open*().
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_openRead
 * \sa PHYSFS_openWrite
 * \sa PHYSFS_openAppend
 */
__EXPORT__ int PHYSFS_close(PHYSFS_File *handle);


/**
 * \fn PHYSFS_sint64 PHYSFS_read(PHYSFS_File *handle, void *buffer, PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
 * \brief Read data from a PhysicsFS filehandle
 *
 * The file must be opened for reading.
 *
 *   \param handle handle returned from PHYSFS_openRead().
 *   \param buffer buffer to store read data into.
 *   \param objSize size in bytes of objects being read from (handle).
 *   \param objCount number of (objSize) objects to read from (handle).
 *  \return number of objects read. PHYSFS_getLastError() can shed light on
 *           the reason this might be < (objCount), as can PHYSFS_eof().
 *            -1 if complete failure.
 *
 * \sa PHYSFS_eof
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_read(PHYSFS_File *handle,
                                     void *buffer,
                                     PHYSFS_uint32 objSize,
                                     PHYSFS_uint32 objCount);

/**
 * \fn PHYSFS_sint64 PHYSFS_write(PHYSFS_File *handle, const void *buffer, PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
 * \brief Write data to a PhysicsFS filehandle
 *
 * The file must be opened for writing.
 *
 *   \param handle retval from PHYSFS_openWrite() or PHYSFS_openAppend().
 *   \param buffer buffer to store read data into.
 *   \param objSize size in bytes of objects being read from (handle).
 *   \param objCount number of (objSize) objects to read from (handle).
 *  \return number of objects written. PHYSFS_getLastError() can shed light on
 *           the reason this might be < (objCount). -1 if complete failure.
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_write(PHYSFS_File *handle,
                                      const void *buffer,
                                      PHYSFS_uint32 objSize,
                                      PHYSFS_uint32 objCount);


/* File position stuff... */

/**
 * \fn int PHYSFS_eof(PHYSFS_File *handle)
 * \brief Check for end-of-file state on a PhysicsFS filehandle.
 *
 * Determine if the end of file has been reached in a PhysicsFS filehandle.
 *
 *   \param handle handle returned from PHYSFS_openRead().
 *  \return nonzero if EOF, zero if not.
 *
 * \sa PHYSFS_read
 * \sa PHYSFS_tell
 */
__EXPORT__ int PHYSFS_eof(PHYSFS_File *handle);


/**
 * \fn PHYSFS_sint64 PHYSFS_tell(PHYSFS_File *handle)
 * \brief Determine current position within a PhysicsFS filehandle.
 *
 *   \param handle handle returned from PHYSFS_open*().
 *  \return offset in bytes from start of file. -1 if error occurred.
 *           Specifics of the error can be gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_seek
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_tell(PHYSFS_File *handle);


/**
 * \fn int PHYSFS_seek(PHYSFS_File *handle, PHYSFS_uint64 pos)
 * \brief Seek to a new position within a PhysicsFS filehandle.
 *
 * The next read or write will occur at that place. Seeking past the
 *  beginning or end of the file is not allowed, and causes an error.
 *
 *   \param handle handle returned from PHYSFS_open*().
 *   \param pos number of bytes from start of file to seek to.
 *  \return nonzero on success, zero on error. Specifics of the error can be
 *          gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_tell
 */
__EXPORT__ int PHYSFS_seek(PHYSFS_File *handle, PHYSFS_uint64 pos);


/**
 * \fn PHYSFS_sint64 PHYSFS_fileLength(PHYSFS_File *handle)
 * \brief Get total length of a file in bytes.
 *
 * Note that if the file size can't be determined (since the archive is
 *  "streamed" or whatnot) than this will report (-1). Also note that if
 *  another process/thread is writing to this file at the same time, then
 *  the information this function supplies could be incorrect before you
 *  get it. Use with caution, or better yet, don't use at all.
 *
 *   \param handle handle returned from PHYSFS_open*().
 *  \return size in bytes of the file. -1 if can't be determined.
 *
 * \sa PHYSFS_tell
 * \sa PHYSFS_seek
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_fileLength(PHYSFS_File *handle);


