/*-
 * 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.
 */

#include "archive_platform.h"
__FBSDID("$FreeBSD: src/lib/libarchive/archive_entry.c,v 1.55 2008/12/23 05:01:43 kientzle Exp $");

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#define HAVE_MAJOR
#elif MAJOR_IN_SYSMACROS
#include <sys/sysmacros.h>
#define HAVE_MAJOR
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_LINUX_FS_H
#include <linux/fs.h>   /* for Linux file flags */
#endif
/*
 * Some Linux distributions have both linux/ext2_fs.h and ext2fs/ext2_fs.h.
 * As the include guards don't agree, the order of include is important.
 */
#ifdef HAVE_LINUX_EXT2_FS_H
#include <linux/ext2_fs.h>  /* for Linux file flags */
#endif
#if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__)
#include <ext2fs/ext2_fs.h> /* for Linux file flags */
#endif
#include <stddef.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif

#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_entry_private.h"

#undef max
#define max(a, b)   ((a)>(b)?(a):(b))

#if !defined(HAVE_MAJOR) && !defined(major)
/* Replacement for major/minor/makedev. */
#define	major(x) ((int)(0x00ff & ((x) >> 8)))
#define	minor(x) ((int)(0xffff00ff & (x)))
#define	makedev(maj,min) ((0xff00 & ((maj)<<8)) | (0xffff00ff & (min)))
#endif

/* Play games to come up with a suitable makedev() definition. */
#ifdef __QNXNTO__
/* QNX.  <sigh> */
#include <sys/netmgr.h>
#define ae_makedev(maj, min) makedev(ND_LOCAL_NODE, (maj), (min))
#elif defined makedev
/* There's a "makedev" macro. */
#define ae_makedev(maj, min) makedev((maj), (min))
#elif defined mkdev || ((defined _WIN32 || defined __WIN32__) && !defined(__CYGWIN__))
/* Windows. <sigh> */
#define ae_makedev(maj, min) mkdev((maj), (min))
#else
/* There's a "makedev" function. */
#define ae_makedev(maj, min) makedev((maj), (min))
#endif

static void aes_clean(struct aes *);
static void aes_copy(struct aes *dest, struct aes *src);
static const char * aes_get_mbs(struct aes *);
static const wchar_t *  aes_get_wcs(struct aes *);
static int  aes_set_mbs(struct aes *, const char *mbs);
static int  aes_copy_mbs(struct aes *, const char *mbs);
/* static void  aes_set_wcs(struct aes *, const wchar_t *wcs); */
static int  aes_copy_wcs(struct aes *, const wchar_t *wcs);
static int  aes_copy_wcs_len(struct aes *, const wchar_t *wcs, size_t);

static char *    ae_fflagstostr(unsigned long bitset, unsigned long bitclear);
static const wchar_t    *ae_wcstofflags(const wchar_t *stringp,
            unsigned long *setp, unsigned long *clrp);
static const char   *ae_strtofflags(const char *stringp,
            unsigned long *setp, unsigned long *clrp);
static void append_entry_w(wchar_t **wp, const wchar_t *prefix, int tag,
            const wchar_t *wname, int perm, int id);
static void append_id_w(wchar_t **wp, int id);

static int  acl_special(struct archive_entry *entry,
            int type, int permset, int tag);
static struct ae_acl *acl_new_entry(struct archive_entry *entry,
            int type, int permset, int tag, int id);
static int  isint_w(const wchar_t *start, const wchar_t *end, int *result);
static int  ismode_w(const wchar_t *start, const wchar_t *end, int *result);
static void next_field_w(const wchar_t **wp, const wchar_t **start,
            const wchar_t **end, wchar_t *sep);
static int  prefix_w(const wchar_t *start, const wchar_t *end,
            const wchar_t *test);
static void
archive_entry_acl_add_entry_w_len(struct archive_entry *entry, int type,
            int permset, int tag, int id, const wchar_t *name, size_t);


#ifndef HAVE_WCSCPY
static wchar_t * wcscpy(wchar_t *s1, const wchar_t *s2)
{
    wchar_t *dest = s1;
    while ((*s1 = *s2) != L'\0')
        ++s1, ++s2;
    return dest;
}
#endif
#ifndef HAVE_WCSLEN
static size_t wcslen(const wchar_t *s)
{
    const wchar_t *p = s;
    while (*p != L'\0')
        ++p;
    return p - s;
}
#endif
#ifndef HAVE_WMEMCMP
/* Good enough for simple equality testing, but not for sorting. */
#define wmemcmp(a,b,i)  memcmp((a), (b), (i) * sizeof(wchar_t))
#endif
#ifndef HAVE_WMEMCPY
#define wmemcpy(a,b,i)  (wchar_t *)memcpy((a), (b), (i) * sizeof(wchar_t))
#endif

static void
aes_clean(struct aes *aes)
{
    if (aes->aes_wcs) {
        free((wchar_t *)(uintptr_t)aes->aes_wcs);
        aes->aes_wcs = NULL;
    }
    archive_string_free(&(aes->aes_mbs));
    archive_string_free(&(aes->aes_utf8));
    aes->aes_set = 0;
}

static void
aes_copy(struct aes *dest, struct aes *src)
{
    wchar_t *wp;

    dest->aes_set = src->aes_set;
    archive_string_copy(&(dest->aes_mbs), &(src->aes_mbs));
    archive_string_copy(&(dest->aes_utf8), &(src->aes_utf8));

    if (src->aes_wcs != NULL) {
        wp = (wchar_t *)malloc((wcslen(src->aes_wcs) + 1)
            * sizeof(wchar_t));
        if (wp == NULL)
            __archive_errx(1, "No memory for aes_copy()");
        wcscpy(wp, src->aes_wcs);
        dest->aes_wcs = wp;
    }
}

static const char *
aes_get_utf8(struct aes *aes)
{
    if (aes->aes_set & AES_SET_UTF8)
        return (aes->aes_utf8.s);
    if ((aes->aes_set & AES_SET_WCS)
        && archive_strappend_w_utf8(&(aes->aes_utf8), aes->aes_wcs) != NULL) {
        aes->aes_set |= AES_SET_UTF8;
        return (aes->aes_utf8.s);
    }
    return (NULL);
}

static const char *
aes_get_mbs(struct aes *aes)
{
    /* If we already have an MBS form, return that immediately. */
    if (aes->aes_set & AES_SET_MBS)
        return (aes->aes_mbs.s);
    /* If there's a WCS form, try converting with the native locale. */
    if ((aes->aes_set & AES_SET_WCS)
        && archive_strappend_w_mbs(&(aes->aes_mbs), aes->aes_wcs) != NULL) {
        aes->aes_set |= AES_SET_MBS;
        return (aes->aes_mbs.s);
    }
    /* We'll use UTF-8 for MBS if all else fails. */
    return (aes_get_utf8(aes));
}

static const wchar_t *
aes_get_wcs(struct aes *aes)
{
    wchar_t *w;
    int r;

