physfs.h
author Ryan C. Gordon <icculus@icculus.org>
Thu, 07 Jun 2001 05:48:42 +0000
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/**
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 * PhysicsFS; a portable, flexible file i/o abstraction.
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 *
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 * This API gives you access to a system file system in ways superior to the
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 *  stdio or system i/o calls. The brief benefits:
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 *
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 *   - It's portable.
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 *   - It's safe. No file access is permitted outside the specified dirs.
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 *   - It can handle byte ordering on alternative processors.
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 *   - It's flexible. Archives (.ZIP files) can be used transparently as
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 *      directory structures.
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 *
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 * This system is largely inspired by Quake 3's PK3 files and the related
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 *  fs_* cvars. If you've ever tinkered with these, then this API will be
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 *  familiar to you.
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 *
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 * With PhysicsFS, you have a single writing path and multiple "search paths"
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 *  for reading. You can think of this as a filesystem within a
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 *  filesystem. If (on Windows) you were to set the writing directory to
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 *  "C:\MyGame\MyWritingDirectory", then no PHYSFS calls could touch anything
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 *  above this directory, including the "C:\MyGame" and "C:\" directories.
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 *  This prevents an application's internal scripting language from piddling
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 *  over c:\config.sys, for example. If you'd rather give PHYSFS full access
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 *  to the system's REAL file system, set the writing path to "C:\", but
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 *  that's generally A Bad Thing for several reasons.
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 *
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 * Drive letters are hidden in PhysicsFS once you set up your initial paths.
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 *  The search paths create a single, hierarchical directory structure.
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 *  Not only does this lend itself well to general abstraction with archives,
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 *  it also gives better support to operating systems like MacOS and Unix.
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 *  Generally speaking, you shouldn't ever hardcode a drive letter; not only
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 *  does this hurt portability to non-Microsoft OSes, but it limits your win32
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 *  users to a single drive, too. Use the PhysicsFS abstraction functions and
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 *  allow user-defined configuration options, too. When opening a file, you
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 *  specify it like it was on a Unix filesystem: if you want to write to
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 *  "C:\MyGame\MyConfigFiles\game.cfg", then you might set the write path to
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 *  "C:\MyGame" and then open "MyConfigFiles/game.cfg". This gives an
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 *  abstraction across all platforms. Specifying a file in this way is termed
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 *  "platform-independent notation" in this documentation. Specifying a path
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 *  as "C:\mydir\myfile" or "MacOS hard drive:My Directory:My File" is termed
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 *  "platform-dependent notation". The only time you use platform-dependent
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 *  notation is when setting up your write and search paths; after that, all
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 *  file access into those paths are done with platform-independent notation.
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 *
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 * All files opened for writing are opened in relation to the write path,
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 *  which is the root of the writable filesystem. When opening a file for
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 *  reading, PhysicsFS goes through it's internal search path. This is NOT the
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 *  same thing as the PATH environment variable. An application using
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 *  PhysicsFS specifies directories to be searched which may be actual
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 *  directories, or archive files that contain files and subdirectories of
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 *  their own. See the end of these docs for currently supported archive
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 *  formats.
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 *
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 * Once a search path is defined, you may open files for reading. If you've
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 *  got the following search path defined (to use a win32 example again):
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 *
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 *    C:\mygame
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 *    C:\mygame\myuserfiles
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 *    D:\mygamescdromdatafiles
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 *    C:\mygame\installeddatafiles.zip
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 *
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 * Then a call to PHYSFS_openread("textfiles/myfile.txt") (note the directory
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 *  separator, lack of drive letter, and lack of dir separator at the start of
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 *  the string; this is platform-independent notation) will check for
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 *  C:\mygame\textfiles\myfile.txt, then
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 *  C:\mygame\myuserfiles\textfiles\myfile.txt, then
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 *  D:\mygamescdromdatafiles\textfiles\myfile.txt, then, finally, for
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 *  textfiles\myfile.txt inside of C:\mygame\installeddatafiles.zip. Remember
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 *  that most archive types and platform filesystems store their filenames in
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 *  a case-sensitive manner, so you should be careful to specify it correctly.
