extras/physfsrwops.c
author David Yip <dwyip@peach-bun.com>
Mon, 15 Aug 2016 00:50:58 -0500
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child 1629 540be489d50f
permissions -rw-r--r--
Remove unused variable in zip_hash_ancestors. Under gcc 5.4.0, this generates unused variable warnings, which in combination with -Werror causes a compile error.
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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. This code has
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 *  NO WARRANTY.
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 *
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 * Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
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 *  Please see LICENSE.txt in the root of the source tree.
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 *
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 * SDL 1.2 falls under the LGPL license. SDL 1.3+ is zlib, like PhysicsFS.
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 *  You can get SDL at https://www.libsdl.org/
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 *
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 *  This file was written by Ryan C. Gordon. (icculus@icculus.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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/* SDL's RWOPS interface changed a little in SDL 2.0... */
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#if defined(SDL_VERSION_ATLEAST)
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#if SDL_VERSION_ATLEAST(2, 0, 0)
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#define TARGET_SDL2 1
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#endif
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#endif
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#if !TARGET_SDL2
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#define RW_SEEK_SET SEEK_SET
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#define RW_SEEK_CUR SEEK_CUR
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#define RW_SEEK_END SEEK_END
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#endif
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#if TARGET_SDL2
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static Sint64 SDLCALL physfsrwops_size(struct SDL_RWops *rw)
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{
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    PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
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    return (Sint64) PHYSFS_fileLength(handle);
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} /* physfsrwops_size */
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#endif
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#if TARGET_SDL2
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static Sint64 SDLCALL physfsrwops_seek(struct SDL_RWops *rw, Sint64 offset, int whence)
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#else
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static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
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#endif
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{
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    PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
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    PHYSFS_sint64 pos = 0;
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    if (whence == RW_SEEK_SET)
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        pos = (PHYSFS_sint64) offset;
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    else if (whence == RW_SEEK_CUR)
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    {
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        const 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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        if (offset == 0)  /* this is a "tell" call. We're done. */
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        {
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            #if TARGET_SDL2
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            return (Sint64) current;
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            #else
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            return (int) current;
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            #endif
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        } /* if */
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        pos = current + ((PHYSFS_sint64) offset);
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    } /* else if */
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    else if (whence == RW_SEEK_END)
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    {
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        const 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 = len + ((PHYSFS_sint64) 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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    #if TARGET_SDL2
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    return (Sint64) pos;
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    #else
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    return (int) pos;
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    #endif
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} /* physfsrwops_seek */
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#if TARGET_SDL2
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static size_t SDLCALL physfsrwops_read(struct SDL_RWops *rw, void *ptr,
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                                       size_t size, size_t maxnum)
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#else
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static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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#endif
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{
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    PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
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    const PHYSFS_uint64 readlen = (PHYSFS_uint64) (maxnum * size);
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    const PHYSFS_sint64 rc = PHYSFS_readBytes(handle, ptr, readlen);
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    if (rc != ((PHYSFS_sint64) readlen))
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    {
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        if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
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        {
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            SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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            #if TARGET_SDL2
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            return 0;
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            #else
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            return -1;
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            #endif
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        } /* if */
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    } /* if */
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    #if TARGET_SDL2
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    return (size_t) rc / size;
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    #else
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    return (int) rc / size;
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    #endif
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} /* physfsrwops_read */
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#if TARGET_SDL2
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static size_t SDLCALL physfsrwops_write(struct SDL_RWops *rw, const void *ptr,
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                                        size_t size, size_t num)
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#else
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static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
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#endif
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{
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    PHYSFS_File *handle = (PHYSFS_File *) rw->hidden.unknown.data1;
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    const PHYSFS_uint64 writelen = (PHYSFS_uint64) (num * size);
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    const PHYSFS_sint64 rc = PHYSFS_writeBytes(handle, ptr, writelen);
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    if (rc != ((PHYSFS_sint64) writelen))
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        SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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    #if TARGET_SDL2
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    return (size_t) rc;
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    #else
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    return (int) rc;
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    #endif
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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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            #if TARGET_SDL2
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            retval->size  = physfsrwops_size;
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            #endif
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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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