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freebsd-dev/lib/libarchive/archive.h.in
Tim Kientzle 37320c7575 Overhaul of 'ar' support: 
* use "AR_GNU" as the format name instead of AR_SVR4 (it's what everyone is going to call it anyway)
  * Simplify numeric parsing to unsigned (none of the numeric values should ever be negative); don't run off end of numeric fields.
  * Finish parsing the common header fields before the next I/O request (which might dump the contents)
  * Be smarter about format guessing and trimming filenames.
  * Most of the magic values are only used in one place, so just inline them.
  * Many more comments.
  * Be smarter about handling damaged entries; return something reasonable.
  * Call it a "filename table" instead of a "string table"
  * Update tests.

Enable selection of 'ar', 'arbsd', and 'argnu' formats by name
(this allows bsdtar to create ar format archives).

The 'ar' writer still needs some work; it should reject
entries that aren't regular files and should probably also
strip leading paths from filenames.
2007-04-14 22:34:10 +00:00

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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef ARCHIVE_H_INCLUDED
#define ARCHIVE_H_INCLUDED
/*
* This header file corresponds to:
* Library version @VERSION@
* Shared library version @SHLIB_MAJOR@
*/
#include <sys/types.h> /* Linux requires this for off_t */
@ARCHIVE_H_INCLUDE_INTTYPES_H@
#include <stdio.h> /* For FILE * */
#ifndef _WIN32
#include <unistd.h> /* For ssize_t and size_t */
#else
typedef long ssize_t;
typedef unsigned int uid_t;
typedef unsigned int gid_t;
typedef unsigned short mode_t;
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* If ARCHIVE_API_VERSION != archive_api_version(), then the library you
* were linked with is using an incompatible API to the one you were
* compiled with. This is almost certainly a fatal problem.
*
* ARCHIVE_API_FEATURE is incremented with each significant feature
* addition, so you can test (at compile or run time) if a particular
* feature is implemented. It's no big deal if ARCHIVE_API_FEATURE !=
* archive_api_feature(), as long as both are high enough to include
* the features you're relying on. Specific values of FEATURE are
* documented here:
*
* 1 - Version tests are available.
* 2 - archive_{read,write}_close available separately from _finish.
* 3 - open_memory, open_memory2, open_FILE, open_fd available
* 5 - archive_write_disk interface available
*/
#define ARCHIVE_API_VERSION @ARCHIVE_API_MAJOR@
int archive_api_version(void);
#define ARCHIVE_API_FEATURE @ARCHIVE_API_MINOR@
int archive_api_feature(void);
/* Textual name/version of the library. */
#define ARCHIVE_LIBRARY_VERSION "libarchive @VERSION@"
const char * archive_version(void);
#define ARCHIVE_BYTES_PER_RECORD 512
#define ARCHIVE_DEFAULT_BYTES_PER_BLOCK 10240
/* Declare our basic types. */
struct archive;
struct archive_entry;
/*
* Error codes: Use archive_errno() and archive_error_string()
* to retrieve details. Unless specified otherwise, all functions
* that return 'int' use these codes.
*/
#define ARCHIVE_EOF 1 /* Found end of archive. */
#define ARCHIVE_OK 0 /* Operation was successful. */
#define ARCHIVE_RETRY (-10) /* Retry might succeed. */
#define ARCHIVE_WARN (-20) /* Partial success. */
/* For example, if write_header "fails", then you can't push data. */
#define ARCHIVE_FAILED (-25) /* Current operation cannot complete. */
#define ARCHIVE_FATAL (-30) /* No more operations are possible. */
/*
* As far as possible, archive_errno returns standard platform errno codes.
* Of course, the details vary by platform, so the actual definitions
* here are stored in "archive_platform.h". The symbols are listed here
* for reference; as a rule, clients should not need to know the exact
* platform-dependent error code.
*/
/* Unrecognized or invalid file format. */
/* #define ARCHIVE_ERRNO_FILE_FORMAT */
/* Illegal usage of the library. */
/* #define ARCHIVE_ERRNO_PROGRAMMER_ERROR */
/* Unknown or unclassified error. */
/* #define ARCHIVE_ERRNO_MISC */
/*
* Callbacks are invoked to automatically read/skip/write/open/close the
* archive. You can provide your own for complex tasks (like breaking
* archives across multiple tapes) or use standard ones built into the
* library.