    /* Return WCS form if we already have it. */
    if (aes->aes_set & AES_SET_WCS)
        return (aes->aes_wcs);

    if (aes->aes_set & AES_SET_MBS) {
        /* Try converting MBS to WCS using native locale. */
        /*
         * No single byte will be more than one wide character,
         * so this length estimate will always be big enough.
         */
        size_t wcs_length = aes->aes_mbs.length;

        w = (wchar_t *)malloc((wcs_length + 1) * sizeof(wchar_t));
        if (w == NULL)
            __archive_errx(1, "No memory for aes_get_wcs()");
        r = mbstowcs(w, aes->aes_mbs.s, wcs_length);
        if (r > 0) {
            w[r] = 0;
            aes->aes_set |= AES_SET_WCS;
            return (aes->aes_wcs = w);
        }
        free(w);
    }

    if (aes->aes_set & AES_SET_UTF8) {
        /* Try converting UTF8 to WCS. */
        aes->aes_wcs = __archive_string_utf8_w(&(aes->aes_utf8));
        if (aes->aes_wcs != NULL)
            aes->aes_set |= AES_SET_WCS;
        return (aes->aes_wcs);
    }
    return (NULL);
}

static int
aes_set_mbs(struct aes *aes, const char *mbs)
{
    return (aes_copy_mbs(aes, mbs));
}

static int
aes_copy_mbs(struct aes *aes, const char *mbs)
{
    if (mbs == NULL) {
        aes->aes_set = 0;
        return (0);
    }
    aes->aes_set = AES_SET_MBS; /* Only MBS form is set now. */
    archive_strcpy(&(aes->aes_mbs), mbs);
    archive_string_empty(&(aes->aes_utf8));
    if (aes->aes_wcs) {
        free((wchar_t *)(uintptr_t)aes->aes_wcs);
        aes->aes_wcs = NULL;
    }
    return (0);
}

/*
 * The 'update' form tries to proactively update all forms of
 * this string (WCS and MBS) and returns an error if any of
 * them fail.  This is used by the 'pax' handler, for instance,
 * to detect and report character-conversion failures early while
 * still allowing clients to get potentially useful values from
 * the more tolerant lazy conversions.  (get_mbs and get_wcs will
 * strive to give the user something useful, so you can get hopefully
 * usable values even if some of the character conversions are failing.)
 */
static int
aes_update_utf8(struct aes *aes, const char *utf8)
{
    if (utf8 == NULL) {
        aes->aes_set = 0;
        return (1); /* Succeeded in clearing everything. */
    }

    /* Save the UTF8 string. */
    archive_strcpy(&(aes->aes_utf8), utf8);

    /* Empty the mbs and wcs strings. */
    archive_string_empty(&(aes->aes_mbs));
    if (aes->aes_wcs) {
        free((wchar_t *)(uintptr_t)aes->aes_wcs);
        aes->aes_wcs = NULL;
    }

    aes->aes_set = AES_SET_UTF8;    /* Only UTF8 is set now. */

    /* TODO: We should just do a direct UTF-8 to MBS conversion
     * here.  That would be faster, use less space, and give the
     * same information.  (If a UTF-8 to MBS conversion succeeds,
     * then UTF-8->WCS and Unicode->MBS conversions will both
     * succeed.) */

    /* Try converting UTF8 to WCS, return false on failure. */
    aes->aes_wcs = __archive_string_utf8_w(&(aes->aes_utf8));
    if (aes->aes_wcs == NULL)
        return (0);
    aes->aes_set = AES_SET_UTF8 | AES_SET_WCS; /* Both UTF8 and WCS set. */

    /* Try converting WCS to MBS, return false on failure. */
    if (archive_strappend_w_mbs(&(aes->aes_mbs), aes->aes_wcs) == NULL)
        return (0);
    aes->aes_set = AES_SET_UTF8 | AES_SET_WCS | AES_SET_MBS;

    /* All conversions succeeded. */
    return (1);
}

static int
aes_copy_wcs(struct aes *aes, const wchar_t *wcs)
{
    return aes_copy_wcs_len(aes, wcs, wcs == NULL ? 0 : wcslen(wcs));
}

static int
aes_copy_wcs_len(struct aes *aes, const wchar_t *wcs, size_t len)
{
    wchar_t *w;

    if (wcs == NULL) {
        aes->aes_set = 0;
        return (0);
    }
    aes->aes_set = AES_SET_WCS; /* Only WCS form set. */
    archive_string_empty(&(aes->aes_mbs));
    archive_string_empty(&(aes->aes_utf8));
    if (aes->aes_wcs) {
        free((wchar_t *)(uintptr_t)aes->aes_wcs);
        aes->aes_wcs = NULL;
    }
    w = (wchar_t *)malloc((len + 1) * sizeof(wchar_t));
    if (w == NULL)
        __archive_errx(1, "No memory for aes_copy_wcs()");
    wmemcpy(w, wcs, len);
    w[len] = L'\0';
    aes->aes_wcs = w;
    return (0);
}

/****************************************************************************
 *
 * Public Interface
 *
 ****************************************************************************/

struct archive_entry *
archive_entry_clear(struct archive_entry *entry)
{
    if (entry == NULL)
        return (NULL);
    aes_clean(&entry->ae_fflags_text);
    aes_clean(&entry->ae_gname);
    aes_clean(&entry->ae_hardlink);
    aes_clean(&entry->ae_pathname);
    aes_clean(&entry->ae_sourcepath);
    aes_clean(&entry->ae_symlink);
    aes_clean(&entry->ae_uname);
    archive_entry_acl_clear(entry);
    archive_entry_xattr_clear(entry);
    free(entry->stat);
    memset(entry, 0, sizeof(*entry));
    return entry;
}

struct archive_entry *
archive_entry_clone(struct archive_entry *entry)
{
    struct archive_entry *entry2;
    struct ae_acl *ap, *ap2;
    struct ae_xattr *xp;

    /* Allocate new structure and copy over all of the fields. */
    entry2 = (struct archive_entry *)malloc(sizeof(*entry2));
    if (entry2 == NULL)
        return (NULL);
    memset(entry2, 0, sizeof(*entry2));
    entry2->ae_stat = entry->ae_stat;
    entry2->ae_fflags_set = entry->ae_fflags_set;
    entry2->ae_fflags_clear = entry->ae_fflags_clear;

    aes_copy(&entry2->ae_fflags_text, &entry->ae_fflags_text);
    aes_copy(&entry2->ae_gname, &entry->ae_gname);
    aes_copy(&entry2->ae_hardlink, &entry->ae_hardlink);
    aes_copy(&entry2->ae_pathname, &entry->ae_pathname);
    aes_copy(&entry2->ae_sourcepath, &entry->ae_sourcepath);
    aes_copy(&entry2->ae_symlink, &entry->ae_symlink);
    entry2->ae_set = entry->ae_set;
    aes_copy(&entry2->ae_uname, &entry->ae_uname);

    /* Copy ACL data over. */
    ap = entry->acl_head;
    while (ap != NULL) {
        ap2 = acl_new_entry(entry2,
            ap->type, ap->permset, ap->tag, ap->id);
        if (ap2 != NULL)
            aes_copy(&ap2->name, &ap->name);
        ap = ap->next;
    }

    /* Copy xattr data over. */
    xp = entry->xattr_head;
    while (xp != NULL) {
        archive_entry_xattr_add_entry(entry2,
            xp->name, xp->value, xp->size);
        xp = xp->next;
    }

    return (entry2);
}

void
archive_entry_free(struct archive_entry *entry)
{
    archive_entry_clear(entry);
    free(entry);
}

struct archive_entry *
archive_entry_new(void)
{
    struct archive_entry *entry;

    entry = (struct archive_entry *)malloc(sizeof(*entry));
    if (entry == NULL)
        return (NULL);
    memset(entry, 0, sizeof(*entry));
    return (entry);
}

