/
physfs.c
3015 lines (2412 loc) · 83.8 KB
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/**
* PhysicsFS; a portable, flexible file i/o abstraction.
*
* Documentation is in physfs.h. It's verbose, honest. :)
*
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* Please see the file LICENSE.txt in the source's root directory.
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*
* This file written by Ryan C. Gordon.
*/
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/* !!! FIXME: ERR_PAST_EOF shouldn't trigger for reads. Just return zero. */
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#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
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typedef struct __PHYSFS_DIRHANDLE__
{
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void *opaque; /* Instance data unique to the archiver. */
char *dirName; /* Path to archive in platform-dependent notation. */
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char *mountPoint; /* Mountpoint in virtual file tree. */
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const PHYSFS_Archiver *funcs; /* Ptr to archiver info for this handle. */
struct __PHYSFS_DIRHANDLE__ *next; /* linked list stuff. */
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} DirHandle;
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typedef struct __PHYSFS_FILEHANDLE__
{
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PHYSFS_Io *io; /* Instance data unique to the archiver for this file. */
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PHYSFS_uint8 forReading; /* Non-zero if reading, zero if write/append */
const DirHandle *dirHandle; /* Archiver instance that created this */
PHYSFS_uint8 *buffer; /* Buffer, if set (NULL otherwise). Don't touch! */
PHYSFS_uint32 bufsize; /* Bufsize, if set (0 otherwise). Don't touch! */
PHYSFS_uint32 buffill; /* Buffer fill size. Don't touch! */
PHYSFS_uint32 bufpos; /* Buffer position. Don't touch! */
struct __PHYSFS_FILEHANDLE__ *next; /* linked list stuff. */
} FileHandle;
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typedef struct __PHYSFS_ERRSTATETYPE__
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{
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void *tid;
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PHYSFS_ErrorCode code;
struct __PHYSFS_ERRSTATETYPE__ *next;
} ErrState;
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/* General PhysicsFS state ... */
static int initialized = 0;
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static ErrState *errorStates = NULL;
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static DirHandle *searchPath = NULL;
static DirHandle *writeDir = NULL;
static FileHandle *openWriteList = NULL;
static FileHandle *openReadList = NULL;
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static char *baseDir = NULL;
static char *userDir = NULL;
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static char *prefDir = NULL;
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static int allowSymLinks = 0;
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static const PHYSFS_Archiver **archivers = NULL;
static const PHYSFS_ArchiveInfo **archiveInfo = NULL;
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static volatile size_t numArchivers = 0;
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/* mutexes ... */
static void *errorLock = NULL; /* protects error message list. */
static void *stateLock = NULL; /* protects other PhysFS static state. */
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/* allocator ... */
static int externalAllocator = 0;
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PHYSFS_Allocator allocator;
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/* PHYSFS_Io implementation for i/o to physical filesystem... */
/* !!! FIXME: maybe refcount the paths in a string pool? */
typedef struct __PHYSFS_NativeIoInfo
{
void *handle;
const char *path;
int mode; /* 'r', 'w', or 'a' */
} NativeIoInfo;
static PHYSFS_sint64 nativeIo_read(PHYSFS_Io *io, void *buf, PHYSFS_uint64 len)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_platformRead(info->handle, buf, len);
} /* nativeIo_read */
static PHYSFS_sint64 nativeIo_write(PHYSFS_Io *io, const void *buffer,
PHYSFS_uint64 len)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_platformWrite(info->handle, buffer, len);
} /* nativeIo_write */
static int nativeIo_seek(PHYSFS_Io *io, PHYSFS_uint64 offset)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_platformSeek(info->handle, offset);
} /* nativeIo_seek */
static PHYSFS_sint64 nativeIo_tell(PHYSFS_Io *io)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_platformTell(info->handle);
} /* nativeIo_tell */
