/* * 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 #include "physfs.h" #ifdef __cplusplus extern "C" { #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(). */ PHYSFS_sint64 (*read)(FileHandle *handle, void *buffer, PHYSFS_uint32 objSize, PHYSFS_uint32 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(). */ PHYSFS_sint64 (*write)(FileHandle *handle, const void *buffer, PHYSFS_uint32 objSize, PHYSFS_uint32 objCount); /* * Returns non-zero if at end of file. */ int (*eof)(FileHandle *handle); /* * Returns byte offset from start of file. */ PHYSFS_sint64 (*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, PHYSFS_uint64 offset); /* * Return number of bytes available in the file, or -1 if you * aren't able to determine. * On failure, call __PHYSFS_setError(). */ PHYSFS_sint64 (*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); /* * Retrieve the last modification time (mtime) of a file. * Returns -1 on failure, or the file's mtime in seconds since * the epoch (Jan 1, 1970) on success. * This filename is in platform-independent notation. */ PHYSFS_sint64 (*getLastModTime)(DirHandle *r, const char *filename); /* * 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" #define ERR_NOT_IMPLEMENTED "Not implemented" #define ERR_OS_ERROR "Operating system reported error" #define ERR_FILE_EXISTS "File already exists" #define ERR_NOT_A_DIR "Not a directory" #define ERR_FILE_NOT_FOUND "File not found" /* * 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; } #define BAIL_MACRO_MUTEX(e, m, r) { __PHYSFS_setError(e); __PHYSFS_platformReleaseMutex(m); return r; } #define BAIL_IF_MACRO_MUTEX(c, e, m, r) if (c) { __PHYSFS_setError(e); __PHYSFS_platformReleaseMutex(m); 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; /* * Initialize the platform. This is called when PHYSFS_init() is called from * the application. You can use this to (for example) determine what version * of Windows you're running. * * Return zero if there was a catastrophic failure (which prevents you from * functioning at all), and non-zero otherwise. */ int __PHYSFS_platformInit(void); /* * Deinitialize the platform. This is called when PHYSFS_deinit() is called * from the application. You can use this to clean up anything you've * allocated in your platform driver. * * Return zero if there was a catastrophic failure (which prevents you from * functioning at all), and non-zero otherwise. */ int __PHYSFS_platformDeinit(void); /* * Open a file for reading. (filename) is in platform-dependent notation. The * file pointer should be positioned on the first byte of the file. * * The return value will be some platform-specific datatype that is opaque to * the caller; it could be a (FILE *) under Unix, or a (HANDLE *) under win32. * * The same file can be opened for read multiple times, and each should have * a unique file handle; this is frequently employed to prevent race * conditions in the archivers. * * Call __PHYSFS_setError() and return (NULL) if the file can't be opened. */ void *__PHYSFS_platformOpenRead(const char *filename); /* * Open a file for writing. (filename) is in platform-dependent notation. If * the file exists, it should be truncated to zero bytes, and if it doesn't * exist, it should be created as a zero-byte file. The file pointer should * be positioned on the first byte of the file. * * The return value will be some platform-specific datatype that is opaque to * the caller; it could be a (FILE *) under Unix, or a (HANDLE *) under win32, * etc. * * Opening a file for write multiple times has undefined results. * * Call __PHYSFS_setError() and return (NULL) if the file can't be opened. */ void *__PHYSFS_platformOpenWrite(const char *filename); /* * Open a file for appending. (filename) is in platform-dependent notation. If * the file exists, the file pointer should be place just past the end of the * file, so that the first write will be one byte after the current end of * the file. If the file doesn't exist, it should be created as a zero-byte * file. The file pointer should be positioned on the first byte of the file. * * The return value will be some platform-specific datatype that is opaque to * the caller; it could be a (FILE *) under Unix, or a (HANDLE *) under win32, * etc. * * Opening a file for append multiple times has undefined results. * * Call __PHYSFS_setError() and return (NULL) if the file can't be opened. */ void *__PHYSFS_platformOpenAppend(const char *filename); /* * Read more data from a platform-specific file handle. (opaque) should be * cast to whatever data type your platform uses. Read a maximum of (count) * objects of (size) 8-bit bytes to the area pointed to by (buffer). If there * isn't enough data available, return the number of full objects read, and * position the file pointer at the start of the first incomplete object. * On success, return (count) and position the file pointer one byte past * the end of the last read object. Return (-1) if there is a catastrophic * error, and call __PHYSFS_setError() to describe the problem; the file * pointer should not move in such a case. */ PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer, PHYSFS_uint32 size, PHYSFS_uint32 count); /* * Write more data to a platform-specific file handle. (opaque) should be * cast to whatever data type your platform uses. Write a maximum of (count) * objects of (size) 8-bit bytes from the area pointed to by (buffer). If * there isn't enough data available, return the number of full objects * written, and position