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minix/lib/libarchive/archive_entry.h
Ben Gras 470ab03b86 libarchive port by Gautam Tirumala.
2010-07-13 19:17:02 +00:00

541 lines
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/*-
* Copyright (c) 2003-2008 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: head/lib/libarchive/archive_entry.h 201096 2009-12-28 02:41:27Z kientzle $
*/
#ifndef ARCHIVE_ENTRY_H_INCLUDED
#define ARCHIVE_ENTRY_H_INCLUDED
/*
* Note: archive_entry.h is for use outside of libarchive; the
* configuration headers (config.h, archive_platform.h, etc.) are
* purely internal. Do NOT use HAVE_XXX configuration macros to
* control the behavior of this header! If you must conditionalize,
* use predefined compiler and/or platform macros.
*/
#include <sys/types.h>
#include <stddef.h> /* for wchar_t */
#include <time.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#endif
/* Get appropriate definitions of standard POSIX-style types. */
/* These should match the types used in 'struct stat' */
#if defined(_WIN32) && !defined(__CYGWIN__)
#define __LA_INT64_T __int64
# if defined(__BORLANDC__)
# define __LA_UID_T uid_t
# define __LA_GID_T gid_t
# define __LA_DEV_T dev_t
# define __LA_MODE_T mode_t
# else
# define __LA_UID_T short
# define __LA_GID_T short
# define __LA_DEV_T unsigned int
# define __LA_MODE_T unsigned short
# endif
#elif defined(__minix)
#define __LA_UID_T uid_t
#define __LA_GID_T gid_t
#define __LA_DEV_T dev_t
#define __LA_MODE_T mode_t
#else
#include <unistd.h>
#define __LA_INT64_T int64_t
#define __LA_UID_T uid_t
#define __LA_GID_T gid_t
#define __LA_DEV_T dev_t
#define __LA_MODE_T mode_t
#endif
/*
* XXX Is this defined for all Windows compilers? If so, in what
* header? It would be nice to remove the __LA_INO_T indirection and
* just use plain ino_t everywhere. Likewise for the other types just
* above.
*/
#define __LA_INO_T ino_t
/*
* On Windows, define LIBARCHIVE_STATIC if you're building or using a
* .lib. The default here assumes you're building a DLL. Only
* libarchive source should ever define __LIBARCHIVE_BUILD.
*/
#if ((defined __WIN32__) || (defined _WIN32) || defined(__CYGWIN__)) && (!defined LIBARCHIVE_STATIC)
# ifdef __LIBARCHIVE_BUILD
# ifdef __GNUC__
# define __LA_DECL __attribute__((dllexport)) extern
# else
# define __LA_DECL __declspec(dllexport)
# endif
# else
# ifdef __GNUC__
# define __LA_DECL __attribute__((dllimport)) extern
# else
# define __LA_DECL __declspec(dllimport)
# endif
# endif
#else
/* Static libraries on all platforms and shared libraries on non-Windows. */
# define __LA_DECL
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* Description of an archive entry.
*
* You can think of this as "struct stat" with some text fields added in.
*
* TODO: Add "comment", "charset", and possibly other entries that are
* supported by "pax interchange" format. However, GNU, ustar, cpio,
* and other variants don't support these features, so they're not an
* excruciatingly high priority right now.
*
* TODO: "pax interchange" format allows essentially arbitrary
* key/value attributes to be attached to any entry. Supporting
* such extensions may make this library useful for special
* applications (e.g., a package manager could attach special
* package-management attributes to each entry).
*/
struct archive_entry;
/*
* File-type constants. These are returned from archive_entry_filetype()
* and passed to archive_entry_set_filetype().
*
* These values match S_XXX defines on every platform I've checked,
* including Windows, AIX, Linux, Solaris, and BSD. They're
* (re)defined here because platforms generally don't define the ones
* they don't support. For example, Windows doesn't define S_IFLNK or
* S_IFBLK. Instead of having a mass of conditional logic and system
* checks to define any S_XXX values that aren't supported locally,
* I've just defined a new set of such constants so that
* libarchive-based applications can manipulate and identify archive
* entries properly even if the hosting platform can't store them on
* disk.
