/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * data_reader.h
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#ifndef DATA_READER_H
#define DATA_READER_H

#include "config.h"

#include "sqfs/compress.h"
#include "sqfs/data.h"
#include "fstree.h"

typedef struct sqfs_data_reader_t sqfs_data_reader_t;


sqfs_data_reader_t *sqfs_data_reader_create(sqfs_file_t *file,
					    size_t block_size,
					    sqfs_compressor_t *cmp);

int sqfs_data_reader_load_fragment_table(sqfs_data_reader_t *data,
					 const sqfs_super_t *super);

void sqfs_data_reader_destroy(sqfs_data_reader_t *data);

int sqfs_data_reader_get_fragment(sqfs_data_reader_t *data,
				  const sqfs_inode_generic_t *inode,
				  sqfs_block_t **out);

int sqfs_data_reader_get_block(sqfs_data_reader_t *data,
			       const sqfs_inode_generic_t *inode,
			       size_t index, sqfs_block_t **out);

int sqfs_data_reader_dump(sqfs_data_reader_t *data,
			  const sqfs_inode_generic_t *inode,
			  int outfd, size_t block_size, bool allow_sparse);

/*
  Read a chunk of data from a file. Starting from 'offset' into the
  uncompressed file, read 'size' bytes into 'buffer'.

  Returns the number of bytes read, 0 if EOF, -1 on failure. Prints an
  error message to stderr on failure.
 */
ssize_t sqfs_data_reader_read(sqfs_data_reader_t *data,
			      const sqfs_inode_generic_t *inode,
			      uint64_t offset, void *buffer, size_t size);

#endif /* DATA_READER_H */