rwops.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2013-2019 The ManaPlus Developers
 * Copyright (C) 2009-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
/*
 * 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 falls under the LGPL license. You can get SDL at http://www.libsdl.org/
 *
 * This file was written by Ryan C. Gordon. ([email protected]).
 *
 * Copyright (C) 2012-2019 The ManaPlus Developers
 * Copyright (C) 2009-2021 Andrei Karas
 */
 
#include "fs/virtfs/rwops.h"
 
#include "fs/virtfs/file.h"
#include "fs/virtfs/fs.h"
#include "fs/virtfs/fsfuncs.h"
 
#include "utils/checkutils.h"
#include "utils/fuzzer.h"
 
PRAGMA48(GCC diagnostic push)
PRAGMA48(GCC diagnostic ignored "-Wshadow")
#include <SDL_rwops.h>
PRAGMA48(GCC diagnostic pop)
 
#include "debug.h"
 
namespace VirtFs
{
 
SDL_RWops *create_rwops(File *const file,
 const std::string &restrict fname)
{
 SDL_RWops *retval = nullptr;
 
 if (file == nullptr)
 {
 reportAlways("VirtFs::rwops_seek: create rwops error: %s",
 fname.c_str())
 }
 else
 {
 retval = SDL_AllocRW();
 if (retval != nullptr)
 {
#ifdef USE_SDL2
 retval->size = file->funcs->rwops_size;
#endif // USE_SDL2
 
 retval->seek = file->funcs->rwops_seek;
 retval->read = file->funcs->rwops_read;
 retval->write = file->funcs->rwops_write;
 retval->close = file->funcs->rwops_close;
 retval->hidden.unknown.data1 = file;
 } /* if */
 } /* else */
 
 return retval;
} /* VirtFs::create_rwops */
 
#ifdef __APPLE__
static bool checkFilePath(const std::string &restrict fname)
{
 if (fname.empty())
 return false;
 if (!exists(fname) || isDirectory(fname))
 return false;
 return true;
}
#endif // __APPLE__
 
SDL_RWops *rwopsOpenRead(const std::string &restrict fname)
{
 BLOCK_START("RWopsopenRead")
#ifdef __APPLE__
 if (!checkFilePath(fname))
 return nullptr;
#endif // __APPLE__
#ifdef USE_FUZZER
 if (Fuzzer::conditionTerminate(fname))
 return nullptr;
#endif // USE_FUZZER
#ifdef USE_PROFILER
 
 SDL_RWops *const ret = create_rwops(openRead(fname),
 fname);
 
 BLOCK_END("RWopsopenRead")
 return ret;
#else // USE_PROFILER
 
 return create_rwops(openRead(fname),
 fname);
#endif // USE_PROFILER
} /* RWopsopenRead */
 
SDL_RWops *rwopsOpenWrite(const std::string &restrict fname)
{
#ifdef __APPLE__
 if (!checkFilePath(fname))
 return nullptr;
#endif // __APPLE__
 
 return create_rwops(openWrite(fname),
 fname);
} /* RWopsopenWrite */
 
SDL_RWops *rwopsOpenAppend(const std::string &restrict fname)
{
#ifdef __APPLE__
 if (!checkFilePath(fname))
 return nullptr;
#endif // __APPLE__
 
 return create_rwops(openAppend(fname),
 fname);
} /* RWopsopenAppend */
 
} // namespace VirtFs
 
/* end of virtfsrwops.c ... */