524 lines
24 KiB
C
524 lines
24 KiB
C
/*-
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* Copyright (c) 2003-2008 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD: src/lib/libarchive/archive_entry.h,v 1.31 2008/12/06 06:18:46 kientzle Exp $
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*/
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#ifndef ARCHIVE_ENTRY_H_INCLUDED
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#define ARCHIVE_ENTRY_H_INCLUDED
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/*
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* Note: archive_entry.h is for use outside of libarchive; the
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* configuration headers (config.h, archive_platform.h, etc.) are
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* purely internal. Do NOT use HAVE_XXX configuration macros to
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* control the behavior of this header! If you must conditionalize,
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* use predefined compiler and/or platform macros.
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*/
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#include <sys/types.h>
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#include <stddef.h> /* for wchar_t */
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#include <time.h>
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#if defined(_WIN32) && !defined(__CYGWIN__)
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#include <windows.h>
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#endif
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/* Get appropriate definitions of standard POSIX-style types. */
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/* These should match the types used in 'struct stat' */
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#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__BORLANDC__)
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#define __LA_INT64_T __int64
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#define __LA_UID_T short
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#define __LA_GID_T short
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#define __LA_DEV_T unsigned int
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#define __LA_MODE_T unsigned short
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#else
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#ifdef __BORLANDC__
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# include <sys/types.h>
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#else
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# include <unistd.h>
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#endif
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#if defined(__BORLANDC__)
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#define __LA_INT64_T __int64
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#else
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#define __LA_INT64_T int64_t
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#endif
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#define __LA_UID_T uid_t
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#define __LA_GID_T gid_t
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#define __LA_DEV_T dev_t
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#define __LA_MODE_T mode_t
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#endif
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/*
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* XXX Is this defined for all Windows compilers? If so, in what
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* header? It would be nice to remove the __LA_INO_T indirection and
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* just use plain ino_t everywhere. Likewise for the other types just
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* above.
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*/
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#define __LA_INO_T ino_t
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/*
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* On Windows, define LIBARCHIVE_STATIC if you're building or using a
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* .lib. The default here assumes you're building a DLL. Only
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* libarchive source should ever define __LIBARCHIVE_BUILD.
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*/
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#if ((defined __WIN32__) || (defined _WIN32) || defined(__CYGWIN__)) && (!defined LIBARCHIVE_STATIC)
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# ifdef __LIBARCHIVE_BUILD
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# ifdef __GNUC__
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# define __LA_DECL __attribute__((dllexport)) extern
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# else
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# define __LA_DECL __declspec(dllexport)
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# endif
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# else
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# ifdef __GNUC__
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# define __LA_DECL __attribute__((dllimport)) extern
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# else
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# define __LA_DECL __declspec(dllimport)
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# endif
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# endif
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#else
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/* Static libraries on all platforms and shared libraries on non-Windows. */
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# define __LA_DECL
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Description of an archive entry.
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*
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* You can think of this as "struct stat" with some text fields added in.
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*
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* TODO: Add "comment", "charset", and possibly other entries that are
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* supported by "pax interchange" format. However, GNU, ustar, cpio,
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* and other variants don't support these features, so they're not an
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* excruciatingly high priority right now.
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*
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* TODO: "pax interchange" format allows essentially arbitrary
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* key/value attributes to be attached to any entry. Supporting
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* such extensions may make this library useful for special
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* applications (e.g., a package manager could attach special
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* package-management attributes to each entry).
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*/
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struct archive_entry;
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/*
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* File-type constants. These are returned from archive_entry_filetype()
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* and passed to archive_entry_set_filetype().
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*
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* These values match S_XXX defines on every platform I've checked,
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* including Windows, AIX, Linux, Solaris, and BSD. They're
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* (re)defined here because platforms generally don't define the ones
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* they don't support. For example, Windows doesn't define S_IFLNK or
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* S_IFBLK. Instead of having a mass of conditional logic and system
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* checks to define any S_XXX values that aren't supported locally,
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* I've just defined a new set of such constants so that
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* libarchive-based applications can manipulate and identify archive
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* entries properly even if the hosting platform can't store them on
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* disk.
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*
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* These values are also used directly within some portable formats,
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* such as cpio. If you find a platform that varies from these, the
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* correct solution is to leave these alone and translate from these
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* portable values to platform-native values when entries are read from
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* or written to disk.
