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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* meta_writer.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef META_WRITER_H
#define META_WRITER_H
#include "config.h"
#include "sqfs/compress.h"
#include "sqfs/id_table.h"
#include "sqfs/data.h"
typedef struct meta_writer_t meta_writer_t;
#ifdef __cplusplus
extern "C" {
#endif
/* Create a meta data reader using a given compressor to compress data.
Internally prints error message to stderr on failure.
If keep_in_mem is true, the blocks are collected in memory and must
be explicitly flushed to disk using meta_write_write_to_file.
*/
meta_writer_t *meta_writer_create(int fd, compressor_t *cmp, bool keep_in_mem);
void meta_writer_destroy(meta_writer_t *m);
/* Compress and flush the currently unfinished block to disk. Returns 0 on
success, internally prints error message to stderr on failure */
int meta_writer_flush(meta_writer_t *m);
/* Returns 0 on success. Prints error message to stderr on failure. */
int meta_writer_append(meta_writer_t *m, const void *data, size_t size);
/* Query the current block start position and offset within the block */
void meta_writer_get_position(const meta_writer_t *m, uint64_t *block_start,
uint32_t *offset);
/* Reset all internal state, including the current block start position. */
void meta_writer_reset(meta_writer_t *m);
/* If created with keep_in_mem true, write the collected blocks to disk.
Does not flush the current block. Writes error messages to stderr and
returns non-zero on failure. */
int meta_write_write_to_file(meta_writer_t *m);
#ifdef __cplusplus
}
#endif
#endif /* META_WRITER_H */
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