/* Buffering stuff... */

/**
 * \fn int PHYSFS_setBuffer(PHYSFS_File *handle, PHYSFS_uint64 bufsize)
 * \brief Set up buffering for a PhysicsFS file handle.
 *
 * Define an i/o buffer for a file handle. A memory block of (bufsize) bytes
 *  will be allocated and associated with (handle).
 *
 * For files opened for reading, up to (bufsize) bytes are read from (handle)
 *  and stored in the internal buffer. Calls to PHYSFS_read() will pull
 *  from this buffer until it is empty, and then refill it for more reading.
 *  Note that compressed files, like ZIP archives, will decompress while
 *  buffering, so this can be handy for offsetting CPU-intensive operations.
 *  The buffer isn't filled until you do your next read.
 *
 * For files opened for writing, data will be buffered to memory until the
 *  buffer is full or the buffer is flushed. Closing a handle implicitly
 *  causes a flush...check your return values!
 *
 * Seeking, etc transparently accounts for buffering.
 *
 * You can resize an existing buffer by calling this function more than once
 *  on the same file. Setting the buffer size to zero will free an existing
 *  buffer.
 *
 * PhysicsFS file handles are unbuffered by default.
 *
 * Please check the return value of this function! Failures can include
 *  not being able to seek backwards in a read-only file when removing the
 *  buffer, not being able to allocate the buffer, and not being able to
 *  flush the buffer to disk, among other unexpected problems.
 *
 *   \param handle handle returned from PHYSFS_open*().
 *   \param bufsize size, in bytes, of buffer to allocate.
 *  \return nonzero if successful, zero on error.
 *
 * \sa PHYSFS_flush
 * \sa PHYSFS_read
 * \sa PHYSFS_write
 * \sa PHYSFS_close
 */
__EXPORT__ int PHYSFS_setBuffer(PHYSFS_File *handle, PHYSFS_uint64 bufsize);


/**
 * \fn int PHYSFS_flush(PHYSFS_File *handle)
 * \brief Flush a buffered PhysicsFS file handle.
 *
 * For buffered files opened for writing, this will put the current contents
 *  of the buffer to disk and flag the buffer as empty if possible.
 *
 * For buffered files opened for reading or unbuffered files, this is a safe
 *  no-op, and will report success.
 *
 *   \param handle handle returned from PHYSFS_open*().
 *  \return nonzero if successful, zero on error.
 *
 * \sa PHYSFS_setBuffer
 * \sa PHYSFS_close
 */
__EXPORT__ int PHYSFS_flush(PHYSFS_File *handle);


/* Byteorder stuff... */

/**
 * \fn PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 val)
 * \brief Swap littleendian signed 16 to platform's native byte order.
 *
 * Take a 16-bit signed value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 val);


/**
 * \fn PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 val)
 * \brief Swap littleendian unsigned 16 to platform's native byte order.
 *
 * Take a 16-bit unsigned value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 val);

/**
 * \fn PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 val)
 * \brief Swap littleendian signed 32 to platform's native byte order.
 *
 * Take a 32-bit signed value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 val);


/**
 * \fn PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 val)
 * \brief Swap littleendian unsigned 32 to platform's native byte order.
 *
 * Take a 32-bit unsigned value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 val);

/**
 * \fn PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 val)
 * \brief Swap littleendian signed 64 to platform's native byte order.
 *
 * Take a 64-bit signed value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 val);


/**
 * \fn PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 val)
 * \brief Swap littleendian unsigned 64 to platform's native byte order.
 *
 * Take a 64-bit unsigned value in littleendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 val);


/**
 * \fn PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 val)
 * \brief Swap bigendian signed 16 to platform's native byte order.
 *
 * Take a 16-bit signed value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 val);


/**
 * \fn PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 val)
 * \brief Swap bigendian unsigned 16 to platform's native byte order.
 *
 * Take a 16-bit unsigned value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 val);

/**
 * \fn PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 val)
 * \brief Swap bigendian signed 32 to platform's native byte order.
 *
 * Take a 32-bit signed value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 val);


/**
 * \fn PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 val)
 * \brief Swap bigendian unsigned 32 to platform's native byte order.
 *
 * Take a 32-bit unsigned value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 */
__EXPORT__ PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 val);


/**
 * \fn PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 val)
 * \brief Swap bigendian signed 64 to platform's native byte order.
 *
 * Take a 64-bit signed value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 val);


/**
 * \fn PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 val)
 * \brief Swap bigendian unsigned 64 to platform's native byte order.
 *
 * Take a 64-bit unsigned value in bigendian format and convert it to
 *  the platform's native byte order.
 *
 *    \param val value to convert
 *   \return converted value.
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 val);


/**
 * \fn int PHYSFS_readSLE16(PHYSFS_File *file, PHYSFS_sint16 *val)
 * \brief Read and convert a signed 16-bit littleendian value.
 *
 * Convenience function. Read a signed 16-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_readSLE16(PHYSFS_File *file, PHYSFS_sint16 *val);


/**
 * \fn int PHYSFS_readULE16(PHYSFS_File *file, PHYSFS_uint16 *val)
 * \brief Read and convert an unsigned 16-bit littleendian value.
 *
 * Convenience function. Read an unsigned 16-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 */
__EXPORT__ int PHYSFS_readULE16(PHYSFS_File *file, PHYSFS_uint16 *val);


