3b54160eff
This generalizes the existing set/unset tracking for hardlink/symlink fields and extends it to cover non-string fields. Eventually, this will be further extended to cover most fields. In particular, this is needed to correctly detect when time fields are missing (for example, reading ustar archives doesn't set atime or ctime) for proper time restore and is helpful when trying to determine whether to overwrite data when restoring hardlinks. This commit updates the tests but not the docs.
178 lines
5.5 KiB
C
178 lines
5.5 KiB
C
/*-
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* Copyright (c) 2003-2007 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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* $FreeBSD$
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*/
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#ifndef ARCHIVE_ENTRY_PRIVATE_H_INCLUDED
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#define ARCHIVE_ENTRY_PRIVATE_H_INCLUDED
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#include "archive_string.h"
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/*
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* Handle wide character (i.e., Unicode) and non-wide character
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* strings transparently.
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*/
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struct aes {
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struct archive_string aes_mbs;
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struct archive_string aes_utf8;
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const wchar_t *aes_wcs;
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/* Bitmap of which of the above are valid. Because we're lazy
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* about malloc-ing and reusing the underlying storage, we
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* can't rely on NULL pointers to indicate whether a string
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* has been set. */
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int aes_set;
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#define AES_SET_MBS 1
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#define AES_SET_UTF8 2
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#define AES_SET_WCS 4
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};
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struct ae_acl {
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struct ae_acl *next;
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int type; /* E.g., access or default */
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int tag; /* E.g., user/group/other/mask */
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int permset; /* r/w/x bits */
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int id; /* uid/gid for user/group */
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struct aes name; /* uname/gname */
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};
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struct ae_xattr {
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struct ae_xattr *next;
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char *name;
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void *value;
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size_t size;
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};
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/*
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* Description of an archive entry.
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*
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* Basically, this is a "struct stat" with a few text fields added in.
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*
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* TODO: Add "comment", "charset", and possibly other entries
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* that are supported by "pax interchange" format. However, GNU, ustar,
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* cpio, 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). There are tricky
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* API issues involved, so this is not going to happen until
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* there's a real demand for it.
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*
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* TODO: Design a good API for handling sparse files.
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*/
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struct archive_entry {
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/*
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* Note that ae_stat.st_mode & AE_IFMT can be 0!
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*
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* This occurs when the actual file type of the object is not
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* in the archive. For example, 'tar' archives store
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* hardlinks without marking the type of the underlying
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* object.
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*/
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/*
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* Read archive_entry_copy_stat.c for an explanation of why I
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* don't just use "struct stat" instead of "struct aest" here
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* and why I have this odd pointer to a separately-allocated
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* struct stat.
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*/
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void *stat;
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int stat_valid; /* Set to 0 whenever a field in aest changes. */
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struct aest {
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int64_t aest_atime;
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uint32_t aest_atime_nsec;
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int64_t aest_ctime;
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uint32_t aest_ctime_nsec;
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int64_t aest_mtime;
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uint32_t aest_mtime_nsec;
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gid_t aest_gid;
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ino_t aest_ino;
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mode_t aest_mode;
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uint32_t aest_nlink;
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uint64_t aest_size;
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uid_t aest_uid;
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/*
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* Because converting between device codes and
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* major/minor values is platform-specific and
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* inherently a bit risky, we only do that conversion
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* lazily. That way, we will do a better job of
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* preserving information in those cases where no
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* conversion is actually required.
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*/
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int aest_dev_is_broken_down;
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dev_t aest_dev;
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dev_t aest_devmajor;
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dev_t aest_devminor;
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int aest_rdev_is_broken_down;
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dev_t aest_rdev;
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dev_t aest_rdevmajor;
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dev_t aest_rdevminor;
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} ae_stat;
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int ae_set; /* bitmap of fields that are currently set */
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#define AE_SET_HARDLINK 1
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#define AE_SET_SYMLINK 2
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#define AE_SET_ATIME 4
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#define AE_SET_CTIME 8
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#define AE_SET_MTIME 16
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#define AE_SET_SIZE 64
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/*
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* Use aes here so that we get transparent mbs<->wcs conversions.
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*/
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struct aes ae_fflags_text; /* Text fflags per fflagstostr(3) */
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unsigned long ae_fflags_set; /* Bitmap fflags */
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unsigned long ae_fflags_clear;
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struct aes ae_gname; /* Name of owning group */
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struct aes ae_hardlink; /* Name of target for hardlink */
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struct aes ae_pathname; /* Name of entry */
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struct aes ae_symlink; /* symlink contents */
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struct aes ae_uname; /* Name of owner */
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/* Not used within libarchive; useful for some clients. */
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struct aes ae_sourcepath; /* Path this entry is sourced from. */
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/* ACL support. */
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struct ae_acl *acl_head;
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struct ae_acl *acl_p;
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int acl_state; /* See acl_next for details. */
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wchar_t *acl_text_w;
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/* extattr support. */
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struct ae_xattr *xattr_head;
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struct ae_xattr *xattr_p;
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/* Miscellaneous. */
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char strmode[12];
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};
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#endif /* ARCHIVE_ENTRY_PRIVATE_H_INCLUDED */
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