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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* tar.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#ifndef TAR_H
#define TAR_H
#include "config.h"
#include "compat.h"
#include "io/istream.h"
#include "io/ostream.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
typedef struct sparse_map_t {
struct sparse_map_t *next;
sqfs_u64 offset;
sqfs_u64 count;
} sparse_map_t;
typedef struct tar_xattr_t {
struct tar_xattr_t *next;
char *key;
sqfs_u8 *value;
size_t value_len;
char data[];
} tar_xattr_t;
typedef struct {
char *name;
char *link_target;
sparse_map_t *sparse;
sqfs_u64 actual_size;
sqfs_u64 record_size;
bool unknown_record;
bool is_hard_link;
tar_xattr_t *xattr;
sqfs_u16 mode;
sqfs_u64 uid;
sqfs_u64 gid;
sqfs_u64 devno;
sqfs_s64 mtime;
} tar_header_decoded_t;
#ifdef __cplusplus
extern "C" {
#endif
/*
Returns < 0 on failure, > 0 if cannot encode, 0 on success.
Prints error/warning messages to stderr.
The counter is an incremental record counter used if additional
headers need to be generated.
*/
int write_tar_header(ostream_t *fp, const struct stat *sb, const char *name,
const char *slink_target, const tar_xattr_t *xattr,
unsigned int counter);
int write_hard_link(ostream_t *fp, const struct stat *sb, const char *name,
const char *target, unsigned int counter);
/* round up to block size and skip the entire entry */
int skip_entry(istream_t *fp, sqfs_u64 size);
int read_header(istream_t *fp, tar_header_decoded_t *out);
void clear_header(tar_header_decoded_t *hdr);
istream_t *tar_record_istream_create(istream_t *parent,
const tar_header_decoded_t *hdr);
/*
Write zero bytes to an output file to padd it to the tar record size.
Returns 0 on success. On failure, prints error message to stderr.
*/
int padd_file(ostream_t *fp, sqfs_u64 size);
void free_sparse_list(sparse_map_t *sparse);
void free_xattr_list(tar_xattr_t *list);
#ifdef __cplusplus
}
#endif
#endif /* TAR_H */
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