/**
 * \fn int PHYSFS_readSBE16(PHYSFS_File *file, PHYSFS_sint16 *val)
 * \brief Read and convert a signed 16-bit bigendian value.
 *
 * Convenience function. Read a signed 16-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_readSBE16(PHYSFS_File *file, PHYSFS_sint16 *val);


/**
 * \fn int PHYSFS_readUBE16(PHYSFS_File *file, PHYSFS_uint16 *val)
 * \brief Read and convert an unsigned 16-bit bigendian value.
 *
 * Convenience function. Read an unsigned 16-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 */
__EXPORT__ int PHYSFS_readUBE16(PHYSFS_File *file, PHYSFS_uint16 *val);


/**
 * \fn int PHYSFS_readSLE32(PHYSFS_File *file, PHYSFS_sint32 *val)
 * \brief Read and convert a signed 32-bit littleendian value.
 *
 * Convenience function. Read a signed 32-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_readSLE32(PHYSFS_File *file, PHYSFS_sint32 *val);


/**
 * \fn int PHYSFS_readULE32(PHYSFS_File *file, PHYSFS_uint32 *val)
 * \brief Read and convert an unsigned 32-bit littleendian value.
 *
 * Convenience function. Read an unsigned 32-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 */
__EXPORT__ int PHYSFS_readULE32(PHYSFS_File *file, PHYSFS_uint32 *val);


/**
 * \fn int PHYSFS_readSBE32(PHYSFS_File *file, PHYSFS_sint32 *val)
 * \brief Read and convert a signed 32-bit bigendian value.
 *
 * Convenience function. Read a signed 32-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_readSBE32(PHYSFS_File *file, PHYSFS_sint32 *val);


/**
 * \fn int PHYSFS_readUBE32(PHYSFS_File *file, PHYSFS_uint32 *val)
 * \brief Read and convert an unsigned 32-bit bigendian value.
 *
 * Convenience function. Read an unsigned 32-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 */
__EXPORT__ int PHYSFS_readUBE32(PHYSFS_File *file, PHYSFS_uint32 *val);


/**
 * \fn int PHYSFS_readSLE64(PHYSFS_File *file, PHYSFS_sint64 *val)
 * \brief Read and convert a signed 64-bit littleendian value.
 *
 * Convenience function. Read a signed 64-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_sint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_readSLE64(PHYSFS_File *file, PHYSFS_sint64 *val);


/**
 * \fn int PHYSFS_readULE64(PHYSFS_File *file, PHYSFS_uint64 *val)
 * \brief Read and convert an unsigned 64-bit littleendian value.
 *
 * Convenience function. Read an unsigned 64-bit littleendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_readULE64(PHYSFS_File *file, PHYSFS_uint64 *val);


/**
 * \fn int PHYSFS_readSBE64(PHYSFS_File *file, PHYSFS_sint64 *val)
 * \brief Read and convert a signed 64-bit bigendian value.
 *
 * Convenience function. Read a signed 64-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_sint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_readSBE64(PHYSFS_File *file, PHYSFS_sint64 *val);


/**
 * \fn int PHYSFS_readUBE64(PHYSFS_File *file, PHYSFS_uint64 *val)
 * \brief Read and convert an unsigned 64-bit bigendian value.
 *
 * Convenience function. Read an unsigned 64-bit bigendian value from a
 *  file and convert it to the platform's native byte order.
 *
 *    \param file PhysicsFS file handle from which to read.
 *    \param val pointer to where value should be stored.
 *   \return zero on failure, non-zero on success. If successful, (*val) will
 *           store the result. On failure, you can find out what went wrong
 *           from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_readUBE64(PHYSFS_File *file, PHYSFS_uint64 *val);


/**
 * \fn int PHYSFS_writeSLE16(PHYSFS_File *file, PHYSFS_sint16 val)
 * \brief Convert and write a signed 16-bit littleendian value.
 *
 * Convenience function. Convert a signed 16-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeSLE16(PHYSFS_File *file, PHYSFS_sint16 val);


/**
 * \fn int PHYSFS_writeULE16(PHYSFS_File *file, PHYSFS_uint16 val)
 * \brief Convert and write an unsigned 16-bit littleendian value.
 *
 * Convenience function. Convert an unsigned 16-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeULE16(PHYSFS_File *file, PHYSFS_uint16 val);


/**
 * \fn int PHYSFS_writeSBE16(PHYSFS_File *file, PHYSFS_sint16 val)
 * \brief Convert and write a signed 16-bit bigendian value.
 *
 * Convenience function. Convert a signed 16-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeSBE16(PHYSFS_File *file, PHYSFS_sint16 val);