the file pointer at the start of the first * incomplete object. Return (-1) if there is a catastrophic error, and call * __PHYSFS_setError() to describe the problem; the file pointer should not * move in such a case. */ PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer, PHYSFS_uint32 size, PHYSFS_uint32 count); /* * Set the file pointer to a new position. (opaque) should be cast to * whatever data type your platform uses. (pos) specifies the number * of 8-bit bytes to seek to from the start of the file. Seeking past the * end of the file is an error condition, and you should check for it. * * Not all file types can seek; this is to be expected by the caller. * * On error, call __PHYSFS_setError() and return zero. On success, return * a non-zero value. */ int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos); /* * Get the file pointer's position, in an 8-bit byte offset from the start of * the file. (opaque) should be cast to whatever data type your platform * uses. * * Not all file types can "tell"; this is to be expected by the caller. * * On error, call __PHYSFS_setError() and return zero. On success, return * a non-zero value. */ PHYSFS_sint64 __PHYSFS_platformTell(void *opaque); /* * Determine the current size of a file, in 8-bit bytes, from an open file. * * The caller expects that this information may not be available for all * file types on all platforms. * * Return -1 if you can't do it, and call __PHYSFS_setError(). Otherwise, * return the file length in 8-bit bytes. */ PHYSFS_sint64 __PHYSFS_platformFileLength(void *handle); /* * Determine if a file is at EOF. (opaque) should be cast to whatever data * type your platform uses. * * The caller expects that there was a short read before calling this. * * Return non-zero if EOF, zero if it is _not_ EOF. */ int __PHYSFS_platformEOF(void *opaque); /* * Flush any pending writes to disk. (opaque) should be cast to whatever data * type your platform uses. Be sure to check for errors; the caller expects * that this function can fail if there was a flushing error, etc. * * Return zero on failure, non-zero on success. */ int __PHYSFS_platformFlush(void *opaque); /* * Flush and close a file. (opaque) should be cast to whatever data type * your platform uses. Be sure to check for errors when closing; the * caller expects that this function can fail if there was a flushing * error, etc. * * You should clean up all resources associated with (opaque). * * Return zero on failure, non-zero on success. */ int __PHYSFS_platformClose(void *opaque); /* * 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. */ PHYSFS_uint64 __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 the last modified time (in seconds since the epoch) of a file. * Returns -1 on failure. (fname) is in platform-dependent notation. * Symlinks should be followed; if what the symlink points to is missing, * then the retval is -1. */ PHYSFS_sint64 __PHYSFS_platformGetLastModTime(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, which may fit the bill * already. * * 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); /* * 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); /* * Remove a file or directory entry in the actual filesystem. (path) is * specified in platform-dependent notation. Note that this deletes files * _and_ directories, so you might need to do some determination. * Non-empty directories should report an error and not delete themselves * or their contents. * * Deleting a symlink should remove the link, not what it points to. * * On error, return zero and set the error message. Return non-zero on success. */ int __PHYSFS_platformDelete(const char *path); /* * Create a platform-specific mutex. This can be whatever datatype your * platform uses for mutexes, but it is cast to a (void *) for abstractness. * * Return (NULL) if you couldn't create one. Systems without threads can * return any arbitrary non-NULL value. */ void *__PHYSFS_platformCreateMutex(void); /* * Destroy a platform-specific mutex, and clean up any resources associated * with it. (mutex) is a value previously returned by * __PHYSFS_platformCreateMutex(). This can be a no-op on single-threaded * platforms. */ void __PHYSFS_platformDestroyMutex(void *mutex); /* * Grab possession of a platform-specific mutex. Mutexes should be recursive; * that is, the same thread should be able to call this function multiple * times in a row without causing a deadlock. This function should block * until a thread can gain possession of the mutex. * * Return non-zero if the mutex was grabbed, zero if there was an * unrecoverable problem grabbing it (this should not be a matter of * timing out! We're talking major system errors; block until the mutex * is available otherwise.) * * _DO NOT_ call __PHYSFS_setError() in here! Since setError calls this * function, you'll cause an infinite recursion. This means you can't * use the BAIL_*MACRO* macros, either. */ int __PHYSFS_platformGrabMutex(void *mutex); /* * Relinquish possession of the mutex when this method has been called * once for each time that platformGrabMutex was called. Once possession has * been released, the next thread in line to grab the mutex (if any) may * proceed. * * _DO NOT_ call __PHYSFS_setError() in here! Since setError calls this * function, you'll cause an infinite recursion. This means you can't * use the BAIL_*MACRO* macros, either. */ void __PHYSFS_platformReleaseMutex(void *mutex); #ifdef __cplusplus } #endif #endif /* end of physfs_internal.h ... */