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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/>.
*/
#include "fs/virtfs/virtfsdirrwops.h"
#include "logger.h"
#include "fs/virtfs/virtfile.h"
#include "fs/virtfs/virtfs.h"
#include <SDL_rwops.h>
#include "debug.h"
namespace VirtFsDir
{
RWOPSINT rwops_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;
}
else if (whence == SEEK_CUR)
{
const int64_t current = VirtFs::tell(handle);
if (current == -1)
{
logger->assertLog(
"VirtFs::rwops_seek: Can't find position in file.");
return -1;
}
pos = CAST_S32(current);
if (static_cast<int64_t>(pos) != current)
{
logger->assertLog("VirtFs::rwops_seek: "
"Can't fit current file position in an int!");
return -1;
}
if (offset == 0) /* this is a "tell" call. We're done. */
return pos;
pos += offset;
}
else if (whence == SEEK_END)
{
const int64_t len = VirtFs::fileLength(handle);
if (len == -1)
{
logger->assertLog(
"VirtFs::rwops_seek:Can't find end of file.");
return -1;
}
pos = static_cast<RWOPSINT>(len);
if (static_cast<int64_t>(pos) != len)
{
logger->assertLog("VirtFs::rwops_seek: "
"Can't fit end-of-file position in an int!");
return -1;
}
pos += offset;
}
else
{
logger->assertLog(
"VirtFs::rwops_seek: Invalid 'whence' parameter.");
return -1;
}
if (pos < 0)
{
logger->assertLog("VirtFs::rwops_seek: "
"Attempt to seek past start of file.");
return -1;
}
if (!VirtFs::seek(handle, static_cast<uint64_t>(pos)))
{
logger->assertLog("VirtFs::rwops_seek: seek error.");
return -1;
}
return pos;
}
RWOPSSIZE rwops_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("VirtFs::rwops_seek: read error.");
}
}
return CAST_S32(rc);
}
RWOPSSIZE rwops_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("VirtFs::rwops_seek: write error.");
}
return CAST_S32(rc);
}
int rwops_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("VirtFs::rwops_seek: close error.");
return -1;
}
SDL_FreeRW(rw);
return 0;
}
#ifdef USE_SDL2
RWOPSINT rwops_size(SDL_RWops *const rw)
{
VirtFile *const handle = static_cast<VirtFile *const>(
rw->hidden.unknown.data1);
return VirtFs::fileLength(handle);
}
#endif // USE_SDL2
} // namespace VirtFsDir
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