From 2f172ede7115d0a2730a3b689131042ba559e272 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Wed, 19 Jun 2019 15:04:17 +0200 Subject: Split generic tar code off to static library Signed-off-by: David Oberhollenzer --- include/tar.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 include/tar.h (limited to 'include/tar.h') diff --git a/include/tar.h b/include/tar.h new file mode 100644 index 0000000..7862235 --- /dev/null +++ b/include/tar.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +#ifndef TAR_H +#define TAR_H + +#include +#include + +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]; + char prefix[155]; + char padding[12]; +} tar_header_t; + +typedef struct { + struct stat sb; + char *name; + char *link_target; + 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_PAX 'x' + +#define TAR_MAGIC "ustar" +#define TAR_VERSION "00" + +/* + 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 */ -- cgit v1.2.3