/*
 * Functions for reading fields from an archive_entry.
 */

time_t
archive_entry_atime(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_atime);
}

long
archive_entry_atime_nsec(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_atime_nsec);
}

int
archive_entry_atime_is_set(struct archive_entry *entry)
{
    return (entry->ae_set & AE_SET_ATIME);
}

time_t
archive_entry_birthtime(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_birthtime);
}

long
archive_entry_birthtime_nsec(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_birthtime_nsec);
}

int
archive_entry_birthtime_is_set(struct archive_entry *entry)
{
    return (entry->ae_set & AE_SET_BIRTHTIME);
}

time_t
archive_entry_ctime(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_ctime);
}

int
archive_entry_ctime_is_set(struct archive_entry *entry)
{
    return (entry->ae_set & AE_SET_CTIME);
}

long
archive_entry_ctime_nsec(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_ctime_nsec);
}

dev_t
archive_entry_dev(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_dev_is_broken_down)
        return ae_makedev(entry->ae_stat.aest_devmajor,
            entry->ae_stat.aest_devminor);
    else
        return (entry->ae_stat.aest_dev);
}

dev_t
archive_entry_devmajor(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_dev_is_broken_down)
        return (entry->ae_stat.aest_devmajor);
    else
        return major(entry->ae_stat.aest_dev);
}

dev_t
archive_entry_devminor(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_dev_is_broken_down)
        return (entry->ae_stat.aest_devminor);
    else
        return minor(entry->ae_stat.aest_dev);
}

mode_t
archive_entry_filetype(struct archive_entry *entry)
{
    return (AE_IFMT & entry->ae_stat.aest_mode);
}

void
archive_entry_fflags(struct archive_entry *entry,
    unsigned long *set, unsigned long *clear)
{
    *set = entry->ae_fflags_set;
    *clear = entry->ae_fflags_clear;
}

/*
 * Note: if text was provided, this just returns that text.  If you
 * really need the text to be rebuilt in a canonical form, set the
 * text, ask for the bitmaps, then set the bitmaps.  (Setting the
 * bitmaps clears any stored text.)  This design is deliberate: if
 * we're editing archives, we don't want to discard flags just because
 * they aren't supported on the current system.  The bitmap<->text
 * conversions are platform-specific (see below).
 */
const char *
archive_entry_fflags_text(struct archive_entry *entry)
{
    const char *f;
    char *p;

    f = aes_get_mbs(&entry->ae_fflags_text);
    if (f != NULL)
        return (f);

    if (entry->ae_fflags_set == 0  &&  entry->ae_fflags_clear == 0)
        return (NULL);

    p = ae_fflagstostr(entry->ae_fflags_set, entry->ae_fflags_clear);
    if (p == NULL)
        return (NULL);

    aes_copy_mbs(&entry->ae_fflags_text, p);
    free(p);
    f = aes_get_mbs(&entry->ae_fflags_text);
    return (f);
}

gid_t
archive_entry_gid(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_gid);
}

const char *
archive_entry_gname(struct archive_entry *entry)
{
    return (aes_get_mbs(&entry->ae_gname));
}

const wchar_t *
archive_entry_gname_w(struct archive_entry *entry)
{
    return (aes_get_wcs(&entry->ae_gname));
}

const char *
archive_entry_hardlink(struct archive_entry *entry)
{
    if (entry->ae_set & AE_SET_HARDLINK)
        return (aes_get_mbs(&entry->ae_hardlink));
    return (NULL);
}

const wchar_t *
archive_entry_hardlink_w(struct archive_entry *entry)
{
    if (entry->ae_set & AE_SET_HARDLINK)
        return (aes_get_wcs(&entry->ae_hardlink));
    return (NULL);
}

ino_t
archive_entry_ino(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_ino);
}

int64_t
archive_entry_ino64(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_ino);
}

mode_t
archive_entry_mode(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_mode);
}

time_t
archive_entry_mtime(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_mtime);
}

long
archive_entry_mtime_nsec(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_mtime_nsec);
}

int
archive_entry_mtime_is_set(struct archive_entry *entry)
{
    return (entry->ae_set & AE_SET_MTIME);
}

unsigned int
archive_entry_nlink(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_nlink);
}

const char *
archive_entry_pathname(struct archive_entry *entry)
{
    return (aes_get_mbs(&entry->ae_pathname));
}

const wchar_t *
archive_entry_pathname_w(struct archive_entry *entry)
{
    return (aes_get_wcs(&entry->ae_pathname));
}

dev_t
archive_entry_rdev(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_rdev_is_broken_down)
        return ae_makedev(entry->ae_stat.aest_rdevmajor,
            entry->ae_stat.aest_rdevminor);
    else
        return (entry->ae_stat.aest_rdev);
}

dev_t
archive_entry_rdevmajor(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_rdev_is_broken_down)
        return (entry->ae_stat.aest_rdevmajor);
    else
        return major(entry->ae_stat.aest_rdev);
}

dev_t
archive_entry_rdevminor(struct archive_entry *entry)
{
    if (entry->ae_stat.aest_rdev_is_broken_down)
        return (entry->ae_stat.aest_rdevminor);
    else
        return minor(entry->ae_stat.aest_rdev);
}

int64_t
archive_entry_size(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_size);
}

int
archive_entry_size_is_set(struct archive_entry *entry)
{
    return (entry->ae_set & AE_SET_SIZE);
}

const char *
archive_entry_sourcepath(struct archive_entry *entry)
{
    return (aes_get_mbs(&entry->ae_sourcepath));
}

const char *
archive_entry_symlink(struct archive_entry *entry)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        return (aes_get_mbs(&entry->ae_symlink));
    return (NULL);
}

const wchar_t *
archive_entry_symlink_w(struct archive_entry *entry)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        return (aes_get_wcs(&entry->ae_symlink));
    return (NULL);
}

uid_t
archive_entry_uid(struct archive_entry *entry)
{
    return (entry->ae_stat.aest_uid);
}

const char *
archive_entry_uname(struct archive_entry *entry)
{
    return (aes_get_mbs(&entry->ae_uname));
}

const wchar_t *
archive_entry_uname_w(struct archive_entry *entry)
{
    return (aes_get_wcs(&entry->ae_uname));
}

/*
 * Functions to set archive_entry properties.
 */

void
archive_entry_set_filetype(struct archive_entry *entry, unsigned int type)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_mode &= ~AE_IFMT;
    entry->ae_stat.aest_mode |= AE_IFMT & type;
}

void
archive_entry_set_fflags(struct archive_entry *entry,
    unsigned long set, unsigned long clear)
{
    aes_clean(&entry->ae_fflags_text);
    entry->ae_fflags_set = set;
    entry->ae_fflags_clear = clear;
}

const char *
archive_entry_copy_fflags_text(struct archive_entry *entry,
    const char *flags)
{
    aes_copy_mbs(&entry->ae_fflags_text, flags);
    return (ae_strtofflags(flags,
            &entry->ae_fflags_set, &entry->ae_fflags_clear));
}

const wchar_t *
archive_entry_copy_fflags_text_w(struct archive_entry *entry,
    const wchar_t *flags)
{
    aes_copy_wcs(&entry->ae_fflags_text, flags);
    return (ae_wcstofflags(flags,
            &entry->ae_fflags_set, &entry->ae_fflags_clear));
}

void
archive_entry_set_gid(struct archive_entry *entry, gid_t g)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_gid = g;
}

void
archive_entry_set_gname(struct archive_entry *entry, const char *name)
{
    aes_set_mbs(&entry->ae_gname, name);
}

void
archive_entry_copy_gname(struct archive_entry *entry, const char *name)
{
    aes_copy_mbs(&entry->ae_gname, name);
}

void
archive_entry_copy_gname_w(struct archive_entry *entry, const wchar_t *name)
{
    aes_copy_wcs(&entry->ae_gname, name);
}