/**
 * \fn int PHYSFS_writeUBE16(PHYSFS_File *file, PHYSFS_uint16 val)
 * \brief Convert and write an unsigned 16-bit bigendian value.
 *
 * Convenience function. Convert an unsigned 16-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeUBE16(PHYSFS_File *file, PHYSFS_uint16 val);


/**
 * \fn int PHYSFS_writeSLE32(PHYSFS_File *file, PHYSFS_sint32 val)
 * \brief Convert and write a signed 32-bit littleendian value.
 *
 * Convenience function. Convert a signed 32-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeSLE32(PHYSFS_File *file, PHYSFS_sint32 val);


/**
 * \fn int PHYSFS_writeULE32(PHYSFS_File *file, PHYSFS_uint32 val)
 * \brief Convert and write an unsigned 32-bit littleendian value.
 *
 * Convenience function. Convert an unsigned 32-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeULE32(PHYSFS_File *file, PHYSFS_uint32 val);


/**
 * \fn int PHYSFS_writeSBE32(PHYSFS_File *file, PHYSFS_sint32 val)
 * \brief Convert and write a signed 32-bit bigendian value.
 *
 * Convenience function. Convert a signed 32-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeSBE32(PHYSFS_File *file, PHYSFS_sint32 val);


/**
 * \fn int PHYSFS_writeUBE32(PHYSFS_File *file, PHYSFS_uint32 val)
 * \brief Convert and write an unsigned 32-bit bigendian value.
 *
 * Convenience function. Convert an unsigned 32-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 */
__EXPORT__ int PHYSFS_writeUBE32(PHYSFS_File *file, PHYSFS_uint32 val);


/**
 * \fn int PHYSFS_writeSLE64(PHYSFS_File *file, PHYSFS_sint64 val)
 * \brief Convert and write a signed 64-bit littleendian value.
 *
 * Convenience function. Convert a signed 64-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_writeSLE64(PHYSFS_File *file, PHYSFS_sint64 val);


/**
 * \fn int PHYSFS_writeULE64(PHYSFS_File *file, PHYSFS_uint64 val)
 * \brief Convert and write an unsigned 64-bit littleendian value.
 *
 * Convenience function. Convert an unsigned 64-bit value from the platform's
 *  native byte order to littleendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_writeULE64(PHYSFS_File *file, PHYSFS_uint64 val);


/**
 * \fn int PHYSFS_writeSBE64(PHYSFS_File *file, PHYSFS_sint64 val)
 * \brief Convert and write a signed 64-bit bigending value.
 *
 * Convenience function. Convert a signed 64-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_writeSBE64(PHYSFS_File *file, PHYSFS_sint64 val);


/**
 * \fn int PHYSFS_writeUBE64(PHYSFS_File *file, PHYSFS_uint64 val)
 * \brief Convert and write an unsigned 64-bit bigendian value.
 *
 * Convenience function. Convert an unsigned 64-bit value from the platform's
 *  native byte order to bigendian and write it to a file.
 *
 *    \param file PhysicsFS file handle to which to write.
 *    \param val Value to convert and write.
 *   \return zero on failure, non-zero on success. On failure, you can
 *           find out what went wrong from PHYSFS_getLastError().
 *
 * \warning Remember, PHYSFS_uint64 is only 32 bits on platforms without
 *          any sort of 64-bit support.
 */
__EXPORT__ int PHYSFS_writeUBE64(PHYSFS_File *file, PHYSFS_uint64 val);


/* Everything above this line is part of the PhysicsFS 1.0 API. */

/**
 * \fn int PHYSFS_isInit(void)
 * \brief Determine if the PhysicsFS library is initialized.
 *
 * Once PHYSFS_init() returns successfully, this will return non-zero.
 *  Before a successful PHYSFS_init() and after PHYSFS_deinit() returns
 *  successfully, this will return zero. This function is safe to call at
 *  any time.
 *
 *  \return non-zero if library is initialized, zero if library is not.
 *
 * \sa PHYSFS_init
 * \sa PHYSFS_deinit
 */
__EXPORT__ int PHYSFS_isInit(void);


/**
 * \fn int PHYSFS_symbolicLinksPermitted(void)
 * \brief Determine if the symbolic links are permitted.
 *
 * This reports the setting from the last call to PHYSFS_permitSymbolicLinks().
 *  If PHYSFS_permitSymbolicLinks() hasn't been called since the library was
 *  last initialized, symbolic links are implicitly disabled.
 *
 *  \return non-zero if symlinks are permitted, zero if not.
 *
 * \sa PHYSFS_permitSymbolicLinks
 */
__EXPORT__ int PHYSFS_symbolicLinksPermitted(void);


