297 lines
10 KiB
C
297 lines
10 KiB
C
/* vi: set sw=4 ts=4: */
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#ifndef UNARCHIVE_H
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#define UNARCHIVE_H 1
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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enum {
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#if BB_BIG_ENDIAN
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COMPRESS_MAGIC = 0x1f9d,
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GZIP_MAGIC = 0x1f8b,
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BZIP2_MAGIC = 256 * 'B' + 'Z',
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/* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
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/* More info at: http://tukaani.org/xz/xz-file-format.txt */
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XZ_MAGIC1 = 256 * 0xfd + '7',
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XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
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/* Different form: 32 bits, then 16 bits: */
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/* (unsigned) cast suppresses "integer overflow in expression" warning */
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XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
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XZ_MAGIC2a = 256 * 'Z' + 0,
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#else
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COMPRESS_MAGIC = 0x9d1f,
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GZIP_MAGIC = 0x8b1f,
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BZIP2_MAGIC = 'B' + 'Z' * 256,
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XZ_MAGIC1 = 0xfd + '7' * 256,
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XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
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XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
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XZ_MAGIC2a = 'Z' + 0 * 256,
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#endif
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};
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typedef struct file_header_t {
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char *name;
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char *link_target;
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#if ENABLE_FEATURE_TAR_UNAME_GNAME
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char *tar__uname;
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char *tar__gname;
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#endif
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off_t size;
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uid_t uid;
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gid_t gid;
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mode_t mode;
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time_t mtime;
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dev_t device;
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} file_header_t;
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struct hardlinks_t;
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typedef struct archive_handle_t {
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/* Flags. 1st since it is most used member */
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unsigned ah_flags;
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/* The raw stream as read from disk or stdin */
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int src_fd;
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/* Define if the header and data component should be processed */
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char FAST_FUNC (*filter)(struct archive_handle_t *);
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/* List of files that have been accepted */
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llist_t *accept;
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/* List of files that have been rejected */
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llist_t *reject;
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/* List of files that have successfully been worked on */
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llist_t *passed;
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/* Currently processed file's header */
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file_header_t *file_header;
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/* List of link placeholders */
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llist_t *link_placeholders;
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/* Process the header component, e.g. tar -t */
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void FAST_FUNC (*action_header)(const file_header_t *);
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/* Process the data component, e.g. extract to filesystem */
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void FAST_FUNC (*action_data)(struct archive_handle_t *);
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/* Function that skips data */
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void FAST_FUNC (*seek)(int fd, off_t amount);
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/* Count processed bytes */
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off_t offset;
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/* Archiver specific. Can make it a union if it ever gets big */
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#if ENABLE_FEATURE_TAR_LONG_OPTIONS
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unsigned tar__strip_components;
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#endif
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#define PAX_NEXT_FILE 0
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#define PAX_GLOBAL 1
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#if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB
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smallint tar__end;
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# if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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char* tar__longname;
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char* tar__linkname;
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# endif
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# if ENABLE_FEATURE_TAR_TO_COMMAND
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char* tar__to_command;
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const char* tar__to_command_shell;
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# endif
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# if ENABLE_FEATURE_TAR_SELINUX
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char* tar__sctx[2];
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# endif
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#endif
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#if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
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uoff_t cpio__blocks;
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struct bb_uidgid_t cpio__owner;
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struct hardlinks_t *cpio__hardlinks_to_create;
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struct hardlinks_t *cpio__created_hardlinks;
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#endif
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#if ENABLE_DPKG || ENABLE_DPKG_DEB
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/* Temporary storage */
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char *dpkg__buffer;
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/* How to process any sub archive, e.g. get_header_tar_gz */
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char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *);
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/* Contains the handle to a sub archive */
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struct archive_handle_t *dpkg__sub_archive;
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#endif
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#if ENABLE_FEATURE_AR_CREATE
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const char *ar__name;
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struct archive_handle_t *ar__out;
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#endif
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#if ENABLE_FEATURE_AR_LONG_FILENAMES
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char *ar__long_names;
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unsigned ar__long_name_size;
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#endif
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} archive_handle_t;
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/* bits in ah_flags */
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#define ARCHIVE_RESTORE_DATE (1 << 0)
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#define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
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#define ARCHIVE_UNLINK_OLD (1 << 2)
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#define ARCHIVE_EXTRACT_NEWER (1 << 3)
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#define ARCHIVE_DONT_RESTORE_OWNER (1 << 4)
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#define ARCHIVE_DONT_RESTORE_PERM (1 << 5)
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#define ARCHIVE_NUMERIC_OWNER (1 << 6)
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#define ARCHIVE_O_TRUNC (1 << 7)
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#define ARCHIVE_REMEMBER_NAMES (1 << 8)
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#if ENABLE_RPM
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#define ARCHIVE_REPLACE_VIA_RENAME (1 << 9)
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#endif
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/* POSIX tar Header Block, from POSIX 1003.1-1990 */
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#define TAR_BLOCK_SIZE 512
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#define NAME_SIZE 100
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#define NAME_SIZE_STR "100"
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typedef struct tar_header_t { /* byte offset */
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char name[NAME_SIZE]; /* 0-99 */
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char mode[8]; /* 100-107 */
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char uid[8]; /* 108-115 */
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char gid[8]; /* 116-123 */
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char size[12]; /* 124-135 */
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char mtime[12]; /* 136-147 */
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char chksum[8]; /* 148-155 */
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char typeflag; /* 156-156 */
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char linkname[NAME_SIZE]; /* 157-256 */
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/* POSIX: "ustar" NUL "00" */
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/* GNU tar: "ustar " NUL */
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/* Normally it's defined as magic[6] followed by
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* version[2], but we put them together to save code.