*
* These values are also used directly within some portable formats,
* such as cpio. If you find a platform that varies from these, the
* correct solution is to leave these alone and translate from these
* portable values to platform-native values when entries are read from
* or written to disk.
*/
#define AE_IFMT 0170000
#define AE_IFREG 0100000
#define AE_IFLNK 0120000
#define AE_IFSOCK 0140000
#define AE_IFCHR 0020000
#define AE_IFBLK 0060000
#define AE_IFDIR 0040000
#define AE_IFIFO 0010000
/*
* Basic object manipulation
*/
__LA_DECL struct archive_entry *archive_entry_clear(struct archive_entry *);
/* The 'clone' function does a deep copy; all of the strings are copied too. */
__LA_DECL struct archive_entry *archive_entry_clone(struct archive_entry *);
__LA_DECL void archive_entry_free(struct archive_entry *);
__LA_DECL struct archive_entry *archive_entry_new(void);
/*
* Retrieve fields from an archive_entry.
*
* There are a number of implicit conversions among these fields. For
* example, if a regular string field is set and you read the _w wide
* character field, the entry will implicitly convert narrow-to-wide
* using the current locale. Similarly, dev values are automatically
* updated when you write devmajor or devminor and vice versa.
*
* In addition, fields can be "set" or "unset." Unset string fields
* return NULL, non-string fields have _is_set() functions to test
* whether they've been set. You can "unset" a string field by
* assigning NULL; non-string fields have _unset() functions to
* unset them.
*
* Note: There is one ambiguity in the above; string fields will
* also return NULL when implicit character set conversions fail.
* This is usually what you want.
*/
__LA_DECL time_t archive_entry_atime(struct archive_entry *);
__LA_DECL long archive_entry_atime_nsec(struct archive_entry *);
__LA_DECL int archive_entry_atime_is_set(struct archive_entry *);
__LA_DECL time_t archive_entry_birthtime(struct archive_entry *);
__LA_DECL long archive_entry_birthtime_nsec(struct archive_entry *);
__LA_DECL int archive_entry_birthtime_is_set(struct archive_entry *);
__LA_DECL time_t archive_entry_ctime(struct archive_entry *);
__LA_DECL long archive_entry_ctime_nsec(struct archive_entry *);
__LA_DECL int archive_entry_ctime_is_set(struct archive_entry *);
__LA_DECL dev_t archive_entry_dev(struct archive_entry *);
__LA_DECL dev_t archive_entry_devmajor(struct archive_entry *);
__LA_DECL dev_t archive_entry_devminor(struct archive_entry *);
__LA_DECL __LA_MODE_T archive_entry_filetype(struct archive_entry *);
__LA_DECL void archive_entry_fflags(struct archive_entry *,
unsigned long * /* set */,
unsigned long * /* clear */);
__LA_DECL const char *archive_entry_fflags_text(struct archive_entry *);
__LA_DECL __LA_GID_T archive_entry_gid(struct archive_entry *);
__LA_DECL const char *archive_entry_gname(struct archive_entry *);
__LA_DECL const wchar_t *archive_entry_gname_w(struct archive_entry *);
__LA_DECL const char *archive_entry_hardlink(struct archive_entry *);
__LA_DECL const wchar_t *archive_entry_hardlink_w(struct archive_entry *);
__LA_DECL __LA_INO_T archive_entry_ino(struct archive_entry *);
#ifndef __minix
__LA_DECL __LA_INT64_T archive_entry_ino64(struct archive_entry *);
#endif