*/
/* Returns pointer and size of next block of data from archive. */
typedef ssize_t archive_read_callback(struct archive *, void *_client_data,
const void **_buffer);
/* Skips at most request bytes from archive and returns the skipped amount */
#if ARCHIVE_API_VERSION < 2
typedef ssize_t archive_skip_callback(struct archive *, void *_client_data,
size_t request);
#else
typedef off_t archive_skip_callback(struct archive *, void *_client_data,
off_t request);
#endif
/* Returns size actually written, zero on EOF, -1 on error. */
typedef ssize_t archive_write_callback(struct archive *, void *_client_data,
const void *_buffer, size_t _length);
typedef int archive_open_callback(struct archive *, void *_client_data);
typedef int archive_close_callback(struct archive *, void *_client_data);
/*
* Codes for archive_compression.
*/
#define ARCHIVE_COMPRESSION_NONE 0
#define ARCHIVE_COMPRESSION_GZIP 1
#define ARCHIVE_COMPRESSION_BZIP2 2
#define ARCHIVE_COMPRESSION_COMPRESS 3
/*
* Codes returned by archive_format.
*
* Top 16 bits identifies the format family (e.g., "tar"); lower
* 16 bits indicate the variant. This is updated by read_next_header.
* Note that the lower 16 bits will often vary from entry to entry.
* In some cases, this variation occurs as libarchive learns more about
* the archive (for example, later entries might utilize extensions that
* weren't necessary earlier in the archive; in this case, libarchive
* will change the format code to indicate the extended format that
* was used). In other cases, it's because different tools have
* modified the archive and so different parts of the archive
* actually have slightly different formts. (Both tar and cpio store
* format codes in each entry, so it is quite possible for each
* entry to be in a different format.)
*/
#define ARCHIVE_FORMAT_BASE_MASK 0xff0000
#define ARCHIVE_FORMAT_CPIO 0x10000
#define ARCHIVE_FORMAT_CPIO_POSIX (ARCHIVE_FORMAT_CPIO | 1)
#define ARCHIVE_FORMAT_CPIO_BIN_LE (ARCHIVE_FORMAT_CPIO | 2)
#define ARCHIVE_FORMAT_CPIO_BIN_BE (ARCHIVE_FORMAT_CPIO | 3)
#define ARCHIVE_FORMAT_CPIO_SVR4_NOCRC (ARCHIVE_FORMAT_CPIO | 4)
#define ARCHIVE_FORMAT_CPIO_SVR4_CRC (ARCHIVE_FORMAT_CPIO | 5)
#define ARCHIVE_FORMAT_SHAR 0x20000
#define ARCHIVE_FORMAT_SHAR_BASE (ARCHIVE_FORMAT_SHAR | 1)
#define ARCHIVE_FORMAT_SHAR_DUMP (ARCHIVE_FORMAT_SHAR | 2)
#define ARCHIVE_FORMAT_TAR 0x30000
#define ARCHIVE_FORMAT_TAR_USTAR (ARCHIVE_FORMAT_TAR | 1)
#define ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE (ARCHIVE_FORMAT_TAR | 2)
#define ARCHIVE_FORMAT_TAR_PAX_RESTRICTED (ARCHIVE_FORMAT_TAR | 3)
#define ARCHIVE_FORMAT_TAR_GNUTAR (ARCHIVE_FORMAT_TAR | 4)
#define ARCHIVE_FORMAT_ISO9660 0x40000
#define ARCHIVE_FORMAT_ISO9660_ROCKRIDGE (ARCHIVE_FORMAT_ISO9660 | 1)
#define ARCHIVE_FORMAT_ZIP 0x50000
#define ARCHIVE_FORMAT_EMPTY 0x60000
#define ARCHIVE_FORMAT_AR 0x70000
#define ARCHIVE_FORMAT_AR_GNU (ARCHIVE_FORMAT_AR | 1)
#define ARCHIVE_FORMAT_AR_BSD (ARCHIVE_FORMAT_AR | 2)
/*-
* Basic outline for reading an archive:
* 1) Ask archive_read_new for an archive reader object.
* 2) Update any global properties as appropriate.
* In particular, you'll certainly want to call appropriate
* archive_read_support_XXX functions.