/**
 * \struct PHYSFS_Allocator
 * \brief PhysicsFS allocation function pointers.
 *
 * (This is for limited, hardcore use. If you don't immediately see a need
 *  for it, you can probably ignore this forever.)
 *
 * You create one of these structures for use with PHYSFS_setAllocator.
 *  Allocators are assumed to be reentrant by the caller; please mutex
 *  accordingly.
 *
 * Allocations are always discussed in 64-bits, for future expansion...we're
 *  on the cusp of a 64-bit transition, and we'll probably be allocating 6
 *  gigabytes like it's nothing sooner or later, and I don't want to change
 *  this again at that point. If you're on a 32-bit platform and have to
 *  downcast, it's okay to return NULL if the allocation is greater than
 *  4 gigabytes, since you'd have to do so anyhow.
 *
 * \sa PHYSFS_setAllocator
 */
typedef struct PHYSFS_Allocator
{
    int (*Init)(void);   /**< Initialize. Can be NULL. Zero on failure. */
    void (*Deinit)(void);  /**< Deinitialize your allocator. Can be NULL. */
    void *(*Malloc)(PHYSFS_uint64);  /**< Allocate like malloc(). */
    void *(*Realloc)(void *, PHYSFS_uint64); /**< Reallocate like realloc(). */
    void (*Free)(void *); /**< Free memory from Malloc or Realloc. */
} PHYSFS_Allocator;


/**
 * \fn int PHYSFS_setAllocator(const PHYSFS_Allocator *allocator)
 * \brief Hook your own allocation routines into PhysicsFS.
 *
 * (This is for limited, hardcore use. If you don't immediately see a need
 *  for it, you can probably ignore this forever.)
 *
 * By default, PhysicsFS will use whatever is reasonable for a platform
 *  to manage dynamic memory (usually ANSI C malloc/realloc/calloc/free, but
 *  some platforms might use something else), but in some uncommon cases, the
 *  app might want more control over the library's memory management. This
 *  lets you redirect PhysicsFS to use your own allocation routines instead.
 *  You can only call this function before PHYSFS_init(); if the library is
 *  initialized, it'll reject your efforts to change the allocator mid-stream.
 *  You may call this function after PHYSFS_deinit() if you are willing to
 *  shut down the library and restart it with a new allocator; this is a safe
 *  and supported operation. The allocator remains intact between deinit/init
 *  calls. If you want to return to the platform's default allocator, pass a
 *  NULL in here.
 *
 * If you aren't immediately sure what to do with this function, you can
 *  safely ignore it altogether.
 *
 *    \param allocator Structure containing your allocator's entry points.
 *   \return zero on failure, non-zero on success. This call only fails
 *           when used between PHYSFS_init() and PHYSFS_deinit() calls.
 */
__EXPORT__ int PHYSFS_setAllocator(const PHYSFS_Allocator *allocator);


/**
 * \fn int PHYSFS_mount(const char *newDir, const char *mountPoint, int appendToPath)
 * \brief Add an archive or directory to the search path.
 *
 * If this is a duplicate, the entry is not added again, even though the
 *  function succeeds. You may not add the same archive to two different
 *  mountpoints: duplicate checking is done against the archive and not the
 *  mountpoint.
 *
 * When you mount an archive, it is added to a virtual file system...all files
 *  in all of the archives are interpolated into a single hierachical file
 *  tree. Two archives mounted at the same place (or an archive with files
 *  overlapping another mountpoint) may have overlapping files: in such a case,
 *  the file earliest in the search path is selected, and the other files are
 *  inaccessible to the application. This allows archives to be used to
 *  override previous revisions; you can use the mounting mechanism to place
 *  archives at a specific point in the file tree and prevent overlap; this
 *  is useful for downloadable mods that might trample over application data
 *  or each other, for example.
 *
 * The mountpoint does not need to exist prior to mounting, which is different
 *  than those familiar with the Unix concept of "mounting" may not expect.
 *  As well, more than one archive can be mounted to the same mountpoint, or
 *  mountpoints and archive contents can overlap...the interpolation mechanism
 *  still functions as usual.
 *
 *   \param newDir directory or archive to add to the path, in
 *                   platform-dependent notation.
 *   \param mountPoint Location in the interpolated tree that this archive
 *                     will be "mounted", in platform-independent notation.
 *                     NULL or "" is equivalent to "/".
 *   \param appendToPath nonzero to append to search path, zero to prepend.
 *  \return nonzero if added to path, zero on failure (bogus archive, dir
 *                   missing, etc). Specifics of the error can be
 *                   gleaned from PHYSFS_getLastError().
 *
 * \sa PHYSFS_removeFromSearchPath
 * \sa PHYSFS_getSearchPath
 * \sa PHYSFS_getMountPoint
 */
__EXPORT__ int PHYSFS_mount(const char *newDir, const char *mountPoint, int appendToPath);

