physfs/physfs_internal.h

468 lines
16 KiB
C

/*
* Internal function/structure declaration. Do NOT include in your
* application.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#ifndef _INCLUDE_PHYSFS_INTERNAL_H_
#define _INCLUDE_PHYSFS_INTERNAL_H_
#ifndef __PHYSICSFS_INTERNAL__
#error Do not include this header from your applications.
#endif
struct __PHYSFS_DIRHANDLE__;
struct __PHYSFS_FILEFUNCTIONS__;
typedef struct __PHYSFS_LINKEDSTRINGLIST__
{
char *str;
struct __PHYSFS_LINKEDSTRINGLIST__ *next;
} LinkedStringList;
typedef struct __PHYSFS_FILEHANDLE__
{
/*
* This is reserved for the driver to store information.
*/
void *opaque;
/*
* This should be the DirHandle that created this FileHandle.
*/
const struct __PHYSFS_DIRHANDLE__ *dirHandle;
/*
* Pointer to the file i/o functions for this filehandle.
*/
const struct __PHYSFS_FILEFUNCTIONS__ *funcs;
} FileHandle;
typedef struct __PHYSFS_FILEFUNCTIONS__
{
/*
* Read more from the file.
* Returns number of objects of (objSize) bytes read from file, -1
* if complete failure.
* On failure, call __PHYSFS_setError().
*/
int (*read)(FileHandle *handle, void *buffer,
unsigned int objSize, unsigned int objCount);
/*
* Write more to the file. Archives don't have to implement this.
* (Set it to NULL if not implemented).
* Returns number of objects of (objSize) bytes written to file, -1
* if complete failure.
* On failure, call __PHYSFS_setError().
*/
int (*write)(FileHandle *handle, void *buffer,
unsigned int objSize, unsigned int objCount);
/*
* Returns non-zero if at end of file.
*/
int (*eof)(FileHandle *handle);
/*
* Returns byte offset from start of file.
*/
int (*tell)(FileHandle *handle);
/*
* Move read/write pointer to byte offset from start of file.
* Returns non-zero on success, zero on error.
* On failure, call __PHYSFS_setError().
*/
int (*seek)(FileHandle *handle, int offset);
/*
* Return number of bytes available in the file, or -1 if you
* aren't able to determine.
* On failure, call __PHYSFS_setError().
*/
int (*fileLength)(FileHandle *handle);
/*
* Close the file, and free the FileHandle structure (including "opaque").
* returns non-zero on success, zero if can't close file.
* On failure, call __PHYSFS_setError().
*/
int (*fileClose)(FileHandle *handle);
} FileFunctions;
typedef struct __PHYSFS_DIRHANDLE__
{
/*
* This is reserved for the driver to store information.
*/
void *opaque;
/*
* Pointer to the directory i/o functions for this handle.
*/
const struct __PHYSFS_DIRFUNCTIONS__ *funcs;
} DirHandle;
/*
* Symlinks should always be followed; PhysicsFS will use
* DirFunctions->isSymLink() and make a judgement on whether to
* continue to call other methods based on that.
*/
typedef struct __PHYSFS_DIRFUNCTIONS__
{
/*
* Returns non-zero if (filename) is a valid archive that this
* driver can handle. This filename is in platform-dependent
* notation. forWriting is non-zero if this is to be used for
* the write directory, and zero if this is to be used for an
* element of the search path.
*/
int (*isArchive)(const char *filename, int forWriting);
/*
* Return a DirHandle for dir/archive (name).
* This filename is in platform-dependent notation.
* forWriting is non-zero if this is to be used for
* the write directory, and zero if this is to be used for an
* element of the search path.
* Returns NULL on failure, and calls __PHYSFS_setError().
*/
DirHandle *(*openArchive)(const char *name, int forWriting);
/*
* Returns a list of all files in dirname. Each element of this list
* (and its "str" field) will be deallocated with the system's free()
* function by the caller, so be sure to explicitly malloc() each
* chunk. Omit symlinks if (omitSymLinks) is non-zero.
* If you have a memory failure, return as much as you can.
* This dirname is in platform-independent notation.
*/
LinkedStringList *(*enumerateFiles)(DirHandle *r,
const char *dirname,
int omitSymLinks);
/*
* Returns non-zero if filename can be opened for reading.
* This filename is in platform-independent notation.
*/
int (*exists)(DirHandle *r, const char *name);
/*
* Returns non-zero if filename is really a directory.
* This filename is in platform-independent notation.
*/
int (*isDirectory)(DirHandle *r, const char *name);
/*
* Returns non-zero if filename is really a symlink.
* This filename is in platform-independent notation.
*/
int (*isSymLink)(DirHandle *r, const char *name);
/*
* Open file for reading, and return a FileHandle.
* This filename is in platform-independent notation.
