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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. 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 "utils/physfsrwops.h"
#include "logger.h"
#include "utils/fuzzer.h"
#include "utils/physfscheckutils.h"
#include "debug.h"
#ifdef USE_SDL2
#define PHYSFSINT int64_t
#define PHYSFSSIZE size_t
#else // USE_SDL2
#define PHYSFSINT int32_t
#define PHYSFSSIZE int
#endif // USE_SDL2
#ifdef DUMP_LEAKED_RESOURCES
static int openedRWops = 0;
#endif // DUMP_LEAKED_RESOURCES
static PHYSFSINT physfsrwops_seek(SDL_RWops *const rw, const PHYSFSINT offset,
const int whence)
{
if (!rw)
return -1;
PHYSFS_file *const handle = static_cast<PHYSFS_file *const>(
rw->hidden.unknown.data1);
PHYSFSINT 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(
"physfsrwops_seek: Can't find position in file: %s",
VirtFs::getLastError());
return -1;
} /* if */
pos = CAST_S32(current);
if (static_cast<int64_t>(pos) != current)
{
logger->assertLog("physfsrwops_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("physfsrwops_seek:Can't find end of file: %s",
VirtFs::getLastError());
return -1;
} /* if */
pos = static_cast<PHYSFSINT>(len);
if (static_cast<int64_t>(pos) != len)
{
logger->assertLog("physfsrwops_seek: "
"Can't fit end-of-file position in an int!");
return -1;
} /* if */
pos += offset;
} /* else if */
else
{
logger->assertLog("physfsrwops_seek: Invalid 'whence' parameter.");
return -1;
} /* else */
if (pos < 0)
{
logger->assertLog("physfsrwops_seek: "
"Attempt to seek past start of file.");
return -1;
} /* if */
if (!VirtFs::seek(handle, static_cast<uint64_t>(pos)))
{
logger->assertLog("physfsrwops_seek: seek error: %s",
VirtFs::getLastError());
return -1;
} /* if */
return pos;
} /* physfsrwops_seek */
static PHYSFSSIZE physfsrwops_read(SDL_RWops *const rw,
void *ptr,
const PHYSFSSIZE size,
const PHYSFSSIZE maxnum)
{
if (!rw)
return 0;
PHYSFS_file *const handle = static_cast<PHYSFS_file *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("physfsrwops_seek: read error: %s",
PHYSFS_getLastError());
}
} /* if */
return CAST_S32(rc);
} /* physfsrwops_read */
static PHYSFSSIZE physfsrwops_write(SDL_RWops *const rw, const void *ptr,
const PHYSFSSIZE size,
const PHYSFSSIZE num)
{
if (!rw)
return 0;
PHYSFS_file *const handle = static_cast<PHYSFS_file *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("physfsrwops_seek: write error: %s",
PHYSFS_getLastError());
}
return CAST_S32(rc);
} /* physfsrwops_write */
static int physfsrwops_close(SDL_RWops *const rw)
{
if (!rw)
return 0;
PHYSFS_file *const handle = static_cast<PHYSFS_file*>(
rw->hidden.unknown.data1);
if (!VirtFs::close(handle))
{
logger->assertLog("physfsrwops_seek: close error: %s",
VirtFs::getLastError());
return -1;
} /* if */
SDL_FreeRW(rw);
#ifdef DUMP_LEAKED_RESOURCES
if (openedRWops <= 0)
logger->assertLog("physfsrwops_seek: closing already closed RWops");
openedRWops --;
#endif // DUMP_LEAKED_RESOURCES
#ifdef DEBUG_PHYSFS
FakePhysFSClose(rw);
#endif // DEBUG_PHYSFS
return 0;
} /* physfsrwops_close */
#ifdef USE_SDL2
static PHYSFSINT physfsrwops_size(SDL_RWops *const rw)
{
PHYSFS_file *const handle = static_cast<PHYSFS_file*>(
rw->hidden.unknown.data1);
return VirtFs::fileLength(handle);
} /* physfsrwops_size */
#endif // USE_SDL2
static SDL_RWops *create_rwops(PHYSFS_file *const handle)
{
SDL_RWops *retval = nullptr;
if (!handle)
{
logger->assertLog("physfsrwops_seek: create rwops error: %s",
VirtFs::getLastError());
}
else
{
retval = SDL_AllocRW();
if (retval)
{
#ifdef USE_SDL2
retval->size = &physfsrwops_size;
#endif // USE_SDL2
retval->seek = &physfsrwops_seek;
retval->read = &physfsrwops_read;
retval->write = &physfsrwops_write;
retval->close = &physfsrwops_close;
retval->hidden.unknown.data1 = handle;
} /* if */
#ifdef DUMP_LEAKED_RESOURCES
openedRWops ++;
#endif // DUMP_LEAKED_RESOURCES
} /* else */
return retval;
} /* create_rwops */
SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *const handle)
{
SDL_RWops *retval = nullptr;
if (!handle)
{
logger->assertLog("physfsrwops_seek: NULL pointer passed to "
"PHYSFSRWOPS_makeRWops().");
}
else
{
retval = create_rwops(handle);
}
return retval;
} /* PHYSFSRWOPS_makeRWops */
#ifdef __APPLE__
static bool checkFilePath(const char *const fname)
{
if (!fname || !*fname)
return false;
if (!VirtFs::exists(fname) || VirtFs::isDirectory(fname))
return false;
return true;
}
#endif // __APPLE__
SDL_RWops *PHYSFSRWOPS_openRead(const char *const fname)
{
BLOCK_START("PHYSFSRWOPS_openRead")
#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("PHYSFSRWOPS_openRead")
return ret;
#else // USE_PROFILER
return create_rwops(VirtFs::openRead(fname));
#endif // USE_PROFILER
} /* PHYSFSRWOPS_openRead */
SDL_RWops *PHYSFSRWOPS_openWrite(const char *const fname)
{
#ifdef __APPLE__
if (!checkFilePath(fname))
return nullptr;
#endif // __APPLE__
return create_rwops(VirtFs::openWrite(fname));
} /* PHYSFSRWOPS_openWrite */
SDL_RWops *PHYSFSRWOPS_openAppend(const char *const fname)
{
#ifdef __APPLE__
if (!checkFilePath(fname))
return nullptr;
#endif // __APPLE__
return create_rwops(VirtFs::openAppend(fname));
} /* PHYSFSRWOPS_openAppend */
#ifdef DUMP_LEAKED_RESOURCES
void reportRWops()
{
if (openedRWops)
{
logger->assertLog("physfsrwops_seek: leaking RWops: %d",
openedRWops);
}
}
#endif // DUMP_LEAKED_RESOURCES
/* end of physfsrwops.c ... */
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