1 /* vi: set sw=4 ts=4: */
5 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
9 COMPRESS_MAGIC = 0x1f9d,
11 BZIP2_MAGIC = 256 * 'B' + '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 = 256 * 0xfd + '7',
15 XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
16 /* Different form: 32 bits, then 16 bits: */
17 /* (unsigned) cast suppresses "integer overflow in expression" warning */
18 XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
19 XZ_MAGIC2a = 256 * 'Z' + 0,
21 COMPRESS_MAGIC = 0x9d1f,
23 BZIP2_MAGIC = 'B' + 'Z' * 256,
24 XZ_MAGIC1 = 0xfd + '7' * 256,
25 XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
26 XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
27 XZ_MAGIC2a = 'Z' + 0 * 256,
31 typedef struct file_header_t {
34 #if ENABLE_FEATURE_TAR_UNAME_GNAME
48 typedef struct archive_handle_t {
49 /* Flags. 1st since it is most used member */
52 /* The raw stream as read from disk or stdin */
55 /* Define if the header and data component should be processed */
56 char FAST_FUNC (*filter)(struct archive_handle_t *);
57 /* List of files that have been accepted */
59 /* List of files that have been rejected */
61 /* List of files that have successfully been worked on */
64 /* Currently processed file's header */
65 file_header_t *file_header;
67 /* List of symlink placeholders */
68 llist_t *symlink_placeholders;
70 /* Process the header component, e.g. tar -t */
71 void FAST_FUNC (*action_header)(const file_header_t *);
73 /* Process the data component, e.g. extract to filesystem */
74 void FAST_FUNC (*action_data)(struct archive_handle_t *);
76 /* Function that skips data */
77 void FAST_FUNC (*seek)(int fd, off_t amount);
79 /* Count processed bytes */
82 /* Archiver specific. Can make it a union if it ever gets big */
83 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
84 unsigned tar__strip_components;
86 #define PAX_NEXT_FILE 0
88 #if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB
90 # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
94 # if ENABLE_FEATURE_TAR_TO_COMMAND
95 char* tar__to_command;
96 const char* tar__to_command_shell;
98 # if ENABLE_FEATURE_TAR_SELINUX
102 #if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
104 struct bb_uidgid_t cpio__owner;
105 struct hardlinks_t *cpio__hardlinks_to_create;
106 struct hardlinks_t *cpio__created_hardlinks;
108 #if ENABLE_DPKG || ENABLE_DPKG_DEB
109 /* Temporary storage */
111 /* How to process any sub archive, e.g. get_header_tar_gz */
112 char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *);
113 /* Contains the handle to a sub archive */
114 struct archive_handle_t *dpkg__sub_archive;
116 #if ENABLE_FEATURE_AR_CREATE
117 const char *ar__name;
118 struct archive_handle_t *ar__out;
121 /* bits in ah_flags */
122 #define ARCHIVE_RESTORE_DATE (1 << 0)
123 #define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
124 #define ARCHIVE_UNLINK_OLD (1 << 2)
125 #define ARCHIVE_EXTRACT_NEWER (1 << 3)
126 #define ARCHIVE_DONT_RESTORE_OWNER (1 << 4)
127 #define ARCHIVE_DONT_RESTORE_PERM (1 << 5)
128 #define ARCHIVE_NUMERIC_OWNER (1 << 6)
129 #define ARCHIVE_O_TRUNC (1 << 7)
130 #define ARCHIVE_REMEMBER_NAMES (1 << 8)
132 #define ARCHIVE_REPLACE_VIA_RENAME (1 << 9)
136 /* POSIX tar Header Block, from POSIX 1003.1-1990 */
137 #define TAR_BLOCK_SIZE 512
138 #define NAME_SIZE 100
139 #define NAME_SIZE_STR "100"
140 typedef struct tar_header_t { /* byte offset */
141 char name[NAME_SIZE]; /* 0-99 */
142 char mode[8]; /* 100-107 */
143 char uid[8]; /* 108-115 */
144 char gid[8]; /* 116-123 */
145 char size[12]; /* 124-135 */
146 char mtime[12]; /* 136-147 */
147 char chksum[8]; /* 148-155 */
148 char typeflag; /* 156-156 */
149 char linkname[NAME_SIZE]; /* 157-256 */
150 /* POSIX: "ustar" NUL "00" */
151 /* GNU tar: "ustar " NUL */
152 /* Normally it's defined as magic[6] followed by
153 * version[2], but we put them together to save code.