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*/
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#define AE_IFMT 0170000
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#define AE_IFREG 0100000
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#define AE_IFLNK 0120000
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#define AE_IFSOCK 0140000
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#define AE_IFCHR 0020000
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#define AE_IFBLK 0060000
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#define AE_IFDIR 0040000
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#define AE_IFIFO 0010000
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/*
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* Basic object manipulation
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*/
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__LA_DECL struct archive_entry *archive_entry_clear(struct archive_entry *);
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/* The 'clone' function does a deep copy; all of the strings are copied too. */
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__LA_DECL struct archive_entry *archive_entry_clone(struct archive_entry *);
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__LA_DECL void archive_entry_free(struct archive_entry *);
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__LA_DECL struct archive_entry *archive_entry_new(void);
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/*
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* Retrieve fields from an archive_entry.
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*
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* There are a number of implicit conversions among these fields. For
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* example, if a regular string field is set and you read the _w wide
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* character field, the entry will implicitly convert narrow-to-wide
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* using the current locale. Similarly, dev values are automatically
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* updated when you write devmajor or devminor and vice versa.
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*
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* In addition, fields can be "set" or "unset." Unset string fields
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* return NULL, non-string fields have _is_set() functions to test
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* whether they've been set. You can "unset" a string field by
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* assigning NULL; non-string fields have _unset() functions to
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* unset them.
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*
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* Note: There is one ambiguity in the above; string fields will
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* also return NULL when implicit character set conversions fail.
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* This is usually what you want.
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*/
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__LA_DECL time_t archive_entry_atime(struct archive_entry *);
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__LA_DECL long archive_entry_atime_nsec(struct archive_entry *);
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__LA_DECL int archive_entry_atime_is_set(struct archive_entry *);
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__LA_DECL time_t archive_entry_birthtime(struct archive_entry *);
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__LA_DECL long archive_entry_birthtime_nsec(struct archive_entry *);
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__LA_DECL int archive_entry_birthtime_is_set(struct archive_entry *);
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__LA_DECL time_t archive_entry_ctime(struct archive_entry *);
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__LA_DECL long archive_entry_ctime_nsec(struct archive_entry *);
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__LA_DECL int archive_entry_ctime_is_set(struct archive_entry *);
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__LA_DECL dev_t archive_entry_dev(struct archive_entry *);
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__LA_DECL dev_t archive_entry_devmajor(struct archive_entry *);
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__LA_DECL dev_t archive_entry_devminor(struct archive_entry *);
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__LA_DECL __LA_MODE_T archive_entry_filetype(struct archive_entry *);
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__LA_DECL void archive_entry_fflags(struct archive_entry *,
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unsigned long * /* set */,
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unsigned long * /* clear */);
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__LA_DECL const char *archive_entry_fflags_text(struct archive_entry *);
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__LA_DECL __LA_GID_T archive_entry_gid(struct archive_entry *);
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__LA_DECL const char *archive_entry_gname(struct archive_entry *);
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__LA_DECL const wchar_t *archive_entry_gname_w(struct archive_entry *);
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__LA_DECL const char *archive_entry_hardlink(struct archive_entry *);
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__LA_DECL const wchar_t *archive_entry_hardlink_w(struct archive_entry *);
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__LA_DECL __LA_INO_T archive_entry_ino(struct archive_entry *);
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__LA_DECL __LA_INT64_T archive_entry_ino64(struct archive_entry *);
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__LA_DECL __LA_MODE_T archive_entry_mode(struct archive_entry *);
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__LA_DECL time_t archive_entry_mtime(struct archive_entry *);
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__LA_DECL long archive_entry_mtime_nsec(struct archive_entry *);
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__LA_DECL int archive_entry_mtime_is_set(struct archive_entry *);
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__LA_DECL unsigned int archive_entry_nlink(struct archive_entry *);
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__LA_DECL const char *archive_entry_pathname(struct archive_entry *);
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__LA_DECL const wchar_t *archive_entry_pathname_w(struct archive_entry *);
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__LA_DECL dev_t archive_entry_rdev(struct archive_entry *);
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__LA_DECL dev_t archive_entry_rdevmajor(struct archive_entry *);
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__LA_DECL dev_t archive_entry_rdevminor(struct archive_entry *);
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__LA_DECL const char *archive_entry_sourcepath(struct archive_entry *);
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__LA_DECL __LA_INT64_T archive_entry_size(struct archive_entry *);
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__LA_DECL int archive_entry_size_is_set(struct archive_entry *);
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__LA_DECL const char *archive_entry_strmode(struct archive_entry *);
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__LA_DECL const char *archive_entry_symlink(struct archive_entry *);
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__LA_DECL const wchar_t *archive_entry_symlink_w(struct archive_entry *);
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__LA_DECL __LA_UID_T archive_entry_uid(struct archive_entry *);
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__LA_DECL const char *archive_entry_uname(struct archive_entry *);
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__LA_DECL const wchar_t *archive_entry_uname_w(struct archive_entry *);
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/*
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* Set fields in an archive_entry.