static PHYSFS_sint64 nativeIo_length(PHYSFS_Io *io)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_platformFileLength(info->handle);
} /* nativeIo_length */
static PHYSFS_Io *nativeIo_duplicate(PHYSFS_Io *io)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
return __PHYSFS_createNativeIo(info->path, info->mode);
} /* nativeIo_duplicate */
static int nativeIo_flush(PHYSFS_Io *io)
{
return __PHYSFS_platformFlush(io->opaque);
} /* nativeIo_flush */
static void nativeIo_destroy(PHYSFS_Io *io)
{
NativeIoInfo *info = (NativeIoInfo *) io->opaque;
__PHYSFS_platformClose(info->handle);
allocator.Free((void *) info->path);
allocator.Free(info);
allocator.Free(io);
} /* nativeIo_destroy */
static const PHYSFS_Io __PHYSFS_nativeIoInterface =
{
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CURRENT_PHYSFS_IO_API_VERSION, NULL,
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nativeIo_read,
nativeIo_write,
nativeIo_seek,
nativeIo_tell,
nativeIo_length,
nativeIo_duplicate,
nativeIo_flush,
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nativeIo_destroy
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};
PHYSFS_Io *__PHYSFS_createNativeIo(const char *path, const int mode)
{
PHYSFS_Io *io = NULL;
NativeIoInfo *info = NULL;
void *handle = NULL;
char *pathdup = NULL;
assert((mode == 'r') || (mode == 'w') || (mode == 'a'));
io = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
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GOTO_IF(!io, PHYSFS_ERR_OUT_OF_MEMORY, createNativeIo_failed);
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info = (NativeIoInfo *) allocator.Malloc(sizeof (NativeIoInfo));
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GOTO_IF(!info, PHYSFS_ERR_OUT_OF_MEMORY, createNativeIo_failed);
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pathdup = (char *) allocator.Malloc(strlen(path) + 1);
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GOTO_IF(!pathdup, PHYSFS_ERR_OUT_OF_MEMORY, createNativeIo_failed);
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if (mode == 'r')
handle = __PHYSFS_platformOpenRead(path);
else if (mode == 'w')
handle = __PHYSFS_platformOpenWrite(path);
else if (mode == 'a')
handle = __PHYSFS_platformOpenAppend(path);
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GOTO_IF_ERRPASS(!handle, createNativeIo_failed);
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strcpy(pathdup, path);
info->handle = handle;
info->path = pathdup;
info->mode = mode;
memcpy(io, &__PHYSFS_nativeIoInterface, sizeof (*io));
io->opaque = info;
return io;
createNativeIo_failed:
if (handle != NULL) __PHYSFS_platformClose(handle);
if (pathdup != NULL) allocator.Free(pathdup);
if (info != NULL) allocator.Free(info);
if (io != NULL) allocator.Free(io);
return NULL;
} /* __PHYSFS_createNativeIo */
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/* PHYSFS_Io implementation for i/o to a memory buffer... */
typedef struct __PHYSFS_MemoryIoInfo
{
const PHYSFS_uint8 *buf;
PHYSFS_uint64 len;
PHYSFS_uint64 pos;
PHYSFS_Io *parent;
volatile PHYSFS_uint32 refcount;
void (*destruct)(void *);
} MemoryIoInfo;
static PHYSFS_sint64 memoryIo_read(PHYSFS_Io *io, void *buf, PHYSFS_uint64 len)
{
MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
const PHYSFS_uint64 avail = info->len - info->pos;
assert(avail <= info->len);
if (avail == 0)
return 0; /* we're at EOF; nothing to do. */
if (len > avail)
len = avail;
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memcpy(buf, info->buf + info->pos, (size_t) len);
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info->pos += len;
return len;
} /* memoryIo_read */
static PHYSFS_sint64 memoryIo_write(PHYSFS_Io *io, const void *buffer,
PHYSFS_uint64 len)
{
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BAIL(PHYSFS_ERR_OPEN_FOR_READING, -1);
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} /* memoryIo_write */
static int memoryIo_seek(PHYSFS_Io *io, PHYSFS_uint64 offset)
{
MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
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BAIL_IF(offset > info->len, PHYSFS_ERR_PAST_EOF, 0);
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info->pos = offset;
return 1;
} /* memoryIo_seek */
static PHYSFS_sint64 memoryIo_tell(PHYSFS_Io *io)
{
const MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
return (PHYSFS_sint64) info->pos;
} /* memoryIo_tell */
static PHYSFS_sint64 memoryIo_length(PHYSFS_Io *io)
{
const MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
return (PHYSFS_sint64) info->len;
} /* memoryIo_length */
static PHYSFS_Io *memoryIo_duplicate(PHYSFS_Io *io)
{
MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
MemoryIoInfo *newinfo = NULL;
PHYSFS_Io *parent = info->parent;
PHYSFS_Io *retval = NULL;
/* avoid deep copies. */
assert((!parent) || (!((MemoryIoInfo *) parent->opaque)->parent) );