* 3) Call archive_read_open_XXX to open the archive
* 4) Repeatedly call archive_read_next_header to get information about
* successive archive entries. Call archive_read_data to extract
* data for entries of interest.
* 5) Call archive_read_finish to end processing.
*/
struct archive *archive_read_new(void);
/*
* The archive_read_support_XXX calls enable auto-detect for this
* archive handle. They also link in the necessary support code.
* For example, if you don't want bzlib linked in, don't invoke
* support_compression_bzip2(). The "all" functions provide the
* obvious shorthand.
*/
int archive_read_support_compression_all(struct archive *);
int archive_read_support_compression_bzip2(struct archive *);
int archive_read_support_compression_compress(struct archive *);
int archive_read_support_compression_gzip(struct archive *);
int archive_read_support_compression_none(struct archive *);
int archive_read_support_format_all(struct archive *);
int archive_read_support_format_ar(struct archive *);
int archive_read_support_format_cpio(struct archive *);
int archive_read_support_format_empty(struct archive *);
int archive_read_support_format_gnutar(struct archive *);
int archive_read_support_format_iso9660(struct archive *);
int archive_read_support_format_tar(struct archive *);
int archive_read_support_format_zip(struct archive *);
/* Open the archive using callbacks for archive I/O. */
int archive_read_open(struct archive *, void *_client_data,
archive_open_callback *, archive_read_callback *,
archive_close_callback *);
int archive_read_open2(struct archive *, void *_client_data,
archive_open_callback *, archive_read_callback *,
archive_skip_callback *, archive_close_callback *);
/*
* A variety of shortcuts that invoke archive_read_open() with
* canned callbacks suitable for common situations. The ones that
* accept a block size handle tape blocking correctly.
*/
/* Use this if you know the filename. Note: NULL indicates stdin. */
int archive_read_open_filename(struct archive *,
const char *_filename, size_t _block_size);
/* archive_read_open_file() is a deprecated synonym for ..._open_filename(). */
int archive_read_open_file(struct archive *,
const char *_filename, size_t _block_size);
/* Read an archive that's stored in memory. */
int archive_read_open_memory(struct archive *,
void * buff, size_t size);
/* A more involved version that is only used for internal testing. */
int archive_read_open_memory2(struct archive *a, void *buff,
size_t size, size_t read_size);
/* Read an archive that's already open, using the file descriptor. */
int archive_read_open_fd(struct archive *, int _fd,
size_t _block_size);
/* Read an archive that's already open, using a FILE *. */
/* Note: DO NOT use this with tape drives. */
int archive_read_open_FILE(struct archive *, FILE *_file);
/* Parses and returns next entry header. */
int archive_read_next_header(struct archive *,
struct archive_entry **);
/*
* Retrieve the byte offset in UNCOMPRESSED data where last-read
* header started.
*/
int64_t archive_read_header_position(struct archive *);
/* Read data from the body of an entry. Similar to read(2). */
ssize_t archive_read_data(struct archive *, void *, size_t);
/*
* A zero-copy version of archive_read_data that also exposes the file offset
* of each returned block. Note that the client has no way to specify
* the desired size of the block. The API does guarantee that offsets will
* be strictly increasing and that returned blocks will not overlap.
*/
int archive_read_data_block(struct archive *a,
const void **buff, size_t *size, off_t *offset);
/*-
* Some convenience functions that are built on archive_read_data:
* 'skip': skips entire entry
* 'into_buffer': writes data into memory buffer that you provide
* 'into_fd': writes data to specified filedes
*/
int archive_read_data_skip(struct archive *);
int archive_read_data_into_buffer(struct archive *, void *buffer,
ssize_t len);
int archive_read_data_into_fd(struct archive *, int fd);
/*-
* Convenience function to recreate the current entry (whose header
* has just been read) on disk.
*
* This does quite a bit more than just copy data to disk. It also:
* - Creates intermediate directories as required.
* - Manages directory permissions: non-writable directories will
* be initially created with write permission enabled; when the
* archive is closed, dir permissions are edited to the values specified
* in the archive.