int
archive_entry_update_gname_utf8(struct archive_entry *entry, const char *name)
{
    return (aes_update_utf8(&entry->ae_gname, name));
}

void
archive_entry_set_ino(struct archive_entry *entry, unsigned long ino)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_ino = ino;
}

void
archive_entry_set_ino64(struct archive_entry *entry, int64_t ino)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_ino = ino;
}

void
archive_entry_set_hardlink(struct archive_entry *entry, const char *target)
{
    aes_set_mbs(&entry->ae_hardlink, target);
    if (target != NULL)
        entry->ae_set |= AE_SET_HARDLINK;
    else
        entry->ae_set &= ~AE_SET_HARDLINK;
}

void
archive_entry_copy_hardlink(struct archive_entry *entry, const char *target)
{
    aes_copy_mbs(&entry->ae_hardlink, target);
    if (target != NULL)
        entry->ae_set |= AE_SET_HARDLINK;
    else
        entry->ae_set &= ~AE_SET_HARDLINK;
}

void
archive_entry_copy_hardlink_w(struct archive_entry *entry, const wchar_t *target)
{
    aes_copy_wcs(&entry->ae_hardlink, target);
    if (target != NULL)
        entry->ae_set |= AE_SET_HARDLINK;
    else
        entry->ae_set &= ~AE_SET_HARDLINK;
}

void
archive_entry_set_atime(struct archive_entry *entry, time_t t, long ns)
{
    entry->stat_valid = 0;
    entry->ae_set |= AE_SET_ATIME;
    entry->ae_stat.aest_atime = t;
    entry->ae_stat.aest_atime_nsec = ns;
}

void
archive_entry_unset_atime(struct archive_entry *entry)
{
    archive_entry_set_atime(entry, 0, 0);
    entry->ae_set &= ~AE_SET_ATIME;
}

void
archive_entry_set_birthtime(struct archive_entry *entry, time_t m, long ns)
{
    entry->stat_valid = 0;
    entry->ae_set |= AE_SET_BIRTHTIME;
    entry->ae_stat.aest_birthtime = m;
    entry->ae_stat.aest_birthtime_nsec = ns;
}

void
archive_entry_unset_birthtime(struct archive_entry *entry)
{
    archive_entry_set_birthtime(entry, 0, 0);
    entry->ae_set &= ~AE_SET_BIRTHTIME;
}

void
archive_entry_set_ctime(struct archive_entry *entry, time_t t, long ns)
{
    entry->stat_valid = 0;
    entry->ae_set |= AE_SET_CTIME;
    entry->ae_stat.aest_ctime = t;
    entry->ae_stat.aest_ctime_nsec = ns;
}

void
archive_entry_unset_ctime(struct archive_entry *entry)
{
    archive_entry_set_ctime(entry, 0, 0);
    entry->ae_set &= ~AE_SET_CTIME;
}

void
archive_entry_set_dev(struct archive_entry *entry, dev_t d)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_dev_is_broken_down = 0;
    entry->ae_stat.aest_dev = d;
}

void
archive_entry_set_devmajor(struct archive_entry *entry, dev_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_dev_is_broken_down = 1;
    entry->ae_stat.aest_devmajor = m;
}

void
archive_entry_set_devminor(struct archive_entry *entry, dev_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_dev_is_broken_down = 1;
    entry->ae_stat.aest_devminor = m;
}

/* Set symlink if symlink is already set, else set hardlink. */
void
archive_entry_set_link(struct archive_entry *entry, const char *target)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        aes_set_mbs(&entry->ae_symlink, target);
    else
        aes_set_mbs(&entry->ae_hardlink, target);
}

/* Set symlink if symlink is already set, else set hardlink. */
void
archive_entry_copy_link(struct archive_entry *entry, const char *target)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        aes_copy_mbs(&entry->ae_symlink, target);
    else
        aes_copy_mbs(&entry->ae_hardlink, target);
}

/* Set symlink if symlink is already set, else set hardlink. */
void
archive_entry_copy_link_w(struct archive_entry *entry, const wchar_t *target)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        aes_copy_wcs(&entry->ae_symlink, target);
    else
        aes_copy_wcs(&entry->ae_hardlink, target);
}

int
archive_entry_update_link_utf8(struct archive_entry *entry, const char *target)
{
    if (entry->ae_set & AE_SET_SYMLINK)
        return (aes_update_utf8(&entry->ae_symlink, target));
    else
        return (aes_update_utf8(&entry->ae_hardlink, target));
}

void
archive_entry_set_mode(struct archive_entry *entry, mode_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_mode = m;
}

void
archive_entry_set_mtime(struct archive_entry *entry, time_t m, long ns)
{
    entry->stat_valid = 0;
    entry->ae_set |= AE_SET_MTIME;
    entry->ae_stat.aest_mtime = m;
    entry->ae_stat.aest_mtime_nsec = ns;
}

void
archive_entry_unset_mtime(struct archive_entry *entry)
{
    archive_entry_set_mtime(entry, 0, 0);
    entry->ae_set &= ~AE_SET_MTIME;
}

void
archive_entry_set_nlink(struct archive_entry *entry, unsigned int nlink)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_nlink = nlink;
}

void
archive_entry_set_pathname(struct archive_entry *entry, const char *name)
{
    aes_set_mbs(&entry->ae_pathname, name);
}

void
archive_entry_copy_pathname(struct archive_entry *entry, const char *name)
{
    aes_copy_mbs(&entry->ae_pathname, name);
}

void
archive_entry_copy_pathname_w(struct archive_entry *entry, const wchar_t *name)
{
    aes_copy_wcs(&entry->ae_pathname, name);
}

int
archive_entry_update_pathname_utf8(struct archive_entry *entry, const char *name)
{
    return (aes_update_utf8(&entry->ae_pathname, name));
}

void
archive_entry_set_perm(struct archive_entry *entry, mode_t p)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_mode &= AE_IFMT;
    entry->ae_stat.aest_mode |= ~AE_IFMT & p;
}

void
archive_entry_set_rdev(struct archive_entry *entry, dev_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_rdev = m;
    entry->ae_stat.aest_rdev_is_broken_down = 0;
}

void
archive_entry_set_rdevmajor(struct archive_entry *entry, dev_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_rdev_is_broken_down = 1;
    entry->ae_stat.aest_rdevmajor = m;
}

void
archive_entry_set_rdevminor(struct archive_entry *entry, dev_t m)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_rdev_is_broken_down = 1;
    entry->ae_stat.aest_rdevminor = m;
}

void
archive_entry_set_size(struct archive_entry *entry, int64_t s)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_size = s;
    entry->ae_set |= AE_SET_SIZE;
}

void
archive_entry_unset_size(struct archive_entry *entry)
{
    archive_entry_set_size(entry, 0);
    entry->ae_set &= ~AE_SET_SIZE;
}

void
archive_entry_copy_sourcepath(struct archive_entry *entry, const char *path)
{
    aes_set_mbs(&entry->ae_sourcepath, path);
}

void
archive_entry_set_symlink(struct archive_entry *entry, const char *linkname)
{
    aes_set_mbs(&entry->ae_symlink, linkname);
    if (linkname != NULL)
        entry->ae_set |= AE_SET_SYMLINK;
    else
        entry->ae_set &= ~AE_SET_SYMLINK;
}

void
archive_entry_copy_symlink(struct archive_entry *entry, const char *linkname)
{
    aes_copy_mbs(&entry->ae_symlink, linkname);
    if (linkname != NULL)
        entry->ae_set |= AE_SET_SYMLINK;
    else
        entry->ae_set &= ~AE_SET_SYMLINK;
}