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 *
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 * Files opened through PhysicsFS may NOT contain "." or ".." as path
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 *  elements. Not only are these meaningless on MacOS, they are a security
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 *  hole. Also, symbolic links (which can be found in some archive types and
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 *  directly in the filesystem on Unix platforms) are NOT followed until you
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 *  call PHYSFS_permitSymbolicLinks(). That's left to your own discretion, as
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 *  following a symlink can allow for access outside the write and search
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 *  paths. There is no mechanism for creating new symlinks in PhysicsFS.
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 *
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 * The write path is not included in the search path unless you specifically
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 *  add it. While you CAN change the write path as many times as you like,
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 *  you should probably set it once and stick to that path.
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 *
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 * All files are opened in binary mode; there is no endline conversion for
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 *  textfiles. Other than that, PhysicsFS has some convenience functions for
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 *  platform-independence. There are functions that give you the current
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 *  platform's path separator ("\\" on windows, "/" on Unix, ":" on MacOS),
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 *  which is needed only to set up your search/write paths. There are
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 *  functions to tell you what CD-ROM drives contain accessible discs, and
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 *  functions to recommend good search paths, etc. There are also functions
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 *  to read 16 and 32 bit numbers from files and convert them to the native
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 *  byte order of your processor.
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 *
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 * A recommended order for a search path is the write path, then the base path,
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 *  then the cdrom path, then any archives discovered. Quake 3 does something
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 *  like this, but moves the archives to the start of the search path. There
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 *  is a helper function (PHYSFS_setSanePaths()) that does this for you,
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 *  based on a few parameters. Also see the comments on PHYSFS_getBasePath(),
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 *  and PHYSFS_getUserPath() for info on what those are and how they can help
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 *  you determine an optimal searchpath.
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 *
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 * While you CAN mix stdio/syscall file access with PHYSFS_* calls in a
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 *  program, doing so is not recommended, and you can not use system
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 *  filehandles with PhysicsFS filehandles and vice versa.
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 *
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 * Note that archives need not be named as such: if you have a ZIP file and
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 *  rename it with a .PKG extention, the file will still be recognized as a
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 *  ZIP archive by PhysicsFS; the file's contents are used to determine its
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 *  type.
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 *
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 * Currently supported archive types:
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 *   - .ZIP (pkZip/WinZip/Info-ZIP compatible)
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 *
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 * Please see the file LICENSE in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#ifndef _INCLUDE_PHYSFS_H_
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#define _INCLUDE_PHYSFS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* functions... */
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/**
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 * Initialize PhysicsFS. This must be called before any other PhysicsFS
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 *  function (except PHYSFS_getLastError()).
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 *
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 *   @param argv0 the argv[0] string passed to your program's mainline.
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 *  @return nonzero on success, zero on error. Specifics of the error can be
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 *          gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_init(const char *argv0);
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/**
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 * Shutdown PhysicsFS. This closes any files opened via PhysicsFS, blanks the
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 *  search/write paths, frees memory, and invalidates all your handles.
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 *
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 * Once deinitialized, PHYSFS_init() can be called again to restart the
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 *  subsystem.
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 *
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 *  @return nonzero on success, zero on error. Specifics of the error can be
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 *          gleaned from PHYSFS_getLastError(). If failure, state of PhysFS is
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 *          undefined, and probably badly screwed up.
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 */
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void PHYSFS_deinit(void);
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/**
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 * Get the last PhysicsFS error message as a null-terminated string.
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 *  This will be NULL if there's been no error since the last call to this
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 *  function. The pointer returned by this call points to a static
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 *  internal buffer, and this call is not thread safe.
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 *
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 *   @return READ ONLY string of last error message.
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 */
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const char *PHYSFS_getLastError(void);
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/**
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 * Get a platform-dependent path separator. This is "\\" on win32, "/" on Unix,
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 *  and ":" on MacOS. It may be more than one character, depending on the
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 *  platform, and your code should take that into account. Note that this is
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 *  only useful for setting up the search/write paths, since access into those
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 *  paths always use '/' (platform-independent notation) to separate
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 *  directories. This is also handy for getting platform-independent access
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 *  when using stdio calls.