/* share the buffer between duplicates. */
if (parent != NULL) /* dup the parent, increment its refcount. */
return parent->duplicate(parent);
/* we're the parent. */
retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
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BAIL_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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newinfo = (MemoryIoInfo *) allocator.Malloc(sizeof (MemoryIoInfo));
if (!newinfo)
{
allocator.Free(retval);
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BAIL(PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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} /* if */
/* !!! FIXME: want lockless atomic increment. */
__PHYSFS_platformGrabMutex(stateLock);
info->refcount++;
__PHYSFS_platformReleaseMutex(stateLock);
memset(newinfo, '\0', sizeof (*info));
newinfo->buf = info->buf;
newinfo->len = info->len;
newinfo->pos = 0;
newinfo->parent = io;
newinfo->refcount = 0;
newinfo->destruct = NULL;
memcpy(retval, io, sizeof (*retval));
retval->opaque = newinfo;
return retval;
} /* memoryIo_duplicate */
static int memoryIo_flush(PHYSFS_Io *io) { return 1; /* it's read-only. */ }
static void memoryIo_destroy(PHYSFS_Io *io)
{
MemoryIoInfo *info = (MemoryIoInfo *) io->opaque;
PHYSFS_Io *parent = info->parent;
int should_die = 0;
if (parent != NULL)
{
assert(info->buf == ((MemoryIoInfo *) info->parent->opaque)->buf);
assert(info->len == ((MemoryIoInfo *) info->parent->opaque)->len);
assert(info->refcount == 0);
assert(info->destruct == NULL);
allocator.Free(info);
allocator.Free(io);
parent->destroy(parent); /* decrements refcount. */
return;
} /* if */
/* we _are_ the parent. */
assert(info->refcount > 0); /* even in a race, we hold a reference. */
/* !!! FIXME: want lockless atomic decrement. */
__PHYSFS_platformGrabMutex(stateLock);
info->refcount--;
should_die = (info->refcount == 0);
__PHYSFS_platformReleaseMutex(stateLock);
if (should_die)
{
void (*destruct)(void *) = info->destruct;
void *buf = (void *) info->buf;
io->opaque = NULL; /* kill this here in case of race. */
allocator.Free(info);
allocator.Free(io);
if (destruct != NULL)
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destruct(buf);
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} /* if */
} /* memoryIo_destroy */
static const PHYSFS_Io __PHYSFS_memoryIoInterface =
{
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CURRENT_PHYSFS_IO_API_VERSION, NULL,
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memoryIo_read,
memoryIo_write,
memoryIo_seek,
memoryIo_tell,
memoryIo_length,
memoryIo_duplicate,
memoryIo_flush,
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memoryIo_destroy
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};
PHYSFS_Io *__PHYSFS_createMemoryIo(const void *buf, PHYSFS_uint64 len,
void (*destruct)(void *))
{
PHYSFS_Io *io = NULL;
MemoryIoInfo *info = NULL;
io = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
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GOTO_IF(!io, PHYSFS_ERR_OUT_OF_MEMORY, createMemoryIo_failed);
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info = (MemoryIoInfo *) allocator.Malloc(sizeof (MemoryIoInfo));
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GOTO_IF(!info, PHYSFS_ERR_OUT_OF_MEMORY, createMemoryIo_failed);
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memset(info, '\0', sizeof (*info));
info->buf = (const PHYSFS_uint8 *) buf;
info->len = len;
info->pos = 0;
info->parent = NULL;
info->refcount = 1;
info->destruct = destruct;
memcpy(io, &__PHYSFS_memoryIoInterface, sizeof (*io));
io->opaque = info;
return io;
createMemoryIo_failed:
if (info != NULL) allocator.Free(info);
if (io != NULL) allocator.Free(io);
return NULL;
} /* __PHYSFS_createMemoryIo */
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/* PHYSFS_Io implementation for i/o to a PHYSFS_File... */
static PHYSFS_sint64 handleIo_read(PHYSFS_Io *io, void *buf, PHYSFS_uint64 len)
{
return PHYSFS_readBytes((PHYSFS_File *) io->opaque, buf, len);
} /* handleIo_read */
static PHYSFS_sint64 handleIo_write(PHYSFS_Io *io, const void *buffer,
PHYSFS_uint64 len)
{
return PHYSFS_writeBytes((PHYSFS_File *) io->opaque, buffer, len);
} /* handleIo_write */
static int handleIo_seek(PHYSFS_Io *io, PHYSFS_uint64 offset)
{
return PHYSFS_seek((PHYSFS_File *) io->opaque, offset);
} /* handleIo_seek */
static PHYSFS_sint64 handleIo_tell(PHYSFS_Io *io)
{
return PHYSFS_tell((PHYSFS_File *) io->opaque);
} /* handleIo_tell */
static PHYSFS_sint64 handleIo_length(PHYSFS_Io *io)
{
return PHYSFS_fileLength((PHYSFS_File *) io->opaque);
} /* handleIo_length */
static PHYSFS_Io *handleIo_duplicate(PHYSFS_Io *io)
{
/*
* There's no duplicate at the PHYSFS_File level, so we break the
* abstraction. We're allowed to: we're physfs.c!