* If you can't handle multiple opens of the same file,
* you can opt to fail for the second call.
* Fail if the file does not exist.
* Returns NULL on failure, and calls __PHYSFS_setError().
*/
FileHandle *(*openRead)(DirHandle *r, const char *filename);
/*
* Open file for writing, and return a FileHandle.
* If the file does not exist, it should be created. If it exists,
* it should be truncated to zero bytes. The writing
* offset should be the start of the file.
* This filename is in platform-independent notation.
* This method may be NULL.
* If you can't handle multiple opens of the same file,
* you can opt to fail for the second call.
* Returns NULL on failure, and calls __PHYSFS_setError().
*/
FileHandle *(*openWrite)(DirHandle *r, const char *filename);
/*
* Open file for appending, and return a FileHandle.
* If the file does not exist, it should be created. The writing
* offset should be the end of the file.
* This filename is in platform-independent notation.
* This method may be NULL.
* If you can't handle multiple opens of the same file,
* you can opt to fail for the second call.
* Returns NULL on failure, and calls __PHYSFS_setError().
*/
FileHandle *(*openAppend)(DirHandle *r, const char *filename);
/*
* Delete a file in the archive/directory.
* Return non-zero on success, zero on failure.
* This filename is in platform-independent notation.
* This method may be NULL.
* On failure, call __PHYSFS_setError().
*/
int (*remove)(DirHandle *r, const char *filename);
/*
* Create a directory in the archive/directory.
* If the application is trying to make multiple dirs, PhysicsFS
* will split them up into multiple calls before passing them to
* your driver.
* Return non-zero on success, zero on failure.
* This filename is in platform-independent notation.
* This method may be NULL.
* On failure, call __PHYSFS_setError().
*/
int (*mkdir)(DirHandle *r, const char *filename);
/*
* Close directories/archives, and free the handle, including
* the "opaque" entry. This should assume that it won't be called if
* there are still files open from this DirHandle.
*/
void (*dirClose)(DirHandle *r);
} DirFunctions;
/* error messages... */
#define ERR_IS_INITIALIZED "Already initialized"
#define ERR_NOT_INITIALIZED "Not initialized"
#define ERR_INVALID_ARGUMENT "Invalid argument"
#define ERR_FILES_STILL_OPEN "Files still open"
#define ERR_NO_DIR_CREATE "Failed to create directories"
#define ERR_OUT_OF_MEMORY "Out of memory"
#define ERR_NOT_IN_SEARCH_PATH "No such entry in search path"
#define ERR_NOT_SUPPORTED "Operation not supported"
#define ERR_UNSUPPORTED_ARCHIVE "Archive type unsupported"
#define ERR_NOT_A_HANDLE "Not a file handle"
#define ERR_INSECURE_FNAME "Insecure filename"
#define ERR_SYMLINK_DISALLOWED "Symbolic links are disabled"
#define ERR_NO_WRITE_DIR "Write directory is not set"
#define ERR_NO_SUCH_FILE "No such file"
#define ERR_PAST_EOF "Past end of file"
#define ERR_ARC_IS_READ_ONLY "Archive is read-only"
#define ERR_IO_ERROR "I/O error"
#define ERR_CANT_SET_WRITE_DIR "Can't set write directory"
#define ERR_TOO_MANY_SYMLINKS "Too many symbolic links"
#define ERR_COMPRESSION "(De)compression error"
/*
* Call this to set the message returned by PHYSFS_getLastError().
* Please only use the ERR_* constants above, or add new constants to the
* above group, but I want these all in one place.
*
* Calling this with a NULL argument is a safe no-op.
*/
void __PHYSFS_setError(const char *err);
/*
* Convert (dirName) to platform-dependent notation, then prepend (prepend)
* and append (append) to the converted string.
*
* So, on Win32, calling:
* __PHYSFS_convertToDependent("C:\", "my/files", NULL);
* ...will return the string "C:\my\files".
*
* This is a convenience function; you might want to hack something out that
* is less generic (and therefore more efficient).
*
* Be sure to free() the return value when done with it.
*/
char *__PHYSFS_convertToDependent(const char *prepend,
const char *dirName,
const char *append);
/*
* Verify that (fname) (in platform-independent notation), in relation
* to (h) is secure. That means that each element of fname is checked
* for symlinks (if they aren't permitted). Also, elements such as
* ".", "..", or ":" are flagged.
*
* Returns non-zero if string is safe, zero if there's a security issue.
* PHYSFS_getLastError() will specify what was wrong.
*/
int __PHYSFS_verifySecurity(DirHandle *h, const char *fname);
/* These get used all over for lessening code clutter. */
#define BAIL_MACRO(e, r) { __PHYSFS_setError(e); return r; }
#define BAIL_IF_MACRO(c, e, r) if (c) { __PHYSFS_setError(e); return r; }
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/*------------ ----------------*/
/*------------ You MUST implement the following functions ----------------*/
/*------------ if porting to a new platform. ----------------*/
/*------------ (see platform/unix.c for an example) ----------------*/
/*------------ ----------------*/
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/*
* The dir separator; "/" on unix, "\\" on win32, ":" on MacOS, etc...