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 *
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 *   @return READ ONLY null-terminated string of platform's path separator.
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 */
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const char *PHYSFS_getPathSeparator(void);
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/**
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 * Get an array of paths to available CD-ROM drives. This return value should
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 *  be considered READ ONLY and points to an internal buffer which may change
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 *  with each call to this function. This means that this function is NOT
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 *  thread safe.
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 *
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 * The paths returned are platform-dependent ("D:\" on Win32, "/cdrom" or
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 *  whatnot on Unix). Paths are only returned if there is a disc ready and
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 *  accessible in the drive. So if you've got two drives (D: and E:), and only
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 *  E: has a disc in it, then that's all you get. If the user inserts a disc
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 *  in D: and you call this function again, you get both drives. If, on a
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 *  Unix box, the user unmounts a disc and remounts it elsewhere, the next
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 *  call to this function will reflect that change. Fun.
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 *
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 * The returned value is an array of strings, with a NULL entry to signify the
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 *  end of the list:
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 *
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 * char **i;
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 *
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 * // lock thread here, if needed.
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 *
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 * for (i = PHYSFS_getCdRomPaths(); *i != NULL; i++)
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 *     printf("cdrom path [%s] is available.\n", *i);
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 *
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 * // unlock thread here, if needed.
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 *
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 * This call may block while drives spin up. Be forewarned.
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 *
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 *   @return READ ONLY null-term'd array of READ ONLY null-terminated strings.
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 */
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const char **PHYSFS_getCdRomPaths(void);
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/**
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 * Helper function.
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 *
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 * Get the "base path". This is the directory where the application was run
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 *  from, which is probably the installation directory.
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 *
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 * You should probably use the base path in your search path.
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 *
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 *   @param buffer pointer to buffer to fill with recommended path.
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 *   @param bufsize size of buffer pointed to by (buffer).
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 *  @return a copy of (buffer), for easy use as another function's parameter.
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 */
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char *PHYSFS_getBasePath(char *buffer, int bufferSize);
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/**
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 * Helper function.
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 *
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 * Get the "user path". This is meant to be a suggestion of where a specific
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 *  user of the system can store files. On Unix, this is her home directory.
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 *  On systems with no concept of multiple users (MacOS, win95), this will
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 *  default to the "base path" returned by PHYSFS_getBasePath().
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 *
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 * You should probably use the user path as the basis for your write path, and
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 *  also put it near the beginning of your search path.
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 *
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 *   @param buffer pointer to buffer to fill with recommended path.
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 *   @param bufsize size of buffer pointed to by (buffer).
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 *  @return a copy of (buffer), for easy use as another function's parameter.
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 */
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char *PHYSFS_getUserPath(char *buffer, int bufferSize);
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/**
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 * Get the current write path. The default write path is NULL.
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 *
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 *   @param buffer pointer to buffer to fill with recommended path.
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 *   @param bufsize size of buffer pointed to by (buffer).
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 *  @return a copy of (buffer), for easy use as another function's parameter,
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 *           OR NULL IF NO WRITE PATH IS CURRENTLY SET.
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 */
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char *PHYSFS_getWritePath(char *buffer, int bufferSize);
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/**
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 * Set a new write path. This will override the previous setting. If the
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 *  directory or a parent directory doesn't exist in the physical filesystem,
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 *  PhysicsFS will attempt to create them as needed.
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 *
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 * This call will fail (and fail to change the write path) if the current path
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 *  still has files open in it.
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 *
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 *   @param newPath The new directory to be the root of the write path,
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 *                   specified in a platform-dependent manner. Setting to NULL
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 *                   disables the write path, so no files can be opened for
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 *                   writing via PhysicsFS.
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 *  @return non-zero on success, zero on failure. All attempts to open a file
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 *           for writing via PhysicsFS will fail until this call succeeds.
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 *           Specifics of the error can be gleaned from PHYSFS_getLastError().