/**
 * \fn int PHYSFS_getMountPoint(const char *dir)
 * \brief Determine a mounted archive's mountpoint.
 *
 * You give this function the name of an archive or dir you successfully
 *  added to the search path, and it reports the location in the interpolated
 *  tree where it is mounted. Files mounted with a NULL mountpoint or through
 *  PHYSFS_addToSearchPath() will report "/". The return value is READ ONLY
 *  and valid until the archive is removed from the search path.
 *
 *   \param dir directory or archive previously added to the path, in
 *              platform-dependent notation. This must match the string
 *              used when adding, even if your string would also reference
 *              the same file with a different string of characters.
 *  \return READ-ONLY string of mount point if added to path, NULL on failure
 *          (bogus archive, etc) Specifics of the error can be gleaned from
 *          PHYSFS_getLastError().
 *
 * \sa PHYSFS_removeFromSearchPath
 * \sa PHYSFS_getSearchPath
 * \sa PHYSFS_getMountPoint
 */
__EXPORT__ const char *PHYSFS_getMountPoint(const char *dir);


/**
 * \typedef PHYSFS_StringCallback
 * \brief Function signature for callbacks that report strings.
 *
 * These are used to report a list of strings to an original caller, one
 *  string per callback. All strings are UTF-8 encoded. Functions should not
 *  try to modify or free the string's memory.
 *
 * These callbacks are used, starting in PhysicsFS 1.1, as an alternative to
 *  functions that would return lists that need to be cleaned up with
 *  PHYSFS_freeList(). The callback means that the library doesn't need to
 *  allocate an entire list and all the strings up front.
 *
 * Be aware that promises data ordering in the list versions are not
 *  necessarily so in the callback versions. Check the documentation on
 *  specific APIs, but strings may not be sorted as you expect.
 *
 *    \param data User-defined data pointer, passed through from the API
 *                that eventually called the callback.
 *    \param str The string data about which the callback is meant to inform.
 *
 * \sa PHYSFS_getCdRomDirsCallback
 * \sa PHYSFS_getSearchPathCallback
 */
typedef void (*PHYSFS_StringCallback)(void *data, const char *str);


/**
 * \typedef PHYSFS_EnumFilesCallback
 * \brief Function signature for callbacks that enumerate files.
 *
 * These are used to report a list of directory entries to an original caller,
 *  one file/dir/symlink per callback. All strings are UTF-8 encoded.
 *  Functions should not try to modify or free any string's memory.
 *
 * These callbacks are used, starting in PhysicsFS 1.1, as an alternative to
 *  functions that would return lists that need to be cleaned up with
 *  PHYSFS_freeList(). The callback means that the library doesn't need to
 *  allocate an entire list and all the strings up front.
 *
 * Be aware that promises data ordering in the list versions are not
 *  necessarily so in the callback versions. Check the documentation on
 *  specific APIs, but strings may not be sorted as you expect.
 *
 *    \param data User-defined data pointer, passed through from the API
 *                that eventually called the callback.
 *    \param origdir A string containing the full path, in platform-independent
 *                   notation, of the directory containing this file. In most
 *                   cases, this is the directory on which you requested
 *                   enumeration, passed in the callback for your convenience.
 *    \param fname The filename that is being enumerated. It may not be in
 *                 alphabetical order compared to other callbacks that have
 *                 fired, and it will not contain the full path. You can
 *                 recreate the fullpath with $origdir/$fname ... The file
 *                 can be a subdirectory, a file, a symlink, etc.
 *
 * \sa PHYSFS_enumerateFilesCallback
 */
typedef void (*PHYSFS_EnumFilesCallback)(void *data, const char *origdir,
                                         const char *fname);


/**
 * \fn void PHYSFS_getCdRomDirsCallback(PHYSFS_StringCallback c, void *d)
 * \brief Enumerate CD-ROM directories, using an application-defined callback.
 *
 * Internally, PHYSFS_getCdRomDirs() just calls this function and then builds
 *  a list before returning to the application, so functionality is identical
 *  except for how the information is represented to the application.
 *
 * Unlike PHYSFS_getCdRomDirs(), this function does not return an array.
 *  Rather, it calls a function specified by the application once per
 *  detected disc:
 *
 * \code
 *
 * static void foundDisc(void *data, const char *cddir)
 * {
 *     printf("cdrom dir [%s] is available.\n", cddir);
 * }
 *
 * // ...
 * PHYSFS_getCdRomDirsCallback(foundDisc, NULL);
 * \endcode
 *
 * This call may block while drives spin up. Be forewarned.
 *
 *    \param c Callback function to notify about detected drives.
 *    \param d Application-defined data passed to callback. Can be NULL.
 *
 * \sa PHYSFS_StringCallback
 * \sa PHYSFS_getCdRomDirs
 */
__EXPORT__ void PHYSFS_getCdRomDirsCallback(PHYSFS_StringCallback c, void *d);