__LA_DECL __LA_MODE_T archive_entry_mode(struct archive_entry *);
__LA_DECL time_t archive_entry_mtime(struct archive_entry *);
__LA_DECL long archive_entry_mtime_nsec(struct archive_entry *);
__LA_DECL int archive_entry_mtime_is_set(struct archive_entry *);
__LA_DECL unsigned int archive_entry_nlink(struct archive_entry *);
__LA_DECL const char *archive_entry_pathname(struct archive_entry *);
__LA_DECL const wchar_t *archive_entry_pathname_w(struct archive_entry *);
__LA_DECL dev_t archive_entry_rdev(struct archive_entry *);
__LA_DECL dev_t archive_entry_rdevmajor(struct archive_entry *);
__LA_DECL dev_t archive_entry_rdevminor(struct archive_entry *);
__LA_DECL const char *archive_entry_sourcepath(struct archive_entry *);
#ifndef __minix
__LA_DECL __LA_INT64_T archive_entry_size(struct archive_entry *);
#else
__LA_DECL ssize_t archive_entry_size(struct archive_entry *);
#endif
__LA_DECL int archive_entry_size_is_set(struct archive_entry *);
__LA_DECL const char *archive_entry_strmode(struct archive_entry *);
__LA_DECL const char *archive_entry_symlink(struct archive_entry *);
__LA_DECL const wchar_t *archive_entry_symlink_w(struct archive_entry *);
__LA_DECL __LA_UID_T archive_entry_uid(struct archive_entry *);
__LA_DECL const char *archive_entry_uname(struct archive_entry *);
__LA_DECL const wchar_t *archive_entry_uname_w(struct archive_entry *);
/*
* Set fields in an archive_entry.
*
* Note that string 'set' functions do not copy the string, only the pointer.
* In contrast, 'copy' functions do copy the object pointed to.
*
* Note: As of libarchive 2.4, 'set' functions do copy the string and
* are therefore exact synonyms for the 'copy' versions. The 'copy'
* names will be retired in libarchive 3.0.
*/
__LA_DECL void archive_entry_set_atime(struct archive_entry *, time_t, long);
__LA_DECL void archive_entry_unset_atime(struct archive_entry *);
#if defined(_WIN32) && !defined(__CYGWIN__)
__LA_DECL void archive_entry_copy_bhfi(struct archive_entry *,
BY_HANDLE_FILE_INFORMATION *);
#endif
__LA_DECL void archive_entry_set_birthtime(struct archive_entry *, time_t, long);
__LA_DECL void archive_entry_unset_birthtime(struct archive_entry *);
__LA_DECL void archive_entry_set_ctime(struct archive_entry *, time_t, long);
__LA_DECL void archive_entry_unset_ctime(struct archive_entry *);
__LA_DECL void archive_entry_set_dev(struct archive_entry *, dev_t);
__LA_DECL void archive_entry_set_devmajor(struct archive_entry *, dev_t);
__LA_DECL void archive_entry_set_devminor(struct archive_entry *, dev_t);
__LA_DECL void archive_entry_set_filetype(struct archive_entry *, unsigned int);
__LA_DECL void archive_entry_set_fflags(struct archive_entry *,
unsigned long /* set */, unsigned long /* clear */);
/* Returns pointer to start of first invalid token, or NULL if none. */
/* Note that all recognized tokens are processed, regardless. */
__LA_DECL const char *archive_entry_copy_fflags_text(struct archive_entry *,
const char *);
__LA_DECL const wchar_t *archive_entry_copy_fflags_text_w(struct archive_entry *,
const wchar_t *);
__LA_DECL void archive_entry_set_gid(struct archive_entry *, __LA_GID_T);
__LA_DECL void archive_entry_set_gname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_gname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_gname_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_gname_utf8(struct archive_entry *, const char *);
__LA_DECL void archive_entry_set_hardlink(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_hardlink(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_hardlink_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_hardlink_utf8(struct archive_entry *, const char *);
#if ARCHIVE_VERSION_NUMBER >= 3000000
/* Starting with libarchive 3.0, this will be synonym for ino64. */
__LA_DECL void archive_entry_set_ino(struct archive_entry *, __LA_INT64_T);
#else
__LA_DECL void archive_entry_set_ino(struct archive_entry *, unsigned long);
#endif
