1/* vi: set sw=4 ts=4: */ 2#ifndef UNARCHIVE_H 3#define UNARCHIVE_H 1 4 5PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN 6 7enum { 8#if BB_BIG_ENDIAN 9 COMPRESS_MAGIC = 0x1f9d, 10 GZIP_MAGIC = 0x1f8b, 11 BZIP2_MAGIC = 'B' * 256 + 'Z', 12 /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */ 13 /* More info at: http://tukaani.org/xz/xz-file-format.txt */ 14 XZ_MAGIC1 = 0xfd * 256 + '7', 15 XZ_MAGIC2 = (('z' * 256 + 'X') * 256 + 'Z') * 256 + 0, 16 /* Different form: 32 bits, then 16 bits: */ 17 XZ_MAGIC1a = ((0xfd * 256 + '7') * 256 + 'z') * 256 + 'X', 18 XZ_MAGIC2a = 'Z' * 256 + 0, 19#else 20 COMPRESS_MAGIC = 0x9d1f, 21 GZIP_MAGIC = 0x8b1f, 22 BZIP2_MAGIC = 'Z' * 256 + 'B', 23 XZ_MAGIC1 = '7' * 256 + 0xfd, 24 XZ_MAGIC2 = ((0 * 256 + 'Z') * 256 + 'X') * 256 + 'z', 25 XZ_MAGIC1a = (('X' * 256 + 'z') * 256 + '7') * 256 + 0xfd, 26 XZ_MAGIC2a = 0 * 256 + 'Z', 27#endif 28}; 29 30typedef struct file_header_t { 31 char *name; 32 char *link_target; 33#if ENABLE_FEATURE_TAR_UNAME_GNAME 34 char *tar__uname; 35 char *tar__gname; 36#endif 37 off_t size; 38 uid_t uid; 39 gid_t gid; 40 mode_t mode; 41 time_t mtime; 42 dev_t device; 43} file_header_t; 44 45struct hardlinks_t; 46 47typedef struct archive_handle_t { 48 /* Flags. 1st since it is most used member */ 49 unsigned ah_flags; 50 51 /* The raw stream as read from disk or stdin */ 52 int src_fd; 53 54 /* Define if the header and data component should be processed */ 55 char FAST_FUNC (*filter)(struct archive_handle_t *); 56 /* List of files that have been accepted */ 57 llist_t *accept; 58 /* List of files that have been rejected */ 59 llist_t *reject; 60 /* List of files that have successfully been worked on */ 61 llist_t *passed; 62 63 /* Currently processed file's header */ 64 file_header_t *file_header; 65 66 /* Process the header component, e.g. tar -t */ 67 void FAST_FUNC (*action_header)(const file_header_t *); 68 69 /* Process the data component, e.g. extract to filesystem */ 70 void FAST_FUNC (*action_data)(struct archive_handle_t *); 71 72 /* Function that skips data */ 73 void FAST_FUNC (*seek)(int fd, off_t amount); 74 75 /* Count processed bytes */ 76 off_t offset; 77 78 /* Archiver specific. Can make it a union if it ever gets big */ 79#if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB 80 smallint tar__end; 81# if ENABLE_FEATURE_TAR_GNU_EXTENSIONS 82 char* tar__longname; 83 char* tar__linkname; 84# endif 85#if ENABLE_FEATURE_TAR_TO_COMMAND 86 char* tar__to_command; 87#endif 88# if ENABLE_FEATURE_TAR_SELINUX 89 char* tar__global_sctx; 90 char* tar__next_file_sctx; 91# endif 92#endif 93#if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM 94 uoff_t cpio__blocks; 95 struct hardlinks_t *cpio__hardlinks_to_create; 96 struct hardlinks_t *cpio__created_hardlinks; 97#endif 98#if ENABLE_DPKG || ENABLE_DPKG_DEB 99 /* Temporary storage */ 100 char *dpkg__buffer; 101 /* How to process any sub archive, e.g. get_header_tar_gz */ 102 char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *); 103 /* Contains the handle to a sub archive */ 104 struct archive_handle_t *dpkg__sub_archive; 105#endif 106#if ENABLE_FEATURE_AR_CREATE 107 const char *ar__name; 108 struct archive_handle_t *ar__out; 109#endif 110} archive_handle_t; 111/* bits in ah_flags */ 112#define ARCHIVE_RESTORE_DATE (1 << 0) 113#define ARCHIVE_CREATE_LEADING_DIRS (1 << 1) 114#define ARCHIVE_UNLINK_OLD (1 << 2) 115#define ARCHIVE_EXTRACT_QUIET (1 << 3) 116#define ARCHIVE_EXTRACT_NEWER (1 << 4) 117#define ARCHIVE_DONT_RESTORE_OWNER (1 << 5) 118#define ARCHIVE_DONT_RESTORE_PERM (1 << 6) 119#define ARCHIVE_NUMERIC_OWNER (1 << 7) 120#define ARCHIVE_O_TRUNC (1 << 8) 121 122 123/* POSIX tar Header Block, from POSIX 1003.1-1990 */ 124#define TAR_BLOCK_SIZE 512 125#define NAME_SIZE 100 126#define NAME_SIZE_STR "100" 127typedef struct tar_header_t { /* byte offset */ 128 char name[NAME_SIZE]; /* 0-99 */ 129 char mode[8]; /* 100-107 */ 130 char uid[8]; /* 108-115 */ 131 char gid[8]; /* 116-123 */ 132 char size[12]; /* 124-135 */ 133 char mtime[12]; /* 136-147 */ 134 char chksum[8]; /* 148-155 */ 135 char typeflag; /* 156-156 */ 136 char linkname[NAME_SIZE]; /* 157-256 */ 137 /* POSIX: "ustar" NUL "00" */ 138 /* GNU tar: "ustar " NUL */ 139 /* Normally it's defined as magic[6] followed by 140 * version[2], but we put them together to save code. 