extras/physfsrwops.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 24 Mar 2002 19:47:33 +0000
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child 576 5da65f8e9a50
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Added typedefs and platform-specific i/o.
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/*
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 * This code provides a glue layer between PhysicsFS and Simple Directmedia
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 *  Layer's (SDL) RWops i/o abstraction.
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 *
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 * License: this code is public domain. I make no warranty that it is useful,
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 *  correct, harmless, or environmentally safe.
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 *
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 * This particular file may be used however you like, including copying it
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 *  verbatim into a closed-source project, exploiting it commercially, and
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 *  removing any trace of my name from the source (although I hope you won't
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 *  do that). I welcome enhancements and corrections to this file, but I do
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 *  not require you to send me patches if you make changes.
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 *
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 * Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
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 *  General Public License: http://www.gnu.org/licenses/lgpl.txt
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 *
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 * SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
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 *
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 *  This file was written by Ryan C. Gordon. (icculus@clutteredmind.org).
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 */
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#include <stdio.h>  /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
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#include "physfsrwops.h"
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static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
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{
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    PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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    int pos = 0;
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    if (whence == SEEK_SET)
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    {
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        pos = offset;
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    } /* if */
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    else if (whence == SEEK_CUR)
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    {
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        PHYSFS_sint64 current = PHYSFS_tell(handle);
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        if (current == -1)
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        {
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            SDL_SetError("Can't find position in file: %s",
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                          PHYSFS_getLastError());
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            return(-1);
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        } /* if */
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        pos = (int) current;
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        if ( ((PHYSFS_sint64) pos) != current )
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        {
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            SDL_SetError("Can't fit current file position in an int!");
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            return(-1);
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        } /* if */
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        if (offset == 0)  /* this is a "tell" call. We're done. */
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            return(pos);
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        pos += offset;
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    } /* else if */
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    else if (whence == SEEK_END)
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    {
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        PHYSFS_sint64 len = PHYSFS_fileLength(handle);
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        if (len == -1)
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        {
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            SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
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            return(-1);
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        } /* if */
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        pos = (int) len;
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        if ( ((PHYSFS_sint64) pos) != len )
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        {
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            SDL_SetError("Can't fit end-of-file position in an int!");
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            return(-1);
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        } /* if */
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        pos += offset;
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    } /* else if */
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    else
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    {
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        SDL_SetError("Invalid 'whence' parameter.");
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        return(-1);
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    } /* else */
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    if ( pos < 0 )
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    {
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        SDL_SetError("Attempt to seek past start of file.");
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        return(-1);
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    } /* if */
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    if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos))
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    {
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        SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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        return(-1);
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    } /* if */
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    return(pos);
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} /* physfsrwops_seek */
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static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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{
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    PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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    PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum);
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    if (rc != maxnum)
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    {
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        if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
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            SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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    } /* if */
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    return((int) rc);
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} /* physfsrwops_read */
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static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
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{
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    PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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    PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num);
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    if (rc != num)
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        SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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    return((int) rc);
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} /* physfsrwops_write */
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static int physfsrwops_close(SDL_RWops *rw)
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{
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    PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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    if (!PHYSFS_close(handle))
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    {
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        SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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        return(-1);
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    } /* if */
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    SDL_FreeRW(rw);
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    return(0);
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} /* physfsrwops_close */
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static SDL_RWops *create_rwops(PHYSFS_file *handle)
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{
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    SDL_RWops *retval = NULL;
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    if (handle == NULL)
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        SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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    else
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    {
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        retval = SDL_AllocRW();
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        if (retval != NULL)
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        {
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            retval->seek  = physfsrwops_seek;
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            retval->read  = physfsrwops_read;
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            retval->write = physfsrwops_write;
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            retval->close = physfsrwops_close;
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            retval->hidden.unknown.data1 = handle;
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        } /* if */
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    } /* else */
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    return(retval);
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} /* create_rwops */
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SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle)
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{
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    SDL_RWops *retval = NULL;
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    if (handle == NULL)
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        SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
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    else
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        retval = create_rwops(handle);
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    return(retval);
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} /* PHYSFSRWOPS_makeRWops */
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SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
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{
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    return(create_rwops(PHYSFS_openRead(fname)));
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} /* PHYSFSRWOPS_openRead */
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SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
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{
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    return(create_rwops(PHYSFS_openWrite(fname)));
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} /* PHYSFSRWOPS_openWrite */
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SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
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{
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    return(create_rwops(PHYSFS_openAppend(fname)));
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} /* PHYSFSRWOPS_openAppend */
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/* end of physfsrwops.c ... */
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