void
archive_entry_copy_symlink_w(struct archive_entry *entry, const wchar_t *linkname)
{
    aes_copy_wcs(&entry->ae_symlink, linkname);
    if (linkname != NULL)
        entry->ae_set |= AE_SET_SYMLINK;
    else
        entry->ae_set &= ~AE_SET_SYMLINK;
}

void
archive_entry_set_uid(struct archive_entry *entry, uid_t u)
{
    entry->stat_valid = 0;
    entry->ae_stat.aest_uid = u;
}

void
archive_entry_set_uname(struct archive_entry *entry, const char *name)
{
    aes_set_mbs(&entry->ae_uname, name);
}

void
archive_entry_copy_uname(struct archive_entry *entry, const char *name)
{
    aes_copy_mbs(&entry->ae_uname, name);
}

void
archive_entry_copy_uname_w(struct archive_entry *entry, const wchar_t *name)
{
    aes_copy_wcs(&entry->ae_uname, name);
}

int
archive_entry_update_uname_utf8(struct archive_entry *entry, const char *name)
{
    return (aes_update_utf8(&entry->ae_uname, name));
}

/*
 * ACL management.  The following would, of course, be a lot simpler
 * if: 1) the last draft of POSIX.1e were a really thorough and
 * complete standard that addressed the needs of ACL archiving and 2)
 * everyone followed it faithfully.  Alas, neither is true, so the
 * following is a lot more complex than might seem necessary to the
 * uninitiated.
 */

void
archive_entry_acl_clear(struct archive_entry *entry)
{
    struct ae_acl   *ap;

    while (entry->acl_head != NULL) {
        ap = entry->acl_head->next;
        aes_clean(&entry->acl_head->name);
        free(entry->acl_head);
        entry->acl_head = ap;
    }
    if (entry->acl_text_w != NULL) {
        free(entry->acl_text_w);
        entry->acl_text_w = NULL;
    }
    entry->acl_p = NULL;
    entry->acl_state = 0; /* Not counting. */
}

/*
 * Add a single ACL entry to the internal list of ACL data.
 */
void
archive_entry_acl_add_entry(struct archive_entry *entry,
    int type, int permset, int tag, int id, const char *name)
{
    struct ae_acl *ap;

    if (acl_special(entry, type, permset, tag) == 0)
        return;
    ap = acl_new_entry(entry, type, permset, tag, id);
    if (ap == NULL) {
        /* XXX Error XXX */
        return;
    }
    if (name != NULL  &&  *name != '\0')
        aes_copy_mbs(&ap->name, name);
    else
        aes_clean(&ap->name);
}

/*
 * As above, but with a wide-character name.
 */
void
archive_entry_acl_add_entry_w(struct archive_entry *entry,
    int type, int permset, int tag, int id, const wchar_t *name)
{
    archive_entry_acl_add_entry_w_len(entry, type, permset, tag, id, name, wcslen(name));
}

static void
archive_entry_acl_add_entry_w_len(struct archive_entry *entry,
    int type, int permset, int tag, int id, const wchar_t *name, size_t len)
{
    struct ae_acl *ap;

    if (acl_special(entry, type, permset, tag) == 0)
        return;
    ap = acl_new_entry(entry, type, permset, tag, id);
    if (ap == NULL) {
        /* XXX Error XXX */
        return;
    }
    if (name != NULL  &&  *name != L'\0' && len > 0)
        aes_copy_wcs_len(&ap->name, name, len);
    else
        aes_clean(&ap->name);
}

/*
 * If this ACL entry is part of the standard POSIX permissions set,
 * store the permissions in the stat structure and return zero.
 */
static int
acl_special(struct archive_entry *entry, int type, int permset, int tag)
{
    if (type == ARCHIVE_ENTRY_ACL_TYPE_ACCESS) {
        switch (tag) {
        case ARCHIVE_ENTRY_ACL_USER_OBJ:
            entry->ae_stat.aest_mode &= ~0700;
            entry->ae_stat.aest_mode |= (permset & 7) << 6;
            return (0);
        case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
            entry->ae_stat.aest_mode &= ~0070;
            entry->ae_stat.aest_mode |= (permset & 7) << 3;
            return (0);
        case ARCHIVE_ENTRY_ACL_OTHER:
            entry->ae_stat.aest_mode &= ~0007;
            entry->ae_stat.aest_mode |= permset & 7;
            return (0);
        }
    }
    return (1);
}

/*
 * Allocate and populate a new ACL entry with everything but the
 * name.
 */
static struct ae_acl *
acl_new_entry(struct archive_entry *entry,
    int type, int permset, int tag, int id)
{
    struct ae_acl *ap, *aq;

    if (type != ARCHIVE_ENTRY_ACL_TYPE_ACCESS &&
        type != ARCHIVE_ENTRY_ACL_TYPE_DEFAULT)
        return (NULL);
    if (entry->acl_text_w != NULL) {
        free(entry->acl_text_w);
        entry->acl_text_w = NULL;
    }

    /* XXX TODO: More sanity-checks on the arguments XXX */

    /* If there's a matching entry already in the list, overwrite it. */
    ap = entry->acl_head;
    aq = NULL;
    while (ap != NULL) {
        if (ap->type == type && ap->tag == tag && ap->id == id) {
            ap->permset = permset;
            return (ap);
        }
        aq = ap;
        ap = ap->next;
    }

    /* Add a new entry to the end of the list. */
    ap = (struct ae_acl *)malloc(sizeof(*ap));
    if (ap == NULL)
        return (NULL);
    memset(ap, 0, sizeof(*ap));
    if (aq == NULL)
        entry->acl_head = ap;
    else
        aq->next = ap;
    ap->type = type;
    ap->tag = tag;
    ap->id = id;
    ap->permset = permset;
    return (ap);
}

/*
 * Return a count of entries matching "want_type".
 */
int
archive_entry_acl_count(struct archive_entry *entry, int want_type)
{
    int count;
    struct ae_acl *ap;

    count = 0;
    ap = entry->acl_head;
    while (ap != NULL) {
        if ((ap->type & want_type) != 0)
            count++;
        ap = ap->next;
    }

    if (count > 0 && ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0))
        count += 3;
    return (count);
}

/*
 * Prepare for reading entries from the ACL data.  Returns a count
 * of entries matching "want_type", or zero if there are no
 * non-extended ACL entries of that type.
 */
int
archive_entry_acl_reset(struct archive_entry *entry, int want_type)
{
    int count, cutoff;

    count = archive_entry_acl_count(entry, want_type);

    /*
     * If the only entries are the three standard ones,
     * then don't return any ACL data.  (In this case,
     * client can just use chmod(2) to set permissions.)
     */
    if ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0)
        cutoff = 3;
    else
        cutoff = 0;

    if (count > cutoff)
        entry->acl_state = ARCHIVE_ENTRY_ACL_USER_OBJ;
    else
        entry->acl_state = 0;
    entry->acl_p = entry->acl_head;
    return (count);
}

/*
 * Return the next ACL entry in the list.  Fake entries for the
 * standard permissions and include them in the returned list.
 */

int
archive_entry_acl_next(struct archive_entry *entry, int want_type, int *type,
    int *permset, int *tag, int *id, const char **name)
{
    *name = NULL;
    *id = -1;

    /*
     * The acl_state is either zero (no entries available), -1
     * (reading from list), or an entry type (retrieve that type
     * from ae_stat.aest_mode).
     */
    if (entry->acl_state == 0)
        return (ARCHIVE_WARN);