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*
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* Note that string 'set' functions do not copy the string, only the pointer.
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* In contrast, 'copy' functions do copy the object pointed to.
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*
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* Note: As of libarchive 2.4, 'set' functions do copy the string and
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* are therefore exact synonyms for the 'copy' versions. The 'copy'
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* names will be retired in libarchive 3.0.
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*/
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__LA_DECL void archive_entry_set_atime(struct archive_entry *, time_t, long);
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__LA_DECL void archive_entry_unset_atime(struct archive_entry *);
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#if defined(_WIN32) && !defined(__CYGWIN__)
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__LA_DECL void archive_entry_copy_bhfi(struct archive_entry *,
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BY_HANDLE_FILE_INFORMATION *);
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#endif
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__LA_DECL void archive_entry_set_birthtime(struct archive_entry *, time_t, long);
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__LA_DECL void archive_entry_unset_birthtime(struct archive_entry *);
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__LA_DECL void archive_entry_set_ctime(struct archive_entry *, time_t, long);
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__LA_DECL void archive_entry_unset_ctime(struct archive_entry *);
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__LA_DECL void archive_entry_set_dev(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_devmajor(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_devminor(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_filetype(struct archive_entry *, unsigned int);
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__LA_DECL void archive_entry_set_fflags(struct archive_entry *,
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unsigned long /* set */, unsigned long /* clear */);
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/* Returns pointer to start of first invalid token, or NULL if none. */
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/* Note that all recognized tokens are processed, regardless. */
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__LA_DECL const char *archive_entry_copy_fflags_text(struct archive_entry *,
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const char *);
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__LA_DECL const wchar_t *archive_entry_copy_fflags_text_w(struct archive_entry *,
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const wchar_t *);
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__LA_DECL void archive_entry_set_gid(struct archive_entry *, __LA_GID_T);
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__LA_DECL void archive_entry_set_gname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_gname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_gname_w(struct archive_entry *, const wchar_t *);
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__LA_DECL int archive_entry_update_gname_utf8(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_set_hardlink(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_hardlink(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_hardlink_w(struct archive_entry *, const wchar_t *);
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#if ARCHIVE_VERSION_NUMBER >= 3000000
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/* Starting with libarchive 3.0, this will be synonym for ino64. */
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__LA_DECL void archive_entry_set_ino(struct archive_entry *, int64_t);
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#else
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__LA_DECL void archive_entry_set_ino(struct archive_entry *, unsigned long);
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#endif
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__LA_DECL void archive_entry_set_ino64(struct archive_entry *, __LA_INT64_T);
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__LA_DECL void archive_entry_set_link(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_link(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_link_w(struct archive_entry *, const wchar_t *);
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__LA_DECL int archive_entry_update_link_utf8(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_set_mode(struct archive_entry *, __LA_MODE_T);
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__LA_DECL void archive_entry_set_mtime(struct archive_entry *, time_t, long);
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__LA_DECL void archive_entry_unset_mtime(struct archive_entry *);
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__LA_DECL void archive_entry_set_nlink(struct archive_entry *, unsigned int);
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__LA_DECL void archive_entry_set_pathname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_pathname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_pathname_w(struct archive_entry *, const wchar_t *);
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__LA_DECL int archive_entry_update_pathname_utf8(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_set_perm(struct archive_entry *, __LA_MODE_T);
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__LA_DECL void archive_entry_set_rdev(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_rdevmajor(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_rdevminor(struct archive_entry *, dev_t);
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__LA_DECL void archive_entry_set_size(struct archive_entry *, __LA_INT64_T);
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__LA_DECL void archive_entry_unset_size(struct archive_entry *);
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__LA_DECL void archive_entry_copy_sourcepath(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_set_symlink(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_symlink(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_symlink_w(struct archive_entry *, const wchar_t *);
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__LA_DECL void archive_entry_set_uid(struct archive_entry *, __LA_UID_T);
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__LA_DECL void archive_entry_set_uname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_uname(struct archive_entry *, const char *);
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__LA_DECL void archive_entry_copy_uname_w(struct archive_entry *, const wchar_t *);
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__LA_DECL int archive_entry_update_uname_utf8(struct archive_entry *, const char *);
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/*
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* Routines to bulk copy fields to/from a platform-native "struct
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* stat." Libarchive used to just store a struct stat inside of each
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* archive_entry object, but this created issues when trying to
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* manipulate archives on systems different than the ones they were
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* created on.