* - Checks hardlinks: hardlinks will not be extracted unless the
* linked-to file was also extracted within the same session. (TODO)
*/
/* The "flags" argument selects optional behavior, 'OR' the flags you want. */
/* Default: Do not try to set owner/group. */
#define ARCHIVE_EXTRACT_OWNER (1)
/* Default: Do obey umask, do not restore SUID/SGID/SVTX bits. */
#define ARCHIVE_EXTRACT_PERM (2)
/* Default: Do not restore mtime/atime. */
#define ARCHIVE_EXTRACT_TIME (4)
/* Default: Replace existing files. */
#define ARCHIVE_EXTRACT_NO_OVERWRITE (8)
/* Default: Try create first, unlink only if create fails with EEXIST. */
#define ARCHIVE_EXTRACT_UNLINK (16)
/* Default: Do not restore ACLs. */
#define ARCHIVE_EXTRACT_ACL (32)
/* Default: Do not restore fflags. */
#define ARCHIVE_EXTRACT_FFLAGS (64)
/* Default: Do not restore xattrs. */
#define ARCHIVE_EXTRACT_XATTR (128)
/* Default: Do not try to guard against extracts redirected by symlinks. */
/* Note: With ARCHIVE_EXTRACT_UNLINK, will remove any intermediate symlink. */
#define ARCHIVE_EXTRACT_SECURE_SYMLINKS (256)
/* Default: Do not reject entries with '..' as path elements. */
#define ARCHIVE_EXTRACT_SECURE_NODOTDOT (512)
int archive_read_extract(struct archive *, struct archive_entry *,
int flags);
void archive_read_extract_set_progress_callback(struct archive *,
void (*_progress_func)(void *), void *_user_data);
/* Record the dev/ino of a file that will not be written. This is
* generally set to the dev/ino of the archive being read. */
void archive_read_extract_set_skip_file(struct archive *,
dev_t, ino_t);
/* Close the file and release most resources. */
int archive_read_close(struct archive *);
/* Release all resources and destroy the object. */
/* Note that archive_read_finish will call archive_read_close for you. */
#if ARCHIVE_API_VERSION > 1
int archive_read_finish(struct archive *);
#else
/* Temporarily allow library to compile with either 1.x or 2.0 API. */
/* Erroneously declared to return void in libarchive 1.x */
void archive_read_finish(struct archive *);
#endif
/*-
* To create an archive:
* 1) Ask archive_write_new for a archive writer object.
* 2) Set any global properties. In particular, you should set
* the compression and format to use.
* 3) Call archive_write_open to open the file (most people
* will use archive_write_open_file or archive_write_open_fd,
* which provide convenient canned I/O callbacks for you).
* 4) For each entry:
* - construct an appropriate struct archive_entry structure
* - archive_write_header to write the header
* - archive_write_data to write the entry data
* 5) archive_write_close to close the output
* 6) archive_write_finish to cleanup the writer and release resources
*/
struct archive *archive_write_new(void);
int archive_write_set_bytes_per_block(struct archive *,
int bytes_per_block);
int archive_write_get_bytes_per_block(struct archive *);
/* XXX This is badly misnamed; suggestions appreciated. XXX */
int archive_write_set_bytes_in_last_block(struct archive *,
int bytes_in_last_block);
int archive_write_get_bytes_in_last_block(struct archive *);
/* The dev/ino of a file that won't be archived. This is used
* to avoid recursively adding an archive to itself. */
int archive_write_set_skip_file(struct archive *, dev_t, ino_t);
int archive_write_set_compression_bzip2(struct archive *);
int archive_write_set_compression_gzip(struct archive *);
int archive_write_set_compression_none(struct archive *);
/* A convenience function to set the format based on the code or name. */
int archive_write_set_format(struct archive *, int format_code);
int archive_write_set_format_by_name(struct archive *,
const char *name);
/* To minimize link pollution, use one or more of the following. */
int archive_write_set_format_ar_bsd(struct archive *);
int archive_write_set_format_ar_svr4(struct archive *);
int archive_write_set_format_cpio(struct archive *);
/* TODO: int archive_write_set_format_old_tar(struct archive *); */
int archive_write_set_format_pax(struct archive *);
int archive_write_set_format_pax_restricted(struct archive *);
int archive_write_set_format_shar(struct archive *);
int archive_write_set_format_shar_dump(struct archive *);
int archive_write_set_format_ustar(struct archive *);
int archive_write_open(struct archive *, void *,
archive_open_callback *, archive_write_callback *,
archive_close_callback *);
int archive_write_open_fd(struct archive *, int _fd);
int archive_write_open_filename(struct archive *, const char *_file);
/* A deprecated synonym for archive_write_open_filename() */
int archive_write_open_file(struct archive *, const char *_file);
int archive_write_open_FILE(struct archive *, FILE *);
/* _buffSize is the size of the buffer, _used refers to a variable that
* will be updated after each write into the buffer. */
int archive_write_open_memory(struct archive *,
void *_buffer, size_t _buffSize, size_t *_used);
/*
* Note that the library will truncate writes beyond the size provided
* to archive_write_header or pad if the provided data is short.
