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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* file.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef IO_FILE_H
#define IO_FILE_H
#include "io/istream.h"
#include "io/ostream.h"
#if defined(_WIN32) || defined(__WINDOWS__)
#include <handleapi.h>
typedef HANDLE os_file_t;
#else
typedef int os_file_t;
#endif
enum {
OSTREAM_OPEN_OVERWRITE = 0x01,
OSTREAM_OPEN_NO_SPARSE = 0x02,
};
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Create an input stream for an OS native file handle.
*
* @memberof istream_t
*
* The functions takes up ownership of the file handle and takes care
* of cleaning it up. On failure, the handle remains usable, and ownership
* remains with the caller.
*
* @param path The name to associate with the handle.
* @param fd A native file handle.
*
* @return A pointer to an output stream on success, NULL on failure.
*/
SQFS_INTERNAL istream_t *istream_open_handle(const char *path, os_file_t fd);
/**
* @brief Create an output stream that writes to an OS native file handle.
*
* @memberof ostream_t
*
* If the flag OSTREAM_OPEN_NO_SPARSE is set, the underlying implementation
* always writes chunks of zero bytes when passing a NULL pointer to append.
* Otherwise, it tries to use seek/truncate style APIs to create sparse output
* files.
*
* @param path The name to associate with the handle.
* @param fd A native file handle.
* @param flags A combination of flags.
*
* @return A pointer to an output stream on success, NULL on failure.
*/
SQFS_INTERNAL ostream_t *ostream_open_handle(const char *path, os_file_t hnd,
int flags);
/**
* @brief Create an input stream that reads from a file.
*
* @memberof istream_t
*
* @param path A path to the file to open or create.
*
* @return A pointer to an output stream on success, NULL on failure.
*/
SQFS_INTERNAL istream_t *istream_open_file(const char *path);
/**
* @brief Create an output stream that writes to a file.
*
* @memberof ostream_t
*
* If the file does not yet exist, it is created. If it does exist this
* function fails, unless the flag OSTREAM_OPEN_OVERWRITE is set, in which
* case the file is opened and its contents are discarded.
*
* If the flag OSTREAM_OPEN_NO_SPARSE is set, the underlying implementation
* always writes chunks of zero bytes when passing a NULL pointer to append.
* Otherwise, it tries to use seek/truncate style APIs to create sparse output
* files.
*
* @param path A path to the file to open or create.
* @param flags A combination of flags controling how to open/create the file.
*
* @return A pointer to an output stream on success, NULL on failure.
*/
SQFS_INTERNAL ostream_t *ostream_open_file(const char *path, int flags);
#ifdef __cplusplus
}
#endif
#endif /* IO_FILE_H */
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