#ifndef __minix
__LA_DECL void archive_entry_set_ino64(struct archive_entry *, __LA_INT64_T);
#endif
__LA_DECL void archive_entry_set_link(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_link(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_link_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_link_utf8(struct archive_entry *, const char *);
__LA_DECL void archive_entry_set_mode(struct archive_entry *, __LA_MODE_T);
__LA_DECL void archive_entry_set_mtime(struct archive_entry *, time_t, long);
__LA_DECL void archive_entry_unset_mtime(struct archive_entry *);
__LA_DECL void archive_entry_set_nlink(struct archive_entry *, unsigned int);
__LA_DECL void archive_entry_set_pathname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_pathname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_pathname_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_pathname_utf8(struct archive_entry *, const char *);
__LA_DECL void archive_entry_set_perm(struct archive_entry *, __LA_MODE_T);
__LA_DECL void archive_entry_set_rdev(struct archive_entry *, dev_t);
__LA_DECL void archive_entry_set_rdevmajor(struct archive_entry *, dev_t);
__LA_DECL void archive_entry_set_rdevminor(struct archive_entry *, dev_t);
#ifndef __minix
__LA_DECL void archive_entry_set_size(struct archive_entry *, __LA_INT64_T);
#else
__LA_DECL void archive_entry_set_size(struct archive_entry *, ssize_t);
#endif
__LA_DECL void archive_entry_unset_size(struct archive_entry *);
__LA_DECL void archive_entry_copy_sourcepath(struct archive_entry *, const char *);
__LA_DECL void archive_entry_set_symlink(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_symlink(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_symlink_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_symlink_utf8(struct archive_entry *, const char *);
__LA_DECL void archive_entry_set_uid(struct archive_entry *, __LA_UID_T);
__LA_DECL void archive_entry_set_uname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_uname(struct archive_entry *, const char *);
__LA_DECL void archive_entry_copy_uname_w(struct archive_entry *, const wchar_t *);
__LA_DECL int archive_entry_update_uname_utf8(struct archive_entry *, const char *);
/*
* Routines to bulk copy fields to/from a platform-native "struct
* stat." Libarchive used to just store a struct stat inside of each
* archive_entry object, but this created issues when trying to
* manipulate archives on systems different than the ones they were
* created on.
*
* TODO: On Linux, provide both stat32 and stat64 versions of these functions.
*/
__LA_DECL const struct stat *archive_entry_stat(struct archive_entry *);
__LA_DECL void archive_entry_copy_stat(struct archive_entry *, const struct stat *);
/*
* ACL routines. This used to simply store and return text-format ACL
* strings, but that proved insufficient for a number of reasons:
* = clients need control over uname/uid and gname/gid mappings
* = there are many different ACL text formats
* = would like to be able to read/convert archives containing ACLs
* on platforms that lack ACL libraries
*
* This last point, in particular, forces me to implement a reasonably
* complete set of ACL support routines.
*
* TODO: Extend this to support NFSv4/NTFS permissions. That should
* allow full ACL support on Mac OS, in particular, which uses
* POSIX.1e-style interfaces to manipulate NFSv4/NTFS permissions.
*/
/*
* Permission bits mimic POSIX.1e. Note that I've not followed POSIX.1e's
* "permset"/"perm" abstract type nonsense. A permset is just a simple
* bitmap, following long-standing Unix tradition.
