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020465218c
busybox/include/unarchive.h
Denys Vlasenko 26b6ccf340 *: simplify checks for gz/bz2/xz magic 
function                                             old     new   delta
send_tree                                            360     355      -5
rpm2cpio_main                                        249     220     -29
setup_unzip_on_fd                                    150     118     -32
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-66)             Total: -66 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-06-02 14:14:48 +02:00

193 lines
6.8 KiB
C
Raw Blame History

/* 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 = ('B'<<8) + 'Z',
XZ_MAGIC1 = (0xfd<<8) + '7',
XZ_MAGIC2 = ((((('z'<<8) + 'X')<<8) + 'Z')<<8) + 0,
#else
COMPRESS_MAGIC = 0x9d1f,
GZIP_MAGIC = 0x8b1f,
BZIP2_MAGIC = ('Z'<<8) + 'B',
XZ_MAGIC1 = ('7'<<8) + 0xfd,
XZ_MAGIC2 = (((((0<<8) + 'Z')<<8) + 'X')<<8) + 'z',
#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;
/* 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_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_SELINUX
char* tar__global_sctx;
char* tar__next_file_sctx;
# endif
#endif
#if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
uoff_t cpio__blocks;
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_QUIET (1 << 3)
#define ARCHIVE_EXTRACT_NEWER (1 << 4)
#define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
#define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
#define ARCHIVE_NUMERIC_OWNER (1 << 7)
#define ARCHIVE_O_TRUNC (1 << 8)
/* Info struct unpackers can fill out to inform users of thing like
* timestamps of unpacked files */
typedef struct unpack_info_t {
time_t mtime;
} unpack_info_t;
extern archive_handle_t *init_handle(void) FAST_FUNC;
extern char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
extern char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
extern char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
extern char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
extern void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
extern void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
extern void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
extern void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
extern void header_skip(const file_header_t *file_header) FAST_FUNC;
extern void header_list(const file_header_t *file_header) FAST_FUNC;
extern void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
extern char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
extern char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
extern char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
extern char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
extern char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
extern char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
extern void seek_by_jump(int fd, off_t amount) FAST_FUNC;
extern void seek_by_read(int fd, off_t amount) FAST_FUNC;
extern void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
extern const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
extern 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 unsigned char *inbuf, int len) FAST_FUNC;
int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
typedef struct inflate_unzip_result {
off_t bytes_out;
uint32_t crc;
} inflate_unzip_result;
IF_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, off_t compr_size, int src_fd, int dst_fd) FAST_FUNC;
/* xz unpacker takes .xz stream from offset 0 */
IF_DESKTOP(long long) int unpack_xz_stream(int src_fd, int dst_fd) FAST_FUNC;
/* lzma unpacker takes .lzma stream from offset 0 */
IF_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd) FAST_FUNC;
/* the rest wants 2 first bytes already skipped by the caller */
IF_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream_with_info(int src_fd, int dst_fd, unpack_info_t *info) FAST_FUNC;
IF_DESKTOP(long long) int unpack_Z_stream(int src_fd, int dst_fd) FAST_FUNC;
/* wrapper which checks first two bytes to be "BZ" */
IF_DESKTOP(long long) int unpack_bz2_stream_prime(int src_fd, int dst_fd) 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)(unpack_info_t *info),
char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
const char *expected_ext
) FAST_FUNC;
#if BB_MMU
void open_transformer(int fd,
IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd)) FAST_FUNC;
#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transformer)
#else
void open_transformer(int src_fd, const char *transform_prog) FAST_FUNC;
#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transform_prog)
#endif
POP_SAVED_FUNCTION_VISIBILITY
#endif
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