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/*
* The ManaPlus Client
* Copyright (C) 2013-2017 The ManaPlus Developers
*
* 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. (icculus@icculus.org).
*
* Copyright (C) 2012-2017 The ManaPlus Developers
*/
#include "fs/virtfs/virtfsrwops.h"
#include "logger.h"
#include "fs/virtfs/virtfs.h"
#include "utils/fuzzer.h"
#include "debug.h"
#ifdef USE_SDL2
#define RWOPSINT int64_t
#define RWOPSSIZE size_t
#else // USE_SDL2
#define RWOPSINT int32_t
#define RWOPSSIZE int
#endif // USE_SDL2
static RWOPSINT virtfsrwops_seek(SDL_RWops *const rw,
const RWOPSINT offset,
const int whence)
{
if (!rw)
return -1;
VirtFile *const handle = static_cast<VirtFile *const>(
rw->hidden.unknown.data1);
RWOPSINT pos = 0;
if (whence == SEEK_SET)
{
pos = offset;
} /* if */
else if (whence == SEEK_CUR)
{
const int64_t current = VirtFs::tell(handle);
if (current == -1)
{
logger->assertLog(
"virtfsrwops_seek: Can't find position in file.");
return -1;
} /* if */
pos = CAST_S32(current);
if (static_cast<int64_t>(pos) != current)
{
logger->assertLog("virtfsrwops_seek: "
"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)
{
const int64_t len = VirtFs::fileLength(handle);
if (len == -1)
{
logger->assertLog("virtfsrwops_seek:Can't find end of file.");
return -1;
} /* if */
pos = static_cast<RWOPSINT>(len);
if (static_cast<int64_t>(pos) != len)
{
logger->assertLog("virtfsrwops_seek: "
"Can't fit end-of-file position in an int!");
return -1;
} /* if */
pos += offset;
} /* else if */
else
{
logger->assertLog("virtfsrwops_seek: Invalid 'whence' parameter.");
return -1;
} /* else */
if (pos < 0)
{
logger->assertLog("virtfsrwops_seek: "
"Attempt to seek past start of file.");
return -1;
} /* if */
if (!VirtFs::seek(handle, static_cast<uint64_t>(pos)))
{
logger->assertLog("virtfsrwops_seek: seek error.");
return -1;
} /* if */
return pos;
} /* virtfsrwops_seek */
static RWOPSSIZE virtfsrwops_read(SDL_RWops *const rw,
void *const ptr,
const RWOPSSIZE size,
const RWOPSSIZE maxnum)
{
if (!rw)
return 0;
VirtFile *const handle = static_cast<VirtFile *const>(
rw->hidden.unknown.data1);
const int64_t rc = VirtFs::read(handle, ptr,
CAST_U32(size),
CAST_U32(maxnum));
if (rc != static_cast<int64_t>(maxnum))
{
if (!VirtFs::eof(handle)) /* not EOF? Must be an error. */
{
logger->assertLog("virtfsrwops_seek: read error.");
}
} /* if */
return CAST_S32(rc);
} /* virtfsrwops_read */
static RWOPSSIZE virtfsrwops_write(SDL_RWops *const rw,
const void *const ptr,
const RWOPSSIZE size,
const RWOPSSIZE num)
{
if (!rw)
return 0;
VirtFile *const handle = static_cast<VirtFile *const>(
rw->hidden.unknown.data1);
const int64_t rc = VirtFs::write(handle, ptr,
CAST_U32(size),
CAST_U32(num));
if (rc != static_cast<int64_t>(num))
{
logger->assertLog("virtfsrwops_seek: write error.");
}
return CAST_S32(rc);
} /* virtfsrwops_write */
static int virtfsrwops_close(SDL_RWops *const rw)
{
if (!rw)
return 0;
VirtFile *const handle = static_cast<VirtFile*>(
rw->hidden.unknown.data1);
if (!VirtFs::close(handle))
{
logger->assertLog("virtfsrwops_seek: close error.");
return -1;
} /* if */
SDL_FreeRW(rw);
return 0;
} /* virtfsrwops_close */
#ifdef USE_SDL2
static RWOPSINT virtfsrwops_size(SDL_RWops *const rw)
{
VirtFile *const handle = static_cast<VirtFile *const>(
rw->hidden.unknown.data1);
return VirtFs::fileLength(handle);
} /* virtfsrwops_size */
#endif // USE_SDL2
static SDL_RWops *create_rwops(VirtFile *const file)
{
SDL_RWops *retval = nullptr;
if (!file)
{
logger->assertLog("virtfsrwops_seek: create rwops error.");
}
else
{
retval = SDL_AllocRW();
if (retval)
{
#ifdef USE_SDL2
retval->size = &virtfsrwops_size;
#endif // USE_SDL2
retval->seek = &virtfsrwops_seek;
retval->read = &virtfsrwops_read;
retval->write = &virtfsrwops_write;
retval->close = &virtfsrwops_close;
retval->hidden.unknown.data1 = file;
} /* if */
} /* else */
return retval;
} /* create_rwops */
SDL_RWops *VirtFs::MakeRWops(VirtFile *const handle)
{
SDL_RWops *retval = nullptr;
if (!handle)
{
logger->assertLog("virtfsrwops_seek: NULL pointer passed to "
"RWopsmakeRWops().");
}
else
{
retval = create_rwops(handle);
}
return retval;
} /* RWopsmakeRWops */
#ifdef __APPLE__
static bool checkFilePath(const std::string &restrict fname)
{
if (fname.empty())
return false;
if (!VirtFs::exists(fname) || VirtFs::isDirectory(fname))
return false;
return true;
}
#endif // __APPLE__
SDL_RWops *VirtFs::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(VirtFs::openRead(fname));
BLOCK_END("RWopsopenRead")
return ret;
#else // USE_PROFILER
return create_rwops(VirtFs::openRead(fname));
#endif // USE_PROFILER
} /* RWopsopenRead */
SDL_RWops *VirtFs::RWopsOpenWrite(const std::string &restrict fname)
{
#ifdef __APPLE__
if (!checkFilePath(fname))
return nullptr;
#endif // __APPLE__
return create_rwops(VirtFs::openWrite(fname));
} /* RWopsopenWrite */
SDL_RWops *VirtFs::RWopsOpenAppend(const std::string &restrict fname)
{
#ifdef __APPLE__
if (!checkFilePath(fname))
return nullptr;
#endif // __APPLE__
return create_rwops(VirtFs::openAppend(fname));
} /* RWopsopenAppend */
/* end of virtfsrwops.c ... */
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