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/**
* @file filesystem.h
* @brief Simulate local file system operations.
* @Note The initial implementation does actually use standard C++
* file operations but eventually, there will be another
* layer that caches and manages file meta data too.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_FILESYSTEM_H
#define LL_FILESYSTEM_H
#include "lluuid.h"
#include "llassettype.h"
#include "lldiskcache.h"
class LLFileSystem
{
public:
LLFileSystem(const LLUUID& file_id, const LLAssetType::EType file_type, S32 mode = LLFileSystem::READ);
~LLFileSystem() = default;
bool read(U8* buffer, S32 bytes);
S32 getLastBytesRead() const;
bool eof() const;
bool write(const U8* buffer, S32 bytes);
bool seek(S32 offset, S32 origin = -1);
S32 tell() const;
S32 getSize() const;
S32 getMaxSize() const;
bool rename(const LLUUID& new_id, const LLAssetType::EType new_type);
bool remove() const;
/**
* Update the "last write time" of a file to "now". This must be called whenever a
* file in the cache is read (not written) so that the last time the file was
* accessed is up to date (This is used in the mechanism for purging the cache)
*/
void updateFileAccessTime(const std::string& file_path);
static bool getExists(const LLUUID& file_id, const LLAssetType::EType file_type);
static bool removeFile(const LLUUID& file_id, const LLAssetType::EType file_type, int suppress_error = 0);
static bool renameFile(const LLUUID& old_file_id, const LLAssetType::EType old_file_type,
const LLUUID& new_file_id, const LLAssetType::EType new_file_type);
static S32 getFileSize(const LLUUID& file_id, const LLAssetType::EType file_type);
public:
static const S32 READ;
static const S32 WRITE;
static const S32 READ_WRITE;
static const S32 APPEND;
protected:
LLAssetType::EType mFileType;
LLUUID mFileID;
S32 mPosition;
S32 mMode;
S32 mBytesRead;
};
#endif // LL_FILESYSTEM_H
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