    /* The first three access entries are special. */
    if ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
        switch (entry->acl_state) {
        case ARCHIVE_ENTRY_ACL_USER_OBJ:
            *permset = (entry->ae_stat.aest_mode >> 6) & 7;
            *type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
            *tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
            entry->acl_state = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
            return (ARCHIVE_OK);
        case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
            *permset = (entry->ae_stat.aest_mode >> 3) & 7;
            *type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
            *tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
            entry->acl_state = ARCHIVE_ENTRY_ACL_OTHER;
            return (ARCHIVE_OK);
        case ARCHIVE_ENTRY_ACL_OTHER:
            *permset = entry->ae_stat.aest_mode & 7;
            *type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
            *tag = ARCHIVE_ENTRY_ACL_OTHER;
            entry->acl_state = -1;
            entry->acl_p = entry->acl_head;
            return (ARCHIVE_OK);
        default:
            break;
        }
    }

    while (entry->acl_p != NULL && (entry->acl_p->type & want_type) == 0)
        entry->acl_p = entry->acl_p->next;
    if (entry->acl_p == NULL) {
        entry->acl_state = 0;
        *type = 0;
        *permset = 0;
        *tag = 0;
        *id = -1;
        *name = NULL;
        return (ARCHIVE_EOF); /* End of ACL entries. */
    }
    *type = entry->acl_p->type;
    *permset = entry->acl_p->permset;
    *tag = entry->acl_p->tag;
    *id = entry->acl_p->id;
    *name = aes_get_mbs(&entry->acl_p->name);
    entry->acl_p = entry->acl_p->next;
    return (ARCHIVE_OK);
}

/*
 * Generate a text version of the ACL.  The flags parameter controls
 * the style of the generated ACL.
 */
const wchar_t *
archive_entry_acl_text_w(struct archive_entry *entry, int flags)
{
    int count;
    size_t length;
    const wchar_t *wname;
    const wchar_t *prefix;
    wchar_t separator;
    struct ae_acl *ap;
    int id;
    wchar_t *wp;

    if (entry->acl_text_w != NULL) {
        free (entry->acl_text_w);
        entry->acl_text_w = NULL;
    }

    separator = L',';
    count = 0;
    length = 0;
    ap = entry->acl_head;
    while (ap != NULL) {
        if ((ap->type & flags) != 0) {
            count++;
            if ((flags & ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT) &&
                (ap->type & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT))
                length += 8; /* "default:" */
            length += 5; /* tag name */
            length += 1; /* colon */
            wname = aes_get_wcs(&ap->name);
            if (wname != NULL)
                length += wcslen(wname);
            else
                length += sizeof(uid_t) * 3 + 1;
            length ++; /* colon */
            length += 3; /* rwx */
            length += 1; /* colon */
            length += max(sizeof(uid_t), sizeof(gid_t)) * 3 + 1;
            length ++; /* newline */
        }
        ap = ap->next;
    }

    if (count > 0 && ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0)) {
        length += 10; /* "user::rwx\n" */
        length += 11; /* "group::rwx\n" */
        length += 11; /* "other::rwx\n" */
    }

    if (count == 0)
        return (NULL);

    /* Now, allocate the string and actually populate it. */
    wp = entry->acl_text_w = (wchar_t *)malloc(length * sizeof(wchar_t));
    if (wp == NULL)
        __archive_errx(1, "No memory to generate the text version of the ACL");
    count = 0;
    if ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
        append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_USER_OBJ, NULL,
            entry->ae_stat.aest_mode & 0700, -1);
        *wp++ = ',';
        append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_GROUP_OBJ, NULL,
            entry->ae_stat.aest_mode & 0070, -1);
        *wp++ = ',';
        append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_OTHER, NULL,
            entry->ae_stat.aest_mode & 0007, -1);
        count += 3;

        ap = entry->acl_head;
        while (ap != NULL) {
            if ((ap->type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
                wname = aes_get_wcs(&ap->name);
                *wp++ = separator;
                if (flags & ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID)
                    id = ap->id;
                else
                    id = -1;
                append_entry_w(&wp, NULL, ap->tag, wname,
                    ap->permset, id);
                count++;
            }
            ap = ap->next;
        }
    }


    if ((flags & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) {
        if (flags & ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT)
            prefix = L"default:";
        else
            prefix = NULL;
        ap = entry->acl_head;
        count = 0;
        while (ap != NULL) {
            if ((ap->type & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) {
                wname = aes_get_wcs(&ap->name);
                if (count > 0)
                    *wp++ = separator;
                if (flags & ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID)
                    id = ap->id;
                else
                    id = -1;
                append_entry_w(&wp, prefix, ap->tag,
                    wname, ap->permset, id);
                count ++;
            }
            ap = ap->next;
        }
    }

    return (entry->acl_text_w);
}

static void
append_id_w(wchar_t **wp, int id)
{
    if (id < 0)
        id = 0;
    if (id > 9)
        append_id_w(wp, id / 10);
    *(*wp)++ = L"0123456789"[id % 10];
}

static void
append_entry_w(wchar_t **wp, const wchar_t *prefix, int tag,
    const wchar_t *wname, int perm, int id)
{
    if (prefix != NULL) {
        wcscpy(*wp, prefix);
        *wp += wcslen(*wp);
    }
    switch (tag) {
    case ARCHIVE_ENTRY_ACL_USER_OBJ:
        wname = NULL;
        id = -1;
        /* FALLTHROUGH */
    case ARCHIVE_ENTRY_ACL_USER:
        wcscpy(*wp, L"user");
        break;
    case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
        wname = NULL;
        id = -1;
        /* FALLTHROUGH */
    case ARCHIVE_ENTRY_ACL_GROUP:
        wcscpy(*wp, L"group");
        break;
    case ARCHIVE_ENTRY_ACL_MASK:
        wcscpy(*wp, L"mask");
        wname = NULL;
        id = -1;
        break;
    case ARCHIVE_ENTRY_ACL_OTHER:
        wcscpy(*wp, L"other");
        wname = NULL;
        id = -1;
        break;
    }
    *wp += wcslen(*wp);
    *(*wp)++ = L':';
    if (wname != NULL) {
        wcscpy(*wp, wname);
        *wp += wcslen(*wp);
    } else if (tag == ARCHIVE_ENTRY_ACL_USER
        || tag == ARCHIVE_ENTRY_ACL_GROUP) {
        append_id_w(wp, id);
        id = -1;
    }
    *(*wp)++ = L':';
    *(*wp)++ = (perm & 0444) ? L'r' : L'-';
    *(*wp)++ = (perm & 0222) ? L'w' : L'-';
    *(*wp)++ = (perm & 0111) ? L'x' : L'-';
    if (id != -1) {
        *(*wp)++ = L':';
        append_id_w(wp, id);
    }
    **wp = L'\0';
}

/*
 * Parse a textual ACL.  This automatically recognizes and supports
 * extensions described above.  The 'type' argument is used to
 * indicate the type that should be used for any entries not
 * explicitly marked as "default:".
 */
int
__archive_entry_acl_parse_w(struct archive_entry *entry,
    const wchar_t *text, int default_type)
{
    struct {
        const wchar_t *start;
        const wchar_t *end;
    } field[4], name;

    int fields;
    int type, tag, permset, id;
    wchar_t sep;

    while (text != NULL  &&  *text != L'\0') {
        /*
         * Parse the fields out of the next entry,
         * advance 'text' to start of next entry.
         */
        fields = 0;
        do {
            const wchar_t *start, *end;
            next_field_w(&text, &start, &end, &sep);
            if (fields < 4) {
                field[fields].start = start;
                field[fields].end = end;
            }
            ++fields;
        } while (sep == L':');