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*/
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char magic[8]; /* 257-264 */
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char uname[32]; /* 265-296 */
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char gname[32]; /* 297-328 */
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char devmajor[8]; /* 329-336 */
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char devminor[8]; /* 337-344 */
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char prefix[155]; /* 345-499 */
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char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
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} tar_header_t;
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struct BUG_tar_header {
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char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
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};
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extern const char cpio_TRAILER[];
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archive_handle_t *init_handle(void) FAST_FUNC;
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char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
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char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
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char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
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char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
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void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
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void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
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void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
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void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
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void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC;
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void header_skip(const file_header_t *file_header) FAST_FUNC;
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void header_list(const file_header_t *file_header) FAST_FUNC;
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void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
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char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
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char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
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void seek_by_jump(int fd, off_t amount) FAST_FUNC;
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void seek_by_read(int fd, off_t amount) FAST_FUNC;
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const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
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void create_or_remember_link(llist_t **link_placeholders,
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const char *target,
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const char *linkname,
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int hard_link) FAST_FUNC;
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void create_links_from_list(llist_t *list) FAST_FUNC;
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void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
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const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
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const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC;
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/* A bit of bunzip2 internals are exposed for compressed help support: */
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typedef struct bunzip_data bunzip_data;
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int start_bunzip(void *, bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
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/* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes
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* in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */
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int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
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void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
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/* Meaning and direction (input/output) of the fields are transformer-specific */
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typedef struct transformer_state_t {
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smallint signature_skipped; /* most often referenced member */
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IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate);
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USE_FOR_NOMMU(const char *xformer_prog;)
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/* Source */
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int src_fd;
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/* Output */
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int dst_fd;
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size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */
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size_t mem_output_size;
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char *mem_output_buf;
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off_t bytes_out;
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off_t bytes_in; /* used in unzip code only: needs to know packed size */
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uint32_t crc32;
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time_t mtime; /* gunzip code may set this on exit */
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} transformer_state_t;
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void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
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ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC;
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IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC;
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IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC;
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IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC;
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IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC;
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IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC;
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IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC;
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char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
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int bbunpack(char **argv,
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IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
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char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
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const char *expected_ext
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) FAST_FUNC;
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#define BBUNPK_OPTSTR "cfkvq"
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#define BBUNPK_OPTSTRLEN 5
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#define BBUNPK_OPTSTRMASK ((1 << BBUNPK_OPTSTRLEN) - 1)
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enum {
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BBUNPK_OPT_STDOUT = 1 << 0,
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BBUNPK_OPT_FORCE = 1 << 1,
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/* only some decompressors: */
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BBUNPK_OPT_KEEP = 1 << 2,
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BBUNPK_OPT_VERBOSE = 1 << 3,
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BBUNPK_OPT_QUIET = 1 << 4,
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/* not included in BBUNPK_OPTSTR: */
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BBUNPK_OPT_DECOMPRESS = 1 << 5,
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BBUNPK_OPT_TEST = 1 << 6,
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BBUNPK_SEAMLESS_MAGIC = (1 << 31) * ENABLE_ZCAT * SEAMLESS_COMPRESSION,
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};
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void check_errors_in_children(int signo);
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#if BB_MMU
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void fork_transformer(int fd,
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int signature_skipped,
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IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
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) FAST_FUNC;
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#define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer))
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#define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer))
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#else
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void fork_transformer(int fd, const char *transform_prog) FAST_FUNC;
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#define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog))
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/* fork_transformer_with_no_sig() does not exist on NOMMU */
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#endif
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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