*/
FileHandle *origfh = (FileHandle *) io->opaque;
FileHandle *newfh = (FileHandle *) allocator.Malloc(sizeof (FileHandle));
PHYSFS_Io *retval = NULL;
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GOTO_IF(!newfh, PHYSFS_ERR_OUT_OF_MEMORY, handleIo_dupe_failed);
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memset(newfh, '\0', sizeof (*newfh));
retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
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GOTO_IF(!retval, PHYSFS_ERR_OUT_OF_MEMORY, handleIo_dupe_failed);
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#if 0 /* we don't buffer the duplicate, at least not at the moment. */
if (origfh->buffer != NULL)
{
newfh->buffer = (PHYSFS_uint8 *) allocator.Malloc(origfh->bufsize);
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if (!newfh->buffer)
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GOTO(PHYSFS_ERR_OUT_OF_MEMORY, handleIo_dupe_failed);
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newfh->bufsize = origfh->bufsize;
} /* if */
#endif
newfh->io = origfh->io->duplicate(origfh->io);
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GOTO_IF_ERRPASS(!newfh->io, handleIo_dupe_failed);
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newfh->forReading = origfh->forReading;
newfh->dirHandle = origfh->dirHandle;
__PHYSFS_platformGrabMutex(stateLock);
if (newfh->forReading)
{
newfh->next = openReadList;
openReadList = newfh;
} /* if */
else
{
newfh->next = openWriteList;
openWriteList = newfh;
} /* else */
__PHYSFS_platformReleaseMutex(stateLock);
memcpy(retval, io, sizeof (PHYSFS_Io));
retval->opaque = newfh;
return retval;
handleIo_dupe_failed:
if (newfh)
{
if (newfh->io != NULL) newfh->io->destroy(newfh->io);
if (newfh->buffer != NULL) allocator.Free(newfh->buffer);
allocator.Free(newfh);
} /* if */
return NULL;
} /* handleIo_duplicate */
static int handleIo_flush(PHYSFS_Io *io)
{
return PHYSFS_flush((PHYSFS_File *) io->opaque);
} /* handleIo_flush */
static void handleIo_destroy(PHYSFS_Io *io)
{
if (io->opaque != NULL)
PHYSFS_close((PHYSFS_File *) io->opaque);
allocator.Free(io);
} /* handleIo_destroy */
static const PHYSFS_Io __PHYSFS_handleIoInterface =
{
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CURRENT_PHYSFS_IO_API_VERSION, NULL,
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handleIo_read,
handleIo_write,
handleIo_seek,
handleIo_tell,
handleIo_length,
handleIo_duplicate,
handleIo_flush,
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handleIo_destroy
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};
static PHYSFS_Io *__PHYSFS_createHandleIo(PHYSFS_File *f)
{
PHYSFS_Io *io = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
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BAIL_IF(!io, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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memcpy(io, &__PHYSFS_handleIoInterface, sizeof (*io));
io->opaque = f;
return io;
} /* __PHYSFS_createHandleIo */
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/* functions ... */
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typedef struct
{
char **list;
PHYSFS_uint32 size;
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PHYSFS_ErrorCode errcode;
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} EnumStringListCallbackData;
static void enumStringListCallback(void *data, const char *str)
{
void *ptr;
char *newstr;
EnumStringListCallbackData *pecd = (EnumStringListCallbackData *) data;
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if (pecd->errcode)
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return;
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ptr = allocator.Realloc(pecd->list, (pecd->size + 2) * sizeof (char *));
newstr = (char *) allocator.Malloc(strlen(str) + 1);