        /* Check for a numeric ID in field 1 or 3. */
        id = -1;
        isint_w(field[1].start, field[1].end, &id);
        /* Field 3 is optional. */
        if (id == -1 && fields > 3)
            isint_w(field[3].start, field[3].end, &id);

        /*
         * Solaris extension:  "defaultuser::rwx" is the
         * default ACL corresponding to "user::rwx", etc.
         */
        if (field[0].end-field[0].start > 7
            && wmemcmp(field[0].start, L"default", 7) == 0) {
            type = ARCHIVE_ENTRY_ACL_TYPE_DEFAULT;
            field[0].start += 7;
        } else
            type = default_type;

        name.start = name.end = NULL;
        if (prefix_w(field[0].start, field[0].end, L"user")) {
            if (!ismode_w(field[2].start, field[2].end, &permset))
                return (ARCHIVE_WARN);
            if (id != -1 || field[1].start < field[1].end) {
                tag = ARCHIVE_ENTRY_ACL_USER;
                name = field[1];
            } else
                tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
        } else if (prefix_w(field[0].start, field[0].end, L"group")) {
            if (!ismode_w(field[2].start, field[2].end, &permset))
                return (ARCHIVE_WARN);
            if (id != -1 || field[1].start < field[1].end) {
                tag = ARCHIVE_ENTRY_ACL_GROUP;
                name = field[1];
            } else
                tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
        } else if (prefix_w(field[0].start, field[0].end, L"other")) {
            if (fields == 2
                && field[1].start < field[1].end
                && ismode_w(field[1].start, field[2].end, &permset)) {
                /* This is Solaris-style "other:rwx" */
            } else if (fields == 3
                && field[1].start == field[1].end
                && field[2].start < field[2].end
                && ismode_w(field[2].start, field[2].end, &permset)) {
                /* This is FreeBSD-style "other::rwx" */
            } else
                return (ARCHIVE_WARN);
            tag = ARCHIVE_ENTRY_ACL_OTHER;
        } else if (prefix_w(field[0].start, field[0].end, L"mask")) {
            if (fields == 2
                && field[1].start < field[1].end
                && ismode_w(field[1].start, field[1].end, &permset)) {
                /* This is Solaris-style "mask:rwx" */
            } else if (fields == 3
                && field[1].start == field[1].end
                && field[2].start < field[2].end
                && ismode_w(field[2].start, field[2].end, &permset)) {
                /* This is FreeBSD-style "mask::rwx" */
            } else
                return (ARCHIVE_WARN);
            tag = ARCHIVE_ENTRY_ACL_MASK;
        } else
            return (ARCHIVE_WARN);

        /* Add entry to the internal list. */
        archive_entry_acl_add_entry_w_len(entry, type, permset,
            tag, id, name.start, name.end - name.start);
    }
    return (ARCHIVE_OK);
}

/*
 * Parse a string to a positive decimal integer.  Returns true if
 * the string is non-empty and consists only of decimal digits,
 * false otherwise.
 */
static int
isint_w(const wchar_t *start, const wchar_t *end, int *result)
{
    int n = 0;
    if (start >= end)
        return (0);
    while (start < end) {
        if (*start < '0' || *start > '9')
            return (0);
        if (n > (INT_MAX / 10))
            n = INT_MAX;
        else {
            n *= 10;
            n += *start - '0';
        }
        start++;
    }
    *result = n;
    return (1);
}

/*
 * Parse a string as a mode field.  Returns true if
 * the string is non-empty and consists only of mode characters,
 * false otherwise.
 */
static int
ismode_w(const wchar_t *start, const wchar_t *end, int *permset)
{
    const wchar_t *p;

    p = start;
    *permset = 0;
    while (p < end) {
        switch (*p++) {
        case 'r': case 'R':
            *permset |= ARCHIVE_ENTRY_ACL_READ;
            break;
        case 'w': case 'W':
            *permset |= ARCHIVE_ENTRY_ACL_WRITE;
            break;
        case 'x': case 'X':
            *permset |= ARCHIVE_ENTRY_ACL_EXECUTE;
            break;
        case '-':
            break;
        default:
            return (0);
        }
    }
    return (1);
}

/*
 * Match "[:whitespace:]*(.*)[:whitespace:]*[:,\n]".  *wp is updated
 * to point to just after the separator.  *start points to the first
 * character of the matched text and *end just after the last
 * character of the matched identifier.  In particular *end - *start
 * is the length of the field body, not including leading or trailing
 * whitespace.
 */
static void
next_field_w(const wchar_t **wp, const wchar_t **start,
    const wchar_t **end, wchar_t *sep)
{
    /* Skip leading whitespace to find start of field. */
    while (**wp == L' ' || **wp == L'\t' || **wp == L'\n') {
        (*wp)++;
    }
    *start = *wp;

    /* Scan for the separator. */
    while (**wp != L'\0' && **wp != L',' && **wp != L':' &&
        **wp != L'\n') {
        (*wp)++;
    }
    *sep = **wp;

    /* Trim trailing whitespace to locate end of field. */
    *end = *wp - 1;
    while (**end == L' ' || **end == L'\t' || **end == L'\n') {
        (*end)--;
    }
    (*end)++;

    /* Adjust scanner location. */
    if (**wp != L'\0')
        (*wp)++;
}

/*
 * Return true if the characters [start...end) are a prefix of 'test'.
 * This makes it easy to handle the obvious abbreviations: 'u' for 'user', etc.
 */
static int
prefix_w(const wchar_t *start, const wchar_t *end, const wchar_t *test)
{
    if (start == end)
        return (0);

    if (*start++ != *test++)
        return (0);

    while (start < end  &&  *start++ == *test++)
        ;

    if (start < end)
        return (0);

    return (1);
}


/*
 * Following code is modified from UC Berkeley sources, and
 * is subject to the following copyright notice.
 */

/*-
 * Copyright (c) 1993
 *  The Regents of the University of California.  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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

