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physfsrwops.c
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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.
*
* Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
* General Public License: http://www.gnu.org/licenses/lgpl.txt
*
* SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
*
* This file was written by Ryan C. Gordon. (icculus@clutteredmind.org).
*/
#include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
#include "physfsrwops.h"
static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
{
PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
int pos = 0;
if (whence == SEEK_SET)
{
pos = offset;
} /* if */
else if (whence == SEEK_CUR)
{
PHYSFS_sint64 current = PHYSFS_tell(handle);
if (current == -1)
{
SDL_SetError("Can't find position in file: %s",
PHYSFS_getLastError());
return(-1);
} /* if */
pos = (int) current;
if ( ((PHYSFS_sint64) pos) != current )
{
SDL_SetError("Can't fit current file position in an int!");
return(-1);
} /* if */
if (offset == 0) /* this is a "tell" call. We're done. */
return(pos);
pos += offset;
} /* else if */
else if (whence == SEEK_END)
{
PHYSFS_sint64 len = PHYSFS_fileLength(handle);
if (len == -1)
{
SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
return(-1);
} /* if */
pos = (int) len;
if ( ((PHYSFS_sint64) pos) != len )
{
SDL_SetError("Can't fit end-of-file position in an int!");
return(-1);
} /* if */
pos += 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 */
return(pos);
} /* physfsrwops_seek */
static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
{
PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum);
if (rc != maxnum)
{
if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
} /* if */
return((int) rc);
} /* physfsrwops_read */
static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
{
PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num);
if (rc != num)
SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
return((int) rc);
} /* 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)
{
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 ... */