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if (ptr != NULL)
pecd->list = (char **) ptr;
if ((ptr == NULL) || (newstr == NULL))
{
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pecd->errcode = PHYSFS_ERR_OUT_OF_MEMORY;
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pecd->list[pecd->size] = NULL;
PHYSFS_freeList(pecd->list);
return;
} /* if */
strcpy(newstr, str);
pecd->list[pecd->size] = newstr;
pecd->size++;
} /* enumStringListCallback */
static char **doEnumStringList(void (*func)(PHYSFS_StringCallback, void *))
{
EnumStringListCallbackData ecd;
memset(&ecd, '\0', sizeof (ecd));
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ecd.list = (char **) allocator.Malloc(sizeof (char *));
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BAIL_IF(!ecd.list, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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func(enumStringListCallback, &ecd);
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if (ecd.errcode)
{
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PHYSFS_setErrorCode(ecd.errcode);
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return NULL;
} /* if */
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ecd.list[ecd.size] = NULL;
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return ecd.list;
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} /* doEnumStringList */
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static void __PHYSFS_bubble_sort(void *a, size_t lo, size_t hi,
int (*cmpfn)(void *, size_t, size_t),
void (*swapfn)(void *, size_t, size_t))
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{
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size_t i;
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int sorted;
do
{
sorted = 1;
for (i = lo; i < hi; i++)
{
if (cmpfn(a, i, i + 1) > 0)
{
swapfn(a, i, i + 1);
sorted = 0;
} /* if */
} /* for */
} while (!sorted);
} /* __PHYSFS_bubble_sort */
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static void __PHYSFS_quick_sort(void *a, size_t lo, size_t hi,
int (*cmpfn)(void *, size_t, size_t),
void (*swapfn)(void *, size_t, size_t))
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{
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size_t i;
size_t j;
size_t v;
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if ((hi - lo) <= PHYSFS_QUICKSORT_THRESHOLD)
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__PHYSFS_bubble_sort(a, lo, hi, cmpfn, swapfn);
else
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{
i = (hi + lo) / 2;
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if (cmpfn(a, lo, i) > 0) swapfn(a, lo, i);
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if (cmpfn(a, lo, hi) > 0) swapfn(a, lo, hi);
if (cmpfn(a, i, hi) > 0) swapfn(a, i, hi);
j = hi - 1;
swapfn(a, i, j);
i = lo;
v = j;
while (1)
{
while(cmpfn(a, ++i, v) < 0) { /* do nothing */ }
while(cmpfn(a, --j, v) > 0) { /* do nothing */ }
if (j < i)
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break;
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swapfn(a, i, j);
} /* while */
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if (i != (hi-1))
swapfn(a, i, hi-1);
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__PHYSFS_quick_sort(a, lo, j, cmpfn, swapfn);
__PHYSFS_quick_sort(a, i+1, hi, cmpfn, swapfn);
} /* else */
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} /* __PHYSFS_quick_sort */
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void __PHYSFS_sort(void *entries, size_t max,
int (*cmpfn)(void *, size_t, size_t),
void (*swapfn)(void *, size_t, size_t))
613
614
615
{
/*
* Quicksort w/ Bubblesort fallback algorithm inspired by code from here:
616
* https://www.cs.ubc.ca/spider/harrison/Java/sorting-demo.html
617
*/
618
619
if (max > 0)