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*
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* TODO: On Linux, provide both stat32 and stat64 versions of these functions.
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*/
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__LA_DECL const struct stat *archive_entry_stat(struct archive_entry *);
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__LA_DECL void archive_entry_copy_stat(struct archive_entry *, const struct stat *);
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/*
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* ACL routines. This used to simply store and return text-format ACL
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* strings, but that proved insufficient for a number of reasons:
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* = clients need control over uname/uid and gname/gid mappings
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* = there are many different ACL text formats
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* = would like to be able to read/convert archives containing ACLs
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* on platforms that lack ACL libraries
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*
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* This last point, in particular, forces me to implement a reasonably
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* complete set of ACL support routines.
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*
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* TODO: Extend this to support NFSv4/NTFS permissions. That should
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* allow full ACL support on Mac OS, in particular, which uses
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* POSIX.1e-style interfaces to manipulate NFSv4/NTFS permissions.
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*/
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/*
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* Permission bits mimic POSIX.1e. Note that I've not followed POSIX.1e's
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* "permset"/"perm" abstract type nonsense. A permset is just a simple
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* bitmap, following long-standing Unix tradition.
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*/
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#define ARCHIVE_ENTRY_ACL_EXECUTE 1
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#define ARCHIVE_ENTRY_ACL_WRITE 2
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#define ARCHIVE_ENTRY_ACL_READ 4
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/* We need to be able to specify either or both of these. */
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#define ARCHIVE_ENTRY_ACL_TYPE_ACCESS 256
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#define ARCHIVE_ENTRY_ACL_TYPE_DEFAULT 512
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/* Tag values mimic POSIX.1e */
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#define ARCHIVE_ENTRY_ACL_USER 10001 /* Specified user. */
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#define ARCHIVE_ENTRY_ACL_USER_OBJ 10002 /* User who owns the file. */
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#define ARCHIVE_ENTRY_ACL_GROUP 10003 /* Specified group. */
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#define ARCHIVE_ENTRY_ACL_GROUP_OBJ 10004 /* Group who owns the file. */
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#define ARCHIVE_ENTRY_ACL_MASK 10005 /* Modify group access. */
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#define ARCHIVE_ENTRY_ACL_OTHER 10006 /* Public. */
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/*
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* Set the ACL by clearing it and adding entries one at a time.
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* Unlike the POSIX.1e ACL routines, you must specify the type
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* (access/default) for each entry. Internally, the ACL data is just
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* a soup of entries. API calls here allow you to retrieve just the
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* entries of interest. This design (which goes against the spirit of
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* POSIX.1e) is useful for handling archive formats that combine
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* default and access information in a single ACL list.
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*/
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__LA_DECL void archive_entry_acl_clear(struct archive_entry *);
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__LA_DECL void archive_entry_acl_add_entry(struct archive_entry *,
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int /* type */, int /* permset */, int /* tag */,
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int /* qual */, const char * /* name */);
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__LA_DECL void archive_entry_acl_add_entry_w(struct archive_entry *,
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int /* type */, int /* permset */, int /* tag */,
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int /* qual */, const wchar_t * /* name */);
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/*
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* To retrieve the ACL, first "reset", then repeatedly ask for the
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* "next" entry. The want_type parameter allows you to request only
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* access entries or only default entries.
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*/
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__LA_DECL int archive_entry_acl_reset(struct archive_entry *, int /* want_type */);
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__LA_DECL int archive_entry_acl_next(struct archive_entry *, int /* want_type */,
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int * /* type */, int * /* permset */, int * /* tag */,
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int * /* qual */, const char ** /* name */);
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__LA_DECL int archive_entry_acl_next_w(struct archive_entry *, int /* want_type */,
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int * /* type */, int * /* permset */, int * /* tag */,
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int * /* qual */, const wchar_t ** /* name */);
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/*
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* Construct a text-format ACL. The flags argument is a bitmask that
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* can include any of the following:
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*
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* ARCHIVE_ENTRY_ACL_TYPE_ACCESS - Include access entries.
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* ARCHIVE_ENTRY_ACL_TYPE_DEFAULT - Include default entries.
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* ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID - Include extra numeric ID field in
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* each ACL entry. (As used by 'star'.)
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* ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT - Include "default:" before each
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* 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 */
|