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 *
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 */
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int PHYSFS_setWritePath(const char *newPath);
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/**
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 * Add a directory or archive to the search path. If this is a duplicate, the
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 *  entry is not added again, even though the function succeeds.
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 *
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 *   @param newPath directory or archive to add to the path, in
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 *                   platform-dependent notation.
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 *   @param appendToPath nonzero to append to search path, zero to prepend.
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 *  @return nonzero if added to path, zero on failure (bogus archive, path
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 *                   missing, etc). Specifics of the error can be
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 *                   gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_addToSearchPath(const char *newPath, int appendToPath);
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/**
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 * Remove a directory or archive from the search path.
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 *
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 * This must be a (case-sensitive) match to a dir or archive already in the
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 *  search path, specified in platform-dependent notation.
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 *
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 * This call will fail (and fail to remove from the path) if the element still
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 *  has files open in it.
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 *
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 *    @param oldPath dir/archive to remove.
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 *   @return nonzero on success, zero on failure.
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 *            Specifics of the error can be gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_removeFromSearchPath(const char *oldPath);
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/**
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 * Get the current search path. The default search path is an empty list.
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 *
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 * This return value should be considered READ ONLY and points to an internal
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 *  buffer which may change with each call to this function. This means that
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 *  this function is NOT thread safe.
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 *
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 * The returned value is an array of strings, with a NULL entry to signify the
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 *  end of the list:
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 *
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 * char **i;
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 *
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 * // lock thread here, if needed.
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 *
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 * for (i = PHYSFS_getSearchPath(); *i != NULL; i++)
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 *     printf("[%s] is in the search path.\n", *i);
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 *
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 * // unlock thread here, if needed.
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 *
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 *   @return READ ONLY null-term'd array of READ ONLY null-terminated strings.
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 */
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const char **PHYSFS_getSearchPath(void);
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/**
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 * Helper function.
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 *
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 * Set up sane, default paths. The write path will be set to
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 *  "userpath/.appName", which is created if it doesn't exist.
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 *
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 * The above is sufficient to make sure your program's configuration directory
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 *  is separated from other clutter, and platform-independent. The period
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 *  before "mygame" even hides the directory on Unix systems.
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 *
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 *  The search path will be:
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 *
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 *    - The Write Path (created if it doesn't exist)
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 *    - The Write Path/appName (created if it doesn't exist)
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 *    - The Base Path (PHYSFS_getBasePath())
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 *    - The Base Path/appName (if it exists)
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 *    - All found CD-ROM paths (optionally)
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 *    - All found CD-ROM paths/appName (optionally, and if they exist)
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 *
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 * These directories are then searched for files ending with the extension
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 *  (archiveExt), which, if they are valid and supported archives, will also
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 *  be added to the search path. If you specified "PKG" for (archiveExt), and
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 *  there's a file named data.PKG in the base dir, it'll be checked. Archives
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 *  can either be appended or prepended to the search path in alphabetical
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 *  order, regardless of which directories they were found in.
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 *
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 * All of this can be accomplished from the application, but this just does it
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 *  all for you. Feel free to add more to the search path manually, too.
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 *
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 *    @param appName Program-specific name of your program, to separate it
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 *                   from other programs using PhysicsFS.
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 *
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 *    @param archiveExt File extention used by your program to specify an
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 *                      archive. For example, Quake 3 uses "pk3", even though
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 *                      they are just zipfiles. Specify NULL to not dig out
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 *                      archives automatically.
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 *
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 *    @param includeCdRoms Non-zero to include CD-ROMs in the search path, and
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 *                         (if (archiveExt) != NULL) search them for archives.
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 *                         This may cause a significant amount of blocking
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 *                         while discs are accessed, and if there are no discs
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 *                         in the drive (or even not mounted on Unix systems),
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 *                         then they may not be made available anyhow. You may
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 *                         want to specify zero and handle the disc setup
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 *                         yourself.
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 *
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 *    @param archivesFirst Non-zero to prepend the archives to the search path.
