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/* SPDX-License-Identifier: GPL-3.0-or-later */
#ifndef TAR_H
#define TAR_H
#include <sys/stat.h>
#include <stdbool.h>
#include <stdint.h>
typedef enum {
ETV_UNKNOWN = 0,
ETV_V7_UNIX,
ETV_PRE_POSIX,
ETV_POSIX,
} E_TAR_VERSION;
typedef struct {
char name[100];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char typeflag;
char linkname[100];
char magic[6];
char version[2];
char uname[32];
char gname[32];
char devmajor[8];
char devminor[8];
union {
struct {
char prefix[155];
char padding[12];
} posix;
struct {
char atime[12];
char ctime[12];
char offset[12];
char deprecated[4];
char unused;
struct {
char offset[12];
char numbytes[12];
} sparse[4];
char isextended;
char realsize[12];
char padding[17];
} gnu;
} tail;
} tar_header_t;
typedef struct {
struct {
char offset[12];
char numbytes[12];
} sparse[21];
char isextended;
char padding[7];
} gnu_sparse_t;
typedef struct tar_sparse_data_t {
struct tar_sparse_data_t *next;
uint64_t offset;
uint64_t count;
} tar_sparse_data_t;
typedef struct {
struct stat sb;
char *name;
char *link_target;
tar_sparse_data_t *sparse;
uint64_t sparse_size;
bool unknown_record;
} tar_header_decoded_t;
#define TAR_TYPE_FILE '0'
#define TAR_TYPE_LINK '1'
#define TAR_TYPE_SLINK '2'
#define TAR_TYPE_CHARDEV '3'
#define TAR_TYPE_BLOCKDEV '4'
#define TAR_TYPE_DIR '5'
#define TAR_TYPE_FIFO '6'
#define TAR_TYPE_GNU_SLINK 'K'
#define TAR_TYPE_GNU_PATH 'L'
#define TAR_TYPE_GNU_SPARSE 'S'
#define TAR_TYPE_PAX 'x'
#define TAR_MAGIC "ustar"
#define TAR_VERSION "00"
#define TAR_MAGIC_OLD "ustar "
#define TAR_VERSION_OLD " "
/*
Returns < 0 on failure, > 0 if cannot encode, 0 on success.
Prints error/warning messages to stderr.
*/
int write_tar_header(int fd, const struct stat *sb, const char *name,
const char *slink_target);
/* calcuate and skip the zero padding */
int skip_padding(int fd, uint64_t size);
/* round up to block size and skip the entire entry */
int skip_entry(int fd, uint64_t size);
int read_header(int fd, tar_header_decoded_t *out);
void clear_header(tar_header_decoded_t *hdr);
#endif /* TAR_H */
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