/**
 * \fn void PHYSFS_getSearchPathCallback(PHYSFS_StringCallback c, void *d)
 * \brief Enumerate the search path, using an application-defined callback.
 *
 * Internally, PHYSFS_getSearchPath() just calls this function and then builds
 *  a list before returning to the application, so functionality is identical
 *  except for how the information is represented to the application.
 *
 * Unlike PHYSFS_getSearchPath(), this function does not return an array.
 *  Rather, it calls a function specified by the application once per
 *  element of the search path:
 *
 * \code
 *
 * static void printSearchPath(void *data, const char *pathItem)
 * {
 *     printf("[%s] is in the search path.\n", pathItem);
 * }
 *
 * // ...
 * PHYSFS_getSearchPathCallback(printSearchPath, NULL);
 * \endcode
 *
 * Elements of the search path are reported in order search priority, so the
 *  first archive/dir that would be examined when looking for a file is the
 *  first element passed through the callback.
 *
 *    \param c Callback function to notify about search path elements.
 *    \param d Application-defined data passed to callback. Can be NULL.
 *
 * \sa PHYSFS_StringCallback
 * \sa PHYSFS_getSearchPath
 */
__EXPORT__ void PHYSFS_getSearchPathCallback(PHYSFS_StringCallback c, void *d);


/**
 * \fn void PHYSFS_enumerateFilesCallback(const char *dir, PHYSFS_EnumFilesCallback c, void *d)
 * \brief Get a file listing of a search path's directory, using an application-defined callback.
 *
 * Internally, PHYSFS_enumerateFiles() just calls this function and then builds
 *  a list before returning to the application, so functionality is identical
 *  except for how the information is represented to the application.
 *
 * Unlike PHYSFS_enumerateFiles(), this function does not return an array.
 *  Rather, it calls a function specified by the application once per
 *  element of the search path:
 *
 * \code
 *
 * static void printDir(void *data, const char *origdir, const char *fname)
 * {
 *     printf(" * We've got [%s] in [%s].\n", fname, origdir);
 * }
 *
 * // ...
 * PHYSFS_enumerateFilesCallback("/some/path", printDir, NULL);
 * \endcode
 *
 * Items sent to the callback are not guaranteed to be in any order whatsoever.
 *  There is no sorting done at this level, and if you need that, you should
 *  probably use PHYSFS_enumerateFiles() instead, which guarantees
 *  alphabetical sorting. This form reports whatever is discovered in each
 *  archive before moving on to the next. Even within one archive, we can't
 *  guarantee what order it will discover data. <em>Any sorting you find in
 *  these callbacks is just pure luck. Do not rely on it.</em>
 *
 *    \param dir Directory, in platform-independent notation, to enumerate.
 *    \param c Callback function to notify about search path elements.
 *    \param d Application-defined data passed to callback. Can be NULL.
 *
 * \sa PHYSFS_EnumFilesCallback
 * \sa PHYSFS_enumerateFiles
 */
__EXPORT__ void PHYSFS_enumerateFilesCallback(const char *dir,
                                              PHYSFS_EnumFilesCallback c,
                                              void *d);

/**
 * \fn void PHYSFS_utf8FromUcs4(const PHYSFS_uint32 *src, char *dst, PHYSFS_uint64 len)
 * \brief Convert a UCS-4 string to a UTF-8 string.
 *
 * UCS-4 strings are 32-bits per character: \c wchar_t on Unix.
 *
 * To ensure that the destination buffer is large enough for the conversion,
 *  please allocate a buffer that is the same size as the source buffer. UTF-8
 *  never uses more than 32-bits per character, so while it may shrink a UCS-4
 *  string, it will never expand it.
 *
 * Strings that don't fit in the destination buffer will be truncated, but
 *  will always be null-terminated and never have an incomplete UTF-8
 *  sequence at the end.
 *
 *   \param src Null-terminated source string in UCS-4 format.
 *   \param dst Buffer to store converted UTF-8 string.
 *   \param len Size, in bytes, of destination buffer.
 */
__EXPORT__ void PHYSFS_utf8FromUcs4(const PHYSFS_uint32 *src, char *dst,
                                    PHYSFS_uint64 len);