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 *                          Zero to append them. Ignored if !(archiveExt).
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 */
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void PHYSFS_setSanePaths(const char *appName, const char *archiveExt,
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                         int includeCdRoms, int archivesFirst);
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/**
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 * Create a directory. This is specified in platform-independent notation in
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 *  relation to the write path. All missing parent directories are also
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 *  created if they don't exist.
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 *
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 * So if you've got the write path set to "C:\mygame\writepath" and call
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 *  PHYSFS_mkdir("downloads/maps") then the directories
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 *  "C:\mygame\writepath\downloads" and "C:\mygame\writepath\downloads\maps"
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 *  will be created if possible.
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 *
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 *   @param dirname New path to create.
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 *  @return nonzero on success, zero on error. Specifics of the error can be
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 *          gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_mkdir(const char *dirName);
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/**
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 * Delete a file or directory. This is specified in platform-independent
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 *  notation in relation to the write path.
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 *
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 * A directory must be empty before this call can delete it. If you need to
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 *  nuke a whole directory tree, use PHYSFS_deltree()...with care.
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 *
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 * So if you've got the write path set to "C:\mygame\writepath" and call
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 *  PHYSFS_delete("downloads/maps/level1.map") then the file
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 *  "C:\mygame\writepath\downloads\maps\level1.map" is removed from the
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 *  physical filesystem, if it exists and the operating system permits the
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 *  deletion.
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 *
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 * Note that on Unix systems, deleting a file may be successful, but the
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 *  actual file won't be removed until all processes that have an open
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 *  filehandle to it (including your program) close their handles.
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 *
1
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 *   @param filename Filename to delete.
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 *  @return nonzero on success, zero on error. Specifics of the error can be
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 *          gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_delete(const char *filename);
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/**
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 * Delete a directory tree. This is specified in platform-independent
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 *  notation in relation to the write path.
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   427
 *
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 * Be CAREFUL with this function; it will take out EVERYTHING under the
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 *  specified directory with extreme prejudice.
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 *
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 * If you specify a filename that is not a directory, PhysicsFS will attempt
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 *  to delete that single file.
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 *
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 * So if you've got the write path set to "C:\mygame\writepath" and call
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 *  PHYSFS_deltree("downloads/maps") then the directory
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 *  "C:\mygame\writepath\downloads\maps" and everything in it (including child
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 *  directories) is removed from the physical filesystem, if it exists and the
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 *  operating system permits the deletion.
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 *
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 * Note that on Unix systems, deleting a file may be successful, but the
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   441
 *  actual file won't be removed until all processes that have an open
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   442
 *  filehandle to it (including your program) close their handles.
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   443
 *
1
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   444
 *   @param filename root of directory tree to delete.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   445
 *  @return nonzero on success, zero on error. Specifics of the error can be
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   446
 *          gleaned from PHYSFS_getLastError().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   447
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   448
int PHYSFS_deltree(const char *filename);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   449
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   450
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   451
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   452
 * Enable symbolic links. Some physical filesystems and archives contain
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   453
 *  files that are just pointers to other files. On the physical filesystem,
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   454
 *  opening such a link will (transparently) open the file that is pointed to.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   455
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   456
 * By default, PhysicsFS will check if a file is really a symlink during open
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   457
 *  calls and fail if it is. Otherwise, the link could take you outside the
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   458
 *  write and search paths, and compromise security.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   459
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   460
 * If you want to take that risk, call this function with a non-zero parameter.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   461
 *  Note that this is more for sandboxing a program's scripting language, in
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   462
 *  case untrusted scripts try to compromise the system. Generally speaking,
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   463
 *  a user could very well have a legitimate reason to set up a symlink, so
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   464
 *  unless you feel there's a specific danger in allowing them, you should
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   465
 *  permit them.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   466
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   467
 * Symbolic link permission can be enabled or disabled at any time, and is
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   468
 *  disabled by default.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   469
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   470
 *   @param allow nonzero to permit symlinks, zero to deny linking.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   471
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   472
void PHYSFS_permitSymbolicLinks(int allow);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   473
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   474
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   475
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   476
 * Determine if a file exists. Just because it exists does NOT mean that you
2
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   477
 *  will have access to read or write it, or that it will continue to exist
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   478
 *  after this call (as other processes may delete it on multitasking systems).