141 */ 142 char magic[8]; /* 257-264 */ 143 char uname[32]; /* 265-296 */ 144 char gname[32]; /* 297-328 */ 145 char devmajor[8]; /* 329-336 */ 146 char devminor[8]; /* 337-344 */ 147 char prefix[155]; /* 345-499 */ 148 char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */ 149} tar_header_t; 150struct BUG_tar_header { 151 char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1]; 152}; 153 154 155 156/* Info struct unpackers can fill out to inform users of thing like 157 * timestamps of unpacked files */ 158typedef struct unpack_info_t { 159 time_t mtime; 160} unpack_info_t; 161 162extern archive_handle_t *init_handle(void) FAST_FUNC; 163 164extern char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC; 165extern char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC; 166extern char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC; 167extern char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC; 168 169extern void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC; 170 171extern void data_skip(archive_handle_t *archive_handle) FAST_FUNC; 172extern void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC; 173extern void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC; 174extern void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC; 175 176extern void header_skip(const file_header_t *file_header) FAST_FUNC; 177extern void header_list(const file_header_t *file_header) FAST_FUNC; 178extern void header_verbose_list(const file_header_t *file_header) FAST_FUNC; 179 180extern char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC; 181extern char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC; 182extern char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC; 183extern char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC; 184extern char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC; 185extern char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC; 186 187extern void seek_by_jump(int fd, off_t amount) FAST_FUNC; 188extern void seek_by_read(int fd, off_t amount) FAST_FUNC; 189 190extern void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC; 191extern const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC; 192extern const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC; 193 194/* A bit of bunzip2 internals are exposed for compressed help support: */ 195typedef struct bunzip_data bunzip_data; 196int start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *inbuf, int len) FAST_FUNC; 197int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC; 198void dealloc_bunzip(bunzip_data *bd) FAST_FUNC; 199 200typedef struct inflate_unzip_result { 201 off_t bytes_out; 202 uint32_t crc; 203} inflate_unzip_result; 204 205IF_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, off_t compr_size, int src_fd, int dst_fd) FAST_FUNC; 206/* xz unpacker takes .xz stream from offset 6 */ 207IF_DESKTOP(long long) int unpack_xz_stream(int src_fd, int dst_fd) FAST_FUNC; 208/* lzma unpacker takes .lzma stream from offset 0 */ 209IF_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd) FAST_FUNC; 210/* the rest wants 2 first bytes already skipped by the caller */ 211IF_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC; 212IF_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC; 213IF_DESKTOP(long long) int unpack_gz_stream_with_info(int src_fd, int dst_fd, unpack_info_t *info) FAST_FUNC; 214IF_DESKTOP(long long) int unpack_Z_stream(int src_fd, int dst_fd) FAST_FUNC; 215/* wrapper which checks first two bytes to be "BZ" */ 216IF_DESKTOP(long long) int unpack_bz2_stream_prime(int src_fd, int dst_fd) FAST_FUNC; 217 218char* append_ext(char *filename, const char *expected_ext) FAST_FUNC; 219int bbunpack(char **argv, 220 IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info), 221 char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext), 222 const char *expected_ext 223) FAST_FUNC; 224 225#if BB_MMU 226void open_transformer(int fd, 227 IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd)) FAST_FUNC; 228#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transformer) 229#else 230void open_transformer(int src_fd, const char *transform_prog) FAST_FUNC; 231#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transform_prog) 232#endif 233 234POP_SAVED_FUNCTION_VISIBILITY 235 236#endif 237