__PHYSFS_quick_sort(entries, 0, max - 1, cmpfn, swapfn);
620
621
622
} /* __PHYSFS_sort */
623
static ErrState *findErrorForCurrentThread(void)
624
{
625
ErrState *i;
626
void *tid;
627
628
if (errorLock != NULL)
629
630
__PHYSFS_platformGrabMutex(errorLock);
631
if (errorStates != NULL)
632
{
633
tid = __PHYSFS_platformGetThreadID();
634
635
for (i = errorStates; i != NULL; i = i->next)
636
637
{
if (i->tid == tid)
638
{
639
640
if (errorLock != NULL)
__PHYSFS_platformReleaseMutex(errorLock);
641
return i;
642
} /* if */
643
644
} /* for */
} /* if */
645
646
if (errorLock != NULL)
647
__PHYSFS_platformReleaseMutex(errorLock);
648
649
return NULL; /* no error available. */
650
651
652
} /* findErrorForCurrentThread */
653
654
655
656
657
658
659
660
/* this doesn't reset the error state. */
static inline PHYSFS_ErrorCode currentErrorCode(void)
{
const ErrState *err = findErrorForCurrentThread();
return err ? err->code : PHYSFS_ERR_OK;
} /* currentErrorCode */
661
PHYSFS_ErrorCode PHYSFS_getLastErrorCode(void)
662
{
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
ErrState *err = findErrorForCurrentThread();
const PHYSFS_ErrorCode retval = (err) ? err->code : PHYSFS_ERR_OK;
if (err)
err->code = PHYSFS_ERR_OK;
return retval;
} /* PHYSFS_getLastErrorCode */
PHYSFS_DECL const char *PHYSFS_getErrorByCode(PHYSFS_ErrorCode code)
{
switch (code)
{
case PHYSFS_ERR_OK: return "no error";
case PHYSFS_ERR_OTHER_ERROR: return "unknown error";
case PHYSFS_ERR_OUT_OF_MEMORY: return "out of memory";
case PHYSFS_ERR_NOT_INITIALIZED: return "not initialized";
case PHYSFS_ERR_IS_INITIALIZED: return "already initialized";
case PHYSFS_ERR_ARGV0_IS_NULL: return "argv[0] is NULL";
case PHYSFS_ERR_UNSUPPORTED: return "unsupported";
case PHYSFS_ERR_PAST_EOF: return "past end of file";
case PHYSFS_ERR_FILES_STILL_OPEN: return "files still open";
case PHYSFS_ERR_INVALID_ARGUMENT: return "invalid argument";
case PHYSFS_ERR_NOT_MOUNTED: return "not mounted";
686
case PHYSFS_ERR_NOT_FOUND: return "not found";
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
case PHYSFS_ERR_SYMLINK_FORBIDDEN: return "symlinks are forbidden";
case PHYSFS_ERR_NO_WRITE_DIR: return "write directory is not set";
case PHYSFS_ERR_OPEN_FOR_READING: return "file open for reading";
case PHYSFS_ERR_OPEN_FOR_WRITING: return "file open for writing";
case PHYSFS_ERR_NOT_A_FILE: return "not a file";
case PHYSFS_ERR_READ_ONLY: return "read-only filesystem";
case PHYSFS_ERR_CORRUPT: return "corrupted";
case PHYSFS_ERR_SYMLINK_LOOP: return "infinite symbolic link loop";
case PHYSFS_ERR_IO: return "i/o error";
case PHYSFS_ERR_PERMISSION: return "permission denied";
case PHYSFS_ERR_NO_SPACE: return "no space available for writing";
case PHYSFS_ERR_BAD_FILENAME: return "filename is illegal or insecure";
case PHYSFS_ERR_BUSY: return "tried to modify a file the OS needs";
case PHYSFS_ERR_DIR_NOT_EMPTY: return "directory isn't empty";
case PHYSFS_ERR_OS_ERROR: return "OS reported an error";
702
case PHYSFS_ERR_DUPLICATE: return "duplicate resource";
703
case PHYSFS_ERR_BAD_PASSWORD: return "bad password";
704
705
706
707
708
709
} /* switch */
return NULL; /* don't know this error code. */
} /* PHYSFS_getErrorByCode */
710
void PHYSFS_setErrorCode(PHYSFS_ErrorCode errcode)
711
{
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
ErrState *err;
if (!errcode)
return;
err = findErrorForCurrentThread();
if (err == NULL)
{
err = (ErrState *) allocator.Malloc(sizeof (ErrState));
if (err == NULL)
return; /* uhh...? */
memset(err, '\0', sizeof (ErrState));
err->tid = __PHYSFS_platformGetThreadID();
if (errorLock != NULL)
__PHYSFS_platformGrabMutex(errorLock);
err->next = errorStates;
errorStates = err;
if (errorLock != NULL)
__PHYSFS_platformReleaseMutex(errorLock);
} /* if */
err->code = errcode;
738
} /* PHYSFS_setErrorCode */