* Obviously, this isn't a function, but it IS a null-terminated string.
*/
extern const char *__PHYSFS_platformDirSeparator;
/*
* Platform implementation of PHYSFS_getCdRomDirs()...
* See physfs.h. The retval should be freeable via PHYSFS_freeList().
*/
char **__PHYSFS_platformDetectAvailableCDs(void);
/*
* Calculate the base dir, if your platform needs special consideration.
* Just return NULL if the standard routines will suffice. (see
* calculateBaseDir() in physfs.c ...)
* Caller will free() the retval if it's not NULL.
*/
char *__PHYSFS_platformCalcBaseDir(const char *argv0);
/*
* Get the platform-specific user name.
* Caller will free() the retval if it's not NULL. If it's NULL, the username
* will default to "default".
*/
char *__PHYSFS_platformGetUserName(void);
/*
* Get the platform-specific user dir.
* Caller will free() the retval if it's not NULL. If it's NULL, the userdir
* will default to basedir/username.
*/
char *__PHYSFS_platformGetUserDir(void);
/*
* Return a number that uniquely identifies the current thread.
* On a platform without threading, (1) will suffice. These numbers are
* arbitrary; the only requirement is that no two threads have the same
* number.
*/
int __PHYSFS_platformGetThreadID(void);
/*
* This is a pass-through to whatever stricmp() is called on your platform.
*/
int __PHYSFS_platformStricmp(const char *str1, const char *str2);
/*
* Return non-zero if filename (in platform-dependent notation) exists.
* Symlinks should be followed; if what the symlink points to is missing,
* then the retval is false.
*/
int __PHYSFS_platformExists(const char *fname);
/*
* Return non-zero if filename (in platform-dependent notation) is a symlink.
*/
int __PHYSFS_platformIsSymLink(const char *fname);
/*
* Return non-zero if filename (in platform-dependent notation) is a symlink.
* Symlinks should be followed; if what the symlink points to is missing,
* or isn't a directory, then the retval is false.
*/
int __PHYSFS_platformIsDirectory(const char *fname);
/*
* Convert (dirName) to platform-dependent notation, then prepend (prepend)
* and append (append) to the converted string.
*
* So, on Win32, calling:
* __PHYSFS_platformCvtToDependent("C:\", "my/files", NULL);
* ...will return the string "C:\my\files".
*
* This can be implemented in a platform-specific manner, so you can get
* get a speed boost that the default implementation can't, since
* you can make assumptions about the size of strings, etc..
*
* Platforms that choose not to implement this may just call
* __PHYSFS_convertToDependent() as a passthrough.
*
* Be sure to free() the return value when done with it.
*/
char *__PHYSFS_platformCvtToDependent(const char *prepend,
const char *dirName,
const char *append);
/*
* Make the current thread give up a timeslice. This is called in a loop
* while waiting for various external forces to get back to us.
*/
void __PHYSFS_platformTimeslice(void);
/*
* Enumerate a directory of files. This follows the rules for the
* DirFunctions->enumerateFiles() method (see above), except that the
* (dirName) that is passed to this function is converted to
* platform-DEPENDENT notation by the caller. The DirFunctions version
* uses platform-independent notation. Note that ".", "..", and other
* metaentries should always be ignored.
*/
LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname,
int omitSymLinks);
/*
* Determine the current size of a file, in bytes, from a stdio FILE *.
* Return -1 if you can't do it, and call __PHYSFS_setError().
*/
int __PHYSFS_platformFileLength(FILE *handle);
/*
* Get the current working directory. The return value should be an
* absolute path in platform-dependent notation. The caller will deallocate
* the return value with the standard C runtime free() function when it
* is done with it.
* On error, return NULL and set the error message.
*/
char *__PHYSFS_platformCurrentDir(void);
/*
* Get the real physical path to a file. (path) is specified in
* platform-dependent notation, as should your return value be.
* All relative paths should be removed, leaving you with an absolute
* path. Symlinks should be resolved, too, so that the returned value is
* the most direct path to a file.
* The return value will be deallocated with the standard C runtime free()
* function when the caller is done with it.
* On error, return NULL and set the error message.
*/
char *__PHYSFS_platformRealPath(const char *path);
/*
* Make a directory in the actual filesystem. (path) is specified in
* platform-dependent notation. On error, return zero and set the error
* message. Return non-zero on success.
*/
int __PHYSFS_platformMkDir(const char *path);
#ifdef __cplusplus
extern "C" {
#endif
#endif
/* end of physfs_internal.h ... */