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/*
* The ManaVerse Client
* Copyright (C) 2013-2019 The ManaPlus Developers
*
* This file is part of The ManaVerse 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/fsdirrwops.h"
#include "fs/virtfs/file.h"
#include "utils/cast.h"
#include "utils/checkutils.h"
PRAGMA48(GCC diagnostic push)
PRAGMA48(GCC diagnostic ignored "-Wshadow")
#include <SDL_rwops.h>
PRAGMA48(GCC diagnostic pop)
#include "debug.h"
namespace VirtFs
{
namespace FsDir
{
RWOPSINT rwops_seek(SDL_RWops *const rw,
const RWOPSINT offset,
const int whence)
{
if (rw == nullptr)
return -1;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
FILEHTYPE fd = handle->mFd;
RWOPSINT pos = 0;
if (whence == SEEK_SET)
{
pos = offset;
}
else if (whence == SEEK_CUR)
{
#ifdef USE_FILE_FOPEN
const int64_t current = ftell(fd);
#else // USE_FILE_FOPEN
const int64_t current = lseek(fd, 0, SEEK_CUR);
#endif // USE_FILE_FOPEN
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)
{
int64_t len = 0;
#ifdef USE_FILE_FOPEN
const long curpos = ftell(fd);
if (curpos < 0)
{
reportAlways("FsDir::fileLength ftell error.")
return -1;
}
fseek(fd, 0, SEEK_END);
len = ftell(fd);
// fseek(fd, curpos, SEEK_SET);
#else // USE_FILE_FOPEN
struct stat statbuf;
if (fstat(fd, &statbuf) == -1)
{
reportAlways("FsDir::fileLength error.")
len = -1;
}
else
{
len = static_cast<int64_t>(statbuf.st_size);
}
#endif // USE_FILE_FOPEN
if (len == -1)
{
#ifdef USE_FILE_FOPEN
if (fseek(fd, curpos, SEEK_SET) < 0)
{
reportAlways("FsDir::fileLength fseek error.")
}
#endif // USE_FILE_FOPEN
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)
{
#ifdef USE_FILE_FOPEN
fseek(fd, curpos, SEEK_SET);
#endif // USE_FILE_FOPEN
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;
}
const int64_t res = FILESEEK(fd, pos, SEEK_SET);
if (res == -1)
{
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 == nullptr)
return 0;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
FILEHTYPE fd = handle->mFd;
#ifdef USE_FILE_FOPEN
const int64_t rc = fread(ptr, size, maxnum, fd);
#else // USE_FILE_FOPEN
int max = size * maxnum;
int cnt = ::read(fd, ptr, max);
if (cnt <= 0)
return cnt;
const int64_t rc = cnt / size;
#endif // USE_FILE_FOPEN
#ifndef USE_FILE_FOPEN
if (rc != static_cast<int64_t>(maxnum))
{
const int64_t pos = lseek(fd, 0, SEEK_CUR);
struct stat statbuf;
if (fstat(fd, &statbuf) == -1)
{
reportAlways("FsDir::fileLength error.")
return CAST_S32(rc);
}
}
#endif // USE_FILE_FOPEN
return CAST_S32(rc);
}
RWOPSSIZE rwops_write(SDL_RWops *const rw,
const void *const ptr,
const RWOPSSIZE size,
const RWOPSSIZE maxnum)
{
if (rw == nullptr)
return 0;
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
FILEHTYPE fd = handle->mFd;
#ifdef USE_FILE_FOPEN
const int64_t rc = fwrite(ptr, size, maxnum, fd);
#else // USE_FILE_FOPEN
int max = size * maxnum;
int cnt = ::write(fd, ptr, max);
if (cnt <= 0)
return cnt;
const int64_t rc = cnt / size;
#endif // USE_FILE_FOPEN
#ifndef USE_FILE_FOPEN
if (rc != static_cast<int64_t>(maxnum))
{
const int64_t pos = lseek(fd, 0, SEEK_CUR);
struct stat statbuf;
if (fstat(fd, &statbuf) == -1)
{
reportAlways("FsDir::fileLength error.")
return CAST_S32(rc);
}
}
#endif // USE_FILE_FOPEN
return CAST_S32(rc);
}
int rwops_close(SDL_RWops *const rw)
{
if (rw == nullptr)
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)
{
File *const handle = static_cast<File *>(
rw->hidden.unknown.data1);
FILEHTYPE fd = handle->mFd;
#ifdef USE_FILE_FOPEN
const long pos = ftell(fd);
fseek(fd, 0, SEEK_END);
const long sz = ftell(fd);
fseek(fd, pos, SEEK_SET);
return sz;
#else // USE_FILE_FOPEN
struct stat statbuf;
if (fstat(fd, &statbuf) == -1)
{
reportAlways("FsDir::fileLength error.")
return -1;
}
return static_cast<int64_t>(statbuf.st_size);
#endif // USE_FILE_FOPEN
}
#endif // USE_SDL2
} // namespace FsDir
} // namespace VirtFs
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