739
740
741
742
743
744
const char *PHYSFS_getLastError(void)
{
const PHYSFS_ErrorCode err = PHYSFS_getLastErrorCode();
return (err) ? PHYSFS_getErrorByCode(err) : NULL;
745
746
747
748
} /* PHYSFS_getLastError */
/* MAKE SURE that errorLock is held before calling this! */
749
static void freeErrorStates(void)
750
{
751
752
ErrState *i;
ErrState *next;
753
754
for (i = errorStates; i != NULL; i = next)
755
{
756
next = i->next;
757
allocator.Free(i);
758
} /* for */
759
760
761
errorStates = NULL;
} /* freeErrorStates */
762
763
764
765
766
767
768
769
770
771
772
773
774
void PHYSFS_getLinkedVersion(PHYSFS_Version *ver)
{
if (ver != NULL)
{
ver->major = PHYSFS_VER_MAJOR;
ver->minor = PHYSFS_VER_MINOR;
ver->patch = PHYSFS_VER_PATCH;
} /* if */
} /* PHYSFS_getLinkedVersion */
775
776
static const char *find_filename_extension(const char *fname)
{
777
778
const char *retval = NULL;
if (fname != NULL)
779
{
780
781
const char *p = strchr(fname, '.');
retval = p;
782
783
784
785
786
787
788
789
790
791
792
while (p != NULL)
{
p = strchr(p + 1, '.');
if (p != NULL)
retval = p;
} /* while */
if (retval != NULL)
retval++; /* skip '.' */
} /* if */
793
794
return retval;
795
796
797
} /* find_filename_extension */
798
static DirHandle *tryOpenDir(PHYSFS_Io *io, const PHYSFS_Archiver *funcs,
799
const char *d, int forWriting)
800
801
{
DirHandle *retval = NULL;
802
803
804
void *opaque = NULL;
if (io != NULL)
805
BAIL_IF_ERRPASS(!io->seek(io, 0), NULL);
806
807
opaque = funcs->openArchive(io, d, forWriting);
808
if (opaque != NULL)
809
{
810
811
retval = (DirHandle *) allocator.Malloc(sizeof (DirHandle));
if (retval == NULL)
812
funcs->closeArchive(opaque);
813
else
814
{
815
816
817
818
819
memset(retval, '\0', sizeof (DirHandle));
retval->mountPoint = NULL;
retval->funcs = funcs;
retval->opaque = opaque;
} /* else */
820
821
} /* if */
822
return retval;
823
824
825
} /* tryOpenDir */
826
static DirHandle *openDirectory(PHYSFS_Io *io, const char *d, int forWriting)
827
{
828
DirHandle *retval = NULL;
829
const PHYSFS_Archiver **i;
830
const char *ext;
831
int created_io = 0;
832
833
assert((io != NULL) || (d != NULL));
834
835
836
837
if (io == NULL)
{
/* DIR gets first shot (unlike the rest, it doesn't deal with files). */
838
extern const PHYSFS_Archiver __PHYSFS_Archiver_DIR;
839
840
841
842
843
retval = tryOpenDir(io, &__PHYSFS_Archiver_DIR, d, forWriting);
if (retval != NULL)
return retval;
io = __PHYSFS_createNativeIo(d, forWriting ? 'w' : 'r');
844
BAIL_IF_ERRPASS(!io, 0);
845
created_io = 1;
846
} /* if */
847
848
849
ext = find_filename_extension(d);
if (ext != NULL)
850
{
851
/* Look for archivers with matching file extensions first... */
852
for (i = archivers; (*i != NULL) && (retval == NULL); i++)
853
{
854
if (__PHYSFS_utf8stricmp(ext, (*i)->info.extension) == 0)
855
retval = tryOpenDir(io, *i, d, forWriting);
856
857
858
} /* for */
/* failing an exact file extension match, try all the others... */
859
for (i = archivers; (*i != NULL) && (retval == NULL); i++)
860
{
861
if (__PHYSFS_utf8stricmp(ext, (*i)->info.extension) != 0)
862
retval = tryOpenDir(io, *i, d, forWriting);
863
864
865
866
867
} /* for */
} /* if */
else /* no extension? Try them all. */
{
868
for (i = archivers; (*i != NULL) && (retval == NULL); i++)
869
retval = tryOpenDir(io, *i, d, forWriting);
870
} /* else */
871
872
873
874
if ((!retval) && (created_io))
io->destroy(io);
875
BAIL_IF(!retval, PHYSFS_ERR_UNSUPPORTED, NULL);
876
return retval;
877
878
879
} /* openDirectory */
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
/*
* Make a platform-independent path string sane. Doesn't actually check the
* file hierarchy, it just cleans up the string.
* (dst) must be a buffer at least as big as (src), as this is where the
* cleaned up string is deposited.