static struct flag {
    const char  *name;
    const wchar_t   *wname;
    unsigned long    set;
    unsigned long    clear;
} flags[] = {
    /* Preferred (shorter) names per flag first, all prefixed by "no" */
#ifdef SF_APPEND
    { "nosappnd",   L"nosappnd",        SF_APPEND,  0 },
    { "nosappend",  L"nosappend",       SF_APPEND,  0 },
#endif
#ifdef  EXT2_APPEND_FL              /* 'a' */
    { "nosappnd",   L"nosappnd",        EXT2_APPEND_FL, 0 },
    { "nosappend",  L"nosappend",       EXT2_APPEND_FL, 0 },
#endif
#ifdef SF_ARCHIVED
    { "noarch", L"noarch",      SF_ARCHIVED,    0 },
    { "noarchived", L"noarchived",          SF_ARCHIVED,    0 },
#endif
#ifdef SF_IMMUTABLE
    { "noschg", L"noschg",      SF_IMMUTABLE,   0 },
    { "noschange",  L"noschange",       SF_IMMUTABLE,   0 },
    { "nosimmutable",   L"nosimmutable",    SF_IMMUTABLE,   0 },
#endif
#ifdef EXT2_IMMUTABLE_FL            /* 'i' */
    { "noschg", L"noschg",      EXT2_IMMUTABLE_FL,  0 },
    { "noschange",  L"noschange",       EXT2_IMMUTABLE_FL,  0 },
    { "nosimmutable",   L"nosimmutable",    EXT2_IMMUTABLE_FL,  0 },
#endif
#ifdef SF_NOUNLINK
    { "nosunlnk",   L"nosunlnk",        SF_NOUNLINK,    0 },
    { "nosunlink",  L"nosunlink",       SF_NOUNLINK,    0 },
#endif
#ifdef SF_SNAPSHOT
    { "nosnapshot", L"nosnapshot",  SF_SNAPSHOT,    0 },
#endif
#ifdef UF_APPEND
    { "nouappnd",   L"nouappnd",        UF_APPEND,  0 },
    { "nouappend",  L"nouappend",       UF_APPEND,  0 },
#endif
#ifdef UF_IMMUTABLE
    { "nouchg", L"nouchg",      UF_IMMUTABLE,   0 },
    { "nouchange",  L"nouchange",       UF_IMMUTABLE,   0 },
    { "nouimmutable",   L"nouimmutable",    UF_IMMUTABLE,   0 },
#endif
#ifdef UF_NODUMP
    { "nodump", L"nodump",      0,      UF_NODUMP},
#endif
#ifdef EXT2_NODUMP_FL               /* 'd' */
    { "nodump", L"nodump",      0,      EXT2_NODUMP_FL},
#endif
#ifdef UF_OPAQUE
    { "noopaque",   L"noopaque",        UF_OPAQUE,  0 },
#endif
#ifdef UF_NOUNLINK
    { "nouunlnk",   L"nouunlnk",        UF_NOUNLINK,    0 },
    { "nouunlink",  L"nouunlink",       UF_NOUNLINK,    0 },
#endif
#ifdef EXT2_COMPR_FL                /* 'c' */
        { "nocompress", L"nocompress",          EXT2_COMPR_FL,  0 },
#endif

#ifdef EXT2_NOATIME_FL              /* 'A' */
        { "noatime",    L"noatime",     0,      EXT2_NOATIME_FL},
#endif
    { NULL,     NULL,           0,      0 }
};

/*
 * fflagstostr --
 *  Convert file flags to a comma-separated string.  If no flags
 *  are set, return the empty string.
 */
static char *
ae_fflagstostr(unsigned long bitset, unsigned long bitclear)
{
    char *string, *dp;
    const char *sp;
    unsigned long bits;
    struct flag *flag;
    size_t  length;

    bits = bitset | bitclear;
    length = 0;
    for (flag = flags; flag->name != NULL; flag++)
        if (bits & (flag->set | flag->clear)) {
            length += strlen(flag->name) + 1;
            bits &= ~(flag->set | flag->clear);
        }

    if (length == 0)
        return (NULL);
    string = (char *)malloc(length);
    if (string == NULL)
        return (NULL);

    dp = string;
    for (flag = flags; flag->name != NULL; flag++) {
        if (bitset & flag->set || bitclear & flag->clear) {
            sp = flag->name + 2;
        } else if (bitset & flag->clear  ||  bitclear & flag->set) {
            sp = flag->name;
        } else
            continue;
        bitset &= ~(flag->set | flag->clear);
        bitclear &= ~(flag->set | flag->clear);
        if (dp > string)
            *dp++ = ',';
        while ((*dp++ = *sp++) != '\0')
            ;
        dp--;
    }

    *dp = '\0';
    return (string);
}

/*
 * strtofflags --
 *  Take string of arguments and return file flags.  This
 *  version works a little differently than strtofflags(3).
 *  In particular, it always tests every token, skipping any
 *  unrecognized tokens.  It returns a pointer to the first
 *  unrecognized token, or NULL if every token was recognized.
 *  This version is also const-correct and does not modify the
 *  provided string.
 */
static const char *
ae_strtofflags(const char *s, unsigned long *setp, unsigned long *clrp)
{
    const char *start, *end;
    struct flag *flag;
    unsigned long set, clear;
    const char *failed;

    set = clear = 0;
    start = s;
    failed = NULL;
    /* Find start of first token. */
    while (*start == '\t'  ||  *start == ' '  ||  *start == ',')
        start++;
    while (*start != '\0') {
        /* Locate end of token. */
        end = start;
        while (*end != '\0'  &&  *end != '\t'  &&
            *end != ' '  &&  *end != ',')
            end++;
        for (flag = flags; flag->name != NULL; flag++) {
            if (memcmp(start, flag->name, end - start) == 0) {
                /* Matched "noXXXX", so reverse the sense. */
                clear |= flag->set;
                set |= flag->clear;
                break;
            } else if (memcmp(start, flag->name + 2, end - start)
                == 0) {
                /* Matched "XXXX", so don't reverse. */
                set |= flag->set;
                clear |= flag->clear;
                break;
            }
        }
        /* Ignore unknown flag names. */
        if (flag->name == NULL  &&  failed == NULL)
            failed = start;

        /* Find start of next token. */
        start = end;
        while (*start == '\t'  ||  *start == ' '  ||  *start == ',')
            start++;

    }

    if (setp)
        *setp = set;
    if (clrp)
        *clrp = clear;

    /* Return location of first failure. */
    return (failed);
}

/*
 * wcstofflags --
 *  Take string of arguments and return file flags.  This
 *  version works a little differently than strtofflags(3).
 *  In particular, it always tests every token, skipping any
 *  unrecognized tokens.  It returns a pointer to the first
 *  unrecognized token, or NULL if every token was recognized.
 *  This version is also const-correct and does not modify the
 *  provided string.
 */
static const wchar_t *
ae_wcstofflags(const wchar_t *s, unsigned long *setp, unsigned long *clrp)
{
    const wchar_t *start, *end;
    struct flag *flag;
    unsigned long set, clear;
    const wchar_t *failed;

    set = clear = 0;
    start = s;
    failed = NULL;
    /* Find start of first token. */
    while (*start == L'\t'  ||  *start == L' '  ||  *start == L',')
        start++;
    while (*start != L'\0') {
        /* Locate end of token. */
        end = start;
        while (*end != L'\0'  &&  *end != L'\t'  &&
            *end != L' '  &&  *end != L',')
            end++;
        for (flag = flags; flag->wname != NULL; flag++) {
            if (wmemcmp(start, flag->wname, end - start) == 0) {
                /* Matched "noXXXX", so reverse the sense. */
                clear |= flag->set;
                set |= flag->clear;
                break;
            } else if (wmemcmp(start, flag->wname + 2, end - start)
                == 0) {
                /* Matched "XXXX", so don't reverse. */
                set |= flag->set;
                clear |= flag->clear;
                break;
            }
        }
        /* Ignore unknown flag names. */
        if (flag->wname == NULL  &&  failed == NULL)
            failed = start;

        /* Find start of next token. */
        start = end;
        while (*start == L'\t'  ||  *start == L' '  ||  *start == L',')
            start++;

    }

    if (setp)
        *setp = set;
    if (clrp)
        *clrp = clear;

    /* Return location of first failure. */
    return (failed);
}


#ifdef TEST
#include <stdio.h>
int
main(int argc, char **argv)
{
    struct archive_entry *entry = archive_entry_new();
    unsigned long set, clear;
    const wchar_t *remainder;

    remainder = archive_entry_copy_fflags_text_w(entry, L"nosappnd dump archive,,,,,,,");
    archive_entry_fflags(entry, &set, &clear);

    wprintf(L"set=0x%lX clear=0x%lX remainder='%ls'\n", set, clear, remainder);

    wprintf(L"new flags='%s'\n", archive_entry_fflags_text(entry));
    return (0);
}
#endif
