/* vi: set sw=4 ts=4: */ #ifndef UNARCHIVE_H #define UNARCHIVE_H 1 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN enum { #if BB_BIG_ENDIAN COMPRESS_MAGIC = 0x1f9d, GZIP_MAGIC = 0x1f8b, BZIP2_MAGIC = 256 * 'B' + 'Z', /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */ /* More info at: http://tukaani.org/xz/xz-file-format.txt */ XZ_MAGIC1 = 256 * 0xfd + '7', XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0, /* Different form: 32 bits, then 16 bits: */ /* (unsigned) cast suppresses "integer overflow in expression" warning */ XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X', XZ_MAGIC2a = 256 * 'Z' + 0, #else COMPRESS_MAGIC = 0x9d1f, GZIP_MAGIC = 0x8b1f, BZIP2_MAGIC = 'B' + 'Z' * 256, XZ_MAGIC1 = 0xfd + '7' * 256, XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256, XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256, XZ_MAGIC2a = 'Z' + 0 * 256, #endif }; typedef struct file_header_t { char *name; char *link_target; #if ENABLE_FEATURE_TAR_UNAME_GNAME char *tar__uname; char *tar__gname; #endif off_t size; uid_t uid; gid_t gid; mode_t mode; time_t mtime; dev_t device; } file_header_t; struct hardlinks_t; typedef struct archive_handle_t { /* Flags. 1st since it is most used member */ unsigned ah_flags; /* The raw stream as read from disk or stdin */ int src_fd; /* Define if the header and data component should be processed */ char FAST_FUNC (*filter)(struct archive_handle_t *); /* List of files that have been accepted */ llist_t *accept; /* List of files that have been rejected */ llist_t *reject; /* List of files that have successfully been worked on */ llist_t *passed; /* Currently processed file's header */ file_header_t *file_header; /* List of symlink placeholders */ llist_t *symlink_placeholders; /* Process the header component, e.g. tar -t */ void FAST_FUNC (*action_header)(const file_header_t *); /* Process the data component, e.g. extract to filesystem */ void FAST_FUNC (*action_data)(struct archive_handle_t *); /* Function that skips data */ void FAST_FUNC (*seek)(int fd, off_t amount); /* Count processed bytes */ off_t offset; /* Archiver specific. Can make it a union if it ever gets big */ #if ENABLE_FEATURE_TAR_LONG_OPTIONS unsigned tar__strip_components; #endif #define PAX_NEXT_FILE 0 #define PAX_GLOBAL 1 #if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB smallint tar__end; # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS char* tar__longname; char* tar__linkname; # endif # if ENABLE_FEATURE_TAR_TO_COMMAND char* tar__to_command; const char* tar__to_command_shell; # endif # if ENABLE_FEATURE_TAR_SELINUX char* tar__sctx[2]; # endif #endif #if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM uoff_t cpio__blocks; struct bb_uidgid_t cpio__owner; struct hardlinks_t *cpio__hardlinks_to_create; struct hardlinks_t *cpio__created_hardlinks; #endif #if ENABLE_DPKG || ENABLE_DPKG_DEB /* Temporary storage */ char *dpkg__buffer; /* How to process any sub archive, e.g. get_header_tar_gz */ char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *); /* Contains the handle to a sub archive */ struct archive_handle_t *dpkg__sub_archive; #endif #if ENABLE_FEATURE_AR_CREATE const char *ar__name; struct archive_handle_t *ar__out; #endif } archive_handle_t; /* bits in ah_flags */ #define ARCHIVE_RESTORE_DATE (1 << 0) #define ARCHIVE_CREATE_LEADING_DIRS (1 << 1) #define ARCHIVE_UNLINK_OLD (1 << 2) #define ARCHIVE_EXTRACT_NEWER (1 << 3) #define ARCHIVE_DONT_RESTORE_OWNER (1 << 4) #define ARCHIVE_DONT_RESTORE_PERM (1 << 5) #define ARCHIVE_NUMERIC_OWNER (1 << 6) #define ARCHIVE_O_TRUNC (1 << 7) #define ARCHIVE_REMEMBER_NAMES (1 << 8) #if ENABLE_RPM #define ARCHIVE_REPLACE_VIA_RENAME (1 << 9) #endif /* POSIX tar Header Block, from POSIX 1003.1-1990 */ #define TAR_BLOCK_SIZE 512 #define NAME_SIZE 100 #define NAME_SIZE_STR "100" typedef struct tar_header_t { /* byte offset */ char name[NAME_SIZE]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[NAME_SIZE]; /* 157-256 */ /* POSIX: "ustar" NUL "00" */ /* GNU tar: "ustar " NUL */ /* Normally it's defined as magic[6] followed by * version[2], but we put them together to save code. */ char magic[8]; /* 257-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */ } tar_header_t; struct BUG_tar_header { char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1]; }; extern const char cpio_TRAILER[]; archive_handle_t *init_handle(void) FAST_FUNC; char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC; char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC; char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC; char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC; void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC; void data_skip(archive_handle_t *archive_handle) FAST_FUNC; void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC; void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC; void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC; void header_skip(const file_header_t *file_header) FAST_FUNC; void header_list(const file_header_t *file_header) FAST_FUNC; void header_verbose_list(const file_header_t *file_header) FAST_FUNC; char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC; char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC; char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC; void seek_by_jump(int fd, off_t amount) FAST_FUNC; void seek_by_read(int fd, off_t amount) FAST_FUNC; const char *strip_unsafe_prefix(const char *str) FAST_FUNC; void create_or_remember_symlink(llist_t **symlink_placeholders, const char *target, const char *linkname) FAST_FUNC; void create_symlinks_from_list(llist_t *list) FAST_FUNC; void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC; const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC; const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC; /* A bit of bunzip2 internals are exposed for compressed help support: */ typedef struct bunzip_data bunzip_data; int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC; /* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes * in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */ int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC; void dealloc_bunzip(bunzip_data *bd) FAST_FUNC; /* Meaning and direction (input/output) of the fields are transformer-specific */ typedef struct transformer_state_t { smallint signature_skipped; /* most often referenced member */ IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate); USE_FOR_NOMMU(const char *xformer_prog;) /* Source */ int src_fd; /* Output */ int dst_fd; size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */ size_t mem_output_size; char *mem_output_buf; off_t bytes_out; off_t bytes_in; /* used in unzip code only: needs to know packed size */ uint32_t crc32; time_t mtime; /* gunzip code may set this on exit */ } transformer_state_t; void init_transformer_state(transformer_state_t *xstate) FAST_FUNC; ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC; ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC; int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC; IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC; IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC; IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC; IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC; IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC; IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC; char* append_ext(char *filename, const char *expected_ext) FAST_FUNC; int bbunpack(char **argv, IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate), char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext), const char *expected_ext ) FAST_FUNC; void check_errors_in_children(int signo); #if BB_MMU void fork_transformer(int fd, int signature_skipped, IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate) ) FAST_FUNC; #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer)) #define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer)) #else void fork_transformer(int fd, const char *transform_prog) FAST_FUNC; #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog)) /* fork_transformer_with_no_sig() does not exist on NOMMU */ #endif POP_SAVED_FUNCTION_VISIBILITY #endif