1
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   479
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   480
 *   @param filename a file in platform-independent notation.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   481
 *   @param inWritePath nonzero to check write path, zero to check search path.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   482
 *  @return nonzero if exists, zero otherwise.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   483
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   484
int PHYSFS_exists(const char *filename, int inWritePath);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   485
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   486
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   487
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   488
 * Figure out where in the search path a file resides. The file is specified
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   489
 *  in platform-independent notation. The returned filename will be the
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   490
 *  element of the search path where the file was found, which may be a
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   491
 *  directory, or an archive. Even if there are multiple matches in different
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   492
 *  parts of the search path, only the first one found is used, just like
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   493
 *  when opening a file.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   494
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   495
 * So, if you look for "maps/level1.map", and C:\mygame is in your search
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   496
 *  path and C:\mygame\maps\level1.map exists, then buffer will be filled in
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   497
 *  with "C:\mygame\maps\level1.map" and the function returns nonzero.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   498
 *
2
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   499
 * If a match is a symbolic link, and you've not explicitly permitted symlinks,
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   500
 *  then it will be ignored, and the search for a match will continue.
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
Ryan C. Gordon <icculus@icculus.org>
parents: 1
diff changeset
   501
 *
1
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   502
 *     @param buffer pointer to buffer to fill with path.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   503
 *     @param bufsize size of buffer pointed to by (buffer).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   504
 *     @param filename file to look for.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   505
 *    @return nonzero if file was found, zero otherwise. If found, (buffer)
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   506
 *             will be filled in.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   507
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   508
int PHYSFS_getRealPath(const char *filename, char *buffer, int bufSize);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   509
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   510
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   511
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   512
 * Open a file for writing, in platform-independent notation and in relation
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   513
 *  to the write path as the root of the writable filesystem. The specified
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   514
 *  file is created if it doesn't exist. If it does exist, it is truncated to
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   515
 *  zero bytes, and the writing offset is set to the start.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   516
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   517
 *   @param filename File to open.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   518
 *  @return A valid PhysicsFS filehandle on success, NULL on error. Specifics
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   519
 *           of the error can be gleaned from PHYSFS_getLastError().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   520
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   521
void *PHYSFS_openWrite(const char *filename);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   522
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   523
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   524
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   525
 * Open a file for writing, in platform-independent notation and in relation
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   526
 *  to the write path as the root of the writable filesystem. The specified
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   527
 *  file is created if it doesn't exist. If it does exist, the writing offset
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   528
 *  is set to the end of the file, so the first write will be the byte after
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   529
 *  the end.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   530
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   531
 *   @param filename File to open.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   532
 *  @return A valid PhysicsFS filehandle on success, NULL on error. Specifics
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   533
 *           of the error can be gleaned from PHYSFS_getLastError().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   534
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   535
void *PHYSFS_openAppend(const char *filename);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   536
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   537
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   538
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   539
 * Open a file for reading, in platform-independent notation. The search path
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   540
 *  is checked one at a time until a matching file is found, in which case an
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   541
 *  abstract filehandle is associated with it, and reading may be done.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   542
 *  The reading offset is set to the first byte of the file.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   543
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   544
 *   @param filename File to open.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   545
 *  @return A valid PhysicsFS filehandle on success, NULL on error. Specifics
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   546
 *           of the error can be gleaned from PHYSFS_getLastError().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   547
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   548
void *PHYSFS_openRead(const char *filename);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   549
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   550
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   551
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   552
 * Close a PhysicsFS filehandle. This call is capable of failing if the
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   553
 *  operating system was buffering writes to this file, and (now forced to
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   554
 *  write those changes to physical media) can not store the data for any
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   555
 *  reason. In such a case, the filehandle stays open. A well-written program
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   556
 *  should ALWAYS check the return value from the close call in addition to
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   557
 *  every writing call!
