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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 7 мар. 2019 г.
*
* lsp-runtime-lib 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, either version 3 of the License, or
* any later version.
*
* lsp-runtime-lib 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 lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_IO_NATIVEFILE_H_
#define LSP_PLUG_IN_IO_NATIVEFILE_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/runtime/LSPString.h>
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/io/Path.h>
#include <lsp-plug.in/io/File.h>
namespace lsp
{
namespace io
{
/**
* This class provides file interface that uses low-level file functions
* at the backend for file operations. Also this class allows to
* wrap native file descriptor into an object instance.
*/
class NativeFile: public File
{
private:
enum flags_t
{
SF_READ = 1 << 0,
SF_WRITE = 1 << 1,
SF_CLOSE = 1 << 2
};
protected:
fhandle_t hFD;
size_t nFlags;
private:
NativeFile &operator = (const NativeFile &fd); // Deny copying
public:
explicit NativeFile();
virtual ~NativeFile();
public:
/**
* Open file
* @param path file location
* @param mode open mode
* @return status of operation
*/
status_t open(const char *path, size_t mode);
/**
* Open file
* @param path file location
* @param mode open mode
* @return status of operation
*/
status_t open(const LSPString *path, size_t mode);
/**
* Open file
* @param path file location
* @param mode open mode
* @return status of operation
*/
status_t open(const Path *path, size_t mode);
/**
* Wrap the standard file descriptor and allow both read
* and write operations
* @param fd file descriptor to wrap
* @param close close the file descriptor on close() call
* @return status of operation
*/
status_t wrap(fhandle_t fd, bool close);
/**
* Wrap the standard file descriptor
* @param fd file descriptor to wrap
* @param mode allowed access modes (read, write or both)
* @param close close the file descriptor on close() call
* @return status of operation
*/
status_t wrap(fhandle_t fd, size_t mode, bool close);
/**
* Read binary file
* @param dst target buffer to perform read
* @param count amount of bytes to read
* @return number of bytes read or negative status of operation,
* on end of file -STATUS_EOF is returned
*/
virtual ssize_t read(void *dst, size_t count);
/**
* Perform positioned read of binary file
* @param pos offset in bytes relative to the beginning of the file
* @param dst target buffer to perform read
* @param count amount of bytes to read
* @return number of bytes read or status of operation
*/
virtual ssize_t pread(wsize_t pos, void *dst, size_t count);
/**
* Write binary file
* @param dst source buffer to perform write
* @param count number of bytes to write
* @return number of bytes written or negative status of operation
*/
virtual ssize_t write(const void *src, size_t count);
/**
* Perform positioned write of binary file
* @param pos offset in bytes relative to the beginning of the file
* @param dst source buffer to perform write
* @param count number of bytes to write
* @return status of operation
*/
virtual ssize_t pwrite(wsize_t pos, const void *src, size_t count);
/**
* Perform seek to the specified position
* @param pos position to perform seek
* @param type seek type
* @return status of operation
*/
virtual status_t seek(wssize_t pos, size_t type = FSK_SET);
/**
* Obtain current file's position
* @return current file's position or negative error code
*/
virtual wssize_t position();
/**
* Obtain current file's size
* @return current file's size or negative error code
*/
virtual wssize_t size();
/**
* Get file attributes
* @param attr file attributes
* @return
*/
virtual status_t stat(fattr_t *attr);
/**
* Truncate the file
* @param length the final file length
* @return status of operation
*/
virtual status_t truncate(wsize_t length);
/**
* Flush file buffer to underlying storage
* @return status of operation
*/
virtual status_t flush();
/**
* Sync file with the underlying storage
* @return status of operation
*/
virtual status_t sync();
/**
* Close file
* @return status of operation
*/
virtual status_t close();
};
} /* namespace io */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_IO_NATIVEFILE_H_ */
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