/**
 * \fn void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
 * \brief Convert a UTF-8 string to a UCS-4 string.
 *
 * UCS-4 strings are 32-bits per character: \c wchar_t on Unix.
 *
 * To ensure that the destination buffer is large enough for the conversion,
 *  please allocate a buffer that is four times the size of the source buffer.
 *  UTF-8 uses from one to four bytes per character, but UCS-4 always uses
 *  four, so an entirely low-ASCII string will quadruple in size!
 *
 * Strings that don't fit in the destination buffer will be truncated, but
 *  will always be null-terminated and never have an incomplete UCS-4
 *  sequence at the end.
 *
 *   \param src Null-terminated source string in UTF-8 format.
 *   \param dst Buffer to store converted UCS-4 string.
 *   \param len Size, in bytes, of destination buffer.
 */
__EXPORT__ void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst,
                                  PHYSFS_uint64 len);

/**
 * \fn void PHYSFS_utf8FromUcs2(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
 * \brief Convert a UCS-2 string to a UTF-8 string.
 *
 * UCS-2 strings are 16-bits per character: \c TCHAR on Windows, when building
 *  with Unicode support.
 *
 * To ensure that the destination buffer is large enough for the conversion,
 *  please allocate a buffer that is double the size of the source buffer.
 *  UTF-8 never uses more than 32-bits per character, so while it may shrink
 *  a UCS-2 string, it may also expand it.
 *
 * Strings that don't fit in the destination buffer will be truncated, but
 *  will always be null-terminated and never have an incomplete UTF-8
 *  sequence at the end.
 *
 * Please note that UCS-2 is not UTF-16; we do not support the "surrogate"
 *  values at this time.
 *
 *   \param src Null-terminated source string in UCS-2 format.
 *   \param dst Buffer to store converted UTF-8 string.
 *   \param len Size, in bytes, of destination buffer.
 */
__EXPORT__ void PHYSFS_utf8FromUcs2(const PHYSFS_uint16 *src, char *dst,
                                    PHYSFS_uint64 len);

/**
 * \fn PHYSFS_utf8ToUcs2(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
 * \brief Convert a UTF-8 string to a UCS-2 string.
 *
 * UCS-2 strings are 16-bits per character: \c TCHAR on Windows, when building
 *  with Unicode support.
 *
 * To ensure that the destination buffer is large enough for the conversion,
 *  please allocate a buffer that is double the size of the source buffer.
 *  UTF-8 uses from one to four bytes per character, but UCS-2 always uses
 *  two, so an entirely low-ASCII string will double in size!
 *
 * Strings that don't fit in the destination buffer will be truncated, but
 *  will always be null-terminated and never have an incomplete UCS-2
 *  sequence at the end.
 *
 * Please note that UCS-2 is not UTF-16; we do not support the "surrogate"
 *  values at this time.
 *
 *   \param src Null-terminated source string in UTF-8 format.
 *   \param dst Buffer to store converted UCS-2 string.
 *   \param len Size, in bytes, of destination buffer.
 */
__EXPORT__ void PHYSFS_utf8ToUcs2(const char *src, PHYSFS_uint16 *dst,
                                  PHYSFS_uint64 len);

/**
 * \fn void PHYSFS_utf8FromLatin1(const char *src, char *dst, PHYSFS_uint64 len)
 * \brief Convert a UTF-8 string to a Latin1 string.
 *
 * Latin1 strings are 8-bits per character: a popular "high ASCII"
 *  encoding.
 *
 * To ensure that the destination buffer is large enough for the conversion,
 *  please allocate a buffer that is double the size of the source buffer.
 *  UTF-8 expands latin1 codepoints over 127 from 1 to 2 bytes, so the string
 *  may grow in some cases.
 *
 * Strings that don't fit in the destination buffer will be truncated, but
 *  will always be null-terminated and never have an incomplete UTF-8
 *  sequence at the end.
 *
 * Please note that we do not supply a UTF-8 to Latin1 converter, since Latin1
 *  can't express most Unicode codepoints. It's a legacy encoding; you should
 *  be converting away from it at all times.
 *
 *   \param src Null-terminated source string in Latin1 format.
 *   \param dst Buffer to store converted UTF-8 string.
 *   \param len Size, in bytes, of destination buffer.
 */
__EXPORT__ void PHYSFS_utf8FromLatin1(const char *src, char *dst,
                                  PHYSFS_uint64 len);

/* Everything above this line is part of the PhysicsFS 2.0 API. */


#ifdef __cplusplus
}
#endif

#endif  /* !defined _INCLUDE_PHYSFS_H_ */

/* end of physfs.h ... */