155 char magic[8]; /* 257-264 */
156 char uname[32]; /* 265-296 */
157 char gname[32]; /* 297-328 */
158 char devmajor[8]; /* 329-336 */
159 char devminor[8]; /* 337-344 */
160 char prefix[155]; /* 345-499 */
161 char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
163 struct BUG_tar_header {
164 char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
168 extern const char cpio_TRAILER[];
171 archive_handle_t *init_handle(void) FAST_FUNC;
173 char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
174 char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
175 char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
176 char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
178 void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
180 void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
181 void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
182 void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
183 void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC;
185 void header_skip(const file_header_t *file_header) FAST_FUNC;
186 void header_list(const file_header_t *file_header) FAST_FUNC;
187 void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
189 char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
190 char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
191 char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
192 char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
193 char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
194 char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
195 char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
196 char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
198 void seek_by_jump(int fd, off_t amount) FAST_FUNC;
199 void seek_by_read(int fd, off_t amount) FAST_FUNC;
201 const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
202 void create_or_remember_symlink(llist_t **symlink_placeholders,
204 const char *linkname) FAST_FUNC;
205 void create_symlinks_from_list(llist_t *list) FAST_FUNC;
207 void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
208 const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
209 const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC;
211 /* A bit of bunzip2 internals are exposed for compressed help support: */
212 typedef struct bunzip_data bunzip_data;
213 int start_bunzip(void *, bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
214 /* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes
215 * in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */
216 int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
217 void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
219 /* Meaning and direction (input/output) of the fields are transformer-specific */
220 typedef struct transformer_state_t {
221 smallint signature_skipped; /* most often referenced member */
223 IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate);
224 USE_FOR_NOMMU(const char *xformer_prog;)
230 size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */
231 size_t mem_output_size;
232 char *mem_output_buf;
235 off_t bytes_in; /* used in unzip code only: needs to know packed size */
237 time_t mtime; /* gunzip code may set this on exit */
238 } transformer_state_t;
240 void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
241 ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
242 ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
243 int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC;
245 IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC;
246 IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC;
247 IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC;
248 IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC;
249 IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC;
250 IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC;
252 char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
253 int bbunpack(char **argv,
254 IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
255 char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
256 const char *expected_ext
258 #define BBUNPK_OPTSTR "cfkvq"
259 #define BBUNPK_OPTSTRLEN 5
260 #define BBUNPK_OPTSTRMASK ((1 << BBUNPK_OPTSTRLEN) - 1)
262 BBUNPK_OPT_STDOUT = 1 << 0,
263 BBUNPK_OPT_FORCE = 1 << 1,
264 /* only some decompressors: */
265 BBUNPK_OPT_KEEP = 1 << 2,
266 BBUNPK_OPT_VERBOSE = 1 << 3,
267 BBUNPK_OPT_QUIET = 1 << 4,
268 /* not included in BBUNPK_OPTSTR: */
269 BBUNPK_OPT_DECOMPRESS = 1 << 5,
270 BBUNPK_OPT_TEST = 1 << 6,
271 BBUNPK_SEAMLESS_MAGIC = (1 << 31) * ENABLE_ZCAT * SEAMLESS_COMPRESSION,
274 void check_errors_in_children(int signo);
276 void fork_transformer(int fd,
277 int signature_skipped,
278 IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
280 #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer))
281 #define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer))
283 void fork_transformer(int fd, const char *transform_prog) FAST_FUNC;
284 #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog))
285 /* fork_transformer_with_no_sig() does not exist on NOMMU */
289 POP_SAVED_FUNCTION_VISIBILITY