*/
int archive_write_header(struct archive *,
struct archive_entry *);
#if ARCHIVE_API_VERSION > 1
ssize_t archive_write_data(struct archive *, const void *, size_t);
#else
/* Temporarily allow library to compile with either 1.x or 2.0 API. */
/* This was erroneously declared to return "int" in libarchive 1.x. */
int archive_write_data(struct archive *, const void *, size_t);
#endif
ssize_t archive_write_data_block(struct archive *, const void *, size_t, off_t);
int archive_write_finish_entry(struct archive *);
int archive_write_close(struct archive *);
#if ARCHIVE_API_VERSION > 1
int archive_write_finish(struct archive *);
#else
/* Temporarily allow library to compile with either 1.x or 2.0 API. */
/* Return value was incorrect in libarchive 1.x. */
void archive_write_finish(struct archive *);
#endif
/*-
* To create objects on disk:
* 1) Ask archive_write_disk_new for a new archive_write_disk object.
* 2) Set any global properties. In particular, you should set
* the compression and format to use.
* 3) For each entry:
* - construct an appropriate struct archive_entry structure
* - archive_write_header to create the file/dir/etc on disk
* - archive_write_data to write the entry data
* 4) archive_write_finish to cleanup the writer and release resources
*
* In particular, you can use this in conjunction with archive_read()
* to pull entries out of an archive and create them on disk.
*/
struct archive *archive_write_disk_new(void);
/* This file will not be overwritten. */
int archive_write_disk_set_skip_file(struct archive *,
dev_t, ino_t);
/* Set flags to control how the next item gets created. */
int archive_write_disk_set_options(struct archive *,
int flags);
/*
* The lookup functions are given uname/uid (or gname/gid) pairs and
* return a uid (gid) suitable for this system. These are used for
* restoring ownership and for setting ACLs. The default functions
* are naive, they just return the uid/gid. These are small, so reasonable
* for applications that don't need to preserve ownership; they
* are probably also appropriate for applications that are doing
* same-system backup and restore.
*/
/*
* The "standard" lookup functions use common system calls to lookup
* the uname/gname, falling back to the uid/gid if the names can't be
* found. They cache lookups and are reasonably fast, but can be very
* large, so they are not used unless you ask for them. In
* particular, these match the specifications of POSIX "pax" and old
* POSIX "tar".
*/
int archive_write_disk_set_standard_lookup(struct archive *);
/*
* If neither the default (naive) nor the standard (big) functions suit
* your needs, you can write your own and register them. Be sure to
* include a cleanup function if you have allocated private data.
*/
int archive_write_disk_set_group_lookup(struct archive *,
void *private_data,
gid_t (*loookup)(void *, const char *gname, gid_t gid),
void (*cleanup)(void *));
int archive_write_disk_set_user_lookup(struct archive *,
void *private_data,
uid_t (*)(void *, const char *uname, uid_t uid),
void (*cleanup)(void *));
/*
* Accessor functions to read/set various information in
* the struct archive object:
*/
/* Bytes written after compression or read before decompression. */
int64_t archive_position_compressed(struct archive *);
/* Bytes written to compressor or read from decompressor. */
int64_t archive_position_uncompressed(struct archive *);
const char *archive_compression_name(struct archive *);
int archive_compression(struct archive *);
int archive_errno(struct archive *);
const char *archive_error_string(struct archive *);
const char *archive_format_name(struct archive *);
int archive_format(struct archive *);
void archive_clear_error(struct archive *);
void archive_set_error(struct archive *, int _err, const char *fmt, ...);
#ifdef __cplusplus
}
#endif
#endif /* !ARCHIVE_H_INCLUDED */
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