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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/fsziprwops.h"
#include "logger.h"
#include "fs/virtfs/file.h"
#include "fs/virtfs/fsfuncs.h"
#include <SDL_rwops.h>
#include "debug.h"
namespace VirtFs
{
namespace FsZip
{
RWOPSINT rwops_seek(SDL_RWops *const rw,
const RWOPSINT offset,
const int whence)
{
if (!rw)
return -1;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
size_t mPos = handle->mPos;
size_t mSize = handle->mSize;
RWOPSINT pos = 0;
if (whence == SEEK_SET)
{
pos = offset;
}
else if (whence == SEEK_CUR)
{
const int64_t current = mPos;
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)
{
pos = static_cast<RWOPSINT>(mSize + 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;
}
handle->mPos = pos;
if (pos > static_cast<RWOPSINT>(mSize))
{
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;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
const int64_t rc = handle->funcs->read(handle,
ptr,
CAST_U32(size),
CAST_U32(maxnum));
return CAST_S32(rc);
}
RWOPSSIZE rwops_write(SDL_RWops *const rw A_UNUSED,
const void *const ptr A_UNUSED,
const RWOPSSIZE size A_UNUSED,
const RWOPSSIZE num A_UNUSED)
{
return 0;
}
int rwops_close(SDL_RWops *const rw)
{
if (!rw)
return 0;
File *const handle = static_cast<File*>(
rw->hidden.unknown.data1);
delete handle;
SDL_FreeRW(rw);
return 0;
}
#ifdef USE_SDL2
RWOPSINT rwops_size(SDL_RWops *const rw)
{
if (!rw)
return 0;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
return handle->mSize;
}
#endif // USE_SDL2
} // namespace FsZip
} // namespace VirtFs
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