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/* SPDX-License-Identifier: GPL-3.0-or-later */
#ifndef DATA_READER_H
#define DATA_READER_H
#include "config.h"
#include "frag_reader.h"
#include "squashfs.h"
#include "compress.h"
#include "fstree.h"
typedef struct data_reader_t data_reader_t;
/*
Create a data reader for accessing data blocks in a squashfs image.
Internally creates a fragment_reader_t (if applicable) to resolve
fragment indices.
Prints error messsages to stderr on failure.
*/
data_reader_t *data_reader_create(int fd, sqfs_super_t *super,
compressor_t *cmp);
void data_reader_destroy(data_reader_t *data);
/*
Use a file_info_t to locate and extract all blocks of the coresponding
file and its fragment, if it has one. The entire data is dumped to the
given file descriptor.
If allow_sparse is true, try to truncate and seek forward on outfd if a
zero block is found. If false, always write blocks of zeros to outfd.
Returns 0 on success, prints error messages to stderr on failure.
*/
int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd,
bool allow_sparse);
const frag_reader_t *data_reader_get_fragment_reader(const data_reader_t *data);
#endif /* DATA_READER_H */
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