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   558
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   559
 *   @param handle handle returned from PHYSFS_open*().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   560
 *  @return nonzero on success, zero on error. Specifics of the error can be
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   561
 *          gleaned from PHYSFS_getLastError().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   562
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   563
int PHYSFS_close(void *handle);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   564
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   565
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   566
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   567
 * Read data from a PhysicsFS filehandle. The file must be opened for reading.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   568
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   569
 *   @param handle handle returned from PHYSFS_openRead().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   570
 *   @param buffer buffer to store read data into.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   571
 *   @param objSize size in bytes of objects being read from (handle).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   572
 *   @param objCount number of (objSize) objects to read from (handle).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   573
 *  @return number of objects read. PHYSFS_getLastError() can shed light on
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   574
 *           the reason this might be < (objCount).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   575
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   576
int PHYSFS_read(void *handle, void *buffer, int objSize, int objCount);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   577
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   578
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   579
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   580
 * Write data to a PhysicsFS filehandle. The file must be opened for writing.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   581
 *
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   582
 *   @param handle retval from PHYSFS_openWrite() or PHYSFS_openAppend().
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   583
 *   @param buffer buffer to store read data into.
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   584
 *   @param objSize size in bytes of objects being read from (handle).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   585
 *   @param objCount number of (objSize) objects to read from (handle).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   586
 *  @return number of objects read. PHYSFS_getLastError() can shed light on
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   587
 *           the reason this might be < (objCount).
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   588
 */
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   589
int PHYSFS_write(void *handle, void *buffer, int objSize, int objCount);
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   590
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   591
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   592
/**
b5ce9d35fdb4 Initial revision
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
   593
 * Determine if the end of file has been reached in a PhysicsFS filehandle.
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   594
 *
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 *   @param handle handle returned from PHYSFS_openRead().
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 *  @return nonzero if EOF, zero if not.
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 */
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   598
int PHYSFS_eof(void *handle);
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   599
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   600
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   601
/**
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   602
 * Determine current position within a PhysicsFS filehandle.
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   603
 *
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   604
 *   @param handle handle returned from PHYSFS_open*().
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 *  @return offset in bytes from start of file. -1 if error occurred.
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 *           Specifics of the error can be gleaned from PHYSFS_getLastError().
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 */
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int PHYSFS_tell(void *handle);
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   609
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   610
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   611
/**
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   612
 * Seek to a new position within a PhysicsFS filehandle. The next read or write
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 *  will occur at that place. Seeking past the beginning or end of the file is
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   614
 *  not allowed.
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   615
 *
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   616
 *   @param handle handle returned from PHYSFS_open*().
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   617
 *   @param pos number of bytes from start of file to seek to.
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   618
 *  @return nonzero on success, zero on error. Specifics of the error can be
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   619
 *          gleaned from PHYSFS_getLastError().
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   620
 */
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   621
int PHYSFS_seek(void *handle, int pos);
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   622
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   623
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   624
/* Byte-order reading. !!!  Need types (Int16, Int32, etc) for these...
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   625
int PHYSFS_readLE16(void *handle, int *buffer);
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   626
int PHYSFS_readLE32(void *handle, int *buffer);
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   627
int PHYSFS_readBE16(void *handle, int *buffer);
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   628
int PHYSFS_readBE32(void *handle, int *buffer);
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   629
int PHYSFS_writeLE16(void *handle, int buffer);
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   630
int PHYSFS_writeLE32(void *handle, int buffer);
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   631
int PHYSFS_writeBE16(void *handle, int buffer);
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   632
int PHYSFS_writeBE32(void *handle, int buffer);
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   633
*/
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   634
2
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
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   635
/* !!! need way to enumerate the contents of a directory. */
24ba671694af Fixed typos, expanded documentation, added init and deinit functions, and
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diff changeset
   636
1
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   637
#ifdef __cplusplus
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   638
}
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   639
#endif
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   640
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   641
#endif  /* !defined _INCLUDE_PHYSFS_H_ */
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   642
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   643
/* end of physfs.h ... */
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   644