*/
#define ARCHIVE_ENTRY_ACL_EXECUTE 1
#define ARCHIVE_ENTRY_ACL_WRITE 2
#define ARCHIVE_ENTRY_ACL_READ 4
/* We need to be able to specify either or both of these. */
#define ARCHIVE_ENTRY_ACL_TYPE_ACCESS 256
#define ARCHIVE_ENTRY_ACL_TYPE_DEFAULT 512
/* Tag values mimic POSIX.1e */
#define ARCHIVE_ENTRY_ACL_USER 10001 /* Specified user. */
#define ARCHIVE_ENTRY_ACL_USER_OBJ 10002 /* User who owns the file. */
#define ARCHIVE_ENTRY_ACL_GROUP 10003 /* Specified group. */
#define ARCHIVE_ENTRY_ACL_GROUP_OBJ 10004 /* Group who owns the file. */
#define ARCHIVE_ENTRY_ACL_MASK 10005 /* Modify group access. */
#define ARCHIVE_ENTRY_ACL_OTHER 10006 /* Public. */
/*
* Set the ACL by clearing it and adding entries one at a time.
* Unlike the POSIX.1e ACL routines, you must specify the type
* (access/default) for each entry. Internally, the ACL data is just
* a soup of entries. API calls here allow you to retrieve just the
* entries of interest. This design (which goes against the spirit of
* POSIX.1e) is useful for handling archive formats that combine
* default and access information in a single ACL list.
*/
__LA_DECL void archive_entry_acl_clear(struct archive_entry *);
__LA_DECL void archive_entry_acl_add_entry(struct archive_entry *,
int /* type */, int /* permset */, int /* tag */,
int /* qual */, const char * /* name */);
__LA_DECL void archive_entry_acl_add_entry_w(struct archive_entry *,
int /* type */, int /* permset */, int /* tag */,
int /* qual */, const wchar_t * /* name */);
/*
* To retrieve the ACL, first "reset", then repeatedly ask for the
* "next" entry. The want_type parameter allows you to request only
* access entries or only default entries.
*/
__LA_DECL int archive_entry_acl_reset(struct archive_entry *, int /* want_type */);
__LA_DECL int archive_entry_acl_next(struct archive_entry *, int /* want_type */,
int * /* type */, int * /* permset */, int * /* tag */,
int * /* qual */, const char ** /* name */);
__LA_DECL int archive_entry_acl_next_w(struct archive_entry *, int /* want_type */,
int * /* type */, int * /* permset */, int * /* tag */,
int * /* qual */, const wchar_t ** /* name */);
/*
* Construct a text-format ACL. The flags argument is a bitmask that
* can include any of the following:
*
* ARCHIVE_ENTRY_ACL_TYPE_ACCESS - Include access entries.
* ARCHIVE_ENTRY_ACL_TYPE_DEFAULT - Include default entries.
* ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID - Include extra numeric ID field in
* each ACL entry. (As used by 'star'.)
* ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT - Include "default:" before each
* default ACL entry.
*/
#define ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID 1024
#define ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT 2048
__LA_DECL const wchar_t *archive_entry_acl_text_w(struct archive_entry *,
int /* flags */);
/* Return a count of entries matching 'want_type' */
__LA_DECL int archive_entry_acl_count(struct archive_entry *, int /* want_type */);
/*
* Private ACL parser. This is private because it handles some
* very weird formats that clients should not be messing with.
* Clients should only deal with their platform-native formats.
* Because of the need to support many formats cleanly, new arguments
* are likely to get added on a regular basis. Clients who try to use
* this interface are likely to be surprised when it changes.
*
* You were warned!
*
* TODO: Move this declaration out of the public header and into
* a private header. Warnings above are silly.
*/
__LA_DECL int __archive_entry_acl_parse_w(struct archive_entry *,
const wchar_t *, int /* type */);
/*
* extended attributes
*/
__LA_DECL void archive_entry_xattr_clear(struct archive_entry *);
__LA_DECL void archive_entry_xattr_add_entry(struct archive_entry *,
const char * /* name */, const void * /* value */,
size_t /* size */);
/*
* To retrieve the xattr list, first "reset", then repeatedly ask for the
* "next" entry.
