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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* meta_reader.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef META_READER_H
#define META_READER_H
#include "config.h"
#include "sqfs/compress.h"
#include "sqfs/data.h"
typedef struct meta_reader_t meta_reader_t;
#ifdef __cplusplus
extern "C" {
#endif
/* Create a meta data reader using a given compressor to extract data.
Internally prints error message to stderr on failure.
Start offset and limit can be specified to do bounds checking against
a subregion of the filesystem image.
*/
meta_reader_t *meta_reader_create(int fd, compressor_t *cmp,
uint64_t start, uint64_t limit);
void meta_reader_destroy(meta_reader_t *m);
/* Returns 0 on success. Internally prints to stderr on failure */
int meta_reader_seek(meta_reader_t *m, uint64_t block_start,
size_t offset);
void meta_reader_get_position(meta_reader_t *m, uint64_t *block_start,
size_t *offset);
/* Returns 0 on success. Internally prints to stderr on failure */
int meta_reader_read(meta_reader_t *m, void *data, size_t size);
#ifdef __cplusplus
}
#endif
#endif /* META_READER_H */
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