* If there are illegal bits in the path (".." entries, etc) then we
* return zero and (dst) is undefined. Non-zero if the path was sanitized.
*/
static int sanitizePlatformIndependentPath(const char *src, char *dst)
{
char *prev;
char ch;
while (*src == '/') /* skip initial '/' chars... */
src++;
prev = dst;
do
{
ch = *(src++);
if ((ch == ':') || (ch == '\\')) /* illegal chars in a physfs path. */
902
BAIL(PHYSFS_ERR_BAD_FILENAME, 0);
903
904
905
906
907
if (ch == '/') /* path separator. */
{
*dst = '\0'; /* "." and ".." are illegal pathnames. */
if ((strcmp(prev, ".") == 0) || (strcmp(prev, "..") == 0))
908
BAIL(PHYSFS_ERR_BAD_FILENAME, 0);
909
910
911
912
913
914
915
916
917
918
919
920
921
while (*src == '/') /* chop out doubles... */
src++;
if (*src == '\0') /* ends with a pathsep? */
break; /* we're done, don't add final pathsep to dst. */
prev = dst + 1;
} /* if */
*(dst++) = ch;
} while (ch != '\0');
922
return 1;
923
924
925
} /* sanitizePlatformIndependentPath */
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
/*
* Figure out if (fname) is part of (h)'s mountpoint. (fname) must be an
* output from sanitizePlatformIndependentPath(), so that it is in a known
* state.
*
* This only finds legitimate segments of a mountpoint. If the mountpoint is
* "/a/b/c" and (fname) is "/a/b/c", "/", or "/a/b/c/d", then the results are
* all zero. "/a/b" will succeed, though.
*/
static int partOfMountPoint(DirHandle *h, char *fname)
{
/* !!! FIXME: This code feels gross. */
int rc;
size_t len, mntpntlen;
if (h->mountPoint == NULL)
942
return 0;
943
else if (*fname == '\0')
944
return 1;
945
946
947
948
len = strlen(fname);
mntpntlen = strlen(h->mountPoint);
if (len > mntpntlen) /* can't be a subset of mountpoint. */
949
return 0;
950
951
952
/* if true, must be not a match or a complete match, but not a subset. */
if ((len + 1) == mntpntlen)
953
return 0;
954
955
956
rc = strncmp(fname, h->mountPoint, len); /* !!! FIXME: case insensitive? */
if (rc != 0)
957
return 0; /* not a match. */
958
959
/* make sure /a/b matches /a/b/ and not /a/bc ... */
960
return h->mountPoint[len] == '/';
961
962
963
} /* partOfMountPoint */
964
965
static DirHandle *createDirHandle(PHYSFS_Io *io, const char *newDir,
const char *mountPoint, int forWriting)
966
967
{
DirHandle *dirHandle = NULL;
968
char *tmpmntpnt = NULL;
969
970
971
if (mountPoint != NULL)
{
972
973
const size_t len = strlen(mountPoint) + 1;
tmpmntpnt = (char *) __PHYSFS_smallAlloc(len);
974
GOTO_IF(!tmpmntpnt, PHYSFS_ERR_OUT_OF_MEMORY, badDirHandle);
975
if (!sanitizePlatformIndependentPath(mountPoint, tmpmntpnt))
976
goto badDirHandle;
977
mountPoint = tmpmntpnt; /* sanitized version. */
978
} /* if */
979
980
dirHandle = openDirectory(io, newDir, forWriting);
981
GOTO_IF_ERRPASS(!dirHandle, badDirHandle);
982
983
984
985
986
987
if (newDir == NULL)
dirHandle->dirName = NULL;
else
{
dirHandle->dirName = (char *) allocator.Malloc(strlen(newDir) + 1);
988
if (!dirHandle->dirName)
989
GOTO(PHYSFS_ERR_OUT_OF_MEMORY, badDirHandle);
990
991
strcpy(dirHandle->dirName, newDir);
} /* else */
992
993
994
if ((mountPoint != NULL) && (*mountPoint != '\0'))
{
995
dirHandle->mountPoint = (char *)allocator.Malloc(strlen(mountPoint)+2);
996
if (!dirHandle->mountPoint)
997
GOTO(PHYSFS_ERR_OUT_OF_MEMORY, badDirHandle);
998
999
1000
strcpy(dirHandle->mountPoint, mountPoint);
strcat(dirHandle->mountPoint, "/");
} /* if */