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physfs/extras/physfsrwops.c

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/*
* This code provides a glue layer between PhysicsFS and Simple Directmedia
* Layer's (SDL) RWops i/o abstraction.
*
* License: this code is public domain. I make no warranty that it is useful,
* correct, harmless, or environmentally safe.
*
* This particular file may be used however you like, including copying it
* verbatim into a closed-source project, exploiting it commercially, and
* removing any trace of my name from the source (although I hope you won't
* do that). I welcome enhancements and corrections to this file, but I do
* not require you to send me patches if you make changes. This code has
* NO WARRANTY.
*
* Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
* Please see LICENSE.txt in the root of the source tree.
*
* SDL 1.2 falls under the LGPL license. SDL 1.3+ is zlib, like PhysicsFS.
* You can get SDL at https://www.libsdl.org/
*
* This file was written by Ryan C. Gordon. (icculus@icculus.org).
*/
#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
#include "physfsrwops.h"
/* SDL's RWOPS interface changed a little in SDL 2.0... */
#if defined(SDL_VERSION_ATLEAST)
#if SDL_VERSION_ATLEAST(2, 0, 0)
#define TARGET_SDL2 1
#endif
#endif
#if !TARGET_SDL2
#define RW_SEEK_SET SEEK_SET
#define RW_SEEK_CUR SEEK_CUR
#define RW_SEEK_END SEEK_END
#endif
#if TARGET_SDL2
static Sint64 SDLCALL physfsrwops_size(struct SDL_RWops *rw)
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
return (Sint64) PHYSFS_fileLength(handle);
} /* physfsrwops_size */
#endif
#if TARGET_SDL2
static Sint64 SDLCALL physfsrwops_seek(struct SDL_RWops *rw, Sint64 offset, int whence)
#else
static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
PHYSFS_sint64 pos = 0;
if (whence == RW_SEEK_SET)
pos = (PHYSFS_sint64) offset;
else if (whence == RW_SEEK_CUR)
{
const PHYSFS_sint64 current = PHYSFS_tell(handle);
if (current == -1)
{
SDL_SetError("Can't find position in file: %s",
PHYSFS_getLastError());
return -1;
} /* if */
if (offset == 0) /* this is a "tell" call. We're done. */
{
#if TARGET_SDL2
return (Sint64) current;
#else
return (int) current;
#endif
} /* if */
pos = current + ((PHYSFS_sint64) offset);
} /* else if */
else if (whence == RW_SEEK_END)
{
const PHYSFS_sint64 len = PHYSFS_fileLength(handle);
if (len == -1)
{
SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
return -1;
} /* if */
pos = len + ((PHYSFS_sint64) offset);
} /* else if */
else
{
SDL_SetError("Invalid 'whence' parameter.");
return -1;
} /* else */
if ( pos < 0 )
{
SDL_SetError("Attempt to seek past start of file.");
return -1;
} /* if */
if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos))
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
return -1;
} /* if */
#if TARGET_SDL2
return (Sint64) pos;
#else
return (int) pos;
#endif
} /* physfsrwops_seek */
#if TARGET_SDL2
static size_t SDLCALL physfsrwops_read(struct SDL_RWops *rw, void *ptr,
size_t size, size_t maxnum)
#else
static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
const PHYSFS_uint64 readlen = (PHYSFS_uint64) (maxnum * size);
const PHYSFS_sint64 rc = PHYSFS_readBytes(handle, ptr, readlen);
if (rc != ((PHYSFS_sint64) readlen))
{
if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
#if TARGET_SDL2
return 0;
#else
return -1;
#endif
} /* if */
} /* if */
#if TARGET_SDL2
return (size_t) rc / size;
#else
return (int) rc / size;
#endif
} /* physfsrwops_read */
#if TARGET_SDL2
static size_t SDLCALL physfsrwops_write(struct SDL_RWops *rw, const void *ptr,
size_t size, size_t num)
#else
static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
#endif
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
const PHYSFS_uint64 writelen = (PHYSFS_uint64) (num * size);
const PHYSFS_sint64 rc = PHYSFS_writeBytes(handle, ptr, writelen);
if (rc != ((PHYSFS_sint64) writelen))
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
#if TARGET_SDL2
return (size_t) rc;
#else
return (int) rc;
#endif
} /* physfsrwops_write */
static int physfsrwops_close(SDL_RWops *rw)
{
PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
if (!PHYSFS_close(handle))
{
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
return -1;
} /* if */
SDL_FreeRW(rw);
return 0;
} /* physfsrwops_close */
static SDL_RWops *create_rwops(PHYSFS_File *handle)
{
SDL_RWops *retval = NULL;
if (handle == NULL)
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
else
{
retval = SDL_AllocRW();
if (retval != NULL)
{
#if TARGET_SDL2
retval->size = physfsrwops_size;
#endif
retval->seek = physfsrwops_seek;
retval->read = physfsrwops_read;
retval->write = physfsrwops_write;
retval->close = physfsrwops_close;
retval->hidden.unknown.data1 = handle;
} /* if */
} /* else */
return retval;
} /* create_rwops */
SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_File *handle)
{
SDL_RWops *retval = NULL;
if (handle == NULL)
SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
else
retval = create_rwops(handle);
return retval;
} /* PHYSFSRWOPS_makeRWops */
SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
{
return create_rwops(PHYSFS_openRead(fname));
} /* PHYSFSRWOPS_openRead */
SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
{
return create_rwops(PHYSFS_openWrite(fname));
} /* PHYSFSRWOPS_openWrite */
SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
{
return create_rwops(PHYSFS_openAppend(fname));
} /* PHYSFSRWOPS_openAppend */
/* end of physfsrwops.c ... */
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