*/
__LA_DECL int archive_entry_xattr_count(struct archive_entry *);
__LA_DECL int archive_entry_xattr_reset(struct archive_entry *);
__LA_DECL int archive_entry_xattr_next(struct archive_entry *,
const char ** /* name */, const void ** /* value */, size_t *);
/*
* Utility to match up hardlinks.
*
* The 'struct archive_entry_linkresolver' is a cache of archive entries
* for files with multiple links. Here's how to use it:
* 1. Create a lookup object with archive_entry_linkresolver_new()
* 2. Tell it the archive format you're using.
* 3. Hand each archive_entry to archive_entry_linkify().
* That function will return 0, 1, or 2 entries that should
* be written.
* 4. Call archive_entry_linkify(resolver, NULL) until
* no more entries are returned.
* 5. Call archive_entry_link_resolver_free(resolver) to free resources.
*
* The entries returned have their hardlink and size fields updated
* appropriately. If an entry is passed in that does not refer to
* a file with multiple links, it is returned unchanged. The intention
* is that you should be able to simply filter all entries through
* this machine.
*
* To make things more efficient, be sure that each entry has a valid
* nlinks value. The hardlink cache uses this to track when all links
* have been found. If the nlinks value is zero, it will keep every
* name in the cache indefinitely, which can use a lot of memory.
*
* Note that archive_entry_size() is reset to zero if the file
* body should not be written to the archive. Pay attention!
*/
struct archive_entry_linkresolver;
/*
* There are three different strategies for marking hardlinks.
* The descriptions below name them after the best-known
* formats that rely on each strategy:
*
* "Old cpio" is the simplest, it always returns any entry unmodified.
* As far as I know, only cpio formats use this. Old cpio archives
* store every link with the full body; the onus is on the dearchiver
* to detect and properly link the files as they are restored.
* "tar" is also pretty simple; it caches a copy the first time it sees
* any link. Subsequent appearances are modified to be hardlink
* references to the first one without any body. Used by all tar
* formats, although the newest tar formats permit the "old cpio" strategy
* as well. This strategy is very simple for the dearchiver,
* and reasonably straightforward for the archiver.
* "new cpio" is trickier. It stores the body only with the last
* occurrence. The complication is that we might not
* see every link to a particular file in a single session, so
* there's no easy way to know when we've seen the last occurrence.
* The solution here is to queue one link until we see the next.
* At the end of the session, you can enumerate any remaining
* entries by calling archive_entry_linkify(NULL) and store those
* bodies. If you have a file with three links l1, l2, and l3,
* you'll get the following behavior if you see all three links:
* linkify(l1) => NULL (the resolver stores l1 internally)
* linkify(l2) => l1 (resolver stores l2, you write l1)
* linkify(l3) => l2, l3 (all links seen, you can write both).
* If you only see l1 and l2, you'll get this behavior:
* linkify(l1) => NULL
* linkify(l2) => l1
* linkify(NULL) => l2 (at end, you retrieve remaining links)
* As the name suggests, this strategy is used by newer cpio variants.
* It's noticably more complex for the archiver, slightly more complex
* for the dearchiver than the tar strategy, but makes it straightforward
* to restore a file using any link by simply continuing to scan until
* you see a link that is stored with a body. In contrast, the tar
* strategy requires you to rescan the archive from the beginning to
* correctly extract an arbitrary link.
*/
__LA_DECL struct archive_entry_linkresolver *archive_entry_linkresolver_new(void);
__LA_DECL void archive_entry_linkresolver_set_strategy(
struct archive_entry_linkresolver *, int /* format_code */);
__LA_DECL void archive_entry_linkresolver_free(struct archive_entry_linkresolver *);
__LA_DECL void archive_entry_linkify(struct archive_entry_linkresolver *,
struct archive_entry **, struct archive_entry **);
#ifdef __cplusplus
}
#endif
/* This is meaningless outside of this header. */
#undef __LA_DECL
#endif /* !ARCHIVE_ENTRY_H_INCLUDED */
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